JPS5942207A - Expanding type collet chuck - Google Patents

Abstract

PURPOSE:To improve safety and machining accuracy by attaching closely the article to be machined to a standard plane, while expanding a collet to chuck the article to be machined. CONSTITUTION:A collet arbor 11 is caused to retreat toward right direction, after the article to be machined is fitted and set on the outer circumference of a collet 20. Because each taper parts 16, 19 tend to approach mutually, the approach mutually, the collect acts and the article w to be machined is temporarily chucked. The collet 20 retreats with the collet arbor 11 and an arbor nozzle 15, while it is sliding in rellation to the article to be machined. The tensile strength acting on the collet arbor 11 affects only in the direction to expand the collet 20, whereby main chuck may be achieved at the condition where the article W to be machined is in contact closely with a standard plane 13.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an expanded type cholera 1 chuck of a type that chucks a workpiece by expanding a collet.

Conventionally, a chuck for such a scale constructed as shown in FIG. 1 is known. The Cholera 1 chuck shown in FIG.
Pass through the center of the reference block 3 so that its tip protrudes forward of the reference plane 2, fix it to the main body 1 with a neck l-5, and insert it into the cholera 1 along the center line of 4. By retracting the operating shafts, that is, the cholera 1 to arbor 6, using a hydraulic cylinder (not shown) through the drawer tube 7, the taper part 8 formed at the tip of the collet boober 6 allows the cholera l-4 to be moved to a radius. It is intended to chuck the workpiece W which has been expanded in the direction and, as a result, fitted into the cholera 1-4. In addition, the reference numeral 9 in FIG. 1 is a bolt for preventing the rotation of the Koretsu l-booba 6.

However, in order to reliably chuck the workpiece W, it is necessary to chuck the workpiece W in close contact with the reference surface 2. However, in the conventional apparatus described above, the collet 4
Since there is no hoeing ability to move the workpiece W toward the reference surface 2 and bring it into close contact with the reference surface 2, the workpiece W simply expands.
If only one machine is connected to the cholera 1-11, it is not possible to move the workpiece ~① to the reference surface 2 by avoiding the M2R. Therefore, in the past, the workpiece W was pressed against the reference surface 2 manually or with an appropriate device, and the jisek tightening was performed while maintaining this state. When doing this, there are problems such as not only placing an excessive burden on the creator, but also lowering the operating rate, and chuck accuracy having a negative effect on processing accuracy. When such a device is used, there are problems such as an increase in installation costs and the need to take up a large amount of space.

This invention was made in view of the above circumstances, and an object of the present invention is to provide an expandable collet chuck that can expand a collet to chuck a workpiece and simultaneously bring the workpiece into close contact with a reference surface. Its features are that the operating shaft that can move backward protrudes forward from the reference surface where the workpiece is to be tightly packed, and the tip of the sleeve protrudes from the reference surface. is fitted into the middle part of the operating shaft so as to be movable back and forth, and a collet is installed between the tip of the operating shaft and the tip of the chuck auxiliary sleeve, and the collet is fitted between the tip of the operating shaft and the chuck auxiliary sleeve. A tapered part is formed on at least one side of the distal end portion to expand the J: Ricore 1~ in the radial direction by bringing these two closer together, and the sleeve is further pressed toward the distal end side on the y4 CM side of the chuck auxiliary sleeve. The point is that an elastic member is provided to

An embodiment of the present invention will be described below with reference to FIG.

FIG. 2 is a sectional view showing an embodiment of this explanation, and the main body 10 is operated by +N+-! J Colette Booba 11
A reference block 14 having a front surface serving as a reference surface 13 is attached to the tip of the main body 10, which is formed hollow so that a drawbar tube 12 connected to the rear end thereof can be pushed through. The reference block 14, as shown in FIG. It is inserted into the reference block 14 and the body 10 so as to project.

In addition, a chuck auxiliary sleeve, that is, a booba nose 1, is fitted into the middle part of the collet booba 11 so as to be movable back and forth.
5 is accommodated in the reference block 14. The tip of the bouba nose 15 is a tapered portion 16 with a smaller diameter on the tip side, and a flange portion 17 having an outer diameter that is approximately the same as the inner diameter of the reference block 14 is formed in the middle of the booba nose 15. A spring 18 that presses the bouba nose 15 forward is arranged between the flange portion 17 and the main body 10, so that the bouba nose 15 is pushed by the spring 1B and the flange portion 17 of the bouba nose 15 is pushed forward.
contacts the inner wall surface on the distal end side of the reference block 14, and the tapered portion 16 projects forward from the reference surface 13.

Further, the tip of the cholera 1-arbor 11 is a tapered portion 19 having a larger diameter on the tip side, which is opposite to the tapered portion 1G, and each tapered portion 16.
Cholera 1-20 was installed between 19 and 20. The surface of the collet 20 in contact with the tapered portions 16.19 is formed into a tapered shape corresponding to each tapered portion 16.19.

Therefore, by retracting the cholera 1-arbor 11, the above-mentioned expanded cholera 1 to
6.19 approaches, and as a result, '31/21-20 are pushed radially outward and expanded S.

Although not specifically shown in the drawings, chuck and chuck t't'g removal of the workpiece W is performed by moving the collect boober '11 back and forth from the hydraulic cylinder 5 via the drawbar tube 12, and The hydraulic cylinder is operated by switching the nX Pxi valve by operating a switch.

Next, we will explain the operation for picking up the workpiece W. When the collet boober 11 is pushed forward by the drawer tube 12, the collet 20 will move by itself because the distance between the tapered parts 16 and 19 is widened. The workpiece W is contracted to reduce its outer diameter due to the elastic force of J:, and in this state, the workpiece W is inserted into the outer periphery of the collet 20. In that case, by setting the outer diameter of the cholera 1-20 to be almost the same as the inner diameter of the hole formed in the workpiece W,
is pushed into the collet 20 for a tight fit.

Further, the workpiece W may not be brought into close contact with the reference surface 13, but may be separated from the reference surface 13 by a dimension β2 smaller than the retractable dimension β1 of the bouba nose 15.

After placing the workpiece W into the cera 1 as described above, if the hydraulic cylinder is operated by the switch operation and the cholera 1 hair bar 11 is moved backward to the right in FIG. 2, each taper portion 16, 19 approaches As a result, the workpiece W is temporarily chucked, and at the same time, the collet boober 11, booba nose 15, and collet 20 release the spring 18 while temporarily chucking the workpiece W. It retreats against the elastic force. In this way, the workpiece W is temporarily chucked by the collet 20 and retreats until it comes into close contact with the reference surface 13. From then on, the collet 20 moves the workpiece W until the flange part 17 of the bouba nose 15 comes into contact with the front surface C81 of the main body 10. The collet booba 11 and bouba nose 15 retreat while sliding against W. The flange portion 17 of the bouba nose 15 is the water body 10
After coming into contact with and restricting the movement of the grooves, the tensile no.
It is possible to jack a tree while it is in close contact with a tree.

Therefore, according to the cholera 1-diagram of 2, if the collet boober 11 is retracted after fitting the workpiece W into the cholera (-20), the workpiece W can be adjusted manually or by a special device. The workpiece W can be chucked in a state in which it is in close contact with the reference surface 13 without being held in a state in which it is pressed against the surface 13.

In addition, in the above embodiment, the bouba nose 15 is connected to the water body 10.
It was believed that the final chuck was performed by bringing the spring 1B into contact with the spring 1B to restrict its backward movement, but in this invention, by setting the elastic force of the spring 1B sufficiently large,
Even if the booba nose 15 is a little fR away from the water body 10, it is possible to chuck the workpiece W with certainty as in the above embodiment.

As is clear from the above description, according to the expanded type cholera 1 to 100 parts of the present invention, the 11 working shafts that can be moved backward are protruded forward from the reference surface to which the workpiece should be kept in close contact with the workpiece.
At the same time, a chuck auxiliary sleeve whose tip protrudes from the reference plane is fitted to the middle part of the operating shaft so as to be movable back and forth, and the tip of the operating shaft and the tip of the chuck auxiliary sleeve are connected. A collet is installed between them, and a taper portion is formed on at least one of the tip of the operating shaft and the tip of the chuck auxiliary sleeve to expand the collets 1~ in the radial direction by bringing these two closer together. An elastic member is provided on the rear end side of the zigzag assisting sleeve to press the sleeve toward the tip side, and after fitting the workpiece to the cholera 1-, by retracting the operation η11 to the reference plane side, Since the workpiece is moved to the reference surface side together with the collet and brought into close contact with the reference surface, and the chuck is configured, the workpiece can be reliably pressed manually or without using any equipment. And it can be quickly chucked,
As a result, not only productivity is improved, but the space required for the 9-piece machine can be reduced, and safety and machining accuracy can be improved.

[Brief explanation of drawings]

Figure 1: A sectional view showing an example of a conventional expansion piece chuck; Figure 2: A cross-sectional view showing an example of a chuck;
It is an rJi plane view. 11...:) Lettbouba, 13...i 1% surface, 15...Arm 2/-'s, 16.19...Teniper part, 18...Spring, 20...Collet, ^^ , l... Workpiece. Applicant Toyota Motor Vehicles Co., Ltd. Agent Patent Attorney Wa 1) Hisashi Take (and 1 other person) Figure 1 Figure 2 42

Claims (1)

[Claims] An operating shaft that is movable back and forth is disposed so as to protrude forward from a reference surface that brings the workpiece into close contact with the workpiece, and a chuck auxiliary sleeve is arranged at an intermediate portion of the operating shaft such that its tip protrudes forward from the reference surface. It is fitted in so that it can move freely back and forth, and between the tip of the operating shaft and the chuck auxiliary sleeve,
A collet to be fitted to the workpiece is arranged, and at least one of the tip of the operating shaft and the tip of the chuck auxiliary sleeve expands the cholera 1 in the radial direction by bringing these two closer together. Formed in a tabular shape,
The expandable type L/1-jack is further characterized in that an elastic member for pressing the sleeve forward is disposed on the rear end side of the chuck-assisting sleeve.