JPS6325047Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cutting tool, and in particular, allows the cutting head to be replaced quickly, making it applicable to large and medium-sized turning tools.

Conventionally, as this type of cutting tool, for example,
There is one disclosed in Publication No. 55-54104. Although this cutting tool is certainly excellent in terms of rapid replacement, it is not necessarily satisfactory in terms of chip intrusion and mounting rigidity.

For these reasons, there is a demand for the development of a cutting tool that has improved chip intrusion and mounting rigidity, and that can be replaced quickly.

The present invention was developed in view of the above points, and the locking head of the traction shaft, which is inserted into the through hole, contacts the cut surface of the protruding step provided at the tip of the holder. A cutting head with a receiving hole drilled in the lower surface is placed from above, and as the traction shaft moves, the cutting head quickly moves. The present invention provides an improved cutting tool that is replaceable.

An embodiment of the cutting tool of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a rod-shaped holder with a rectangular cross section, which is provided with a through hole 3 in the axial direction into which the traction shaft 2 is inserted, and has a protruding stepped portion at its tip. 4 is composed.

The traction shaft 2 is provided at one end with a locking head 6 having a cut surface 5, and at the other end with a threaded portion 8 which is screwed into a draw nut 7. The cut surface 5 of the traction shaft 2 is in surface contact with the upper surface 10 of the pedestal 9, thereby providing a rotation-stopping effect. In this case, the pedestal 9 is made of a T-shaped block, as clearly shown in FIGS. 4 and 5, and is fixed with a mounting screw 12 within a mounting groove 11 formed at the center of the tip of the holder 1. be done.

Therefore, the protruding step portion 4 is formed in the mounting groove 11.
It is constituted by the convex portion 13 remaining from the base 9 and the pedestal 9.

A cutting head 15 having a cutting blade tip 14 is placed from above the protruding step portion 4 .
In this case, the cutting head 15 has a U-shaped receiving hole 16 bored in its lower surface.
6 contributes to the attachment/detachment action as the locking head 6 moves in the axial direction.

In addition, the holder 1, the pedestal 9 and the cutting head 1
No. 5 has a simple structure for its contact surface, so it can be processed with high accuracy and the assembly accuracy can be improved.

Further, when mounting the cutting head 15, since the cutting head 15 is seated on the convex portions 13, 13 of the holder 1, the mounting rigidity can be increased.

Further, since the receiving hole 16 is formed from the lower surface of the cutting head 15 and placed on the protruding step portion 4, it is possible to prevent chips from entering.

As explained above, the present invention is constructed such that the attachment/detachment structure of the cutting head can be rationally performed using a traction shaft and a retraction nut, and the cutting head is provided with a protruding stepped portion provided at the tip of the holder. Since it is placed from above and can be sat on, the mounting rigidity is increased and the intrusion of chips is prevented. Therefore,
It has the advantage that it can be used in large- and medium-sized turning lathes, large-sized boring machines, etc., and can improve the operating rate.

[Brief explanation of drawings]

Fig. 1 is a cutaway front view showing an embodiment of the cutting tool of the present invention, Fig. 2 is a plan view with the main parts cut away, and Fig. 3 is a perspective view showing the configuration of the cutting head. , FIG. 4 is a partial perspective view showing the tip portion of the holder, and FIG. 5 is a partially exploded perspective view showing the tip portion of the holder. DESCRIPTION OF SYMBOLS 1... Holder, 2... Traction shaft, 3... Through hole, 4... Convex step, 5... Cutting surface, 6... Locking head, 9... Pedestal, 15... Cutting head, 16...
...Reception hole.

Claims (1)

[Claims for Utility Model Registration] On the protruding stepped portion 4 provided at the tip of the holder 1, the locking head 6 of the traction shaft 2 inserted into the through hole 3 has a cut surface 5. A cutting head 15 having a U-shaped receiving hole 16 drilled in the lower surface is placed on the cutting head 15 from above. This is a cutting tool in which the cutting head 15 can be quickly exchanged, and the protruding step portion 4 has a pedestal 9 made of a T-block in a mounting groove 11 formed in the central portion, which is screwed from the axial direction. A cutting tool characterized in that the upper surface 10 is in contact with the cutting surface 5 of the locking head 6 to make the traction shaft 2 a non-rotating body.