JP2015155125A - Broach - Google Patents

Broach Download PDF

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JP2015155125A
JP2015155125A JP2014030500A JP2014030500A JP2015155125A JP 2015155125 A JP2015155125 A JP 2015155125A JP 2014030500 A JP2014030500 A JP 2014030500A JP 2014030500 A JP2014030500 A JP 2014030500A JP 2015155125 A JP2015155125 A JP 2015155125A
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cutting
broach
cut
blade groove
work material
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JP2014030500A
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JP6296283B2 (en
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達也 西野
Tatsuya Nishino
達也 西野
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Nachi Fujikoshi Corp
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Nachi Fujikoshi Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a broach capable of being applied even when a material to be cut is a material which is not cut easily and whose cutting length becomes longer relatively.
SOLUTION: Provided is a broach 1 in which a rear surface 4 forming a rear surface angle θ1 of a cutting blade 2 is positioned in front of a cutting direction when a surface F vertical to the cutting direction of the cutting blade 2 is reference. The rear surface angle θ1 of the cutting blade 2 may become a range of -1° to -89° when a direction of anticlockwise is positive (+) and a direction of clockwise is negative (-) with the surface F vertical to the cutting direction of the cutting blade 2 is reference.
COPYRIGHT: (C)2015,JPO&INPIT

Description

本発明は、被削材の溝入れ加工に用いられるブローチに関する。   The present invention relates to a broach used for grooving a work material.

複数の切刃から構成されるブローチには、一般的に被削材を切削した際に発生する切屑を収める刃溝が設けられている。刃溝は、切削方向の前方側に位置する切刃の背面と、刃溝底と、切削方向の後方側に位置する切刃のすくい面から構成されている。また、刃溝には背面と刃溝底との間には背面丸みと呼ばれるＲ部が、刃溝底とすくい面との間には刃溝底丸みと呼ばれるＲ部がそれぞれ形成されている。さらに、刃溝の形状は被削材への切込量と切削長から刃溝の容量に対して、切屑が刃溝内に収まるようにピッチ（切刃間の距離）と刃溝深さが設計される。   A broach composed of a plurality of cutting edges is generally provided with a blade groove for storing chips generated when a work material is cut. The blade groove is composed of a back surface of the cutting blade located on the front side in the cutting direction, a blade groove bottom, and a rake face of the cutting blade located on the rear side in the cutting direction. In addition, an R portion called roundness of the back surface is formed between the back surface and the bottom of the blade groove in the blade groove, and an R portion called roundness of the blade groove bottom is formed between the blade groove bottom and the rake face. Furthermore, the shape of the blade groove is determined by the pitch (distance between the cutting blades) and the depth of the blade groove so that the chips are contained within the blade groove, based on the amount of cut into the workpiece and the cutting length. Designed.

例えば、特許文献１では刃溝（同文献では切屑ポケットと記載）を２箇所に区分して、区分された２箇所の刃溝部分（同文献では第１のチップポケットおよび第２のチップポケットと記載されている）の境界には突条（突起）を設けたブローチが開示されている。このブローチは、切削加工時に発生する被削材の切屑を第１のチップポケットの曲面に沿わせた後に突起部分を利用してカールさせることで被削材を分断して、切屑の排出特性が向上することが説明されている。   For example, in Patent Document 1, a blade groove (described as a chip pocket in the same document) is divided into two parts, and two divided blade groove parts (in the same document, a first chip pocket and a second chip pocket) A broach provided with protrusions (protrusions) at the boundary of (described) is disclosed. This broach divides the work material by curling the work piece generated during the cutting process along the curved surface of the first chip pocket, and then curling it using the protruding portion. It is explained that it improves.

しかし、特許文献１に記載のブローチでは被削材が鋳鉄やアルミニウム等の比較的に軟質な材料の場合には切削性は確保しやすいが、被削材がニッケル基合金等に代表される、いわゆる難削材の場合には切屑が丸くまとまらずに刃溝に沿って伸びていく。そのために最終的には切屑と被削材とが互いに干渉して、切屑が被削材の表面に傷を付けるという問題があった。また、被削材が難削材の場合には、切屑がカールし難いので被削材と干渉した際に切屑が折れ曲がることもあり、刃溝内で切屑詰まりが発生する可能性もあった。 However, in the broach described in Patent Document 1, when the work material is a relatively soft material such as cast iron or aluminum, it is easy to ensure cutting performance, but the work material is represented by a nickel-based alloy or the like. In the case of so-called difficult-to-cut materials, the chips extend along the blade groove without being rounded. For this reason, there is a problem that the chips and the work material eventually interfere with each other, and the chips damage the surface of the work material. Further, when the work material is a difficult-to-cut material, the chips are difficult to curl, and therefore, the chips may be bent when interfering with the work material, which may cause clogging of the chips in the blade groove.

そこで、特許文献２に開示されているブローチは刃溝に段差部分を形成することで被削材が難削材であっても切削時に発生する切屑がカールして、刃溝に切屑が収容できて、切屑詰まりを防止できることが説明されている。 Therefore, the broach disclosed in Patent Document 2 forms a stepped portion in the blade groove, so that even if the work material is difficult to cut, the chips generated during cutting curl and the chips can be stored in the blade groove. It is described that chip clogging can be prevented.

特開平５−３０９５２１号公報JP-A-5-309521 特開昭６４−３４６０５号公報Japanese Unexamined Patent Publication No. 64-34605

しかし、特許文献２に開示されたブローチでは段差部分で被削材の切屑がカールするために刃溝の一部のみを使用して切屑を収容するので、通常のブローチの様に段差部分の無い刃溝の容積に比べて、切屑の収容量が少なくなる。そのため、切屑詰まりを防止するためには被削材の切削長に限界があり、切削長が比較的に長くなる被削材の切削加工には同文献２に開示されているブローチでは適用できないという問題があった。 However, in the broach disclosed in Patent Document 2, since the chip of the work material curls at the step portion, the chip is accommodated by using only a part of the blade groove, so there is no step portion as in a normal broach. Compared to the volume of the blade groove, the amount of chips contained is reduced. Therefore, in order to prevent chip clogging, there is a limit to the cutting length of the work material, and the broach disclosed in the same document 2 cannot be applied to the cutting work of a work material whose cutting length is relatively long. There was a problem.

そこで、本発明においては被削材が難削材であり、かつ切削長が比較的に長くなる場合であっても適用できるブローチを提供することを課題とする。   Accordingly, an object of the present invention is to provide a broach that can be applied even when the work material is a difficult-to-cut material and the cutting length is relatively long.

前述した課題を解決するために、本発明者は被削材が難削材の場合であっても、その切屑は刃溝を形成する曲面に沿って伸びていく特性を利用して、本発明は切刃の背面角を構成する背面が、切刃の切削方向に対して垂直な面を基準とした場合に切削方向の前方側に位置するように形成されているブローチとした。このブローチにより被削材が難削材の場合であっても、刃溝全体を利用してその切屑を強制的にカールさせる。また、請求項２に係る発明においては、切刃の背面角が−１°〜−８９°であるブローチとした。さらに、請求項３に係る発明においては、切刃の背面角が−６０°〜−８０°であるブローチとした。   In order to solve the problems described above, the present inventor utilizes the property that even when the work material is a difficult-to-cut material, the chips extend along the curved surface forming the blade groove. Is a broach formed so that the back surface constituting the back angle of the cutting edge is positioned on the front side in the cutting direction when a plane perpendicular to the cutting direction of the cutting edge is used as a reference. Even if the work material is a difficult-to-cut material by this broach, the chip is forcibly curled using the entire blade groove. Moreover, in the invention which concerns on Claim 2, it was set as the broach whose back angle of a cutting blade is -1 degree--89 degree. Furthermore, in the invention which concerns on Claim 3, it was set as the broach whose back angle of a cutting blade is -60 degrees--80 degrees.

本発明に係るブローチは切刃の背面角を構成する背面が切刃の切削方向に対して垂直な面を基準とした場合に切削方向の前方側に位置するように形成されることで、被削材が難削材の場合であっても刃溝全体を利用して切屑を強制的にカールさせるので、切削長が比較的に長い被削材であっても適用できるという効果を奏する。 The broach according to the present invention is formed so that the back surface constituting the back angle of the cutting edge is positioned on the front side in the cutting direction when the back surface is perpendicular to the cutting direction of the cutting edge. Even if the cutting material is a difficult-to-cut material, the chip is forcibly curled using the entire blade groove, so that the present invention can be applied even to a cutting material having a relatively long cutting length.

本発明の実施の形態の一例であるブローチ１を構成する切刃２付近の拡大断面図である。It is an expanded sectional view near cutting edge 2 which constitutes broach 1 which is an example of an embodiment of the invention. 本発明のブローチ１を用いて被削材Ｗ１を切削加工した時の模式断面図である。It is a schematic cross section when the workpiece W1 is cut using the broach 1 of the present invention. 従来のブローチ１１を用いて被削材Ｗ２を切削加工した時の模式断面図である。It is a schematic cross section when the work material W2 is cut using the conventional broach 11. 従来のブローチ１１を構成する切刃１２付近の拡大断面図である。It is an expanded sectional view near the cutting edge 12 constituting the conventional broach 11.

本発明の実施の形態の一例について図面を用いて説明する。図１は本発明の実施の形態の一例であるブローチ１を構成する切刃２付近の拡大断面図、図４は従来のブローチ１１を構成する切刃１２付近の拡大断面図である。 An example of an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an enlarged sectional view in the vicinity of a cutting blade 2 constituting a broach 1 as an example of an embodiment of the present invention, and FIG. 4 is an enlarged sectional view in the vicinity of a cutting blade 12 constituting a conventional broach 11.

本発明のブローチ１の切刃２は、図１に示すようにすくい面３と背面４との間に構成されており、背面４を構成する曲面と切刃２の切削方向（同図の左側方向）に対して垂直な面Ｆとのなす角度である背面角θ１が形成されている。従来のブローチ１１では、図４に示すようにブローチ１１の背面角θ２は、切刃１２の切削方向（同図の左側方向）に対して垂直な面Ｆを基準とした場合に背面１４が切削方向の後方側に位置するように形成されている。それに対して、本発明では切刃２の背面角θ１を構成する背面４は、切刃２の切削方向に対して垂直な面Ｆを基準とした場合に切削方向の前方側に位置するように形成されている。なお、本発明における背面角の大きさは、切刃の切削方向に対して垂直な面Ｆを基準として、反時計回りの方向を正（＋）とし、時計周りの方向を負（−）とする。 The cutting edge 2 of the broach 1 of the present invention is formed between a rake face 3 and a back face 4 as shown in FIG. 1, and the curved surface constituting the back face 4 and the cutting direction of the cutting edge 2 (the left side of the figure). A back surface angle θ1 that is an angle formed with the surface F perpendicular to (direction) is formed. In the conventional broach 11, as shown in FIG. 4, the back surface angle θ <b> 2 of the broach 11 is cut by the back surface 14 when the surface F is perpendicular to the cutting direction of the cutting blade 12 (left side direction in the figure). It is formed so as to be located on the rear side in the direction. On the other hand, in the present invention, the back surface 4 constituting the back angle θ1 of the cutting edge 2 is positioned on the front side in the cutting direction when the plane F perpendicular to the cutting direction of the cutting edge 2 is used as a reference. Is formed. The size of the back angle in the present invention is positive (+) in the counterclockwise direction and negative (−) in the clockwise direction with respect to the plane F perpendicular to the cutting direction of the cutting edge. To do.

次に、本発明のブローチ１および従来のブローチ１１を用いて、被削材Ｗ１、Ｗ２を切削加工した時の切屑状態を図２および図３を用いて説明する。図２は本発明のブローチ１を用いて被削材Ｗ１を切削加工した時の模式断面図、図３は従来のブローチ１１を用いて被削材Ｗ２を切削加工した時の模式断面図である。本発明のブローチ１を用いて被削材Ｗ１を切削加工すると、図２に示すように被削材Ｗ１の切屑Ｚ１は切刃２によって切削された後、すくい面３に沿って伸びていき、刃溝底５上を通過して背面４でカールされて、再びすくい面３から伸びていくように刃溝６内に収容される。   Next, the state of chips when the work materials W1 and W2 are cut using the broach 1 of the present invention and the conventional broach 11 will be described with reference to FIGS. 2 is a schematic cross-sectional view when the work material W1 is cut using the broach 1 of the present invention, and FIG. 3 is a schematic cross-sectional view when the work material W2 is cut using the conventional broach 11. . When the work material W1 is cut using the broach 1 of the present invention, the chips Z1 of the work material W1 are cut along the rake face 3 after being cut by the cutting blade 2, as shown in FIG. It passes over the blade groove bottom 5, is curled on the back surface 4, and is accommodated in the blade groove 6 so as to extend from the rake surface 3 again.

これに対して従来のブローチ１１を用いて被削材Ｗ２を切削加工すると、図３に示すように被削材Ｗ２の切屑Ｚ２は切刃１２によって切削された後、すくい面１３に沿って伸びていき、刃溝底１５上を通過するが、途中に設けられている段差Ｄによって、この位置で切屑Ｚ２はカールされて、再びすくい面１３から伸びていくように刃溝１６内に収容される。すなわち、切屑Ｚ２はカールされるものの刃溝１６の一部のみに収容されるので被削材Ｗ２の切削長には限界があり、従来のブローチ１１では所定の長さを超える切削長の被削材Ｗ２には対応できない。 On the other hand, when the workpiece W2 is cut using the conventional broach 11, the chips Z2 of the workpiece W2 are cut along the rake face 13 after being cut by the cutting edge 12, as shown in FIG. The chip Z2 is curled at this position by the step D provided in the middle, and is accommodated in the blade groove 16 so as to extend from the rake face 13 again. The That is, although the chip Z2 is curled but accommodated only in a part of the blade groove 16, the cutting length of the work material W2 has a limit, and the conventional broach 11 has a cutting length exceeding a predetermined length. It cannot cope with the material W2.

以上より、本発明のブローチは、切刃の背面角を構成する背面が、切刃の切削方向に対して垂直な面を基準とした場合に切削方向の前方側に位置するように形成されることで、被削材が難削材の場合であっても刃溝全体を利用して切屑を強制的にカールさせるので、切削長が比較的に長い被削材であっても切削加工を行うことができる。 As described above, the broach according to the present invention is formed such that the back surface constituting the back angle of the cutting edge is positioned on the front side in the cutting direction when a plane perpendicular to the cutting direction of the cutting edge is used as a reference. As a result, even if the work material is difficult to cut, the entire chip groove is used to forcibly curl the chips, so that cutting is performed even for work materials with a relatively long cutting length. be able to.

１ ブローチ
２ 切刃
４ 背面
Ｆ 切刃２の切削方向に対して垂直な面
θ１ 背面角 1 Broach 2 Cutting edge 4 Rear face F Surface perpendicular to the cutting direction of the cutting edge 2 θ 1 Rear angle

Claims (3)

切刃の背面角を構成する背面が、前記切刃の切削方向に対して垂直な面を基準とした場合に前記切削方向の前方側に位置するように形成されていることを特徴とするブローチ。 A broach characterized in that a back surface constituting a back angle of the cutting edge is formed so as to be positioned in front of the cutting direction when a plane perpendicular to the cutting direction of the cutting edge is used as a reference. . 前記切刃の背面角が、−１°〜−８９°であることを特徴とする請求項１に記載のブローチ。 The broach according to claim 1, wherein a back angle of the cutting blade is -1 ° to -89 °. 前記切刃の背面角が、−６０°〜−８０°であることを特徴とする請求項２に記載のブローチ。   The broach according to claim 2, wherein a back angle of the cutting blade is −60 ° to −80 °.
JP2014030500A 2014-02-20 2014-02-20 brooch Active JP6296283B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2018159268A1 (en) * 2017-03-02 2019-12-19 パナソニックＩｐマネジメント株式会社 Wavelength conversion member, light source and lighting device

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51142178A (en) * 1975-05-31 1976-12-07 Kobe Steel Ltd Broach
JPS5233778U (en) * 1975-09-01 1977-03-09
GB1569266A (en) * 1975-12-20 1980-06-11 Grinding Aids Ltd Cutting tool for a machine tool
WO1984002676A1 (en) * 1983-01-13 1984-07-19 Herbert Erhardt Saw blade
JPS60125021U (en) * 1984-02-03 1985-08-23 三菱重工業株式会社 brooch
JPS6142218U (en) * 1984-08-24 1986-03-18 株式会社神戸製鋼所 brooch
JPS6285323U (en) * 1985-11-18 1987-05-30
JPS6367020U (en) * 1986-10-22 1988-05-06
JPS6434605A (en) * 1987-07-27 1989-02-06 Mitsubishi Heavy Ind Ltd Cutting tool
JPH04189415A (en) * 1990-09-25 1992-07-07 Toshiba Tungaloy Co Ltd Turn broach tool
JPH05309521A (en) * 1992-05-11 1993-11-22 Toshiba Corp Broaching tool
JP2007301699A (en) * 2006-05-15 2007-11-22 Isuzu Motors Ltd Hob and grinding method of cutting blade of hob

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51142178A (en) * 1975-05-31 1976-12-07 Kobe Steel Ltd Broach
JPS5233778U (en) * 1975-09-01 1977-03-09
GB1569266A (en) * 1975-12-20 1980-06-11 Grinding Aids Ltd Cutting tool for a machine tool
WO1984002676A1 (en) * 1983-01-13 1984-07-19 Herbert Erhardt Saw blade
JPS60125021U (en) * 1984-02-03 1985-08-23 三菱重工業株式会社 brooch
JPS6142218U (en) * 1984-08-24 1986-03-18 株式会社神戸製鋼所 brooch
JPS6285323U (en) * 1985-11-18 1987-05-30
JPS6367020U (en) * 1986-10-22 1988-05-06
JPS6434605A (en) * 1987-07-27 1989-02-06 Mitsubishi Heavy Ind Ltd Cutting tool
JPH04189415A (en) * 1990-09-25 1992-07-07 Toshiba Tungaloy Co Ltd Turn broach tool
JPH05309521A (en) * 1992-05-11 1993-11-22 Toshiba Corp Broaching tool
JP2007301699A (en) * 2006-05-15 2007-11-22 Isuzu Motors Ltd Hob and grinding method of cutting blade of hob

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2018159268A1 (en) * 2017-03-02 2019-12-19 パナソニックＩｐマネジメント株式会社 Wavelength conversion member, light source and lighting device

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