JP2008006508A

JP2008006508A - Blade part replacing type cutting tool

Info

Publication number: JP2008006508A
Application number: JP2006175976A
Authority: JP
Inventors: Hisanori Mura; 尚則村
Original assignee: Hitachi Tool Engineering Ltd
Current assignee: Moldino Tool Engineering Ltd
Priority date: 2006-06-27
Filing date: 2006-06-27
Publication date: 2008-01-17

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blade part replacing type cutting tool allowing mounting of a blade part with high accuracy and having high strength without lowering of machining accuracy due to a mounting accuracy change, even under a continuous cutting condition. <P>SOLUTION: In this cutting tool constituted by connecting the blade part 1 and a tool main body 2 via a member 3 for fixing the blade part 1, the blade part 1 and the member 3 are connected by a connecting part 7 and a connecting part 8, a screw part 12 and a screw part 9 are screwed in the tool main body 2 and the member 3, and a connecting part 6 and a guide part 13 are made to abut on each other in substantially parallel to an axis direction. When an angle formed by the axial direction positioning face 5 in cross section of the blade part 1 and a line vertical to the axis is made as θ1° and an angle formed by the axial direction positioning face 17 in cross section of the tool main body 2 and a line vertical to the axis is made as θ2°, 0<θ1≤45 and θ1≤θ2 are formed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本願発明は、刃部とそれを支持する工具本体と刃部固定用部材を含んでなる刃部交換式切削工具に関する。 The present invention relates to a blade part-exchangeable cutting tool comprising a blade part, a tool main body that supports the blade part, and a blade part fixing member.

刃部交換式切削工具において、刃部と工具本体とを固定する方法が特許文献１から３に開示されている。 Patent Documents 1 to 3 disclose a method of fixing a blade part and a tool body in a blade part exchangeable cutting tool.

特開昭６４−２０９１０号公報Japanese Patent Laid-Open No. 64-20910 特表２００１−５０５１３７号公報Special table 2001-505137 特開２００６−５５９８６号公報JP 2006-55986 A

特許文献１、２は、小さい寸法のフライス工具等について交換式切刃の設計上の問題点を解決する技術を開示している。即ち、切刃を有する切削ヘッドを、保持手段を介して工具本体に固定して用いる工具であり、該工具本体の端部に、内面が後方へ先細りしたテーパ状の円錐台形になっている刃部挿入孔を形成し、フック型手段によって連結された該切削ヘッドの端部と該保持手段とを、該刃部挿入孔内に固定して用いる金属切削用工具やフライス工具を提案している。しかし、このような刃部をテーパ形状の当接面のみにて位置決めする構成では、工具軸線上の刃部から工具本体方向に加わる切削背分力と切削トルクによるネジの軸力により、刃部が刃部挿入孔内のテーパ面を押し広げ、刃部の位置が工具本体方向に変動するため、切削時の加工精度が低下してしまう欠点がある。更に、切削加工時に発生する切削熱により、刃部挿入孔が膨張、開口するため、刃部が工具本体側に押し込まれ、加工精度が低下してしまう欠点がある。特許文献３に開示されている刃部交換式切削工具は、軸方向位置決め面を付加した上で、刃部挿入孔をテーパ形状当接面にて押し広げて刃部と工具本体の同軸度を保つ為、刃部の交換を繰り返すうちに刃部挿入孔の弾性力が弱まってしまい、刃部の取り付け精度が低下してしまう欠点がある。更に、切削加工時に発生する切削熱により、刃部挿入孔が膨張、開口するため、刃部の軸心が定まらず工具寿命が低下してしまう欠点がある。
そこで本願発明が解決しようとする課題は、刃部を高精度に取り付けることが可能であり、連続切削加工の条件においても、取り付け精度変化による加工精度低下のなく、高強度な刃部交換式切削工具を提供することである。 Patent Documents 1 and 2 disclose techniques for solving the design problems of replaceable cutting blades for milling tools with small dimensions. That is, a tool that uses a cutting head having a cutting blade fixed to a tool body via a holding means, and has a tapered frustoconical shape with an inner surface tapered rearward at the end of the tool body. A metal cutting tool or a milling tool is proposed in which the end portion of the cutting head and the holding means connected to each other by hook type means are fixed in the blade portion insertion hole. . However, in the configuration in which such a blade portion is positioned only by the tapered contact surface, the blade portion is caused by the cutting back force applied from the blade portion on the tool axis in the tool body direction and the axial force of the screw by the cutting torque. However, since the taper surface in the blade insertion hole is expanded and the position of the blade fluctuates in the direction of the tool body, there is a drawback that the processing accuracy during cutting is lowered. Furthermore, since the blade portion insertion hole expands and opens due to the cutting heat generated during the cutting process, the blade portion is pushed into the tool main body side, resulting in a disadvantage that the processing accuracy is lowered. In the blade part replaceable cutting tool disclosed in Patent Document 3, an axial positioning surface is added, and the blade part insertion hole is widened by a taper-shaped contact surface to increase the coaxiality of the blade part and the tool body. In order to maintain, there is a drawback that the elastic force of the blade portion insertion hole is weakened while the blade portion is repeatedly replaced, and the attachment accuracy of the blade portion is lowered. Furthermore, since the blade portion insertion hole expands and opens due to cutting heat generated during the cutting process, there is a drawback that the axis of the blade portion is not determined and the tool life is reduced.
Therefore, the problem to be solved by the present invention is that the blade portion can be attached with high accuracy, and even under continuous cutting conditions, the cutting strength does not deteriorate due to changes in the attachment accuracy, and the blade portion replaceable cutting with high strength is possible. Is to provide a tool.

本願発明は、刃部１と工具本体２とを刃部固定用部材３を介して連結してなる刃部交換式切削工具において、該刃部１は、軸線方向位置決め面５、接続部６と該接続部６の端部に連結部７を有し、該刃部固定用部材３は、端部に連結部８、他方の端部にネジ部９を有し、該工具本体２は、端部に孔１１と軸線方向位置決め面１７を有し、該孔１１の浅部にガイド部１３、深部にネジ部１２を有し、該刃部１と該刃部固定用部材３とは、連結部７と連結部８とによって連結し、該工具本体２と該刃部固定用部材３とは、ネジ部１２とネジ部９とが螺合し、該接続部６と該ガイド部１３とは軸線方向と略平行に当接し、該刃部１の断面における該軸方向位置決め面５と、軸線と垂直な線とのなす角度をθ１度とし、該工具本体２の断面における該軸方向位置決め面１７と、軸線と垂直な線とのなす角度をθ２度としたとき、０＜θ１≦４５、θ１≦θ２、であることを特徴とする刃部交換式切削工具である。この構成を採用することによって、刃部を高精度に取り付けることが可能であり、連続切削加工の条件においても、取り付け精度変化による加工精度低下のなく、且つ高強度な刃部交換式切削工具を提供することができる。 The present invention relates to a blade part replaceable cutting tool in which a blade part 1 and a tool body 2 are connected via a blade part fixing member 3, and the blade part 1 includes an axial positioning surface 5, a connection part 6, and the like. The connecting portion 6 has a connecting portion 7, the blade portion fixing member 3 has a connecting portion 8 at the end and a screw portion 9 at the other end, and the tool body 2 has an end portion. The hole 11 and the axial positioning surface 17 are provided in the part, the guide part 13 is provided in the shallow part of the hole 11, the screw part 12 is provided in the deep part, and the blade part 1 and the blade fixing member 3 are connected to each other. The tool body 2 and the blade portion fixing member 3 are connected by the portion 7 and the connecting portion 8, and the screw portion 12 and the screw portion 9 are screwed together, and the connection portion 6 and the guide portion 13 are An angle formed between the axial positioning surface 5 in the cross section of the blade portion 1 and a line perpendicular to the axis is θ1 degrees, and abuts in the cross section of the tool body 2. The direction positioning surface 17, when the angle of .theta.2 degrees to the axis perpendicular to the line, 0 <θ1 ≦ 45, θ1 ≦ θ2, a blade portion replaceable cutting tool, characterized in that a. By adopting this configuration, it is possible to attach the blade part with high accuracy, and even under continuous cutting conditions, there is no reduction in machining accuracy due to a change in attachment accuracy, and a high-strength blade part exchangeable cutting tool is provided. Can be provided.

本願発明の刃部交換式切削工具は、該刃部固定用部材３が高強度材料であることが好ましい。また、該刃部１に貫通孔１４、該工具本体２に貫通孔１５、該刃部固定用部材３に貫通孔１６を有し、該貫通孔１４、１５、１６が軸線と平行な方向に連結していることが好ましい。 In the blade part exchangeable cutting tool of the present invention, the blade part fixing member 3 is preferably a high-strength material. Further, the blade portion 1 has a through hole 14, the tool body 2 has a through hole 15, and the blade portion fixing member 3 has a through hole 16. The through holes 14, 15, 16 are in a direction parallel to the axis. It is preferable that they are connected.

本願発明により、刃部を高精度に取り付けることが可能であり、連続切削加工の条件においても、取り付け精度変化による加工精度低下のなく、高強度な刃部交換式切削工具を提供することができた。 According to the present invention, it is possible to attach the blade portion with high accuracy, and it is possible to provide a high-strength blade portion replaceable cutting tool without deterioration in machining accuracy due to a change in attachment accuracy even under continuous cutting conditions. It was.

図１に本発明例１の刃部交換式切削工具について、部分断面形状を示す。本発明例１は１つ以上の切刃を有する刃部１と工具本体２とが刃部固定用部材３を介して連結されている。図２に刃部１を、図３に刃部固定用部材３を、図４に工具本体２を夫々図示する。図１、２に示すように、刃部１は工具本体２と接続する側の端部４に、略円柱形状を含む接続部６が形成されている。連結部７は鍵形に形成されている。また、図３に示すように、刃部固定用部材３の工具回転軸方向の一端にも連結部８が連結部７とかみ合う様に鍵形に形成されており、他端に雄ネジ部９が形成されている。一方、工具本体２には、刃部１の少なくとも接続部６と連結部７及び刃部固定用部材３を挿入する挿入孔１１が形成されている。挿入孔１１の深部には、刃部固定用部材３の雄ネジ部９に対応する雌ネジ部１２が形成されており、挿入孔１１の浅部には、該刃部１の接続部６に当接するガイド部１３が形成されている。そして、鍵形をした連結部７と連結部８とを掛けることにより、刃部１と刃部固定用部材３とが工具の軸方向に連結され、雄ネジ部９を雌ネジ部１２に挿入し、ネジ締めすることにより、刃部固定用部材３と刃部１とが工具本体２に固定される構造になっている。即ち、刃部１を回転させることにより、鍵形をした連結部７、８により連結された刃部固定用部材３も連動して回転し、ネジ部９、１２の締め付け軸力により、刃部固定用部材３を介して、刃部１を挿入孔１１に引き込み工具本体２に固定する構造となっている。
本願発明の特徴は、第１に、刃部１を、刃部固定用部材３を介して工具本体２に固定する場合、接続部６を略円柱形状とし、工具本体２の挿入孔１１内に設定されたガイド部１３と接続することによって、刃部１と工具本体２の軸線を同一線上に固定して、更に円周方向の位置を固定することである。こうすることによって、刃部１は、刃部１から工具本体２に加わる工具軸線に平行に働く切削背分力と、切削トルクによるネジの軸力によって、工具本体２の挿入孔１１を押し広げることなく、取り付け精度が高い刃部交換式切削工具を実現できる。第２に、刃部１の端部１４の外周部に設けた軸方向位置決め面５と、工具本体２の端部に設けた軸方向位置決め面１７とが当接することで、刃部１の工具軸線方向の位置を固定することである。第３に、軸方向位置決め面５と、軸線と垂直な線とのなす角度をθ１度とし、軸方向位置決め面１７と、軸線と垂直な線とのなす角度をθ２度としたとき、０＜θ１≦４５、θ１≦θ２、に設定することである。軸方向位置決め面５を、外周側に向かうにつれて工具本体２の方向に突出し、θ１値を０度＜θ１≦４５度、θ１≦θ２、とすることで、刃部１は、刃部１から工具本体２に加わる工具軸線に平行に働く切削背分力と、切削トルクによるネジの軸力によって、工具本体２の挿入孔１１を絞り込むのことができる。こうすることによって、工具本体２の挿入孔１１が押し広げられるのを妨げ、更に、円柱形状を含む接続部６とガイド部１３の間に設定される取り付けにおける嵌め合いの間隙を解消し、接続部６を工具本体２の挿入孔１１が締め付けて固定するため、高強度且つ取り付け精度が高い刃部交換式切削工具を実現できる。一方、θ１＞４５とした場合、連続使用において軸方向位置決め面５に欠損等が発生する不都合が生じる。特に、刃部１を高硬度で熱膨張係数の小さい超硬合金で作製することにより、刃部挿入孔１１が切削熱により膨張開口することを妨げ、連続切削加工に使用しても、取り付け精度変化による加工精度低下のない刃部交換式切削工具を実現できて好ましい。
このように本願発明は第１、第２、第３の特徴を有しており、これらが相乗的に機能することによって、軸線方向と軸垂直方向の位置変動が少なく、格段に優れた加工精度を有した高強度な刃部交換式切削工具を実現できるのである。 FIG. 1 shows a partial cross-sectional shape of the blade part replaceable cutting tool of Example 1 of the present invention. In the present invention example 1, a blade portion 1 having one or more cutting blades and a tool body 2 are connected via a blade portion fixing member 3. FIG. 2 shows the blade portion 1, FIG. 3 shows the blade portion fixing member 3, and FIG. 4 shows the tool body 2. As shown in FIGS. 1 and 2, the blade portion 1 is formed with a connection portion 6 including a substantially cylindrical shape at an end portion 4 on the side connected to the tool body 2. The connecting portion 7 is formed in a key shape. Further, as shown in FIG. 3, a connecting portion 8 is formed in a key shape so that the connecting portion 8 engages with the connecting portion 7 at one end of the blade fixing member 3 in the tool rotation axis direction, and a male screw portion 9 is provided at the other end. Is formed. On the other hand, the tool body 2 is formed with an insertion hole 11 into which at least the connecting portion 6 and the connecting portion 7 of the blade portion 1 and the blade portion fixing member 3 are inserted. A female screw portion 12 corresponding to the male screw portion 9 of the blade portion fixing member 3 is formed in the deep portion of the insertion hole 11, and the connection portion 6 of the blade portion 1 is formed in the shallow portion of the insertion hole 11. The abutting guide portion 13 is formed. Then, by engaging the key-shaped connecting portion 7 and the connecting portion 8, the blade portion 1 and the blade portion fixing member 3 are connected in the axial direction of the tool, and the male screw portion 9 is inserted into the female screw portion 12. The blade portion fixing member 3 and the blade portion 1 are fixed to the tool body 2 by tightening the screws. That is, by rotating the blade portion 1, the blade portion fixing member 3 connected by the key-shaped connecting portions 7 and 8 also rotates in conjunction with the blade portion by the tightening axial force of the screw portions 9 and 12. The blade portion 1 is pulled into the insertion hole 11 via the fixing member 3 and is fixed to the tool body 2.
The feature of the present invention is that, first, when the blade portion 1 is fixed to the tool body 2 via the blade portion fixing member 3, the connection portion 6 has a substantially cylindrical shape and is inserted into the insertion hole 11 of the tool body 2. By connecting with the set guide part 13, the axis of the blade part 1 and the tool body 2 are fixed on the same line, and the position in the circumferential direction is further fixed. By doing so, the blade portion 1 widens the insertion hole 11 of the tool body 2 by the cutting back force acting parallel to the tool axis applied from the blade portion 1 to the tool body 2 and the axial force of the screw due to the cutting torque. Therefore, it is possible to realize an exchangeable cutting tool with high attachment accuracy. Secondly, the axial positioning surface 5 provided on the outer peripheral portion of the end portion 14 of the blade portion 1 and the axial positioning surface 17 provided on the end portion of the tool body 2 come into contact with each other, so that the tool of the blade portion 1 is brought into contact. It is to fix the position in the axial direction. Third, when the angle formed between the axial positioning surface 5 and a line perpendicular to the axis is θ1 degrees, and the angle formed between the axial positioning surface 17 and the line perpendicular to the axis is θ2 degrees, 0 < θ1 ≦ 45 and θ1 ≦ θ2. The axial positioning surface 5 protrudes in the direction of the tool body 2 toward the outer peripheral side, and the blade portion 1 is moved from the blade portion 1 to the tool by setting the θ1 value to 0 degree <θ1 ≦ 45 degrees and θ1 ≦ θ2. The insertion hole 11 of the tool main body 2 can be narrowed down by the cutting back force acting parallel to the tool axis applied to the main body 2 and the axial force of the screw due to the cutting torque. By doing so, the insertion hole 11 of the tool body 2 is prevented from being expanded, and furthermore, the fitting gap in the attachment set between the connection portion 6 including the columnar shape and the guide portion 13 is eliminated, and the connection Since the insertion hole 11 of the tool body 2 is fastened and fixed to the part 6, it is possible to realize a blade part exchange-type cutting tool with high strength and high attachment accuracy. On the other hand, when θ1> 45, there is a disadvantage that the axial positioning surface 5 is defective in continuous use. In particular, when the blade portion 1 is made of a cemented carbide having a high hardness and a low thermal expansion coefficient, the blade portion insertion hole 11 is prevented from expanding and opening due to cutting heat. It is preferable to realize a blade-exchangeable cutting tool that does not deteriorate the processing accuracy due to changes.
As described above, the present invention has the first, second, and third features, and these function synergistically so that there is little positional fluctuation in the axial direction and the vertical direction, and the processing accuracy is extremely excellent. It is possible to realize a high-strength blade-exchangeable cutting tool having

本願発明の刃部交換式切削工具は、刃部固定用部材３が、例えば熱間ダイス鋼以上の硬さを有する鋼材や高速度工具鋼等の鋼材による高強度材料であることにより、切削耐久性に優れた刃部交換式工具を実現でき好ましい。刃部１の少なくとも１部は、例えば超硬合金、サーメット、セラミックス、ｃＢＮなどの高硬度材料であることが好ましい。また、刃部１に貫通孔１４、工具本体２に貫通孔１５、刃部固定用部材３に貫通孔１６を形成するとともに、貫通孔１４、１５、１６を連結することにより、切刃の近傍に切削油剤や圧縮空気、オイルミスト等を刃部先端から直接供給することができ、切屑除去性と刃部冷却性に優れ、高硬度材をより高能率に切削することが可能な刃部交換式切削工具を実現でき、好ましい。本願発明の刃部交換式切削工具は、第１から第３の特徴を有するものであり、微細部分を適宜変形しても良い。また、刃部１の切刃形状を変更することにより、ドリル、リーマ等の様々な刃部交換式切削工具に適用できる。以下、本願発明の実施例の１形態を説明する。 The blade part replaceable cutting tool of the present invention has a cutting durability because the blade fixing member 3 is a high-strength material such as a steel material having a hardness higher than that of hot die steel or a high-speed tool steel, for example. It is preferable because a blade part replaceable tool having excellent properties can be realized. At least one part of the blade part 1 is preferably a high-hardness material such as cemented carbide, cermet, ceramics, cBN, or the like. In addition, the through hole 14 is formed in the blade portion 1, the through hole 15 is formed in the tool body 2, the through hole 16 is formed in the blade fixing member 3, and the through holes 14, 15, 16 are connected to each other, thereby the vicinity of the cutting blade. Cutting fluid, compressed air, oil mist, etc. can be supplied directly from the tip of the blade, cutting edge removal and blade cooling are excellent, and blade replacement that can cut high-hardness materials more efficiently A cutting tool can be realized, which is preferable. The blade part replaceable cutting tool of the present invention has the first to third characteristics, and the fine portion may be appropriately deformed. Moreover, by changing the cutting edge shape of the blade part 1, it can be applied to various blade part exchangeable cutting tools such as a drill and a reamer. Hereinafter, an embodiment of the present invention will be described.

図５は本発明例２の刃部交換式エンドミルの例を示す。刃部１は工具径８ｍｍの３枚刃ボール形エンドミル形状を有する。刃部１の材質は、ＷＣ−Ｃｏ系超硬合金から作製し、アークイオンプレーティング法を用いて、（ＴｉＳｉ）Ｎ系皮膜の被覆処理を施した。工具本体２と刃部固定用部材３はＨＲＣ４５のＳＫＤ６１材から作製した。刃部１の接続部６はφ６の円柱形状とし鍵形をした連結部７を形成した。また、刃部固定用部材３は工具回転軸方向の一端に、連結部７と同様な鍵形をした連結部８を備え、その他端にＭ５の雄ネジ部９を形成した。一方、工具本体２の刃部挿入孔１１内には、刃部１の接続部６と当接する円柱状ガイド部１３における嵌め合いの間隙を８μｍで浅部に形成し、深部には刃部固定用部材３の雄ネジ部９に対応するＭ５の雌ネジ部１２を形成した。そして、連結部７と連結部８とを掛けることにより、刃部１と刃部固定用部材３とを工具の軸方向に連結し、雄ネジ部９を雌ネジ部１２に挿入し、締め付けることにより、接続部６を挿入孔１１内に引き込み、刃部１を工具本体２に固定する構造にした。刃部１の軸方向位置決め面５は、外周に向かうにつれて、工具本体２方向に、θ１を３０度、θ２を３２度に設定した。軸方向位置決め面５と軸方向位置決め面１７との当接面は、外周部から接触する略相対形状にして、両者を当接させた。 FIG. 5 shows an example of a blade part replaceable end mill according to Example 2 of the present invention. The blade portion 1 has a three-blade ball end mill shape with a tool diameter of 8 mm. The material of the blade part 1 was made of a WC-Co-based cemented carbide and was coated with a (TiSi) N-based film using an arc ion plating method. The tool body 2 and the blade fixing member 3 were made of SRC61 material of HRC45. The connecting part 6 of the blade part 1 is a cylindrical part of φ6 and has a key-like connecting part 7. Further, the blade portion fixing member 3 was provided with a connecting portion 8 having a key shape similar to the connecting portion 7 at one end in the tool rotation axis direction, and an M5 male screw portion 9 was formed at the other end. On the other hand, in the blade portion insertion hole 11 of the tool body 2, a fitting gap in the cylindrical guide portion 13 that contacts the connection portion 6 of the blade portion 1 is formed as a shallow portion with a thickness of 8 μm, and the blade portion is fixed to the deep portion. An M5 female screw portion 12 corresponding to the male screw portion 9 of the member 3 was formed. Then, by connecting the connecting portion 7 and the connecting portion 8, the blade portion 1 and the blade portion fixing member 3 are connected in the axial direction of the tool, and the male screw portion 9 is inserted into the female screw portion 12 and tightened. Thus, the connection portion 6 is drawn into the insertion hole 11 and the blade portion 1 is fixed to the tool body 2. The axial positioning surface 5 of the blade part 1 was set to 30 degrees and θ2 to 32 degrees in the direction of the tool body 2 toward the outer periphery. The abutting surfaces of the axial positioning surface 5 and the axial positioning surface 17 have a substantially relative shape that comes into contact with the outer peripheral portion, and abut each other.

本願発明の刃部交換式切削工具の性能を確認するため、比較例３、４を作製した。比較例３、４は、本発明例２の寸法、形状を基本として特許文献１、２で開示されているテーパ型刃部交換式工具を参考に作製した。作製した本発明例２と比較例３、４を用いて、切削加工前後の工具長変化と刃部の振れ精度とを測定し、工具特性を評価した。評価方法は、切削加工前後の工具長変化を、評価工具をマシニングセンタの主軸に取り付け、加工前と、切削加工５分後、切削加工３０分後で夫々工具長を測定し、寸法変化量ΔＬを評価した。工具長測定部の基準となる工具先端を使用しないように肩削り加工とし、切り込み深さ量づつ掘り下げた。刃先振れ精度は、レーザー式工具径測定器を使用し、３枚の刃それぞれの工具径を測定し、そのバラツキを工具振れとして評価した。
（加工条件）
被削材：Ｓ５０Ｃ
加工方法：肩削り加工
切削速度：２２０ｍ／ｍｉｎ
送り速度：２６００ｍｍ／ｍｉｎ
切り込み幅：ａｅ＝３ｍｍ
切り込み深さ：ａｐ＝１．０ｍｍ
基準の工具突き出し長さ：４０ｍｍ
切削加工時間に対する工具長変化の測定結果を図６に示す。図６より、本発明例２は切削加工５分後にΔＬ値は４μｍ短くなり、３０分後でも６μｍ短くなるのにとどまり、高精度に連続加工を行うことができた。これは、刃部１に上記の軸方向位置決め面５を形成し、軸方向位置決め面５を、外周に向かうにつれて、θ１を３０度、θ２を３２度に形成することにより、工具本体２に設けた刃部１の挿入孔１１が、力学的及び熱的に開口することを妨げたためである。一方、比較例品３、４は、夫々、切削加工５分後にΔＬ値は２０μｍと１７μｍ短くなり、３０分後には３４μｍ、２６μｍと大きく工具長が変化を示し、取り付け精度変化や加工精度低下を招いた。また表１に、図６における連続切削３０分後に測定した刃部の振れ精度を示す。刃部は３枚刃であることから、夫々Ａ刃、Ｂ刃、Ｃ刃とした。 In order to confirm the performance of the blade part replaceable cutting tool of the present invention, Comparative Examples 3 and 4 were produced. Comparative Examples 3 and 4 were produced with reference to the taper-type blade part replaceable tool disclosed in Patent Documents 1 and 2 on the basis of the size and shape of Example 2 of the present invention. Using the produced Example 2 of the present invention and Comparative Examples 3 and 4, the change in the tool length before and after cutting and the runout accuracy of the blade were measured, and the tool characteristics were evaluated. In the evaluation method, the change in the tool length before and after the cutting process is carried out, the evaluation tool is attached to the spindle of the machining center, the tool length is measured before machining, 5 minutes after the cutting process, and 30 minutes after the cutting process. evaluated. Shoulder cutting was performed so as not to use the tip of the tool, which was the reference for the tool length measurement unit, and the depth of cut was dug down. The blade runout accuracy was evaluated by measuring the tool diameter of each of the three blades using a laser-type tool diameter measuring device and evaluating the variation as tool runout.
(Processing conditions)
Work material: S50C
Machining method: Shoulder shaving Cutting speed: 220 m / min
Feeding speed: 2600mm / min
Cutting width: ae = 3 mm
Cutting depth: ap = 1.0mm
Standard tool protrusion length: 40 mm
The measurement result of the tool length change with respect to the cutting time is shown in FIG. As shown in FIG. 6, in Example 2 of the present invention, the ΔL value was shortened by 4 μm after 5 minutes of cutting and only 6 μm after 30 minutes, and continuous machining could be performed with high accuracy. This is provided in the tool body 2 by forming the axial positioning surface 5 on the blade portion 1 and forming the axial positioning surface 5 at 30 degrees and θ2 at 32 degrees toward the outer periphery. This is because the insertion hole 11 of the blade 1 is prevented from opening mechanically and thermally. On the other hand, in Comparative Examples 3 and 4, the ΔL value was shortened by 20 μm and 17 μm after 5 minutes of cutting, and the tool length was greatly changed to 34 μm and 26 μm after 30 minutes. invited. Table 1 shows the runout accuracy of the blade measured after 30 minutes of continuous cutting in FIG. Since the blade part has three blades, the blade A, the blade B, and the blade C were used, respectively.

表１より、本発明例２における刃部の振れの最大値は、１０μｍ以下に留まり、高精度に被削材を加工できた。これは、刃部１の接続部６と、工具本体２のガイド部１３の間に形成される取り付けにおける嵌め合いの間隙を最小限にし、接続部６を工具本体２の挿入孔１１で締め付けて固定する構造にしたためである。一方、比較例３、４は刃部が約２３、３２μｍと大きく振れたため、高精度に加工できなかった。 From Table 1, the maximum value of the runout of the blade portion in Invention Example 2 remained at 10 μm or less, and the work material could be processed with high accuracy. This minimizes the fitting gap in the attachment formed between the connection portion 6 of the blade portion 1 and the guide portion 13 of the tool body 2, and tightens the connection portion 6 in the insertion hole 11 of the tool body 2. This is because the structure is fixed. On the other hand, Comparative Examples 3 and 4 could not be processed with high accuracy because the blade portion greatly swung about 23 and 32 μm.

図１は、本発明例１を正面視した部分断面図を示す。FIG. 1 is a partial cross-sectional view of Example 1 of the present invention when viewed from the front. 図２は、図１に示した刃部１の部分断面図を示す。FIG. 2 shows a partial cross-sectional view of the blade portion 1 shown in FIG. 図３は、図１に示した刃部固定用部材３の断面図を示す。FIG. 3 is a sectional view of the blade portion fixing member 3 shown in FIG. 図４は、図１に示した工具本体２の断面図を示す。FIG. 4 is a sectional view of the tool body 2 shown in FIG. 図５は、本発明例２を正面視した断面図を示す。FIG. 5 shows a cross-sectional view of Example 2 of the present invention when viewed from the front. 図６は、工具長変化量ΔＬを示す。FIG. 6 shows the tool length variation ΔL.

Explanation of symbols

１：刃部
２：工具本体
３：刃部固定用部材
４：刃部の端部
５：刃部の軸方向位置決め面
６：刃部の接続部
７：刃部の連結部
８：刃部固定用部材の連結部
９：刃部固定用部材の雄ネジ部
１０：工具本体の端部
１１：刃部固定用部材の挿入孔
１２：工具本体の雌ネジ部
１３：工具本体のガイド部
１４：刃部の貫通孔
１５：工具本体の貫通孔
１６：刃部固定用部材の貫通孔
１７：工具本体の軸方向位置決め面 1: Blade portion 2: Tool body 3: Blade portion fixing member 4: Edge portion of blade portion 5: Axial positioning surface of blade portion 6: Connection portion of blade portion 7: Connection portion of blade portion 8: Blade portion fixing 9: Male screw portion of blade fixing member 10: End portion of tool body 11: Insertion hole of blade fixing member 12: Female screw portion of tool main body 13: Guide portion of tool main body 14: Through-hole of blade part 15: Through-hole of tool body 16: Through-hole of member for fixing blade part 17: Axial positioning surface of tool body

Claims

In the blade part replaceable cutting tool in which the blade part 1 and the tool body 2 are connected via a blade part fixing member 3, the blade part 1 includes an axial positioning surface 5, a connection part 6, and the connection part 6. The blade fixing member 3 has a connecting portion 8 at the end and a threaded portion 9 at the other end, and the tool body 2 has a hole 11 at the end. And the axial direction positioning surface 17, the guide portion 13 in the shallow portion of the hole 11, the screw portion 12 in the deep portion, and the blade portion 1 and the blade portion fixing member 3 are connected to the connecting portion 7. The tool body 2 and the blade portion fixing member 3 are connected by the portion 8, the screw portion 12 and the screw portion 9 are screwed together, and the connection portion 6 and the guide portion 13 are substantially in the axial direction. The angle between the axial positioning surface 5 in the cross section of the blade portion 1 and a line perpendicular to the axis is θ1 degrees, and the axial position determination in the cross section of the tool body 2 The surface 17, when the angle between the axis and the line perpendicular with .theta.2 degrees, 0 <θ1 ≦ 45, θ1 ≦ θ2 blade unit exchangeable cutting tool, characterized in that the,.

The blade part exchangeable cutting tool according to claim 1, wherein the blade part fixing member 3 is a high-strength material.

The blade part replaceable cutting tool according to claim 1, wherein the blade part 1 has a through hole 14, the tool body 2 has a through hole 15, and the blade part fixing member 3 has a through hole 16. The through hole 14, 15, 16 is connected in a direction parallel to the axis, and the blade part replaceable cutting tool is characterized in that