JP2740938B2 - Outer diameter collet chuck - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer diameter collet chuck for gripping an outer peripheral surface of a work to be machined by a lathe or the like. The present invention relates to an outer diameter collet chuck capable of gripping a workpiece while suppressing deformation of the workpiece and reducing roundness and securing roundness, and capable of processing an extremely thin annular workpiece with high precision.

[0002]

2. Description of the Related Art Conventionally, an outer diameter collet chuck includes a collet having a plurality of gripping claws arranged in an arc shape, and a cylindrical body disposed around each gripping claw. A predetermined tapered surface has been formed on the facing surface between each gripping claw and the body. Then, by pulling the collet or the body, each gripping claw is moved inward by using the tapered surface of each gripping claw and the body, and the work arranged inside each gripping claw is moved to each It was configured to be gripped by the gripping claws.

[0003]

However, in the conventional outer diameter collet chuck, when the collet or the body is pulled in order to grip the work, each gripping claw portion moves inward as the pulling force increases. This increases the work interference.

[0004] Therefore, in the conventional outer diameter collet chuck, a variation in the pulling distance of the collet or the body causes variation in the interference of the work, and the work may be unnecessarily deformed and gripped.

[0005] Such deformation of the workpiece at the time of gripping is inevitable in that the arrangement position and gripping force of each gripping claw portion are inevitably varied, so that the annular workpiece is deformed into an elliptical shape or the like. When the surface of an annular workpiece is machined with high accuracy in 1 / 100mm units while maintaining roundness, the accuracy will be significantly reduced, and this will cause frequent machining defects. I was

The present invention has been made to solve the above-mentioned problems, and it is possible to suppress deformation that lowers processing accuracy, secure roundness, and grip an annular work. An object of the present invention is to provide an outer diameter collet chuck capable of processing a surface of a work with high accuracy.

[0007]

An outer diameter collet chuck according to the present invention is arranged so as to surround an annular work, and has a tapered surface on an outer surface at a distal end for narrowing an outer diameter toward a base portion. A plurality of gripping claw portions, a collet including a bottom wall portion connected to the base portion side of each of the gripping claw portions, and a bottom wall portion connected to the towing rod, and disposed around the gripping claw portions;
A body fixed to a frame including a cylindrical portion having a tapered surface that narrows the inner diameter toward the base portion on the inner peripheral surface of the distal end, and a bottom wall portion disposed on the base portion side of the cylindrical portion. Then, by the pulling of the towing rod and the sliding of the tapered surface of each gripping claw portion on the tapered surface of the body, the gripping claw portions are moved inward, and the outer peripheral surface of the work is moved to the outer peripheral surface. An outer diameter collet chuck gripped on the inner surface of each gripping claw portion, wherein the disk-shaped regulating plate portion has a diameter smaller than the outer diameter of the work by an amount corresponding to the interference of the work, and the collet is formed from the regulating plate portion. A plurality of connecting portions that are inserted through the bottom wall portion and are connected and fixed to the bottom wall portion of the body,
It is characterized by being provided inside each of the gripping claws.

[0008] The connecting portion of the stopper includes a bolt for connecting the regulating plate portion and the bottom wall portion of the body, and a distance regulating body having both ends in contact with the regulating plate portion and the bottom wall portion of the collet. It is desirable to comprise the following.

[0009]

In the outer diameter collet chuck according to the present invention, when gripping an annular workpiece, the workpiece is arranged inside the gripping claws such that the end face abuts the regulating plate of the stopper. Then, the collet is towed by the towing rod.

[0010] Then, each gripping claw portion of the collet slides its tapered surface against the tapered surface of the body cylinder portion, moves so as to contract inward, and grips the outer peripheral surface of the work.

At this time, the diameter of the work is reduced by the interference, and the inner surface of each gripping claw contacts the outer peripheral surface of the stopper plate of the stopper. Each gripping claw does not move further inward even if
Do not unnecessarily deform the work. Then, the gripped work is controlled in position so that each gripping claw is secured by the regulating plate to ensure roundness, and applies a gripping force to the work. Become.

Therefore, in the outer diameter collet chuck according to the present invention, it is possible to suppress deformation that lowers processing accuracy, secure roundness, and grip an extremely thin annular workpiece. The surface of an annular work can be machined with high precision.

The connecting portion of the stopper includes a bolt connecting the regulating plate and the bottom wall of the body, and a distance regulating body having both ends in contact with the regulating plate and the bottom wall of the body. In this case, the stopper is connected to the body by bolts, and the position of the stopper regulating plate relative to the body cylinder is regulated by the distance regulating body. Therefore, the stopper is bolted to the body. Even if it does in this way, the arrangement position of the restriction plate part of the stopper with respect to the body cylinder part can be made constant.

Therefore, if the work is arranged so that the end face abuts on the regulating plate, the positional relationship between the body cylinder and the work can be easily fixed for each work. As a result, Each gripping claw portion contracted by the tapered surface of the body cylinder portion can grip the work with a predetermined inner diameter, and can hold a state at the time of gripping each work,
A large number of works can be machined with uniform high machining accuracy.

By the way, if the stopper is simply fixed to the body by bolting, the position of the regulating plate portion of the stopper with respect to the body cylinder slightly changes due to the play of the screw thread of the bolt. When arranging the work so that the end surface is in contact with the plate portion, the arrangement positional relationship between the body cylinder portion and the work may vary from work to work.
When this variation occurs, the inner diameter of each gripping claw when gripping the work slightly shifts for each work, and although processing can be performed with high processing accuracy for each work, the processing accuracy for each work varies. It is easy to occur.

[0016]

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

The outer diameter collet chuck 1 of the embodiment is shown in FIG.
2. As shown in 2, the work W is made up of a collet 2, a body 11, and a stopper 21, and is used as a work W using an extremely thin and annular ring gear material as a work W when turning the surface of the work W. Is what is done.

The workpiece W has an inner diameter d0 of 90.0.
φ, the outer diameter D0 is 99.5φ, and the length L0 is 10.0 mm. By processing, the inner peripheral surface Wa and one end surface Wb are processed including chamfering, and the processed inner diameter d2 is 91.04.
φ and the length L2 are 9.5 mm (see FIG. 3).

The collet 2 is provided with 16 gripping claws 4 and a disc-shaped bottom wall 3 connecting the bases of the gripping claws 4.

The bottom wall 3 is formed at the center thereof with a through hole 3a into which the mounting bolt 8 is inserted, and around the through hole 3a,
Four through holes 3b are formed. And the through hole 3
The collet 2 is connected to the traction rod 7 by screwing the mounting bolt 8 inserted into the traction rod 7 to the traction rod 7. An operating rod of a hydraulic cylinder (not shown) is connected to the towing rod 7. 9 is a washer.

The gripping claws 4 are separated from each other with a slit 5 interposed therebetween, and a tapered surface 4a is formed on the outer surface of the tip. The tapered surface 4 a is formed so as to narrow the outer diameter toward the base of each gripping claw 4. Further, the inner side surface 4b of each gripping claw portion 4 is formed as an arc surface so that the outer circumferential surface of the annular work W can be gripped. Further, each slit 5 is provided with a wide portion 5a having a wide width (length in the circumferential direction in which the gripping claws 4 are arranged) near the bottom wall portion 3.

In the state where the gripping claw 4 is not pulled by the pulling rod 7, the inner diameter d1 of each gripping claw 4 is 9 in the case of the embodiment.
9.85φ.

The body 11 includes a cylindrical tubular portion 13 disposed around each of the gripping claws 4 and a bottom wall portion 12 disposed at the base of the tubular portion 13. .

The cylindrical portion 13 has a tapered surface 13a formed on the inner peripheral surface of the distal end to narrow the inner diameter toward the base (that is, to increase the inner diameter toward the distal end), and penetrates from the distal end surface to the bottom wall 12. Six stepped through holes 13b are formed. In these through holes 13b, mounting bolts 1 for mounting and fixing the body 11 to the annular adapter 15 are provided.
6 will be inserted. Note that the adapter 15 is attached to the lathe frame 19 with the mounting bolt 17 and the washer 1.
8 and is fixed. Reference numeral 13c denotes an injection hole for injecting oil into the outer periphery of the collet 2.

The bottom wall 12 has an insertion hole 12a for inserting the towing rod 7 at the center, and four stepped through holes 12b formed around the insertion hole 12a. Nuts 27 described later will be fitted into these through holes 12b.

The stopper 21 is provided with an interference of the work W (0.03 mm in the embodiment) with respect to the outer diameter D0 of the work W,
A disc-shaped regulating plate 22 having a small outer diameter D1 (99.47φ in the embodiment) and a body bottom wall 12 which is inserted from the regulating plate 22 through each through hole 3b of the collet bottom wall 3. And four connecting portions 24 that are connected and fixed to each other.

The regulating plate 22 has a through hole 22a at its center.
Are formed on the periphery of the through hole 22a.
Are formed. The cover 23 is fitted into the concave groove 22b. The cover 23 is detached when the bolt 8 is attached or detached or when chips that have entered the inside are cleaned. The concave groove 22c is used when the work W is turned.
Is provided to prevent interference with a cutting tool such as a cutting tool. Further, four stepped through holes 22d are formed on the bottom surface of the concave groove 22c. These through holes 2
The connecting portion 24 is provided in 2d.

The connecting portion 24 includes a mounting bolt 25 for connecting the regulating plate portion 22 and a nut 27 provided in the through hole 12 b of the body bottom wall portion 12, the regulating plate portion 22 and the body bottom wall portion 1.
2 and a distance regulating body 26 having both ends in contact with each other.

Each mounting bolt 25 is provided with a stepped through hole 22d.
And a shaft portion 25b having a male screw portion 25c screwed to the nut 27 at the tip.

The distance regulating body 26 has at both ends small diameter portions 26a and 26b inserted into the through holes 22d of the regulating plate portion 22 and the through holes 12b of the body bottom wall portion 12, and has an outer diameter from the through holes 22d and 12b. And collet bottom wall 3
Is formed into a substantially cylindrical shape through which a large-diameter portion 26c through which the through hole 3b is inserted and through which the shaft portion 25b of the mounting bolt 25 is inserted. Both ends of the large-diameter portion 26 c are connected to the periphery of the through-hole 22 d of the regulating plate 22 and the through-hole 1
The position of the stopper regulating plate portion 22 with respect to the body tube portion 13 is kept constant by abutting on the peripheral edge of 2b.

The manner of using the outer diameter collet chuck 1 of this embodiment will be described. The work W is arranged such that the end face Wc abuts on the regulating plate 22 of the stopper 21 inside each gripping claw 4. Thereafter, the collet 2 is pulled by the towing rod 7 so as to move to the left in FIG.

Then, as shown in FIG. 3, each gripping claw portion 4 of the collet 2 slides its tapered surface 4a against the tapered surface 13a of the body tube portion 13, moves so as to contract inward, and moves the workpiece. The outer peripheral surface of W will be gripped.

At this time, the diameter of the work W is reduced by the interference, and the inner surface 4 b of each gripping claw 4 is moved to the regulating plate 22 of the stopper 21.
After contact, even if the collet 2 is towed by the towing rod 7, each gripping claw portion 4
It does not move further inward and does not unnecessarily deform the work W. By the way, the inner diameter d2 of each gripping claw 4 at this time is 9
9.47φ. Then, the gripped work W
Since the gripping claw portions 4 are position-regulated by the regulating plate portion 22 so as to ensure roundness and apply a gripping force to the work W, the roundness is maintained.

When the gripping of the work W is completed, a predetermined start switch of the lathe is turned on, and the work W
Turning.

After the machining is completed, the towing rod 7 is returned, the machined work W is removed, the next work W is set as described above, and the work is sequentially performed.

The outer diameter collet chuck 1 of the embodiment
In this configuration, it is possible to hold the ultra-thin annular workpiece W while suppressing the deformation that lowers the processing accuracy and secure roundness, and to increase the surface Wa / Wb of the ultra-thin annular workpiece W. It can be processed with high precision.

Further, the outer diameter collet chuck 1 of the embodiment
Then, the connecting portion 24 of the stopper 21 is connected to the bolt 25 connecting the regulating plate portion 22 and the body bottom wall portion 12 to the regulating plate portion 2.
2 and a collet bottom wall 12 and a distance regulating body 26 in which both ends of a large-diameter portion 26c are in contact with each other.
1 is connected to the body 11 by the bolt 25, and the distance regulating body 26 regulates the relative position of the stopper regulating plate 22 to the body cylinder 13.
Can be fixed to the body 11 by the bolt 25, the position of the restricting plate 22 of the stopper 21 with respect to the body cylinder 13 can be kept constant.

Therefore, if the work W is arranged so that the end face Wc abuts on the regulating plate 22, the body cylinder 13
And the work W can be easily arranged at a constant position for each work W, and the tapered surface 13a
Each gripping claw 4 whose diameter is reduced by the work W
Can be held, the state at the time of holding each work can be made constant, and a large number of works W can be machined with uniform high machining accuracy.

In the embodiment, the interference of the work W is set to 0.
Although the case where the diameter is set to 03 mm is shown, this interference may be changed as long as the workpiece W can be gripped without unnecessary deformation, and the outer diameter D1 of the regulating plate portion 22 may be changed according to the interference. May be set, and if necessary, may be replaced with a regulating plate portion 22 having a predetermined outer diameter.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an outer diameter collet chuck according to an embodiment of the present invention, showing a portion II of FIG. 2;

FIG. 2 is a side view of the embodiment.

FIG. 3 is a cross-sectional view of the embodiment when it is used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Outer diameter collet chuck, 2 ... Collet, 3 ... Bottom wall part, 4 ... Gripping claw part, 7 ... Towing rod, 11 ... Body, 12 ... Bottom wall part, 13 ... Tube part, 19 ... Frame, 21 ... Stopper , 22 ... regulating plate part, 24 ... connecting part, 25 ... bolt, 26 ... distance regulating body, W ... work.

Claims (2)

(57) [Claims] 1. A plurality of gripping claws, which are arranged so as to surround the circumference of an annular work, and have a tapered surface on the outer surface at the distal end for reducing the outer diameter toward the base portion, A collet having a bottom wall portion connected to the base portion side and connected to the towing rod; and a tapered surface disposed around each of the gripping claws to reduce the inner diameter toward the base portion side at the tip inner peripheral surface. And a body fixed to a frame having a cylindrical portion and a bottom wall disposed on the base portion side of the cylindrical portion, comprising: a tow of the towing rod; and each of the gripping claws. An outer diameter collet that moves the gripping claws inward by the sliding of the tapered surface of the portion with respect to the tapered surface of the body, and grips the outer peripheral surface of the work with the inner surface of each gripping claw. A chuck having a diameter smaller than the outer diameter of the work by an amount corresponding to the interference of the work. A stopper including a plate-shaped regulating plate portion and a plurality of connecting portions fixedly connected to the bottom wall portion of the body through the bottom wall portion of the collet from the regulating plate portion, wherein each of the gripping claws is provided; An outer diameter collet chuck, which is disposed inside a part. 2. A distance in which both ends of the connecting portion of the stopper are in contact with a bolt connecting the regulating plate and the bottom wall of the body, and both ends of the bolt are connected to the regulating plate and the bottom wall of the body. The outer diameter collet chuck according to claim 1, further comprising a regulating body.