JP2557676Y2 - Slow way tip clamping mechanism - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a clamp mechanism of a throw-away tip for fixing a throw-away tip to a tool holder, and particularly to a mechanism capable of temporarily clamping a tip to a tool holder. .

[Prior Art] In a cutting tool for performing a cutting operation by fixing a throw-away tip to a tip portion of a tool holder, a throw-away tip (hereinafter, abbreviated as a tip) is pressed against the tool holder by a clamp piece. An apparatus using a clamp mechanism of a fixed type is known.

FIG. 4 shows a conventional cutting tool using this type of clamping mechanism, in which a tip mounting seat is provided at a tip corner of a tool holder 1 formed of steel or the like. The chip 2 is mounted on the chip mounting seat with its bottom surface and side surfaces abutting against the chip mounting seat bottom surface 1a and the chip mounting seat side surface 1b. A locking portion 3 protruding from the upper surface of the tool holder 1 is formed on the base end side of the tip mounting seat, and a substantially V-shaped locking is formed by the side surface of the locking portion 3 and the upper surface of the tool holder 1. A groove 4 is formed. A screw hole 5 is formed substantially at the center between the tip mounting seat on the tool holder 1 and the locking portion 3, and the diameter of the screw hole 5 on the upper side is larger than the diameter on the lower side. As a result, a tool holder step 5a is formed. A substantially L-shaped clamp piece 6 is placed above the screw hole 5.

The tip of the long side of the clamp piece 6 is formed with a chip pressing surface 6a which is in contact with the upper surface 2a of the chip 2 placed on the chip mounting seat. A substantially semi-cylindrical projection 6b which is in contact with the locking groove 4 of the tool holder 1 is formed. A substantially central portion of the clamp piece 6 is provided with a through hole 7 facing the screw hole 5 of the tool holder 1 and having a diameter larger than the diameter of the screw hole 5. The through-hole 7 has a lower portion having a larger diameter than the upper portion, thereby forming a clamp piece step 7a.
The clamp piece step 7a and the tool holder step 5a
, A compressed spring 8 is interposed.

The clamp piece 6 is inserted into the through hole 7 and attached to the tool holder 1 by a clamp bolt 9 screwed into the screw hole 5 of the tool holder 1.

In the above-mentioned conventional clamping mechanism, when the tip 2 is not placed on the tip mounting seat of the tool holder 1, the clamp piece 6 is moved by the spring 8 interposed between the clamp piece 6 and the tool holder 1. 6 is pushed upward with the projection 6b as a fulcrum. As a result, the tip pressing surface 6a at the tip of the clamp piece 6 is held above the position of the upper surface 2a of the chip 2 to be placed, so that the chip 2 can be easily mounted on the chip mounting seat. Then, after placing the chip 2 on the chip mounting seat, if the clamp bolt 9 is further tightened, the chip pressing surface 2a of the clamp piece 2 moves toward the chip mounting seat bottom surface 3a, whereby the chip 1 is mounted. Pressed and fixed to the seat.

[Problem to be Solved by the Invention] By the way, the tool holder 1 to which the tip 1 is fixed as described above is turned upside down as shown in FIG. (Abbreviated as a state.) It may be attached to a chip attachment seat. In order to attach the chip 2 to the chip mounting seat of the tool holder 1 in such a state, the operator causes the chip 2 to abut on the chip mounting seat bottom surface 1a and the chip mounting seat side surface 1b, and furthermore, the chip pressing surface 6a
In this state, the clamp piece bolt 9 must be tightened and fixed to the chip mounting seat in a state where the chip piece 2 is in contact with the upper surface 2a of the chip 2, so that workability for fixing the chip 2 is extremely poor.

In Japanese Utility Model Publication No. 43-32072, a spring washer is provided between a clamp piece and a clamp bolt. However, in this case, when the throw-away tip is clamped, the clamp bolt is attached to the spring washer. In order to obtain a strong clamping force, not only a long coil such as a coil spring cannot be used, but also a problem that the spring washer is damaged by the clamp. Furthermore, the head of the clamp bolt projects greatly by sandwiching the spring washer, which hinders the discharge of cutting waste. In addition, the spring washer used has a small amount of expansion and contraction, so that the movement stroke of the clamp piece based on the urging force cannot be increased. Met.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the problems of the clamp mechanism when a chip is mounted on a chip mounting seat in an inverted bite state.

[Means for Solving the Problems] According to the tip clamping mechanism of the present invention, the throw-away tip is placed on the tip mounting seat formed at the tip of the tool holder, and the clamp piece and the through hole of the clamp piece are provided. In the clamp mechanism of a throw-away tip pressed and fixed by a clamp bolt passed through, a diameter of a portion of the through hole opposite to the tip mounting seat is formed to form a clamp piece step in the through hole, Between the head of the clamp bolt and the step of the clamp piece, the clamp piece is pressed toward the bottom surface of the tip mounting seat, and when the indexable tip is pressed and fixed, the through-hole is enlarged. It is characterized in that a stored elastic body is interposed.

[Operation] According to the tip clamping mechanism of the present invention, when the tip is fixed to the tip mounting seat in the reverse bite state, the tip is dropped by the urging force of the spring interposed between the clamp bolt and the clamp piece. Since the temporary clamping can be easily performed between the clamp piece and the tool holder without any trouble, the operation of fixing the chip in the inverted bite state can be facilitated. Further, when the chip is clamped, the spring is housed in the through hole of the clamp piece, and the clamp bolt directly presses the clamp piece, so that a strong clamping force is obtained and the spring is not damaged by the clamp. In addition, the head of the clamp bolt does not protrude so much that it does not interfere with the discharge of cutting waste. In addition, since the movement stroke of the clamp piece can be increased by using a spring having a long overall length, the chip can be provisionally clamped widely when the clamp bolt is loosened.

[Embodiment] Fig. 1 shows an embodiment of the tip clamping mechanism of the present invention. The same components as those shown in Fig. 3 are denoted by the same reference numerals, and the description thereof will be omitted.

In the tip clamping mechanism of the present invention, the compressed spring 8 is not interposed between the clamp piece 6 and the tool holder 1, and the clamp bolt 9 and the clamp piece 6 are not interposed.
It is interposed between and. That is, a clamp piece stepped portion 7e is formed in which the diameter of the upper side of the through hole 7 of the clamp piece 6 (part away from the tool holder 1) is larger than the diameter of the lower side, and the compressed spring 8 But the clamp piece step
7e and the lower end 9a of the head of the clamp bolt 9 is interposed.

In the tip clamping mechanism having the above configuration,
When the chip 2 is not attached to the tool holder 1, the chip pressing surface 2 a of the clamp piece 2 is moved from the upper surface position of the mounted chip 1 by the spring 8 interposed in the clamp piece 6. In addition, the bottom of the chip mounting seat
It is pressed to the position on the 3b side.

In order to mount the chip 1 with the tool holder 3 in the inverted bite state, first, as shown in FIG.
The tip pressing surface 6a of the clamp piece 6 is pushed down, and the tip 2 is inserted between the tip mounting seat bottom surface 1a and the clamp piece 6. Then, the bottom surface and the side surface of the chip 2 are brought into contact with the chip mounting seat bottom surface 1a and the chip mounting seat side surface 1b. At this time, since the pressing surface 6a of the clamp piece 6 always presses the chip 2 toward the chip mounting seat bottom surface 1a by the urging force of the spring 8, the chip 1 does not fall off from the position of the chip mounting seat. Is temporarily fixed.

Then, the tip 2 is pressed and fixed to the tip mounting seat by tightening the clamp bolt 9 into the tool holder 1 from that state.

In this way, the tip 2
Is fixed, the chip 2 is easily temporarily clamped between the clamp piece 6 and the tool holder 1 without dropping the chip 2 by the urging force of the spring 8 interposed between the clamp bolt 9 and the clamp piece 6. Therefore, the operation of fixing the chip 2 in the reverse byte state can be facilitated. At this time, the lower end of the head of the clamp bolt 9
9a is in direct contact with the clamp piece 6, and the spring 8 is housed in the through hole 7.

As shown in FIG. 3, in addition to the above configuration,
If step portions 5a and 7a for interposing a spring 8 between the clamp piece 6 and the tool holder 1 are formed in advance in the same manner as in the prior art, the spring 8 is moved in accordance with the mounting direction of the chip 2. 6 and the tool holder 1 or between the clamp bolt 9 and the clamp piece 6. In addition to the above-mentioned effects, the operability of the tip 2 in a normal state in the related art can be achieved. Can be improved.

[Effects of the Invention] As described above, according to the clamp mechanism of the present invention, when the chip is fixed to the chip mounting seat in the reverse bite state, when the chip is mounted on the chip mounting seat, the clamp bolt and the clamp piece are fixed. The tip of the clamp piece presses the upper surface of the chip in the direction of the bottom surface of the chip mounting seat due to the urging force of the elastic body interposed between the clamp piece and the tool holder without dropping the chip. Since the temporary clamping can be easily performed, the operability of the operation of fixing the chip in the inverted bite state can be improved. Furthermore, when clamping the chip, the spring is stored in the through hole of the clamp piece, and the clamp bolt directly presses the clamp piece, so that the chip can be strongly clamped and the spring should not be damaged by the clamp. Can be. In addition, since the head of the clamp bolt does not protrude significantly, it can be prevented from obstructing the discharge of cutting waste. In addition, since a spring having a long overall length can be used, the movement stroke of the clamp piece can be increased, whereby the tip can be provisionally clamped widely when the clamp bolt is loosened, and the usability can be improved.

[Brief description of the drawings]

1 to 3 show an embodiment of the clamping mechanism of the present invention. FIG. 1 is a sectional view, FIG. 2 is a sectional view showing a temporary clamping of a chip in an inverted cutting tool state, and FIG. Fig. 4 is a sectional view showing another embodiment, Figs. 4 and 5 show an embodiment of a conventional clamping mechanism, Fig. 4 is a sectional view, and Fig. 5 is a temporary clamping of a chip in an inverted cutting tool state. FIG. DESCRIPTION OF SYMBOLS 1 ... Tool holder, 1a ... Tip mounting seat bottom face 1b ... Tip mounting seat side face 2 ... Tip (throw-away tip), 5 ... Screw hole, 6 ... Clamping piece 6a ... Tip pressing face, 7 ...... Through-hole 8 ... elastic body (spring), 9 ... clamp bolt.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroaki Hayashizaki 1-27-20 Nishishinagawa, Shinagawa-ku, Tokyo Mitsui Kinzoku Co., Ltd. Tokyo Works (56) References Japanese Utility Model Showa 53-61891 (JP, U) Jikken Sho 43-32072 (JP, Y1)

Claims (1)

(57) [Scope of request for utility model registration] 1. A throw-away tip clamping mechanism in which a throw-away tip is placed on a tip mounting seat formed at a tip portion of a tool holder, and is pressed and fixed by a clamp piece and a clamp bolt passing through a through hole of the clamp piece. In the above, the diameter of the portion of the through hole opposite to the chip mounting seat is increased to form a clamp piece step in the through hole,
The clamp piece is pressed between the head of the clamp bolt and the step portion of the clamp piece toward the bottom surface of the tip mounting seat, and the diameter of the through-hole is increased when the throw-away tip is pressed and fixed. A clamp structure for a throw-away tip, characterized by interposing an elastic body accommodated in the insert.