JPH0642001U - Indexable cutting tool - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a throw-away type cutting tool capable of easily attaching and detaching a tip and simplifying the shape of a lever member. [Structure] Side wall 30 forming a tip seat of tool body 24
Is used as a positioning surface, the clamp screw 40 is provided in a screw hole portion formed in the tool body 24 by screwing in a state of being inserted through the through hole of the piece member 42, and is separated from the screw hole portion 44 in the tool body 24. A lever member 50 having a substantially U-shape and a spring are provided in the formed space, and a part of the lower surface side of the piece member 42 is a tool when the clamp screw 40 of the piece member 42 is rotated around the axis. A convex portion 60 that abuts on the upper surface 25 of the main body to incline the piece member 42 and a groove portion 46 formed on the upper surface 25 of the tool main body are engaged so that the rotation range of the piece member 42 is between the clamp position and the standby position. A protruding portion 62 for regulating is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 In this invention, a throw-away tip (hereinafter referred to as "tip") having recesses (including through holes) extending in the thickness direction, such as a bite and a boring bar, is mounted and fixed on a tip seat. Related to the improvement of the insert mounting structure of the throw-away type cutting tool.

[0002]

[Prior art and its problems]

 6 to 8 show an example of a conventional throw-away type cutting tool. The throw-away cutting tools shown in these figures use a lever member 8 (see FIG. 8) having a pin portion 8a that engages with the fastening hole 1a of the tip 1 and a through hole 8b. The lever member 8 is arranged in the space 4 formed in the main body 2 as shown in FIG. 7, and the clamp screw 7 is tightened so that the upper surface of the chip 1 is clamped by the clamp piece 7 in the normal direction of the chip seat 11. On the other hand, while the lever member 8 is tilted by the tail portion 7b of the clamp piece 7, the tip of the pin portion 8a pushes the chip 1 toward the side wall 5 of the chip seat, so that the chip 1 is fixed. It has become.

By the way, in the conventional throw-away type cutting tool as described above, since the clamp screw 10 and the lever member 8 are arranged in a straight line, it is necessary to form the through hole 8b in the lever member 8. There is a problem that the shape of the lever member becomes complicated, and it is difficult to quickly attach and detach the chip, and it has been demanded to improve this.

The present invention has been made in view of the above circumstances, and provides a throw-away type cutting tool in which a tip can be easily attached and detached and the shape of a lever member can be simplified. The purpose is to

[0005]

[Means for Solving the Problems]

 According to the present invention, in a throw-away cutting tool in which a tip having a recess extending in the thickness direction is mounted and fixed on a tip seat provided in a tool body, the tip seat of the tool body is formed. The side wall serves as a positioning surface with which the tip contacts, and a clamp screw is screwed into a screw hole formed in the tool body by inserting the clamp screw through a through hole of a substantially plate-shaped piece member. A lever member having a substantially U-shape is inserted into a space formed in the tool main body so as to be spaced apart from the tool body, and a tip end portion of one end thereof is inserted into the recess of the tip mounted on the tip seat. The other end side tip portion is projected from the upper surface of the tool body, and the other end side tip portion of this lever member is arranged so as to be rotatable around the one end side corner portion as a fulcrum. Attached to the direction of protruding from An elastic body is provided, and a convex portion for abutting the upper surface of the tool body to incline the piece member is provided on a part of the lower surface side of the piece member when the piece member rotates around the axis of the clamp screw. A projection is provided on the upper surface of the tool body, which is engaged with a groove formed in an arc shape about the axis of the clamp screw to regulate the rotation range of the piece member between the clamp position and the standby position. The tip of the other end of the lever member is always in contact with the lower surface of a portion of the piece member that faces the convex portion with the clamp screw interposed therebetween, and covers the upper surface of the chip at the clamp position. The feature is that the chip is not in contact with the upper surface of the chip at the standby position.

[0006]

[Action]

 In the throw-away cutting tool having the above structure, the piece member is always biased toward the head side of the clamp screw by the elastic member via the lever member, and the piece member also rotates in the same direction as the clamp screw rotates. To do. When the clamp screw is tightened from the state where the bridge member is in the standby position, the bridge member rotates to the clamp position where the tip side of the side facing the convex portion covers the chip top surface, and at this position the protrusion rotates. Is regulated. Then, first, the convex portion comes into contact with the upper surface of the tool body, the piece member is tilted with the convex portion as a fulcrum, and a part of the rear surface thereof pushes the other end side tip portion of the lever member downward. As a result, the lever member rotates about the corner on the one end side as a fulcrum, and the tip on one end side presses the chip toward the side wall to fix the chip in the direction orthogonal to the thickness direction.

When the clamp screw is further tightened, the portion of the piece member on the side facing the convex portion tilts toward the chip seat bottom side with the point of contacting the tip of the other end of the lever member as the fulcrum. The tip surface presses the top surface of the chip toward the bottom surface of the chip to fix the chip in the thickness direction.

Further, if the clamp screw is loosened from the above state, the piece member also rotates together with the rotation of the clamp screw, and automatically returns to the standby position. In this state, the chip can be easily attached and detached.

[0009]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. The throw-away cutting tool shown in these figures uses a diamond-shaped flat plate-shaped tip 22 having a mounting hole (recess) 20 extending in the thickness direction at the center as a cutting blade.

A tip seat 26 is formed at the corner of the tool body 24 on the tip side. The chip seat 26 is composed of a smooth seat surface (bottom surface) 28 and a side wall 30 extending in a direction normal to the seat surface 28. The side wall 30 is formed on the side surface of the chip 22 without any gap. The contact surface is a positioning surface that accurately determines the position (blade edge position) of the tip 22 in the direction orthogonal to the thickness direction.

The chip 22 is mounted on the chip seat 26 via a sheet member 32. The sheet member 32 is formed in the same shape as the chip 22 in a plan view, and the thickness thereof is uniform throughout. Further, a through hole 34 having a diameter larger than that of the mounting hole 20 of the chip 22 is formed in the central portion in the thickness direction, and a seat stopper pin 36 is fitted and inserted into the through hole 34 to seat the sheet member 32. Are fixed on the tip seat 26.

A screw hole portion 38 is formed at a position separated from the tip seat 26 of the tool body 24 by a predetermined distance, and a clamp screw 40 is inserted into the screw hole portion 38 to penetrate the piece member 42 having a substantially plate shape. The holes 44 are inserted and screwed together. The screw hole 38 is formed so as to extend in a direction parallel to the normal line direction of the tip seat 26. In the vicinity of the screw hole 38, an arc-shaped groove 46 is formed around the axis of the screw hole 38. The range in which the groove 46 is formed (center angle θ in FIG. 4) is about 62 degrees in the case of the present embodiment, but this angle θ is an appropriate value according to the chip shape. is there. Further, the tool body 24 is formed with a space 48 extending from the center of the seat surface 28 of the tip seat 26 toward the rear of the tool body 24 (FIG. 5). The lever member 50 having a substantially U-shape has its one end side tip portion 52 inserted into the mounting hole 20 of the tip 22, the other end side tip portion 54 protruding from the upper surface 25 of the tool body 24, and one end side thereof. It is rotatably arranged with the corner 56 as a fulcrum. A spring (elastic body) 58 is disposed below the space 48, and biases the other end side tip portion 54 of the lever member 50 in a direction projecting from the upper surface 25.

A pin-shaped convex portion 60 protruding downward is formed on a part of the lower surface side of the piece member 42 (hatched portion in FIG. 1). The convex portion 60 is shaped so as to contact the upper surface 25 of the tool body and incline the piece member 42 when the clamp screw 40 of the piece member 42 is rotated around the axis. Further, on the lower surface of the piece member 42, a pin-shaped projection portion 62 that extends downward and engages with the groove portion 46 is formed. Due to the protrusions 62, the piece member 42 has its rotation range in a clamp position (a position where the chip 22 is accurately clamped, a position shown by a solid line in FIG. 1) and a standby position (where the chip 22 is completely clamped). At the open position, it is regulated between the positions shown by the phantom line in FIG. 1.).

A portion 61 of the piece member 42 that faces the convex portion 60 with the clamp screw 40 interposed therebetween (hereinafter, referred to as “opposing portion” in the detailed description of the present invention) 61 is shown in FIG. As described above, the other end side tip portion 54 of the lever member 50 is always in contact with the lower surface, and the tip end side portion (the side close to the tip seat 26) 61a of the facing portion 61 is at the clamp position. Covers the upper surface (a part) of the chip 22 and does not contact the upper surface of the chip 22 at the standby position.

In the throw-away cutting tool according to the above configuration, the piece member 42 is always urged toward the head side of the clamp screw 40 by the spring 58 via the lever member 50, and the piece is rotated along with the rotation of the clamp screw 40. The member 42 also rotates in the same direction.

When the chip 22 is clamped, the chip 22 is first placed on the sheet member 32 as described above in a state where the piece member 42 is initially in the standby position (the position shown in phantom in FIG. 1). Then, from this state, the clamp screw 40 is rotated clockwise and tightened.

Then, the piece member 42 rotates together with the clamp screw 40, and the piece member 42 rotates to a position where the tip end side portion 61a of the facing portion 61 covers the upper surface of the chip 22, that is, a clamping position. Thus, the protrusion 62 restricts the rotation. Then, the convex portion 60 first contacts the tool body upper surface 25, and the piece member 42 tilts in the direction in which the facing portion 61 approaches the upper surface 25 (direction of arrow A in FIG. 3) with the convex portion 60 as a fulcrum. Due to the tilting of the bridge member 42, the lever member 50 is pressed downward with the other end side tip portion 54, and rotates with the one end side corner portion 56 as a fulcrum. Then, the tip 22 presses the tip 22 toward the side wall 30 by the tip portion 52 on one end side, whereby the tip 22 is fixed in the direction orthogonal to the thickness direction.

When the clamp screw 40 is continuously tightened, the facing portion 61 of the bridge member 42 has its tip end portion 61 a seated with the point of contacting the other end side tip portion 54 of the lever member 50 as a fulcrum. Inclining to the surface 28 side (arrow B direction in FIG. 2), the upper surface of the chip 22 is pressed in the normal direction of the chip seat 26. As a result, the chip 22 is fixed in the thickness direction.

When the clamp of the chip 22 is released, if the clamp screw 40 is rotated counterclockwise to loosen it from the above-mentioned clamped state, the piece member 42 also rotates together with the rotation of the clamp screw 40, and the waiting position Automatically returns to. At this time, the lever member 50 is restored to the initial state (state before tightening) by the spring 58, and the fixing of the tip 22 in the direction orthogonal to the thickness direction is also automatically released. In this state, the chip 22 can be easily attached and detached.

In the above example, the cutting tool is shown as an example of the throw-away type cutting tool, but the present invention is not limited to this, and for example, a chip such as a boring bar in which a recess extending in the thickness direction is formed. Any slow-away type cutting tool can be used by mounting on the tip seat.

[0021]

[Effect of device]

 As described above, according to the throw-away cutting tool according to the present invention, the side wall forming the tip seat of the tool body serves as the positioning surface with which the tip abuts, and the screw hole portion formed in the tool body. The clamp screw is inserted into the through hole of the substantially plate-shaped piece member and screwed together, and in the space formed in the tool body apart from the screw hole, the lever member having a substantially U-shape is attached. Insert the tip end of the one end side into the recess of the tip mounted on the tip seat, project the tip end of the other end side from the top surface of the tool body, and rotatably arrange the tip end side corner part as a fulcrum. And an elastic body for urging the tip of the other end of the lever member in a direction projecting from the upper surface of the tool body, and the clamp screw of the piece member is provided at a part of the lower surface side of the piece member. When rotating around the axis of The convex portion that abuts the upper surface of the tool member to incline the piece member and the groove formed in an arc shape around the axis of the clamp screw on the upper surface of the tool body to engage the turning range of the piece member at the clamp position. A protruding portion is provided between the lever member and the standby position, and the tip of the lever member at the other end of the lever member always abuts the lower surface of the piece member on the side facing the protrusion with the clamp screw in between. Since the shape covers the upper surface of the chip at the clamp position and does not contact the upper surface of the chip at the standby position, the chip can be easily and quickly attached and detached only by rotating the clamp screw. Moreover, the shape of the lever member can be simplified, and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view showing a throw-away type cutting tool according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a view from the direction of the arrow III in FIG.

FIG. 4 is a plan view showing the shape of a tool body (holder) of the throw-away cutting tool according to the embodiment.

5 is a cross-sectional view of the tool body of FIG.

FIG. 6 is a plan view showing a conventional throw-away type cutting tool.

7 is a sectional view taken along line VII-VII of FIG.

FIG. 8 is a perspective view of the lever member of FIG.

[Explanation of symbols]

 20 chip recess 22 chip 26 chip seat 38 screw hole 40 clamp screw 42 piece member 46 groove 48 space 50 lever member 52 one end side tip (lever member) 54 the other end side tip (lever member) 56 one end side corner (Lever member) 58 Elastic body 60 Convex portion (piece member) 62 Protrusion portion (piece member)

Claims (1)

[Scope of utility model registration request] 1. A throw-away type cutting tool in which a throw-away tip, in which a recess extending in the thickness direction is formed, is mounted and fixed on a tip seat provided in a tool body. The side wall to be formed is a positioning surface with which the throw-away tip comes into contact, and the clamp screw is screwed into the screw hole portion formed in the tool body by inserting it through the through hole of the substantially plate-shaped piece member. A lever member having a substantially U-shape is provided in a space formed in the tool body so as to be separated from the screw hole, and the one end side tip portion of the lever member is mounted on the tip seat to form the recess of the throw-away tip. The other end side tip end of the lever member is inserted into the inside of the tool body, and the other end side tip end part of the lever body is protruded from the upper surface of the tool body. An elastic body for urging the portion in a direction projecting from the upper surface of the tool body is provided, and a part of the lower surface side of the piece member is provided with a tool body of the tool body when the clamp screw of the piece member is rotated around the axis. A convex portion that abuts the upper surface to incline the piece member, and a groove portion formed in an arc shape around the axis of the clamp screw on the upper surface of the tool body is engaged so that the rotation range of the piece member is the clamp position. A protruding portion for regulating is provided between the standby positions, and a portion of the piece member on a side facing the convex portion with the clamp screw interposed therebetween is such that the other end side tip portion of the lever member is always on the lower surface. A throw-away cutting tool which is in contact with and covers the upper surface of the throw-away tip at the clamp position and does not contact the upper surface of the throw-away tip at the standby position.