JPS5821601Y2 - clamp bite - Google Patents

Description

[Detailed explanation of the invention] This invention is a disposable tip with a hole (usually called a throw-away tip, hereinafter abbreviated as a throw-away tip).
This relates to the tightening structure.

A clamp tool for clamping and fixing an indexable tip with a hole to a chip seat having a recessed side wall provided at the tip of a tool holder is already known from Japanese Patent Laid-Open No. 47-40379.

The publication states that a compression spring is pressed from the side against a suppression shaft that is pulled by a connector through a screw, and a strip ring that fixes the chip shim is also restrained from rapid movement, thereby securing the chip securely. Let it rest,
A method is described in which the chip is pressed against the side wall by pulling the connector with the conical part of the towing bolt and tilting the suppression shaft.

However, in this method, since there is little contact between the conical portion of the traction bolt and the connector, there is a tendency for the tightening portion to loosen due to resistance or impact during cutting.

This invention aims to improve these defects,
To explain in detail with reference to the embodiments of the drawings, in FIGS. 1 and 2, the indexable tip 1 has a hole 2 in the center and is fixed to the tip seat 6 via a pad 22.

The tip seat 6 is formed as a recess at the tip of the tool holder 7, and in this embodiment, the two rear side surfaces of the square tip 1 are in contact with the side walls 29 of the tool holder 7.

The chip seat 6 has a rectangular groove 9 extending from its central portion to the rear shank, and includes a plate-shaped portion 10 fitted into the groove 9 and a hook-shaped rising portion 11 at its rear end. The connector 4 is provided with a through hole 20 that communicates with the through hole 2 together with the through hole 23 of the security deposit 22, and behind the through hole 20 and adjacent to the rising portion 11, a second It has a through hole 21 and communicates with a through hole 24 penetrating the cutting tool holder 7.

The side of the rising portion 11 facing the second through hole 21 is formed into a slope 12 forming an obtuse angle with the plate-shaped portion 10, and the back surface thereof is bent at a right angle to form a cavity 18 between it and the shank portion. Built-in Shibane 19.

The shaft body 3 is inserted through the through hole 2 of the tip 1, the through hole 23 of the pad 22, the through hole 20 of the connector 4, and the through hole 24 provided through the tool holder 7. A nut 34 having a spherical bottom surface 27 and a lock nut 26 are screwed to the end of the shaft body 3 to open the through hole 2 of the pad 22.
The pad 22, the connector 4, and the tool holder 7 are joined together by pressing together with the collar 28 of the shaft body 3 in the shaft body 3.

On the other hand, the lower threaded part of the traction bolt 5, which has opposite threaded parts at both ends, is screwed into the tool holder 7 through the second through hole 21 of the connector 4, and the upper threaded part has the inclined surface 12. A wedge-shaped nut 3 with a surface that conforms to the slope of
Screw on 1.

In the embodiments shown in FIGS. 4 and 5, the shaft body 3 is integrally erected near the tip of the plate-like portion 10 of the connector 4, and connects the pad 22 and the chip 1 to form a convex arc shape of the chip hole 2. It faces the surface 33 of.

17 and 17 serve as guides for the wedge-shaped nut 31.

The crank bit of the present invention has the above-mentioned configuration, and when the traction bolt 5, which has oppositely threaded portions at both ends, is rotated clockwise, the wedge-shaped nut 31 descends along the slope 12 of the connector. The connector 4 is forced toward the shank B side under the resistance of the compression spring 19, and the front circumferential surface 32 of the through hole 20 of the connector is threaded in opposite directions at both ends of the shaft body 3. By pressing in the direction of the traction bolt 5 and tilting the shaft 3, the tip 1 is pressed against the side wall 29 of the cutting tool holder 7 by its head 30 as shown in FIG. 1 and fixed.

In this state, there are many contact areas between the connector 4 and the wedge-shaped nut 31 due to the slope, so the tightening part does not loosen due to resistance or impact during cutting, and the shaft body does not move due to the impact action of the compression spring when tightening. It is possible to always perform reliable tightening without causing any impact.

In addition, since a compression spring is applied to the back of the rising part of the connector, the empty space for accommodating the spring is given an upper position relative to the tool holder, and a hole is drilled deep inside the tool holder to accommodate the spring. Because I have nothing to do,
It does not reduce the rigidity of the tool holder, making it easy to replace the tip, and also fixes the tip while suppressing sudden traction force from being applied to the shaft due to the resistance of the compression spring when tightening the double screw. , which provides a reliable tightening effect.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the main parts showing the solid state of the tip of the clamp tool of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a perspective view of all parts disassembled according to their assembly positions, Fig. 4
FIG. 5 is a longitudinal sectional view of a main part of another embodiment. 1... Chip, 2... Chip hole, 3.
...Shaft, 4...Connector, 5...
...Tow bolt, 6...Chip seat, 7...
...Bite holder, 8...Shank, 9.
...Rectangular groove, 10 ...Plate-shaped part, 11
... Rising part, 12 ... Slope, 13
...Back, 19...Spring, 20...
... Connector through hole, 24 ... Bit holder through hole, 25 ... Opening, 26 ... Nut.

Claims (1)

[Scope of utility model registration request] In a clamp tool, a shaft body 3 fitted into a hole 2 of an indexable tip 1 with a hole is pressed by a traction bolt 5 through a connector 4 to fix the tip 1 to a predetermined tip seat 6. is the chip seat 6
A rectangular groove 9 extending in the direction of the shank 8 is formed in the connector 4, and the connector 4 has a plate-shaped portion 10 that slides within the rectangular groove 9, and a raised portion connected to one end in the shape of a hook. 11, the rising portion 11 has a side surface facing the tip 1 forming an obtuse slope 12, and a back surface 13 that stands upright has a built-in spring 19 between it and the shank 8 and is close to the slope 12. The traction bolt 5, whose both ends form a double thread, is inserted into the cutting tool holder 7 through the plate-shaped portion 10, and the slope 12 is attached to the threaded portion of the upper part of the traction bolt 5.
A clamp bit formed by engaging a wedge-shaped nut 31 suitable for.