200837542 九、發明說明： 【發明所屬之枝術領域】 發明領域 本發明涉及傳導電子部件的熱的散熱器、散熱器風扇 5以及散熱為的製造方法。4寺別是本發明涉及對包括Mpu的 電子部件等被冷卻物進行冷卻的散熱器。本申請與下述的 日本申請相關。關於承認因文獻參照而進行編入的指定 國’通過參照來將在下述的申請中記載的内容編入到本申 請中，並將其作爲本申請的一部分。 10 1·曰本特開2007_〇〇549〇申請曰2007年1月15曰 2.日本特開2007-083091申請日2007年3月27曰 發明背景 近年來，MPU(Micro Processing Unit ··微處理器）的高 15 時鐘化明顯，對應於高時鐘化，MPU自身的發熱也有一路 增大的趨勢，但是由於存在因該發熱而導致MPU出現誤動 作的可能性，所以MPU的冷卻問題極其重要。在MPU等發 熱的電子部件上安裝有散熱器風扇（heat sink fan)，該散熱 器風扇是將用多個散熱用翅片構成的金屬製的散熱片和向 20 该散熱片供給冷卻風的冷卻風扇組合而成的，儘管如此， 還是要求提高散熱器風扇的冷卻效率以及從MPU向散熱片 的熱傳導效率。 另一方面，以個人電腦爲代表的包括MPU的電子設備 要求成本的降低。因此，並不只是需要冷卻特性高，而且 5 200837542 需要製造成本低的散熱片。 爲了提向散熱片的冷卻效率，一般要擴大散熱片整體 的表面積。爲了擴大表面積，可以將散熱翅片的周向的厚 度形成得較薄’使各散熱翅片以從基部朝向徑向外側呈放 5射狀地延伸的方式形成。但是，如果使得散熱翅片較薄， 則散熱片的強度會下降，因此在使散熱翅片變薄的方面存 在極限。另外’在延伸的多個散熱翅片的基部的根部附近， 如果散熱翅片之間的間隙太過狹窄，則供給到散熱片的冷 部風就不會順利地通過散熱翅片之間。因此，如果單純地 10擴大散熱片的表面積，冷卻效率並不會提高。 爲了提而散熱片的冷卻特性，需要將散熱片構成爲： 在熱從作爲發熱源的MPU向散熱翅片傳遞的過程中傳遞損 失小例如在專利文獻1中，公開了這樣一種散熱片：具 有基座，錢座由在内部具有空腔的圓筒形的中空部、和 15配口在二脸内並配置成可相對於中空部進行熱傳導的高熱 傳導率體構成。在該基座的外周部形成有散熱翅片，高熱 傳&率組由熱傳導率比散熱翅片以及中空部的材質（銘）還 南的銅形成。 另外爲了在散熱片中得到高的冷卻特性，優選提高 2〇散熱#MPU的接觸面處的接觸壓力。這是因爲如果提高 接觸壓力，則能夠減小在散熱片與MPU之間産生的接觸熱 电!1的值在口亥情況下，爲了提高散熱片和碰U的接觸壓 力，需要將散熱片妥善地固定在MPU上。 例如在專利文獻2中，公開了如下方法：在基座的怒 6 200837542 的外周側面上形成凹口’將支樓件(安裝部件）以形成在該支 撐件上的開孔與凹Π卡合的料^在散⑼上。另外， 除了上述專利文獻2所公開的方法之外，還知道有將安裝部 件夾在散熱片和芯之間進行固定的方法。 專利文獻1:日本特開2005-327854 專利文獻2:日本特開2〇〇6_32941 但是，作爲同一部件來說，雖然熱傳導率依賴於其部 件的物理參數來確定，但是，如果接觸不同的部件，則接 觸熱電阻的值依賴於接觸面的狀況而變大，導致熱傳導率 下p牛如專利文獻1中所示的結構那樣，當在中空部的空腔 内配合有高熱傳導率體的情況下，會在空腔和高熱傳導率 的接觸面上産生接觸熱電阻。 另外’在專利文獻1記載的散熱片中，由於銅比鋁的比 重大，所以高熱傳導率體占散熱片的體積越大，熱傳導率 15越咼，但是散熱片的質量也變大。另外，銅與鋁相比可獲 得性差，作爲材料的成本也高。 再者，在專利文獻1記載的結構中，産生使高熱傳導率 體配合在令空部的空腔内的工時。更加具體來說，需要以 如下方法來構成散熱片：在基部的中心形成以中心軸爲中 20心的通孔，將圓柱狀的芯壓入到該通孔中。在這種情況下， 爲了降低在芯的側面與通孔之間的接觸面上産生的接觸熱 電阻的值’優選以接觸壓力高的方式進行壓入固定。爲此， 通過熱壓配合進行壓入固定，所謂的熱壓配合是將基部加 熱到面溫’在基部的通孔的内徑膨脹的過程中，相對於通 7 200837542 孔將芯插入，然後使基部冷卻。值是，若利用這樣的現有 的方法，不僅需要大量的工時，而且要對散熱片進行加熱 或者冷卻，會産生大幅度的溫度變化，所以可能導致散熱 片本身的強度降低。另外，在散熱片的使用溫度範圍比設 5想的溫度還高的情況下，由於散熱片上產生的熱膨脹，有 可能導致芯脫落。 這樣，在上述專利文獻1所公開的結構中，在考慮到可 獲得性，成本，可靠性和生産效率的情況下，存在著問題。 10 15 另外，如上所述，爲了提高散熱片的冷卻特性，需要 相對於聊牢固地安裝散熱片，但是在專利文獻2所示的固 定方法中，—顧過形成在切件_孔㈣突出部與 凹口的配合來進行岐，因此以散熱片的中心軸爲中心的 轉動強度低。另外，根據凹π以及支撐件的加工精度，在 凹口與支撐件之間，在以中叫爲㈣的軸向上有可能產 生遊隙。即，通過專敎獻2所公開_定方法無法獲得高 的可靠性。 另外’在除了專社獻2所公開的方法料的現有的方 法中，會產生大量的安裝功。正在尋求生産工時少、而 且施夠獲得高的固定強度的固定方法。 C考务明内容】 發明概要 因此，本發明的目的在於提供能夠解決上述課題的散 ，器、風W散熱器的製造方法。該目的通”請專利 範圍的獨立項所記載的特徵的組合來達成。另外，從屬申 200837542 清專利範圍限定了本發明的更爲有利的具體示例。 /了解決上述課題，在第一方式中，提供-種散熱器， 其是傳導電子部件的熱的散熱器，其特徵在於，所述散熱 器具有：基部，該基部具有一個平面，並且是相對於該平 5面實質上垂直地延伸的柱狀的基部，通過該平面限定的區 域在與該平面大致垂直的方向上形成爲實心；以及多個翅 片邛，匕們從基部的内側朝向外側延伸，基部和多個翅片 部用相同的材料一體地形成。 基邛可以由多個柱狀件構成，所述多個柱狀件在相對 10於平面大致垂直的方向上延伸。在從相對於平面大致垂直 的方向進行觀察的情況下，基部可以具有大致對稱的形狀。 在從相對於平面垂直的方向進行觀察的情況下，基部 可以形成爲大致圓形，並且多個翅片部沿著以基部的中心 軸爲中心的周向排列，所述基部的中心軸通過大致圓形的 15大致中心。多個翅片部也可以分別在相對於平面大致垂直 的方向上延伸。另外，多個翅片部也可以分別相對於與平 面垂直的方向具有角度地延伸。 基部也可以由多個柱狀件構成，所述多個柱狀件沿著 中心軸延伸，多個柱狀件中的一個是包括中心軸的大致圓 20 柱狀的中心件，多個柱狀件的至少另一個配置在中心件的 周圍，並且與多個翅片部的一端連續地形成。 政熱也可以具有安裝部件’該安裝部件在中心具有 通孔’並且具有朝向該中心的徑向外侧延伸的多個安裝 腳’在從與平面平行的方向進行觀察的情況下，該平面構 200837542 成突出部的上表面，該突出部設置成比多個翅片部向與該 平面垂直的方向突出，該上表面具有與電子料接觸的接 觸部，突出部的相側面配合在安裝部件的通孔中。 5 10 20 突出部的外周端也可以具有朝向徑向外側發生了變形 的多個部位。接觸部的接觸面處的相端也可以在整周上 具有朝向所述徑向相發生了變形的部位。在形成於安裝 部件的通孔的内周面上可以形成有至少—個凹口。 在第一方式中提供一種用於如上所述的散熱器的散熱 器風扇’其具有冷卻風扇，該冷卻風扇隔著基部配置在平 面的相反側’用於對散熱H輸送冷卻㈣空氣流，所述冷 卻風扇具有·葉輪，其具有通過以中心軸爲中心旋轉來在 抽向上産生空氣流的多個葉片；電動機部，其旋轉驅動葉 ^ /、具有從葉輪的外側包圍葉輪的風洞部，並 支樓電動機部。這種情況下，冷卻風扇可m置成：葉輪 的所述中心軸、和散熱器具備的基部的中心、軸大致一致。 在第三方式Φ，# Μ r 徒供一種模具，該模具是用於通過擠 s或者減达料來進行成形的具有多個翅ϋ的散熱器的模 艮’该板具具有第_模具部和第二模1部，所述第一模具 印具有1放人轉的第-開口部，料料的第二開口部； 没置在第-開口部和第二開π部之間、並具有内壁面的第 -链料通過4 ’和連接該迷料通過部的内壁面的一部分和 -面的Ρ部分的分割H模具部與t模具部相 U其具有·放入迷料的第三開口部；排出述料的第 3開口口ρ ’ σ又置在第三開口部和第四開口部之間、並具有 10 200837542 内壁面的第二坯料通過部；和設置在第二坯料通過部的内 壁面的至少一部分上的多個翅片部形成槽。 第一模具部和第二模具部既可以分體地形成，也可以 一體地形成。 5 在朝向坯料被擠出或者被拉拔的方向觀察第二開口部 的情況下，第一坯料通過部的内壁面以及分割部可以構成 爲大致對稱形狀的多個孔。分割部也可以具有大致圓形 孔，和以包圍該圓形的孔的方式配置的多個大致扇形孔。 大致扇形可以是具有60度的内角的扇形的至少一部分的形 10 狀。 翅片部形成槽可以沿著從第四開口部朝向第三開口部 的方向延伸，並且在第二坯料通過部的内壁面的周上隔開 大致相等間隔地設置有多個。在朝向迷料被擠出或者被拉 拔的方向觀察第四開口部的情況下，多個翅片部形成槽可 15 以沿著以通過該開口部的大致中心的中心軸爲中心的周向 進行排列。另外，翅片部形成槽也可以還具有多個小槽。 在第三方式中，提供一種散熱器的製造方法，其是對 電子部件進行冷卻的散熱器的製造方法，所述散熱器的製 造方法包括·（a)在爐中對散熱裔的述料進行加熱的程序， 20 (b)將坯料從第一模具中呈實心而且是柱狀地擠壓出的程 序，和（c)切斷所擠壓出的述料的程序。在程序(b)之前可以 還包括將坯料從第二模具擠出將其分割爲多個柱狀件的程 序(a-2)，在程序(b)中將所分割成的多個柱狀件從第一模具 中擠壓出來。 11 200837542 序（a)還可以包括將坯料的溫度調整爲預定溫度的程 序斤明預定溫度可以是述料的炼點的％%以下。在程序 ()中可以準備銘系材料作爲枉料，預定溫度爲_。〇以下。 所述散熱器的製造方法還可以包括對使用第二模具分 J成的夕個4主狀件的溫度進行調整的程序。被調整的多 個柱狀件的溫度可以是堪料炼點的9〇%以下。或者，被調 整的多個柱狀件的溫度可以是6〇(TC以下。 在私序(b)中可以具有調整第一模具的溫度的程序。這 種情況下，可以具有將第—模具的溫度調整脚(TC以下的 f序另卜可以將第一模具的溫度調整成比程序⑻中的 述料的溫度要高。 在使用第二模具將述料分割成多個柱狀件的程序中， 可以具有調整第二模具的溫度的程序。這種情況下，可以 具有將弟二模具的溫度調整爲_°C以下的程序。可以將第 15二模㈣溫度調整成比程序(a)中的㈣的溫度要高。 在序(b)中可以具有對擠壓述料的速度進行調整的程 序。播壓述料的速度可以根據經過加熱的迷料的溫度、組 成以及黏度中的至少一方來確定。擠壓达料的速度可以至 少根據第-模具的形狀以及溫度中的一方來確定。擠壓链 20料的速度可以至少根據第二模具的形狀以及溫度中的一方 來確定。 一在所杜序(a-2)中’可以在將轉全部從第二模具擠 出前，將利用第二模具分割而成的多個柱狀件從第一模且 帽出。或者在程序㈣中，可以在將枉料全部從第二模 12 200837542 具擠出後，將利用第二模I八 模具中擠出， 、、刀』而成的多個柱狀件從第一 在，)中將趣料從第二模具擠塵出的速度，可以 1程序(b)中制用第二模具分割而成❹個柱狀件從第 一模具擠壓出的速度不同。弟 序：將從第二模具__/^ 的程 、 、夕個柱狀件，通過從第三模且 中擠壓出來，來進一步進行分割。 〃、 10 15 第方式中提供-種散熱器的製造方法，其是對 電子部件進行冷㈣散_的製造方法，所述散熱器的製 造方法包括：⑷準備實心柱狀的述料的程序；⑼在爐中對 ^料進行加熱的程序；⑷將㈣塵入到分割用模具中，將 料刀』成夕個柱狀件的程序；⑷將分割而成的多個柱狀 件屋入到散熱片模具巾，在使多條狀件彼此接合的同 時’將其從散熱片模具中擠壓出來的程序；和⑷將從散熱 片模具賴出來並彼此接合的多個柱狀件靖的程序。 在(C)程序中，可以將坯料鋼坯分割成：形成基部的中 心部的中心部材料；和包圍該中心部材料的外側部的周向 的多個散熱翅片部材料。 20 工 在程序⑷中，可以具有這樣的程序：將散熱片切削加 成在被切fe/f的散熱片的任一側的軸向端面上留有以中心 軸爲中心的柱狀的被冷卻物接觸部，並且還具有以下程 序·⑴將在中心具有通孔的安裝部件以使被冷卻物接觸部 的外周側面與通孔配合的方式插入的程序，其中在所述安 裝部件上朝向徑向外側呈放射狀地延伸有多個安裝腳；和 13 200837542 5 (g)通過對被冷卻物接觸部的接觸面處的外周端的多個部位 或者整周進行㈣，使被冷料接觸料接觸面處的外周 端的多個部位或者㈣朝向•外倒産生龍變形，從而 相對於被冷卻物接觸部料周側面固定安裝部件的程序。 ⑻知序之别可以具有沿著被冷卻物接觸部的接觸面 =端形成槽的程序，（g)程序中，對比被冷卻 的 10 壓 槽罪外側的部位進行城。或者，⑻程序前可較有 ，卻物接觸部的接觸面的外周端形成向散熱片二= =梯部的㈣，在(g)程料龍冷卻物賴，階梯部加 而製成的 在第方式中，提供一種通過上述製造方法 散熱器。 圖式簡單說明 第1圖是表示本發明的實施方式涉及的散熱片丨 圖。 v儿歷 圖弟2圖是表示本發明的實施方式涉及的散熱片2的立體 第3圖是對散熱片2的形成和模具—起進行表 圖。 ^儿艘 第4圖是表示到形成散熱片2爲止的流程的圖。 第5圖是表示被冷卻物接觸部的切削過程的—部 立體圖。 刀的 第6圖是表示被冷卻物接觸部的切削過程的一部分的 立體圖。 14 200837542 第7圖是表示將安裝部件固定在散熱片上的過程的立 體圖。 弟8圖是表不固定有安裝部件的散熱片的立體圖。 第9圖是表示安裝部件的立體圖。 5 第10圖是表示MPU和散熱片的接觸的狀況的平面圖。 第11圖是表示在散熱片的上部安裝有冷卻風扇的散熱 器風扇的立體圖。 第12圖是表示到形成其他的散熱片爲止的流程的圖。 第13圖是表示其他散熱片的被冷卻物接觸部的切削過 10 程的一部分的立體圖。 弟14圖是表不固定有安裝部件的其他散熱片的立體 圖。 第15圖是表示固定有安裝部件的散熱片的立體圖。 第16圖是用於說明分割模具7的詳細情況的圖。 15 第17圖是用於說明散熱片模具的詳細情況的圖。 第18圖是表示散熱片的分割部的形狀的圖。 第19圖是表示分割部的其他示例的圖。 第20圖是表示分割部的又一示例的圖。 第21圖是說明使用了多個分割模具的情況下的示例的 20 圖。 I：實施方式3 較佳實施例之詳細說明 下面，參照第1至21圖對本實施方式涉及的散熱器、其 製造方法以及散熱器風扇進行說明。此外，下文中散熱片 15 200837542 是散熱器的一個示例。另外，在本申請中，爲了方便將各 圖的上下方向作爲“上下方向”，但是並不對實際安裝狀態 下的方向進行限定。 第1圖是表示本發明的實施方式涉及的散熱片1的一個 5 示例的立體圖。第2圖是表示本發明的實施方式涉及的散熱 片2的一個示例的立體圖。 散熱片1是通過對铭糸材料等熱傳導性較南的材料利 用擠壓(拉拔)加工進行成形而形成的散熱器。在本實施方式 中，在對散熱片1進行成形時，也可以使用鋁或者鋁合金。 10 散熱片1具有柱狀的基部11、和從基部11的内側朝向外側延 伸的多個散熱用翅片部12。柱狀的基部11具有接觸面131， 基部11實質上相對於該接觸面131垂直地延伸。在從相對於 接觸面131垂直的方向進行觀察的情況下，基部11形成爲大 致圓形，通過接觸面131限定的區域在與該接觸面131大致 15 垂直的方向上形成爲實心。即，如第1圖所示，基部11是以 中心轴爲中心的圓柱狀，並且形成爲實心結構。此外，接 觸面131是記載在申請專利範圍中的平面的一個示例。 通常，散熱片1形成爲與外部空氣的接觸面積、即散熱 片1的表面積較大。在本示例中，多個散熱用翅片部12沿著 20 以基部11的中心轴爲中心的周向排列，所述基部的中心軸 通過大致圓形的大致中心。即，多個散熱用翅片部12從圓 柱狀的基部11的圓柱外侧面朝向徑向外側突出設置，多個 散熱用翅片部12與基部11連續地形成爲一體。由此，散熱 片1將電子部件的熱從基部11充分地傳導至散熱用翅片部 16 200837542 12。在本示例中，如第1圖所示’相對於基部u呈放射狀延 伸的多個散熱用翅片部12沿著基部丨丨的外周呈環狀排列。 尤其是爲了增大表面積，散熱用翅片部12可相對於排列方 向彎曲地形成。通過使散熱用翅片部12彎曲，散熱用翅片 5部12的表面積會增加。此外，用於增大散熱片1的表面積的 政熱用翅片部12的形狀並不限定於此，可以適當改變形狀。 基部11與多個散熱用翅片部12通過相同的材料形成。 在本不例中，基部11和散熱用翅片部12利用鋁合金形成。 這樣，在本示例中，散熱用翅片部12和基部u連續地 10形成，而且基部11形成爲實心結構，所以，在從接觸面131 到散熱用翅片部12之間，在内部不會産生接觸熱電阻。因 此’能夠使熱電阻的損失停留在最小限度，並且能夠提高 散熱片的冷卻效率。另外，不像以往那樣通過熱壓配合^ 行壓入固定，就能夠得到接觸熱電阻的值小的散熱片。 15 另外般來說’由於㈣材料比銅系材料硬，所以 使用了更加複雜的模具的擠壓（拉拔)加工中的精加工的尺 寸精度高。與此相對，如果是銅系材料，形狀複_㈣ 播壓(拉拔)加卫進行的成形非常困難，精加卫的尺寸精度極 差。因此’使用銅系材料通過利用擠壓(拉拔)加工進行的成 20形來形成複雜形狀的散熱片是非常困難的。與此相對，在 本示例中，由於散熱用翅片部12和基部叫是使用鋼製材 料，而是使用铭合金製材料，所以即使是複雜的形狀 能夠恰當地形成散熱片。 在第2圖中，表示在第1圖中所示的散熱片1的變形示 17 200837542 例。第2圖中所示的散熱片2中的基部w多個检狀件構 成，所述多個柱狀件在相對於接觸面131垂直的方向上延 伸。中心部材料61〇是多個柱狀件的—個，其是包括;心轴 的大致圓柱狀的中心件。散熱翅片部材料62〇配置在中心部 5材料610的周圍，並與多個散熱用翅片部_一端連續地形 成。此外，在使用本申請的發明所涉及的分割模具來形成 散熱片2的情況τ，製造出如第所示的散熱片，對此， 將在後面進行詳細敍述。 下面，對散熱片的擠壓（拉拔)加工的成形方法進行詳細 10敍述。第3圖是表示模具的流程的立體圖，所述模具的流程 是表示到散熱片2形成爲止的流程。第4圖是說明到散熱片2 形成爲止的流程的圖。 作爲散熱片1、2所使用的鋁合金，主要使用6〇〇〇系 Al-Mg-Si系或者1000系純A1。其中，經常使用6〇〇〇系 15 A1-Mg_Si系中的6063。6063具有優良的擠壓性，以建築用 的窗框爲中心，尤其作爲不要求高強度的結構構件進行使 用。由於散熱片1、2不要求建築用的結構構件那樣的高強 度，所以6063最爲常用。在以熱傳導性最爲優先的情況下， 使用1000系純A1中的1060、1070。 20 首先，準備鋁合金製的圓柱形狀的鋼坯6(在軋製加工 等中使用的金屬塊）。接著，將鋼坯6在爐中加熱至大約 500 C(步驟S1)。在爐中進行了加熱的鋼述6與常溫狀態相比 有所軟化。在該狀態下，鋼坯6被壓入第3A圖所示的分割用 模具7中。分割用模具7加工爲如下形狀：在壓入了鋼坯6 18 200837542 時，鋼坯6被分割成7份(步驟S2)。 在本實施例中，鋼坯6被分割用模具7分割成7份，但 是，進行分割的分割數並不限定於7。，分割數可根據散 熱片的形狀以及大小而適當地變更。壓入到本例的分割用 5模具7中的鋼趣6，被分割成多個(7個)柱狀的分割材料61、 62。如第3B圖所示，分割材料61是構成鋼述㈣中心部的部 位被分割用模具7分割而成的材料。多個分割材料以以包圍 分割材料61的周圍的方式被分割。 接著，分割材料61、62被壓入到散熱片模具8中（步驟 10 S3)。政熱片杈具8被加工成如下形狀：在擠壓出分割材料 61、62時，如第3C圖所示，加工成基部丨丨排列有多個散熱 用翅片部12的形狀。分割材料61、62在被壓入到散熱片模 具8中的時候，彼此接觸並接合。即，通過該施工方法加工 而成的散熱片2以這樣的狀態形成：鋼链6被分割，散熱翅 15片部材料620圍繞中心部材料610排列，並且彼此接合。 在本實施方式的散熱片的擠壓(拉拔)加工中，主要使用 直接法。所謂的直接法就是朝向擠壓方向直接擠壓述料的 方法。詳細地說，所謂的直接法就是這樣的方法：將加熱 後的鋼坯插入到配置有擠壓模具的容器中，在模具方向上 20對鋼坯進行壓縮。被壓縮後的鋼坯通過模具被擠壓成預定 的模型。在直接法中，擠壓時，在該鋼坯和容器之間産生 摩擦。這種情況下，當通過模具時的壓力因部位不同而不 同時，存在金屬流動（金屬組織的流動）變得不均勻的情況。 更加具體地說，當在散熱片模具8中擠壓坯料時，形成散熱 19 200837542 1翅片部12的部位與形成基部11的部位相比，述料通過的 抓暹狹窄。因此，在進行了擠壓（拉拔)加工的情況下，在鋼 玉6中在與散熱用翅片部12相當的鋼坯6内產生的壓力比 鋼达6的中心觸近還高，⑦料變得難以流動。因此，在不 使用刀用模具7的情況下，鋼埋的金屬流動變得不均勻， 存在無法進行高精度的擠壓(拉拔)加工的情況。 二但是，通過使用分割用模具7，在壓入到散熱片模具8 之前，鋼埋6被分割爲分割材料61、62。由此，娜6的金 屬流動被截斷，各分割材料6卜62的金屬流動的不均句度 降低。由此，即使散熱用翅片部12的形狀複雜，也能夠恰 當地形成散熱片2。特別是通過在基部u的中心部配置中心 部材料610，能夠減小在散熱用翅片部12和基部⑽一部分 (標號610)之間形成的厚度，所以加工變得更加容易。 擠壓（拉拔）加工完成後的散熱片2被精加工成與鋼场6 15樣在軸向上長的長條狀的散熱片2。在播壓出來的時刻， 散熱片2由於高溫而較軟。因此，散熱片2本身是處於容易 扭曲的狀態，其中也存在扭曲了的散熱片2。因此，通過對 散熱片1的兩端相互進行拉伸，來矯正散熱片2的扭曲使之 爲筆直的狀態並進行冷卻。通過該作業，來使散熱片2的尺 20 寸的表現出高精度。 擠壓(拉拔)加工後的散熱片2是長條狀的。因此，將散 熱片2在軸向上以垂直的面切斷（步驟以）。 此外，在本示例中，雖然將鋼坯6的溫度設定爲大約 500。〇，但是也可以根據擠壓（拉拔）的速度以及鋼坯的組成 20 200837542 來適田地σ又疋鋼坯的溫度。例如，也可以將溫度設定在坯 料的溶點的90%以下。在雀呂系材料的情況下，鋼紛的溫度 可以設定在大約4〇〇。〇以上、且在大約6〇〇t：以下。另外， 可X通過凋整为吾j模具7和散熱片模具8的溫度，來調整 5 鋼坯6的溫度。 另外在上述私序中還可以包括這樣的階段：對使用 2割模具7分割而成的多個分割材料61、62的溫度進行調 ^這種h況下，多個分割材料61、62的溫度可以在坯料 的少谷點的大約90%以下。在铭系的材料的情況下 ，也可以 將分割材料6卜62的溫度設定在大約4Q(n：以上，且在大約 6〇〇°C以下。 或者，在上述程序中，也可以具有分別對分割模具7 和散熱片模具8的溫度進行調整的程序。可以將分割模具7 1和政熱片模具8的溫度分別調整在600。〇以下。另外，也可 以將分割模具7和散熱片模具8的溫度分別調整成比鋼链6 在爐中被加熱的溫度還要高。 另外，可以具有對將坯料從分割模具7和散熱片模具8 中t壓出的速度進行調整的程序。擠壓坯料的速度可以根 據經過加熱的坯料的溫度、組成以及黏度中的至少一方來 〇確定。另外，擠壓坯料的速度也可以根據分割模具7或者散 熱片模具8的形狀以及溫度來確定。例如，在經過加熱的坯 料的溫度更高的情況下，可以使擠壓坯料的速度更快。在 坧料的黏度更小的情況下，可以使擠壓坯料的速度更快。 在模具的形狀更加複雜的情況下，也可以使擠壓坯料的速 21 200837542 例如，可以是·用於形成散熱用翅片部以的模具 的才曰的大小越小，或者槽的數量越多，使擠壓埋料的速度 越慢。 此外’在本示例中，將從分割模具7中擠壓出的分割材 5 直接朝向散熱片模具8擠出。_、在祕料全部從 分割模具7中擠出之前，將分割材料61、62從散熱片模具8 中擠出。由此，能夠進-步提高生產率。此外，也可以在 ^料全部從分賴具7中擠出之後，將分·料6卜62從 散熱片核具8中擠出。這種情況下，將㈣從分割模具7中 10擠出的速度和將通過分割模具7分割而成的分割材料6丄、& 從政熱片模具8中擠出的速度可以不同。 另外，雖然在本例中分割模具7只有一個，但是也可以 將其设置多個。例如，也可以將從分割模具7中擠出的多個 分割材料61、62通過從別的分割模具中擠出來進一步進行 15 分割。 這樣’形成第2圖所示的散熱片2。此外，在第1圖以及 第2圖中說明過的散熱片的基部u雖然都是圓柱形狀，但是 並不一定限定於圓柱形狀。例如，基部丨丨可以在從相對於 接觸面131垂直的方向進行觀察的情況下具有大致對稱的 20形狀。所謂的對稱形狀可以是點對稱的形狀或者線對稱的 形狀。具體來說，可以是正三角形、正方形、長方形、其 形、橢圓形、正多邊形。這種情況下，基部U形成爲具有 這些形狀的柱狀體。另外，再者，雖然在第2圖中說明過的 中心部材料610是圓柱形狀，但是並不一定限定於圓检开/ 22 200837542 狀。在從相對於接觸面131垂直的方向進行觀察的情況下， 中心部材料61〇可以具有大致對稱的形狀。在這種情況下， 多個散熱翅片部材料620配置在中心部材料610的周圍，並 與多個散熱用翅片部12的一端連續地形成。這樣，通過使 5基部11爲對稱的形狀，能夠向散熱翅片均勻地傳熱。 另外，如使用第3、4圖所說明的那樣，由於是從散熱 片模具8中擠出，所以本例的多個散熱用翅片部12分別在相 對於接觸面131大致垂直的方向上延伸。但是，例如也可以 通過在使之旋轉的同時擠壓鋼述，從而使多個散熱用翅片 10 °卩分別开> 成爲相對於與接觸面13垂直的方向具有角度地 延伸。由此，能夠使翅片部的表面積進一步增大。 第5、6圖是表示散熱片1、2中的被冷卻物接觸部13的 切削程序的一部分的立體圖。切斷的散熱片丨被裝卡在車床 上。散熱片1通過車床使散熱用翅片部12被切削加工成大致 15圓柱狀的被冷卻物接觸部13從散熱片1的端面朝向軸向突 出（步驟S5)。這種情況下，在從平行於接觸面131的方向進 行觀察的情況下，接觸面131構成突出部的上表面，所述突 出部設置成比多個散熱用翅片部12朝向垂直於接觸面131 的方向突出。在該上表面上設置有被冷卻物接觸部13，其 20與MPU接觸。在本實施方式的散熱片，如第㈣所示， 被冷卻物接觸部13是圓柱狀的，所以利用車床進行的加工 的作業工時最少。但是，形狀並不限定於此，也可以使用 鍊床等形成例如四棱柱狀的被冷卻物接觸部13。另外，在 希望減小被冷卻物接觸部13的直經的情況下，也可以通過 23 200837542 車床對基部11的外周端進行切削加工。此外，被冷卻物接 觸部13是接觸部的一個示例。通過切削加工，接觸面131的 一部分作爲被冷卻物接觸部丨3而形成。 接著，作爲利用車床進行的切削加工，如第6圖所示， 5在被冷卻物接觸部13的端面（與MPU3接觸的面：接觸面131) 沿著外周端切削加工出環狀槽14(步驟S6)。以在接觸面131 的外周端留出加壓部15(在後面敍述的程序中通過衝床進 行加壓的部位）的方式，在其内側形成有環狀槽14。由此， 接觸面131中的與被冷卻物(MPU3)接觸的是比環狀槽14靠 10 向内側的區域。 第7圖是表示將安裝部件固定在本實施方式的散熱片 上的過程的立體圖。第8圖是表示固定有安裝部件的散熱片 1的立體圖。第9圖是安裝部件的立體圖。爲了冷卻MPU3 使用散熱片1。由此，需要使接觸面131與]^11>113接觸。因此， 15需要相對於安裝有MPU3的母板31適當地安裝散熱片丨。如 第9圖所示，安裝部件9在中央形成有通孔％，並形成有朝 向徑向外側延伸的多個安裝腳91。在安裝腳91的前端形成 有通孔911，緊固母板31和安裝部件9的固定部件9〇插入在 该通孔911中。安裝部件9使用sus等防銹性高的不銹鋼材 20 料。 百先，如第7圖所示，將安裝部件9插入，使形成在安 裝部件9的中央的通孔92與突出的被冷卻物接觸部Π的外 周面配合。在將安裝部件9插入到被冷卻物接觸部^上的時 、文展口ρ件9被壓入至與散熱用翅片部12的端面抵接。在 24 200837542 這種狀態下，利用衝壓機對加壓部15在整周範圍内向第7圖 中的軸向下側進行加壓（步驟S7)。加壓後的加壓部15朝向被 冷卻物接觸部13的徑向外側發生塑性變形。由此，如第8圖 所不’在發生了塑性變形的加壓部15和散熱用翅片部12端 5面之間安裝部件9被夾持，從而被固定。由於加壓部15發生 了塑性變形，因此在變形後的狀態下繼續維持該形狀。由 此’安裝部件9相對於被冷卻物接觸部13固定的狀態繼續維 持。另外，通過加壓，被冷卻物接觸部13的外周面的外形 以向徑向外側擴大了直徑的方式發生變形。這樣，被冷卻 10物接觸部13的外周面通過對安裝部件9的通孔92施加壓力 而進行配合，從而安裝部件9被固定在被冷卻物接觸部的 外周面上。 在安裝部件9的通孔92的内周面上在多處(在本示例中 爲四處)形成有凹口 921。由於被冷却物接触面13的外周面 15的外僅擴大，安装部件9的通孔％的内周面深入(食、、込七） 到被冷却物接触部13的外周面中。這時，通過在通孔92的 内周面形成有凹口92卜絲部件9的相對於被冷卻物接觸 #13的以中〜軸爲中心的周向上的轉動強度提高。 /現有的散熱片結構中，在基部的中心、部壓入有芯。 20作爲其理由爲’擠麼(拉拔)散熱片的加工以在基部的中心形 成有通孔的形狀來進行。一般來說，這樣的散熱片的形狀 是稱爲空心形狀的形狀，不需要進行特殊的擠壓（拉拔)加 工。因此，需要通過上述的熱屢配合將芯壓人到通孔中。 但是，在利用熱壓配合進行芯的壓入時，在對散熱片進行 25 200837542 加熱之後要經過冷卻的程序。即，相對於散熱片進行了哉 衝擊(反覆進行加熱和冷卻的狀態），有可能降低散熱片自‘身 的機械強度。尤其是，與芯的外周的基部相抵的部分，严 度變薄，還存在分割材料的接合面。所以，如果是機^ 5度降低的狀態，則有可能出現分割材料的接合面斷裂、芯 脫落的可能。但是，本例的散熱片中，由於基部爲實心^ 構，因此完全沒有芯脫落的問題。另外，也不需要進行^ 壓配合，也不會出現散熱片的機械強度的降低。 μ 下面，對熱從作爲熱源的MPU3傳遞到散熱片的過 10 行說明。 第10圖是表示MPU和散熱片的接觸狀況的平面圖。 MPU3安裝在母板31上。芯與MPU3通過接觸面接觸。在 MPU3和接觸面之間隔有熱傳導部件。Mpu3産生的熱被傳 遞到芯。即，在MPU3和接觸面之間産生的接觸熱電阻的值 15是重要的。例如，如果與接觸面的表面的平面度是〇， 表面粗糙度是0，並且接觸壓力高，則接觸熱電阻變爲極小 的值。但是，在現貫情況下，平面度和表面粗糙度都不會 爲0,如果沒有構成有熱傳導部件，則在MPU3*接觸面131 之間産生空隙。由於空氣的隔熱效果高，因此當在 20和接觸面131之間形&了空隙的情況下，接觸熱電阻就會變 爲較高的值。在本實施方式中，如上所述，由於在Mpu3 和接觸面131之間隔有熱傳導部件，所以能夠降低接觸熱電 阻的值。 熱傳導部件使用熱傳遞性高的材料。在本實施方式 26 200837542 中，考慮到作業性’使用在聚酰亞胺薄膜(Polyimide Film)、 銘箱等支撐基材上塗布含有填充劑的壓敏黏接劑進行覆蓋 而成的熱感帶(thermal tape)等帶狀部件。熱傳導部件和 MPU3表面、接觸面131之間的接觸面積越高，接觸熱電阻 5的值越低。因此，作爲熱傳導部件的材料，也可以使用以 石夕油作爲基油、並配合了氧化鋁等熱傳導性高的粉末的潤 滑脂狀的熱傳導性矽樹脂等。由於熱感帶使用剪成預定大 小的熱感帶，所以有可能無法有效地利用Mpu3表面和接觸 面131的面積。由於熱傳導性矽樹脂是潤滑脂狀，所以有可 10能在基本沒有間隙的狀態下與各部件的表面緊密貼合。由 此’能夠有效地利用MPU3表面和接觸面⑶的面積。熱傳 導部件只要是熱傳導性高的部件，則能夠進行適當的變 更，形狀以及材質並不限定。 MPU3上産生的熱通過熱傳導部件傳遞至散熱片1的基 15部11。在該傳達的過程中，通過降低熱電阻的值，能夠大 幅度地提咼散熱效率。這裏重要的是，在MpU3和熱傳導部 件、熱傳導部件和接觸面131之間産生的接觸熱電阻的值。 接觸熱電阻的值依賴於接觸壓力、接觸面積、接觸面的表 面粗糙度、各材料的熱傳導率、熱傳導部件的熱傳導率、 20熱傳導部件的厚度和各材料表面的硬度而確定。MPU3的表 面一般用稱爲熱展板(heat spreader)的熱傳導性高的銅板來 構成。因此，需要提出下述方法··使MPU3側的接觸面積、 接觸面的表面粗韆度、材料(銅板）的熱傳導率、材料(銅板) 的硬度爲一定的值，來降低接觸熱電阻的值。另外，由於 27 200837542 政熱片1的接觸面131如上所述使用I呂合金，所以需要提出 下述方法：使接觸面的表面粗糙度、材料(銅）的熱傳導率、 材料(銅）的硬度爲一定的值，降低接觸熱電阻的值。通過增 加接觸壓力來降低接觸熱電阻的值是公知技術。 5 第11圖是表示在散熱片1的上部安裝有冷卻風扇的散 熱器風扇的立體圖。冷卻風扇5隔著柱狀的基部11配置在接 觸面131的相反側。熱從MPU3通過熱傳導部件傳遞至基部 11 °接著，傳遞到基部11的熱被傳遞至散熱用翅片部12。 在本實施方式中，如第11圖所示，通過使冷卻用風扇5相對 10於散熱片1進行動作，冷卻風被提供給散熱用翅片部12，傳 遞至散熱用翅片部12的熱被強制性地散熱。下面，就冷卻 風扇5的結構進行說明。 冷卻風扇5具有：通過旋轉來産生冷卻風的葉輪52 ;使 葉輪52旋轉驅動的電動機（圖略）；將通過葉輪52的旋轉而産 15生的冷卻風轉換爲靜壓能的風洞部511 ;固定電動機的基座 部51 ’連接基座部51和風洞部511的至少三個以上的輻條部 512。 葉輪52具有多個葉片521。葉片521以葉輪52的旋轉軸 爲中心向徑向外側突出設置。通過葉輪52的旋轉，在葉片 20 521中賦予了空氣運動能。通過葉輪52的旋轉，在軸向上吸 氣，並在軸向上排氣。即，通過葉輪52的旋轉，産生軸向 的空氣流。隨著葉輪52的旋轉，由於産生空氣流，所以空 氣流具有朝向徑向外側的離心方向成分、朝向旋轉周向的 迴旋成分、和在軸向上排出的軸向成分的三個成分。如果 28 200837542 考慮空氣流的流速的成分，則在葉輪52的徑向外側流速最 大，在葉輪52的徑向内側流速最小。因此，朝向散熱片1輸 送的冷卻風在散熱用翅片部12的徑向外側流速最大。 10 15 20 如第11圖所示，冷卻風扇5以基部η的中心軸和冷卻風 扇5的葉輪52的旋轉軸大致一致的方式載置在散熱片1的上 側。如第11圖所示，在散熱片1的外周側面，在散熱用翅片 部12的外周邊緣形成有凹口部112。從風洞部511向下方延 伸的臂5111卡定在凹口部112中，散熱片丨和冷卻風扇5被固 疋在一起。在!^?1;3産生的熱通過熱傳導部件傳遞至基部 11。然後，熱從基部11傳遞至散熱用翅片部12。通過冷卻 八扇5的疑轉，在弟11圖中從上方朝向下方供給冷卻風。散 熱用翅片部12在與葉輪52的旋轉方向相同的方向上進行排 石ιϊ 、。因此，冷卻風高效地流入到散熱用翅片部12之間，傳 遞至J政熱用翅片部12的熱被強制性地散熱。通過使散熱片1 _ p風扇5組合，散熱片1的冷卻特性進一步提高。 的另外，散熱用翅片部12朝向與葉輪52的旋轉方向不同 方向彎曲形成。由此，通過葉輪52的旋轉，從葉片521產 、二氮流不會同時與散熱用翅片部干涉。因此，能夠 -由於空氣流和散熱用翅片部12的干涉而産生的碌音的 〜疋，關於散熱用翅片部12，雖然朝向與葉輪52的旋 :向不同的方向彎曲形成，但是即使不彎曲而只是使之 ♦斜也能夠充分地降低空氣流和散熱用翅片部12的千 ~:由於葉輪52的葉片521本身朝向旋轉方向彎曲，所以即 散熱用翅片部12不傾斜而只是朝向放射方向延伸，也能 29 200837542 夠充分地降低空氣流與散熱用翅片部12的干涉。 接著，對於在本實施方式中涉及的其他的散熱器風扇 進行說明。本示例的散熱器風扇，除了固定安裝部件9的固 定方法之外，具有與第_、9Μ2圖中所示的散熱器風扇 5 同樣的結構。 第I2圖是表示到形成本實施方式涉及的其他散熱片爲 止的成形的流程的圖。第13圖是表示本實施方式涉及的其 他散熱片的被冷卻物接觸部的切削過程的一部分的立 圖。 10 >第12圖所示，關於散熱 >；的形成程序，到步驟85爲 止，與第一示例完全一樣。因此，從步驟5以後的程序進A 說明。 订 散熱片1A通過車床將散熱用翅片部12切削加工成使得 大致圓柱狀的被冷卻物接觸部13從散熱片1A的端面朝向軸 15向突出（步驟S5)。接著，作爲利用車床進行的切削加工，如 第13圖所示，在被冷卻物接觸部13的端面（與Mpu3接觸的 面：接觸面131A)，沿著外周端切削加工出朝向散熱片以 側凹陷的階梯部14A(步驟S6A)。在比階梯部14A靠向内側 的區域，即從階梯部14A起形成有在第13圖中朝向軸向上方 20突出的接觸面131A。該接觸面131Λ是與被冷卻物(ΜΡϋ3) 接觸的區域。 第14圖是表示將安裝部件固定在本實施方式涉及的其 他散熱片上的過程的立體圖。第15圖是表示固定有安襞部 件的其他散熱片的立體圖。本例中的散熱片丨八用於冷卻 30 200837542 MPU3。因此，需要使接觸面⑶八與碰忉接觸。爲此，需 要在安裝有MPU3的母板31上安裝散熱片1A。因此，在散 熱片1A上安裝固定有將母板31和散熱片丨八安裝在一起的 安裝部件9。如第9圖所安裂部件9在中央形成有通孔 5 92，並在四處朝向徑向外側形成有安裝腳91。在安裝腳91 的前端形成有通孔9H，緊固母板31和安裝部件9的固定部 件90插入在該通孔911中。安裝部件9使用sus等防銹性高 的不鎮鋼材料。 首先，如第14圖所示，插入安裝部件9,使形成在安裝 10部件9的中央的通孔與被冷卻物接觸部13的外周面配合。在 將安裝部件9插入到被冷卻物接觸部13上的時候，安裝部件 9被壓入至與散熱用翅片部12的端面抵接。在這種狀態下， 通過衝壓機對階梯部14A在整周範圍内向第14圖中的轴向 下側進行加壓（步驟S7A)。加壓後的階梯部14A朝向被冷卻 15物接觸部13的徑向外側發生塑性變形。如第15圖所示，在 發生了塑性變形的階梯部14A和散熱用翅片部12的端面之 間夾持安裝部件9進行固定。由於階梯部14A發生了塑性變 形，因此在變形後的狀態下繼續維持該形狀。因此，安裝 部件9相對於被冷卻物接觸部13固定的狀態被繼續維持。另 2〇外，通過加壓，被冷卻物接觸部_外周面的外形以向徑 向外側擴大了直徑的方式變形。這樣，通過由被冷卻物接 觸部13的外周面對安裝部件9的通孔规加壓力，安裝部件 9被固定在被冷卻物接觸部13的外周面上。 爲了穩定散熱片1、1A的冷卻特性，接觸面13卜131a 31 200837542 的接觸面積在大量生産産品中必須是恒定的。在第一示例 中，比環狀槽14靠向内側的區域成爲接觸面131。這種情況 下，加壓部15被加壓而發生塑性變形，但是該變形沒有波 及到接觸面131。另外，在第二示例中，比階梯部14A靠向 5内側的區域成爲接觸面13丨。這種情況下，雖然階梯部14A 被加壓而發生塑性變形，但是該變形也沒有波及到接觸面 131A。因此，在第一以及第二的任一示例中，接觸面丨^、 131A的面積都是恒定的，能夠實現散熱片丨、ia的冷卻特 性的穩定化。 10 作爲其他的變形例，也可以不形成環形槽14以及階梯 部14A，而是對被冷卻物接觸部13的外周端進行加壓，將安 裝部件9固定在被冷卻物接觸勒的外周面上，對被冷卻物 接觸部13的上表面進行切削加工來形成接觸面⑶。 在第16圖中，表示爲了形成本實施方式涉及的散熱片 15而使用的分割模具7的詳細情況。第17圖中，表示爲了形成 本實施方式涉及的散熱片而使用的散熱片模具8的詳細情 況。分割权具7是第-模具的_個示例，散熱片模具8是第 二模具的一個示例。 本例的分龍具7關·的金屬形成，其具有兩個開 口部22、24、述料通過部26以及分割部28。開口部22收入 ⑽，開口部24排出⑽。在本示例中，形成爲圓筒狀的 分割模具7的兩端部相當於開口部^，開口部 有大致相同的形狀。通過先前說明過的直接法，從開口部 22朝向開口部24擠出坯料。 32 200837542 坯料通過部26設置在開口部22和開口部24之間，具有 内壁面260。本示例中的坯料通過部26相當於形成爲圓筒狀 的分割模具7的筒部分。本示例的堪料通過部％是沿著長邊 方向直徑恒定的圓筒形，内壁面260相當於形成爲圓筒狀的 5 分割模具7的内側的壁。 本示例的分割部2 8具有沿著圓筒的軸向延伸的多個板 狀體268-1〜268-6，以及沿著圓筒的軸向延伸的筒狀體 268-7。為狀體268-7具有比形成爲圓筒狀的分割模具7還小 的直控，筒狀體268-7以分割模具7的軸和筒狀體268-7的車由 10 大致一致的方式，配置在分割模具7的内部。多個板狀體 268-1〜268-6沿著筒狀體268-7的中心軸與筒狀體268-7連 續地形成。在這種情況下，多個板狀體268-1〜268-6從筒狀 體268-7的中心軸彼此構成大致相同的角度，並從該中心軸 呈大致放射狀地進行配置。 15 板狀體268-1的一端與内壁面的一部分262-1連接，板狀 體268-1的另一端與筒狀體268-7連接。另外，板狀體268-4 的一端與内壁面的其他部分264-1連接，板狀體268-4的另一 端與筒狀體268-7連接。由此，分割部28連接坯料通過部26 的内壁面的一部分262-1和内壁面的另一部分264-1。同樣 20 地，分割部28具有的板狀體268-6以及268-3、板狀體268-5 以及268-2通過筒狀體268-7將内壁面的一部分262-2、262-3 和内壁面的另一部分264-2、264-3連接起來。 通過如上所述構成的坯料通過部26以及分割部28的坯 料被分割爲使用第3圖說明的分割材料61、62，並從開口部 33 200837542 24被擠出。 在第18圖中表示分割㈣的形狀。本例的分割模呈7 中，在朝向關被擦出或者被拉拔的方向觀察第二開口部 24的f月況下’第—坯料通過部％的内壁面細以及分割部 5 28，構成大致對稱形狀的多個孔28()、282。分割部μ具有 大致圓形的孔280和以包圍該圓形的孔28〇的方式配置的多 個大致扇形的孔282]〜孤6。在本例中，大致扇形的孔 282-1〜282-6爲具有6〇度内角的扇形的至少—部分的形 狀。通過孔280後的述料形成分割材_，通過各個孔加 10 之後的坯料形成分割材料62。 本例的散熱片模具8由圓筒狀的金屬形成，與分割模具 7相鄰地設置。散熱片模具8包括兩個開口部32、34、坯料 通過部36以及多個翅片部形成槽38。在本示例中，形成爲 圓筒狀的散熱片模具8的兩端部相當於開口部32、％，門口 15部32、34具有大致相同的形狀。第三開口部32收入由分割 模具7分割後的分割材料61、62。 堪料通過部36設置在開口部32、34之間，並具有内辟 面270。本例中的述料通過部36相當於形成爲圓筒狀的散熱 片模具8的筒部分。本例的坯料通過部36是在長邊方向上直 20徑恒定的圓筒形，内壁面270相當於形成爲圓筒狀的散熱片 模具8的内側的壁。多個翅片部形成槽38形成在坯料通過部 36的内壁面270的至少一部分上。 就本例中的翅片部形成槽38來說’在朝向达料被擠出 (或者被拉拔）的方向觀察開口部34的情況下，其沿著以通過 34 200837542 開口部34的大致中心的中心轴爲中心的周向排列。這種情 況下，多個翅片部形成槽38分別沿著從開口部32朝向開口 部34的方向延伸，並在述料通過部36的内壁面270的圓周上 隔開大致相等間隔地設置有多個。本例的多個翅片部形成 5 槽38分別具有多個小槽380,這些槽從開口部32沿著開口部 34具有大致相同的深度和形狀。雖然本例中的多個翅片部 形成槽38和形成在其内部的小槽380相對於排列方向彎曲 地形成，但是也可以適當改變形狀。例如，多個翅片部形 成槽38也可以形成從開口部34的中心朝向外側呈放射狀延 10伸的形狀。 通過了埋料通過部36的分割材料61、62從開口部34排 出。由此，通過了坯料通過部36的分割材料61形成基部n， 通過了多個翅片部形成槽38的分割材料62形成多個散熱用 Μ翅片部12。這樣形成散熱片2，該散熱片2中在基部11上具 15有中心部材料610和散熱翅片部材料62〇，並且多個散熱用 欠片邛12和散熱翅片部材料62〇的一端連續地形成。 ^ 刀剖邵28雖然具有圓形的孔280 !爲大致對卿狀的孔，但是纽對稱職的孔並不被限 20 不的圓形的孔。這裏，所謂的對稱形狀也可以 :點對_形狀或者線對稱的形狀， :本::形、長方形、菱形、橢圓形、正多邊二 形的孔28G的方式配置的多個孔-卜 以進减有細的—部分㈣狀，但是該形狀也可 从進仃適當地變更。你u 更例如’也可以是如第19圖所示，分割 35 200837542 P不具有圓形的孔280而只具有配置爲大致對稱的多個 ―、立1 284_6的結構。或者，也可以是如第20圖所示，分 * 8以壬同心圓狀具有多個圓形的孔286、288並包圍這 呈的外側的方式具有多個孔290-1〜290-6。對於分割部28 有:孔的數$或者形狀來說，可以以被擠出的各分割部 ^具8的翅片部形成槽38中其金屬流變得均勻 的方式，進行適當地變更。 10 一另外’分割模具7也可以由多個模具構成。第21(a)圖表 丁的刀副板具在中央部具有孔280，和配置在其周圍的半圓 狀的孔292-：1、292-2，第21(b)圖所示的分割模具在中央部 具有孔280和配置在其周圍的扇形的孔292-3〜292_6。在該 不例中’兩側的分割模具具有的中央孔，是相同形狀的孔 28〇。枉料也可以是首先被第21(a)圖所示的分割模具分割爲 二個分副材料’然後被擠出至第21(b)圖所示的分割模具。 15例如，在最初的分割模具中，將坯料分割爲略大的分割部 件’在接下來的分割模具中，再分割爲小的分割部件，由 此’犯夠有效地製成更加複雜形狀的分割部件。 本例的分割模具7以及散熱片模具8雖然是分體地形 成，但是也可以將兩者作爲一個模具一體地形成。另外， 20本例的分割模具7以及散熱片模具8雖然都形成爲圓筒形 狀’但是模具形狀並不限定於這樣的形狀。例如，也可以 刀告1j模具7的開口部22和24的大小彼此不同。另外，坦料通 過部26也可以從開口部22朝向24以其直徑緩緩變化的方式 形成爲圓筒形。或者，分割模具7也可以是開口部22、24具 36 200837542 有大致對稱形狀的筒狀體。對於散熱片模具8來說也同樣， 可以適當地變更開口部32、34以及坯料通過部36。 以上，使用實施方式對本發明進行了說明，但是本發 明的技術範圍並不被限定於上述.實施方式所描述的範圍。 5 在上述實施方式中，對於本領域人員而言應當清楚可以進 行多種變更或者改進。根據申請專利範圍所描述的内容可 知：經過多種變更和改進後的方式也包含在本發明的技術 範圍之内。 如上所述，根據本發明的實施方式，能夠提供在可獲 10 得性、成本、可靠性以及生産性方面優良的散熱片及其製 造方法。另外，還可以對MPU牢固地安裝散熱片。 【圖式簡單說明】 第1圖是表示本發明的實施方式涉及的散熱片1的立體 圖。 15 第2圖是表示本發明的實施方式涉及的散熱片2的立體 圖。 第3圖是對散熱片2的形成和模具一起進行表示的立體 圖。 弟4圖是表不到形成散熱片2爲止的流程的圖。 20 第5圖是表示被冷卻物接觸部的切削過程的一部分的 立體圖。 第6圖是表示被冷卻物接觸部的切削過程的一部分的 立體圖。 弟7圖是表不將安裝部件固定在散熱片上的過程的立 37 200837542 體圖。 第8圖是表示固定有安裝部件的散熱片的立體圖。 第9圖是表示安裝部件的立體圖。 第10圖是表示MPU和散熱片的接觸的狀況的平面圖。 5 第11圖是表示在散熱片的上部安裝有冷卻風扇的散熱 器風扇的立體圖。 第12圖是表示到形成其他的散熱片爲止的流程的圖。 第13圖是表示其他散熱片的被冷卻物接觸部的切削過 程的一部分的立體圖。 10 第14圖是表示固定有安裝部件的其他散熱片的立體 圖。 第15圖是表示固定有安裝部件的散熱片的立體圖。 第16圖是用於說明分割模具7的詳細情況的圖。 第17圖是用於說明散熱片模具的詳細情況的圖。 15 第18圖是表示散熱片的分割部的形狀的圖。 第19圖是表示分割部的其他示例的圖。 第20圖是表示分割部的又一示例的圖。 第21圖是說明使用了多個分割模具的情況下的示例的 圖。 20 【主要元件符號說明】 1、1A、2···散熱片 7…分割用模具 3…MPU 8…散熱片模具 5…冷卻風扇 9…安裝部件 6…鋼述(billet) 11…基部 38 200837542 12…散熱用翅片部 13…被冷卻物接觸部 14…環狀槽 14A···階梯部 15…加壓部 22、24···開口部 26…迷料通過部 28…分割部 31…母板 32、34…開口部 36〜述料通過部 38…翅片部形成槽 51…基座部 52…葉輪 61、62…分割材料 90…固定部件 91…安裝腳 92…通孔 112···凹口部 131、131A···接觸面 260、270…内壁面 262-1 〜262-2、262-3···内壁面 的一部分 264-1 〜264-2、264-3···内壁面的 另一部分 268···板狀體 268-1 〜268-6···板狀體 268-7···筒狀體 280、282-1 〜282-6、284-1 〜 284-6、286、288、290-1 〜 290-6、292-1、292-2、292-3 〜292-6…孔 380…小槽 511…風洞部 512…輻條部 521…葉片 610···中心部材料 620···散熱翅片部材料 911…通孔 921···凹口 5111…臂 S1-S7 :步驟 S6A，S7A···步驟 39BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat sink for conducting electronic components, a heat sink fan 5, and a method of manufacturing heat. (4) The present invention relates to a heat sink that cools an object to be cooled such as an electronic component including Mpu. This application is related to the Japanese application described below. The designation of the designated country incorporated by reference to the literature is incorporated herein by reference to the content of the application, which is incorporated herein by reference. 10 1·曰本特开2007_〇〇549〇Application曰January 15, 2007曰 2. Japanese Special Open 2007-083091 Application Date March 27, 2007 Background of the Invention In recent years, The high 15 clock of the MPU (Micro Processing Unit) is obvious. Corresponding to high clocking, The fever of the MPU itself has an increasing trend. However, due to the possibility of malfunction of the MPU due to the heat, Therefore, the cooling problem of the MPU is extremely important. A heat sink fan is mounted on an electronic component such as an MPU. The heat sink fan is a combination of a metal heat sink formed of a plurality of heat radiating fins and a cooling fan that supplies cooling air to the heat sink 20 . despite this, It is also required to increase the cooling efficiency of the radiator fan and the heat transfer efficiency from the MPU to the heat sink. on the other hand, Electronic equipment including MPUs represented by personal computers requires a reduction in cost. therefore, Not only does it require high cooling characteristics, And 5 200837542 requires a low cost heat sink. In order to improve the cooling efficiency of the heat sink, It is generally necessary to enlarge the surface area of the entire heat sink. In order to enlarge the surface area, The thickness of the heat dissipating fins in the circumferential direction can be made thin. The heat dissipating fins are formed so as to extend radially outward from the base portion. but, If the heat sink fins are made thinner, Then the strength of the heat sink will decrease. Therefore, there is a limit in making the heat dissipating fin thin. Further, in the vicinity of the root of the base of the plurality of extended heat radiating fins, If the gap between the fins is too narrow, Then, the cold wind supplied to the heat sink does not smoothly pass between the heat radiating fins. therefore, If you simply expand the surface area of the heat sink, Cooling efficiency does not increase. In order to improve the cooling characteristics of the heat sink, The heat sink needs to be constructed as: The transfer loss during heat transfer from the MPU as a heat source to the heat radiating fin is small, for example, in Patent Document 1, Such a heat sink is disclosed: With a pedestal, The money seat is made up of a hollow hollow portion with a cavity inside, And the 15 fittings are formed in the two faces and arranged to be a high thermal conductivity body capable of conducting heat with respect to the hollow portion. Heat dissipating fins are formed on an outer peripheral portion of the base. High heat transmission & The rate group is formed by copper which is more thermally conductive than the fins and the material of the hollow portion (Ming). In addition, in order to obtain high cooling characteristics in the heat sink, It is preferable to increase the contact pressure at the contact surface of the heat sink #MPU. This is because if you increase the contact pressure, It can reduce the contact thermoelectricity generated between the heat sink and the MPU! The value of 1 is in the case of the mouth, In order to increase the contact pressure between the heat sink and the bump U, The heat sink needs to be properly attached to the MPU. For example, in Patent Document 2, The following methods are disclosed: A notch is formed on the outer peripheral side of the wrath 6 200837542 of the susceptor. The branch member (mounting member) is formed on the support member so that the opening formed in the support member is engaged with the recess. In addition, In addition to the method disclosed in the above Patent Document 2, A method of fixing the mounting member between the heat sink and the core is also known. Patent Document 1: Japanese Patent Laid-Open No. 2005-327854 Patent Document 2: Japanese special opening 2〇〇6_32941 However, As the same part, Although the thermal conductivity is determined by the physical parameters of its components, but, If you touch different parts, Then, the value of the contact thermal resistance becomes larger depending on the condition of the contact surface. The thermal conductivity is such that the p-roll is as shown in Patent Document 1, When a high thermal conductivity body is fitted in the cavity of the hollow portion, A contact thermal resistance is generated at the contact surface of the cavity and the high thermal conductivity. Further, in the heat sink described in Patent Document 1, Because copper is more important than aluminum, Therefore, the high thermal conductivity body accounts for the larger volume of the heat sink. The thermal conductivity is 15, However, the quality of the heat sink is also increased. In addition, Copper has poorer properties than aluminum. The cost as a material is also high. Furthermore, In the structure described in Patent Document 1, The man-hours for fitting the high thermal conductivity body into the cavity of the hollow portion are generated. More specifically, The heat sink needs to be constructed as follows: A through hole having a center axis of 20 centers is formed at the center of the base portion, A cylindrical core is pressed into the through hole. under these circumstances, In order to lower the value of the contact thermal resistance generated at the contact surface between the side surface of the core and the through hole, it is preferable to press-fix and fix the contact pressure. to this end, Press-fitted by hot pressing, The so-called hot press fit is a process of heating the base to the surface temperature to expand the inner diameter of the through hole of the base. Insert the core relative to the hole 7 200837542, The base is then allowed to cool. The value is, If using such an existing method, Not only does it take a lot of work, And to heat or cool the heat sink, Will produce a large temperature change, Therefore, the strength of the heat sink itself may be lowered. In addition, In the case where the temperature range of the heat sink is higher than the temperature set by 5, Due to the thermal expansion generated on the heat sink, It may cause the core to fall off. such, In the structure disclosed in the above Patent Document 1, Considering availability, cost, In the case of reliability and productivity, There is a problem. 10 15 In addition, As mentioned above, In order to improve the cooling characteristics of the heat sink, Need to install the heat sink firmly relative to the chat, However, in the fixing method shown in Patent Document 2, - taking care of the formation of the protrusions in the cutting piece_hole (4) and the notch, Therefore, the rotational strength centering on the central axis of the heat sink is low. In addition, According to the concave π and the processing accuracy of the support member, Between the notch and the support, It is possible to create a play in the axial direction called (4). which is, High reliability is not achieved by the specialization method. In addition, in the existing method of the method disclosed in the special agency, Will generate a lot of installation work. Looking for fewer production hours, Moreover, a fixing method capable of obtaining a high fixed strength is applied. C test content] Summary of invention Therefore, It is an object of the present invention to provide a dispersion that can solve the above problems. Device, Wind W heat sink manufacturing method. This object is achieved by a combination of features described in the separate item of the patent scope. In addition, The dependent patent 200837542 clear patent scope defines a more advantageous specific example of the invention. / Solved the above issues, In the first way, Provide a kind of radiator, It is a hot radiator that conducts electronic components. It is characterized in that The heat sink has: Base, The base has a plane, And a columnar base extending substantially perpendicularly to the plane 5, The region defined by the plane is formed solid in a direction substantially perpendicular to the plane; And a number of fins, Let's extend from the inside to the outside of the base. The base and the plurality of fins are integrally formed of the same material. The base can be composed of a plurality of columns. The plurality of columns extend in a direction generally perpendicular to the plane of the plane. In the case of observing from a direction substantially perpendicular to the plane, The base can have a generally symmetrical shape. In the case of observing from a direction perpendicular to the plane, The base can be formed into a substantially circular shape, And the plurality of fin portions are arranged in the circumferential direction centering on the central axis of the base portion, The central axis of the base passes through a substantially circular 15 substantially center. The plurality of fin portions may also extend in a direction substantially perpendicular to the plane. In addition, The plurality of fin portions may also extend angularly with respect to a direction perpendicular to the plane. The base can also be composed of a plurality of columns. The plurality of columns extend along a central axis, One of the plurality of columns is a substantially circular 20-column center piece including a central axis, At least one other of the plurality of columns is disposed around the center piece, Further, it is formed continuously with one end of the plurality of fin portions. The administrative heat may also have a mounting member 'the mounting member having a through hole at the center' and having a plurality of mounting feet ' extending toward the radially outer side of the center, as viewed from a direction parallel to the plane, The planar structure 200837542 is the upper surface of the protrusion, The protruding portion is disposed to protrude in a direction perpendicular to the plane than the plurality of fin portions. The upper surface has a contact portion in contact with the electronic material, The side faces of the projections fit in the through holes of the mounting member. 5 10 20 The outer peripheral end of the protruding portion may have a plurality of portions that are deformed toward the radially outer side. The phase end at the contact surface of the contact portion may also have a portion which is deformed toward the radial phase over the entire circumference. At least one notch may be formed on the inner peripheral surface of the through hole formed in the mounting member. In a first aspect, a heat sink fan for a heat sink as described above is provided, which has a cooling fan, The cooling fan is disposed on the opposite side of the plane across the base for delivering a cooling (four) air flow to the heat sink H, The cooling fan has an impeller, It has a plurality of blades that generate a flow of air in the pumping direction by rotating about a central axis; Motor department, Its rotating drive leaves ^ /, a wind tunnel having an impeller surrounding the outer side of the impeller, And the branch motor department. In this situation, The cooling fan can be set to m: The central axis of the impeller, And the center of the base of the radiator, The axes are roughly the same. In the third way Φ, # Μ r for a mold, The mold is a mold having a plurality of finned heat sinks formed by squeezing or reducing the material, the sheet having a first mold portion and a second mold portion The first mold print has a first opening portion for releasing the person, a second opening of the material; Not placed between the first opening and the second opening π, And the first-chain material having the inner wall surface passes through the section 4' and the portion of the inner wall surface that connects the dirt passage portion and the split portion of the - surface portion, the H-die portion and the t-die portion U have the first Three openings; The third opening ρ σ of the discharged material is again placed between the third opening and the fourth opening, And having a second blank passage portion of the inner wall surface of 10 200837542; And a plurality of fin portions provided on at least a portion of the inner wall surface of the second billet passing portion to form a groove. The first mold portion and the second mold portion may be formed separately. It can also be formed integrally. 5 in the case where the second opening is viewed in a direction in which the blank is extruded or drawn, The inner wall surface of the first billet passing portion and the divided portion may constitute a plurality of holes having a substantially symmetrical shape. The dividing portion may also have a substantially circular hole, And a plurality of substantially fan-shaped holes arranged to surround the circular holes. The substantially fan shape may be a shape of at least a portion of a sector having an internal angle of 60 degrees. The fin portion forming groove may extend in a direction from the fourth opening portion toward the third opening portion. Further, a plurality of them are provided at substantially equal intervals on the circumference of the inner wall surface of the second billet passing portion. In the case where the fourth opening portion is observed in a direction in which the blind material is extruded or pulled, The plurality of fin portions forming grooves 15 are arranged in a circumferential direction centering on a central axis passing through a substantially center of the opening portion. In addition, The fin portion forming groove may also have a plurality of small grooves. In the third way, Providing a method of manufacturing a heat sink, It is a method of manufacturing a heat sink that cools electronic components. The method of manufacturing the heat sink includes: (a) a process of heating a heat sinking material in a furnace, 20 (b) a process in which the blank is solid and cylindrically extruded from the first mold, And (c) the procedure for cutting off the extruded sample. The program (a-2) for extruding the blank from the second die to divide it into a plurality of columns may be further included before the process (b), The divided plurality of column members are extruded from the first mold in the procedure (b). 11 200837542 The sequence (a) may further comprise a step of adjusting the temperature of the billet to a predetermined temperature. The predetermined temperature may be less than or equal to % of the refining point of the material. In the program (), you can prepare the material of the name as a dip. The predetermined temperature is _. 〇The following. The method of manufacturing the heat sink may further include a procedure of adjusting the temperature of the fourth main member divided by the second mold. The temperature of the plurality of columns to be adjusted may be less than 9% of the point of the refining point. or, The temperature of the plurality of columnar members to be adjusted may be 6 〇 or less. There may be a procedure in the private sequence (b) for adjusting the temperature of the first mold. In this situation, It is possible to have the temperature adjustment foot of the first mold (the f sequence below the TC can adjust the temperature of the first mold to be higher than the temperature of the material in the program (8). In the procedure of dividing the description into a plurality of columns using the second mold, There may be a procedure to adjust the temperature of the second mold. In this situation, It may have a procedure of adjusting the temperature of the second mold to _°C or lower. The temperature of the 15th mode (4) can be adjusted to be higher than the temperature of (4) in the procedure (a). In the sequence (b), there may be a procedure for adjusting the speed of the extrusion material. The speed at which the material is broadcasted can be based on the temperature of the heated material, At least one of the composition and the viscosity is determined. The speed at which the material is extruded can be determined at least according to one of the shape of the first mold and the temperature. The speed at which the chain 20 is extruded can be determined based at least on one of the shape of the second mold and the temperature. One can be in the order (a-2) before the whole turn can be squeezed out from the second mold. A plurality of column members divided by the second mold are taken out from the first mold. Or in program (4), After extruding all the dips from the second mold 12 200837542, Will be extruded using the second die I, , , a plurality of columns made of knives from the first The speed at which the funer squeezes the fun from the second mold. The speed at which the columnar members are divided by the second mold in the program (b) can be extruded from the first mold at different speeds. Brother order: From the second mold __/^, , a column, By squeezing out from the third mold, To further split. Oh, 10 15 Provided in the first method - a method of manufacturing a heat sink, It is a manufacturing method for cold (four) dispersion of electronic components. The manufacturing method of the heat sink includes: (4) Procedures for preparing solid columnar descriptions; (9) a procedure for heating the material in the furnace; (4) Put (4) dust into the split mold, a procedure for turning a material knife into a column; (4) The divided column pieces are housed in the fin mold towel. a process of squeezing a plurality of strips from each other while the plurality of strips are joined to each other; And (4) a program of a plurality of column members which are taken out from the heat sink mold and joined to each other. In the (C) program, The blank billet can be divided into: Forming a central portion of the center of the base; And a plurality of heat dissipating fin portions surrounding the outer portion of the center portion material. 20 workers In the program (4), Can have such a program: The heat sink cutting is applied to a columnar object to be cooled which is centered on the center axis on the axial end surface of either side of the fin/f heat sink. Further, there is a procedure of (1) a method of inserting a mounting member having a through hole at the center so that the outer peripheral side of the object to be cooled is engaged with the through hole, Wherein a plurality of mounting feet extend radially outward on the mounting member; And 13 200837542 5 (g) by performing a plurality of parts or the entire circumference of the outer peripheral end at the contact surface of the contact portion of the object to be cooled (4), The dragon is deformed by a plurality of parts of the outer peripheral end at the contact surface of the cold material contact material or (4) Thereby, the procedure of fixing the mounting member with respect to the side surface of the material of the object to be cooled is fixed. (8) The order of the order may have a procedure of forming a groove along the contact surface = end of the contact portion of the object to be cooled, (g) in the procedure, Contrast the area of the outside of the 10 quilt that was cooled. or, (8) There may be more before the procedure, The outer peripheral end of the contact surface of the object contact portion is formed to the heat sink 2 = = step (4), In (g) Cheng Long cooling, In the first mode, A heat sink is provided by the above manufacturing method. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a heat sink according to an embodiment of the present invention. v Child's calendar Fig. 2 is a perspective view showing the heat sink 2 according to the embodiment of the present invention. Fig. 3 is a view showing the formation of the heat sink 2 and the mold. ^Children Figure 4 is a view showing the flow until the fins 2 are formed. Fig. 5 is a perspective view showing a cutting process of the contact portion of the object to be cooled. Fig. 6 is a perspective view showing a part of the cutting process of the contact portion of the object to be cooled. 14 200837542 Figure 7 is a perspective view showing the process of fixing the mounting member to the heat sink. Figure 8 is a perspective view of a heat sink showing that the mounting member is not fixed. Fig. 9 is a perspective view showing the mounting member. 5 Fig. 10 is a plan view showing the state of contact between the MPU and the heat sink. Fig. 11 is a perspective view showing a radiator fan in which a cooling fan is attached to an upper portion of a heat sink. Fig. 12 is a view showing a flow until another heat sink is formed. Fig. 13 is a perspective view showing a part of the cutting process of the object to be cooled of the other fins. Figure 14 is a perspective view of another heat sink showing that the mounting member is not fixed. Fig. 15 is a perspective view showing a heat sink to which a mounting member is fixed. Fig. 16 is a view for explaining the details of the split mold 7. 15 Fig. 17 is a view for explaining the details of the heat sink mold. Fig. 18 is a view showing the shape of a divided portion of the heat sink. Fig. 19 is a view showing another example of the division unit. Fig. 20 is a view showing still another example of the dividing unit. Fig. 21 is a view showing an example of a case in which a plurality of split molds are used. I: Embodiment 3 Detailed Description of Preferred Embodiments Referring to Figures 1 to 21, the heat sink according to the embodiment, The manufacturing method and the radiator fan will be described. In addition, The heat sink 15 200837542 is an example of a heat sink hereinafter. In addition, In this application, In order to facilitate the vertical direction of each figure as the "up and down direction", However, the direction in the actual installation state is not limited. Fig. 1 is a perspective view showing an example of a heat sink 1 according to an embodiment of the present invention. Fig. 2 is a perspective view showing an example of the heat sink 2 according to the embodiment of the present invention. The heat sink 1 is a heat sink formed by forming a material having a relatively high thermal conductivity such as a solder material by extrusion (drawing) processing. In the present embodiment, When forming the heat sink 1, Aluminum or an aluminum alloy can also be used. 10 The heat sink 1 has a columnar base 11, And a plurality of heat radiating fin portions 12 extending outward from the inner side of the base portion 11. The columnar base 11 has a contact surface 131, The base 11 extends substantially perpendicularly relative to the contact surface 131. In the case of observation from a direction perpendicular to the contact surface 131, The base 11 is formed in a substantially circular shape. The area defined by the contact surface 131 is formed to be solid in a direction substantially perpendicular to the contact surface 131. which is, As shown in Figure 1, The base 11 has a cylindrical shape centered on the central axis. And formed into a solid structure. In addition, The contact surface 131 is an example of a plane described in the patent application. usually, The heat sink 1 is formed in a contact area with outside air, That is, the heat sink 1 has a large surface area. In this example, The plurality of heat radiating fin portions 12 are arranged along the circumferential direction of the center axis of the base portion 11 along 20 . The central axis of the base passes through a substantially circular center. which is, The plurality of heat radiating fin portions 12 are protruded outward from the outer cylindrical surface of the cylindrical base portion 11 toward the outside in the radial direction. The plurality of heat radiating fin portions 12 are continuously formed integrally with the base portion 11. thus, The heat sink 1 sufficiently conducts heat of the electronic component from the base portion 11 to the heat radiating fin portion 16 200837542 12 . In this example, As shown in Fig. 1, the plurality of heat dissipating fin portions 12 radially extending with respect to the base portion u are arranged in a ring shape along the outer circumference of the base portion. Especially to increase the surface area, The heat radiating fin portion 12 is formed to be curved with respect to the arrangement direction. By bending the heat dissipation fin portion 12, The surface area of the fins 5 for heat dissipation increases. In addition, The shape of the fin portion 12 for increasing the surface area of the fin 1 is not limited thereto. The shape can be changed as appropriate. The base portion 11 and the plurality of heat dissipation fin portions 12 are formed of the same material. In this example, The base portion 11 and the heat dissipation fin portion 12 are formed of an aluminum alloy. such, In this example, The heat radiating fin portion 12 and the base portion u are continuously formed 10, Moreover, the base 11 is formed into a solid structure. and so, Between the contact surface 131 and the heat dissipation fin portion 12, There is no contact thermal resistance inside. Therefore, the loss of the thermal resistance can be minimized. And it can improve the cooling efficiency of the heat sink. In addition, It is not pressed and fixed by hot pressing and fitting as in the past. It is possible to obtain a heat sink having a small value of contact thermal resistance. 15 In other words, because (4) materials are harder than copper materials, Therefore, the precision of the finishing in the extrusion (drawing) process using a more complicated mold is high. in comparison, If it is a copper material, Shape complex _ (four) Padding (drawing) and shaping is very difficult, The precision of the fine guard is extremely poor. Therefore, it is very difficult to form a heat sink having a complicated shape by using a copper-based material in a shape of 20 by extrusion (drawing) processing. in comparison, In this example, Since the heat radiating fin portion 12 and the base portion are made of steel material, Instead, use Ming alloy materials, Therefore, even a complicated shape can properly form a heat sink. In Figure 2, The deformation of the heat sink 1 shown in Fig. 1 is shown in the example of 2008 200837542. The base portion w in the fin 2 shown in Fig. 2 is composed of a plurality of inspection pieces, The plurality of columns extend in a direction perpendicular to the contact faces 131. The center material 61〇 is a plurality of column members, It is included; A generally cylindrical centerpiece of the mandrel. The heat dissipating fin portion material 62 is disposed around the center portion 5 material 610. It is continuously formed with a plurality of fins _ one end for heat dissipation. In addition, In the case where the heat sink 2 is formed by using the split mold according to the invention of the present application, Manufacturing the heat sink as shown, In this regard, This will be described in detail later. below, The forming method of the extrusion (drawing) processing of the fins will be described in detail. Figure 3 is a perspective view showing the flow of the mold. The flow of the mold is a flow until the formation of the heat sink 2. Fig. 4 is a view for explaining the flow until the formation of the heat sink 2. As heat sink 1, 2 aluminum alloys used, The 6-lanthanide Al-Mg-Si system or the 1000-series pure A1 is mainly used. among them, Frequently used 6063 in the 6 A1-Mg_Si system. 6063 has excellent extrusion properties, Centered on the window frame for construction, In particular, it is used as a structural member that does not require high strength. Due to heat sink 1, 2 does not require high strength such as structural members for construction, So 6063 is the most commonly used. In the case where thermal conductivity is the highest priority, Use 1060 in the 1000 series pure A1, 1070. 20 First, A cylindrical billet 6 made of an aluminum alloy (a metal block used in a rolling process or the like) is prepared. then, The billet 6 is heated in an oven to about 500 C (step S1). The steel 6 heated in the furnace is softened compared to the normal temperature state. In this state, The billet 6 is pressed into the split mold 7 shown in Fig. 3A. The dividing mold 7 is processed into the following shapes: When the billet 6 18 200837542 is pressed in, The billet 6 is divided into 7 parts (step S2). In this embodiment, The billet 6 is divided into 7 parts by the mold 7 for division. But yes, The number of divisions to be divided is not limited to 7. , The number of divisions can be appropriately changed depending on the shape and size of the heat radiating sheet. Pressed into the steel fun 6 in the split mold 5 of this example, Divided into a plurality of (7) columnar divided materials 61, 62. As shown in Figure 3B, The divided material 61 is a material in which the portion constituting the center portion of the steel (4) is divided by the dividing mold 7. A plurality of divided materials are divided so as to surround the periphery of the divided material 61. then, Dividing material 61, 62 is pressed into the fin mold 8 (step 10 S3). The political hot piece cookware 8 is processed into the following shapes: Extrusion of the split material 61, At 62 o'clock, As shown in Figure 3C, The shape of the plurality of fins 12 for heat dissipation is arranged in the base portion. Dividing material 61, 62 is pressed into the heat sink mold 8, Contact and join each other. which is, The heat sink 2 processed by this construction method is formed in such a state as follows: The steel chain 6 is divided, The heat dissipating fin 15 piece material 620 is arranged around the central portion material 610. And joined to each other. In the extrusion (drawing) processing of the heat sink of the present embodiment, The direct method is mainly used. The so-called direct method is a method of directly pressing the material in the direction of extrusion. Explain in detail, The so-called direct method is such a method: Inserting the heated steel slab into a container equipped with an extrusion die, 20 pairs of billets are compressed in the direction of the mold. The compressed billet is extruded through a die into a predetermined mold. In the direct method, When squeezing, Friction is generated between the billet and the container. In this situation, When the pressure through the mold is different due to different parts, There is a case where metal flow (flow of metal structure) becomes uneven. More specifically, When the blank is extruded in the fin mold 8, Heat dissipation is formed 19 200837542 The position of the fin portion 12 is compared with the portion where the base portion 11 is formed. The adoption of the grasp of the Siam narrow. therefore, In the case of extrusion (drawing) processing, In the steel jade 6, the pressure generated in the billet 6 corresponding to the heat radiating fin portion 12 is higher than the center of the steel rod 6 is high. 7 materials become difficult to flow. therefore, In the case where the blade mold 7 is not used, The metal flow in the steel becomes uneven, There is a case where high-precision extrusion (drawing) processing cannot be performed. Second, however, By using the split mold 7, Before pressing into the heat sink mold 8, Steel buried 6 is divided into divided materials 61, 62. thus, Na's metal flow was cut off, The unevenness of the flow of the metal of each of the divided materials 6 and 62 is lowered. thus, Even if the shape of the fin portion 12 for heat dissipation is complicated, It is also possible to form the fins 2 properly. In particular, by arranging the center material 610 at the center of the base u, It is possible to reduce the thickness formed between the heat radiating fin portion 12 and a portion (reference numeral 610) of the base portion (10), So processing becomes easier. The heat sink 2 after the extrusion (drawing) is finished is finished into an elongated fin 2 which is elongated in the axial direction from the steel field. At the moment of the broadcast, The heat sink 2 is soft due to high temperature. therefore, The heat sink 2 itself is in an easily distorted state. There is also a distorted heat sink 2 therein. therefore, By stretching the ends of the heat sink 1 to each other, The distortion of the fin 2 is corrected to be in a straight state and cooled. Through the assignment, The size of the fin 2 is shown to be high precision. The heat sink 2 after extrusion (drawing) processing is elongated. therefore, The heat radiating sheet 2 is cut in the axial direction in a vertical plane (step by step). In addition, In this example, Although the temperature of the billet 6 is set to about 500. Oh, However, it is also possible to adjust the temperature of the billet according to the speed of the extrusion (drawing) and the composition of the billet 20 200837542. E.g, It is also possible to set the temperature to 90% or less of the melting point of the billet. In the case of the fringe material, The temperature of the steel can be set at about 4 〇〇. Above, And at about 6〇〇t: the following. In addition, X can pass through the temperature of the j-die 7 and the fin mold 8 To adjust the temperature of 5 billet 6. In addition, the above-mentioned private sequence can also include such a stage: a plurality of divided materials 61 which are divided by the 2 cutting die 7 and The temperature of 62 is adjusted. In this case, a plurality of divided materials 61, The temperature of 62 can be less than about 90% of the valley point of the billet. In the case of the materials of the Ming system, It is also possible to set the temperature of the divided material 6 to 62 at about 4Q (n: the above, And below about 6 ° C. or, In the above procedure, It is also possible to have a program for adjusting the temperatures of the split mold 7 and the fin mold 8, respectively. The temperatures of the split mold 71 and the political sheet mold 8 can be adjusted to 600, respectively. 〇The following. In addition, It is also possible to adjust the temperatures of the split mold 7 and the fin mold 8 to be higher than the temperature at which the steel chain 6 is heated in the furnace, respectively. In addition, There may be a program for adjusting the speed at which the blank is pressed out from the split mold 7 and the fin mold 8. The speed at which the billet is extruded can be based on the temperature of the heated billet, At least one of the composition and the viscosity is determined. In addition, The speed at which the blank is extruded can also be determined according to the shape of the split mold 7 or the heat sink mold 8 and the temperature. E.g, In the case where the temperature of the heated billet is higher, It is possible to make the billet faster. In the case where the viscosity of the feed is smaller, It is possible to make the billet faster. In the case where the shape of the mold is more complicated, It is also possible to make the speed of the extruded blank 21 200837542 For example, It may be that the size of the mold for forming the fin portion for heat dissipation is smaller, Or the more the number of slots, The slower the extrusion is done. In addition, in this example, The divided material 5 extruded from the split mold 7 is directly extruded toward the heat sink mold 8. _, Before the secrets are all extruded from the split mold 7, Will divide the material 61, 62 is extruded from the fin mold 8. thus, Can further improve productivity. In addition, It can also be after the material is completely squeezed out of the sub-discipline 7 The material 6b 62 is extruded from the heat sink fixture 8. In this situation, The speed at which (4) is extruded from the split mold 7 and the divided material 6 which is divided by the split mold 7 is & The speed of extrusion from the political hot film mold 8 can be different. In addition, Although there is only one split mold 7 in this example, However, it is also possible to set it multiple. E.g, A plurality of divided materials 61 extruded from the split mold 7 may also be used, 62 is further divided by 15 by extruding from another split mold. Thus, the heat sink 2 shown in Fig. 2 is formed. In addition, The bases u of the fins described in the first and second figures are cylindrical in shape, However, it is not necessarily limited to a cylindrical shape. E.g, The base 丨丨 can have a substantially symmetrical shape 20 when viewed from a direction perpendicular to the contact surface 131. The so-called symmetrical shape may be a point symmetrical shape or a line symmetrical shape. Specifically, Can be an equilateral triangle, square, rectangle, Its shape, Oval, Regular polygon. In this situation, The base U is formed into a columnar body having these shapes. In addition, Furthermore, Although the center material 610 described in Fig. 2 is cylindrical, However, it is not necessarily limited to the round inspection / 22 200837542. In the case of observation from a direction perpendicular to the contact surface 131, The center portion material 61〇 may have a substantially symmetrical shape. under these circumstances, A plurality of heat dissipating fin portions 620 are disposed around the center portion material 610. Further, it is formed continuously with one end of the plurality of heat dissipation fin portions 12. such, By making the base 5 of the 5 a symmetrical shape, It is possible to uniformly transfer heat to the heat dissipating fins. In addition, If you use the third, As illustrated in Figure 4, Since it is extruded from the heat sink die 8, Therefore, the plurality of heat radiating fin portions 12 of this example respectively extend in a direction substantially perpendicular to the contact surface 131. but, For example, it is also possible to squeeze the steel while rotating it. Thereby, a plurality of fins for heat dissipation are separated by 10 ° & It is angularly extended with respect to a direction perpendicular to the contact surface 13. thus, The surface area of the fin portion can be further increased. number 5, Figure 6 shows the heat sink 1. A perspective view of a part of the cutting program of the object 22 to be cooled. The cut fins are mounted on the lathe. The fins 1 are formed by the lathe, and the fins 12 for the heat radiating fins 12 are cut into a substantially cylindrical shape, and the object contact portion 13 is protruded from the end surface of the fins 1 toward the axial direction (step S5). In this situation, In the case of observation from a direction parallel to the contact surface 131, The contact surface 131 constitutes an upper surface of the protrusion, The protruding portion is provided to protrude in a direction perpendicular to the contact surface 131 than the plurality of heat radiating fin portions 12. An object contact portion 13 is provided on the upper surface, Its 20 is in contact with the MPU. In the heat sink of the present embodiment, As shown in item (IV), The object to be cooled 13 is cylindrical, Therefore, the processing time using the lathe is the least. but, The shape is not limited to this, It is also possible to form, for example, a quadrangular prism-shaped object contact portion 13 using a chain bed or the like. In addition, In the case where it is desired to reduce the straightness of the contact portion 13 of the object to be cooled, It is also possible to cut the outer peripheral end of the base 11 by a lathe on 23, 2008, 375. In addition, The object to be cooled 13 is an example of a contact portion. Through cutting, A part of the contact surface 131 is formed as the object contact portion 被3. then, As a cutting process using a lathe, As shown in Figure 6, 5 at the end surface of the object contact portion 13 to be cooled (the surface in contact with the MPU 3: Contact surface 131) The annular groove 14 is cut along the outer peripheral end (step S6). A method of leaving a pressurizing portion 15 (a portion pressed by a punch in a program to be described later) at the outer peripheral end of the contact surface 131 is provided. An annular groove 14 is formed on the inner side thereof. thus, The contact surface 131 is in contact with the object to be cooled (MPU3) in a region 10 inward of the annular groove 14. Fig. 7 is a perspective view showing a process of fixing the mounting member to the heat sink of the embodiment. Fig. 8 is a perspective view showing the heat sink 1 to which the mounting member is fixed. Figure 9 is a perspective view of the mounting member. To cool the MPU3, use the heat sink 1. thus, Need to make the contact surface 131 and ]^11> 113 contacts. therefore, It is necessary to appropriately mount the heat sink 相对 with respect to the mother board 31 on which the MPU 3 is mounted. As shown in Figure 9, The mounting member 9 is formed with a through hole % in the center, A plurality of mounting legs 91 extending outward in the radial direction are formed. A through hole 911 is formed at a front end of the mounting leg 91, A fixing member 9A for fastening the mother board 31 and the mounting member 9 is inserted in the through hole 911. The mounting member 9 is made of a stainless steel material having high rust resistance such as sus. Hundreds of first, As shown in Figure 7, Insert the mounting part 9, The through hole 92 formed in the center of the mounting member 9 is fitted to the outer peripheral surface of the protruding object contact portion 被. When the mounting member 9 is inserted into the contact portion of the object to be cooled, The lap 9 is pressed into contact with the end surface of the heat radiation fin portion 12. In this state of 24 200837542, The pressurizing portion 15 is pressurized to the lower side in the axial direction of Fig. 7 over the entire circumference by the press machine (step S7). The pressurized portion 15 after pressurization is plastically deformed toward the radially outer side of the object contact portion 13 to be cooled. thus, As shown in Fig. 8, the mounting member 9 is sandwiched between the pressurizing portion 15 where the plastic deformation has occurred and the end surface 5 of the heat radiating fin portion 12, Thereby being fixed. Since the pressurizing portion 15 is plastically deformed, Therefore, the shape is maintained in the deformed state. The state in which the mounting member 9 is fixed with respect to the object contact portion 13 is continuously maintained. In addition, By pressurizing, The outer shape of the outer peripheral surface of the object to be cooled 13 is deformed so as to be enlarged in diameter in the radial direction. such, The outer peripheral surface of the object contact portion 13 is cooled by applying pressure to the through hole 92 of the mounting member 9, and is engaged. Thereby, the mounting member 9 is fixed to the outer peripheral surface of the contact portion of the object to be cooled. A notch 921 is formed at a plurality of places (four places in this example) on the inner peripheral surface of the through hole 92 of the mounting member 9. Since only the outer peripheral surface 15 of the contact surface 13 of the object to be cooled is enlarged, The inner peripheral surface of the through hole % of the mounting member 9 is deep (food, , 込7) to the outer peripheral surface of the object to be cooled portion 13. At this time, By the notch 92 formed on the inner peripheral surface of the through hole 92, the rotational strength of the wire member 9 in the circumferential direction centering on the middle to the axis with respect to the object contact #13 of the object to be cooled is improved. / Existing heat sink structure, At the center of the base, The part is pressed into the core. The reason for this is that the processing of the squeezing (drawing) fins is performed in the shape in which the through holes are formed in the center of the base. Generally speaking, The shape of such a heat sink is a shape called a hollow shape. No special squeezing (drawing) machining is required. therefore, It is necessary to press the core into the through hole by the above-described thermal cooperation. but, When the core is pressed by a shrink fit, The procedure to be cooled after heating the heat sink 25 200837542. which is, 哉 impact (reverse heating and cooling) with respect to the heat sink, It is possible to reduce the mechanical strength of the heat sink from the body. especially, a portion that opposes the base of the outer periphery of the core, Strictly thin, There are also joint faces that separate the material. and so, If it is a state where the machine is lowered by 5 degrees, It is possible that the joint surface of the divided material is broken, The possibility of core detachment. but, In the heat sink of this example, Since the base is solid, Therefore, there is no problem of core shedding at all. In addition, There is also no need to make a press fit. There is also no reduction in the mechanical strength of the heat sink. μ, below, The 10 lines of heat transfer from the MPU3 as a heat source to the heat sink are explained. Fig. 10 is a plan view showing the contact state of the MPU and the heat sink. The MPU 3 is mounted on the motherboard 31. The core is in contact with the MPU 3 through the contact surface. There is a heat conducting member at the interval between the MPU 3 and the contact surface. The heat generated by Mpu3 is transferred to the core. which is, The value 15 of the contact thermal resistance generated between the MPU 3 and the contact surface is important. E.g, If the flatness of the surface with the contact surface is 〇, Surface roughness is 0, And the contact pressure is high, Then the contact thermal resistance becomes a very small value. but, In the current situation, Both flatness and surface roughness will not be zero. If there is no heat transfer component, A gap is created between the MPU 3* contact faces 131. Due to the high heat insulation effect of the air, Therefore, when between 20 and the contact surface 131, & In the case of a gap, The contact thermal resistance becomes a higher value. In the present embodiment, As mentioned above, Since there is a heat conducting member at intervals between the Mpu3 and the contact surface 131, Therefore, the value of the contact thermoelectric resistance can be lowered. The heat conductive member uses a material having high heat transfer property. In this embodiment 26 200837542, Considering workability, it is used in Polyimide Film, A tape-like member such as a thermal tape coated with a pressure-sensitive adhesive containing a filler on a support substrate such as a name box. Thermally conductive parts and MPU3 surfaces, The contact area between the contact faces 131 is higher, The lower the value of the contact thermal resistance 5 is. therefore, As a material for the heat conducting member, It is also possible to use Shixia oil as the base oil. It is also blended with a grease-like heat conductive resin such as alumina, which has a high thermal conductivity. Since the thermal belt uses a thermal belt that is cut into a predetermined size, Therefore, it may be impossible to effectively utilize the area of the Mpu3 surface and the contact surface 131. Since the thermally conductive resin is a grease, Therefore, there is a possibility that the surface 10 can be closely adhered to the surface of each component in a state where there is substantially no gap. Thus, the area of the MPU 3 surface and the contact surface (3) can be effectively utilized. As long as the heat transfer member is a member having high heat conductivity, Can make appropriate changes, Shape and material are not limited. The heat generated on the MPU 3 is transmitted to the base portion 11 of the heat sink 1 through the heat conducting member. In the process of communicating, By lowering the value of the thermal resistance, It can greatly improve the heat dissipation efficiency. The important thing here is that In MpU3 and heat conduction components, The value of the contact thermal resistance generated between the heat conducting member and the contact surface 131. The value of the contact thermal resistance depends on the contact pressure, Contact area, Surface roughness of the contact surface, Thermal conductivity of each material, Thermal conductivity of the heat conducting component, 20 The thickness of the heat conducting member and the hardness of the surface of each material are determined. The surface of the MPU 3 is generally constituted by a copper plate having high heat conductivity called a heat spreader. therefore, The following method needs to be proposed. · The contact area on the MPU 3 side, The surface of the contact surface is a thousand degrees thick, Thermal conductivity of material (copper plate), The hardness of the material (copper plate) is a certain value. To reduce the value of the contact thermal resistance. In addition, Since 27 200837542, the contact surface 131 of the political sheet 1 uses Ilu alloy as described above, So you need to propose the following methods: Making the surface roughness of the contact surface, Thermal conductivity of material (copper), The hardness of the material (copper) is a certain value. Reduce the value of the contact thermal resistance. It is a well-known technique to reduce the value of the contact thermal resistance by increasing the contact pressure. 5 Fig. 11 is a perspective view showing a heat sink fan in which a cooling fan is attached to the upper portion of the heat sink 1. The cooling fan 5 is disposed on the opposite side of the contact surface 131 via the columnar base portion 11. Heat is transferred from the MPU3 through the heat transfer member to the base 11 ° Next, The heat transmitted to the base portion 11 is transmitted to the heat dissipation fin portion 12. In the present embodiment, As shown in Figure 11, By causing the cooling fan 5 to move relative to the heat sink 1, Cooling air is supplied to the heat radiating fin portion 12, The heat transferred to the heat radiating fin portion 12 is forcibly radiated. below, The structure of the cooling fan 5 will be described. The cooling fan 5 has: An impeller 52 that generates cooling air by rotation; a motor that rotationally drives the impeller 52 (not shown); Converting the cooling wind generated by the rotation of the impeller 52 into the wind tunnel portion 511 of static pressure energy; The base portion 51' of the fixed motor connects at least three or more spoke portions 512 of the base portion 51 and the wind tunnel portion 511. The impeller 52 has a plurality of blades 521. The vane 521 protrudes outward in the radial direction around the rotation axis of the impeller 52. Through the rotation of the impeller 52, Air kinetic energy is imparted in the blade 20 521. Through the rotation of the impeller 52, Inhale in the axial direction, And exhaust in the axial direction. which is, Through the rotation of the impeller 52, Produces an axial flow of air. With the rotation of the impeller 52, Due to the air flow, Therefore, the air flow has a centrifugal direction component toward the radially outer side, a swirling component that is oriented in the direction of rotation, And three components of the axial component discharged in the axial direction. If 28 200837542 considers the composition of the flow rate of the air stream, Then the flow velocity is the largest outside the radial direction of the impeller 52, The flow velocity is minimized on the radially inner side of the impeller 52. therefore, The cooling air sent to the fins 1 has the largest flow velocity on the radially outer side of the fins 12 for heat dissipation. 10 15 20 As shown in Figure 11, The cooling fan 5 is placed on the upper side of the fin 1 such that the central axis of the base η and the rotation axis of the impeller 52 of the cooling fan 5 substantially coincide. As shown in Figure 11, On the outer peripheral side of the heat sink 1, A notch portion 112 is formed on the outer peripheral edge of the heat dissipation fin portion 12. An arm 5111 extending downward from the wind tunnel portion 511 is locked in the notch portion 112, The fins and the cooling fan 5 are fixed together. in! ^? 1; The heat generated is transferred to the base 11 through the heat conducting member. then, Heat is transmitted from the base portion 11 to the heat dissipation fin portion 12. By cooling the suspected turn of the eight fans, In the figure of the eleventh 11, the cooling air is supplied from the upper side toward the lower side. The heat radiating fin portion 12 performs the lithography in the same direction as the rotation direction of the impeller 52, . therefore, The cooling air efficiently flows between the fins 12 for heat dissipation, The heat transmitted to the J heat fin portion 12 is forcibly radiated. By combining the heat sink 1 _ p fan 5, The cooling characteristics of the fins 1 are further improved. In addition, The heat radiating fin portion 12 is formed to be curved in a direction different from the rotation direction of the impeller 52. thus, Through the rotation of the impeller 52, Produced from the blade 521, The dinitrogen flow does not interfere with the fin portion for heat dissipation at the same time. therefore, - can be caused by the interference of the air flow and the heat dissipation fin portion 12, Regarding the fin portion 12 for heat dissipation, Although facing the rotation with the impeller 52: Bending in different directions, However, even if it is not bent but only made oblique, the air flow and the fins 12 for heat dissipation can be sufficiently reduced: Since the blade 521 of the impeller 52 itself is bent toward the rotational direction, Therefore, the fin portion 12 for heat dissipation does not tilt but extends toward the radial direction. It is also possible to sufficiently reduce the interference of the air flow and the fin portion 12 for heat dissipation by the 2008. then, Other radiator fans involved in the present embodiment will be described. The radiator fan of this example, In addition to the fixing method of fixing the mounting member 9, Have the same _, The same structure as the radiator fan 5 shown in Figure 9. Fig. 12 is a view showing a flow of molding to form another heat sink according to the present embodiment. Fig. 13 is a perspective view showing a part of a cutting process of the object to be cooled contact portion of the other heat sink according to the embodiment. 10 > As shown in Figure 12, About cooling >; Formation process, Go to step 85, It is exactly the same as the first example. therefore, From the procedure after step 5, enter A. The heat radiating fin 1A cuts the heat radiating fin portion 12 by a lathe so that the substantially cylindrical object contact portion 13 protrudes from the end surface of the fin 1A toward the shaft 15 (step S5). then, As a cutting process using a lathe, As shown in Figure 13, At the end face of the object to be cooled 13 (the surface in contact with Mpu3: Contact surface 131A), The step portion 14A that is recessed toward the fin is cut along the outer peripheral end (step S6A). In an area located inward of the step portion 14A, That is, the contact surface 131A that protrudes in the axial direction upward 20 in Fig. 13 is formed from the step portion 14A. The contact surface 131A is a region in contact with the object to be cooled (ΜΡϋ3). Fig. 14 is a perspective view showing a process of fixing the mounting member to the other heat sink according to the embodiment. Fig. 15 is a perspective view showing another heat sink to which an ampoule member is fixed. The heat sink in this example is used to cool 30 200837542 MPU3. therefore, It is necessary to bring the contact surface (3) eight into contact with the bump. to this end, It is necessary to mount the heat sink 1A on the mother board 31 on which the MPU 3 is mounted. therefore, Mounting member 9 for mounting the mother board 31 and the heat sink 丨8 is attached to the heat radiating sheet 1A. The piercing member 9 as shown in Fig. 9 is formed with a through hole 5 92 in the center, Mounting feet 91 are formed at four sides toward the radially outer side. A through hole 9H is formed at a front end of the mounting leg 91, A fixing member 90 that fastens the mother board 31 and the mounting member 9 is inserted in the through hole 911. The mounting member 9 uses a stainless steel material such as SUS which has high rust resistance. First of all, As shown in Figure 14, Insert the mounting part 9, The through hole formed in the center of the mounting member 9 is fitted to the outer peripheral surface of the object contact portion 13 to be cooled. When the mounting member 9 is inserted into the object contact portion 13 to be cooled, The mounting member 9 is pressed into contact with the end surface of the heat radiation fin portion 12. In this state, The step portion 14A is pressurized by the press machine to the lower side in the axial direction of Fig. 14 over the entire circumference (step S7A). The stepped portion 14A after pressurization is plastically deformed toward the radially outer side of the object 15 to be cooled. As shown in Figure 15, The mounting member 9 is sandwiched between the stepped portion 14A where the plastic deformation has occurred and the end faces of the heat radiating fin portions 12 to be fixed. Since the step portion 14A is plastically deformed, Therefore, the shape is maintained in the deformed state. therefore, The state in which the mounting member 9 is fixed with respect to the object contact portion 13 is continuously maintained. Another 2, By pressurizing, The outer shape of the outer surface of the object to be cooled_the outer peripheral surface is deformed so as to increase the diameter radially outward. such, By applying pressure to the through hole of the mounting member 9 by the outer circumference of the object 24 to be cooled, The mounting member 9 is fixed to the outer peripheral surface of the object to be cooled portion 13. In order to stabilize the heat sink 1, 1A cooling characteristics, The contact area of the contact surface 13a 131a 31 200837542 must be constant in mass produced products. In the first example, A region that is inward of the annular groove 14 serves as a contact surface 131. In this situation, The pressurizing portion 15 is pressurized and plastically deformed. However, this deformation does not affect the contact surface 131. In addition, In the second example, A region on the inner side of the step portion 14A is a contact surface 13A. In this situation, Although the step portion 14A is pressurized and plastically deformed, However, this deformation also did not affect the contact surface 131A. therefore, In any of the first and second examples, Contact surface 丨^, The area of 131A is constant, Capable of achieving heat sinks, The cooling characteristics of ia are stabilized. 10 As another modification, It is also possible not to form the annular groove 14 and the step portion 14A. Instead, the outer peripheral end of the object to be cooled 13 is pressurized. Fixing the mounting member 9 on the outer peripheral surface of the object to be cooled, The upper surface of the object to be cooled 13 is cut to form a contact surface (3). In Figure 16, The details of the split mold 7 used to form the heat sink 15 according to the present embodiment are shown. In Figure 17, The details of the fin mold 8 used to form the fins according to the present embodiment are shown. The splitter 7 is an example of the first-mold. The fin mold 8 is an example of the second mold. In this case, the metal is formed by the 7-gate metal. It has two opening portions 22, twenty four, The passage portion 26 and the division portion 28 are described. The opening portion 22 is income (10), The opening portion 24 is discharged (10). In this example, Both end portions of the divided mold 7 formed in a cylindrical shape correspond to the opening portion ^, The openings have substantially the same shape. Through the direct method previously explained, The blank is extruded from the opening portion 22 toward the opening portion 24. 32 200837542 The billet passing portion 26 is disposed between the opening portion 22 and the opening portion 24, There is an inner wall surface 260. The billet passing portion 26 in the present example corresponds to a cylindrical portion of the split mold 7 formed in a cylindrical shape. The yield portion of this example is a cylindrical shape having a constant diameter along the long side direction. The inner wall surface 260 corresponds to the inner wall of the five-divided mold 7 formed in a cylindrical shape. The dividing portion 28 of the present example has a plurality of plate-like bodies 268-1 to 268-6 extending in the axial direction of the cylinder, And a cylindrical body 268-7 extending in the axial direction of the cylinder. The shape body 268-7 has a smaller direct control than the split mold 7 formed into a cylindrical shape. The cylindrical body 268-7 is substantially in the same manner as the vehicle 10 of the divided mold 7 and the cylindrical body 268-7. It is disposed inside the split mold 7. The plurality of plate-like bodies 268-1 to 268-6 are continuously formed along the central axis of the cylindrical body 268-7 and the cylindrical body 268-7. under these circumstances, The plurality of plate-like bodies 268-1 to 268-6 form substantially the same angle from the central axis of the cylindrical body 268-7. The central axis is arranged substantially radially. 15 One end of the plate body 268-1 is connected to a portion 262-1 of the inner wall surface, The other end of the plate body 268-1 is connected to the cylindrical body 268-7. In addition, One end of the plate-like body 268-4 is connected to the other portion 264-1 of the inner wall surface, The other end of the plate-like body 268-4 is connected to the cylindrical body 268-7. thus, The dividing portion 28 connects a portion 262-1 of the inner wall surface of the blank passage portion 26 and another portion 264-1 of the inner wall surface. The same 20 places, The plate-shaped bodies 268-6 and 268-3 which the division part 28 has, The plate-like bodies 268-5 and 268-2 pass a portion 262-2 of the inner wall surface through the cylindrical body 268-7, 262-3 and another part of the inner wall 264-2, 264-3 is connected. The blank passing through the billet passing portion 26 and the dividing portion 28 configured as described above is divided into the divided material 61 described in Fig. 3, 62, It is extruded from the opening portion 33 200837542 24 . The shape of the division (four) is shown in Fig. 18. The split mode of this example is 7 When the second opening portion 24 is viewed in a direction in which it is wiped off or pulled out, the inner wall surface of the first billet passing portion % is thin and the dividing portion 5 28 is a plurality of holes 28 () constituting a substantially symmetrical shape, 282. The divided portion μ has a substantially circular hole 280 and a plurality of substantially fan-shaped holes 282] to 8 which are arranged to surround the circular hole 28A. In this case, The substantially fan-shaped holes 282-1 to 282-6 are at least a partial shape of a sector having a 6-degree internal angle. Forming the partition _ by the material after the hole 280, The divided material 62 is formed by adding a blank after 10 holes. The fin mold 8 of this example is formed of a cylindrical metal. It is disposed adjacent to the split mold 7. The fin mold 8 includes two opening portions 32, 34. A groove 38 is formed in the blank passing portion 36 and the plurality of fin portions. In this example, Both end portions of the fin mold 8 formed in a cylindrical shape correspond to the opening portion 32, %, Door 15 15 34 has substantially the same shape. The third opening portion 32 receives the divided material 61 divided by the split mold 7, 62. The passage portion 36 is disposed at the opening portion 32, Between 34, And has an internal surface 270. The sample passing portion 36 in this example corresponds to a cylindrical portion of the fin mold 8 formed in a cylindrical shape. The billet passing portion 36 of this example is a cylindrical shape having a constant diameter of 20 in the longitudinal direction. The inner wall surface 270 corresponds to a wall formed inside the fin mold 8 of a cylindrical shape. A plurality of fin portion forming grooves 38 are formed on at least a portion of the inner wall surface 270 of the billet passing portion 36. In the case where the fin portion forming groove 38 in this example is viewed from the direction in which the material is extruded (or drawn), the opening portion 34 is viewed. It is arranged in the circumferential direction centering on the central axis passing through the substantially center of the opening portion 34 of 34 200837542. In this situation, The plurality of fin portion forming grooves 38 extend in a direction from the opening portion 32 toward the opening portion 34, respectively. A plurality of the inner wall surfaces 270 of the description passing portion 36 are provided at substantially equal intervals. The plurality of fin portions of the present example form 5 slots 38 each having a plurality of small slots 380, These grooves have substantially the same depth and shape from the opening portion 32 along the opening portion 34. Although the plurality of fin portion forming grooves 38 and the small grooves 380 formed in the inside thereof are curvedly formed with respect to the arrangement direction, However, it is also possible to change the shape as appropriate. E.g, The plurality of fin portion forming grooves 38 may have a shape that radially extends from the center of the opening portion 34 toward the outside. The divided material 61 that has passed through the embedding passage portion 36, 62 is discharged from the opening portion 34. thus, The base portion n is formed by the divided material 61 of the blank passage portion 36, The plurality of fins 12 for heat dissipation are formed by the divided material 62 that has passed through the plurality of fin portion forming grooves 38. This forms the heat sink 2, The heat sink 2 has a central portion material 610 and a heat dissipating fin portion material 62 on the base portion 11. Further, one end of the plurality of heat dissipation fins 12 and the heat dissipating fin portion material 62 is continuously formed. ^ Knife Shao Shao 28 has a round hole 280! For roughly the shape of the hole, However, the holes of the symmetrical position are not limited to 20 round holes. Here, The so-called symmetrical shape can also be: Point to _ shape or line symmetrical shape, : this: : shape, rectangle, diamond, Oval, a plurality of holes arranged in a manner of a positively-shaped polygonal hole 28G--in order to reduce and have a fine-part (four) shape, However, the shape can also be appropriately changed from the entrance. You u, for example, can also be as shown in Figure 19, Segmentation 35 200837542 P does not have a circular aperture 280 but only a plurality of symmetrical configurations - Establish the structure of 1 284_6. or, It can also be as shown in Figure 20, Sub-portion * 8 has a plurality of circular holes 286 in a concentric shape, The outer side of the 288 is surrounded by a plurality of holes 290-1 to 290-6. For the segmentation section 28 there are: The number of holes or shape, The metal flow in the groove 38 can be made uniform in the fin portion of the divided portion 8 of the extruded portion. Make appropriate changes. A further 'dividing die 7' may also be composed of a plurality of dies. Figure 21(a) The diced sub-plate has a hole 280 at the center. And a semicircular hole 292- disposed around it: 1, 292-2, The split mold shown in Fig. 21(b) has a hole 280 at the center portion and sector-shaped holes 292-3 to 292_6 disposed around the hole. In this example, the split molds on both sides have a central hole, It is a hole of the same shape 28〇. The dip material may be first divided into two sub-materials by the split mold shown in Fig. 21(a) and then extruded to the split mold shown in Fig. 21(b). 15 for example, In the original split mold, Dividing the blank into slightly larger split parts' in the next split mold, Divided into small split parts, Therefore, it is effective to make divided parts of more complicated shapes. The split mold 7 and the heat sink mold 8 of this example are formed separately. However, it is also possible to integrally form the two as one mold. In addition, The split mold 7 and the fin mold 8 of this example are both formed in a cylindrical shape, but the shape of the mold is not limited to such a shape. E.g, It is also possible to warn that the sizes of the openings 22 and 24 of the mold 7 are different from each other. In addition, The passage passage portion 26 may be formed in a cylindrical shape so as to gradually change in diameter from the opening portion 22 toward the second portion 24. or, The split mold 7 may also be the opening portion 22, 24 36 200837542 A cylindrical body having a substantially symmetrical shape. The same applies to the heat sink mold 8. The opening portion 32 can be appropriately changed, 34 and a blank passing portion 36. the above, The invention has been described using embodiments. However, the technical scope of the present invention is not limited to the above. The scope of the embodiments described. In the above embodiments, it will be apparent to those skilled in the art that various changes or modifications can be made. It is to be understood that the various modifications and improvements are also included in the technical scope of the present invention. As described above, according to the embodiment of the present invention, it is possible to provide a heat sink excellent in terms of availability, cost, reliability, and productivity, and a method of manufacturing the same. In addition, the heat sink can be firmly attached to the MPU. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a heat sink 1 according to an embodiment of the present invention. Fig. 2 is a perspective view showing the heat sink 2 according to the embodiment of the present invention. Fig. 3 is a perspective view showing the formation of the heat sink 2 together with the mold. FIG. 4 is a view showing a flow until the heat sink 2 is formed. 20 Fig. 5 is a perspective view showing a part of a cutting process of the contact portion of the object to be cooled. Fig. 6 is a perspective view showing a part of a cutting process of the contact portion of the object to be cooled. Figure 7 is a diagram showing the process of not attaching the mounting member to the heat sink. Fig. 8 is a perspective view showing a heat sink to which a mounting member is fixed. Fig. 9 is a perspective view showing the mounting member. Fig. 10 is a plan view showing the state of contact between the MPU and the heat sink. 5 Fig. 11 is a perspective view showing a radiator fan in which a cooling fan is attached to the upper portion of the heat sink. Fig. 12 is a view showing a flow until another heat sink is formed. Fig. 13 is a perspective view showing a part of a cutting process of the object contact portion of the other heat sink. 10 Fig. 14 is a perspective view showing another heat sink to which a mounting member is fixed. Fig. 15 is a perspective view showing a heat sink to which a mounting member is fixed. Fig. 16 is a view for explaining the details of the split mold 7. Fig. 17 is a view for explaining the details of the heat sink mold. 15 Fig. 18 is a view showing the shape of a divided portion of the heat sink. Fig. 19 is a view showing another example of the division unit. Fig. 20 is a view showing still another example of the dividing unit. Fig. 21 is a view for explaining an example in the case where a plurality of split molds are used. 20 [Description of main component symbols] 1. 1A, 2··· Heat sink 7...Dividing die 3...MPU 8...Film die 5...Cooling fan 9...Mounting part 6...Billlet 11...Base 38 200837542 12...heat-dissipating fin portion 13...cooling material contact portion 14...annular groove 14A···step portion 15...pressing portion 22,24···opening portion 26...dancing passage portion 28...dividing portion 31... The mother board 32, 34...the opening part 36~the material passing part 38...the fin part forming groove 51...the base part 52...the impeller 61,62...the division material 90...the fixing member 91...mounting foot 92...through hole 112·· - Notch portions 131, 131A, ..., contact surfaces 260, 270, ..., inner wall surfaces 262-1 to 262-2, 262-3, ..., a part of the inner wall surface 264-1 to 264-2, 264-3, ... The other part of the inner wall surface 268···plate-like body 268-1 to 268-6···plate-shaped body 268-7···cylindrical body 280, 282-1 to 282-6, 284-1 to 284- 6, 286, 288, 290-1 to 290-6, 292-1, 292-2, 292-3 to 292-6... hole 380... small groove 511... wind tunnel portion 512... spoke portion 521... blade 610··· Center material 620···heat dissipating fin material 911...through hole 921· · Arm recess 5111 ... S1-S7: Step S6A, S7A ··· Step 39