JP2001150269A - Tool positioning member of tool holder and tool holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool positioning member capable of enhancing cutting accuracy by making the shaking of a tool as little as possible, and a holder using the member. SOLUTION: The tool positioning member 5 comprising a positioning body 5a made of an elastic material such as hard rubber is threaded into a holder body 1 in such a way as to be movable for adjustment along the central axis O of the holder body 1, with the holder body 1 having a chuck 2 for fixing the tool 10 in place.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool positioning member for determining an axial position of a tool inside a holder body provided with a chuck for fixing the tool, the tool positioning member being movable along a central axis of the holder body. The present invention relates to a tool positioning member in a tool holder provided inside a tool holder and a tool holder using the positioning member.

[0002]

2. Description of the Related Art Conventionally, in a tool holder of this type, for example, a collet chuck is provided at a tip portion of a holder body.
A metal tool positioning member formed in a cylindrical shape is screwed into the screw hole inside the holder body so as to adjust the axial movement of the holder body, and a hexagonal hole for rotating operation is provided inside the tool positioning member. Have been.

In mounting a tool, a tool positioning member is rotated from the outside of the holder body by using the hexagonal hole to position the tool at a required position, and the shank portion of the tool is inserted into the collet chuck. Then, in a state where the rear end of the shank portion is in contact with the front end of the tool positioning member, the tightening nut of the chuck is tightened to grip and fix the shank portion of the tool via the collet.

[0004]

As described above, when the tightening nut is rotated in the tightening direction to grip and fix the tool via the collet, the tool is pulled into the holder body by the collet. However, at this time, since the rear end of the shank portion of the tool is in contact with the front end of the positioning member formed of a rigid metal body, when the tool is pulled into the holder body, the collet is moved in the circumferential direction by the reaction. This causes the tool to be biased and elastically deformed at the portion, thereby causing the tool to be inclined with respect to the holder main body. This causes the tool to oscillate when the tool is used, which causes a reduction in cutting accuracy.

[0005] The present invention provides a tool positioning member which can improve the cutting accuracy by minimizing the runout of the tool as described above, and can surely lubricate the tool edge, and a tool holder using the positioning member. The purpose is to provide.

[0006]

A tool holder according to the first aspect of the present invention is provided inside a holder main body 1 having a chuck 2 for fixing a tool 10 and is brought into contact with a rear end of the tool 10 so as to contact the tool. A tool positioning member 5 for positioning the position 10 at a predetermined position in the holder body 1, and a positioning body 5a, 15a, 25 made of an elastic body such as hard rubber.
a, which is screwed so as to be movable and adjustable along the central axis of the holder main body 1, and relates to the tool rear end positioning members 5, 15, 25 in the tool holder.

According to a second aspect of the present invention, there is provided a tool positioning member for a tool holder according to the first aspect, wherein
The effective diameter of the male screw part 4 formed on the outer periphery of 5a, 25a is slightly larger than the effective diameter of the positioning member mounting female screw part 3 formed inside the holder main body 1.

According to a third aspect of the present invention, in the tool positioning member of the tool holder according to the first or second aspect, a rotary operation hole is provided in the center of the positioning main body. The reinforcing member 16, 26 or 36 having 12 is provided integrally.

According to a fourth aspect of the present invention, there is provided a tool holder according to any one of the first to third aspects.
5 and 25 are provided inside the holder main body 1 provided with the chuck 2 for fixing the tool 10.

[0010]

FIG. 1 shows a main part of a tool holder A according to an embodiment of the present invention. In this figure, 1 is
A cylindrical holder body provided with a collet chuck 2 at a tip thereof. Inside the holder body 1, a hard rubber or the like having a male screw part 4 screwed with a female screw part 3 on the inner peripheral surface thereof formed on the outer peripheral surface is provided. A tool positioning member 5 for positioning the rear end of the tool, which is made of an elastic positioning body 5a, is screwed along the center axis O of the holder body 1 so as to be movable.

The collet chuck 2 has a collet 7 fitted on an outer peripheral tapered inner peripheral surface 6 formed at the distal end of the cylindrical holder main body 1 and a male screw 8 formed on the outer peripheral surface of the distal end of the holder main body 1. And has a well-known structure including a tightening nut 9 screwed into the collet 7 and engaged with the tip of the collet 7. By rotating the tightening nut 9 in the tightening direction, the tool 10 is inserted through the collet 7. Shank part 10
a is gripped and fixed. An oil hole 10b extends through the tool 10 along its axis. Although not shown, a plurality of grooves extending in the axial direction are provided on the inner peripheral surface of the collet 7 at a constant pitch in the circumferential direction.

Positioning body 5a of tool positioning member 5
As shown in an enlarged view in FIG. 2, for example, is made of a hard urethane rubber having excellent elasticity and abrasion resistance. A conical concave portion 11 for receiving the rear end of the shank portion 10a of the shaft 10 is provided.
2 are formed concentrically.

The positioning body 5 of the tool positioning member 5
a, the effective diameter of the male screw portion 4 formed on the outer peripheral surface is larger than the effective diameter of the positioning member mounting female screw portion 3 formed inside the metal holder main body 1 as shown by a virtual line in FIG. It is formed to be slightly larger. Then
When the tool positioning member 5 is screwed into the holder main body 1, the diameter of the positioning member 5 is reduced so strongly that the positioning member 5 can be elastically deformed. The male thread 4 may be screwed into the positioning member mounting female thread 3 of the holder body 1.

In this manner, the effective diameter of the male screw portion 4 of the tool positioning member 5 is formed so as to be slightly larger than the effective diameter of the positioning member mounting female screw portion 3 inside the holder main body 1, and the rear end of the tool is formed. If the male screw portion 4 is screwed into the female screw portion 3 with the diameter of the positioning member 5 reduced or slightly forcibly deformed elastically, the tool positioning member 5 due to vibration or the like during cutting work can be formed. For example, when the cutting oil is circulated inside the holder main body 1 and supplied to the tool cutting edge through a supply hole provided in the tool, the screw between the tool positioning member 5 and the holder main body 1 can be prevented. The oil is supplied to the tool cutting edge from the conical concave portion 11 of the positioning main body 5a and the rear end of the shank portion 10a pressed against the conical concave portion 11 through the oil passage 10b without causing oil leakage from the boundary of the joint portion. Door can be.

According to the tool holder in which the tool positioning member 5 composed of the elastic positioning body 5a of hard rubber or the like is mounted inside the holder main body 1 as described above, the tool positioning adjusted to a required position inside the holder main body 1 is performed. With the rear end of the shank portion 10a of the tool 10 in contact with the conical recess 11 of the member 5, the tightening nut 9 of the collet chuck 2 is held.
When the tool 10 is rotated in the tightening direction, the tool 10 is pulled into the holder main body 1 by the collet 7. However, since the tool positioning member 5 is formed of the elastic positioning body 5a, when the tool 10 is retracted and retreats, The backward displacement of the tool 10 is absorbed by the conical recess 11 of the tool positioning member 5.

As described above, since the backward displacement of the tool 10 is absorbed by the tool positioning member 5, no distortion occurs on the side of the collet 7 holding the shank portion 10a of the tool 10. The shank portion 10a is gripped and fixed by the collet 7 coaxially with the center axis O of the holder main body 1, so that the tool 10 hardly oscillates when the tool is used, and cutting accuracy can be improved.

3A and 3B show a tool positioning member 15 according to another embodiment of the present invention. FIG. 3A is a longitudinal sectional view of the tool positioning member 15, and FIG. 3B is a sectional view taken along line XX of FIG. It is. In the above-described embodiment, the entire positioning main body 5a of the tool positioning member 5 is formed of an elastic body such as hard rubber. In order to improve the strength of the rotary operation hole 12 by avoiding this, there is a possibility that the operation hole 12 is elastically deformed and it becomes difficult to perform the rotation operation, or the operation hole 12 may be damaged due to wear during repeated use. ,
In the embodiment shown in FIG. 3, a tool positioning member 15 comprising a positioning body 15a made of an elastic material such as hard rubber is used.
A reinforcing member 16 made of metal or abrasion-resistant synthetic resin and having a rotation operation hole 12 is integrally provided at the center portion side.

The reinforcing member 16 is formed by cutting a metal columnar material such as a round steel material into a predetermined length and forming a hexagonal hole 12 for rotation operation at the center thereof. It is fitted into the hole 18 provided and is adhesively fixed via an adhesive.

FIG. 4A shows a reinforcing member 26 similar to the above-described reinforcing member 16. A metal prism material such as a square steel material is cut into a predetermined length, and a similar hexagonal hexagonal head for rotating operation is provided at the center thereof. The reinforcing member 26 having the hole 12 formed therein is pressed into a square hole provided in the tool positioning member 15 or fixed via an adhesive. FIG. 4B shows a reinforcing member 36 formed by cutting a metal prism material such as a hexagonal steel material into a predetermined length and forming a hexagonal hole 12 for rotation operation at the center thereof. It is pressed into the hole or fixed via an adhesive.

The tool holder B shown in FIG. 5 has a cylindrical holder main body 1 provided with a chuck 22 at a distal end portion. The inside of the holder main body 1 is screwed with the female screw portion 3 on the inner peripheral surface thereof. A tool positioning member 25 composed of a positioning body 25a made of an elastic material such as hard rubber and having a male screw portion 4 formed on the outer peripheral surface thereof is screwed so as to be movable and adjustable along the central axis O of the holder body 1. .

The chuck 22 includes a chuck cylinder 1a having a tapered outer peripheral surface on the tip end side of the holder body 1, a tightening rotary cylinder 23 externally fitted to the chuck cylinder 1a, and Tightening rotary cylinder 23 and chuck cylinder 1
a of a well-known structure comprising a large number of needle rollers 24 interposed between the chuck cylinder 1a and the chuck cylinder 1a, which is contracted by rotating the tightening rotary cylinder 23, and fitted to the chuck cylinder 1a. The tool 10 is gripped and fixed.

The tool rear end determining member 25 comprises a positioning main body 25a made of an elastic material such as hard rubber similar to the positioning members 5 and 15, and as can be seen from FIGS. 6A and 6B, A male screw portion 4 is formed on the outer peripheral surface, a concave portion 27 for rotating operation is formed in the distal end surface in a diametrical direction, and a through hole 28 is formed in the center portion along the axis. The tool positioning member 25 is also formed such that the effective diameter of the male screw portion 4 formed on the outer peripheral surface is slightly larger than the effective diameter of the positioning member mounting female screw portion 3 formed inside the holder body 1. You.

When the tool 10 is fixed by the tool holder B, the shank 10a of the tool 10 is inserted into the holder body 1 as shown in FIG.
By rotating the tool 10 in this state, the rotary operation convex portion 29 formed at the rear end of the tool 0a is fitted into the rotary operation concave portion 27 of the tool positioning member 25.
The rotation of the tool 10 is transmitted to the tool positioning member 25 through the recess 27 and the tool positioning member 25, and the positioning member 25 is rotated in an arbitrary direction in the forward and reverse directions, and the positioning member 5 is moved along the central axis O of the holder main body 1. adjust.

After the tool positioning member 25 is adjusted to a predetermined position in this manner, the chuck cylinder 1a is contracted by rotating the tightening rotary cylinder 23 of the chuck 22 in the tightening direction, and the tool 10 is gripped and fixed. At this time, the rotating cylinder 2
When the tool 3 is rotated in the tightening direction, the tool 10 is pulled into the holder body 1 via the chuck cylinder 1a.
Is made of an elastic material, when the tool 10 is retracted and retreats, the retraction displacement of the tool 10 is absorbed by the conical recess 11 of the tool end positioning member 25. Therefore, the chuck cylinder 1 holding the shank portion 10a of the tool 10
As a result, the shank portion 10a of the tool 10 is held coaxially with the center axis O of the holder body 1 by the chuck cylinder 1a. Runout is almost eliminated, and cutting accuracy is improved.

According to the above-described tool rear end positioning members 5, 15, 25, the tool positioning members 5, 15, 25 for receiving the rear end of the tool 10 when the tool 10 having the oil hole 10b is used. Since it plays the role of oil-tight packing, oil leakage from the tool positioning members 5, 15, 25 can be prevented.

[0026]

According to the tool positioning member of the first aspect of the present invention, since the positioning body is made of an elastic material such as hard rubber, the tool is positioned at the tip of the tool rear end positioning member at a required position inside the holder body. With the rear end abutting,
When the chuck is tightened, the tool is pulled into the holder body.However, since the positioning body is made of an elastic body as described above, when the tool is retracted and moved backward, the tool is moved backward and backward. Is absorbed by the tool rear end positioning member. Therefore, distortion is not generated in a part of the circumferential direction on the chuck side where the tool is gripped, so that the tool is held and fixed by the chuck coaxially with the center axis of the holder body. As a result, when the tool is used, the runout of the tool is almost eliminated, and the cutting accuracy can be improved.

Furthermore, when the tool 10 with an oil hole is used, the tool positioning body that receives the rear end of the tool serves as an oil-tight packing, so that oil leakage from the tool positioning body can be prevented. .

According to a second aspect of the present invention, the effective diameter of the male screw portion formed on the outer periphery of the positioning body of the tool positioning member is slightly smaller than the effective diameter of the positioning member mounting female screw portion formed inside the holder body. If it is large, this male screw part is appropriately reduced in diameter by elastic deformation, or it is screwed into a female screw part that is slightly tight so that it is elastically deformed at the time of screwing, so that the tool due to vibration during cutting processing etc. In addition to preventing the positioning member from loosening, for example, when cutting oil is circulated inside the holder body and supplied to the tool cutting edge through a supply hole provided in the tool, a threaded portion between the tool positioning member and the holder body 1 Ensure that cutting oil is reliably supplied to the tool edge through the oil passage from the shank rear end of the positioning body and the tool pressed against it without causing oil leakage from the boundary of the tool. Can.

According to a third aspect of the present invention, when a reinforcing member having a rotary operation hole is integrally provided on the center side of the positioning main body of the tool positioning member, a rotary operation such as a driver is provided in the rotary operation hole. When the tool is engaged and rotated, the operation hole is not deformed, and the tool positioning member can be rotated reliably and easily for a long period of time.

According to the tool holder of the fourth aspect of the present invention, when the chuck is tightened with the rear end of the tool in contact with the front end of the tool rear end positioning member at a required position inside the holder main body, The tool is retracted into the holder body.However, since the tool rear end positioning member is made of an elastic material, when the tool is retracted and retreats, the tool retraction displacement is compensated by the tool rear end positioning member. Will be absorbed. Therefore, distortion is not generated in a part of the circumferential direction on the chuck side where the tool is gripped, so that the tool is held and fixed by the chuck coaxially with the center axis of the holder body. The tool runout is almost eliminated when using the tool,
It is possible to improve the cutting accuracy, and by adding the configuration according to claim 2 or 3 to the tool positioning member, the tool positioning member is loosened in the holder main body even when used for a long time. It is possible to easily and reliably perform the rotation operation of the positioning member for a long period of time without causing a position shift.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a main part of a tool holder according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 shows a tool rear end positioning member according to another embodiment, (A) is a longitudinal sectional view of the tool rear end positioning member,
(B) is a sectional view taken along line XX of (A).

FIGS. 4A and 4B are cross-sectional views of a tool rear end positioning member according to another embodiment.

FIG. 5 is a longitudinal sectional view of a main part of a tool holder according to another embodiment.

6A is a plan view of a tool rear end positioning member attached to the tool holder of FIG. 5, and FIG. 6B is a longitudinal sectional view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Holder main body 2 Collet chuck 3 Female screw part 4 Male screw part 5, 15, 25 Tool positioning member 5a, 15a, 25a Positioning main body 7 Collet 10 Tool 10a Shank part 10b Oil hole 12 Rotation operation hole 16, 26, 36 Reinforcement member

Claims (4)

[Claims] 1. A tool positioning member provided inside a holder body provided with a chuck for fixing a tool, and abutting against a rear end of the tool to position the tool at a predetermined position in the holder body. A tool positioning member in a tool holder in which a positioning body made of an elastic body such as hard rubber is screwed so as to be movable and adjustable along a central axis of the holder body. 2. The effective diameter of a male screw portion formed on the outer periphery of the positioning main body is slightly larger than the effective diameter of a positioning member mounting female screw portion formed inside the holder main body. Tool positioning member in the tool holder. 3. The positioning member according to claim 1, wherein a reinforcing member having a rotation operation hole is integrally provided at a center portion side of the positioning body.
3. A tool positioning member in the tool holder according to claim 1. 4. A tool holder comprising the tool positioning member according to claim 1 inside a holder body provided with a chuck for fixing a tool.