JPH07195209A - Cutting tool fixing device - Google Patents

Abstract

PURPOSE:To provide a cutting toll fixing device which is capable of firmly fixing a cutting tool and preventing chattering due to component of facing force, and in which a fixing means is not projected from a holder not to interfere with a work. CONSTITUTION:The shank part 5a of a tool 5 is arranged in a cutting tool fixing groove 8 provided in a tool holder 6. A clamping device 12 is provided between the side face 8a of the groove 8 and the shank part 5a through a wedge 9. In this constitution, a hole 13 with counter bore is made to penetrate through the shank part 5a, and an embedded screw 14 is inserted into the hole. The embedded screw 14 is screwed into a screw hole 15 in the bottom face of the fixing groove 8 to tighten and fix the shank part 5a in the groove bottom face of the groove 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool fixing device used in a cutting machine such as a lathe for fixing a tool to a tool holder.

[0002]

2. Description of the Related Art Conventionally, as a structure for fixing a cutting tool to a tool holder in a turret lathe or the like, FIG.
Those shown in (C) are adopted. The structure of (A) has a structure in which the bite fixing groove 52 provided in the tool holder 51 is
The shank portion 53a of the cutting tool 53 is inserted, and the shank portion 53a is attached to the clamp plate 54 of the inclined surface and the wedge 55.
The wedge 55 is clamped to the bottom surface of the groove by a clamp device 57 which is a bolt 56.

The structure (B) uses a clamp device 60 in which a bolt 59 is screwed into a plate 58 which is in contact with the side surface of the bite fixing groove 52, and the shank portion 5 is formed by bulging the bolt 59.
It is a structure for fixing 3a. In addition to this structure, a holding plate 6 tightened with bolts 62 as shown by a chain line.
In some cases, the shank portion 53a is pressed against the bottom surface of the groove. In the structure of (C), one side surface 52a of the bite fixing groove 52 is an inclined surface, and a clamp device 65 is provided between the inclined side surface 52a and the shank portion 53a with a wedge 63 interposed between them and tightened with a bolt 64. Is.

[0004]

Among the components shown in FIG. 5,
In the structure of (B), the shank portion 53 is clamped on one side as shown by the white arrow, so that it cannot be firmly fixed. Especially when cutting the end face as shown in FIG.
The bearing force is weak against the back force F generated on the shank 53.
Since a tends to slip off laterally, so-called chattering is likely to occur. When the presser plate 61 is provided as shown by the chain line, the above-mentioned disengagement can be prevented. However, when the presser plate 61 projects from the holder 51 in this way, the presser plate 61 is pushed by the work W when cutting proceeds. May interfere with the cutting, and the cutting range is limited. In the case of the configurations of (A) and (C), the pressing force acts as shown by the white arrow and two-face restraint is performed, so that the back force F can be supported to some extent. Even with these, the restraint is insufficient, and the back force F may cause chattering.

An object of the present invention is to provide a bite fixing device which can firmly fix a bite and prevent chattering, and in which the fixing means does not project from the holder and there is no problem of interference with a work.

[0006]

According to the bite fixing device of the present invention, the shank portion of the bite is arranged in the bite fixing groove provided in the tool holder, and the shank portion is interposed between the side surface of the groove and the shank portion of the bite. And a clamping device for clamping and fixing the shank portion in the groove. In this structure, a counterbore hole is passed through the shank portion, and an embedded screw is provided which is inserted into the hole and clamps and fixes the shank portion to the bottom surface of the groove of the tool holder.

[0007]

According to this structure, the shank portion of the cutting tool is fixed in the cutting tool fixing groove of the holder by the clamp device, and is further tightened to the bottom surface of the cutting tool fixing groove by the embedded screw. Therefore, even if a back force or the like is applied to the cutting tool when the end surface is cut, the shank portion is prevented from coming out of the tool fixing groove of the holder, and the chattering problem is solved. Further, since it is inserted into the counterbore hole of the cutting tool by using the embedded screw, there is no part protruding from the holder surface, and there is no problem of interference between the work and the cutting tool fixing device.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a partial plan view of a turret lathe to which this tool fixing device is applied. This lathe 1 has a turret carriage 4 on which a turret 3 is mounted, next to a spindle 2 that grips a work W and rotates. The front surface of the turret 3 is a polygonal drum, and the cutting tool 5 is attached to the tool station 3a composed of the peripheral surface parts thereof via the tool holder 6. A rotary tool (not shown) may be attached instead of the bite 5.

The tool holder 6 shown is of a type in which the bite 5 is mounted perpendicularly to the center of the turret, and is formed in an L shape in plan view, and is inserted through a plurality of bolt holes 7 provided as shown in FIG. It is fixed to the turret 3 with a bolt (not shown).

On the surface of the tool holder 6 on the rear side of the turret,
A bite fixing groove 8 is provided so as to open in the turret diameter direction, and the shank portion 5a of the bite 5 is inserted into the groove 8. The bite fixing groove 8 is formed wider than the shank portion 5a, and the groove side surface 8 opposite to the arrangement side of the shank portion 5a.
a is formed in a tapered surface where the groove bottom side is narrowed. A plurality of wedges 9 are fitted between the groove side surface 8a and the shank portion 5a, and these wedges 9 penetrate the bolt holes formed in the wedge 9 and are screwed into the screw holes 10 on the groove bottom surface. Tightening bolt 1
1 is pushed into the groove bottom side. The wedge 9, the tapered groove side surface 8 a, and the wedge tightening bolt 11 are used to clamp the clamp device 1.
2 is configured.

The shank portion 5a of the cutting tool 5 has counterbored holes 13 formed at one or a plurality of positions. The embedded screw 14 is inserted into the hole 13, and the tip of the embedded screw 14 is screwed into the screw hole 15 formed on the groove bottom surface of the bite fixing groove 8, and the shank portion 5a is pressed by the embedded screw 14 against the groove bottom surface. is there.

According to this structure, the shank portion 5a of the cutting tool 5 is fixed in the cutting tool fixing groove 8 of the tool holder 6 in a two-face restrained state by the wedge 9, and further tightened on the bottom surface of the cutting tool fixing groove 8 by the embedded screw 14. To be Therefore, it can be firmly fixed to the bottom surface side of the groove, and the shank portion 5a tends to come out of the tool fixing groove 8 of the tool holder 6 even if the back force or the like during end face cutting strongly acts on the tool 5. It is prevented and the problem of chattering is solved. Also, embedded screw 1
Since it is inserted into the counterbore hole 13 of the cutting tool 5 using No. 4, there is no part protruding from the holder surface, and there is no problem of interference between the work W and the cutting tool fixing device.

3 and 4 show another embodiment. In this example, the tool fixing groove 8 of the tool holder 16 is formed so that the tool 5 is parallel to the turret axis. Since other configurations are the same as those of the above-mentioned embodiment, the corresponding parts are designated by the same reference numerals and the description thereof will be omitted. Even when the tool holder 16 is configured in this manner, the effect of preventing the cutting tool 5 from chattering and the interference with the work of the cutting tool fixing device can be obtained as in the above-described embodiment.

In each of the above embodiments, the clamp device 1
As the bite fixing groove 8, one side surface 8a of one side of the bite fixing groove 8 is tapered, but instead of the clamp device 12, the clamp devices 57 and 6 shown in FIGS. 5 (A) and 5 (B) are used.
You may use 0.

[0015]

According to the bite fixing device of the present invention, the shank portion of the bite is arranged in the bite fixing groove provided in the tool holder, and the clamp device is provided between the side surface of the groove and the shank portion of the bite. In the fixing device, the shank portion is provided with an embedded screw for penetrating a counterbore hole, and the shank portion is inserted into the hole to tighten and fix the shank portion to the bottom surface of the groove of the tool holder. It can be firmly fixed, chatter due to back force etc. at the time of end face cutting can be prevented, and there is no problem that the fixing means does not project from the holder and interferes with the work.

[Brief description of drawings]

FIG. 1 is a perspective view and a sectional view of a cutting tool fixing device according to an embodiment of the present invention.

FIG. 2 is a partial plan view of a turret lathe to which the bite fixing device is applied.

FIG. 3 is a perspective view of a cutting tool fixing device according to another embodiment of the present invention.

FIG. 4 is a partial plan view of a turret lathe to which the bite fixing device is applied.

5A to 5C are cross-sectional views of a conventional example.

FIG. 6 is an explanatory diagram of a back force component during end face cutting.

[Explanation of symbols]

3 ... Turret, 5 ... Tool, 5a ... Shank part, 6 ... Tool holder, 8 ... Tool fixing groove, 9 ... Wedge, 12 ... Clamping device, 13 ... Counterbore hole, 14 ... Embedded screw, 15
… Screw hole, 16… Tool holder, W… Work

Claims (1)

[Claims] 1. A clamp for arranging a shank portion of a cutting tool in a cutting tool fixing groove provided in a tool holder, and interposing a shank portion between a side surface of the groove and a shank portion of the cutting tool to fix the shank portion in the groove. A tool fixing device provided with a device, a shank portion having a counterbore through hole, and an embedded screw which is inserted into the shank portion and clamps and fixes the shank portion to the bottom surface of the groove of the tool holder.