JPS6327121B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a bite clamp device for general machine tools.

Conventionally, when various cutting blades, i.e., cutting tools, are firmly fixed to a tool rest located at a position opposite to the headstock on which a workpiece of a lathe or other machine tool is fixed, the front view in Figure 1A and the front view in Figure 1B are used. As shown in the side sectional view, the cutting tool 3 is inserted into the cutting tool insertion hole 2 provided in the cutting tool holder 1, and the round piece 5 is fitted into the clamp hole 4 on the upper part of the cutting tool. The tightening bolt 7 is screwed into the inclined screw hole 6, and the male screw 7' at the tip of the tightening bolt 7 is screwed into the female screw 1' on the side of the tool holder 1. The tightening force of the bolt 7 is expressed by the round piece 5 as a component force generated by the inclination of the screw hole 6.
It is customary to use a downward pressing force on the circular piece 5 to tighten the cutting tool 3 to perform clamping. In the above configuration, as shown in FIG. 1A, it is necessary to provide the same clamping mechanism at two locations, and the clamping force of the cutting tool 3 by both clamping mechanisms is required to be uniform. This is because if the clamping forces from both clamp mechanisms are uneven, it will not be possible to maintain the balance of the cutting tool 3 well, leading to an unstable situation, and cutting the workpiece will not be possible. When doing so, problems occur in processing accuracy and operation. Therefore, it is essential to maintain the tightening strength of both tightening bolts 7, 7 constant at all times, and when loosening the tightening bolts 7, 7 after tightening them firmly due to changing the tool or other requests. However, it also has the disadvantage that the tightening bolts 7, 7 and the round piece 5 are biting into each other and cannot be loosened smoothly. It can be said that it is left behind.

The present invention solves the various drawbacks of conventional tool holders as described above, and provides a tool clamp that always provides stable tightening force on the tool, has good balance, and allows extremely smooth tightening and loosening operations. The purpose is to realize a device, and in order to achieve the above purpose, a stepped inclined clamp hole with a threaded part on one inner end is provided through the tool holder, and one end of the piece forms a horseshoe shape in cross section. And, it is an object of the present invention to provide a tool clamping device characterized in that a stepped bolt inserted into the piece is screwed into the stepped inclined clamp hole to clamp the tool tool located at the lower part of the piece.

Embodiments of the present invention will be described below based on the drawings.
FIG. 2 is a front view showing the state in which the cutting tool is clamped, and FIG. 3 is a sectional view taken along line XX in FIG. 11
is a tool holder, which is fixed to the turret 13 with bolts 12, 12. Reference numeral 14 denotes a cutting tool, which is fitted and fixed into a cutting tool insertion hole 15 provided in the cutting tool holder 11. 15a is a tool position setting bolt.

A stepped inclined clamp hole 16 is provided through the cutting tool holder 11 located above the cutting tool 14. The stepped inclined clamp hole 16 has a substantially circular front face and a hole 16a with a smaller diameter than the middle part, and a female thread 16b is carved at the tip, so that a bolt tip described later can be screwed into the hole 16a. It is structured as follows.
A piece 17 having a horseshoe-shaped cross section at one end and a stepped bolt 18 inserted into the piece 17 are inserted into the stepped inclined clamp hole 16, and a male screw 18a carved at the tip of the stepped bolt 18 is inserted into the stepped inclined clamp hole 16. It is screwed into a female screw 16b provided at the tip of the stepped inclined clamp hole 16. FIG. 4 is a perspective view A and a perspective view B showing the inserted state of the stepped bolt 18 whose one end cross section forms a horseshoe shape.
They are a perspective view of the piece 17 and a perspective view of the C stepped bolt 18. As shown in D, the stepped bolt 18 is also provided with a hexagonal hole 18b on the side of the male screw 18a at the tip thereof, so that the hexagonal hole 18b can be rotated with a wrench or the like.

The lower side of the horseshoe-shaped part of the piece 17 is divided into two parts 17a and 17b as contact parts,
By each contacting and pressing the cutting tool 14, the same effect as when clamped at two locations occurs. In that case, it is a matter of course that the tightening forces of 17a and 17b are equal.

When using the tool clamp device according to the present invention, first set the tool tool 14 and adjust its position, then insert the stepped bolt 18 into the piece 17 into the stepped inclined clamp hole 16,
The male thread 18a at the tip of the stepped bolt 18 is screwed together with the female thread 16b in the stepped inclined clamp hole 16 and fixed. When the stepped bolt 18 is further rotated to continue tightening, the component force generated by the inclination of the stepped inclined clamp hole is transmitted to the cutting tool 14 via the piece 17, and the cutting tool acts as a downward pressing force on the piece 17. It functions to tighten and fix 14. At this time, the piece 17 is formed into two separate pieces with a horseshoe-shaped cross section at the part that contacts the bite 14.
As mentioned above, the component force caused by the inclination causes the piece 17 to
The cutting tool 14 is pressed by being equally divided into two contact portions 17a and 17b on the lower side. Yotsute part-time job 1
4 is supported at two points by equal component forces, and can be maintained in an extremely well-balanced clamped state. Furthermore, from an operational point of view, there is an advantage in that the conventional device uses two round pieces and does not require complicated operations such as tightening and fixing them separately.

Furthermore, when carrying out the present invention, when loosening the stepped bolt 18 in order to replace a tool that has been firmly clamped, the hexagonal hole provided at the tip of the stepped bolt 18 in the opposite direction to that when tightening is performed. By inserting a wrench into the part 18b, the stepped bolt can be rotated in the direction of loosening it, thereby providing a rotational force that could not be obtained by rotating and tightening from one side as in the past. Extremely good operability can be demonstrated not only during clamping but also during replacement.

As described in detail above, the tool clamping device according to the present invention has a simple configuration and simple operation, provides well-balanced and stable clamping performance of the tool, and is extremely effective in tightening and loosening the stepped bolt when replacing the tool. It provides a mechanism that can be tightened smoothly, and when the tool bit is long, by using multiple devices of the present invention, the setup operation time is shortened and the same tightening effect as the conventional one can be obtained. Used in machine tool turrets to great effect.

[Brief explanation of the drawing]

1 is a front view and a sectional view on the side showing a conventional bite clamp device, FIG. 2 is a front view showing an embodiment of the present invention, FIG. 3 is a sectional view taken along line XX in FIG. Figures A, B, C, and D are perspective views showing the state in which the piece and the stepped bolt are inserted. 11...Bite holder, 12...Bolt, 13...
Turret, 14...Bite, 15...Bite insertion hole,
16...Stepped inclined clamp hole, 17...Piece, 18
...stepped bolt.

Claims (1)

[Claims] 1. In a device for clamping a cutting tool, a stepped inclined clamp hole is provided in the tool holder in a direction perpendicular to the long axis of the tool and has a threaded portion at one end, and a plurality of holes each having a horseshoe shape at one end. A piece having a contact portion and formed to be inserted into the stepped inclined clamp hole, and a tightening piece that is inserted into the piece and has a front end surface and a rear end surface that are compatible with a tightening tool such as a wrench or screwdriver. A tool clamping device comprising a stepped bolt having a hole for the tool, and by tightening the stepped bolt, the tool is clamped by a plurality of contact portions formed in a horseshoe shape of the piece.