JPH039922Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology belongs to the technical field of the structure of cutting tools used in metal processing.

Therefore, in this invention, the tip provided at the tip of the body is detachably attached to a rotatable support shaft, and can be fixed by pressure via a locator, so that the cutting part of the tip can be used effectively. This is an invention related to the cutting tool structure, in particular,
A roller is provided on the support shaft so as to be able to come into contact with and separate from the support shaft, and is rotatable by contacting the support shaft. A linked push-pull lever allows the tip to be fixed after rotation, for example.
This idea is related to the structure of cutting tools such as bits.

<Prior art> In general, a cutting tool used for cutting metal is equipped with a chip in the part that performs cutting, but focusing on the fact that the only part that wears out is the chip, in recent years, cutting tools have been developed. Throwaway tip type bites are becoming more and more popular.

In order to easily replace the cutting edge of the chip, corner chain cutting tools of the type that rotatably support the chip are widely used.
As disclosed in inventions such as Japanese Patent Publication No. 15241 and Japanese Patent Publication No. 58-41962, an embodiment has been devised in which cutting blades are exchanged by bringing a tip into contact with an indexing member.

<Problem to be solved by the invention> However, in the cutting tool structure based on the above-mentioned prior art, since the cutting blade is replaced by bringing the tip into contact with the indexing member, It had a drawback that it could cause damage.

Further, since the tip is rotated by the action of bringing it into contact with the indexing member, the rotation angle of the tip is limited, and as a result, the shape of the tip is limited, resulting in a difficulty in that the degree of freedom in selecting the tip is small.

In addition, the operation of changing the cutting blade cannot be performed in one action, and the operation of moving the chip is required, resulting in the inconvenience that corner changes cannot be performed quickly.

<Purpose of the Invention> The purpose of this invention is to solve the problems of the cutting tools based on the prior art described above, and to make it possible to perform corner changes quickly and to have a degree of freedom in setting the rotation angle of the tip. In this way, it is an object of the present invention to provide an excellent cutting tool structure that is useful in the field of processing technology application in the machine manufacturing industry.

<Means/effects for solving the problem> In accordance with the above-mentioned purpose, the structure of this invention, which is summarized in the scope of the above-mentioned utility model registration claim, is to solve the above-mentioned problem. When changing the cutting edge of a freely attached tip, by operating a lever provided on the body, the locator that holds the tip is released from the tip via a clamp lever linked to the lever, and then, The plunger operates later than the clamp lever through the push-pull rod inserted therein and the hole in the plunger, thereby rotating the roller that is in contact with the support shaft, causing the tip to interfere with the locator. The cutting blade is exchanged by rotating the tip by a predetermined angle without moving, and then by turning the lever in the opposite direction to the above, the chip is held by the locator and the roller is moved back to a position away from the support shaft. Therefore, a technical measure was taken to prevent the chip from rotating back.

<Example> Next, an example of this invention will be described below based on the drawings.

The embodiment shown in Figs. 1 and 2 is a corner chain bit (hereinafter simply referred to as a bit) 1 as a cutting tool that forms the center of the gist of this invention. ), a throw-away type diamond-shaped chip 4 is attached to the top of the bottom plate 3 on the two-pronged surface 5' of the locator 5 as a fixing device.
5', it can be fixed by pressure contact.

Therefore, the tip 4 and the bottom plate 3 are
As shown in Figures 5 and 8, the screw 7 is fitted onto the upper part of the support shaft 6 which is rotatably supported by the body 2, and the support shaft 6 is screwed onto the upper end of the support shaft 6.
It is fixed by expanding the upper part, and can be removed and replaced by contracting it.

A tapered part 10 is formed on the lower side of the tip 4 of the support shaft 6, and a fork-shaped lock lever 9 fixed to the locator 5 with a screw 8 is clamped thereon. is formed.

In the vicinity of the support shaft 6, as shown in FIG.
is urged in a direction away from the support shaft 6 via the torsion spring 14 as described below, and the shaft 13
The roller 1 has a small diameter portion 15 and a large diameter portion 16.
7 is rotatably supported.

Incidentally, as shown in FIG. 5, the shaft 13 is supported by a bolt 12 on a cantilever with respect to the guide 2'.
The shank of the bolt 12 is slidable into the long hole 12' of the guide 2' as shown in FIG. is made possible.

O-rings 18, 18, and 19 as friction members are attached to the small diameter portion 15 and the large diameter portion 16, respectively.

Further, the O-ring 19 of the large diameter portion 16 is attached to the support shaft 6.
It is made to be able to freely come into contact with and separate from the knurled portion 11 of.

The O-ring 18 of the small diameter portion 15 of the roller 17,
18, a plunger 20 that slides inside the body 2;
A knurled portion 20' at the tip of the plunger 20 can be brought into contact with the joint 2 from the side.
It is connected to a push-pull rod 21 that passes through the body 2, and is further linked via a drive shaft 23 to a pin 25 eccentrically provided on a bush 24' at the tip of a rotatable lever 24 provided at the base of the body 2. has been done.

Then, pin 1 is placed on one side of the midway part of locator 5.
4' is fixedly attached to the torsion spring 14.
The roller 17 is normally urged away from the support shaft 6 by engaging with the tip of the roller 17 .

As shown in FIG. 1, the drive shaft 23 has a groove 26 having a tapered portion in the front part, and the groove 26 is inserted into the body 2 and is biased by a spring 27. The drive shaft 23 is engaged with the tapered portion to urge the drive shaft 23 toward the distal end.

In addition, the plunger 20, push-pull rod 21, joint 22, drive shaft 23, lever 24
This constitutes an operating body for the chip 4 and locator 5.

Further, a push-pull rod 21 is inserted and fixed into the joint 22, and a drive shaft 23 is attached via a nut 29 so that the stroke of the push-pull rod 21, that is, the plunger 20 can be adjusted. There is.

Further, the joint 22 is linked to a clamp lever 31 as a clamp body via a spring 30 for removing timing and bumps, and an inclined groove (not shown) formed on the top surface of the tip of the clamp lever 31 is connected to a protrusion (not shown) of the locator 5. As the clamp lever 31 moves forward and backward, the locator 5 slides forward and backward in the directions of arrows in FIG. 4 to fix and release the tip 4.

As shown in FIG. 6, the nut 29 allows the stroke of the push-pull rod 21 to be adjusted by removing a cover 33 fixed to the body 2 with bolts 32.

The push-pull rod 21 has its rod head 34 connected to the plunger 20, as shown in FIGS.
The plunger 20 is inserted into a hole 35 formed therein, and when retracting, the plunger 20 is configured to retract with a time lag.

The rod head 34 and the hole 35 constitute a stroke adjusting body for the plunger 20.

In addition, in order to adjust the screw 36 and ball plunger 37 provided on the clamp lever 31, the cover 39 can be removed from the body 2 using bolts 38.

In the above configuration, when performing a corner change to replace the cutting edge of the tip 4, first pull down the lever 24 in the direction of the arrow in FIG.
The drive shaft 23 is pulled by a pin 25 provided at an eccentric position 4'.

Then, the joint 22 is pulled through the nut 9, and the push pull rod 21 and the joint 2
The clamp lever 31 that locks onto the spring 3
Since the locator 5 is pulled with the timing adjusted by 0, as shown in FIG.
The lock lever 9 begins to slide backward in the direction of the arrow in FIG. 10C, rotatably opening the locator 5 and the chip 4 fixed to the support shaft 6.

At this time, the roller 17 and the support shaft 6 are slightly separated by the torsion spring 14.

In this case, the push-pull rod 21 is pulled simultaneously with the clamp lever 31, but the plunger 2
0 is pulled later than the push-pull rod 21 by the rod head 34 at the tip of the push-pull rod 21 and the hole 35 of the plunger 20, so that the plunger 20 is pulled as shown in FIG. As shown, it has not moved yet.

Next, by further rotating the lever 24,
The push pull rod 21 and the clamp lever 31 move backward, and the locator 5 releases the tip 4 as shown in FIG. As shown in FIG. 2, the roller 17 is pushed along the long hole 12' of the guide 2', and the O-ring 1
9 is brought into contact with the support shaft 6.

Furthermore, as the push-pull rod 21 retreats as shown in FIG. The roller 17 is rotated by coming into contact with the O-rings 18, 18 of the small diameter portion 15, and the support shaft 6, that is, the tip 4, is rotated 180 degrees via the O-ring 19, as shown in FIG.

Therefore, the roller 1 rotates by the knurled portion 20' at the tip of the plunger 20 via the O-ring 18 of the friction member of the small diameter portion 15 of the roller 17.
Since the O-ring 19 of the large diameter portion 16 of No. 7 rotates the support shaft 6, the chip 4 can rotate 180 degrees without interfering with the locator 5 and causing damage.

During this time, the knurled portion 20' of the plunger 20
and the knurled portion 11 of the support shaft 6 are each O-ring 1.
8, 18, and 19, corner changes can be performed reliably without slipping.

Also, one end of the torsion spring 14 is supported by the pin 14' of the locator 5, and since the shaft 13 is urged toward the pin 6, the roller 17 is attached to the support shaft when the locator 5 retreats. Since it is pressed toward the support shaft 6, the rotation can also be transmitted to the support shaft 6.

In this case, the torsion spring 14 absorbs the displacement of the pin 14'.

Furthermore, by adjusting the operation timing of the clamp lever 31 with respect to the joint 22 and adjusting the tension stroke of the drive shaft 23 in advance using the screw 36 and nut 29, the rotation angle of the support shaft 6 can be set optimally. I can do it.

Then, when the lever 24 is raised again in the direction of the arrow in FIG. 2, the drive shaft 23 moves forward, and the clamp lever 31 moves forward via the joint 22. 5 moves forward in the opposite direction to the above and begins to hold the chip 4 together with the lock lever 9, the pin 14' loosens the torsion spring 14 and begins to separate the roller 17 from the support shaft 6, and then the push-pull rod 21 After a delay of the time required for the rod head 34 at the tip of the plunger 20 to move through the hole 35 of the plunger 20, the plunger 20 moves forward and begins to move the roller 17 back from the elongated hole 12', as shown in FIG.

Then, as shown in FIG. 13, the locator 5 clamps the chip 4, and the roller 17 separates from the support shaft 6, returning to the initial state.

In this case, when the locator 5 moves forward, the support shaft 6 of the roller 17 by the torsion spring 14
The rotation of the roller 17 is no longer transmitted to the support shaft 6 because the pressing force has begun to be released.

As shown in FIG.
is securely pressed downward.

Also, when replacing the chip 4, the screw 7
If it is removed from the upper part of the support shaft 6, it can be easily removed from the head of the support shaft 6 which has been reduced in the radial direction.

It goes without saying that the embodiment of this invention is not limited to the above-mentioned embodiments. For example, the tool is not limited to a cutting tool, and the tip may be a circular tip other than a rhombus. The rotation angle of the chip is not limited to 180°, and various modes such as indexing can be adopted.

<Effects of the Invention> As described above, this invention provides an excellent effect in that corner changes can be quickly performed without basically causing any damage to the chip.

In addition, since the roller supported by the body can freely come into contact with the support shaft and can also rotate via a lever, the tip can be rotated in one action using the lever, and the cutting tool can be fixed. This has the excellent effect of allowing corner changes to be made at that position without any movement.

Furthermore, the lever is connected to a clamp lever that locks on the locator, and a stroke adjustment body for the locator is interposed, so that the tip rotated by the lever via the plunger does not interfere with the locator. It becomes possible to release the clamp lever faster than the rotation of the tip, and an excellent effect is achieved in that damage to the tip due to interference with the locator of the tip can be prevented.

In addition, since corner changes can be performed in one action, the overall machining time can be shortened, which also has the advantage of reducing machining costs.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention,
Figures 1 and 2 are a partially cutaway plan view and the same cross-sectional view, Figures 3 and 4 are operational explanatory diagrams of the main parts, Figure 5 is a front view of the main parts, and Figure 6 is the part shown in Figure 2. Rear view, Fig. 7 is a side view of Fig. 2, Fig. 8 is a cross-sectional view of Fig. 1, Fig. 9 -
Figures 13 A, C, H, CH, and N are plan views of the locator and chip assembly, and Figures 9 to 13 B, D, T, LI, and L are partial cross-sectional views of the plunger, roller, and support shaft assembly;
FIG. 10E is a front view of the guide. 2...Body, 4...Chip, 2'...Guide,
4'... Chip side, 6... Support shaft, 5... Fixture, 5... Locator, 1... Cutting tool, 11...
Roller, 31... Clamp lever, 14... Torsion spring, 14'... Pin, 9... Lock lever, 20... Plunger, 21... Push pull rod, 34... Rod head, 35...
Hole section, 18, 19...Friction member, 1, 15...Small diameter section, 16...Large diameter section, 17...Roller, 22...
...Joint, 30...Spring.

Claims (1)

[Claims for Utility Model Registration] In a cutting tool structure in which a tip provided at the tip of the body is detachably attached to a rotatable support shaft and can be press-fixed via a locator, the tip comes into contact with the side surface of the tip. A locator protrusion that fits into a slide groove formed on the two surfaces and the upper surface of the front end of the clamp lever, and a pin and support shaft that locks a torsion spring for bringing the friction member into contact with and away from the support shaft. a locator that is equipped with a lock lever that engages and disengages the tip to fix the chip; and a locator that is engaged with the tip of the push-pull rod that slides in the body to cause a time lag with the movement of the locator. The rod head, which is fixed to the tip of the rod, has a plunger inside which has a hole through which it can move by the required distance, and a large diameter part and a small diameter part with the above friction member attached to the outer periphery, and the above torsion spring at one end. The other end of the clamp lever has a roller supported on the body guide so as to be able to come into contact with and separate from the support shaft, and the rear end of the clamp lever has a joint into which the push-pull rod is inserted. A cutting tool structure characterized in that the cutting tool is engaged by a spring for removing crushing.