JPH06142810A - Formation of titanium alloy - Google Patents
Formation of titanium alloyInfo
- Publication number
- JPH06142810A JPH06142810A JP29018592A JP29018592A JPH06142810A JP H06142810 A JPH06142810 A JP H06142810A JP 29018592 A JP29018592 A JP 29018592A JP 29018592 A JP29018592 A JP 29018592A JP H06142810 A JPH06142810 A JP H06142810A
- Authority
- JP
- Japan
- Prior art keywords
- titanium alloy
- forging
- alloy material
- die
- mold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 39
- 230000015572 biosynthetic process Effects 0.000 title 1
- 239000000956 alloy Substances 0.000 claims abstract description 31
- 238000005242 forging Methods 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 11
- 239000000314 lubricant Substances 0.000 abstract description 15
- 239000000463 material Substances 0.000 abstract description 10
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 230000000452 restraining effect Effects 0.000 abstract 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 8
- 229910052786 argon Inorganic materials 0.000 description 4
- 238000000465 moulding Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Landscapes
- Forging (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、チタン合金素材を高
温度に加熱した金型を用いて成形する方法のうち、特に
腕時計ケースの成形に好適な方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of molding a titanium alloy material using a mold heated to a high temperature, and more particularly to a method suitable for molding a wristwatch case.
【０００２】[0002]
【従来の技術】従来、腕時計ケースはステンレス、銅合
金、アルミ合金素材といった比較的加工し易い金属材料
が使われてきた。しかし、近年、この腕時計ケースに難
加工材として知られているチタン合金素材が使われるよ
うになってきた。このチタン合金素材は高耐食、高強
度、低比重、優れた生体適合性を有しているため腕時計
ケース素材として最適である。チタン合金素材は難加工
材であるため、腕時計ケースに成形するための加工方法
としては、超塑性現象を利用した鍛造方法が最も適して
いる。2. Description of the Related Art Conventionally, metal materials such as stainless steel, copper alloys and aluminum alloys which are relatively easy to process have been used for wristwatch cases. However, in recent years, a titanium alloy material, which is known as a difficult-to-process material, has been used for this wristwatch case. Since this titanium alloy material has high corrosion resistance, high strength, low specific gravity, and excellent biocompatibility, it is optimal as a material for wristwatch cases. Since the titanium alloy material is a difficult-to-machine material, the forging method utilizing the superplastic phenomenon is most suitable as the processing method for forming the wristwatch case.
【０００３】[0003]
【発明が解決しようとする課題】従来チタン合金素材の
鍛造は、超塑性現象を利用する場合７００℃〜１０００
℃という高温度で加工する必要がある。そのため、鍛造
に用いる金型材の酸化防止、金型寿命の延長等の点か
ら、真空またはアルゴンの保護雰囲気中での鍛造が一般
的である。しかし、チタン合金素材は高温度で他の金属
と反応しやすいため、真空またはアルゴンの保護雰囲気
中で鍛造を行った場合は、チタン合金素材が金型に対し
焼き付きを起こしてしまい、離型性が悪く、腕時計ケー
スに必要な綺麗な鍛造肌が得られないという問題があっ
た。[Problems to be Solved by the Invention] In the conventional forging of titanium alloy material, 700 ° C. to 1000 ° C. when superplastic phenomenon is utilized.
It is necessary to process at a high temperature of ℃. Therefore, from the viewpoint of preventing oxidation of the die material used for forging, extending the die life, etc., forging is generally performed in a vacuum or a protective atmosphere of argon. However, since titanium alloy material easily reacts with other metals at high temperature, when forging is performed in a vacuum or in a protective atmosphere of argon, the titanium alloy material will seize on the die, resulting in mold releasability. However, there was a problem that the beautiful forged skin necessary for the watch case could not be obtained.
【０００４】また、チタン合金素材の表面にあらかじめ
酸化膜を形成させたプリフォームを使用しても、鍛造に
よって表面の酸化膜は引き裂かれてしまい、そこにチタ
ン合金素材の新生面が現れ、真空またはアルゴンの保護
雰囲気中の鍛造では金型とチタン合金素材とが直接接触
するため焼き付きを起こしてしまうという問題もあっ
た。Even if a preform having an oxide film formed in advance on the surface of a titanium alloy material is used, the oxide film on the surface is torn by forging, and a new surface of the titanium alloy material appears there, and a vacuum or In forging in a protective atmosphere of argon, the die and titanium alloy material come into direct contact with each other, which causes a problem of seizure.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
に、この発明はチタン合金素材の鍛造による成形方法に
おいて、大気中で７００℃〜１０００℃に加熱した金型
にチタン合金素材をセットして、チタン合金素材が鍛造
温度までに加熱されないうちに、即時に大気中で20mm／
分以下の速度で鍛造を行ってチタン合金製品を成形す
る。In order to solve the above-mentioned problems, the present invention is a method of forming a titanium alloy material by forging, in which the titanium alloy material is set in a mold heated to 700 ° C to 1000 ° C in the atmosphere. The titanium alloy material is immediately heated in the atmosphere to 20 mm /
Forging is performed at a speed of not more than a minute to form a titanium alloy product.
【０００６】[0006]
【作用】上記のように構成されたチタン合金製品の成形
方法において、チタン合金素材を金型にセットした後、
即時に大気中で鍛造を行うことによってチタン合金素材
表面に薄い酸化膜が形成され、この薄い酸化膜がチタン
合金素材と金型材との反応を抑え、焼き付きを防ぐ作用
をする。In the method for forming a titanium alloy product having the above-described structure, after the titanium alloy material is set in the mold,
Immediately forging in the air forms a thin oxide film on the surface of the titanium alloy material, and this thin oxide film suppresses the reaction between the titanium alloy material and the die material, and acts to prevent seizure.
【０００７】また、鍛造での変形によって引き裂かれた
酸化膜の間に、チタン合金素材の新生面が現れ、金型材
とチタン合金素材とが反応を開始しようとしても、大気
中で鍛造を行うことによってチタン合金素材の新生面は
ただちに薄い酸化が形成されるため、金型材との反応は
抑えられ焼き付きを起こすことはない。酸化膜は薄くて
も離型性を十分に満足するので、腕時計ケースなどチタ
ン合金製品に必要な綺麗な鍛造肌が得られる。Further, even if a new surface of the titanium alloy material appears between the oxide films torn by the deformation during the forging, and the die material and the titanium alloy material start to react with each other, the forging is performed in the atmosphere. Since the new surface of the titanium alloy material immediately forms a thin oxidation, the reaction with the mold material is suppressed and seizure does not occur. Even if the oxide film is thin, the mold releasability is sufficiently satisfied, so that a clean forged skin required for titanium alloy products such as watch cases can be obtained.
【０００８】さらに、形成された薄い酸化膜を鍛造時に
潤滑剤として作用させることにより、潤滑性、離型性を
潤滑剤と同様に付与することが出来るため、潤滑剤を使
用することなく鍛造による腕時計ケース成形が可能とな
る。金型内に潤滑剤が蓄積することがないので綺麗な鍛
造肌でしかも金型寸法通りのチタン合金製品が得られ
る。また、潤滑剤の塗布、金型に蓄積した潤滑剤の除去
といった生産の障害となる工程は削除され、チタン合金
素材を金型にセットした後、即時に鍛造を開始するので
鍛造時間の短縮にもつながる。Further, since the formed thin oxide film acts as a lubricant during forging, the lubricity and releasability can be imparted similarly to the lubricant, so that the forging can be performed without using the lubricant. It enables the molding of wristwatch cases. Since the lubricant does not accumulate in the mold, a titanium alloy product with a clean forged surface and the exact size of the mold can be obtained. In addition, the steps that hinder the production, such as applying lubricant and removing the lubricant accumulated in the mold, have been deleted.Since the titanium alloy material is set in the mold and forging is started immediately, the forging time can be reduced. Is also connected.
【０００９】[0009]
【実施例】以下に、この発明の実施例を図に基づいて説
明する。図１に、本発明の実施に使用した鍛造装置を示
す。１は上金型、２は下金型である。上金型１および下
金型２を貫通してノックアウトピン３が設けてある。４
はチャンバー５内に設けられたヒーターで、金型を加熱
する。チャンバー５の雰囲気は大気である。プレスラム
６で上金型１を押圧してプリフォーム７を鍛造する。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a forging device used for carrying out the present invention. 1 is an upper die, and 2 is a lower die. A knockout pin 3 is provided through the upper mold 1 and the lower mold 2. Four
Is a heater provided in the chamber 5 to heat the mold. The atmosphere of the chamber 5 is the atmosphere. The preform 7 is forged by pressing the upper die 1 with the press ram 6.
【００１０】使用したチタン合金素材はβ型チタン合金
でありその成分を表１に示す。このチタン合金素材を図
２に示すプリフォーム７に加工した。腕時計ケース成形
方法は、このプリフォーム７を７２５℃に加熱された下
金型２にセットし、即時にプレスラム速度を50mm／分、
20mm／分、３mm／分、0.15mm／分の４種類について鍛造
を開始し、腕時計ケースの成形を行った。プリフォーム
７を下金型２にセットした時点からプリフォーム７の表
面には薄い酸化膜が形成され、プリフォーム７と下金型
２の反応は抑えられ焼き付きを起こすことはなかった。The titanium alloy material used is a β-type titanium alloy, and its components are shown in Table 1. This titanium alloy material was processed into the preform 7 shown in FIG. The watch case is formed by setting the preform 7 in the lower mold 2 heated to 725 ° C. and immediately setting the press ram speed to 50 mm / min.
Forging was started for four types of 20 mm / min, 3 mm / min, and 0.15 mm / min to form a wristwatch case. From the time when the preform 7 was set in the lower mold 2, a thin oxide film was formed on the surface of the preform 7, the reaction between the preform 7 and the lower mold 2 was suppressed, and seizure did not occur.
【００１１】 図３に大気中での鍛造例として、プレスラム速度を0.15
mm／分の一定としたときのストロークと鍛造荷重の関係
を示す。実線は潤滑剤を使用したときの荷重曲線で、点
線は潤滑剤を使用しなかったときの荷重曲線である。潤
滑剤には粉末セラミックスを使用した。潤滑剤を使用し
なかったときの鍛造荷重は潤滑剤を使用したときのと比
べほとんど変わらなかった。また、図示してないがプレ
スラム速度20mm／分、３mm／分で鍛造したものも同様な
結果となった。しかし、プレスラム速度50mm／分で鍛造
したものは金型に充満せず、金型寸法通りの腕時計ケー
スは得られなかった。[0011] As an example of forging in air, press ram speed of 0.15
The relationship between the stroke and the forging load when the mm / min is constant is shown. The solid line is the load curve when the lubricant is used, and the dotted line is the load curve when the lubricant is not used. Powdered ceramics was used as the lubricant. The forging load when no lubricant was used was almost the same as when the lubricant was used. Further, although not shown, the one forged at a press ram speed of 20 mm / min and 3 mm / min gave similar results. However, what was forged at a press ram speed of 50 mm / min did not fill the mold, and a watch case of the size of the mold could not be obtained.
【００１２】この鍛造例での鍛造時間は30分であるにも
かかわらず、鍛造されたチタン合金素材は、潤滑剤の有
無に関係なく金型に対し焼き付きを起こすことはなかっ
た。潤滑剤を使用しなくても離型性にも問題は生じるこ
となく金型寸法通りの腕時計ケースと、それに必要な綺
麗な鍛造肌が得られた。Although the forging time in this forging example was 30 minutes, the forged titanium alloy material did not seize on the die regardless of the presence or absence of the lubricant. Even without the use of a lubricant, there was no problem with releasability, and the watch case was exactly the size of the mold, and the clean forged skin required for it was obtained.
【００１３】ここで、チタン合金素材はβ型に限らずα
＋β型あるいはα型であっても良いことは言うまでもな
い。Here, the titanium alloy material is not limited to β type, but α type
It goes without saying that it may be + β type or α type.
【００１４】[0014]
【発明の効果】以上説明したように、この発明によれば
チタン合金素材を大気中で即時に鍛造を行い、腕時計ケ
ースを成形するという構成としたので、チタン合金素材
の表面は常に薄い酸化膜で被われ、チタン合金素材と金
型の反応は抑えられ焼き付きを起こすことなく、金型寸
法通りの綺麗な鍛造肌の腕時計ケースが、潤滑剤を使用
しなくとも得ることができるという効果がある。また、
大気中で鍛造を行うため、従来技術のようなチャンバー
内の真空引きあるいはアルゴン置換といった工程は不必
要であるため、非常に効率的な鍛造が行える。As described above, according to the present invention, the titanium alloy material is immediately forged in the air to form the wristwatch case. Therefore, the surface of the titanium alloy material is always a thin oxide film. Since the reaction between the titanium alloy material and the mold is suppressed and seizure does not occur, a watch case with a clean forged skin according to the mold size can be obtained without using a lubricant. . Also,
Since the forging is performed in the atmosphere, it is possible to perform very efficient forging, since it is not necessary to perform a process such as evacuation in the chamber or argon substitution as in the conventional technique.
【図１】本発明の実施に使用した鍛造装置を示した説明
図である。FIG. 1 is an explanatory view showing a forging device used for carrying out the present invention.
【図２】本発明の実施に使用したチタン合金素材のプリ
フォームを示した説明図である。FIG. 2 is an explanatory view showing a preform of a titanium alloy material used for carrying out the present invention.
【図３】本発明の実施例としてストロークと鍛造荷重の
関係を示した説明図である。FIG. 3 is an explanatory diagram showing a relationship between a stroke and a forging load as an example of the present invention.
１ 上金型 ２ 下金型 ３ ノックアウトピン ４ ヒーター ５ チャンバー ６ プレスラム ７ プリフォーム ８ 扉 ９ 冷却水 1 Upper mold 2 Lower mold 3 Knockout pin 4 Heater 5 Chamber 6 Press ram 7 Preform 8 Door 9 Cooling water
Claims (1)
１０００℃に加熱保持してある金型にセットした後、即
時に20mm／分以下の速度で鍛造することを特徴とするチ
タン合金製品の成形方法。1. A titanium alloy material is heated to 700 ° C.
A method for forming a titanium alloy product, which comprises setting in a mold heated and maintained at 1000 ° C. and immediately forging at a speed of 20 mm / min or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29018592A JPH06142810A (en) | 1992-10-28 | 1992-10-28 | Formation of titanium alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29018592A JPH06142810A (en) | 1992-10-28 | 1992-10-28 | Formation of titanium alloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06142810A true JPH06142810A (en) | 1994-05-24 |
Family
ID=17752855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29018592A Pending JPH06142810A (en) | 1992-10-28 | 1992-10-28 | Formation of titanium alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06142810A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997037049A1 (en) * | 1996-03-29 | 1997-10-09 | Kabushiki Kaisha Kobe Seiko Sho | High strength titanium alloy, product made therefrom and method for producing the same |
-
1992
- 1992-10-28 JP JP29018592A patent/JPH06142810A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997037049A1 (en) * | 1996-03-29 | 1997-10-09 | Kabushiki Kaisha Kobe Seiko Sho | High strength titanium alloy, product made therefrom and method for producing the same |
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