JP3638025B2 - Broaching tool for machining hard materials - Google Patents
Broaching tool for machining hard materials Download PDFInfo
- Publication number
- JP3638025B2 JP3638025B2 JP34996393A JP34996393A JP3638025B2 JP 3638025 B2 JP3638025 B2 JP 3638025B2 JP 34996393 A JP34996393 A JP 34996393A JP 34996393 A JP34996393 A JP 34996393A JP 3638025 B2 JP3638025 B2 JP 3638025B2
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- JP
- Japan
- Prior art keywords
- tool
- cutting
- cutting edge
- broaching tool
- present
- 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 - Fee Related
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Description
【０００１】
【産業上の利用分野】
本発明は加工物の内面加工または、外面加工において工作物を所定形状に切削加工するのに用いられ、とくにＨＲＣ３５〜５５相当の高硬度材を加工するのに用いられるブローチ工具に関するものである。
【０００２】
【従来の技術】
従来より高硬度材切削加工用のブローチ工具として専用のブローチ工具はなく、汎用的なブローチ工具の中で用途に使用していた。特に、その中で高硬度材に適用できるブローチ工具としては、特開昭６３−２２２１６号に開示されているようにＴｉＮ、ＴｉＣＮ等の硬質被膜を各切刃の側面、または、側面とすくい面を除く表面にコーティングを施した例がある。
さらに、特開昭６０−１４６６１８号に開示されているように、硬質材料製の同一形状の多数のチップをブローチ本体に長手方向に設けられた溝に配列し、該溝の底面から突出チップのねじ孔にボルトをねじ込んで各チップを本体に固定したスローアウェイ式のブローチ工具があった。
【０００３】
【発明が解決しようとする問題点】
しかしながら、これらブローチ工具は汎用途的なものであり、本願用途に示す高硬度材の切削においてチッピングを発生し易く、かつアブレシブな摩耗により寿命が短くなっていた。
また、被削材自体が調質されているため被削材の硬さ、切削取り代等にバラツキがあるため加工精度を得ることが困難であるという問題があった。
【０００４】
【本発明の目的】
本発明は以上の問題を解決するためになされたものであり、おもにＨＲＣ３５〜５５相当の高硬度材切削加工用に用いるブローチ工具を提供しようとするものである。
【０００５】
【問題を解決するための手段】
本発明は、上記の目的を達成するために、粉末高速度工具鋼又は超微粒子超硬合金からなる切刃部を有するブローチ工具において、該切刃は、ネジレを有し、そのスクイ角が−１８°以上−１０°以下であり、該切刃部に硬質被膜のコーティングを施し、ＨＲＣ３５〜５５相当の高硬度材加工用に用いることを特徴とする高硬度材加工用ブローチ工具である。
【０００６】
【作用】
切刃にネジレを有することにより、喰い付きや切れ味を良好にし、また硬質被膜のコーティングを施すことによって、摩擦係数を下げ、アブレシブ摩耗やチッピング等の異常摩耗を抑制することが可能となった。
さらに、工具材質に粉末高速度工具鋼または、超微粒子超硬合金を用いることにより上記との相乗効果によって、高硬度材加工において長寿命化が図れる。
なお、粉末高速度工具鋼を用いる場合、高合金粉末高速度工具鋼を用いた方がより一層長寿命化が図れる。
切刃のスクイ角を−１８゜未満にすると異常切削音を発生し切削不安定となるため満足する加工精度を得ることは困難であり、また３゜を越えるとくさび角が小さくなり、刃先強度が弱くなるため刃先の摩耗進行が速くなり、チッピングが発生し短寿命となるため切刃のスクイ角を−１８゜以上３゜以下に設定した。
ここで、高硬度材の切削において良好であることを示したが、ＳＳ４１００材、Ｓ５０Ｃ材等の機械構造用炭素鋼および焼鈍し鋼のような低硬度材においても良好な切削が可能であることはいうまでもない。
【０００７】
【実施例】
図１〜図３に本発明品の一実施例を示す。工具材質に超微粒子超硬合金（ヤング率５７０００Ｋｇ／ｍｍ２）を用い、かつＴｉＮ膜のコーティングを施したピッチ８ｍｍ、刃数３０枚刃、ねじれ角１０゜、すくい角−１０゜のサーフェスブローチである。図４に比較品と本発明品との切削データを示す。ここで比較品として、従来より使用されている溶製の高速度工具鋼を使用したすくい角６°のものにＴｉＮ膜をコーティングしたサーフェイスブローチを用いた。
被削材に機械構造用炭素鋼であるＳ５０Ｃ材に表面焼入れを行ったものを用い、表面硬さはＨＲＣ４９〜５０である。
本発明品では、工具材質およびコーティングの効果と切刃にねじれを有していることから切削抵抗の軽減を図ることができ、比較品の５倍もの工具寿命が得られた。
また、比較品は切削抵抗が大きく、本切削比較に示す高硬度被削材の場合、切削初期より切刃先端部においてチッピングが発生し、また、工具材質面から刃先の摩耗進行が早く、切削面が悪く、短寿命であった。
【０００８】
【発明の効果】
以上のように本発明によれば、ＨＲＣ３５〜５５相当の高硬度材のブローチ加工することが可能となり、かつ、チッピング等の異常摩耗も抑制でき工具寿命が向上するという効果を得ることができた。
【図面の簡単な説明】
【図１】図１は、本発明の主要部概略の斜視図である。
【図２】図２は、本発明の刃部の側面拡大図である。
【図３】図３は、従来品の刃部の側面拡大図である。
【図４】図４は、本発明品と従来品との比較を示す説明図である。
【符号の説明】
１ 本体
２ ネジレ角
３ ピッチ
４ スクイ角[0001]
[Industrial application fields]
The present invention relates to a broach tool that is used to cut a workpiece into a predetermined shape during inner surface processing or outer surface processing of a workpiece, and in particular, to process a high-hardness material corresponding to HRC35 to 55.
[0002]
[Prior art]
Conventionally, there is no dedicated broaching tool as a broaching tool for cutting a hard material, and it has been used for general purpose broaching tools. In particular, as a broaching tool that can be applied to a high hardness material, a hard coating such as TiN, TiCN or the like, as disclosed in JP-A-63-22216, or a side surface and a rake surface of each cutting edge. There is an example where the surface is coated except for.
Furthermore, as disclosed in Japanese Patent Laid-Open No. 60-146618, a large number of chips of the same shape made of a hard material are arranged in a groove provided in the longitudinal direction of the broach main body, and the protruding chip from the bottom surface of the groove is arranged. There was a throw-away type broach tool in which a bolt was screwed into a screw hole and each chip was fixed to the main body.
[0003]
[Problems to be solved by the invention]
However, these broach tools are in general use, tending to cause chipping in the cutting of high-hardness materials shown in the present application, and have a short life due to abrasive wear.
Further, since the work material itself is tempered, there is a problem that it is difficult to obtain machining accuracy because the work material has variations in hardness, cutting allowance, and the like.
[0004]
[Object of the present invention]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a broach tool used mainly for cutting a hard material equivalent to HRC 35 to 55.
[0005]
[Means for solving problems]
In order to achieve the above object, the present invention provides a broach tool having a cutting edge portion made of powder high-speed tool steel or ultrafine particle cemented carbide, wherein the cutting edge has a twist and its squeeze angle is − A broaching tool for machining a high hardness material, which is 18 ° or more and -10 ° or less, and is used for machining a high hardness material corresponding to HRC35 to 55 by coating the cutting edge portion with a hard coating.
[0006]
[Action]
By having a twist on the cutting edge, it is possible to improve the biting and sharpness, and by applying a hard coating, it is possible to reduce the coefficient of friction and suppress abnormal wear such as abrasive wear and chipping.
Furthermore, by using powder high-speed tool steel or ultrafine particle cemented carbide as the tool material, a long life can be achieved in the processing of high hardness materials due to a synergistic effect with the above.
When powder high-speed tool steel is used, the use of high alloy powder high-speed tool steel can further extend the life.
If the squeeze angle of the cutting edge is less than -18 °, abnormal cutting noise is generated and the cutting becomes unstable, so that it is difficult to obtain satisfactory machining accuracy. If it exceeds 3 °, the wedge angle becomes small and the cutting edge strength becomes small. Since the wear of the cutting edge becomes weaker, the wear progresses at the cutting edge, and chipping occurs, resulting in a short life.
Here, it has been shown that it is good in cutting high-hardness materials, but good cutting is possible even in low-hardness materials such as carbon steel for mechanical structures such as SS4100 material and S50C material and annealed steel. Needless to say.
[0007]
【Example】
1 to 3 show an embodiment of the product of the present invention. With a surface broach that uses an ultra-fine particle cemented carbide (Young's modulus 57000Kg / mm 2 ) as the tool material, and has a pitch of 8mm, a number of blades of 30 blades, a twist angle of 10 °, and a rake angle of -10 ° coated with a TiN film. is there. FIG. 4 shows cutting data of the comparative product and the product of the present invention. Here, as a comparative product, a surface broach in which a TiN film was coated on a rake angle of 6 ° using a melted high-speed tool steel conventionally used was used.
A material obtained by subjecting an S50C material, which is a carbon steel for machine structural use, to surface hardening is used as the work material, and the surface hardness is HRC49-50.
In the product of the present invention, the effect of the tool material and coating, and the cutting blade has a twist, the cutting resistance can be reduced, and a tool life five times longer than that of the comparative product was obtained.
In addition, the comparative product has a large cutting resistance, and in the case of the high-hardness work material shown in this cutting comparison, chipping occurs at the tip of the cutting edge from the beginning of cutting, and the wear progresses quickly from the tool material surface. The surface was bad and the life was short.
[0008]
【The invention's effect】
As described above, according to the present invention, it is possible to perform broaching of a hard material equivalent to HRC 35 to 55, and it is possible to obtain an effect of suppressing abnormal wear such as chipping and improving tool life. .
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of a main part of the present invention.
FIG. 2 is an enlarged side view of the blade portion of the present invention.
FIG. 3 is an enlarged side view of a conventional blade part.
FIG. 4 is an explanatory view showing a comparison between a product of the present invention and a conventional product.
[Explanation of symbols]
1
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34996393A JP3638025B2 (en) | 1993-12-28 | 1993-12-28 | Broaching tool for machining hard materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34996393A JP3638025B2 (en) | 1993-12-28 | 1993-12-28 | Broaching tool for machining hard materials |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07195228A JPH07195228A (en) | 1995-08-01 |
| JP3638025B2 true JP3638025B2 (en) | 2005-04-13 |
Family
ID=18407298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34996393A Expired - Fee Related JP3638025B2 (en) | 1993-12-28 | 1993-12-28 | Broaching tool for machining hard materials |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3638025B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4582729B2 (en) * | 1999-12-02 | 2010-11-17 | 株式会社不二越 | High-speed and high-precision broaching method |
| JP4582735B2 (en) * | 2000-04-10 | 2010-11-17 | 株式会社不二越 | Broaching method |
| US20070193030A1 (en) * | 2006-02-17 | 2007-08-23 | Gm Global Technology Operations, Inc. | Net formed gear member and method of manufacture |
-
1993
- 1993-12-28 JP JP34996393A patent/JP3638025B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07195228A (en) | 1995-08-01 |
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