Clamping structure for throwaway chip

Abstract

To ensure chip strength by preventing a chip main body from being largely chipped by a mounting hole of the chip main body without making the shapes of a clamping member head part and the mounting hole complicated. [MEANS FOR SOLVING PROBLEMS] On the chip, a mounting hole (5) penetrating a chip main body (1) is formed. The chip is pressed with the clamping member (13) provided with a shaft part (13A) inserted into the mounting hole (5) and a head part (13B) having a diameter larger than that of the shaft part (13A), and the chip is clamped to a chip mount (12) by a chip clamping mechanism. In the clamping member (13), a cross section orthogonally intersecting a central shaft line (O) of a rear plane (13C) of the head part (13B) has a circular shape with the shaft line (O) at the center. In the chip main body (1), the head part (13B) of the clamping member (13) is permitted to pass through the mounting hole (5). An opening part of the mounting hole (5) is provided with an abutting part (5B) whereupon a part of the rear plane (13C) of the head part (13B) abuts when the clamp member (13) moves forward.

Description

technical field [0001] The present invention relates to a clamping mechanism of a blade. A non-regrinding blade (hereinafter referred to as the blade) provided with a mounting hole through the blade body is freely mounted on a blade mounting seat formed on the tool body by a clamping member. In particular, it relates to a clamping mechanism for a blade that can be attached to and detached from the blade without completely detaching the clamp member from the tool body. Background technique [0002] As such a clamping mechanism, it is common to set the outer diameter of the shaft portion of the clamping member to be smaller than the inner diameter of the mounting hole formed in the blade body, and make the head portion provided at one end of the shaft portion The outer diameter is made larger, and at the same time, a screw portion screwed into the blade mounting seat of the tool body is formed at the other end of the shaft portion. After the blade body is mounted on the blade ...

AI Technical Summary

Problems solved by technology

[0009] However, as in Patent Documents 1 to 3, a clamping mechanism in which a protrusion is formed on the head of the clamping member and a concave-convex portion is formed in the mounting hole of the blade body is used. The shape of the head of the clamping member or the mounting hole of the blade body It will be complicated, and if the convex part of the mounting hole when installing the blade or the concave part when removing the blade does not match the rotation position of the above-mentioned protrusion, the blade cannot be attached or removed.

Therefore, using a simple clamping member such as a clamping screw provided with a screw portion only on the opposite side of the head portion of the shaft, especially when the blade is mounted, the clamping member advances toward the blade mounting seat side while rotating its entire circumference, It is difficult to match the protruding part and the convex part, making it impossible to apply, and the structure that makes the clamping member go in and out when attaching and detaching the blade is also complicated, resulting in high cost.

[0010] On the other hand, with the clamping mechanism described in Patent Document 4, in the mounting hole of the blade body, a large-diameter passing hole portion adjacent to the head portion of the clamping member can pass through, and a shaft portion communicating with each other is also formed. The hole for clamping that passes through, in order to form such a mounting hole, the notch of the blade body will become larger and the strength of the blade will be reduced, and the blade body may be damaged in some cases.

And, with the clamping mechanism described in this patent document 4, as mentioned above, the head of the clamping member passes through the blade body with the hole portion by sliding, and is positioned in contact with the wall surface of the blade mounting seat, and at the same time, the shaft portion After passing through and being arranged in the clamping hole, the clamping member is screwed in to clamp the blade. Therefore, in the direction opposite to the sliding direction of the blade body, that is, in the direction opposite to the wall surface of the blade mounting seat, the blade body is only The state is maintained based on the friction of the pressing force of the head of the clamping member. Therefore, when a large force is applied in this direction during cutting, the misalignment of the insert is likely to occur.

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