KR100618263B1 - Clamping Device of Rotary Table - Google Patents

Abstract

The present invention relates to a clamping device of a rotary table that can be improved in productivity by enabling heavy cutting in the rotary table by clamping with high rigidity.

Accordingly, according to the configuration of the present invention, in configuring the clamping device of the rotary table 16, the bottom surface of the table 16 and the upper surface of the table body 10 are coupled to each other so that the U-shaped recesses 22a are formed. (16) two-stage rotating clamp blocks 20 and 21 fixedly installed in the lower portion; And two fixed clamp blocks 20a and 21a fixed to the table body 10 so that the U-shaped recess 22b is formed while being coupled to the bottom surface of the table 16 and the top surface of the table body 10. ; The clamp is installed between the rotary clamp blocks 20 and 21 and the fixed clamp blocks 20a and 21a to have a predetermined gap for vertical operation, and clamps by interviewing each clamp block while opening up and down when supplying hydraulic oil. Instrument; It is installed in the two fixed clamp blocks 20a and 20b so as to face each other, and is installed on the upper and lower portions of the fixed clamp blocks 20a and 21a, respectively, to apply the elastic force in the inward direction so that the clamp mechanism is always unclamped. Retaining elastic springs 26; And a ball 27 installed between the elastic spring 26 and the clamp mechanism and always in point contact with the clamp mechanism to maintain an unclamped state.

Description

Clamping apparatus for rotary table

1 is a front sectional view showing an embodiment of a clamping device of a conventional rotary table.

Figure 2 is a front sectional view showing another embodiment of the conventional clamping device of a rotary table.

Figure 3 is a front sectional view showing a clamping device of a rotary table according to the present invention.

4 is an enlarged view illustrating main parts of FIG. 3;

<Description of the symbols for the main parts of the drawings>

10: table body, 16: table,

20, 21: rotating clamp block, 20a, 21a: fixed clamp block,

22a, 22b: U-shaped recess, 23a, 23b: piston brake,

24: supply flow path, 25: adapter block,

25a: connecting flow path, 26: elastic spring,

27: ball,

The present invention relates to a clamping apparatus for a rotary table employed in a machining center, and more particularly, to a clamping apparatus for a rotary table which enables heavy cutting in a rotary table to improve productivity by clamping with high rigidity. .

In general, rotary tables are machine tool attachments used when machining complex shaped products, that is, when precisely dividing in the circumferential direction is required.

Until now, the most important thing in the rotary table has been the precision of rotational positioning. However, high rigidity is often required for the production of a wide variety of products, and the rigidity of the table has become another important factor.

As shown in FIG. 1, as an embodiment of a conventional rotary table, pressure oil is sent to the chamber 14 between the table body 10 and a clamp ring 12 fixedly installed inside the table body 10. The clamp ring 12 clamps the table 16 while causing friction to the table body 10.

However, such a conventional rotary table clamping device has a problem that the processing and assembly of the table body and the clamp ring are very difficult and cannot be unclamped in a short time.

In order to improve this, the brake disc 18 is used as the clamping means of the table 16 with respect to the table body 10 as shown in FIG. 2, but it is possible to obtain a high clamping force in the axial direction but the disk is very thin and high Machining moments can adversely affect precision. In addition, when unclamping, only the elastic deformation is returned to its original position. However, the gap between the table body 10 and the brake disc 18 must be maintained at 0.05 mm in the entire area. The occurrence of burr) causes problems in the unclamp as in the prior art.

As a countermeasure, if heavy cutting is required, that is, to increase the rigidity of the table, the thrust roller bearing should be replaced with a larger one, and the preload should be increased. Therefore, in order to cope with light cutting and heavy cutting at the same time, there was a problem of having an excessively designed rotary table.

As a result, it is very expensive to prepare a peripheral device that can actively cope with the production of a wide variety of products.

The present invention has been made to solve the above problems, the object of which is the radial direction that is applied to the table with high clamping force regardless of heavy cutting or light cutting within the range of the best performance of the machine tool. To provide a rotary table clamp device that can support the force in the direction of the moment and the cylinder stroke is 1.0mm up and down when unclamping, so that it is easy to assemble and can maintain a quick and reliable unclamping state with an elastic spring. .

In order to achieve the above object, the present invention, in configuring the clamping device of the rotary table 16,
Two-stage rotary clamp blocks 20 and 21 fixed to the bottom of the table 16 so as to form a U-shaped recess 22a while being coupled to the bottom of the table 16 and the top of the table body 10; And two fixed clamp blocks 20a and 21a fixed to the table body 10 so that the U-shaped recess 22b is formed while being coupled to the bottom surface of the table 16 and the top surface of the table body 10. ; The clamp is installed between the rotary clamp blocks 20 and 21 and the fixed clamp blocks 20a and 21a to have a predetermined gap for vertical operation, and clamps by interviewing each clamp block while opening up and down when supplying hydraulic oil. Instrument; It is installed in the two fixed clamp blocks 20a and 20b so as to face each other, and is installed on the upper and lower portions of the fixed clamp blocks 20a and 21a, respectively, to apply the elastic force in the inward direction so that the clamp mechanism is always unclamped. Retaining elastic springs 26; And a ball 27 installed between the elastic spring 26 and the clamping mechanism and always in point contact with the clamping mechanism to maintain an unclamped state.

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EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described in detail based on attached drawing.

Figure 3 is a front sectional view showing a clamping device of a rotary table according to the present invention, Figure 4 is an enlarged view of the main portion of FIG.

The configuration of the present invention, in configuring the clamping device of the rotary table,

It constitutes a rotational and fixed clamp member fixedly installed on the bottom surface of the table 16 and the top surface of the table body 10, respectively.

In addition, it is installed so as to have a predetermined gap for vertical operation between the rotating clamp member and the fixed clamp member, and constitutes a clamp mechanism for contacting and clamping each clamp member while opening up and down when supplying pressure oil.

In addition, it is installed on the upper and lower portions of the fixed clamp member, respectively, to configure the elastic mechanism to always maintain the unclamp state by applying an elastic force in the inner direction of the clamp mechanism.

Meanwhile, the upper and lower rotary clamp blocks 20 and 21 of the second stage are fixed to the lower portion of the table 16 such that the U-shaped recesses 22a and 22b are symmetrically formed while being coupled to each other. And two upper and lower fixed clamp blocks 20a and 21a fixed to the table body 10.

On the other hand, the clamp mechanism is bolted so as not to be contacted in the c-shaped recesses 22a and 22b of the two-stage rotary and fixed clamp blocks 20 and 21 (20a and 21a), and selectively from the table body 10. It consists of upper and lower piston brakes 23a and 23b clamping the table 16 while being opened up and down by pressure oil through the supplied supply passage 24.

In addition, since the upper and lower piston brakes 23a and 23b of the clamp mechanism are separated from the table body 10, the upper and lower piston brakes 23a and 23b communicate with the supply passage 24 so as to receive the pressure oil from the supply passage 24. The adapter block 25 having the connection flow path 25a is fixedly installed to form a communication line for the hydraulic oil into the lower piston brakes 23a and 23b.

On the other hand, the elastic mechanism is an elastic spring 26 which is installed to face each other in the fixed clamp blocks (20a, 20b) of the two stages; A ball 27 provided between the elastic spring 26 and the piston brakes 23a and 23b and always in point contact with the clamp mechanism to maintain an unclamped state.

Referring to the operation of the present invention configured as described above are as follows.

In the assembly of the present invention, first, the lower clamping block 21 is fixed to the table 16 with bolts, and then the lower clamping block 21a is aligned with the rotating clamp block 20 while the table body is fixed. Fix it on the (10) side.

Thereafter, the elastic spring 26 and the ball 27 are fitted into the fixed clamp block 21a on the lower side, and then the preassembled piston brakes 23a and 23b are seated.

Thereafter, the fixing clamp block 20a and the upper rotating clamp block 20 of the upper side are fixed to the table body 10 and the table 16 while adjusting the height as in the above assembly, and all the assembly is completed. When assembling the fixing clamp block 20a of the upper side, the elastic spring 26 and the ball 27 are assembled inside the block as in the lower side.

When the pressure oil flows in the apparatus of the present invention assembled as described above, the feed passage 24 penetrates through the connection passage 25a of the adapter block 25 and the piston brake 23b on the lower side through the table body 10. The piston brakes 23a and 23b flow into the inner space, and each of the piston brakes 23a and 23b opens outwardly according to the operation, and thus each of the rotary clamp blocks 20 and 21 and the fixed clamp blocks. Surface friction is completely generated at (20a) (21a) to clamp the rotating table (16).

On the contrary, when the pressurized oil stuck to the connection flow path 25a and the supply flow path 24 is removed, the elastic force of the elastic spring 26 in the fixed clamp blocks 20a and 21a is returned to restore the respective piston brakes 23a. While the 23b is inwardly contracted, the state of interview with the rotational and fixed clamp blocks 20 and 21 and 20a and 21a is released, and only the point 27 is in point contact with the ball 27 to facilitate the rotation of the table 16. .

Applying the present invention as described above, because the hydraulic piston brake is completely interviewed on the rotating and fixed clamp block across the front, not only can be expected a certain clamp state, but also stable by the elastic spring and ball Unclamping can be maintained, and the effect of improving the rigidity and durability of the table can be expected.

Claims (4)

In constructing the clamping device of the rotary table 16, Two-stage rotary clamp blocks 20 and 21 fixed to the bottom of the table 16 so as to form a U-shaped recess 22a while being coupled to the bottom of the table 16 and the top of the table body 10; And Two-stage fixed clamp blocks 20a and 21a fixed to the table body 10 so as to form a U-shaped recess 22b while being coupled to the bottom surface of the table 16 and the top surface of the table body 10; The clamp is installed between the rotary clamp blocks 20 and 21 and the fixed clamp blocks 20a and 21a to have a predetermined gap for vertical operation, and clamps by interviewing each clamp block while opening up and down when supplying hydraulic oil. Instrument; It is installed in the two fixed clamp blocks 20a and 20b so as to face each other, and is installed on the upper and lower portions of the fixed clamp blocks 20a and 21a, respectively, to apply the elastic force in the inward direction so that the clamp mechanism is always unclamped. Retaining elastic springs 26; And a ball (27) installed between the elastic spring (26) and the clamping mechanism and always in point contact with the clamping mechanism to maintain an unclamped state. delete 2. The clamp mechanism according to claim 1, wherein the clamping mechanism is installed so as not to contact the U-shaped recesses 22a and 22b of the two-stage rotating and fixed clamp block, and is moved up and down by pressure oil supplied from the table body 10. Clamping device of a rotary table, characterized in that consisting of the upper and lower piston brakes (23a) (23b) for clamping the table (16) while opening. delete

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