JPH09174313A - Foreign matter removing device and foreign matter removing method of inside diameter gripping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove a foreign matter such as chips sticking to and remaining in a prescribed part between a cylindrical work and a collet by automatic discharge of high pressure air after work finishes. SOLUTION: A foreign matter removing device and a foreign matter removing method of an inside diameter gripping device are composed of an air flowing hole 4a formed in a collet pulling member 4, an air storage part A which is arranged inside a collet 7 and is always communicated with the air flowing hole 4a, an air supply means to always supply constant pressure air to the air storage part A through the air flowing hole 4a and a selaing means 10 which prevents air in the air storage part A from being discharged by sealing a part between the collet 7 and a cylindrical work W when a collet pulling member 4 holds the cylindrical work W by pulling the collet 7 by moving to the other side and releases sealing when the collet pulling member 4 releass a pull of the collet 7 by moving to one side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner diameter gripping device that presses an inner peripheral surface of a cylindrical work with a collet to perform a predetermined processing, and a gap is formed between the cylindrical work and the collet during the processing. The present invention relates to a foreign matter removing device and a foreign matter removing method capable of preventing foreign matter such as powder from entering and automatically removing high-pressure air to remove foreign matter remaining in the vicinity of a cylindrical work.

[0002]

2. Description of the Related Art In order to machine the outer peripheral surface of a cylindrical work such as a cylinder sleeve, the cylindrical work is fitted onto a collet, and the collet pulling member is used to open and close the collet at both ends in the radial direction. There is known an inner diameter gripping device that grips the cylindrical work by pressing against the inner peripheral surface of the cylindrical work. By the way, in such an inner diameter gripping device, foreign matter such as chips generated by machining easily enters between the collet and the cylindrical work (boundary portion), and such foreign matter is generated between the collet and the cylindrical work. If the tubular work is pulled out from the collet while it is interposed, the inner peripheral surface of the tubular work may be damaged and the product may become defective. Further, if foreign matter enters the inside of the collet, especially the slit portion of the collet, the collet cannot be opened and closed smoothly, which makes it difficult to quickly attach and detach the cylindrical work. Therefore, the operator frequently inspects the inner diameter gripping device, and when foreign matter remains, it is necessary to blow high-pressure compressed air with an air gun or the like to remove the foreign matter.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and prevents foreign matter such as chips from entering between the cylindrical work and the collet. By automatically releasing air, the foreign matter remaining in the specified area can be removed so that the inner peripheral surface is not scratched when the cylindrical work is attached or detached, and the foreign matter invades the collet. An object of the present invention is to provide a foreign matter removing device and a foreign matter removing method that do not hinder a smooth opening / closing operation.

[0004]

In order to achieve the above object, the foreign matter removing device of the present invention is a collet tension member provided on a work supporting member so as to be movable back and forth, and externally fitted on the work supporting member. And a collet opening / closing member that is fitted to one end of the collet tension member and is engaged with the collet to move the collet forward and backward with the movement of the collet tension member to open and close the end of the collet. Provided in an inner diameter gripping device that grips and supports the inner diameter portion of the cylindrical work fitted onto the collet, and removes foreign substances present between the collet and the cylindrical work after processing the cylindrical work. In the foreign matter removing device for, an air circulation hole formed in the collet tension member,
An air reservoir provided inside the collet, which is in constant communication with the air circulation hole, an air supply means for constantly supplying air of a constant pressure to the air reservoir through the air circulation hole, and the collet tension member. While moving to the other side and pulling the collet to grip the tubular work, the gap between the collet and the tubular work is sealed to prevent the air in the air reservoir from being released. The collet pulling member is moved to one side to release the sealing when the pulling of the collet is released. The sealing means is provided on the collet opening / closing part, which is formed on the work supporting member and which abuts the other end of the cylindrical work fitted on the collet over the entire circumference, and the collet opening / closing part. When the member moves to the other side, the member is fitted into the cylindrical work, and is elastically deformed by being pressed against one end of the collet, and a sealing member that is in close contact with the inner peripheral surface of the cylindrical work. You may.

Further, according to the foreign matter removing method of the present invention, the collet tension member provided on the work support member so as to be movable back and forth, the collet externally fitted to the collet tension member, and the collet tension member fitted to one end portion thereof. And a collet opening / closing portion that engages with the collet to move the collet forward and backward with the movement of the collet tension member to open and close the end of the collet, and grips the inner diameter portion of the cylindrical work fitted onto the collet. In the foreign matter removing method of the inner diameter gripping device for supporting by supporting, the air is constantly supplied to the air reservoir between the collet and the cylindrical work on which the cylindrical work is fitted,
When the collet pulling member pulls and grips the collet, the collet pulling operation of the collet pulling member seals between the collet and the cylindrical work and stores air of a constant pressure in the air storing portion, When the collet tension member moves to one side to release the pull of the collet after the processing of the cylindrical work is completed, the sealing of a predetermined portion is released, and the collet and the cylindrical work generated in the predetermined portion. It is characterized in that the high-pressure air in the air reservoir is instantly discharged from the gap.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view illustrating an entire configuration of a foreign matter removing device according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a main part illustrating an operation of the present invention. In the following description, the word "front" refers to the right side of the drawing,
The term "rear" refers to the left side of the drawing.

[Description of Configuration of Inner Diameter Gripping Device] Reference numeral 2 is a work supporting member, which is attached to the device body 1 fixed to a table or the like of a machine tool. The inner diameter of the cylindrical work W is gripped by the work support member 2 and the outer peripheral surface of the work W is subjected to predetermined processing by a machine tool or the like. Work support member 2
A cylinder 3 is provided behind (on the left side of the drawing), and a collet tension member 4 is provided so as to be movable forward and backward through the centers of the cylinder 3 and the work support member 2. Collet tension member 4 located in cylinder 3
A piston 5 is integrally formed at a midway portion thereof and is fitted into a cylinder chamber 3a provided in the cylinder 3 so as to be movable back and forth. Pressure oil supply ports 6a and 6b are opened in the front and rear portions of the cylinder chamber 3a, and by the action of a pressure oil supply device such as a pump and a switching valve (not shown), the pressure oil supply ports 6a and 6b are connected to the cylinder chamber 3a. Pressure oil can be supplied or drained therein to advance or retract the collet tension member 4.

A known collet 7 is externally fitted to the front end of the work supporting member 2. This collet 7 has a plurality of slit portions 7a formed at equal intervals in the circumferential direction at both front and rear ends, and both ends of the collet 7 are expanded and contracted by radially expanding and contracting the both end portions having the slit portions 7a. The portion can be pressed against the inner peripheral surface of the cylindrical work W to grip the cylindrical work W. As shown in the drawing, on the inner peripheral surfaces on both ends of the collet 7, inclined taper portions 7b, 7b are provided.
Is formed, and the taper portion 7b on the rear side is engaged with the taper portion 2b formed on the work supporting member 2. The collet tension member 4 is provided at the front end of the collet tension member 4.
A collet opening / closing member 8 for pulling and opening / closing the collet 3 by the forward / backward movement is attached. The collet opening / closing member 8 includes a taper portion 7b on the front end side of the collet 7.
A ring-shaped member 8b having a tapered portion 8a that engages with the front end of the collet tension member 4 and a locking member 8c screwed to the threaded portion 4d at the front end of the collet tension member 4; It is composed of a cap member 8d which is fitted to the stopper member 8c and attached to the ring-shaped member 8b with a bolt.

Inside the collet 7, there is formed a spring receiving portion 7c which is provided so as to project in the radial direction. A compression coil spring 11 (hereinafter referred to as spring 11) fitted to the front end of the work supporting member 2 is interposed between the ring-shaped member 8b and the spring receiving portion 7c. When the collet tension member 4 retracts, the rear end of the ring-shaped member 8b causes the spring 11 to come into contact with the spring receiving portion 7c and pushes it toward the rear side.
Is biased rearward by the spring 11. Therefore, the collet 7 has a taper portion 8a and a taper portion 7b on the front end side.
The rear end side is tapered by the engagement with the tapered portion 7b and the tapered portion 2b.
The inner peripheral surface of the cylindrical work W is gripped by being expanded by the engagement with.

[Explanation of Configuration of Air Circulation Hole and Air Reservoir]
As shown in the figure, the space between the collet 7 in which the spring 11 is fitted and the work supporting member 2 is formed as an air reservoir A for storing air. The collet tension member 4 has an air flow hole 4a formed in the axial center thereof.
The air circulation hole 4 is formed on the outer peripheral surface of the front end of the collet tension member 4.
Holes 4b, 4b communicating with a are formed. Further, the work supporting member 2 is formed with through holes 9, 9 corresponding to the holes 4b, 4b and communicating with the through hole 2a. Wide grooves 9a and 9a are formed on the inner peripheral surface of the through hole 2a so that the communication state between the holes 4b and 4b and the through holes 9 and 9 can always be maintained even if the collet tension member 4 moves back and forth. Has been done. The through holes 9 and 9 are opened to the air storage portion A, and the high-pressure compressed air flowing through the air circulation hole 4a of the collet tension member 4 passes through the holes 4b and 4b and the through holes 9 and 9 and the air storage portion A. Is supplied to.

[Structure of Sealing Means] Next, the structure of the sealing means for preventing the air in the air reservoir A from leaking to the outside while gripping the cylindrical work W will be described. The sealing means seals the space between the collet 7 and the cylindrical work W while the collet pulling member 4 retracts to pull the collet 7 to grip the cylindrical work W, so that the air in the air reservoir A is Leakage can be prevented, and a gap S is formed between the collet 7 and the cylindrical work W when the collet tension member 4 moves forward to release the tension of the collet 7, and the air reservoir is formed from the gap S. It must be able to release the air in A. The sealing means in this embodiment has the following configuration. A work contact portion 2c is formed at a portion of the support member 2 with which the rear end portion Wa of the cylindrical work W abuts. The work contact portion 2c is configured such that the cylindrical work W is always attached to the work support member 2 in a constant state by the rear end portion Wa abutting uniformly over the entire circumference. 2c and the rear end portion Wa of the cylindrical work W are eliminated to eliminate air gap 4
The high pressure compressed air supplied from a is not discharged from between the cylindrical work W and the collet 7.

An attaching groove 10a for the O-ring 10 is formed on the entire outer circumference of the cap member 8d constituting the collet opening / closing member 8. The attaching groove 10a is a sealing member made of an elastic material such as rubber. An O-ring 10 having a circular cross section is fitted. The O-ring 10 fitted in the mounting groove 10a has an outer diameter substantially the same as the inner diameter of the tubular work W, and is in a non-grasping state of the tubular work W, that is, when the collet tension member 4 is advanced, The work W has escaped from the cylindrical work W, and a gap is formed between the cylindrical work W, which is a predetermined portion, and the O-ring 8. However, when the cylindrical work W is gripped, that is, the collet tension member 4 is In the retracted state, it is fitted into the cylindrical work W and comes into close contact with the inner peripheral surface of the cylindrical work W by elastic deformation. The above-mentioned work contact portion 2c and the O-ring 10 constitute a sealing means for sealing the air in the air storage portion A so as not to be discharged. The sealing member may be the above-mentioned O-ring 10 as long as it is elastically deformable and can be brought into close contact with the inner peripheral surface of the cylindrical work W.
However, other sealing members may be used. For example, a urethane seal or packing having a square cross section may be used.

Next, the foreign matter removing method of the present invention will be described together with the operation of the foreign matter removing apparatus having the above-mentioned configuration. [Air Supply Process] High-pressure compressed air supplied from a compressor or the like (not shown) is constantly supplied to the air reservoir A through the air circulation hole 4a. In the state where the cylindrical work W is not mounted, the collet tension member 2 is at the most advanced position, and the air is discharged from the slit portion 7a of the collet 7 into the outside air. When the tubular work W is externally fitted to the collet 7, the air flow is generated along the inner peripheral surface of the tubular work W as shown in FIG.
It flows as indicated by the middle arrow and is discharged into the outside air from the gap between the collet 7 and the cylindrical work W. At this time, if there is a gap between the work contact portion 2c and the rear end portion Wa of the cylindrical work W, the air passes between the rear end portion Wa and the work contact portion 2c and is exposed to the outside air. Is released to.

[Air Sealing and Reserving Process] When the cylindrical work W is pushed until the rear end portion Wa contacts the work contact portion 2c, pressure oil is supplied to the cylinder chamber 3a to retract the collet tension member 4. , Both ends of the collet 7 are cylindrical work W
The cylindrical work W is gripped by being pressed against the inner peripheral surface of the.
At this time, the O-ring 10 is fitted into the cylindrical work W as the collet tension member 4 retracts, and is pressed against the front end of the collet 7 to elastically deform. Since the O-ring 10 is deformed in the radial direction, the outer peripheral edge of the O-ring 10 is firmly pressed against the inner peripheral surface of the cylindrical work W, and the collet 2 and the cylindrical work W
Seal the gap between the inner surface of the and. Since the other rear end portion Wa of the cylindrical work W is in contact with the work contact portion 2c and is sealed, the high pressure compressed air supplied from the air circulation hole 4a cannot escape to the outside air, and the air storage It will be stored in Part A. Further, since the front and rear ends of the cylindrical work W are completely sealed by the sealing means in this manner, foreign matter such as chips enter the space between the collet 7 and the cylindrical work W even during the processing of the cylindrical work W. There is nothing to do.

[Air Ejecting Step] When the collet tension member 4 is moved forward to release the tension of the collet 2 after the predetermined processing is performed, the O-ring 10 is deformed by the forward movement of the collet tension member 4. With the return to
The O-ring 10 escapes from the cylindrical work W, and a gap S is formed between the collet 7 and the front end of the cylindrical work W. The air stored under high pressure in the air storage portion A is discharged into the outside air at a high speed through the gap S, and therefore is firmly attached between the collet 7 and the cylindrical work W by oil or the like. The foreign matter T such as chips can also be reliably removed. Since the air is discharged from the inside of the collet 7 to the outside, it is possible to prevent the foreign matter T from entering the collet 7.

Although the preferred embodiment of the present invention has been described, the present invention is not limited to the above embodiment. For example, in the above embodiment, the gap S is simultaneously formed over the entire circumference between the front end of the cylindrical work W and the collet 7 by the forward movement of the collet tension member 4.
The air in the air storage portion A is discharged radially from the gap S, but the gap S is first generated at a predetermined portion by partially increasing the thickness of the O-ring 10 or partially making it double. Thus, the high pressure compressed air can be intensively discharged from the gap S of the predetermined portion to enhance the foreign substance removing effect.

[0017]

Since the present invention is constructed as described above, it has the following effects. Even during processing of the cylindrical work, foreign matter such as chips does not enter between the cylindrical work and the collet. In addition, when the collet is used to release the cylindrical work, even if foreign matter such as chips remains near the cylindrical work, a gap is created in that area and high-pressure air is instantly released from this gap. By doing so, the foreign matter at the site can be completely removed. in this way,
According to the present invention, it is possible to prevent foreign matter from entering during processing and to automatically remove foreign matter remaining in the vicinity of the cylindrical work by discharging high-pressure compressed air.
Not only can product damage and collet operation failure due to the inclusion of foreign matter be prevented, but the work of removing foreign matter with an air gun etc. is not required, which contributes to reducing the work burden on workers and shortening the working time. You can

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a foreign matter removing device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part for explaining the flow of air after releasing the grip according to the embodiment of the present invention.

[Explanation of Codes] W Cylindrical Work Wa Wa Rear End A Air Reservoir T Foreign Material S Gap 1 Device Main Body 2 Work Support Member 2a Through Hole 2b Tapered Part 2c Work Contact Part 3 Cylinder 4 Collet Tension Member 4a Air Circulation Hole 5 Pistons 6a, 6b Pressure oil supply port 7 Collet 7a Slotted portion 7b Tapered portion 7c Convex portion 8 Collet opening / closing member 8a Tapered portion 8b Ring-shaped member 8c Locking member 8d Cap 9 Through hole 9a Groove 10 O-ring (sealing member) 10a Mounting groove 11 Spring

Claims (3)

[Claims] 1. A collet tension member provided on a work support member so as to be movable back and forth, a collet externally fitted on the work support member, and fitted to one end of the collet tension member to engage with the collet. And a collet opening / closing member that moves the collet forward and backward with the movement of the collet tension member to open and close the end of the collet, and grips and supports the inner diameter portion of the cylindrical work fitted onto the collet. In the foreign matter removing device provided in the apparatus for removing foreign matter existing between the collet and the cylindrical work after the processing of the cylindrical work, an air circulation hole formed in the collet tension member, An air reservoir provided inside the collet, which is always in communication with the air circulation hole, and a constant pressure air are constantly supplied to the air reservoir through the air circulation hole. Air supply means for supplying the collet and the collet tension member moves to the other side to pull the collet to grip the tubular work, and seals between the collet and the tubular work to provide the air. The air in the reservoir is prevented from leaking, and the seal is released to release the air in the air reservoir when the collet tension member moves to one side to release the pull of the collet. A foreign matter removing device for an inner diameter gripping device, comprising: a sealing means. 2. The sealing means is provided on the collet opening / closing part, which is formed on the work supporting member and which is in contact with the other end of the cylindrical work fitted on the collet over the entire circumference thereof. And the collet tension member is fitted into the cylindrical work when the collet tension member moves to the other side, and is elastically deformed by being pressed against one end of the collet, and is closely attached to the inner peripheral surface of the cylindrical work. The foreign matter removing device of the inner diameter gripping device according to claim 1, comprising: a stop member. 3. A collet tension member provided on a work support member so as to be movable back and forth, a collet externally fitted to the collet tension member, and fitted to one end of the collet tension member to engage with the collet. A collet opening / closing portion that opens and closes the end of the collet by moving the collet forward and backward with the movement of the collet tension member, and foreign matter of an inner diameter gripping device that grips and supports the inner diameter portion of the cylindrical work fitted onto the collet. In the removal method, the air is constantly supplied to the air reservoir between the collet and the cylindrical work fitted on the tubular work, and the collet tension member pulls the collet to grip the collet. When the collet pulling operation of the member is performed, the space between the collet and the cylindrical work is hermetically sealed, and air having a constant pressure is stored in the air storage portion. When the collet tension member moves to one side to release the pull of the collet after the processing of the work piece is completed, the gap between the collet and the cylindrical work piece generated at the predetermined portion is released by releasing the sealing of the predetermined portion. The high-pressure air in the air reservoir is instantaneously released from the air retention unit.