JPH05177417A - Chucking jig - Google Patents

Abstract

PURPOSE:To chuck a work without causing a deviation in the work by supporting the work by a support shaft and thrusting the work onto a thrusting part. CONSTITUTION:A thrusting part 11 is formed of a cylinder part 15 in which a fluid is sealed and a plurality of pistons 16 reciprocating in the axial direction of a support shaft 12 by the fluid pressure which are provided on the cylinder part 15, so that a work W is thrust onto the top end parts of the pistons 16. When the work W is supported by the support shaft 12 and thrust onto the top end parts of the pistons 16, the pistons 16 are protruded and retreated along the thrust surface of the work W and trust thereto. Since the work W is thus chucked with its axial line being conformed with the axial line of the support shaft 12, the work W is never deviated when rotated together with the chucking jig, and a precise working such as recessing to the outer circumferential surface of the work can be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chucking jig used for chucking a work to be cut by a lathe or the like.

[0002]

2. Description of the Related Art For example, when forming a groove M along the circumferential direction on the outer peripheral surface of a work W as shown in FIG. 6, the inner diameter portion of the work W is held by a collet chuck 1 which can be expanded in the radial direction. At the same time, the end surface of the work W is abutted against the abutting portion 3 formed along the circumferential direction at the end surface opening of the cylindrical body 2 provided on the outside of the collet chuck 1 with the axis aligned with the collet chuck 1. A chucking jig mainly composed of the collet chuck 1 and the cylindrical body 2 is attached to a lathe, and the workpiece W is rotated by rotating the chucking jig on the outer peripheral surface of the workpiece W using a cutting tool or the like. It is performed by cutting.

[0003]

However, in the above chucking jig, when the end surface of the workpiece W which is abutted against the abutting portion 3 is slightly inclined with respect to the axis, the workpiece W is
When the workpiece W is abutted against the abutting portion 3, the workpiece W is inclined so as to intersect the axis of the collet chuck 1. Therefore, when the workpiece W is rotated, the workpiece W is shaken, which is accurate. There is a drawback that it is not possible to process various grooves.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a chucking jig capable of abutting a workpiece against an abutting portion and chucking the workpiece without causing deflection. The purpose is to do.

[0005]

In order to achieve the above object, a chucking jig according to claim 1 of the present invention is provided with an abutting portion, a cylinder portion in which a fluid is sealed, and the cylinder portion. And a plurality of pistons that reciprocate in the axial direction of the support shaft that supports the inner diameter of the work by fluid pressure, and the work is made to abut the tip of these pistons.

According to a second aspect of the present invention, there is provided a chucking jig, wherein the abutting portion is a flexible tube in which a fluid is enclosed.
This tube is composed of a plate whose one end surface is in contact with the tube, and the other end surface of the plate is made to abut a work whose inner diameter is supported by a support shaft.

[0007]

In the chucking jig of the first aspect, when the work is supported by the support shaft and abutted against the tip of the piston, the piston moves forward and backward along the abutting surface of the work to abut. The work is chucked with its axis aligned with the axis of the support shaft.

In the chucking jig of claim 2,
When the work is supported by the support shaft and abutted against the multi-end face of the plate, the plate swings along the abutting face of the work, and the work is chucked with its axis aligned with the axis of the support shaft. ..

[0009]

1 to 3 show a first embodiment of a chucking jig of the present invention. In these drawings, reference numeral 10 indicates a jig body. The jig body 10 has a disk shape, and a recess 10a is formed on the right end surface thereof. The jig body 10 is provided at the center of the bottom surface of the recess 10a.
Has a through hole 10b opened to the left end face thereof. A disk-shaped abutting portion 11 is fitted and fixed in the recess 10a. A through hole 11 a extending in the axial direction of the abutting portion 11 is formed in the center of the abutting portion 11. The through hole 1 a
The axis 1a is aligned with the through hole 10b.

Further, a collet chuck (support shaft) 12 is inserted into the through hole 10b of the jig body 10 and the through hole 11a of the abutting portion 11, and the tip end thereof is projected from the right end surface of the abutting portion 11. ing. This collet chuck 12
As shown in FIG. 1 and FIG. 3, is composed of a fixed collet shaft 13 having a tapered tip, and a collet 14 slidably provided outside the fixed collet shaft 13. .. A plurality of notches 14a extending in the axial direction are formed at equal intervals in the circumferential direction at the tip of the collet 14, and the claws 14b between the notches 14a, 14a adjacent to each other are formed on the tapered surface of the collet 14. It is slidably engaged. The claws 14b are opened outward in the radial direction of the collet 14 by pulling the collet 14 to the left, and are pressed against the inner peripheral surface of the work W to hold the work W. A cylinder portion 15 is formed inside the abutting portion 11. The cylinder portion 15 is a chamber having a quadrangular cross section, which is formed in an annular shape along the circumferential direction outside the through hole 11a, and is filled with oil from a supply port (not shown) and sealed therein.

The cylinder portion 15 has six pistons 1
6 are provided so as to be able to reciprocate in the axial direction of the collet chuck 12 (left and right direction in FIG. 1), and these pistons 16 are arranged at equal intervals around the through hole 11a as shown in FIG. There is. The left end surface A of the work W contacts the tip of the piston 16 when the work W is held by the collet chuck 12.

In the chucking jig configured as described above, when the left end surface A of the work W is inclined with respect to the axis and the distance from the right end surface of the abutting portion 11 is different, When W is held by the collet chuck 12 and pulled in to the left, a pressure acts on the oil in the cylinder portion 15 from the piston 16 that first contacts the left end surface A of the work W, and this pressure is changed by Pascal's principle. Of the pistons 16 ... Are advanced toward the left end surface A, and the pistons 16 are brought into contact with the left end surface A one after another. As a result, the work W is chucked with its axis aligned with the axis of the collet chuck 12, so that when the work W is rotated together with the chucking jig, the work W does not fluctuate. It is possible to perform accurate machining such as grooving on the outer peripheral surface of the work W.

FIGS. 4 and 5 show a second embodiment of the chucking jig of the present invention. In these drawings, reference numeral 20 indicates a jig body. The jig main body 20 has a cylindrical shape, and a disk-shaped side plate 21 is fixed to the right end surface of the jig main body 20 with bolts 22. A through hole 21a is formed in the center of the side plate 21 so that the diameter thereof gradually decreases toward the right side. An annular groove 23 is formed around the through hole 21a on the right end surface of the side plate 21. There is.
An annular tube 24, which has flexibility and is filled with oil, is inserted into the groove 23. The right half of the tube 24 projects from the groove 23, and the plate 25 is in contact with the projecting portion. The plate 25 has a disk shape, and its outer peripheral portion is attached to the side plate 21 by three bolts 26.

The plate 25 can swing around the center O as a fulcrum when the oil in the tube 24 moves in the tube, but since the internal pressure in the tube 24 is the same in all parts due to the principle of Pascal, the plate 25 Is supported by the tube 24 with equal force even when it is swung. The tube 24 and the plate 25 constitute an abutting portion 27, and a work (not shown) is abutted against the right end surface of the plate 25. A through hole 25a having a diameter gradually decreasing toward the right is provided in the center of the plate 25.
It is formed to match a. These through holes 21a,
A collet chuck (not shown) similar to that of the first embodiment is inserted into 25a to hold the work in a state of abutting against the right end surface of the plate 25.

In the chucking jig configured as described above, when the left end surface of the work is inclined with respect to the axis, when the work is held by the collet chuck and pulled in to the left, the left end surface of the work The plate 25 comes into contact with the plate 25. Since the plate 25 is swingable, the plate 25 swings and tilts along the tilting direction of the work, so that the work is chucked with its axis aligned with the axis of the collet chuck. Therefore, when the work is rotated together with the chucking jig, the work is not shaken, and thus accurate machining such as grooving can be performed on the outer peripheral surface of the work.

[0016]

As described above, according to the chucking jig of the first aspect of the present invention, the abutting portion against which the work is abutted is provided in the cylinder portion in which the fluid is sealed and in this cylinder portion. It is composed of a plurality of pistons that are reciprocated in the axial direction of the support shaft that is supported by fluid pressure and supports the work, and the work is made to abut the tip of these pistons. When it hits the tip of the workpiece, the piston advances and retreats along the abutting surface of the workpiece, causing the workpiece to be chucked with its axis aligned with the axis of the support shaft. When the workpiece is rotated together with the jig, the workpiece does not shake, so that it is possible to perform accurate machining such as grooving on the outer peripheral surface of the workpiece.

Further, according to the chucking jig of the second aspect, the abutting portion is composed of a flexible tube in which a fluid is sealed and a plate whose one end surface is in contact with the tube. Since the work is abutted against the other end surface of this plate, when the work is supported by the support shaft and abutted against the multi-end surface of the plate, the plate swings along the abutment surface of the work, so that the work is Since the axis is aligned with the axis of the support shaft and chucked, there is no wobbling on the work when the work is rotated together with the chucking jig. Processing such as groove processing can be performed.

[Brief description of drawings]

FIG. 1 is a sectional view of a chucking jig according to a first embodiment of the present invention.

FIG. 2 is a BB line view in FIG.

FIG. 3 is a sectional view of a main part of a collet chuck.

FIG. 4 is a sectional view of a chucking jig according to a second embodiment of the present invention.

5 is a view taken along line CC in FIG.

FIG. 6 is a sectional view of a conventional chucking jig.

[Explanation of reference numerals] 11 abutting part 12 collet chuck (supporting shaft) 15 cylinder part 16 piston 24 tube 25 plate 27 abutting part W work

Claims (2)

[Claims] 1. A chucking jig including a support shaft that is inserted into an inner diameter portion of a work to support the work, and an abutment portion against which the work abuts. A fluid is enclosed in the abutment portion. And a plurality of pistons provided in the cylinder portion that reciprocate in the axial direction of the support shaft by fluid pressure, and the work is abutted against the tip end of these pistons. Characteristic chucking jig. 2. A chucking jig including a support shaft that is inserted into an inner diameter portion of a work to support the work, and an abutment portion against which the work abuts. A fluid is enclosed in the abutment portion. A chucking jig comprising a flexible tube and a plate whose one end surface is in contact with the tube, and the work is abutted against the other end surface of the plate.