JP2585863Y2 - Holder for indexable insert - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a holder for a throwaway tip for holding a throwaway tip for cutting metal or the like.

[0002]

2. Description of the Related Art The following two types of clamp mechanisms for a throw-away tip have been conventionally used. The first one is a so-called lever lock type mechanism shown in FIG. 8, which is an L-shaped lever (hereinafter abbreviated as “lever”) 24 and a throw-away tip (hereinafter “tip”) through a lock screw 26. 21) is performed. The lever 24 is provided in a lever hole 25a formed in the tip of a holder for a throwaway tip (hereinafter abbreviated as a holder) 25, in a through hole 23a of the sheet 23, in a through hole 21a of the tip 21, and The rocker 26 swings around a lever fulcrum 24b in a lock screw hole 25b into which the lock screw 26 is screwed at the back. Lever 24
The tapered portion 24a at one end of the lock screw hole 25b is provided at the upper part of the holder 25 and penetrates the lever hole 25a.
The lever 24 swings about the lever fulcrum 24b by raising and lowering the lock screw, and the tip 21 is penetrated by the clamp portion 24c at the upper end. Hole 21a
Is clamped by pressing the inner wall. The lock screw 26 is inserted into a hexagonal hole 26a in the head and rotated by inserting a hexagonal wrench (not shown) into a lock screw hole 25b formed by drilling a lower end bolt portion 26c from the upper surface of the holder 25. It is screwed. The lock screw 26 can be moved up and down by inserting a hexagonal wrench (not shown) into the hexagonal hole 26a and rotating it.
The sheet 23 is used to secure flatness with respect to the bottom surface of the chip 21 and to protect the holder 25 when the chip 21 is lost. In addition, the shim pin 22 has a through hole
In the through hole 23a of the sheet 23 in the space 21a, the lever 24 is accommodated in a space on the rear side of the lever 24, that is, on the tip side of the holder 25.
Of the holder 25 swings toward the tip of the holder 25,
The rear back of the lever 24 has the shim pins 22
By pressing against the inner wall of 23a, the head 22a of the shim pin 22 simultaneously presses the sheet 23 from above and fixes it so as not to come off the holder 25.

On the other hand, the second type is called a wedge clamp system, and as shown in FIG.
The inner wall of the through hole 31a of the chip 31 presses the shim pin 32 by pressing the chip 31 from above against the chip 31 by the clamp piece 352 and pressing the holder 34 toward the distal end, thereby fixing the chip 31. is there. The shim pin 32 passes through a through hole 33a of the sheet 33 and a shim pin hole 34a formed at the tip of the holder 34, and a lower end bolt portion is received by a nut 36 in a nut hole 34d formed in the holder 34. At this time, the circumferential projection 32 of the shim pin 32
The sheet 33 is attached to the holder 34 by pressing from above
Is fixed, and the chip 31 is inserted thereon.

[0006] The clamp set 35 is composed of a clamp piece 352 and a clamp bolt 351. The clamp piece 352 includes a clamp bolt hole 352b through which the clamp bolt 351 passes, and a tapered inclined portion 352a at the rear.
Is provided. On the other hand, the clamp bolt 351 is a clamp bolt hole formed in the holder 34 by inserting a hexagon wrench into the hexagon hole 351a and rotating it.
It is screwed into 34b and its head pushes down clamp piece 352. At this time, the inclined portion 352 a of the clamp piece 352 a
Slides on the contact angle portion 34c on the upper surface of the holder 34, whereby the clamp piece 352 moves toward the tip of the holder 34, and the inner wall of the through hole 31a of the chip 31 presses the shim pin 32 toward the tip of the holder 34. As a result, the chip 31 is clamped.

[0005]

2. Description of the Prior Art Among the above conventional examples, the lever lock method cannot avoid the following disadvantages due to its structure. That is, when clamping the chip 21, the clamping portion 24 of the lever 24
It is necessary to rotate the lock screw 26 several times so that c becomes a predetermined position. When unclamping, it is necessary to perform the reverse operation of clamping. For attaching and detaching this chip 21
Since a time of 15 seconds or more is required, processing must be stopped during that time, which is one of the causes of a reduction in processing efficiency in a mass production processing line or the like.

Since the force for turning the lock screw 26 varies from person to person, the tightening of the tip 21 is not constant, and as a result, there is a difference in the clamping force between the operators.

[0007] Since the tightening force is not constant, the torque is usually over torque. As a result, the hexagonal hole 26a of the lock screw 26 and the hexagonal wrench (not shown) are deformed, and the tip 21 cannot be easily removed. In this case, it is necessary to remove the boulder body 25 from the machine and replace the parts.

On the other hand, the wedge clamp system also has the following disadvantages: the clamp of the tip 31 is a clamp piece of the clamp set 35
The through hole 31a of the chip 31 due to the forward movement of 352
When the tip 31 is replaced, the clamp bolt 351 must be rotated when the tip 31 is replaced because the inner wall of the tip 31 presses the shim pin 32 and the tip 31 is pressed from above by the downward movement. Therefore, it is necessary to move the clamp piece 352 at least by the thickness of the chip 31. This takes about 5 revolutions or more, which takes 15 to 20 seconds.

Since the tightening force of the clamp bolt 351 is not fixed by the operator, it tends to be overtorque.

[0010]

In order to solve the above-mentioned problems, the present invention provides a method of clamping and unlocking a throw-away tip at the upper end of an L-shaped lever by the forward and backward movement of a cylinder pin combined with one end of the lever. A clamp mechanism is provided, and an elastic body is interposed around the cylinder pin so that the cylinder pin presses the lever with the elastic body. The inner wall of the through-hole is pressed to clamp the throw-away tip, and the tip is provided so that the push pin combined with the cylinder pin by taper joining is pushed in the direction of the cylinder pin, and the cylinder is pushed by pushing the push pin. The pin is configured to move backward, releasing the clamp part of the lever from the inner wall of the through-hole of the throw-away tip There is provided a throw-away tip holder which is adapted to unclamp Te.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention. 1 to 7, reference numeral 1 denotes a throw-away chip (hereinafter abbreviated as a chip) having a through hole 1a at its center, 2 a sheet having a through hole 2a at its center, and 3 a sheet provided at the through holes 1a and 2b. Shim pin to be inserted, 4 is L
L-shaped lever (hereinafter abbreviated as lever), 5 is a holder for a throw-away tip (hereinafter abbreviated as holder).

As shown in FIG. 3, the chip 1 is placed on the upper surface of the seat 2 seated on the chip mounting surface 5a of the holder 5. The lever 4 is provided in a cylinder pin hole 5b formed from the rear end face of the holder 5 toward the front end, in a lever hole 5c communicating with the syringe pin hole 5b, and in a through hole 1a between the chip 1 and the sheet 2. In 2a, its fulcrum 4
It swings around a. The shim pins 3 are located in the through holes 1a and 2a of the chip 1 and the sheet 2, and are located on the rear rear side of the lever 4.

The sheet 2 is mounted to secure flatness with respect to the bottom surface of the chip 1 and to protect the holder 5 when the chip 1 is lost.

The tapered portion 4c at one end of the lever 4 is shown in FIG.
As shown in the figure, in the cylinder pin hole 5b, the cylinder pin 8 is combined with a tip 8b having a tip slope 8a. The lever 4 swings about the lever fulcrum 4a by the forward and backward movement of the cylinder pin 8, and the inner wall of the through hole 1a of the chip 1 is pressed and clamped by the clamp portion 4b at the upper end.

As shown in FIGS. 1 and 2, the cylinder pin 8 has a large-diameter portion 8c having a large-diameter columnar shape as a whole behind the tip 8b, and a small-diameter rod-shaped portion behind the large-diameter portion 8c. 8d. As shown in FIG. 2, this rod-shaped portion 8d is located in the cylinder pin hole 5b, around which an elastic body 6 combined with a Sarah spring is mounted, and its rear end is inserted into a through-hole 9a of a cylindrical sleeve 9. It is. Further, the cylinder pin hole 5b is formed with an internal thread near the rear end face of the cylinder pin hole 5b.
Bolt 10 is screwed.

A vertically long groove 8f is formed in the upper part of the large diameter portion 8c of the syringe pin 8, and as shown in FIG.
The upper part 7 is inserted into a through hole 5g formed from the upper surface of the holder 5.
The lower portion 7b of the anti-rotation bolt 7 to which a is screwed is positioned in the groove 8f while allowing the cylinder pin 8 to move back and forth, thereby preventing the rotation of the cylinder pin 8.

As shown in FIG. 2, the elastic body 6 is compressed in a space defined by the large diameter portion 8c of the cylinder pin 8 and the other end by the cylindrical sleeve 9 in the cylinder pin hole 5b. Therefore, the cylinder pin 8 is always pressed forward. As a result, as shown in FIG. 3, the tapered portion 4c of one end of the lever 4 and the tapered end surface 8a of the cylinder pin 8 are joined together at the tapered end 4c of the lever 4 so that the tapered portion 4c of the lever 4 is pushed down. The clamp portion 4b swings about the lever fulcrum 4a in the direction of pressing the inner wall of the through hole 1a of the chip 1 to clamp the chip 1. As shown in FIG. 2, by tightening the bolt 10, the elastic body 6 is pushed in the direction of the distal end of the holder 5 through the cylindrical sleeve 9 to be compressed, or conversely, is loosened to form the elastic body 6. Adjust the elastic force, that is, the clamping force of the tip.

As shown in FIG. 2, the rod portion 8d of the cylinder pin 8 to be inserted into the cylinder pin hole 5b provided in the longitudinal direction of the holder 5 has a relatively long dimension, and is therefore interposed around. The elastic body 6 can also have a long dimension, and can apply a very strong clamping force to the clamp portion 4b of the lever 4.

The elastic member 6 may be a coil spring, rubber, or the like, in addition to the spring.

1 to 7, reference numeral 11 denotes a coil spring, 12 denotes a spike-shaped push pin provided with a flange 12a in the center circumferential direction, and 13 denotes a through hole 1 at the center.
3a.

As shown in FIG. 4, the small-diameter hole 5e is
It is located between the large diameter hole 5f drilled from the side surface of the holder 5 at the more distal end and the cylinder pin hole 5b of the holder 5 and communicates with both. In the large-diameter hole 5f, the push pin 12 has a coil spring 11 having a diameter larger than that of the small-diameter hole 5e around a side of the conical tip 12b which is tapered from the flange 12a provided in the central circumferential direction. It is mounted so that the tip portion 12b comes into contact with the rear tapered surface 8g of the concave V-shaped portion 8e provided on the large diameter portion 8c of the cylinder pin 8.

The large diameter hole 5f has an internal thread near the opening, into which the bolt 13 is screwed. The bolt 13 prevents the push pin 12 having the flange 12a from dropping out of the large diameter hole 5f. A part of the rear part 12c of the push pin 12 protrudes from the through hole 13a of the bolt 13. By pushing this, the tip 12a of the push pin 12 presses the rear tapered surface 8g of the concave V-shaped portion 8e provided on the large diameter portion 8c of the cylinder pin 8 as shown in FIG. Moves backwards.

When the cylinder pin 8 moves backward, as shown in FIG. 7, the tapered portion 4c of one end of the lever 4 and the tapered portion 4c of the lever 4 at the joining surface of the inclined end surface 8a of the syringe pin 8 are tapered. Since the lever 4 swings upward, the lever 4 swings about the lever fulcrum 4a in the direction away from the inner wall of the through hole 1a of the chip 1, that is, in the direction of the tip end of the holder 5, the tip 1 is unlocked. The chip 1 can be removed from the holder 5 by clamping.

A groove 13b is formed in the one end of the bolt 13 in a diametrical direction as shown in FIG. 5, and a holder such as a screwdriver is applied to the groove 13b by rotating the bolt 13 with a screwdriver. 5 is screwed into the large-diameter hole 5f.

Next, a method for clamping the tip 1 using the indexable tip holder 5 of the present invention will be described with reference to FIGS. 2, 6 and 7. FIG.

First, as shown in FIG. 6, to clamp the chip 1, the push pin 12 is pushed in, whereby the cylinder pin 8 is moved backward. Then, as shown in FIG. 7, the tapered portion 4c of the lever 4 combined with the tip slope 8a of the cylinder pin 8 swings upward. As a result, the lever 4 is centered on the lever fulcrum 4a and the clamp portion 4b is moved to the tip of the holder 5. The chip 1 is swung so as to be swung in the direction of the section, and the chip 1 can be mounted on the seat 2. In addition, shim pin 3
Is for fixing the sheet 2 to the holder 5, and when the clamp portion 4 b of the lever 4 swings toward the front end of the holder 5, the through hole 2 of the sheet 2 is
a, and presses the sheet 2 from above by the head 3a, and the chip mounting surface 5a of the holder 5 is pressed.
Secure so that it does not come off.

Referring to FIG. 2, it is clear that the elastic member 6 housed in the cylinder pin hole 5b at this time has one end of the large diameter portion 8c of the cylinder pin 8 and the other end in the cylinder pin hole 5b. It is in a state of being strongly compressed in the space limited by the cylindrical sleeve 9.

Next, in this state, the chip 1 is
After being mounted on the upper part of the cylinder, the pressing on the push pin 12 is released, so that the elastic body 6 in the compressed state pushes the cylinder pin back in the opposite direction to that pressed by the cylinder pin 12 due to its elastic force. Thereby, the cylinder pin 8 returns to the front. As a result, FIG.
As shown in FIG. 5, the lever 4 is pushed down, and the lever 4 swings around the lever fulcrum 4a in the direction in which the clamp portion 4b presses the inner wall of the through hole 1a of the chip 1 to clamp the chip 1.

The push pin 12 is pushed by using a hydraulic piston or lever (not shown) to insert the tip 1.
Can be automatically exchanged.

As described above, the tip 1 can be clamped only by pushing the push pin 12 and with a small amount of movement. Actually, when the replacement time was measured using the holder according to the conventional example and the present invention, it was found that the replacement time of the chip 1 was reduced from about 15 seconds or more in the conventional type to about 7 seconds.

[0031]

[Effects of the Invention] The following effects can be obtained by the indexable tip holder of the invention.

The chip can be easily attached and detached by pushing and pulling the push pin.

The tip clamping force is always constant without any difference among the workers.

Since a repulsive force of an elastic body such as a spring, a coil spring, and a rubber is used, a greater clamping force can be obtained, and a firm and stable tip can be fixed.

The chip replacement time is about 7 seconds, which is less than half of the conventional example, and the machining efficiency is increased.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a throw-away tip holder of the present invention.

FIG. 2 is a cutaway side view showing the indexable tip holder of the present invention.

FIG. 3 is a cutaway side view showing the indexable tip holder according to the present invention;

FIG. 4 is a cutaway top view showing the tip of the holder for a throw-away tip of the present invention.

FIG. 5 is a side view of the indexable tip holder according to the present invention, which is located at a position distal to the tip.

FIG. 6 is a cutaway top view illustrating the tip of the indexable tip holder according to the present invention for explaining the tip clamping method.

FIG. 7 is a cutaway side view of the indexable tip holder according to the present invention for explaining the tip clamping method.

FIG. 8 shows a holder for a throw-away tip by a lever lock method in a conventional example, (A) is an exploded perspective view,
(B) is a cutaway side view.

9A and 9B show a wedge clamp type holder for a throw-away tip of a conventional example, wherein FIG. 9A is an exploded perspective view and FIG. 9B is a cutaway side view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Throw-away tip 2 Sheet 3 Shim pin 4 L-shaped lever 5 Holder for throw-away tip 6 Elastic body 8 Cylinder pin 9 Cylindrical sleeve 11 Coil spring 12 Push pin 10, 13 bolt

Claims (1)

(57) [Scope of request for utility model registration] An elastic body is interposed around a cylinder pin combined with one end of an L-shaped lever, and the cylinder pin presses the lever with the elastic body to clamp the lever. Part is a holder configured to press the inner wall of the through-hole of the throw-away tip to clamp the throw-away tip, wherein the holder is provided with a push pin whose tip is taperedly engaged with the cylinder pin, and pushes in the push pin. The holder for a throw-away tip, wherein the cylinder pin moves rearward at that time, and the clamp portion of the lever is released from the inner wall of the through-hole of the throw-away tip to be unclamped.