JP2006082215A

JP2006082215A - Cutting tool

Info

Publication number: JP2006082215A
Application number: JP2004302169A
Authority: JP
Inventors: Toshio Tsutsui; 敏夫筒井
Original assignee: TSUTSUI SEIKEN KK
Current assignee: TSUTSUI SEIKEN KK
Priority date: 2004-09-14
Filing date: 2004-09-14
Publication date: 2006-03-30

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the fixing and holding force of the cutter of a cutting tool at the cutter fitting hole of the shank to improve accuracy reliability more. <P>SOLUTION: In the cutting tool whose cutter fitting hole 3 opening on the top of the end face 1a of the shank 1 is inserted with the fixing part 21 of the cutter 2 and depressed and fixed by lock screws 6, the predetermined area including the part corresponding to the lock screws 6 in the circumference in the inner wall face of the cutter fitting hole 3 comprises a plate body 5 integrated in the shank 1 to receive the depressing force of the lock screws 6 to displace toward inside the cutter fitting hole 3. This structure can displace the plate body 5 inside the cutter fitting hole 3 by the depressing force of the lock screws 6, contacts almost all the face with the front face of the fixing part 21 of the cutter 2, moves the cutter 2 forward in the depressing direction, depresses the forward face to the inner face of the cutter fitting hole 3, lets frictional force work to both front and forward side faces of the fixing part 21 of the cutter 2, enhances the fixing and holding force of the cutter 2 to the cutter fitting hole 3, ensures prevention of the cutter 2 from displacing, and improves accuracy reliability of the cutting tool more. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

Technology field

本願発明は、シャンクの先端部に刃物を取り付けて構成され、該シャンクの軸心回りに回転駆動されることで上記刃物により所要の切削加工を行なうようにした切削工具に関するものである。 The present invention relates to a cutting tool that is configured by attaching a blade to the tip of a shank, and that is driven to rotate around the axis of the shank so that the cutting tool performs the required cutting.

例えば、ドリル、エンドミル等のシャンクの軸心回りに回転駆動される切削工具においては、従来は切削工具全体を超硬合金、サーメット、セラミック等の超硬質材で一体形成していたが、これら超硬質材は素材としては極めて高価であることから、切削工具の低コスト化という観点から、切削工具を、シャンクとその先端部に取り付けられる刃物とからなる二分割構成とし、上記シャンクはこれを軟鋼等の一般鋼材で構成し、上記刃物のみを超硬質材で構成することが提案されており、その一つに、本件出願人の出願に係る切削工具がある（特許文献１参照）。 For example, in cutting tools that are rotationally driven around the shaft center of a shank, such as a drill or end mill, conventionally, the entire cutting tool has been integrally formed of a super hard material such as cemented carbide, cermet, or ceramic. Since hard materials are extremely expensive as materials, from the viewpoint of reducing the cost of cutting tools, the cutting tool is divided into two parts consisting of a shank and a blade attached to the tip of the shank. It is proposed to make only the above-mentioned blade with a super hard material, and one of them is a cutting tool according to the applicant's application (see Patent Document 1).

この特許文献１に示される切削工具では、シャンクの先端部に設けた刃物嵌着孔に板状形体をもつ刃物の基部を嵌挿し、上記シャンクの外周面から上記刃物嵌着孔に向けて取り付けたビスによって、上記刃物の基部を該刃物嵌着孔の長辺側の壁面に押圧し、これら両者間に作用する摩擦力で上記刃物２を上記シャンク１該に固定保持するようにしている。
さらに、上記刃物の取り付け状態において、上記シャンクの軸心と上記刃物の軸心が合致していることが要求されることから、上記刃物嵌着孔の一方の短辺側に、上記刃物を他方の短辺側の壁面へ押し付けて該刃物の位置決めを行うためのバネ状の付勢体を設けている。In the cutting tool disclosed in Patent Document 1, a base of a blade having a plate-like shape is inserted into a blade fitting hole provided at the tip of the shank, and is attached from the outer peripheral surface of the shank toward the blade fitting hole. The base of the blade is pressed against the long side wall of the blade fitting hole by a screw, and the blade 2 is fixedly held on the shank 1 by a frictional force acting between them.
Further, since the shank axis and the cutter axis are required to match in the attached state of the cutter, the cutter is placed on one short side of the cutter fitting hole. A spring-like urging body is provided for positioning the blade by pressing against the wall surface on the short side.

特開２００４−５８１７１号公報（段落「０００２」、「０００９」〜「００１１」、図１〜図３）。JP 2004-58171 A (paragraphs “0002”, “0009” to “0011”, FIGS. 1 to 3).

ところで、この特許文献１に示される切削工具では、上記刃物嵌着孔に上記付勢体を設けているものの、該付勢体がバネ状であって、上記刃物側から過大な力が掛けられると弾性変形し得るものである。 By the way, in the cutting tool shown by this patent document 1, although the said urging | biasing body is provided in the said blade fitting hole, this urging | biasing body is spring shape and an excessive force is applied from the said blade side. It can be elastically deformed.

また、上記刃物は、上記ビスの押圧力で上記刃物嵌着孔の長辺側の壁面に押し付けられ、この面との間に作用する摩擦力で固定保持されているが、上記ビス側においては該ビスと上記刃物の基部とが点接触に近い小さい面積で接触していることから、ここに作用する摩擦力は比較的小さなものに止まり、しかも上記ビスを締め込んでも上記刃物は超硬質材で構成されているので上記ビスの先端が上記刃物側に食い込んでこれら両者間のせん断抵抗となることはなく、結果的に、上記刃物の固定保持力は、上記刃物嵌着孔の長辺側の壁面との間に作用する摩擦力に依存することになる。この場合、上記摩擦力は通常の切削工具使用状態において該刃物を固定保持するに十分な大きさに設定されるため、通常の切削工具使用状態においては何等問題を生じることはない。 Further, the cutter is pressed against the wall surface on the long side of the cutter fitting hole by the pressing force of the screw, and is fixed and held by the frictional force acting between the surfaces. On the screw side, Since the screw and the base of the blade are in contact with each other in a small area close to a point contact, the frictional force acting on the screw is relatively small, and even if the screw is tightened, the blade is an ultra-hard material. Therefore, the tip of the screw does not bite into the cutting tool side to become a shear resistance between them. As a result, the fixed holding force of the cutting tool is the long side of the cutting tool fitting hole. It depends on the frictional force acting between the wall surface and the wall surface. In this case, since the frictional force is set to a magnitude sufficient to fix and hold the blade in a normal cutting tool use state, no problem occurs in a normal cutting tool use state.

しかし、切削工具を実際に使用する場合を考えると、適切な作業状態の下で切削工具が使用されるのが殆どであるが、極めて稀なケースではあるが、不適切な作業状態の下で使用されることが無いとは言えない。例えば、切削作業の準備段階において、誤って刃物をその側部から他の機材等に衝突させてしまったような場合とか、切削作業中において誤って上記刃物の側方への送り速度を極めて過大に設定してしまったような場合には、上記刃物に対して、これを上記刃物嵌着孔の長軸方向に変位させる方向の過大な力が作用し、その結果、上記刃物が、上記摩擦力による上記刃物の固定保持力に抗して、上記付勢体を弾性変形させながら上記刃物嵌着孔の長軸方向へズレを生じるということが考えられる。 However, considering the actual use of a cutting tool, the cutting tool is mostly used under an appropriate working condition, but in an extremely rare case, under an inappropriate working condition. It cannot be said that it is never used. For example, when the cutting tool is accidentally collided with other equipment from its side during the cutting work preparation stage, the feed speed to the side of the cutting tool is excessively increased during the cutting work. In such a case, an excessive force in the direction of displacing the blade in the long axis direction of the blade fitting hole acts on the blade, and as a result, the blade has the friction. It is conceivable that a deviation occurs in the major axis direction of the blade fitting hole while elastically deforming the urging body against the fixed holding force of the blade by force.

このようなケースは、上述のように、本来的に有り得ないものであるものの、これを完全に否定することはできないことから、切削工具の精度上の信頼性の確保という観点からは、看過すべきではないと考える。 Such a case is inherently impossible as described above, but cannot be completely denied, so it is overlooked from the viewpoint of ensuring the reliability of the accuracy of the cutting tool. I don't think it should.

そこで、本願発明では、極めて稀なケースへの対応ではあるが、シャンクの刃物嵌着孔に対する刃物の固定保持力を高め、精度上の信頼性の更なる向上を図り得るようにした切削工具を提供することを目的としてなされたものである。 Therefore, in the present invention, although it is a response to an extremely rare case, there is provided a cutting tool capable of increasing the fixing and holding force of the blade with respect to the blade insertion hole of the shank and further improving the reliability in accuracy. It was made for the purpose of providing.

本願発明ではかかる課題を解決するための具体的手段として次のような構成を採用している。 In the present invention, the following configuration is adopted as a specific means for solving such a problem.

本願の第１の発明では、軸心回りに回転駆動されるシャンク１の先端面１ａ上に開口する刃物嵌着孔３に刃物２の固定部２１を嵌挿し、該固定部２１を上記シャンク１の外周面１ｂ上に設けられた固定ビス６によって押圧固定してなる切削工具において、上記刃物嵌着孔３の内壁面のうち、その周方向において上記固定ビス６に対応する部分を含む所定範囲を、上記シャンク１と一体的に形成され且つ上記固定ビス６の押圧力を受けて上記刃物嵌着孔３の内方へ変位する当板体５で構成したことを特徴としている。 In the first invention of the present application, the fixed portion 21 of the blade 2 is inserted into the blade fitting hole 3 opened on the tip surface 1a of the shank 1 that is rotationally driven around the axis, and the fixed portion 21 is inserted into the shank 1 described above. In a cutting tool that is pressed and fixed by a fixing screw 6 provided on the outer peripheral surface 1b, a predetermined range including a portion corresponding to the fixing screw 6 in the circumferential direction on the inner wall surface of the blade fitting hole 3. Is formed of an abutting plate body 5 that is integrally formed with the shank 1 and that is displaced inward of the blade fitting hole 3 under the pressing force of the fixing screw 6.

本願の第２の発明では、上記第１の発明に係る切削工具において、上記当板体５を、上記刃物嵌着孔３の内壁面の一部を、該内壁面の周方向における一端部５ａが該内壁面に連続するように板状に切り出して構成したことを特徴としている。 In the second invention of the present application, in the cutting tool according to the first invention, the abutting plate body 5, a part of the inner wall surface of the blade fitting hole 3, and one end portion 5 a in the circumferential direction of the inner wall surface. Is cut out into a plate shape so as to be continuous with the inner wall surface.

本願の第３の発明では、上記第１又は第２の発明に係る切削工具において、上記刃物２の固定部２１が矩形の軸方向断面形状をもつ一方、上記刃物嵌着孔３が矩形の軸方向断面形状をもつものであって、上記当板体５で上記刃物嵌着孔３の内壁面の一辺を構成するとともに、その一端部５ａを該一辺の一方の隅部に連続させ、その他端部５ｂを上記一辺の他方の隅部の近傍において上記内壁面から離間した自由端としたことを特徴としている。 In the third invention of the present application, in the cutting tool according to the first or second invention, the fixed portion 21 of the blade 2 has a rectangular axial cross-sectional shape, while the blade fitting hole 3 has a rectangular shaft. The plate body 5 forms one side of the inner wall surface of the blade fitting hole 3 and has one end 5a continuous with one corner of the one side, and the other end. The portion 5b is a free end separated from the inner wall surface in the vicinity of the other corner of the one side.

本願の第４の発明では、上記第１又は第２の発明に係る切削工具において、上記刃物２の固定部２１が円形の軸方向断面形状をもつ一方、上記刃物嵌着孔３が円形の軸方向断面形状をもつものであって、上記当板体５は上記刃物嵌着孔３の内壁面に沿って延びる湾曲板状の形体をもち、その一端部５ａを上記内壁面に連続させ、その他端部５ｂを上記内壁面から径方向へ離間した自由端としたことを特徴としている。 In the fourth invention of the present application, in the cutting tool according to the first or second invention, the fixed portion 21 of the cutter 2 has a circular axial sectional shape, while the cutter fitting hole 3 has a circular shaft. The abutting plate body 5 has a curved plate-like shape extending along the inner wall surface of the blade fitting hole 3 and has one end 5a continuous with the inner wall surface. The end portion 5b is a free end spaced radially from the inner wall surface.

本願の第５の発明では、上記第４の発明に係る切削工具において、上記固定ビス６の上記当板体５への当接位置における押圧方向を垂直方向よりも上記当板体５の他端部５ｂ側へ傾斜した方向に設定したことを特徴としている。 In the fifth invention of the present application, in the cutting tool according to the fourth invention, the pressing direction at the position where the fixing screw 6 contacts the abutting plate body 5 is set to the other end of the abutting plate body 5 rather than the vertical direction. It is characterized in that it is set in a direction inclined toward the portion 5b.

本願の第６の発明では、上記第１又は第２の発明に孫る切削工具において、上記刃物２の固定部２１が円形の軸方向断面形状をもち且つその外周面に平坦な面摺部２４が設けられる一方、上記刃物嵌着孔３が円形の軸方向断面形状をもち且つその内壁面の一側には上記当板体５が設けられるとともに、該当板体５は上記刃物嵌着孔３内を弦状に延出する平板形体をもち、その一端部５ａを上記内壁面に連続させ、その他端部５ｂを上記内壁面から径方向へ離間した自由端としたことを特徴としている。 In the sixth invention of the present application, in the cutting tool subordinate to the first or second invention, the fixed portion 21 of the cutter 2 has a circular axial cross-sectional shape and is flat on the outer peripheral surface. The blade fitting hole 3 has a circular axial cross-sectional shape, and the abutting plate body 5 is provided on one side of the inner wall surface, and the corresponding plate body 5 is provided with the blade fitting hole 3. It has a flat plate shape that extends in a string shape inside, and is characterized in that one end portion 5a is continuous with the inner wall surface and the other end portion 5b is a free end spaced radially from the inner wall surface.

（ａ）本願の第１の発明に係る切削工具では、軸心回りに回転駆動されるシャンク１の先端面１ａ上に開口する刃物嵌着孔３に刃物２の固定部２１を嵌挿し、該固定部２１を上記シャンク１の外周面１ｂ上に設けられた固定ビス６によって押圧固定してなる切削工具において、上記刃物嵌着孔３の内壁面のうち、その周方向において上記固定ビス６に対応する部分を含む所定範囲を、上記シャンク１と一体的に形成され且つ上記固定ビス６の押圧力を受けて上記刃物嵌着孔３の内方へ変位する当板体５で構成しているので、上記固定ビス６を締め込むと、該固定ビス６の押し込み力を受けて上記当板体５が上記刃物嵌着孔３の内方へ変位し、その略全面が上記刃物２の固定部２１の手前側の面（即ち、上記刃物２の固定部２１が矩形の軸方向断面形状をもつ場合には手前側の平面部分であり、上記固定部２１が円形の軸方向断面形状をもつ場合には手前側の略半周面である）に衝合当接され、該固定ビス６の押圧力が上記当板体５の略全面に分散され、該当板体５の略全域から上記刃物２の固定部２１の手前側の面に伝達されるとともに、該刃物２が押し込み方向前方へ移動され、上記刃物２の固定部２１の前方側の面（即ち、上記刃物２の固定部２１が矩形の軸方向断面形状をもつ場合には前方側の平面部分であり、上記固定部２１が円形の軸方向断面形状をもつ場合には前方側の略半周面である）が上記刃物嵌着孔３の内壁面に押し付けられる。 (A) In the cutting tool according to the first invention of the present application, the fixing portion 21 of the blade 2 is inserted into the blade fitting hole 3 opened on the tip surface 1a of the shank 1 driven to rotate about the axis, In the cutting tool in which the fixing portion 21 is pressed and fixed by the fixing screw 6 provided on the outer peripheral surface 1b of the shank 1, the fixing screw 6 is connected to the fixing screw 6 in the circumferential direction on the inner wall surface of the blade fitting hole 3. The predetermined range including the corresponding portion is formed by the plate body 5 that is formed integrally with the shank 1 and that is displaced inward of the blade fitting hole 3 by receiving the pressing force of the fixing screw 6. Therefore, when the fixing screw 6 is tightened, the pressing plate 5 receives the pressing force of the fixing screw 6 to displace the abutting plate body 5 inwardly of the blade fitting hole 3, and substantially the entire surface thereof is a fixing portion of the blade 2. 21 is a front side surface (that is, the fixed portion 21 of the cutter 2 has a rectangular axial direction) If it has a surface shape, it is a flat surface portion on the near side, and if the fixing portion 21 has a circular axial cross-sectional shape, it is abutted against the front side), and the fixing screw 6 is distributed over substantially the entire surface of the abutting plate body 5 and is transmitted from substantially the entire area of the corresponding plate body 5 to the front surface of the fixing portion 21 of the blade 2, and the blade 2 is moved forward in the pushing direction. To the front side surface of the fixing part 21 of the cutter 2 (that is, when the fixing part 21 of the cutter 2 has a rectangular axial cross-sectional shape, it is a flat part on the front side, and the fixing part 21 In the case of having a circular axial sectional shape) is pressed against the inner wall surface of the blade fitting hole 3.

この結果、上記固定ビス６の押圧力によって、上記刃物２の固定部２１には、該固定部２１の手前側の面と上記当板体５との間に発生する摩擦力と、該固定部２１の前方側の面と上記刃物嵌着孔３の内壁面との間に発生する摩擦力とが作用することとなり、これら二つの摩擦力によって上記刃物嵌着孔３に対する上記刃物２の固定保持力が高められ、例え誤った操作等によって上記刃物２に側方から過大な力が掛けられたとしても、該刃物２が位置ズレするのが防止され、切削工具の精度上の信頼性の更なる向上が図られることになる。 As a result, due to the pressing force of the fixing screw 6, the fixing portion 21 of the cutter 2 has a frictional force generated between the front surface of the fixing portion 21 and the plate body 5, and the fixing portion. The frictional force generated between the front surface of 21 and the inner wall surface of the blade fitting hole 3 acts, and these two frictional forces fix and hold the blade 2 with respect to the blade fitting hole 3. Even if an excessive force is applied to the cutter 2 from the side due to an erroneous operation or the like, the cutter 2 is prevented from being displaced and the reliability of the cutting tool is improved. Improvement will be achieved.

また、上記当板体５が上記シャンク１と一体的に形成されていることから、上記固定ビス６の締め込み時に上記当板体５との間に発生する摩擦力によって該当板体５に締め込み方向への回転力が作用しても、該刃物２には上記当板体５側からの押し付け力のみが伝達され、上記回転力は上記刃物２側には伝達されない。このため、上記固定ビス６の締め込み時における上記刃物２の回転変位による位置ズレ、即ち、「初期位置ズレ」が確実に防止され、それだけ切削工具の精度上の信頼性がさらに高められることになる。 Further, since the abutting plate body 5 is formed integrally with the shank 1, it is fastened to the corresponding plate body 5 by a frictional force generated between the abutting plate body 5 when the fixing screw 6 is tightened. Even if a rotational force in the insertion direction acts, only the pressing force from the abutting plate body 5 side is transmitted to the blade 2, and the rotational force is not transmitted to the blade 2 side. For this reason, the positional deviation due to the rotational displacement of the blade 2 when the fixing screw 6 is tightened, that is, the “initial positional deviation” is surely prevented, and the reliability on the accuracy of the cutting tool is further enhanced accordingly. Become.

（ｂ）本願の第２の発明に係る切削工具によれば、上記（ａ）に記載の効果に加えて次のような特有の効果が得られる。即ち、この発明では、上記当板体５を、上記刃物嵌着孔３の内壁面の一部を、該内壁面の周方向における一端部５ａが該内壁面に連続するように板状に切り出して構成しているので、例えば、上記当板体５として上記シャンク１とは別体の部材を配置する場合に比して、構造の簡単化、部品点数の低減が図れるとともに、上記刃物２の着脱時においても上記当板体５が上記シャンク１側から離脱したり、上記刃物嵌着孔３に対して位置ズレしたりすることが無くその取り扱いが容易であることから、上記刃物２の着脱時における作業性が向上する。 (B) According to the cutting tool according to the second invention of the present application, in addition to the effect described in the above (a), the following specific effect is obtained. In other words, in the present invention, the abutting plate body 5 is cut into a plate shape so that a part of the inner wall surface of the blade fitting hole 3 is continuous with one end portion 5a in the circumferential direction of the inner wall surface. For example, as compared with the case where a member separate from the shank 1 is arranged as the abutting plate body 5, the structure can be simplified and the number of parts can be reduced. Since the abutment plate 5 is not detached from the shank 1 side and is not displaced with respect to the blade fitting hole 3 even during attachment / detachment, the blade 2 can be easily attached and detached. Workability at the time is improved.

（ｃ）本願の第３の発明に係る切削工具によれば、上記（ａ）又は（ｂ）に記載の効果に加えて次のような特有の効果が得られる。即ち、この発明では、上記刃物２の固定部２１が矩形の軸方向断面形状をもつ一方、上記刃物嵌着孔３が矩形の軸方向断面形状をもつものであって、上記当板体５で上記刃物嵌着孔３の内壁面の一辺を構成するとともに、その一端部５ａを該一辺の一方の隅部に連続させ、その他端部５ｂを上記一辺の他方の隅部の近傍において上記内壁面から離間した自由端としているので、上記当板体５の上記一端部５ａ側からの撓曲変形によって該当板体５の上記刃物２の固定部２１に対する衝合当接状態が良好となり、これらの間に大きな摩擦力が発生し、その結果、矩形の軸方向断面形状をもつ刃物２の固定保持が確実ならしめられる。 (C) According to the cutting tool according to the third invention of the present application, in addition to the effect described in the above (a) or (b), the following specific effect is obtained. That is, according to the present invention, the fixed portion 21 of the blade 2 has a rectangular axial cross section, while the blade fitting hole 3 has a rectangular axial cross section. While constituting one side of the inner wall surface of the blade fitting hole 3, the one end portion 5a is continued to one corner portion of the one side, and the other end portion 5b is disposed in the vicinity of the other corner portion of the one side. Since the free end is separated from the one end portion 5a side of the plate body 5, the abutting contact state of the plate body 5 with respect to the fixed portion 21 of the blade 2 becomes good. A large frictional force is generated between them, and as a result, the blade 2 having a rectangular axial cross-sectional shape is securely held.

（ｄ）本願の第４の発明に係る切削工具によれば、上記（ａ）又は（ｂ）に記載の効果に加えて次のような特有の効果が得られる。即ち、この発明では、上記刃物２の固定部２１が円形の軸方向断面形状をもつ一方、上記刃物嵌着孔３が円形の軸方向断面形状をもつものであって、上記当板体５は上記刃物嵌着孔３の内壁面に沿って延びる湾曲板状の形体をもち、その一端部５ａを上記内壁面に連続させ、その他端部５ｂを上記内壁面から径方向へ離間した自由端としているので、上記当板体５の上記一端部５ａ側からの撓曲変形によって該当板体５の上記刃物２の固定部２１に対する衝合当接状態が良好となり、これらの間に大きな摩擦力が発生し、その結果、円形の軸方向断面形状をもつ刃物２の固定保持が確実ならしめられる。 (D) According to the cutting tool according to the fourth invention of the present application, in addition to the effect described in the above (a) or (b), the following specific effect is obtained. That is, in the present invention, the fixed portion 21 of the blade 2 has a circular axial cross-sectional shape, while the blade fitting hole 3 has a circular axial cross-sectional shape. It has a curved plate-like shape extending along the inner wall surface of the blade fitting hole 3, its one end 5 a is continuous with the inner wall surface, and the other end 5 b as a free end spaced radially from the inner wall surface. Therefore, the abutting contact state of the corresponding plate body 5 with respect to the fixed portion 21 of the blade 2 is improved by bending deformation from the one end portion 5a side of the plate body 5, and a large frictional force is generated between them. As a result, the fixed holding of the blade 2 having a circular axial cross-sectional shape is ensured.

（ｅ）本願の第５の発明に係る切削工具によれば、上記（ｄ）に記載の効果に加えて次のような特有の効果が得られる。即ち、この発明では、上記固定ビス６の上記当板体５への当接位置における押圧方向を垂直方向よりも上記当板体５の他端部５ｂ側へ傾斜した方向に設定しているので、上記固定ビス６により上記当板体５に押圧力が掛けられた場合、上記当板体５は上記他端部５ｂ側へ引き寄せられ、絞りによる縮径作用を受けながら上記シャンク１の外周面に押し付けられることになり、その結果、上記当板体５の上記刃物２の固定部２１に対する衝合当接状態が良好となり、上記刃物２の上記シャンク１に対する固定保持性能がさらに向上し、延いては、切削工具としての使用上の信頼性がさらに向上することになる。 (E) According to the cutting tool according to the fifth invention of the present application, in addition to the effect described in the above (d), the following specific effect can be obtained. That is, in the present invention, the pressing direction at the position where the fixed screw 6 is in contact with the abutting plate body 5 is set to a direction inclined to the other end portion 5b side of the abutting plate body 5 from the vertical direction. When a pressing force is applied to the abutting plate body 5 by the fixing screw 6, the abutting plate body 5 is drawn toward the other end portion 5b, and the outer peripheral surface of the shank 1 is subjected to a diameter reducing action by a restriction. As a result, the abutting contact state of the blade body 5 with the fixed portion 21 of the blade 2 is improved, and the fixing and holding performance of the blade 2 with respect to the shank 1 is further improved. In this case, the reliability in use as a cutting tool is further improved.

（ｆ）本願の第６の発明に係る切削工具によれば、上記（ａ）又は（ｂ）に記載の効果に加えて次のような特有の効果が得られる。即ち、この発明では、上記刃物２の固定部２１が円形の軸方向断面形状をもち且つその外周面に平坦な面摺部２４が設けられる一方、上記刃物嵌着孔３が円形の軸方向断面形状をもち且つその内壁面の一側には上記当板体５が設けられるとともに、該当板体５は上記刃物嵌着孔３内を弦状に延出する平板形体をもち、その一端部５ａを上記内壁面に連続させ、その他端部５ｂを上記内壁面から径方向へ離間した自由端としているので、上記刃物２の固定部２１側の上記面摺部２４と上記シャンク１側の上記当板体５が上記刃物２とシャンク１の相対回転方向において係合することでその相対回転が規制されるとともに、上記当板体５の上記一端部５ａ側からの撓曲変形によって該当板体５の略全面が上記刃物２の上記面摺部２４に衝合当接してこれらの間に大きな摩擦力が発生しその相対変位が規制され、これら両者の相乗作用によって、円形の軸方向断面形状をもつ刃物２の固定保持がより一層確実ならしめられる。 (F) According to the cutting tool of the sixth invention of the present application, in addition to the effects described in the above (a) or (b), the following specific effects can be obtained. That is, in the present invention, the fixed portion 21 of the cutter 2 has a circular axial cross-sectional shape and a flat surface slide portion 24 is provided on the outer peripheral surface thereof, while the cutter fitting hole 3 has a circular axial cross-section. The abutting plate body 5 is provided on one side of the inner wall surface, and the corresponding plate body 5 has a flat plate shape extending in a chordal shape in the blade fitting hole 3, and has one end 5a. Is connected to the inner wall surface, and the other end 5b is a free end radially spaced from the inner wall surface, so that the surface sliding portion 24 on the fixed portion 21 side of the cutter 2 and the contact on the shank 1 side are When the plate body 5 is engaged in the relative rotation direction of the blade 2 and the shank 1, the relative rotation is restricted, and the plate body 5 is bent by the bending deformation from the one end portion 5a side. Of the blade 2 abuts against the surface slide portion 24 of the cutter 2. Is a large frictional force is generated between them the relative displacement restricting, by the synergistic action of these two, the fixed holding tool 2 having a circular axial cross section is crimped if more reliably.

以下、本願発明を好適な実施形態に基づいて具体的に説明する。 Hereinafter, the present invention will be specifically described based on preferred embodiments.

「Ａ：第１の実施形態」
図１〜図４には、本願発明の第１の実施形態に係る切削工具Ｚ１を示している。この切削工具Ｚ１は、ワークとしての木材に深溝加工を行なうための工具であって、次述のシャンク１と刃物２を備えて構成され、上記刃物２をワークの表面に対して略垂直に立てた状態で、これを側方（即ち、刃物２の軸方向に直交する方向）へ所定速度で移動させることで溝加工を行うものである。“A: First Embodiment”
1 to 4 show a cutting tool Z1 according to a first embodiment of the present invention. The cutting tool Z1 is a tool for performing deep grooving on wood as a workpiece, and includes a shank 1 and a blade 2 described below, and the blade 2 is set up substantially perpendicular to the surface of the workpiece. In this state, grooving is performed by moving this sideward (that is, in a direction orthogonal to the axial direction of the blade 2) at a predetermined speed.

上記シャンク１は、次述の刃物２を取り付けた状態で、所定の加工機械の加工ヘッドに装着されるものであって、軟鋼等の一般鋼材からなる丸棒体を素材として形成され、その軸心部には次述の刃物嵌着孔３と丸穴８が同軸状に設けられている。 The shank 1 is attached to a processing head of a predetermined processing machine with the following blade 2 attached, and is formed from a round bar made of a general steel material such as mild steel, and its shaft The center portion is provided with the following blade fitting hole 3 and round hole 8 coaxially.

上記刃物嵌着孔３は、上記シャンク１の頂面１ａ上の軸心位置に開口し、且つ軸心に沿って軸方向に延びるとともに、その下端は次述の丸穴８の上端に開口している。この刃物嵌着孔３は、次述の付勢体４及び当板体５と共に、ホットワイヤー加工によって形成されている。 The blade fitting hole 3 opens at the axial center position on the top surface 1a of the shank 1 and extends in the axial direction along the axial center, and the lower end thereof opens at the upper end of the round hole 8 described below. ing. The blade fitting hole 3 is formed by hot wire processing together with the energizing body 4 and the plate body 5 described below.

即ち、上記刃物嵌着孔３は、図１及び図３に示すように、矩形の断面形状をもつものであって、対向する一対の長辺側内壁面３ａ、３ｂと、対向する一対の短辺側内壁面３ｃ、３ｄを備えている。そして、これら一対の長辺側内壁面３ａ、３ｂと一対の短辺側内壁面３ｃ、３ｄのうち、一方の長辺側内壁面３ａと一方の短辺側内壁面３ｃは上記シャンク１に直接形成された平面である。 That is, as shown in FIGS. 1 and 3, the blade fitting hole 3 has a rectangular cross-sectional shape, and has a pair of opposed long side inner wall surfaces 3 a and 3 b and a pair of opposed short surfaces. Side side inner wall surfaces 3c and 3d are provided. Of the pair of long side inner wall surfaces 3a and 3b and the pair of short side inner wall surfaces 3c and 3d, one long side inner wall surface 3a and one short side inner wall surface 3c are directly attached to the shank 1. It is a formed plane.

これに対して、他方の長辺側内壁面３ｂは、上記シャンク１を上記一方の短辺側内壁面３ｃ側から薄板状に切り出して形成された平板状の当板体５の表面で構成されている。そして、この当板体５は、その一端部５ａが上記一方の短辺側内壁面３ｃ側に連続する一方、他端部５ｂは上記他方の短辺側内壁面３ｄと非連続の自由端とされ、しかもその背面側にはスリット状の逃げ部１２が形成されている。このため、上記当板体５は、上記一端部５ａ側を支点に、上記刃物嵌着孔３の内外方向へ撓曲変形自在とされる。 On the other hand, the other long side inner wall surface 3b is constituted by the surface of a flat plate body 5 formed by cutting the shank 1 into a thin plate shape from the one short side inner wall surface 3c. ing. The plate body 5 has one end portion 5a continuous to the one short side inner wall surface 3c side, while the other end portion 5b has a discontinuous free end and the other short side inner wall surface 3d. In addition, a slit-shaped escape portion 12 is formed on the back side thereof. For this reason, the abutting plate body 5 can be flexibly deformed inward and outward of the blade fitting hole 3 with the one end portion 5a side as a fulcrum.

また、上記当板体５の背面側には、上記逃げ部１２に連続する逃げ部１０が形成されている。そして、この逃げ部１０には、上記シャンク１の外周面１ｂ側からその軸方向に沿って所定間隔で穿設された三個のビス孔７が臨んでいるとともに、該各ビス孔７にはそれぞれ固定ビス６が螺合される。 Further, an escape portion 10 that is continuous with the escape portion 12 is formed on the back side of the plate body 5. The escape portion 10 has three screw holes 7 drilled at a predetermined interval along the axial direction from the outer peripheral surface 1b side of the shank 1. Each fixing screw 6 is screwed.

一方、上記刃物嵌着孔３の他方の短辺側内壁面３ｄ側には、該内壁面３ｄの一部を上記一方の長辺側内壁面３ａ側から切り出して、付勢体４が設けられている。この付勢体４は、略楕円断面形状をもつ当接部４ａと、該当接部４ａの一端に連続する薄板状形態で且つ上記一方の長辺側内壁面３ａ側に連続する撓曲部４ｂを備えた構成とされる。また、上記付勢体４の背面側にはスリット状の逃げ部１１が設けられており、該逃げ部１１の存在によって上記付勢体４は、該逃げ部１１の範囲内において上記刃物嵌着孔３の外方側へ撓曲変形可能とされる。 On the other hand, on the other short side inner wall surface 3d side of the cutter fitting hole 3, a part of the inner wall surface 3d is cut out from the one long side inner wall surface 3a side, and an urging body 4 is provided. ing. The urging body 4 includes a contact portion 4a having a substantially elliptical cross-sectional shape, and a thin plate shape continuous to one end of the corresponding contact portion 4a and a bent portion 4b continuous to the one long side inner wall surface 3a side. It is set as the structure provided with. Further, a slit-shaped escape portion 11 is provided on the back side of the biasing body 4, and the biasing body 4 is fitted into the cutter within the range of the escape portion 11 due to the presence of the relief portion 11. The outer side of the hole 3 can be bent and deformed.

上記刃物２は、例えば、超硬合金、サーメット、セラミック等の超硬質材で一体形成されるものであって、図１に示すように、矩形の断面形状をもつ角棒状の固定部２１と、該固定部２１の上端に連続して形成され且つ１８０°の回転位相をもって一対の切刃２３を設けた刃部２２とを備えて構成される。尚、上記固定部２１の断面形状は、上記シャンク１側の上記刃物嵌着孔３の断面形状に対応するように設定されている。 The blade 2 is integrally formed of a super hard material such as cemented carbide, cermet, ceramic, etc., and as shown in FIG. 1, a rectangular bar-shaped fixing portion 21 having a rectangular cross section, The blade portion 22 is formed continuously with the upper end of the fixed portion 21 and has a pair of cutting blades 23 with a rotation phase of 180 °. The cross-sectional shape of the fixed portion 21 is set so as to correspond to the cross-sectional shape of the blade fitting hole 3 on the shank 1 side.

以上のように構成された上記シャンク１の上記刃物嵌着孔３に、上記刃物２の上記固定部２１を嵌挿し且つこれを上記各固定ビス６によって固定保持することで、図２に示すように、上記切削工具Ｚ１が得られる。 As shown in FIG. 2, the fixing portion 21 of the blade 2 is inserted into the blade insertion hole 3 of the shank 1 configured as described above and is fixedly held by the fixing screws 6. In addition, the cutting tool Z1 is obtained.

この場合、図４に示すように、上記刃物２の上記固定部２１は、上記シャンク１の上記刃物嵌着孔３内において、上記固定ビス６に対して手前側に位置する一方の長辺面２１ａが上記当板体５に、前方側に位置する他方の長辺面２１ｂが上記刃物嵌着孔３の長辺側内壁面３ａに、右側に位置する一方の短辺面２１ｃが上記刃物嵌着孔３の短辺側内壁面３ｂに、さらに左側に位置する他方の短辺面２１ｄが上記付勢体４の当接部４ａに、それぞれ衝合当接している。 In this case, as shown in FIG. 4, the fixing portion 21 of the cutter 2 is one long side surface located on the front side with respect to the fixing screw 6 in the cutter fitting hole 3 of the shank 1. 21 a is on the abutting plate body 5, the other long side surface 21 b located on the front side is on the inner wall surface 3 a on the long side of the blade fitting hole 3, and one short side surface 21 c located on the right side is on the blade fitting. The other short side surface 21d located on the left side is in abutting contact with the contact portion 4a of the urging body 4 on the inner side wall surface 3b on the short side of the hole 3 respectively.

そして、上記刃物２は、上記固定ビス６の締め込み前において、上記付勢体４の弾性復元力によって上記刃物嵌着孔３の上記一方の短辺側内壁面３ｂ側に押圧されることでその長辺方向の位置決めがなされるとともに、さらに上記固定ビス６が締め込まれることで上記当板体５の撓曲変形と同時に上記刃物嵌着孔３の上記一方の長辺側内壁面３ａ側に押圧されることでその短辺方向の位置決めがなされ、これら両作用によって、上記シャンク１の上記刃物嵌着孔３に対して上記刃物２が適正位置（即ち、上記シャンク１の軸心と上記刃物２の軸心が合致する位置）へ的確に位置決めされることになる。 The cutter 2 is pressed toward the one short side inner wall surface 3b of the cutter fitting hole 3 by the elastic restoring force of the biasing body 4 before the fixing screw 6 is tightened. Positioning in the long side direction is performed, and further, the fixing screw 6 is further tightened, so that the one long side side inner wall surface 3a side of the blade fitting hole 3 is simultaneously bent and deformed. Is pressed in the direction of the short side, and by both of these actions, the blade 2 is positioned in an appropriate position with respect to the blade fitting hole 3 of the shank 1 (that is, the axis of the shank 1 and the shaft Thus, the blade 2 is accurately positioned at a position where the axis of the blade 2 matches.

また、このように上記固定ビス６を締め込んだ場合、該固定ビス６の押し込み力を受けて上記当板体５が上記刃物嵌着孔３の内方へ変位し、その略全面が上記刃物２の固定部２１の手前側の面２１ａに衝合当接される。そして、上記固定ビス６の押圧力が上記当板体５の略全面に分散され、該当板体５の略全域から上記刃物２の固定部２１の手前側の面２１ａに伝達されるとともに、該刃物２が押し込み方向前方へ移動され、上記刃物２の固定部２１の前方側の面２１ｂが上記刃物嵌着孔３の上記一方の長辺側内壁面３ａに押し付けられる。 Further, when the fixing screw 6 is tightened in this way, the abutting plate body 5 is displaced inward of the blade fitting hole 3 by receiving the pushing force of the fixing screw 6, and the substantially entire surface thereof is the blade. 2 abuts against the front surface 21a of the fixed portion 21. The pressing force of the fixing screw 6 is distributed over substantially the entire surface of the abutting plate body 5 and is transmitted from substantially the entire area of the corresponding plate body 5 to the front surface 21a of the fixing portion 21 of the cutter 2, The blade 2 is moved forward in the pushing direction, and the front surface 21 b of the fixing portion 21 of the blade 2 is pressed against the one long side inner wall surface 3 a of the blade fitting hole 3.

この結果、上記固定ビス６の押圧力によって、上記刃物２の固定部２１には、該固定部２１の手前側の面２１ａと上記当板体５との間に発生する摩擦力と、該固定部２１の前方側の面２１ｂと上記刃物嵌着孔３の上記一方の長辺側内壁面３ａとの間に発生する摩擦力とが作用することとなり、これら二つの摩擦力によって上記刃物嵌着孔３に対する上記刃物２の固定保持力が高められ、例え誤った操作等によって上記刃物２に側方から過大な力が掛けられたとしても、該刃物２が位置ズレするのが防止され、切削工具の精度上の信頼性の更なる向上が図られることになる。 As a result, due to the pressing force of the fixing screw 6, the fixing portion 21 of the cutter 2 has a frictional force generated between the front surface 21 a of the fixing portion 21 and the abutting plate body 5, and the fixing portion 21. The frictional force generated between the front surface 21b of the portion 21 and the one long side inner wall surface 3a of the blade fitting hole 3 acts, and the blade fitting is performed by these two frictional forces. The fixing and holding force of the blade 2 with respect to the hole 3 is increased, and even if an excessive force is applied to the blade 2 from the side by an erroneous operation or the like, the blade 2 is prevented from being displaced, and cutting is performed. The reliability of the accuracy of the tool is further improved.

また、上記当板体５が上記シャンク１に設けられた上記刃物嵌着孔３の内壁面の一部から切り出されたもので上記シャンク１と一体化されていることから、上記固定ビス６の締め込み時に上記当板体５との間に発生する摩擦力によって側当板体５に締め込み方向への回転力が作用しても、該刃物２には上記当板体５側からの押し付け力のみが伝達され、上記回転力は上記刃物２側には伝達されない。このため、上記固定ビス６の締め込み時における上記刃物２の回転変位による位置ズレ、即ち、「初期位置ズレ」が確実に防止され、それだけ切削工具Ｚ１の精度上の信頼性がさらに高められることになる。 Further, since the abutment plate 5 is cut out from a part of the inner wall surface of the blade fitting hole 3 provided in the shank 1 and integrated with the shank 1, the fixing screw 6 Even if a rotational force in the tightening direction acts on the side abutting plate 5 due to a frictional force generated between the abutting plate 5 at the time of tightening, the blade 2 is pressed from the abutting plate 5 side. Only the force is transmitted, and the rotational force is not transmitted to the blade 2 side. For this reason, the positional deviation due to the rotational displacement of the blade 2 when the fixing screw 6 is tightened, that is, the “initial positional deviation” is surely prevented, and the reliability in accuracy of the cutting tool Z1 is further enhanced accordingly. become.

さらに、上述のように、上記当板体５が上記刃物嵌着孔３の内壁面の一部から切り出されたものであって上記シャンク１と一体化されていることから、例えば、上記当板体５として上記シャンク１とは別体の部材を配置する場合に比して、構造の簡単化、部品点数の低減が図れるとともに、上記刃物２の着脱時においても上記当板体５が上記シャンク１側から離脱したり、上記刃物嵌着孔３に対して位置ズレしたりすることが無くその取り扱いが容易であることから、上記刃物２の着脱時における作業性が向上することになる。 Further, as described above, since the abutting plate body 5 is cut out from a part of the inner wall surface of the blade fitting hole 3 and integrated with the shank 1, for example, the abutting plate Compared with the case where a member separate from the shank 1 is disposed as the body 5, the structure can be simplified and the number of parts can be reduced, and the plate body 5 can be used when the blade 2 is attached or detached. Since it is easy to handle without being disengaged from the 1 side or displaced with respect to the blade fitting hole 3, workability at the time of attaching and detaching the blade 2 is improved.

「Ｂ：第２の実施形態」
図５〜図８には、本願発明の第２の実施形態に係る切削工具Ｚ２を示している。この切削工具Ｚ２は、上記第１の実施形態に係る切削工具Ｚ１の場合と同様に、ワークとしての木材に深溝加工を行なうための工具であって、シャンク１と刃物２を備えて構成される。そして、上記第１の実施形態に係る切削工具Ｚ１においては上記刃物２の上記固定部２１が矩形断面形状とされていたのに対して、この第２の実施形に係る切削工具Ｚ２は、上記各図に示されるように、該刃物２の固定部２１が円形断面形状とされている点である。“B: Second Embodiment”
5 to 8 show a cutting tool Z2 according to a second embodiment of the present invention. This cutting tool Z2 is a tool for performing deep grooving processing on wood as a workpiece, as in the case of the cutting tool Z1 according to the first embodiment, and includes a shank 1 and a blade 2. . And in the cutting tool Z1 which concerns on the said 1st Embodiment, while the said fixing | fixed part 21 of the said cutter 2 was made into the rectangular cross-sectional shape, the cutting tool Z2 which concerns on this 2nd embodiment is the above-mentioned As shown in each drawing, the fixing portion 21 of the blade 2 is a circular cross-sectional shape.

従って、ここでは、上記刃物２の固定部２１が円形断面形状であることに起因する特有の構成、即ち、該刃物２の固定部２１が嵌挿される上記シャンク１側の上記刃物嵌着孔３の構造を中心に説明し、上記第１の実施形態の切削工具Ｚ１と同一の構成部分については上記第１の実施形態における該当説明を援用することで、その説明を省略する。 Accordingly, here, a specific configuration resulting from the fixed portion 21 of the blade 2 having a circular cross-sectional shape, that is, the blade fitting hole 3 on the shank 1 side into which the fixed portion 21 of the blade 2 is inserted. The description of the structure will be omitted, and the description of the same components as those of the cutting tool Z1 of the first embodiment will be omitted by using the corresponding description in the first embodiment.

上記刃物嵌着孔３は、上記シャンク１の頂面１ａ上の軸心位置に開口し、且つ軸心に沿って軸方向に延びるとともに、その下端は次述の丸穴８の上端に開口している。この刃物嵌着孔３は、次述の当板体５がホットワイヤー加工によって形成されている。 The blade fitting hole 3 opens at the axial center position on the top surface 1a of the shank 1 and extends in the axial direction along the axial center, and the lower end thereof opens at the upper end of the round hole 8 described below. ing. In the blade fitting hole 3, the abutting plate body 5 described below is formed by hot wire processing.

上記刃物嵌着孔３は、図５及び図７に示すように、円形の断面形状をもつものであって、上記シャンク１と同心状に形成され、その内径寸法は上記刃物２の固定部２１の外径寸法よりも僅かに大径とされている。そして、この刃物嵌着孔３は、その内壁面の周長の略半分の部分が、次述する当板体５によって形状されている。 As shown in FIGS. 5 and 7, the blade fitting hole 3 has a circular cross-sectional shape, is formed concentrically with the shank 1, and has an inner diameter dimension of the fixed portion 21 of the blade 2. The outer diameter is slightly larger than the outer diameter. The blade fitting hole 3 has a half of the circumference of the inner wall surface thereof formed by the abutting plate body 5 described below.

即ち、上記当板体５は、上記刃物嵌着孔３の内壁面の略半分の部分を、ホットワイヤー加工によって、該内壁面に沿って薄い湾曲板状に切り出して形成されたものであって、その周方向の一端部５ａは上記内壁面側に連続する一方、周方向の他端部５ｂは上記内壁面と非連続の自由端とされ、しかもその背面側にはスリット状の逃げ部１３が形成されている。従って、この当板体５は、上記一端部５ａ側を支点に、上記刃物嵌着孔３の径方向へ撓曲変形自在とされている。 That is, the abutting plate body 5 is formed by cutting a substantially half portion of the inner wall surface of the blade fitting hole 3 into a thin curved plate shape along the inner wall surface by hot wire processing. One end portion 5a in the circumferential direction is continuous with the inner wall surface side, while the other end portion 5b in the circumferential direction is a free end discontinuous with the inner wall surface, and a slit-like relief portion 13 is formed on the back side. Is formed. Therefore, the abutting plate body 5 can be flexibly deformed in the radial direction of the blade fitting hole 3 with the one end portion 5a side as a fulcrum.

尚、以下、説明の便宜上、上記刃物嵌着孔３の内壁面のうち、上記シャンク１側に直接形成された部分を第１壁面３ａ、上記当板体５の表面で構成される部分を第２壁面３ｂという。 Hereinafter, for convenience of explanation, the portion formed directly on the shank 1 side of the inner wall surface of the blade fitting hole 3 is defined as the first wall surface 3a, and the portion constituted by the surface of the plate body 5 is defined as the first wall surface. It is called 2 wall surface 3b.

また、上記当板体５の背面側で且つ上記他端部５ｂ部分に対応する部位には、上記逃げ部１３に連続する逃げ部１０が形成されている。そして、この逃げ部１０には、上記シャンク１の外周面１ｂ側からその軸方向に沿って所定間隔で穿設された三個のビス孔７が臨んでいるとともに、該各ビス孔７にはそれぞれ固定ビス６が螺合される。 In addition, a relief portion 10 that is continuous with the relief portion 13 is formed on the rear side of the plate body 5 and corresponding to the other end portion 5b. The escape portion 10 has three screw holes 7 drilled at a predetermined interval along the axial direction from the outer peripheral surface 1b side of the shank 1. Each fixing screw 6 is screwed.

また、上記ビス孔７の形成方向、即ち、ビス孔７に螺合される上記固定ビス６の上記当板体５に対する押圧方向であるが、この実施形態では図７において符号６で示すように、上記当板体５のビス当接位置に対して略鉛直な方向とするか、又は同図において符号６′で示すように、上記当板体５のビス当接位置に対して鉛直方向よりも角度αだけ上記他端部５ｂ側へ傾斜した方向に設定するようにしている。 Further, the direction in which the screw hole 7 is formed, that is, the pressing direction of the fixed screw 6 screwed into the screw hole 7 against the abutting plate body 5, in this embodiment, as indicated by reference numeral 6 in FIG. In this case, the direction is substantially perpendicular to the screw contact position of the plate body 5 or, as indicated by reference numeral 6 'in FIG. Also, the angle α is set in a direction inclined toward the other end 5b.

以上のように構成された上記シャンク１の上記刃物嵌着孔３に、上記刃物２の上記固定部２１を嵌挿し且つこれを上記各固定ビス６によって固定保持することで、図６に示すように、上記切削工具Ｚ２が得られる。 As shown in FIG. 6, the fixing portion 21 of the blade 2 is inserted into the blade fitting hole 3 of the shank 1 configured as described above, and is fixedly held by the fixing screws 6. In addition, the cutting tool Z2 is obtained.

この場合、図８に示すように、上記固定ビス６の締め込みによって上記当板体５が上記一端部５ａ部分から上記刃物嵌着孔３の内方側へ撓曲変形してその表面（即ち、上記第１壁面３ａ）が上記刃物２の固定部２１の外周面に当接し、さらにこれを上記第２壁面３ｂ側へ押圧付勢した状態においては、上記刃物２の固定部２１は、上記刃物嵌着孔３の上記第１壁面３ａと上記当板体５側の上記第２壁面３ｂとによってその周方向の大部分が挟圧支持されることになる（尚、図８は、説明の便宜上、上記刃物嵌着孔３の内壁面と上記刃物２の固定部２１の外周面との間の隙間を誇張図示している）。 In this case, as shown in FIG. 8, when the fixing screw 6 is tightened, the abutting plate body 5 is bent and deformed from the one end portion 5a portion to the inner side of the blade fitting hole 3, and its surface (ie, In the state where the first wall surface 3a) is in contact with the outer peripheral surface of the fixed portion 21 of the blade 2 and is further pressed and urged toward the second wall surface 3b, the fixed portion 21 of the blade 2 is Most of the circumferential direction of the blade fitting hole 3 is supported by the first wall surface 3a of the blade fitting hole 3 and the second wall surface 3b of the plate body 5 (see FIG. 8). For the sake of convenience, the gap between the inner wall surface of the blade fitting hole 3 and the outer peripheral surface of the fixed portion 21 of the blade 2 is exaggerated.

この結果、上記刃物２は、その固定部２１の略全周が上記刃物嵌着孔３の内壁面に挟圧され、これらとの間に大きな摩擦力が発生し、この摩擦力によって上記シャンク１側への高い固定保持力が確保され、上記刃物２の上記シャンク１に対する位置ズレ、即ち、切削工具Ｚ２を使用しての切削加工時における上記刃物２の上記シャンク１に対する相対回転とか、誤った操作等によって上記刃物２に側方から過大な力が掛けられた場合における上記刃物２の上記刃物嵌着孔３の径方向へのズレが確実に防止され、延いては上記切削工具Ｚ２の精度上の信頼性の更なる向上が図られることになる。 As a result, the cutting tool 2 is clamped by the inner wall surface of the blade fitting hole 3 over substantially the entire circumference of the fixing portion 21, and a large frictional force is generated between them. A high fixed holding force to the side is ensured, and the positional deviation of the blade 2 with respect to the shank 1, that is, the relative rotation of the blade 2 with respect to the shank 1 during cutting using the cutting tool Z2 is incorrect. When an excessive force is applied to the cutter 2 from the side by an operation or the like, the cutter 2 is reliably prevented from being displaced in the radial direction of the cutter fitting hole 3, and the accuracy of the cutting tool Z2 is extended. The above reliability will be further improved.

また、特に、上記固定ビス６の上記当板体５への当接位置における押圧方向を、図８に符号６′で示したように、垂直方向よりも該当板体５の他端部５ｂ側へ角度αだけ傾斜した方向に設定した場合には、上記固定ビス６により上記当板体５に押圧力が掛けられた場合、上記当板体５は上記他端部５ｂ側へ引き寄せられ、絞りによる縮径作用を受けながら上記シャンク１の外周面に押し付けられることになり、その結果、上記当板体５の上記刃物２の固定部２１に対する衝合当接状態が良好となり、上記刃物２の上記シャンク１に対する固定保持性能がさらに向上し、切削工具としての使用上の信頼性が高められることになる。 Further, in particular, the pressing direction of the fixing screw 6 at the contact position with the abutting plate body 5 is the side of the other end portion 5b of the corresponding plate body 5 with respect to the vertical direction as indicated by reference numeral 6 'in FIG. In the case where the direction inclined by an angle α is set, when the pressing force is applied to the abutting plate body 5 by the fixing screw 6, the abutting plate body 5 is drawn toward the other end portion 5b side, As a result, the abutting contact state of the abutting plate 5 with the fixed portion 21 of the blade 2 is improved, and the blade 2 is pressed against the outer peripheral surface of the shank 1. The fixed holding performance with respect to the shank 1 is further improved, and the reliability in use as a cutting tool is enhanced.

さらに、上記当板体５が上記シャンク１に設けられた上記刃物嵌着孔３の内壁面の一部から切り出されたもので上記シャンク１と一体化されていることから、上記固定ビス６の締め込み時に上記当板体５との間に発生する摩擦力によって該当板体５に締め込み方向への回転力が作用しても、該刃物２には上記当板体５側からの押し付け力のみが伝達され、上記回転力は上記刃物２側には伝達されない。このため、上記固定ビス６の締め込み時における上記刃物２の回転変位による位置ズレ、即ち、「初期位置ズレ」が確実に防止され、それだけ切削工具Ｚ２の精度上の信頼性がさらに高められることになる。 Further, since the abutting plate body 5 is cut out from a part of the inner wall surface of the blade fitting hole 3 provided in the shank 1 and integrated with the shank 1, the fixing screw 6 Even if a rotational force in the tightening direction acts on the corresponding plate body 5 due to a frictional force generated between the plate body 5 at the time of tightening, the pressing force from the side of the plate body 5 is applied to the blade 2. Only the torque is transmitted, and the rotational force is not transmitted to the blade 2 side. For this reason, the positional deviation due to the rotational displacement of the blade 2 when the fixing screw 6 is tightened, that is, the “initial positional deviation” is surely prevented, and the reliability on the accuracy of the cutting tool Z2 is further enhanced accordingly. become.

また、上述のように、上記当板体５が上記刃物嵌着孔３の内壁面の一部から切り出されたものであって上記シャンク１と一体化されていることから、例えば、上記当板体５として上記シャンク１とは別体の部材を配置する場合に比して、構造の簡単化、部品点数の低減が図れるとともに、上記刃物２の着脱時においても上記当板体５が上記シャンク１側から離脱したり、上記刃物嵌着孔３に対して位置ズレしたりすることが無くその取り扱いが容易であることから、上記刃物２の着脱時における作業性が向上することになる。 Further, as described above, since the abutment plate body 5 is cut out from a part of the inner wall surface of the blade fitting hole 3 and integrated with the shank 1, for example, the abutment plate Compared with the case where a member separate from the shank 1 is disposed as the body 5, the structure can be simplified and the number of parts can be reduced, and the plate body 5 can be used when the blade 2 is attached or detached. Since it is easy to handle without being disengaged from the 1 side or displaced with respect to the blade fitting hole 3, workability at the time of attaching and detaching the blade 2 is improved.

「Ｃ：第３の実施形態」
図９〜図１２には、本願発明の第３の実施形態に係る切削工具Ｚ３を示している。この切削工具Ｚ３は、上記第１の実施形態に係る切削工具Ｚ１と上記第２の実施形態に係る切削工具Ｚ２の場合と同様に、ワークとしての木材に深溝加工を行なうための工具であって、シャンク１と刃物２を備えて構成される。“C: Third Embodiment”
9 to 12 show a cutting tool Z3 according to a third embodiment of the present invention. This cutting tool Z3 is a tool for performing deep grooving on wood as a workpiece, similarly to the cutting tool Z1 according to the first embodiment and the cutting tool Z2 according to the second embodiment. The shank 1 and the blade 2 are provided.

そして、上記第１の実施形態に係る切削工具Ｚ１においては上記刃物２の上記固定部２１が矩形断面形状とされるとともに、該固定部２１に対応する上記刃物嵌着孔３が矩形断面形状で且つ平板状の当板体５を備え、また上記第２の実施形態に係る切削工具Ｚ２においては上記刃物２の上記固定部２１が円形断面形状とされるとともに、該固定部２１に対応する上記刃物嵌着孔３が円形断面形状で且つ湾曲板状の当板体５を備えていたのに対して、この第３の実施形に係る切削工具Ｚ３は、上記各図に示されるように、上記刃物２の上記固定部２１が円形断面形状で且つその外周面の一側には平坦な面摺部２４を備えるとともに、該固定部２１に対応する上記刃物嵌着孔３が円形断面形状で且つ側刃物嵌着孔３内において弦状に延出する平板状の当板体５を備えたものであり、上記切削工具Ｚ１と上記切削工具Ｚ２を組み合わせた構成をもつものといえる。 And in the cutting tool Z1 which concerns on the said 1st Embodiment, while the said fixing | fixed part 21 of the said cutter 2 is made into a rectangular cross-sectional shape, the said blade fitting hole 3 corresponding to this fixed part 21 is a rectangular cross-sectional shape. In addition, the flat plate body 5 is provided, and in the cutting tool Z2 according to the second embodiment, the fixing portion 21 of the cutter 2 has a circular cross-sectional shape, and the fixing portion 21 corresponds to the fixing portion 21 described above. The cutting tool fitting hole 3 has a circular cross-sectional shape and has a curved plate-like abutting plate body 5, whereas the cutting tool Z3 according to the third embodiment is as shown in the above drawings. The fixed portion 21 of the cutter 2 has a circular cross-sectional shape and includes a flat surface slide portion 24 on one side of the outer peripheral surface thereof, and the cutter fitting hole 3 corresponding to the fixed portion 21 has a circular cross-sectional shape. And a flat plate extending in a string shape in the side cutter fitting hole 3 Are those having a wear plate member 5, it can be said to have a configuration which combines the cutting tool Z1 and the cutting tool Z2.

従って、ここでは、この切削工具Ｚ３に特有の構成、即ち、上記刃物２の固定部２１が円形断面形状で且つそれぞれの外周面に上記面摺部２４を備えたことに起因する特有の構成を中心に説明し、上記第１及び第２の実施形態の切削工具Ｚ１、Ｚ２と同一の構成部分については上記第１及び第２の実施形態における該当説明を援用することで、その説明を省略する。 Therefore, here, a configuration peculiar to the cutting tool Z3, that is, a peculiar configuration resulting from the fact that the fixed portion 21 of the cutter 2 has a circular cross-sectional shape and the surface slide portion 24 is provided on each outer peripheral surface. The description will be mainly given, and the description of the same components as the cutting tools Z1 and Z2 of the first and second embodiments will be omitted by using the corresponding descriptions in the first and second embodiments. .

上記刃物嵌着孔３は、図９及び図１１に示すように、円形の断面形状をもつとともに、その一側には該刃物嵌着孔３の弦を形成するように延出する平板状の当板体５が形成されている。 As shown in FIGS. 9 and 11, the blade fitting hole 3 has a circular cross-sectional shape, and a flat plate-like shape that extends to form a chord of the blade fitting hole 3 on one side thereof. The plate body 5 is formed.

即ち、上記当板体５は、上記刃物嵌着孔３をホットワイヤー加工によって上記シャンク１から切り出す際に、該刃物嵌着孔３の内部において弦状に切り出されたものであって、その一端部５ａは上記刃物嵌着孔３の内壁面側に連続する一方、他端部５ｂは上記内壁面と非連続の自由端とされ、しかもその背面側には逃げ部１０が形成されている。従って、この当板体５は、上記一端部５ａ側を支点に、上記刃物嵌着孔３の径方向へ撓曲変形自在とされている。 That is, the abutting plate body 5 is cut out in a string shape inside the blade fitting hole 3 when the blade fitting hole 3 is cut out from the shank 1 by hot wire processing, and one end thereof The portion 5a is continuous to the inner wall surface side of the blade fitting hole 3, while the other end portion 5b is a free end discontinuous with the inner wall surface, and a relief portion 10 is formed on the back side thereof. Therefore, the abutting plate body 5 can be flexibly deformed in the radial direction of the blade fitting hole 3 with the one end portion 5a side as a fulcrum.

また、上記逃げ部１０には、上記シャンク１の外周面１ｂ側からその軸方向に沿って所定間隔で穿設された三個のビス孔７が臨んでいるとともに、該各ビス孔７にはそれぞれ固定ビス６が螺合される。 In addition, the escape portion 10 faces three screw holes 7 drilled at predetermined intervals along the axial direction from the outer peripheral surface 1b side of the shank 1. Each fixing screw 6 is screwed.

一方、上記刃物２は、例えば、超硬合金、サーメット、セラミック等の超硬質材で一体形成されるものであって、図９に示すように、円形の断面形状をもつ丸棒状の固定部２１と、該固定部２１の上端に連続して形成され且つ１８０°の回転位相をもって一対の切刃２３を設けた刃部２２とを備えて構成される。さらに、上記固定部２１の一側には、面摺り加工によって、平坦な面摺部２４が形成されている。尚、この面摺部２４の幅寸法は上記シャンク１側の上記当板体５の幅寸法に対応するように設定され、また該面摺部２４の長さは上記シャンク１側の上記各固定ビス６に対応するように設定されている。 On the other hand, the blade 2 is integrally formed of a super hard material such as cemented carbide, cermet, ceramic, etc., and as shown in FIG. 9, a round bar-shaped fixing portion 21 having a circular cross-sectional shape. And a blade portion 22 formed continuously with the upper end of the fixed portion 21 and provided with a pair of cutting blades 23 with a rotation phase of 180 °. Further, a flat surface slide portion 24 is formed on one side of the fixed portion 21 by surface treatment. The width dimension of the surface sliding portion 24 is set so as to correspond to the width dimension of the plate body 5 on the shank 1 side, and the length of the surface sliding portion 24 is fixed to each of the fixed portions on the shank 1 side. It is set so as to correspond to the screw 6.

以上のように構成された上記シャンク１の上記刃物嵌着孔３に、上記刃物２の上記固定部２１を、側刃物嵌着孔３側の上記当板体５と上記刃物２側の上記面摺部２４が対向するようにして嵌挿し且つこれを上記各固定ビス６によって固定保持することで、図１０に示すように、上記切削工具Ｚ３が得られる。 The fixing part 21 of the blade 2 is inserted into the blade fitting hole 3 of the shank 1 configured as described above, and the abutting plate body 5 on the side blade fitting hole 3 side and the surface on the blade 2 side. As shown in FIG. 10, the cutting tool Z <b> 3 is obtained by inserting the sliding portion 24 so as to face each other and fixing and holding the sliding portion 24 with the fixing screws 6.

この場合、図１２に示すように、上記固定ビス６の締め込みによって上記当板体５が上記一端部５ａ部分から上記刃物嵌着孔３の内方側へ撓曲変形してその表面が上記刃物２側の上記面摺部２４に当接し、さらにこれを締め込むことで、上記刃物２の固定部２１は、上記刃物嵌着孔３の内壁面に圧接され、該内周面と上記当板体５の間で、その周方向の大部分が挟圧支持されることになる。 In this case, as shown in FIG. 12, the abutment plate 5 is bent and deformed from the one end portion 5a to the inner side of the blade fitting hole 3 by tightening the fixing screw 6, and the surface thereof is By abutting and tightening the chamfered portion 24 on the blade 2 side, the fixed portion 21 of the blade 2 is pressed against the inner wall surface of the blade fitting hole 3, and the inner peripheral surface is in contact with the contact surface. Between the plate bodies 5, most of the circumferential direction is supported by pressing.

この結果、上記刃物２の上記固定部２１の上記面摺部２４以外の部分には上記刃物嵌着孔３の内壁面との間に摩擦力が発生し、また上記面摺部２４部分には上記当板体５との間の押圧力によって摩擦力が発生することから、上記刃物２はこれらの摩擦力によって上記シャンク１側に固定保持され、高い固定保持力が確保される。さらに、上記刃物２の固定部２１側の上記面摺部２４と上記シャンク１側の上記当板体５が上記刃物２とシャンク１の相対回転方向において係合することでその相対回転が規制される。これら両者の相乗作用によって、円形の軸方向断面形状をもつ刃物２の上記シャンク１側への固定保持がより一層確実ならしめられ、延いては、上記切削工具Ｚ３の精度上の信頼性が向上することになる。 As a result, a frictional force is generated between the fixed portion 21 of the cutter 2 other than the chamfered portion 24 and the inner wall surface of the cutter fitting hole 3, and the chamfered portion 24 portion has a frictional force. Since a frictional force is generated by the pressing force between the plate body 5, the cutter 2 is fixed and held on the shank 1 side by these frictional forces, and a high fixing holding force is secured. Further, the relative rotation of the blade 2 is restricted by engaging the surface slide portion 24 on the fixed portion 21 side of the cutter 2 and the plate body 5 on the shank 1 side in the relative rotation direction of the cutter 2 and the shank 1. The Due to the synergistic action of these two, the blade 2 having a circular axial cross-sectional shape can be more securely fixed and held on the shank 1 side, and the reliability of the cutting tool Z3 can be improved. Will do.

さらに、上記当板体５が上記シャンク１に設けられた上記刃物嵌着孔３の内壁面の一部から切り出されたもので上記シャンク１と一体化されていることから、上記固定ビス６の締め込み時に上記当板体５との間に発生する摩擦力によって該当板体５に締め込み方向への回転力が作用しても、該刃物２には上記当板体５側からの押し付け力のみが伝達され、上記回転力は上記刃物２側には伝達されない。このため、上記固定ビス６の締め込み時における上記刃物２の回転変位による位置ズレ、即ち、「初期位置ズレ」が確実に防止され、それだけ切削工具Ｚ３の精度上の信頼性がさらに高められることになる。 Further, since the abutting plate body 5 is cut out from a part of the inner wall surface of the blade fitting hole 3 provided in the shank 1 and integrated with the shank 1, the fixing screw 6 Even if a rotational force in the tightening direction acts on the corresponding plate body 5 due to a frictional force generated between the plate body 5 at the time of tightening, the pressing force from the side of the plate body 5 is applied to the blade 2. Only the torque is transmitted, and the rotational force is not transmitted to the blade 2 side. For this reason, the positional deviation due to the rotational displacement of the blade 2 when the fixing screw 6 is tightened, that is, the “initial positional deviation” is surely prevented, and the reliability on the accuracy of the cutting tool Z3 is further enhanced accordingly. become.

尚、上記各実施形態においては、上記刃物２として二つの切刃２３を備えた二枚刃構造のものを例にとって説明したが、本願発明は上記刃物２の刃部２２の構造、例えば、上記切刃２３の数とか形状等には何等制約されないことはいうまでもない。 In each of the above-described embodiments, the two-blade structure having two cutting blades 23 as the cutter 2 has been described as an example. However, the present invention relates to the structure of the blade portion 22 of the cutter 2, for example, Needless to say, the number and shape of the cutting blades 23 are not limited.

本願発明の第１の実施形態に係る切削工具の分解斜視図である。 It is a disassembled perspective view of the cutting tool which concerns on 1st Embodiment of this invention. 図１に示した切削工具の組付け状態を示す斜視図である。 It is a perspective view which shows the assembly | attachment state of the cutting tool shown in FIG. 図１のＩＩＩ−ＩＩＩ拡大断面図である。 It is III-III expanded sectional drawing of FIG. 図２のＩＶ−ＩＶ拡大断面図である。 It is IV-IV expanded sectional drawing of FIG. 本願発明の第２の実施形態に係る切削工具の分解斜視図である。 It is a disassembled perspective view of the cutting tool which concerns on 2nd Embodiment of this invention. 図５に示した切削工具の組付け状態を示す斜視図である。 It is a perspective view which shows the assembly | attachment state of the cutting tool shown in FIG. 図５のＶＩＩ−ＶＩＩ拡大断面図である。 It is VII-VII expanded sectional drawing of FIG. 図６のＶＩＩＩ−ＶＩＩＩ拡大断面図である。 It is a VIII-VIII expanded sectional view of FIG. 本願発明の第３の実施形態に係る切削工具の分解斜視図である。 It is a disassembled perspective view of the cutting tool which concerns on 3rd Embodiment of this invention. 図９に示した切削工具の組付け状態を示す斜視図である。 It is a perspective view which shows the assembly | attachment state of the cutting tool shown in FIG. 図９のＸＩ−ＸＩ拡大断面図である。 It is XI-XI expanded sectional drawing of FIG. 図１０のＸＩＩ−ＸＩＩ拡大断面図である。 It is XII-XII expanded sectional drawing of FIG.

Explanation of symbols

１・・シャンク
２・・刃物
３・・刃物嵌着孔
４・・付勢体
５・・当板体
６・・固定ビス
７・・ビス孔
２１・・固定部
２２・・刃部
２３・・切刃
２４・・面摺部
Ｚ１・・切削工具
Ｚ２・・切削工具
Ｚ３・・切削工具1 ·· Shank 2 · · Blade 3 · · Blade fitting hole 4 · · Biasing body 5 · · Plate 6 · · Fixing screw 7 · · Screw hole 21 · · Fixing portion 22 · · Blade portion 23 ·· Cutting blade 24 ・・ Surface Z1 ・・ Cutting tool Z2 ・・ Cutting tool Z3 ・・ Cutting tool

Claims

The fixing portion (21) of the blade (2) is inserted into the blade fitting hole (3) opened on the tip surface (1a) of the shank (1) that is rotationally driven around the axis, and the fixing portion (21). A cutting tool formed by pressing and fixing with a fixing screw (6) provided on the outer peripheral surface (1b) of the shank (1),
A predetermined range including a portion corresponding to the fixed screw (6) in the circumferential direction of the inner wall surface of the blade fitting hole (3) is formed integrally with the shank (1) and the fixed screw ( 6. A cutting tool comprising the abutting plate body (5) which receives the pressing force of 6) and is displaced inward of the blade fitting hole (3).

In claim 1,
The plate body (5) is shaped like a plate in a state where a part of the inner wall surface of the blade fitting hole (3) is connected to the inner wall surface at one end (5a) in the circumferential direction of the inner wall surface. A cutting tool having a cut-out configuration.

In claim 1 or 2,
While the fixed part (21) of the blade (2) has a rectangular axial cross-sectional shape,
The blade fitting hole (3) has a rectangular axial cross-sectional shape, and the plate body (5) constitutes one side of the inner wall surface of the blade fitting hole (3) and one end thereof. The portion (5a) is continuous to one corner of the one side, and the other end (5b) is a free end separated from the inner wall surface in the vicinity of the other corner of the one side. Cutting tools.

In claim 1 or 2,
While the fixed part (21) of the blade (2) has a circular axial cross-sectional shape,
The blade fitting hole (3) has a circular axial cross-sectional shape, and the abutting plate body (5) is a curved plate-like shape extending along the inner wall surface of the blade fitting hole (3). A cutting tool characterized in that one end (5a) is continuous with the inner wall surface and the other end (5b) is a free end radially spaced from the inner wall surface.

In claim 4,
The pressing direction at the contact position of the fixing screw (6) with the abutting plate body (5) is set in a direction inclined toward the other end (5b) side of the abutting plate body (5) with respect to the vertical direction. A cutting tool characterized by

In claim 1 or 2,
While the fixed portion (21) of the cutter (2) has a circular axial cross-sectional shape and a flat surface slide portion (24) is provided on the outer peripheral surface thereof,
The blade fitting hole (3) has a circular axial cross-sectional shape, and the plate body (5) is provided on one side of the inner wall surface, and the corresponding plate body (5) is the blade fitting hole. (3) It has a flat plate shape that extends in a string shape inside, and one end (5a) thereof is continuous with the inner wall surface, and the other end (5b) is a free end radially spaced from the inner wall surface. A cutting tool characterized by