JP2007290098A - Cutting tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress breakage of a clamp member in a cutting tool where a cutting insert is attachably/detachably mounted to the tip end part of a tool holder. <P>SOLUTION: The tip end part is equipped with: a mounting seat where the cutting insert is mounted; a screwing part where a clamping member for fixing the cutting insert is screwed; and an inclination part which is provided around the screwing part and becomes low level as being separated from the screwing part. The clamping member is equipped with: a pressing part for pressing the cutting insert; and a rear side part along the inclined part of the tip end, and the inclined part is provided with a positioning part for adjusting the screwing degree on the contact surface with the rear side part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cutting tool used for cutting metal parts.

  2. Description of the Related Art Conventionally, a tool shown in FIG. 2 is known as a cutting tool used for cutting metal parts and the like. In this cutting tool, a cutting insert 2 is placed on a mounting seat 11 formed at the tip of the holder 1, and the clamping member 3 is screwed around the mounting seat 11 in the holder 1 to remove the cutting insert 2. The cutting insert 2 is fixed to the mounting seat 11 by pressing from the upper surface toward the bottom surface of the mounting seat 11.

  In addition, as a method of pressing and fixing the cutting insert to the bottom surface and the side surface of the mounting seat at the same time, Patent Document 1 proposes a configuration in which a presser foot and an L-shaped lever are used in combination. According to this configuration, the presser foot is pushed down by tightening the screw, and a force acts on the upper surface of the cutting insert to press the cutting insert against the bottom surface of the mounting seat, and at the same time, the L-shaped lever rotates on the lever principle. Thus, a force acts on the inner side surface of the hole of the cutting insert, and the tip is pressed against the side surface of the mounting seat.

Further, as a clamping device using only a presser foot that does not use an L-shaped lever, for example, a configuration using the inclination of a tightening screw as disclosed in Patent Document 2 or a holder as disclosed in Patent Document 3 A configuration using an inclined surface is known. Since these clamping devices have a simple structure with a small number of parts compared to the clamping device described in Patent Document 1, the operability is excellent.
Japanese Utility Model Publication No. 2-51006 JP-A-62-255004 Japanese Patent Laid-Open No. 10-71508

  In a cutting tool having a structure in which a cutting insert is fixed to a mounting seat by screwing a clamp member as described above, a person or machine is generally screwed. However, in the screwing operation, it has been difficult to determine whether the clamping member is sufficiently screwed. That is, although the screwing is sufficiently performed, the person or machine that performs the screwing operation cannot recognize that it is sufficient, and the screwing is performed more than necessary. As a result, too much pressure is applied to the clamp member, and there is a problem that the clamp member is broken or the screw thread is damaged.

In addition, in order to avoid damage to the clamp member, if the screwing is insufficient, the cutting insert that receives a large stress during the cutting process moves greatly on the mounting seat, which causes a cutting defect.

  In order to solve these problems, it is conceivable to design appropriately so that a part of the screw head and a part of the holder are in contact with each other at a position where screwing is sufficient. However, when performing the screwing operation, it is not possible to easily recognize that the screwing is sufficient, and the screwing is performed more than necessary, so that the above problem cannot be solved.

  In view of the above problems, the present invention prevents the clamping member from being damaged by preventing the person or machine from screwing the clamping member and attaching the cutting insert to the mounting seat of the holder more than necessary. An object of the present invention is to provide a cutting tool capable of suppressing the above.

  The cutting tool of the present invention is a cutting tool in which a cutting insert is detachably attached to a tip portion of a tool holder, and the tip portion includes a mounting seat to which the cutting insert is attached and a clamp that fixes the cutting insert. A screwing portion to which the member is screwed; and an inclined portion which is provided around the screwing portion and becomes lower as it is separated from the screwing portion, and the clamp member presses the cutting insert And a rear portion along the inclined portion of the tip portion, and the inclined portion is provided with a positioning portion for adjusting the screwing degree on a contact surface with the rear portion. It is characterized by that.

  Moreover, in the said invention, it is preferable that the said positioning part is a convex part or a recessed part, and is fitted with the recessed part or convex part provided in the said back part.

  Moreover, in the said invention, it is preferable that the said positioning part is a rough surface part provided in the said inclination part.

  By using the above configuration, it is possible to know that the screwing is sufficient by detecting the vibration or sound generated when the fitting or the rough surface portion is reached by a person or machine that performs screwing, Breakage of the clamp member can be suppressed.

  In the above invention, the cutting insert has a through-hole or a recess into which a part of the pressing portion of the clamp member is inserted, and is in contact with at least one of the side surfaces of the mounting seat that is the peripheral surface of the mounting seat. The cutting insert is pressed toward the one surface by fitting the convex portion or concave portion provided in the inclined portion and the concave portion or convex portion provided in the rear portion. Is preferred. Thereby, it becomes possible to press a cutting insert to the side surface direction by the side of the clamp member of a mounting seat, and it can prevent that a cutting insert moves on a mounting seat.

  By using the present invention, when the person or machine screws the clamp member and attaches the cutting insert to the mounting seat of the holder, the screwing degree can be adjusted, and the breakage of the clamp member can be suppressed. . In addition, it is possible to prevent the thread from being damaged by screwing more than necessary.

  Hereinafter, a cutting tool according to an embodiment of the present invention will be described in detail.

  The cutting tool according to the present invention is a rod-shaped holder having a mounting seat for attaching a cutting insert to the tip, a cutting insert placed on the mounting surface (bottom surface) of the mounting seat, and pressing the cutting insert to fix it. A clamping member is provided.

  The distal end portion has a screwing portion to which the clamp member is screwed, and the screwing portion is positioned higher than the bottom surface of the mounting seat. Moreover, it has the inclination part which becomes low as it leaves | separates from a screwing part in the direction opposite to the direction in which the attachment seat is formed on the basis of a screwing part.

  Moreover, the clamp member is provided with the press part which presses a cutting insert from an upper surface, and the rear part which follows the inclination part of a front-end | tip part.

  As a feature of the present invention, the inclined portion is provided with a positioning portion for adjusting the screwing condition on the contact surface with the rear portion.

  The positioning part is a convex part or a concave part, and is preferably fitted with a concave part or a convex part provided in the rear part. In this case, it is possible to prevent screws or screws from being unnecessarily screwed by sensing the vibration or sound generated by the fitting between the convex portions and the concave portions by a person or machine that performs the screwing operation.

  Moreover, it is preferable that a positioning part is a rough surface part provided in the inclination part. The rough surface portion has a surface rougher than the other portion with which the rear portion is in contact with the rear portion of the inclined portion. In this case, it is possible to prevent unnecessarily screwing by sensing the vibration generated by the rear part of the clamp member reaching the rough surface part by the person or machine performing the screwing operation.

  The cutting insert is preferably formed with a recess or a through hole into which the tip of the clamp member is inserted. By using this structure, it is possible to prevent the cutting insert from moving on the mounting seat due to the force that presses the cutting insert toward the side surface on the clamp member side of the mounting seat.

  Further, the pressing portion of the clamp member has an insertion portion that is inserted into a recess or a through hole provided in the cutting insert, and an upper surface contact portion that is in contact with the upper surface of the cutting insert and presses toward the bottom surface of the mounting seat. Is preferred. Thereby, in addition to the side surface direction of the mounting seat, a force that sufficiently presses also in the bottom surface direction of the mounting seat works, and it is possible to prevent the cutting insert from moving on the mounting seat in the cutting process.

  As materials for the cutting insert, those conventionally used can be used, and examples thereof include cemented carbides mainly composed of WC, cermets mainly composed of TiC, TiN, TiCN, and the like. The shape of the cutting insert is not particularly limited, and conventionally used polygons such as a triangle, a quadrangle, and a rhombus, and other special shapes such as a circle can be used.

  Moreover, it is preferable that the upper side of the central axis of the screw insertion hole provided in the screwing portion is inclined in the mounting seat direction with respect to the central axis of the cutting insert. This angle may be appropriately set according to the shape of the cutting insert, the shape of the clamp member, and the like, and is not particularly limited, but is preferably about 5 to 20 °.

Moreover, it is preferable that a sheet member is interposed between the cutting insert and the mounting seat. Thereby, when a cutting insert breaks at the time of a cutting process, it can prevent that a mounting seat is also damaged together. As the sheet member, a material made of the same material as the cutting insert can be used, and examples thereof include cemented carbide, cermet or ceramic.

Embodiments of the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, the cutting tool according to the embodiment includes a rod-shaped holder 1 having a mounting seat 11 to which a cutting insert is attached at the tip, and a substantially square mounted on a mounting surface (bottom surface) of the mounting seat 11. A cutting insert 2 made of a flat cemented carbide and a clamp member 3 for pressing and fixing the cutting insert 2 are provided.

  At the tip of the rod-shaped holder 1, a screwing portion 12 provided around the mounting seat 11 and higher than the bottom surface of the mounting seat 11 and to which the clamp member 3 is screwed is attached with reference to the screwing portion 12. It has the inclined part 13 which is located in the opposite direction to the seat 11 and becomes lower as the distance from the screwing part 12 increases.

  The clamp member 3 includes a pressing portion 31 that presses the cutting insert 2 and a rear portion 34 along the inclined portion 13 of the holder 1. The pressing portion 31 includes an upper surface contact portion 33 that comes into contact with the upper surface of the cutting insert 2 and an insertion portion 32 that is inserted into the through hole 21 provided in the cutting insert 2.

  The inclined portion 13 of the holder 1 is provided with a concave portion 15 that functions as a positioning portion, and the rear portion 34 of the clamp member is provided with a convex portion 35 corresponding to the concave portion 15. The clamp member 3 is fitted to the concave portion 15 of the inclined portion 13 and the convex portion 35 of the rear portion 34 by screwing. More specifically, after screwing until the screw head 41 comes into contact with the clamp member 3, when the screwing is further advanced, a part of the pressing force is applied to the rear part 34, and the rear part 34 is applied to the inclined part 13. Although it slides along, the recessed part 15 and the convex part 35 are provided so that the said slide may stop in a predetermined position.

  Further, the central axis C1 of the screw insertion hole 14 provided in the screwing portion 12 is inclined about 5 ° (= θ) with respect to the mounting seat direction with respect to the central axis C2 of the cutting insert 2. Yes. Thereby, the force which presses from the insertion part 32 of the clamp member 3 to the side surface direction of the through-hole 21 of the cutting insert 2, ie, the screwing part 12 side direction of the attachment seat 11 side surface is acting. Further, since the screw insertion hole 14 is inclined as described above, when the screwing is further performed after the rear part 34 contacts the inclined part 13, the rear part 34 is screwed along the inclined part 13. Part of the pressing force in the direction away from the portion 12 increases, and the recess 15 and the projection 35 are easily fitted together, and the fitting causes the insertion portion 32 of the clamp member 3 to push the side of the mounting seat 11. Increases pressure.

  Further, a sheet member 5 made of cemented carbide is interposed between the cutting insert 2 and the mounting seat 11.

  Hereinafter, the attachment process of the cutting insert 2 of the cutting tool which concerns on Example 1 is demonstrated. First, the cutting insert 2 is placed on the mounting seat 11. Next, the insertion portion 32 of the clamp member 3 is inserted into the through hole 21 of the cutting insert 2, and the rear portion 34 is aligned with the position corresponding to the inclined portion 13 of the holder 1.

Then, the screw is tightened into the screw insertion hole 14 of the holder 1 through the screw through hole 36 provided in the clamp member 3. In tightening the screw, the screw head 41 first comes into contact with the clamp member 3. Thereafter, when the screw is further tightened, the screw head 41 is in contact with the clamp member 3, so that a part of the pressing force by screwing is applied to the inclined portion 13 side. This pressing force is further increased by having the space 50 on the inclined member 13 side of the clamp member 3 and the screwing member 12. Thereby, force acts in the direction in which the rear portion 34 slides along the inclined portion 13, and the concave portion 15 of the inclined portion 13 and the convex portion 35 of the rear portion 34 are fitted.

A person or machine that performs the screwing operation senses vibration or sound generated by the fitting so that it can be known that the screwing is sufficient. Therefore, further screwing can be prevented. Further, the insertion portion 32 of the clamp member 3 inserted into the through hole 21 of the cutting insert 2 is also pressed by the slide toward the side surface of the mounting seat 11 to prevent the cutting insert 2 from being detached from the holder 1. Can do.

  Moreover, since the recessed part 15 and the convex part 35 are fitting, it is possible to maintain a pressing force to the mounting seat 11 side surface direction.

  Since the pressing portion 31 of the clamp member 3 has an upper surface contact portion 33 that contacts the upper surface of the cutting insert 2, in addition to the pressing force in the side surface direction of the mounting seat 11, A sufficient pressing force can also be applied.

  In the above embodiment, the cutting insert 2 provided with the through hole 21 is used, but the present invention is not limited to this, and the cutting insert is provided with a concave or convex portion, or no through hole is provided. A flat plate or the like can be used as appropriate.

  Further, by providing an urging member (not shown) such as a spring between the clamp member 3 and the screwing portion 12, the cutting insert 2 can be easily removed and the concave portion and the convex portion are fitted. Can be easily removed and workability can be improved.

  Further, the rear portion 34 only needs to extend along the extending portion 13, and at least a part of the rear portion 34 only needs to be in contact with the extending portion 13.

  The description of the above-described embodiments is to explain the invention, and should not be construed as limiting the invention described in the claims or reducing the scope, and the configuration of each part of the present invention is not limited to the above-described embodiments. Of course, various modifications can be made within the technical scope described in the claims.

It is a longitudinal cross-sectional view of the cutting tool concerning Example 1. FIG. It is a longitudinal cross-sectional view of the conventional cutting tool.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Holder 11 Mounting seat 12 Screw stop part 13 Inclination part 14 Screw insertion hole 15 Recess 2 Cutting insert 21 Through hole 3 Clamp member 31 Press part 32 Insertion part 33 Upper surface contact part 34 Back part 35 Projection part 4 Screw 41 Screw head 5 Sheet Member 50 space

Claims (11)

A cutting tool in which a cutting insert is detachably attached to the tip of a tool holder,
The tip portion is provided at a mounting seat to which the cutting insert is attached, a screwing portion to which a clamp member for fixing the cutting insert is screwed, and provided around the screwing portion and away from the screwing portion. It has an inclined part that becomes lower,
The clamp member includes a pressing part that presses the cutting insert, and a rear part along the inclined part of the tip part,
The cutting tool according to claim 1, wherein a positioning portion for adjusting the screwing degree is provided on a contact surface with the rear portion in the inclined portion. The cutting tool according to claim 1, wherein the positioning part is a convex part or a concave part, and is fitted to a concave part or a convex part provided in the rear part. The cutting tool according to claim 1, wherein the positioning portion is a rough surface portion provided in the inclined portion. The cutting insert has a through-hole or a recess into which a part of the pressing portion of the clamp member is inserted, and is in contact with at least one surface of the mounting seat that is a peripheral surface of the mounting seat, and the inclined The cutting insert is pressed in the direction of the one surface by fitting the convex portion or concave portion provided in the portion and the concave portion or convex portion provided in the rear portion. The cutting tool according to claim 2. A cutting tool in which a cutting insert is detachably attached to the tip of a tool holder,
The tip portion is provided with a mounting seat to which the cutting insert is attached, a screw fastening portion that is positioned higher than the mounting seat and that is clamped with a clamp member that presses the cutting insert from the upper surface, and the screw fastening portion as a reference. And an inclined portion that becomes lower as it goes in the direction opposite to the direction in which the mounting seat is formed,
The clamp member includes a pressing part that presses the cutting insert, and a rear part along the inclined part of the tip part,
The cutting tool according to claim 1, wherein a positioning portion for adjusting the screwing degree is provided on a contact surface with the rear portion in the inclined portion. The cutting tool according to claim 5, wherein the positioning part is a convex part or a concave part, and is fitted to a concave part or a convex part provided in the rear part. The cutting tool according to claim 5, wherein the positioning portion is a rough surface portion provided in the inclined portion. The cutting insert has a through hole or a recess into which a part of the pressing portion of the clamp member is inserted, and is in contact with a side surface on the screwing portion side of the mounting seat, and the positioning portion is The cutting insert is pressed in the side surface direction by fitting a convex portion or a concave portion provided in the inclined portion with a concave portion or a convex portion provided in the rear portion. The described cutting tool. A cutting tool in which a cutting insert is detachably attached to the tip of a tool holder,
The tip portion is provided with a mounting seat to which the cutting insert is attached, a screw fastening portion that is positioned higher than the mounting seat and that is clamped with a clamp member that presses the cutting insert from the upper surface, and the screw fastening portion as a reference. And an inclined portion that becomes lower as it goes in the direction opposite to the direction in which the mounting seat is formed,
The clamp member comprises a pressing part that presses the cutting insert and a rear part along the inclined part of the tip part,
The inclined portion is provided with a positioning portion on a contact surface with the rear portion, and vibration or sound is generated when a part of the rear portion reaches the positioning portion. tool. The central axis of the screw insertion hole provided in the screwing portion is inclined with respect to the central axis of the cutting insert by 5 to 20 degrees in the mounting seat direction. The cutting tool in any one of thru | or 9. The cutting tool according to any one of claims 1 to 10, wherein a sheet member is interposed between the cutting insert and the mounting seat.

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