JPH10217009A - Tool holder attaching device for machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To highly accurately attach a tool holder to a tool rest with ease by a two face constraint and one shaft clamping method and miniaturize the tool rest. SOLUTION: The parallelism of a tool holder 10 is maintained in the X and Z directions by jointing the constraint faces 11 and 12 of the tool holder 10 to the two flat faces 21 and 22 of a turret 20, which are adjacent to each other. A clamp shaft 14 is projected in the direction of the bisector of the angle between the constraint faces 11 and 12 to be inserted into the insertion hole 24 of the turret 20, determining the center height of the tool holder 10 in the Y direction. A clamp piece 26 is tightened by a clamp bolt 27, clamping the clamp shaft 14 so as to be pulled, and the constraint faces 11 and 12 are pressed against the flat faces 21 and 22, determining the datum position of the tool holder 10 in the turning direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for mounting a tool holder on a tool stand of a machine tool.

[0002]

2. Description of the Related Art For example, when a tool holder for holding a cutting tool is mounted on a tool post on a lathe, it is important that mounting accuracy such as a center height and a parallelism, reproducibility of accuracy at the time of repetition of attachment and detachment, and ease of attachment and detachment are important. Is seen. In particular, in the case of a compound lathe in which a tool post has a milling function, it is necessary to attach a tool holder such as a drill or an end mill to the tool post with high accuracy.

FIGS. 3 to 6 show a conventional tool holder mounting device. An apparatus according to a first conventional example shown in FIG. 3 is a tool post 30 of a lathe.
1a and 31b are perpendicular to two orthogonal planes 32a and 32 of the turret 32.
b, maintaining the parallelism in the X direction and the Z direction, fitting the positioning pins 32c into the holes 31c, securing the core height in the Y direction, and tightening the four bolts 33, and the tool holder 31 is configured to be attached to the turret 32.

[0004] In the device of the second conventional example shown in FIG. 4, a clamp shaft 35a of a tool holder 35 is inserted into a clamp hole 36a of a turret 36 to determine a reference position in the X and Y directions. 35b is the end surface 36 of the turret 36
b, the parallelism in the Z direction is maintained, the positioning pin 36c is fitted in the hole 35c, the reference position in the turning direction is determined, the clamp shaft 37a is clamped by the clamp piece 37, and the tool holder is clamped. 35 is configured to be attached to the turret 36.

The apparatus of the third conventional example shown in FIG. 5 is configured so that both a standard tool holder (not shown) for a cutting tool and a tool holder 40 for an end mill can be mounted on a turret 39 of a combined tool rest. The standard tool holder is attached to the turret 39 by the same clamping method as in FIG. In the case of a tool holder 40 for an end mill that requires higher mounting accuracy than a standard tool holder, the clamp shaft 40a of the holder 40 is inserted into the clamp hole 39a of the turret 39,
The hole 40b of the holder 40 is aligned with the positioning pin 3 of the turret 39.
9b, and in addition, another hole 40c of the holder 40 is fitted to the eccentric pin 39c of the turret 39. The set bolt 41 and the fixing bolt 42 screwed to the holder 40
After the eccentric pin 39c is pinched by the above to determine the reference position in the turning direction, the clamp shaft 43 is clamped by the clamp piece 43.

[0006] In a conventional composite tool rest, FIG.
As shown in (1), the tool holder 40 is attached to the outer peripheral portion of the end face of the turret 39, and the drive mechanism 45 of the end mill 44 is built in the outer peripheral portion of the tool rest body 46. The drive mechanism 45 transmits the power of the motor 47 to the belt 48 and the rotating shaft 4.
9. It is configured to transmit to the tool holder 40 via the clutch 50.

[0007]

However, the above-mentioned conventional apparatus has the following problems. First conventional example: excellent in mounting accuracy and repetition accuracy, but usually requires the use of four bolts 33 for tightening the tool holder 31, which is cumbersome to attach and detach, and requires a long setup time. Second conventional example: Tool holder 35 is attached to one clamp piece 3
7 can easily be attached and detached, but since there are two fitting parts, errors in the parallelism and center height are likely to occur due to these dimensional tolerances, and there is no problem with a tool post dedicated to turning, but a composite tool that performs end milling In the case of a stand, the mounting error of the holder 35 adversely affects the processing accuracy. Third conventional example: Since the eccentric pin 39c serves as a reference for positioning in the turning direction, an installation error occurs if the position of the set bolt 41 is incorrect, and in order to reduce the error, the set bolt 41 must be carefully positioned in advance. Adjustment is troublesome, and after that, it is necessary to tighten the fixing bolt 42 and the clamp piece 43, and it takes time to attach and detach the tool holder 40.
Further, since the holder 40 is attached to the end face of the turret 39, the tool rest main body 46 is enlarged by the drive mechanism 45, and the interference range with the tailstock 51 is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a tool holder mounting apparatus for a machine tool which can easily mount a tool holder with high precision and can make a tool stand compact. It is in.

[0009]

In order to solve the above-mentioned problems, a tool holder mounting apparatus according to the present invention comprises a pair of restraining surfaces joined to two adjacent planes of a tool base, and a pair of restraining surfaces. A shaft protruding in the direction of approximately two bisecting angles is provided, and the tool base is provided with an insertion hole into which the shaft is inserted, and a member that pulls the shaft into the insertion hole and clamps the member. Is done.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show an apparatus for attaching a tool holder 10 to a turret 20 of a tool rest as a tool rest in a combined lathe. In this case, a two-sided constraint / single-axis clamp system is adopted. That is, a pair of restraining surfaces 11 and 12 are provided on the tool holder 10 at an angle of 90 °, and these restraining surfaces 11 and 12 are joined to two adjacent planes 21 and 22 of the turret 20 to form the tool holder 10. Are positioned in the X direction and the Z direction. A 45 ° slope 13 is formed between the restraint surfaces 11 and 12, and the slope 13 has a clamp shaft 1 as a shaft part.
4 protrudes in the direction of the bisector of the angle formed by the restraint surfaces 11 and 12.

On the other hand, a 45 ° chamfer 23 is provided on the outer periphery of the turret 20, and the chamfer 23 is
An insertion hole 24 into which is inserted. The turret 20 is provided with a hole 25 orthogonal to the insertion hole 24, and a clamp piece 26 is slidably inserted into the hole 25. The clamp piece 26 is formed with a meshing portion 26a that meshes with the engaging portion 14a of the clamp shaft 14, and is screwed with a clamp bolt 27. Then, the clamp piece 26 is tightened by the clamp bolt 27, and the clamp shaft 14 is retracted and clamped by the engagement of the engagement portion 26a and the engagement portion 14a.

Therefore, when the tool is mounted, the tool holder 10
The tool holder 10 can be attached to the turret 20 by a simple operation of merely inserting the clamp shaft 14 into the insertion hole 24 of the turret 20 and tightening the clamp bolt 27. In this mounting state, since the clamp piece 26 pulls in the clamp shaft 14 and clamps the clamp shaft 14, the center height of the tool holder 10 in the Y direction is accurately determined by the clamp shaft 14. Also, due to the action of the clamp piece 26, the constraint surfaces 11, 12 of the tool holder 10 become flat surfaces 21,
2, whereby the parallelism of the tool holder 10 in the X direction and the Z direction is accurately maintained, and at the same time, the reference position of the tool holder 10 in the turning direction is accurately determined.

Therefore, the tool holder 10 can be easily mounted on the turret 20 with high precision, and a predetermined mounting precision can be correctly reproduced without the necessity of performing a preliminary adjustment when repeating attachment and detachment. Also, the tool holder 10
Can be attached to the corner of the turret 20, so that the drive mechanism such as the end mill can be stored diagonally in the tool post main body, and the tool post main body can be made compact, thus reducing the interference area between the tool post and the tailstock. It is possible to do.

The tool holder mounting device of the present invention is not limited to a tool post of a lathe, but can be applied to a tool post of various machine tools. In addition, the shape and configuration of each part may be appropriately changed and embodied without departing from the spirit of the present invention.

[0015]

As described in detail above, according to the tool holder mounting apparatus of the present invention, since the two-sided constrained / single-axis clamp system is employed, the tool holder can be easily mounted with high precision, and the tool stand is provided. Has the effect of being compact.

[Brief description of the drawings]

FIG. 1 is a plan view of a tool holder mounting device according to an embodiment of the present invention.

FIG. 2 is a sectional view showing the operation of the device of FIG.

FIG. 3 is a plan view showing a first conventional example of a tool holder mounting device.

FIG. 4 is a plan view showing a tool holder mounting device of a second conventional example.

FIG. 5 is an elevational view showing a third conventional example of a tool holder mounting device.

FIG. 6 is a schematic view showing a problem of the conventional combined tool rest.

[Explanation of symbols]

10 ・ ・ Tool holder, 11,12 ・ ・ Constraint surface 、 14 ・ ・
Clamp shaft, 20 turret, 21, 22, flat
23 ··· Chamfer, 24 ··· Insertion hole, 26 ·· Clamp piece, 27 ·· Clamp bolt.

Claims (1)

[Claims] 1. A tool holder comprising: a pair of constraint surfaces joined to two adjacent planes of a tool stand; and approximately two angles formed by the respective constraint surfaces.
A tool holder for a machine tool, comprising: a shaft protruding in the direction of an equal line; and a tool holder having an insertion hole into which the shaft is inserted, and a member for pulling the shaft into the insertion hole and clamping the same. Mounting device.