JPH10146701A - Rotary cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting tool which can stably cut a work for a long time. SOLUTION: This cutting tool has a throwaway chip 10 whose flat plane is circular, a holder 20 having a chip seat 21 for holding the throwaway chip 10 and cylindrical shell 22, and a tool body provided with a mounting depression 31 for rotatably holding the shell of the holder 20. The mounting depression 31 is tapered toward the bottom thereof and holding means 40 for rotatably holding the shell of the holder 20 in the inner peripheral surface side of the mounting depression in the state whore in can be moved in the direction of the depth of the depression 31 is interposed between the shell of the holder 20 and the inner circumferential surface of the mounting depression 31 to make a gap between the bottom of the shell of the holder 20 and the bottom of the mounting depression 31 and the holder 20 is urged by urging means 50 to the bottom side of the mounting depression 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary tool in which a throw-away tip having a circular flat surface is rotatably provided on a tool body, and more particularly to a rotary tool provided on a tool body by use. It is characterized in that stable cutting can be performed for a long period of time without rattling.

[0002]

2. Description of the Related Art Conventionally, in a turning or boring system, when machining the inside and outside diameters of an object to be cut, a generally disk-shaped indexable insert is provided at the tip of a tool body as a cutting tool. A seat is used in which the throw-away tip is fixed to the tip seat with screws.

[0003] In such a cutting tool,
As described above, the cutting is performed by the cutting edge of the disc-shaped throwaway tip fixed to the tip seat,
Whenever the cutting blade is worn or broken, the screw fixing the throw-away tip is loosened to change the mounting position of the throw-away tip.

However, when the cutting edge of the indexable insert is worn or broken,
It is very troublesome to stop the cutting and change the attachment position of the throw-away tip, and there is a problem that continuous cutting cannot be performed and much time is required for cutting.

For this reason, in recent years, Japanese Patent Laid-Open No. 7-2
41701, JP-A-7-241702, JP-A-7-241703, JP-A-7-328807
As shown in the publication, a rotary tool is provided which is provided with a rotating shaft or the like at the center of a disc-shaped throw-away tip and rotatably holds the throw-away tip in a tool body. Reached.

Here, in the case of such a rotary tool, since the indexable insert is rotatably held by the tool body, the indexable insert rotates during cutting, and a part of the cutting edge in the indexable insert. Wear is reduced, the entire cutting edge is evenly worn, and continuous cutting can be performed over a long period of time.

[0007] However, when the workpiece is cut while rotating the throw-away tip, the rotation of the throw-away tip causes the rotation axis attached to the throw-away tip and the tool body holding the rotary axis. Portion gradually wears out, which causes the throw-away tip held by the tool body to rattle, so that accurate cutting cannot be performed stably over a long period of time.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problem in a rotary tool in which a disc-shaped indexable insert is rotatably held on a tool body. It is an object of the present invention to ensure that accurate cutting can be stably performed over a long period of time without rattling of the indexable insert held by the tool body due to long-term use.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a rotary cutting tool 10 according to the present invention has a round-shaped tip 10 having a circular flat surface.
And a holder 20 having a tip seat 21 for holding the indexable tip 10 and a cylindrical body 22.
And a tool body 30 provided with a mounting recess 31 for rotatably holding the body 21 of the holder 20, such that the mounting recess 31 is tapered toward its bottom so as to contract. The mounting recess 31 is formed so as to be movable in the depth direction of the mounting recess 31.
The holding means 40 for rotatably holding the body 21 of the holder 20 on the inner peripheral surface side of the holder 20 is disposed between the body 21 of the holder 20 and the inner peripheral surface of the mounting recess 31. Of the body 21 and the mounting recess 3 in FIG.
A gap is provided between the holder 20 and the bottom of the mounting recess 31 and the holder 20 is biased toward the bottom of the mounting recess 31 by the biasing means 50.

In the rotary cutting tool according to the present invention, as described above, the throw-away tip 10
Is held by the tip seat 21 of the holder 20 and the body 22 of the holder 20 is held by the mounting recess 31 of the tool body 30 so that the mounting recess 31 is tapered toward the bottom as described above. The holding unit 40 movably provided in the depth direction of the mounting recess 31 holds the body 21 of the holder 20 rotatably, and at the same time, the bottom of the body 21 of the holder 20 and the mounting recess 31. The holder 20 is urged toward the bottom of the mounting recess 31 by the urging means 50.

In this way, the cutting of the workpiece is performed while rotating the indexable insert 10,
When the body 21 and the holding means 40 of the holder 20 are worn by rotation, the holder 20 and the holding means 40 are moved to the bottom side of the tapered mounting recess 31 by the urging means 50. As a result, the holder 20 is maintained in close contact with the mounting recess 31 via the holding means 40, so that the throw-away tip 10 does not rattle due to wear of the holder 20, the holding means 40 and the like.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotary tool according to an embodiment of the present invention will be specifically described below with reference to the accompanying drawings.

In the rotary tool according to this embodiment, as shown in FIGS. 1 (A) and 1 (B), a throw-away tip 10 having upper and lower surfaces in a circular shape and using a corner of the circumference as a cutting edge 11. The flathead screw 12 is attached through the mounting hole 13 so as to taper from the center of the upper and lower surfaces of the throwaway tip 10 toward the center in the thickness direction of the throwaway tip 10, respectively. To be provided.

In the holder 20 for holding the throw-away tip 10, as shown in FIG.
1 is provided on the upper surface of a flange portion 23 protruding outward from the cylindrical body portion 22, and upwardly at the center of the chip seat 21 so as to correspond to the mounting hole 13 of the throw-away chip 10. A projecting portion 24 projecting so as to contract in a tapered shape is provided, and a screw hole 25 for attaching the flathead screw 12 is provided at a central portion of the projecting portion 24.

Then, the projection 24 provided on the tip seat 21 of the holder 20 as described above is fitted into the mounting hole 13 of the throw-away tip 10, and in this state, the projection 24
The countersunk screw 12 is passed through the mounting hole 13 on the opposite side into which the is fitted, and the countersunk screw 12 is screwed into the screw hole 25 provided in the protrusion 24, and the indexable tip 10 is inserted into the tip seat 21 of the holder 20. I tried to attach it. In this way, the throw-away tip 10 is
When the tip is mounted on the tip seat 21, the circular surface of the throw-away tip 10 is in close contact with the flat portion of the tip seat 21, and the mounting hole 13 of the throw-away tip 10 is in close contact with the protrusion 24 in the tip seat 21. Thus, the throw-away tip 10 is securely fixed to the holder 20 without rattling.

In the holder 20, the body 22 is moved from the cylindrical body 22 to the side opposite to the flange 23.
The attachment shaft 26 having a smaller diameter is extended.

On the other hand, as shown in FIG. 3, the tool body 30 for rotatably mounting the throw-away tip 10 is provided with a mounting portion 32 by cutting off a tip end thereof. A mounting recess 31 into which the body 22 is inserted is provided so as to be tapered toward the bottom thereof, and a through hole 33 through which the mounting shaft 26 of the holder 20 is inserted through the center of the bottom of the mounting recess 31. Was provided.

Then, the above-mentioned throw-away tip 10
In order to rotatably attach to the tool main body 30, as shown in FIGS. 4 and 5, the throw-away tip 10 is attached to the tip seat 21 of the holder 20 as described above. The part 22 is inserted into the mounting recess 31 of the tool body 30, and the mounting shaft 26 of the holder 20 is projected from the mounting recess 31 through the through hole 33.

When the body 22 of the holder 20 is inserted into the mounting recess 31 of the tool body 30, the body 21 of the holder 20 is located on the inner peripheral surface side of the mounting recess 31.
Is rotatably held as a holding means 40 having a cylindrical shape with a thickness decreasing toward the bottom side of the mounting recess 31, and an inner circumference being maintained at a constant diameter, while an outer circumference facing the bottom side of the mounting recess 31. Spacer material 41 contracted in a tapered shape
The outer peripheral surface is provided to be movable in the depth direction of the mounting concave portion 31 so that the outer peripheral surface is in close contact with the inner peripheral surface of the mounting concave portion 31.
Between the inner peripheral surface of the spacer member 41 and the outer peripheral surface of the body portion 22 of the holder 20, a plurality of rollers 42 extending in the axial direction of the holder 20 are provided at predetermined intervals in the circumferential direction,
The rollers 42 allow the holder 20 to rotate smoothly in the mounting recess 31, and a gap is formed between the bottom of the body 21 of the holder 20 and the bottom of the mounting recess 31.

Further, in this embodiment,
The upper end of the spacer material 41 and the flange 2 of the holder 20
A ring-shaped bearing 61 is provided between the lower surface of the holder 3 and the lower surface of the holder 3 so that the holder 20 can rotate more smoothly in the mounting recess 31.

Further, as described above, the body portion 22 is
When the holder 20 inserted into the holder 20 is urged toward the bottom of the mounting recess 31 by the urging means 50, in this embodiment, the holder 20 is penetrated on the side where the mounting shaft 26 protrudes as described above. A ring-shaped bearing 62 is provided at the hole 33 and the mounting shaft 26 of the holder 20 is provided.
Are projected through the bearing 62, and the nut 52 is attached to the projected mounting shaft 26 via the spring washer 51.
The spring washer 51 is attached to the bearing 62 described above.
The holder 52 is attached to the tool body 30 by tightening the nut 52 so as to press the holder 20. With this configuration, the holder 20 is urged toward the bottom of the mounting recess 31 by the action of the spring washer 51,
The holder 20 attached to the tool body 30 can be rotated by the bearing 62 described above.

The cutting edge 11 at the corner of the circumference on the upper surface of the indexable insert 10 rotatably attached to the tool body 30 via the holder 20 is pressed against the work to be cut. While rotating the cutting edge 10, the cutting edge 1 of the indexable insert 10
1 was used to cut the workpiece.

Here, when the workpiece is cut while rotating the throw-away tip 10, the holder 20 rotates together with the throw-away tip 10,
By the rotation of the holder 20, the above-described roller 42,
The ball 61a of the bearing 61 provided between the inner peripheral surface of the spacer member 41 and the upper end of the spacer member 41 and the lower surface of the flange portion 23 of the holder 20 is worn.

However, in the rotary cutting tool according to this embodiment, since the holder 20 is urged toward the bottom of the mounting recess 31 by the action of the spring washer 51 as described above, the inner circumference of the roller 42 and the spacer member 41 are reduced. When the surface is worn, the spacer member 41 and the roller 42 move together with the holder 20 to the bottom side of the mounting concave portion 31 which has contracted in a tapered shape, and the holder 20 is mounted via the spacer member 41 and the roller 42. The ball 61a of the bearing 61 comes to be maintained in close contact with the recess 31.
Is worn out, the holder 20 moves to the bottom side of the mounting recess 31, and the holder 2 is moved through the bearing 61.
The zero flange 23 comes into close contact with the spacer material 41, so that the throw-away tip 10 attached to the holder 20 does not rattle.

As a result, when the rotary cutting tool according to this embodiment is used, even when cutting is performed for a long period of time while rotating the throw-away tip 10, the throw-away tip 10 does not rattle and can be used for a long time. Accurate cutting can be performed stably.

[0026]

As described above in detail, in the rotary cutting tool according to the present invention, when the body of the holder holding the throw-away tip on the tip seat is held in the mounting recess of the tool body, the mounting recess is used. The holder is formed so as to contract in a tapered shape toward the bottom, and a holding means provided so as to be movable in the depth direction of the mounting recess allows a gap to be generated between the bottom of the body of the holder and the bottom of the mounting recess. The holder is rotatably held, and the holder is urged to the bottom side of the mounting recess by the urging means. Therefore, when the body or the holding means of the holder is worn by rotation, the urging means is used. As a result, the holder and the holding means move to the bottom side of the tapered mounting recess, and the holder is maintained in close contact with the mounting recess via the holding means. It became way.

As a result, in the case of the rotary tool according to the present invention, as a result of cutting the workpiece while rotating the indexable insert attached to the tool body via the holder, the body of the holder, the holding means, etc. Even if worn, the throw-away insert held by the holder does not rattle, and accurate cutting can be stably performed over a long period of time.

[Brief description of the drawings]

FIG. 1 is a sectional view and a plan view of a throw-away tip used in a rotary tool according to an embodiment of the present invention.

FIG. 2 is a front view of a holder used in the rotary tool according to the embodiment.

FIG. 3 is a perspective view of a tool main body used in the rotary tool according to the embodiment.

FIG. 4 is an explanatory cross-sectional view showing a state in which a throw-away tip is attached to a tool main body via a holder in the rotary tool according to the embodiment.

FIG. 5 is a perspective view of the rotary tool according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Throw-away tip 20 Holder 21 Tip seat 22 Body 30 Tool main body 31 Mounting recess 40 Holding means 41 Spacer material 42 Roller 50 Urging means 51 Spring washer 52 Nut

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Katsunori Shimonosono 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation

Claims (1)

[Claims] 1. A holder 20 having a throw-away tip 10 having a circular planar shape, a tip seat 21 for holding the throw-away tip 10 and a cylindrical body 22; and a body of the holder 20. In a rotary tool having a tool body 30 provided with a mounting recess 31 that rotatably holds the mounting 21, the mounting recess 31 is formed so as to taper toward the bottom thereof,
The holding means 40 for rotatably holding the body 21 of the holder 20 on the inner peripheral surface side of the mounting recess 31 in a state in which the body 21 is movable in the depth direction of the mounting recess 31 is attached to the body 2 of the holder 20.
1 and the inner peripheral surface of the mounting recess 31, a gap is provided between the bottom of the body 21 of the holder 20 and the bottom of the mounting recess 31 by the holding means 40, and the holder 20 is biased by the urging means. A rotary cutting tool characterized in that the cutting tool is urged toward the bottom of the mounting recessed portion by 50.