JPH04304908A - Cutting tool - Google Patents

Abstract

PURPOSE:To perform the fine adjustment of a cartridge with the rotating operation of a rotating member by transmitting the movement in the axial direction of the rotating member with the axial directional movement thereof being shortened by the inclined face of the cartridge via the sliding in the axial direction of the rolling body abutting on the inclined face of the rotating member. CONSTITUTION:In the case of finely adjusting the projection distance of a tip 4 from a tool main body 1, namely in the case of moving a cartridge 2, the operation part 3A of a rotating member 3 is operated with its rotation with the hexagonal part 3b thereof being held. The operation part 3A is then moved in the axial direction for the main body 1 because of the screw part 3h thereof being screwed with the screw part 1h of the main body 1. Simultaneously also, the intermediate ring 3B incorporated in the main body 1 is also moved to the internal part. As a result, a rolling body 5a abutting on the inclined face 3d of the intermediate ring 3B and the support face 1d of a projection part 1c is moved toward the shaft center. When the rolling body 5a is then abutted on the inclined face 2d set in the reverse slope to the above inclined face 3d, the cartridge 2 is moved in the direction of a tip 4 against the resilient member 6.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool such as a boring tool, and more particularly to a cutting tool in which the mounting position of a cutting tip can be finely adjusted.

0002

[Prior Art] Conventionally, when performing boring processing, etc., a center is placed at the tip of the main spindle M of a machine tool in the direction Y-Y orthogonal to the axis X-X of the main spindle M, as shown in FIG. A cutting tool B1 such as a boring tool is attached, and machining is performed using the cutting tip 4 attached to the tip of the tool B1 while rotating the main spindle M or workpiece W.

The cutting tool B1 used at this time is:
As shown in FIG. 7, a similarly cylindrical rotating member 13 is slidably inserted into the cylindrical main body 11 extending in the Y-Y direction, and the cartridge 12 is inserted into the rotating member 13. It was inserted. This cartridge 12 has a tip attachment part 12a for fixing a cutting tip at its tip, and a cylindrical part 12b fixed integrally with a bolt 12e.
, a triangular shaft 12d, and a spring seat 12c. Further, this cartridge 12 has a threaded portion 12h on the outer surface of the cylindrical portion 12b.
It is screwed into a threaded portion 13h formed on the inner surface of the rotating member 13. A protrusion 11 formed on the inner surface of the main body 11
c and the spring seat 12c of the cartridge 12, disc springs 16, 16 are interposed between the cartridge 12 and the spring seat 12c of the cartridge 12.
is always urged inward of the main body 11. In addition, the main body 11
The hole 11d formed by the inner protrusion 11c has a non-circular cross section as shown in FIG.
The triangular shaft 12d is engaged to form a rotation stopper.

In the cutting tool B1 having such a configuration, when the cutting tool B1 is used, the cutting tip 4 is moved from the axis X-X of the main shaft M in FIG.
Make slight adjustments to the set distance to the cutting edge 4a. In that case, the rotating member 13 shown in FIGS. 7 and 8 is
3b with respect to the main body 11, the cartridge 12 with a rotation stopper is rotated through the threaded portions 12h, 1.
3h, it moves inside the cylinder of the rotating member 13 along the axial direction of the rotating member 13.

[0005] Normally, such a fine adjustment mechanism in the cutting tool B1 is for performing high-precision cutting, and is used to control the mounting flange 11a of the main body 11 and the rotating member 13.
A scale is attached to the flange portion 13c to indicate the amount of rotation of the rotating member 13. (For example, Jikko 56-5
4002. )

[0006]

[Problems to be Solved by the Invention] By the way, in order to machine a workpiece with higher accuracy, it is preferable that the above-mentioned cutting tool be able to perform further minute adjustments.

In the cutting tool B1, while the disc spring 16 urges the cartridge 12 to which the chip 4 is fixed inward of the main body 11, the rotating member 13 locked to the main body 11 pushes the threaded portion 12h. , 13h, and has a simple member structure. However, the threaded portion 12h formed on the cylindrical portion 12b of the cartridge 12 and the threaded portion 13h formed on the inner surface of the rotating member 13 are generally formed by thread machining in accordance with a predetermined standard. The limit for fine adjustment of the set distance from the axis XX to the cutting edge 4a of the cutting tip 4 depends on the machining pitch of the screw. Furthermore, it is also affected by the processing accuracy of the threaded portions 12h and 13h.

[0008] The present invention was made in view of the above-mentioned circumstances, and its purpose is to enable even more minute adjustments to be made easily compared to conventional cutting tools.
An object of the present invention is to provide a cutting tool that can perform cutting with higher precision.

[0009]

[Means for Solving the Problems] In order to solve the above problems, the cutting tool of the present invention includes: a cylindrical main body having a protrusion on the inner surface; a cylindrical rotating member screwed into the main body;
A cartridge slidably inserted into the rotating member;
A cutting tool comprising a cutting tip fixed to the cartridge, and a resilient member interposed between the main body and the cartridge to urge the cartridge inward into the main body, An inclined surface is formed on the circumferential side of the cartridge so as to approach the axis of the rotary member toward the cutting tip, and an outer surface of the cartridge facing the inclined surface has a slope opposite to the inclined surface. A support surface is formed on the protruding portion to form a space between the two slopes, and the space has a rolling surface that comes into contact with both the slopes and the support surface. It is characterized by the presence of a moving object.

0010

[Operation] When finely adjusting the protruding distance of the tip of the cutting tool from the main body in the axial direction of the rotating member, rotate the rotating member that is threaded onto the inner surface of the main body, and rotate the rotating member against the main body. Move in the axial direction.

When the rotating member is moved inward into the main body, the inclined surface formed on the rotating member approaches the axis of the rotating member as it approaches the cutting tip. The rolling elements in contact with the support surface are moved toward this axis. On the other hand, the cartridge is constantly urged into the main body by the resilient member. and,
An inclined surface formed on the outer surface of the cartridge opposite to the inclined surface comes into contact with the rolling element, and this inclined surface is formed as an inclined surface having a slope opposite to that of the inclined surface of the rotating member. The cartridge is moved in the direction of the cutting tip by moving the rolling element in the axial direction.

Contrary to the above, when the rotary member is rotated and moved outward from the main body, that is, in the direction of the chip, the slope formed on the cartridge is urged inward from the main body by the resilient member. The surface causes the rolling element to move away from the axis of the rotating member, and at the same time moves the cartridge inward into the body.

In this way, the cartridge, which is urged inward of the main body by the resilient member, is supported by the support surface and the inclined surface of the rotating member via the rolling element that contacts the inclined surface of the cartridge to maintain balance. are doing. The axial movement of the rotating member is caused by the inclined surface formed on the cartridge through the sliding movement of the rolling element that comes into contact with the inclined surface of the rotating member and the support surface of the protrusion toward the axis of the rotating member. Since the movement of the rotating shaft of the cartridge in the axial direction is reduced, it is possible to adjust the movement of the cartridge in the axial direction by an extremely small amount by rotating the rotating member.

[0014]

Embodiments An embodiment of the present invention will be explained based on FIGS. 1 to 5.

As the side cross section of the cutting tool A1 of the present invention is shown in FIG. Consisting of

The main body 1 is cylindrical and has a circumferential protrusion 1c formed on its inner surface, and is provided with a mounting flange 1a on one end surface, to which it is fixed to a machine tool with bolts. Attachment grooves 1b, 1b are opened for this purpose. The cylindrical rotating member 3 includes an intermediate ring 3B and an operating portion 3A, with the intermediate ring 3B being slidably inserted into the main body 1, and the operating portion 3A having a threaded portion 3h formed on its outer surface. It is screwed into a threaded portion 1h formed on the inner surface of the main body 1. The operating portion 3A of the rotating member 3 and the intermediate ring 3B are slidably in contact within the main body 11.

A cartridge 2 to which a cutting tip 4 is fixed is slidably inserted into the rotating member 3. This cartridge 2 includes a tip attachment portion 2a that protrudes outward from a rotating member 3 for fixing a cutting tip 4.
It consists of a cylindrical portion 2b inserted into the rotating member 3, and a spring seat 2c integrally fixed to the cylindrical portion 2b with a bolt 2e. Further, as shown in FIG. 3, the spring seat 2C is provided with notches 2f, 2f on its periphery, and is engaged with protrusions 1g, 1g protruding from the other end of the main body 1, so that the spring seat 2C can be engaged with the cartridge 2. A rotation stopper for the main body 1 is formed. Although the cutting tip 4 has various shapes, it is fixed with its cutting edge 4a protruding from the tip attachment portion 2a of the cartridge 2.

Furthermore, the spring seat 2c of the cartridge 2
Resilient members 6, 6 are interposed between the projecting portion 1c in the main body 1 and constantly bias the cartridge 2 in the direction in which the chip attachment portion 2a thereof is drawn inward into the main body 1. There is. In this embodiment, the resilient member 6 is composed of a plurality of coil springs, and is engaged with a support hole formed in the protrusion 1c to urge the spring seat 2c outward of the main body 1.

In the cutting tool A1 of the present invention, in addition to the above-mentioned configuration, on the inner peripheral side of the intermediate ring 3B of the rotating member 3,
The axis of this rotating member 3 (
The shaft is also the shaft of the main body 1, and will be simply referred to as the shaft hereinafter. ) is formed. Furthermore, an inclined surface 2d having a slope opposite to that of the inclined surface 3d is formed on the outer surface of the columnar portion 2b of the cartridge 2, which faces the inclined surface 3d.

On the other hand, on the protrusion 1c on the inner surface of the main body 1, a support surface 1d is formed on the chip 4 side to indirectly support the cartridge 2 urged by the resilient member 6, and this support surface 1d and A space P is formed by both the inclined surfaces 2d and 3d. A rolling element 5a is interposed in this space P.

Further, as shown in FIG. 4, the two inclined surfaces 2d and 3d are arranged between the intermediate ring 3B and the cylindrical portion 2b in order to reduce the moving distance of the rotating member 3 and transmit the information to the cartridge 2. Extension line L of the sliding surface and both slopes 2d and 3d
Regarding each of the angles θ2 and θ3 formed by It is preferable that the angle θ3 formed between the inclined surface 3d and the extension line L is an acute angle.

[0022] The above-mentioned inclined surfaces 2d and 3d are usually formed into tapered surfaces, and the rolling element 5a has both the above-mentioned inclined surfaces 2
A sphere that comes into contact with d, 3d and the support surface 1d,
A plurality of ring members are provided, which slide on these inclined surfaces 2d, 3d and support surface 1d by changing the relative position between the intermediate ring 3B of the rotating member 3 and the cartridge 2. Note that, as shown in FIG. 2, the mounting flange 1a of the main body 1 and the flange 3c of the operating portion 3A are provided with scales for performing slight rotation operations.

Next, the operation of the cutting tool A1 having such a structure will be explained.

When finely adjusting the protruding distance of the tip 4 from the main body 1 of the cutting tool A1 in the axial direction, that is, when moving the cartridge 2, the operating portion 3A of the rotating member 3 is moved to the hexagonal position shown in FIG. Grip and rotate the portion 3b. Since the threaded portion 3h of the operating portion 3A is screwed into a threaded portion 1h formed on the inner surface of the main body 1, the operating portion 3A moves in the axial direction with respect to the main body 1. When the operating portion 3A is rotated and moved inward of the main body 1, the intermediate ring 3B inserted into the main body 1 is also moved inward. Then, intermediate ring 3B
The inclined surface 3d formed on the support surface 1d of the protrusion 1c
The rolling element 5a in contact with the cutting tip 4 is moved toward the axial center because the inclined surface 3d is inclined toward the axial center as it approaches the cutting tip 4. On the other hand, cartridge 2 is
Since it is constantly urged into the main body 1 by the resilient member 6, the cylindrical portion 2 of the cartridge 2 facing the inclined surface 3d
The inclined surface 2d formed on the outer surface at b is the rolling element 5.
a, and this inclined surface 2d is formed as an inclined surface having a slope opposite to that of the above-mentioned inclined surface 3d, so that the rolling element 5
By moving the cartridge 2 in the axial direction of the tip 4
Move it in the direction of.

In contrast to the above, when the operating portion 3A of the rotary member 3 is rotated and moved outward from the main body 1, that is, in the direction of the tip 4, it is pushed inward by the resilient member 6. Due to the inclined surface 2d of the cartridge 2 being pushed, the rolling elements 5a are moved in a direction away from the axis, and the cartridge 2 is moved inward of the main body 1.

In this way, the cartridge 2 urged inward of the main body 1 by the resilient member 6 is moved between the supporting surface 1d and the intermediate ring 3B via the rolling element 5a that comes into contact with the inclined surface 2d.
The balance is always maintained by supporting the inclined surface 3d. The movement of the rotating member 3 in the axial direction related to the operating portion 3A causes the rolling elements 5 to come into contact with the inclined surface 3d of the intermediate ring 3B.
The inclined surface 2d formed on the cylindrical portion 2b of the cartridge 2 causes the cartridge 2 to move in the reduced axial direction through sliding movement toward the axial center of the cartridge 2. As a result, the operating portion 3A This rotational operation makes it possible to adjust the movement of the cartridge 2 in the axial direction by an extremely small amount.

Next, FIG. 5, which is a cross section taken along the line V-V in FIG. 1, shows another embodiment of the intermediate ring 3B of the rotating member 3. 3d, flat inclined surfaces 3e, 3e are formed, and inclined surfaces 3e, 3e are depressed inward of the intermediate ring 3B.
, the rolling elements 5b, 5b, which are cylindrical pins, touch the protrusion 1c.
The support surface 1d and the inclined surface 2d on the side of the cartridge 2 are inserted in contact with each other. If the flat inclined surface 3e is formed in this way and the cylindrical rolling element 5b is inserted,
The member configuration can be made simpler.

[0028]

[Effects of the Invention] Since the present invention is constructed as described above, it achieves the effects described below.

(1) The axial movement of the rotating member is achieved through the axial sliding of the rolling elements that come into contact with the inclined surface formed on the inner peripheral side of the rotating member. As a result, the movement of the cartridge in the axial direction is reduced and transmitted, making it possible to adjust the movement of the cartridge by an extremely small amount by rotating the rotating member.

(2) Since the moving distance of the cartridge to which the cutting tip is fixed is reduced, the cutting tip can be moved from the main body without depending on the machining pitch and the machining accuracy of the threaded part of the rotating member that is screwed into the main body. The protrusion distance can be easily adjusted with extremely high precision.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a cutting tool according to the present invention.

FIG. 2 is a front view on the tip side of the cutting tool according to the present invention.

FIG. 3 is a rear view of the cutting tool according to the present invention on the machine tool main shaft side.

FIG. 4 is a partial cross-sectional view showing an inclined surface formed on the rotating member and the cartridge.

FIG. 5 is a sectional view showing an example in which pins are used as rolling elements.

FIG. 6 is a side sectional view showing a conventional cutting tool attached to the main shaft of a machine tool.

FIG. 7 is a side sectional view of a conventional cutting tool.

FIG. 8 is a front view of the cutting tool on the tip side.

FIG. 9 is a diagram showing a cross-sectional shape of a triangular shaft in a cartridge of a conventional cutting tool.

[Explanation of symbols]

1 Main body 2 Cartridge 3 Rotating member 4 Cutting tip 5a, 5b Rolling elements 6　Blast member 1c Projection part 1d Support surface 2d, 3d　Slope surface

Claims (1)

[Claims] Claim 1: A cylindrical body having a protrusion on the inner surface;
A cylindrical rotating member screwed into the main body, a cartridge slidably inserted through the rotating member, a cutting tip fixed to the cartridge, and an intervening device between the main body and the cartridge. A cutting tool comprising: a resilient member mounted thereon and urging the cartridge inwardly into the main body,
An inclined surface is formed on the inner peripheral side of the rotating member, and the inclined surface is inclined so as to approach the axis of the rotating member toward the cutting tip, and this inclined surface is formed on the outer surface of the cartridge that faces the inclined surface. An inclined surface having an opposite slope is formed in the protrusion, and a support surface forming a space between the two inclined surfaces is formed in the protrusion, and the space has a space between the two inclined surfaces and the support surface. A cutting tool characterized in that a rolling element that comes into contact with is interposed.