JP2016059969A - Cutting tool - Google Patents

Cutting tool Download PDF

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JP2016059969A
JP2016059969A JP2014186976A JP2014186976A JP2016059969A JP 2016059969 A JP2016059969 A JP 2016059969A JP 2014186976 A JP2014186976 A JP 2014186976A JP 2014186976 A JP2014186976 A JP 2014186976A JP 2016059969 A JP2016059969 A JP 2016059969A
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cutting tool
holder
guide pad
inner peripheral
cutting
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JP6357998B2 (en
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上久保　俊孝
Toshitaka Kamikubo
俊孝 上久保
里司 朝倉
Satoji Asakura
里司 朝倉
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Toyota Motor Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a cutting tool that can improve cutting diameter accuracy and circularity accuracy.SOLUTION: A cutting tool 1 according to one embodiment, which is inserted into a hole 105a formed in an object 105 to be cut, and cuts an inner peripheral face 105a1 of the hole 105a, comprises: a rotary driving holder 2; a blade tool 3, provided in the holder 2, which cuts the inner peripheral face 105a1 of the object 105 to be cut; and a guide pad 4, provided in the holder 2, which slidably contacts the inner peripheral face 105a1 of the object 105 to be cut. The guide pad 4 has a first part 4a and a second part 4b whose width dimensions in a rotating direction of the cutting tool 1 are different. The first part 4a is arranged near an insertion direction into the object 105 to be cut in the cutting tool 1 relative to the second part 4b, and is larger in width dimension than the second part 4b.SELECTED DRAWING: Figure 1

Description

本発明は、切削工具に関する。   The present invention relates to a cutting tool.

切削工具は、例えば被切削物に形成された穴に挿入され、当該穴の内周面を切削するために用いられている。ここで、図５は、従来の切削工具を模式的に示す斜視図である。また、図６は、従来の切削工具を模式的に示す底面図である。   For example, the cutting tool is inserted into a hole formed in an object to be cut, and is used to cut the inner peripheral surface of the hole. Here, FIG. 5 is a perspective view schematically showing a conventional cutting tool. FIG. 6 is a bottom view schematically showing a conventional cutting tool.

図５及び図６に示すように、従来の切削工具１０１は、ホルダ１０２に刃具１０３が取り付けられており、さらにホルダ１０２の周方向に複数のガイドパッド１０４が取り付けられている（特許文献１を参照）。   As shown in FIGS. 5 and 6, in the conventional cutting tool 101, a blade 103 is attached to a holder 102, and a plurality of guide pads 104 are attached in the circumferential direction of the holder 102 (see Patent Document 1). reference).

このとき、ホルダ１０２の中心Ｏから刃具１０３の先端までの半径ｒＴとホルダ１０２の中心Ｏからガイドパッド１０４の外周面までの半径ｒＧとの差（ｒＴ−ｒＧ）を限りなく小さくし、切削時の刃具１０３の振れ量をガイドすることで切削径及び真円度の精度を向上させている。   At this time, the difference (rT−rG) between the radius rT from the center O of the holder 102 to the tip of the cutting tool 103 and the radius rG from the center O of the holder 102 to the outer peripheral surface of the guide pad 104 is reduced as much as possible. The accuracy of the cutting diameter and roundness is improved by guiding the amount of deflection of the cutting tool 103.

特開２００１−２５２８０４号公報JP 2001-252804 A

従来の切削工具１０１は、穴の内周面が窪みのない連続面の場合は、連続切削となり、特に問題なく切削することができる。しかし、図７に示すように、被切削物１０５の穴１０５ａの内周面１０５ａ１が当該内周面１０５ａ１に外周方向へ窪む段差部１０５ａ２が形成された断続面の場合、刃具１０３が段差部１０５ａ２に落ち込み、切削径や真円度の精度が悪化する。   In the case of the conventional cutting tool 101, when the inner peripheral surface of the hole is a continuous surface having no depression, continuous cutting is performed, and cutting can be performed without any particular problem. However, as shown in FIG. 7, when the inner peripheral surface 105 a 1 of the hole 105 a of the workpiece 105 is an intermittent surface in which a step portion 105 a 2 that is recessed in the outer peripheral direction is formed on the inner peripheral surface 105 a 1, the cutting tool 103 is the step portion. The accuracy falls to 105a2, and the accuracy of the cutting diameter and roundness deteriorates.

また、ガイドパッド１０４が段差部１０５ａ２に落ち込むと、本来のガイドの役割であるホルダ１０２の振れ防止ができず、やはり切削径や真円度の精度が悪化する。   Further, when the guide pad 104 falls into the stepped portion 105a2, it is impossible to prevent the holder 102 from swinging as an original guide, and the accuracy of the cutting diameter and the roundness is deteriorated.

本発明は、このような問題点を解決するためになされたものであり、切削径や真円度の精度を向上させることができる切削工具を提供する。   The present invention has been made to solve such problems, and provides a cutting tool capable of improving the accuracy of the cutting diameter and roundness.

本発明の一形態に係る切削工具は、
被切削物に形成された穴に挿入され、前記穴の内周面を切削する切削工具であって、
回転駆動するホルダと、
前記ホルダに設けられ、前記被切削物の内周面を切削する刃具と、
前記ホルダに設けられ、前記被切削物の内周面に摺接するガイドパッドと、を備え、
前記ガイドパッドは、前記切削工具の回転方向の幅寸法が異なる第１の部分と第２の部分とを有し、
前記第１の部分は、前記第２の部分に対して前記切削工具における前記被切削物への挿入方向側に配置されており、前記第２の部分に対して前記幅寸法が広い。
これにより、被切削物の穴に段差部が形成されていても、当該段差部にガイドパッドが落ち込むことを抑制できる。そのため、刃具の振れ量を良好にガイドすることができ、切削径及び真円度の精度を向上させることができる。 A cutting tool according to one aspect of the present invention is:
A cutting tool that is inserted into a hole formed in a workpiece and cuts the inner peripheral surface of the hole,
A rotary drive holder;
A cutting tool provided on the holder for cutting an inner peripheral surface of the workpiece;
A guide pad provided on the holder and in sliding contact with the inner peripheral surface of the workpiece,
The guide pad has a first portion and a second portion having different width dimensions in the rotational direction of the cutting tool,
The first part is disposed on the cutting tool insertion direction side of the cutting tool with respect to the second part, and the width dimension is wider than the second part.
Thereby, even if the step part is formed in the hole of the workpiece, the guide pad can be prevented from falling into the step part. Therefore, the amount of deflection of the cutting tool can be guided well, and the accuracy of the cutting diameter and roundness can be improved.

以上、説明したように、切削径や真円度の精度を向上させることができる切削工具を提供することができる。   As described above, it is possible to provide a cutting tool capable of improving the accuracy of the cutting diameter and roundness.

実施の形態１の切削工具を模式的に示す斜視図である。It is a perspective view which shows the cutting tool of Embodiment 1 typically. 実施の形態１の切削工具を模式的に示す底面図である。It is a bottom view which shows typically the cutting tool of Embodiment 1. FIG. 実施の形態１の切削工具のガイドパッドを模式的に示す斜視図である。It is a perspective view which shows typically the guide pad of the cutting tool of Embodiment 1. FIG. 実施の形態２の切削工具を模式的に示す斜視図である。It is a perspective view which shows typically the cutting tool of Embodiment 2. FIG. 従来の切削工具を模式的に示す斜視図である。It is a perspective view which shows the conventional cutting tool typically. 従来の切削工具を模式的に示す底面図である。It is a bottom view which shows the conventional cutting tool typically. 切削工具で切削される内周面を説明するための図である。It is a figure for demonstrating the internal peripheral surface cut with a cutting tool.

以下、本発明を実施するための最良の形態について、添付図面を参照しながら説明する。但し、本発明が以下の実施の形態に限定される訳ではない。また、説明を明確にするため、以下の記載及び図面は、適宜、簡略化されている。但し、以下の説明では、回転駆動機構に連結される側を上側として説明するが、切削工具の使用形態によって方向は適宜変更される。   The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. However, the present invention is not limited to the following embodiment. In addition, for clarity of explanation, the following description and drawings are simplified as appropriate. However, in the following description, the side connected to the rotational drive mechanism is described as the upper side, but the direction is appropriately changed depending on the usage of the cutting tool.

＜実施の形態１＞
先ず、本実施の形態の切削工具の基本構成を説明する。図１は、本実施の形態の切削工具を模式的に示す斜視図である。図２は、本実施の形態の切削工具を模式的に示す底面図である。 <Embodiment 1>
First, the basic configuration of the cutting tool of the present embodiment will be described. FIG. 1 is a perspective view schematically showing the cutting tool of the present embodiment. FIG. 2 is a bottom view schematically showing the cutting tool of the present embodiment.

図１及び図２に示すように、切削工具１は、ホルダ２、刃具３及びガイドパッド４を備えている。このような切削工具１は、図７に示されるような被切削物１０５に形成された穴１０５ａに挿入され、当該穴１０５ａの内周面１０５ａ１を切削するために好適である。   As shown in FIGS. 1 and 2, the cutting tool 1 includes a holder 2, a cutting tool 3, and a guide pad 4. Such a cutting tool 1 is suitable for being inserted into a hole 105a formed in the workpiece 105 as shown in FIG. 7 and cutting the inner peripheral surface 105a1 of the hole 105a.

ホルダ２は、図１及び図２に示すように、略円柱形状を基本形態とし、例えば上部が回転駆動機構（図示を省略）に連結される。但し、ホルダ２の形状は、例えば水平断面が多角形状でもよい。また、ホルダ２の材質は、当該回転駆動機構の駆動力を良好に刃具３に伝達することができる材質であればよい。   As shown in FIGS. 1 and 2, the holder 2 has a substantially cylindrical shape as a basic form, and an upper portion is connected to a rotation drive mechanism (not shown), for example. However, the holder 2 may have a polygonal horizontal cross section, for example. Moreover, the material of the holder 2 should just be a material which can transmit the driving force of the said rotational drive mechanism to the blade tool 3 favorably.

刃具３は、図１及び図２に示すように、ホルダ２の径方向及び下方に当該ホルダ２から突出するように、ホルダ２の下端部に取り付けられている。なお、本実施の形態では、一つの刃具３がホルダ２に取り付けられているが、複数の刃具３がホルダ２の周方向に取り付けられてもよい。   As shown in FIGS. 1 and 2, the cutting tool 3 is attached to the lower end portion of the holder 2 so as to protrude from the holder 2 in the radial direction and downward of the holder 2. In the present embodiment, one blade 3 is attached to the holder 2, but a plurality of blades 3 may be attached in the circumferential direction of the holder 2.

ガイドパッド４は、ホルダ２の径方向に当該ホルダ２から突出するように、ホルダ２の下端部に取り付けられている。そして、ガイドパッド４の外周面は、切削工具１の上下方向から見て円弧形状とされており、その円弧の中心はホルダ２の中心Ｏである。   The guide pad 4 is attached to the lower end portion of the holder 2 so as to protrude from the holder 2 in the radial direction of the holder 2. The outer peripheral surface of the guide pad 4 has an arc shape when viewed from the vertical direction of the cutting tool 1, and the center of the arc is the center O of the holder 2.

このとき、切削工具１を被切削物１０５の穴１０５ａに挿入する際に先ず刃具３が被切削物１０５に接触するように、刃具３の下端部より上方にガイドパッド４が配置されている。そして、ガイドパッド４におけるホルダ２からの突出量は、刃具３におけるホルダ２からの突出量より若干少ない。本実施の形態では、このようなガイドパッド４がホルダ２の周方向に略等しい間隔で複数配置されている。   At this time, when the cutting tool 1 is inserted into the hole 105 a of the workpiece 105, the guide pad 4 is disposed above the lower end portion of the cutting tool 3 so that the cutting tool 3 first contacts the workpiece 105. The amount of protrusion of the guide pad 4 from the holder 2 is slightly smaller than the amount of protrusion of the cutting tool 3 from the holder 2. In the present embodiment, a plurality of such guide pads 4 are arranged at substantially equal intervals in the circumferential direction of the holder 2.

次に、本実施の形態の切削工具のガイドパッドを説明する。図３は、本実施の形態の切削工具のガイドパッドを模式的に示す斜視図である。   Next, the guide pad of the cutting tool of the present embodiment will be described. FIG. 3 is a perspective view schematically showing a guide pad of the cutting tool of the present embodiment.

図３に示すように、ガイドパッド４は、第１の部分４ａ及び第２の部分４ｂを備えている。第１の部分４ａは、第２の部分４ｂに対して切削工具１の下方に配置される。そして、第１の部分４ａにおける切削工具１の回転方向の幅寸法Ｔ１が、第２の部分４ｂにおける切削工具１の回転方向の幅寸法Ｔ２に比べて広い。   As shown in FIG. 3, the guide pad 4 includes a first portion 4a and a second portion 4b. The first portion 4a is disposed below the cutting tool 1 with respect to the second portion 4b. The width dimension T1 in the rotation direction of the cutting tool 1 in the first portion 4a is wider than the width dimension T2 in the rotation direction of the cutting tool 1 in the second portion 4b.

例えば、第１の部分４ａの幅寸法Ｔ１は、被切削物１０５の穴１０５ａの内周面１０５ａ１に形成された段差部１０５ａ２の幅寸法より広く設定され、第２の部分４ｂの幅寸法Ｔ２は、従来のガイドパッドにおける切削工具の回転方向の幅寸法と略等しく設定される。   For example, the width dimension T1 of the first portion 4a is set wider than the width dimension of the step portion 105a2 formed on the inner peripheral surface 105a1 of the hole 105a of the workpiece 105, and the width dimension T2 of the second portion 4b is The width dimension in the rotational direction of the cutting tool in the conventional guide pad is set to be approximately equal.

このようなガイドパッド４は、図１及び図３に示すように、切削工具１の側面視において略逆Ｔ字形状であり、切削工具１の回転方向の幅寸法が広い部分を有するので、被切削物１０５の穴１０５ａの内周面１０５ａ１に段差部１０５ａ２が形成されていても、当該段差部１０５ａ２にガイドパッド４が落ち込むことを抑制できる。そのため、刃具３の振れ量を良好にガイドすることができ、切削径及び真円度の精度を向上させることができる。   As shown in FIGS. 1 and 3, such a guide pad 4 has a substantially inverted T shape in a side view of the cutting tool 1 and has a portion with a wide width in the rotational direction of the cutting tool 1, Even if the stepped portion 105a2 is formed on the inner peripheral surface 105a1 of the hole 105a of the cut object 105, the guide pad 4 can be prevented from falling into the stepped portion 105a2. Therefore, the amount of deflection of the cutting tool 3 can be guided well, and the accuracy of the cutting diameter and roundness can be improved.

しかも、本実施の形態のガイドパッド４は、全てを幅広の部分で構成せず、ガイドパッド４の下側部分のみを幅広に形成したので、全てを幅広の部分で構成した場合に比べてガイドパッド４の重量が低減し、それに伴い遠心力が低減し、ガイドパッド４が外周方向へ広がり難くなる。その結果、ガイドパッド４と被切削物１０５の穴１０５ａの内周面１０５ａ１とが接触せず、被切削物の形状が保たれるので、切削径及び真円度の精度の悪化を抑制することができる。   In addition, the guide pad 4 of the present embodiment is not composed entirely of a wide portion, and only the lower portion of the guide pad 4 is formed wide. Therefore, the guide pad 4 is guided as compared with the case where all are composed of a wide portion. The weight of the pad 4 is reduced, and accordingly, the centrifugal force is reduced, and the guide pad 4 is difficult to spread in the outer peripheral direction. As a result, the guide pad 4 and the inner peripheral surface 105a1 of the hole 105a of the workpiece 105 are not in contact with each other, and the shape of the workpiece is maintained, so that deterioration of the accuracy of the cutting diameter and roundness is suppressed. Can do.

ちなみに、第１の部分４ａの高さＨ１及び第２の部分４ｂの高さＨ２は、穴１０５ａの高さなどに応じて適宜設定される。   Incidentally, the height H1 of the first portion 4a and the height H2 of the second portion 4b are appropriately set according to the height of the hole 105a and the like.

＜実施の形態２＞
実施の形態１では、複数個のガイドパッド４をホルダ２の周方向に配置したが、この限りでない。図４は、本実施の形態の切削工具を模式的に示す斜視図である。 <Embodiment 2>
In the first embodiment, the plurality of guide pads 4 are arranged in the circumferential direction of the holder 2, but this is not restrictive. FIG. 4 is a perspective view schematically showing the cutting tool of the present embodiment.

図４に示すように、本実施の形態の切削工具２１は、ホルダ２の周方向の全域に連続するガイドパッド２２がホルダ２に取り付けられている。これにより、実施の形態１と同様に、被切削物１０５の穴１０５ａの内周面１０５ａ１に段差部１０５ａ２が形成されていても、当該段差部１０５ａ２にガイドパッド２２が落ち込むことを抑制できる。そのため、刃具３の振れ量を良好にガイドすることができ、切削径及び真円度の精度を向上させることができる。   As shown in FIG. 4, in the cutting tool 21 of the present embodiment, a guide pad 22 that is continuous over the entire circumferential direction of the holder 2 is attached to the holder 2. Thereby, similarly to Embodiment 1, even if the level | step-difference part 105a2 is formed in the internal peripheral surface 105a1 of the hole 105a of the to-be-cut object 105, it can suppress that the guide pad 22 falls into the said level | step-difference part 105a2. Therefore, the amount of deflection of the cutting tool 3 can be guided well, and the accuracy of the cutting diameter and roundness can be improved.

以上、本発明の実施の形態を説明したが、上記に限らず、本発明の技術的思想を逸脱しない範囲で、変更することが可能である。   The embodiment of the present invention has been described above. However, the present invention is not limited to the above, and can be changed without departing from the technical idea of the present invention.

１ 切削工具
２ ホルダ
３ 刃具
４ ガイドパッド、４ａ 第１の部分、４ｂ 第２の部分
２１ 切削工具
２２ ガイドパッド
１０１ 切削工具
１０２ ホルダ
１０３ 刃具
１０４ ガイドパッド
１０５ 被切削物、１０５ａ 穴、１０５ａ１ 内周面、１０５ａ２ 段差部
Ｏ ホルダの中心 DESCRIPTION OF SYMBOLS 1 Cutting tool 2 Holder 3 Cutting tool 4 Guide pad, 4a 1st part, 4b 2nd part 21 Cutting tool 22 Guide pad 101 Cutting tool 102 Holder 103 Cutting tool 104 Guide pad 105 Workpiece, 105a Hole, 105a1 Inner peripheral surface 105a2 Stepped portion O Center of holder

Claims (1)

被切削物に形成された穴に挿入され、前記穴の内周面を切削する切削工具であって、
回転駆動するホルダと、
前記ホルダに設けられ、前記被切削物の内周面を切削する刃具と、
前記ホルダに設けられ、前記被切削物の内周面に摺接するガイドパッドと、を備え、
前記ガイドパッドは、前記切削工具の回転方向の幅寸法が異なる第１の部分と第２の部分とを有し、
前記第１の部分は、前記第２の部分に対して前記切削工具における前記被切削物への挿入方向側に配置されており、前記第２の部分に対して前記幅寸法が広い切削工具。 A cutting tool that is inserted into a hole formed in a workpiece and cuts the inner peripheral surface of the hole,
A rotary drive holder;
A cutting tool provided on the holder for cutting an inner peripheral surface of the workpiece;
A guide pad provided on the holder and in sliding contact with the inner peripheral surface of the workpiece,
The guide pad has a first portion and a second portion having different width dimensions in the rotational direction of the cutting tool,
The first part is a cutting tool that is disposed on the cutting tool insertion direction side of the cutting tool with respect to the second part, and has a wider width dimension than the second part.
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JPH0199518U (en) * 1987-12-22 1989-07-04
JPH0475811A (en) * 1990-07-17 1992-03-10 Toshiba Tungaloy Co Ltd Drilling tool
US5328304A (en) * 1992-01-31 1994-07-12 Mapal Fabrik Fur Prazisionswerkzeuge Dr. Kress Kg Reamer
JP2008168393A (en) * 2007-01-12 2008-07-24 Sumitomo Electric Hardmetal Corp Boring tool
US20130309029A1 (en) * 2010-11-05 2013-11-21 Botek Praezisionsbohrtechnik Gmbh Single-lip drill
WO2013182810A1 (en) * 2012-06-05 2013-12-12 Snecma Calibration head for the drilling of shafts

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58165910A (en) * 1982-03-23 1983-10-01 Daido Kogyo Kk Trepanning head
JPH0199518U (en) * 1987-12-22 1989-07-04
JPH0475811A (en) * 1990-07-17 1992-03-10 Toshiba Tungaloy Co Ltd Drilling tool
US5328304A (en) * 1992-01-31 1994-07-12 Mapal Fabrik Fur Prazisionswerkzeuge Dr. Kress Kg Reamer
JP2008168393A (en) * 2007-01-12 2008-07-24 Sumitomo Electric Hardmetal Corp Boring tool
US20130309029A1 (en) * 2010-11-05 2013-11-21 Botek Praezisionsbohrtechnik Gmbh Single-lip drill
WO2013182810A1 (en) * 2012-06-05 2013-12-12 Snecma Calibration head for the drilling of shafts

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