JPH0796161B2 - Anti-vibration boring bar and anti-vibration bar - Google Patents
Anti-vibration boring bar and anti-vibration barInfo
- Publication number
- JPH0796161B2 JPH0796161B2 JP1221303A JP22130389A JPH0796161B2 JP H0796161 B2 JPH0796161 B2 JP H0796161B2 JP 1221303 A JP1221303 A JP 1221303A JP 22130389 A JP22130389 A JP 22130389A JP H0796161 B2 JPH0796161 B2 JP H0796161B2
- Authority
- JP
- Japan
- Prior art keywords
- vibration
- bar
- contact
- blind hole
- boring bar
- 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.)
- Expired - Lifetime
Links
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 230000000694 effects Effects 0.000 description 8
- 238000013016 damping Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000006096 absorbing agent Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
Landscapes
- Cutting Tools, Boring Holders, And Turrets (AREA)
- Vibration Prevention Devices (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は中ぐり盤，マシニングセンタ，旋盤等の工作機
械のボーリングに使用する防振ボーリングバー或いは長
い軸の共振を防ぐ防振バーに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration boring bar used for boring of machine tools such as boring machines, machining centers, lathes, etc., or an anti-vibration bar for preventing resonance of a long shaft.
従来の技術 従来ボーリングバーは一般的に細長く刃具迄の軸長さは
軸径に比して数倍になり、重切削を行う場合びびりを起
こして満足できる切削が困難であった。このためコンプ
ライアンスをある値以下にする構造のものとして例えば
ダンパをつけた第４図、中心穴に減衰材を充填した第５
図のものが知られている。2. Description of the Related Art Conventional boring bars are generally long and slender, and the shaft length up to the cutting tool is several times as large as the shaft diameter. When heavy cutting is performed, chatter occurs and satisfactory cutting is difficult. For this reason, as a structure having a compliance below a certain value, for example, FIG. 4 with a damper, and FIG. 5 with a damping material filled in the center hole.
The one in the figure is known.
発明が解決しようとする課題 第４図のものは軸部外周に複数個のリングを嵌装したば
ねで刃具側に付勢しているためボーリングバー軸部が大
径となり、切屑がばねにからむ不都合があるとともに制
振効果が充分でないという問題があった。第５図のもの
は改善されたものであるが、所期の充分な制振効果が得
られていないという問題があった。In the case of FIG. 4, the boring bar shaft has a large diameter and chips are entangled in the spring because a spring having a plurality of rings fitted around the shaft is biased toward the cutting tool. There is a problem in that it is inconvenient and the damping effect is not sufficient. Although the thing of FIG. 5 was improved, there was a problem that the desired sufficient damping effect was not obtained.
本発明は従来の技術の有するこのような問題点に鑑みな
されたもので、その目的とするところは所望の制振効果
が得られる防振ボーリングバー及び防振バーを提供しよ
うとするものである。The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide an anti-vibration boring bar and an anti-vibration bar that can obtain a desired anti-vibration effect. .
課題を解決するための手段 上述の目的を達成するために本発明は、ボーリングバー
に刃具側が閉止された中心盲穴を削設し、該中心盲穴の
底中心部と小面積で接触する制振子を挿入し、該制振子
に続いて互いに接触しうるように鋼球と円板とよりなる
複数組を遊挿配列し、各接触部を圧接するばねを内蔵し
たものである。Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a boring bar having a central blind hole whose blade side is closed and which contacts a central part of the bottom of the central blind hole in a small area. A pendulum is inserted, a plurality of sets of steel balls and discs are loosely inserted and arranged so that they can come into contact with each other, and springs for press-contacting the respective contact parts are built in.
また、加振力が加えられるバーの中心盲穴の底中心部と
小面積で接触する制振子を挿入し、該制振子に続いて互
いに接触しうるように鋼球と円板とよりなる複数組を遊
挿配列し、且つ接触部を圧接するばねを内蔵したもので
ある。In addition, a vibration damper, which comes into contact with the center of the bottom of the central blind hole of the bar to which a vibration force is applied in a small area, is inserted, and a plurality of steel balls and disks are formed so that they can contact each other subsequently to the vibration damper. A set is loosely inserted and a spring for press-contacting the contact portion is incorporated.
作用 切削による切屑の生成過程で発生する振動がまたは加振
力が軸部に伝えられるが、制振子の接触摩擦力，円板の
内壁面との衝突により振動エネルギーが減少されてボー
リングバーまたはバー軸部の振動は改善されたコンプラ
イアンスによる大きな制振効果によって押さえられびび
りが発生しない。Action Vibration or excitation force generated in the chip generation process by cutting is transmitted to the shaft part, but the vibration energy is reduced by the contact friction force of the vibration suppressor and the collision with the inner wall surface of the disk, and the boring bar or bar Vibration of the shaft is suppressed by the large damping effect of the improved compliance, and chatter does not occur.
実施例第１ 第１図，第２図にもとづき説明する。An embodiment will be described with reference to FIGS. 1 and 2.
ボーリングバーはテーパシャンク１につづきATCによっ
て把持する把持溝２を有するフランジ3,軸径に比して長
い軸部４が形成されており、軸部先端には刃具５が取付
けられている。そしてテーパシャンク１の端面より中心
盲穴６が軸部４の剛性をそこなわない直径で端近くに達
する長さ穿設されており、開口部には雌ねじ７が刻設さ
れていて、プルスタッド８が螺着されている。The boring bar is provided with a taper shank 1, a flange 3 having a grip groove 2 to be gripped by an ATC, and a shaft portion 4 which is longer than the shaft diameter, and a cutting tool 5 is attached to the tip of the shaft portion. A central blind hole 6 is formed from the end surface of the taper shank 1 with a diameter that does not impair the rigidity of the shaft portion 4 and reaches a length close to the end, and an internal thread 7 is engraved in the opening portion of the pull stud 1. 8 is screwed on.
中心盲穴６には底部に円板９が嵌装され、続いて管状磁
石10,同じ内外径の管状摺動体11,同じく管状磁石12が互
いに当接して摺動可能に遊挿され板材13を介してばね14
がプルスタッド８との間に介装されていて各部の軸方向
端面が圧接されている。そして管状磁石10・12,管状摺
動体11の中心には所の隙間ｌで棒状磁石15が封入されて
いる。管状磁石10・12と棒状磁石15は互いに反撥する磁
極になるように選定されていて動吸振器が構成されてい
る。磁石の反撥力と隙間との関係は磁力の強さが距離の
２乗に反比例するため第２図のようであるので、距離ｌ
の変化Δｌに対して磁力Ｆの変化ΔＦが僅になるような
隙間に形成されている。A disc 9 is fitted to the bottom of the central blind hole 6, and subsequently, a tubular magnet 10, a tubular sliding body 11 having the same inner and outer diameters, and a tubular magnet 12 are abutted against each other and slidably inserted so that a plate member 13 is inserted. Through spring 14
Is interposed between the pull stud 8 and the pull stud 8, and the axial end faces of the respective parts are pressed against each other. A rod-shaped magnet 15 is enclosed at the center of the tubular magnets 10 and 12 and the tubular sliding body 11 with a gap l. The tubular magnets 10 and 12 and the rod-shaped magnet 15 are selected so as to be magnetic poles that repel each other to form a dynamic vibration reducer. The relationship between the repulsive force of the magnet and the gap is as shown in FIG. 2 because the strength of the magnetic force is inversely proportional to the square of the distance.
Is formed in the gap such that the change ΔF of the magnetic force F becomes small with respect to the change Δl of.
本発明の防振ボーリングバーを例えばマシニングンセン
タの主軸に装着して切削を行うと刃具５には切削力が作
用し切屑生成過程で振動が発生しボーリングバーの固有
振動数で共振するようになる。しかし管状磁石10・12と
棒状磁石15が互いに反撥する関係にあって隙間の変化Δ
ｌに対して磁力の変化ΔＦ即ちばね定数（コンプライア
ンスの逆数）の変化は僅かであるので、ボーリングバー
の固有振動数f0,内部磁石系の固有振動数fRとすればf0
≒fRとなり動吸振器の高減衰効果によって共振は防止さ
れひびりのない切削が行われる。When the anti-vibration boring bar of the present invention is mounted on, for example, the main shaft of a machining center to perform cutting, a cutting force acts on the cutting tool 5 to generate vibration in the chip forming process and resonate at the natural frequency of the boring bar. Become. However, since the tubular magnets 10 and 12 and the bar-shaped magnet 15 are in a repulsive relationship with each other, the gap change Δ
Since the change of the magnetic force change ΔF or spring constants (reciprocal of compliance) is small with respect to l, boring bar natural frequency f 0, if the natural frequency f R of the internal magnet system f 0
≈ f R and resonance is prevented and crack-free cutting is performed by the high damping effect of the dynamic vibration absorber.
実施例第２ 第３図において実施例第１と同じ部分には同符号を付し
て説明を省略する。中心盲穴６の底6aは本例では円錐角
120゜の円錐凹面に形成されており、円錐角が本例では1
15゜の円錐コマ20が当接されている。円錐コマ20は中心
盲穴６の内周とは本例では0.5mmの隙間とされ、比重の
高い材料を用いることが好ましい。この円錐コマ20の後
端面には複数個の鋼球21を介して同じ材料の円板22が当
接し、鋼球21と円板22の複数組が中心盲穴内に一列に配
置されている。そして各当接面を圧接するために最後の
円板22とプルスタッド８との間にばね23が介挿されてい
る。各円錐面の先端はつぶれを防ぐために焼入されてい
ることが好ましく、円板22の径と板厚み，鋼球の径ばね
力は系の固有振動数でコンプライアンスが最小となるよ
うに選択されている。Embodiment 2 In FIG. 3, the same parts as those in Embodiment 1 are designated by the same reference numerals and their description is omitted. The bottom 6a of the central blind hole 6 has a cone angle in this example.
It is formed on a 120 ° conical concave surface, and the cone angle is 1 in this example.
A conical top 20 of 15 ° is abutted. In this example, the conical top 20 has a clearance of 0.5 mm from the inner circumference of the central blind hole 6, and it is preferable to use a material having a high specific gravity. Discs 22 made of the same material are in contact with the rear end surface of the conical piece 20 via a plurality of steel balls 21, and a plurality of sets of the steel balls 21 and the discs 22 are arranged in a line in the central blind hole. A spring 23 is inserted between the last disk 22 and the pull stud 8 to press the contact surfaces against each other. The tip of each conical surface is preferably quenched to prevent crushing, and the diameter and thickness of the disk 22 and the diameter of the steel ball spring force are selected to minimize compliance at the natural frequency of the system. ing.
この防振ボーリングバーで切削を行うと切屑の生成過程
で振動が発生し刃具５の切削力が軸部４を振動させる。
しかし円錐コマの接触摩擦力と独立に動く円板22の中心
盲穴の内壁面との衝突によって振動エネルギーを減少を
促進させ、また制振部材の慣性によって振動位相がずら
されてひびりのない正常な切削ができる。When cutting is performed with this anti-vibration boring bar, vibration is generated in the chip forming process, and the cutting force of the cutting tool 5 vibrates the shaft portion 4.
However, the contact frictional force of the conical top and the collision with the inner wall surface of the central blind hole of the disk 22 that moves independently promotes the reduction of vibration energy, and the inertia of the damping member shifts the vibration phase to prevent cracks. Can cut normally.
なお本実施例第1,第２の構成をバーに加振力が作用して
防振の必要性あるバー応用できることは勿論である。It is needless to say that the first and second embodiments of the present invention can be applied to a bar in which vibration is required by vibrating force acting on the bar.
効果 上述のように構成したので、本発明は以下の効果を奏す
る。Effects With the above-described configuration, the present invention has the following effects.
請求項１の防振ボーリングバー中心盲穴に円錐コマと球
体と円板の複数組でなる制振部材を互いに圧接状態で封
入したから固有振動数におけるコンプライアンスが従来
のボーリングバーの数分の１以下にすることができ、従
来切削できなかった工作物の切削が可能となった。The vibration damping member consisting of a plurality of sets of a conical piece, a sphere and a disk is enclosed in the central blind hole of the vibration proof boring bar according to claim 1 in a pressure contact state with each other, so that the compliance at the natural frequency is a fraction of that of the conventional boring bar. It is possible to do the following, and it becomes possible to cut a workpiece that could not be cut in the past.
請求項２の防振バーも請求項１と同じ効果がある。The vibration-proof bar according to claim 2 has the same effect as that of claim 1.
第１図は本発明の実施例の縦断面図、第２図は磁力と隙
間との関係図、第３図は他の実施例の縦断面図、第４
図，第５図は従来の防振ボーリングバーの図である。 ４……軸部、５……刃具 ６……中心盲穴、10,12……管状磁石 11……管状摺動体、14,23……ばね 15……棒状磁石、6a……円錐凹部 20……円錐コマ、21……鋼球 22……円板FIG. 1 is a vertical sectional view of an embodiment of the present invention, FIG. 2 is a relationship diagram of magnetic force and a gap, FIG. 3 is a vertical sectional view of another embodiment, and FIG.
5 and 5 are views of a conventional anti-vibration boring bar. 4 ... Shaft, 5 ... Blade 6 ... Center blind hole, 10, 12 ... Tubular magnet 11 ... Tubular sliding body, 14, 23 ... Spring 15 ... Rod magnet, 6a ... Conical recess 20 ... … Cone pieces, 21 …… Steel balls 22 …… Discs
Claims (2)
た中心盲穴（６）を削設し、該中心盲穴（６）の底中心
部（6a）と小面積で接触する制振子（20）を挿入し、該
制振子（20）に続いて互いに接触しうるように鋼球（2
1）と円板（22）とよりなる複数組を遊挿配列し、各接
触部を圧接するばね（23）を内蔵したことを特徴とする
防振ボーリングバー。1. A bobbin which has a central blind hole (6) closed on the side of a cutting tool (5) and which is in contact with the central bottom portion (6a) of the central blind hole (6) in a small area. 20) and insert the steel balls (2
An anti-vibration boring bar, characterized in that a plurality of sets consisting of 1) and a disc (22) are loosely inserted and arranged, and a spring (23) for press-contacting each contact portion is incorporated.
心部と小面積で接触する制振子を挿入し、該制振子に続
いて互いに接触しうるように鋼球と円板とよりなる複数
組を遊挿配列し、且つ接触部を圧接するばねを内蔵した
ことを特徴とする防振バー。2. A steel ball and a disk are inserted so that a vibration damper, which comes into contact with the central bottom portion of the central blind hole of the bar to which a vibration force is applied, comes into contact with the small area in a small area, and the vibration balls can be subsequently contacted with each other. An anti-vibration bar, characterized in that a plurality of sets of the above are loosely inserted and a spring for press-contacting the contact portion is built therein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1221303A JPH0796161B2 (en) | 1989-08-28 | 1989-08-28 | Anti-vibration boring bar and anti-vibration bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1221303A JPH0796161B2 (en) | 1989-08-28 | 1989-08-28 | Anti-vibration boring bar and anti-vibration bar |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0386404A JPH0386404A (en) | 1991-04-11 |
| JPH0796161B2 true JPH0796161B2 (en) | 1995-10-18 |
Family
ID=16764681
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1221303A Expired - Lifetime JPH0796161B2 (en) | 1989-08-28 | 1989-08-28 | Anti-vibration boring bar and anti-vibration bar |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0796161B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4552214B2 (en) * | 2000-09-05 | 2010-09-29 | エヌティーエンジニアリング株式会社 | Chatter prevention structure for work machines |
| JP6145915B2 (en) * | 2012-11-02 | 2017-06-14 | エヌティーエンジニアリング株式会社 | Chattering prevention structure of work machine and chattering prevention method thereby |
| US9764394B2 (en) * | 2014-04-07 | 2017-09-19 | Kennametal Inc. | Rotary cutting tool with increased stiffness and method of assembling same |
| US9586266B2 (en) | 2015-01-23 | 2017-03-07 | Kennametal Inc. | Toolholder with tunable passive vibration absorber assembly |
| US9993879B1 (en) | 2016-12-05 | 2018-06-12 | Kennametal Inc | Eddy current vibration absorber assembly for cutting tool |
| JP6544420B2 (en) * | 2017-12-15 | 2019-07-17 | マツダ株式会社 | Processing tool |
| CN114192855B (en) * | 2021-12-02 | 2023-04-18 | 北京航空航天大学 | Vibration reduction milling cutter |
| CN114643372B (en) * | 2022-04-01 | 2022-12-06 | 哈尔滨理工大学 | Friction type vibration damping boring bar |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4553884A (en) * | 1982-05-10 | 1985-11-19 | Kennametal Inc. | Boring tool and method of reducing vibrations therein |
-
1989
- 1989-08-28 JP JP1221303A patent/JPH0796161B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0386404A (en) | 1991-04-11 |
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