KR20200087034A - Rotary-table apparatus of machine tools - Google Patents

Abstract

According to the present invention, a rotary table apparatus of a machine tool includes: a table base; a rotary table; a hydraulic pressure supply unit; a clamp pad which is installed in a clamp space portion formed in a fixing element to reciprocate in a rotation axis direction so that the clamp pad faces a rotary element on a rotation table side in the rotation axis direction of the rotary table and comes in close contact with or separates from the rotary element, and which has a pinhole bored in the rotation axis direction; a clamp pin which is installed by being inserted into the pinhole of the clamp pad and a pinhole formed in the fixing element in the rotation axis direction, is relatively movable with respect to one of the clamp pad and the fixing element, and is fixed to the other; and a clamp elastic member which has a pinhole formed so that the clamp pin can be fitted thereinto in the rotation axis direction, and which is inserted into the pinhole of the clamp pad or the pinhole of the fixing element together with the clamp pin to elastically support the clamp pad in a direction away from the rotary element. The rotary table apparatus of a machine tool of the present invention is advantageous in that the components can be coupled organically, simply, and densely.

Description

Rotary-table apparatus of machine tools

The present invention relates to a rotary table device of a machine tool, and more particularly, to a rotary table device of a machine tool including a clamp capable of restraining rotation of the rotary table.

Various machine tools, such as milling and machining centers, are equipped with a table for placing the work piece. A table that is installed to be rotatable so that the work piece on the table can be positioned at a certain angle is called a turn table.

Republic of Korea Patent Publication No. 10-2018-0023821 (published date; March 7, 2018) discloses a'clamp device in a split device'. Looking at this prior patent, the clamping device clamps the clamp disk by the compressed air force to the clamp piston and the clamp surface formed on the frame, thereby clamping the main shaft, and separating the clamp disk from the clamp piston by the return disk. The return disc is installed in the space between the clamp disc and the base, and when clamping, the outer circumferential part is bent and then returns to its original state, separating the clamp disc and the clamp piston.

Therefore, there is a limitation in reducing the overall size of the rotary table device because space for installing the return disk is required, and the return disk is biased to only a part of the clamp piston.

Republic of Korea Patent Registration No. 10-1228588 (date of registration; January 25, 2013) discloses a'numerical control rotary table clamp device'. Looking at this prior patent, the brake disc, the fluid pressure piston, and the disk-type return spring are installed in a line, so that the fluid pressure piston is pressed against the brake disk when the fluid pressure is applied, and the return spring when the fluid pressure is not applied. The fluid pressure piston and the brake disc are kept separated by the elastic force. This prior art also requires a space for installation of the recovery spring at least as thick as the recovery spring.

Korean Registered Patent Publication No. 10-1278093 (Registration Date; June 18, 2013) discloses a'clamp device for a rotary splitting device for a machine tool'. Looking at this prior patent, the piston member of the clamp element is pushed to the clamp disk side by a compression spring which is a spring member to clamp the original table, and the piston member is separated from the clamp disk by the working fluid pressure to unclamp the original table. State. Since this prior art uses a compression spring, a considerable installation space is required, at least as long as the length of the compression spring, and it can be considered that more durability is required in terms of precise control of the clamp operation.

Republic of Korea Patent Publication No. 10-2018-0023821 (published date; March 7, 2018) Republic of Korea Registered Patent Publication No. 10-1228588 (Registration date; January 25, 2013) Republic of Korea Registered Patent Publication No. 10-1278093 (Registration date; June 18, 2013)

The present invention has been devised to solve the above-mentioned problem, and the rotary table device of a machine tool capable of densely installing a clamp elastic member in a free space of surrounding components, and the clamp elastic member can be made of an elastic material having excellent durability. The purpose is to provide.

The rotary table device of the machine tool according to the present invention for realizing the above-mentioned problems includes a table base, a rotary table mounted to be rotatable on the table base side fixed element, and the rotary table along the rotational axis direction of the rotary table A clamp pad formed with a clamp space formed on the fixed element so as to be able to reciprocate along the rotation axis direction so as to face the side rotation element so as to be in close contact with or away from the rotation element. And, a hydraulic force supply unit connected to the clamp space portion to supply the hydraulic force to the rear side opposite to the rotating element of the clamp pad along the rotation axis direction so that the clamp pad can be in close contact with the rotating element, and the rotation axis direction A clamp pin that is inserted and installed over the pin hole of the clamp pad and the pin hole formed in the fixing element, and is movable relative to any one of the clamp pad and the fixing element and fixed to the other one, and the clamp pin The pin hole is formed to be fitted along the rotation axis direction, and the clamp pin and the pin hole of the clamp pad or the pin hole of the fixing element are elastic to support the clamp pad in a direction spaced from the rotating element. It includes a clamp elastic member that is inserted together.

The clamp comprises a first clamp formed such that mutual friction between the clamp pad and the rotating element is possible to face friction; And a second clamp installed between the first clamp and the rotating table along the rotation axis, and a mutual friction portion between the clamp pad and the rotating element is formed in a curvic coulpling structure.

The clamp pin may include a head inserted so as to be movable relative to the pin hole of the clamp pad, and a body protruding from the head and inserted into the pin hole of the fixing element and having a smaller diameter than the head. In addition, the clamp elastic member is formed in a ring shape to be fitted to the body of the clamp pin, and may be inserted into the pin hole of the clamp pad together with the head of the clamp pin.

Alternatively, the clamp pin may include a head inserted so as to be movable relative to the pin hole of the fixing element, and a body protruding from the head and inserted into the pin hole of the clamp pad and having a smaller diameter than the head. In addition, the clamp elastic member is formed in a ring shape to be fitted to the body of the clamp pin, and may be inserted into the pin hole of the clamp pad or the pin hole of the fixing element together with the head of the clamp pin.

Alternatively, the clamp pin may include a head inserted into and fixed to the pin hole of the clamp pad, and a body protruding from the head so as to be movable relative to a portion of the pin hole of the fixing element and having a smaller diameter than the head. In addition, the clamp elastic member is inserted into the pin hole of the fixing element together with the body of the clamp pin so as to be elastically deformable, one side being coupled to the body of the clamp pin and the other side being fixed to the pin hole of the fixing element. It can be tied to a pin.

Alternatively, the clamp pin may include a head inserted into and fixed to the pin hole of the fixing element, and a body protruding from the head so as to be movable relative to a portion of the pin hole of the clamp pad and having a smaller diameter than the head. In addition, the clamp elastic member is inserted into the pin hole of the clamp pad together with the body of the clamp pin so as to be elastically deformed, and one side is bound to the body of the clamp pin and the other side is clamp pin in the pin hole of the clamp pad It can be engaged with a fixed spring pin at a distance from the body of the.

In the rotary table device of a machine tool according to the present invention, a clamp pin is inserted into a pin hole of a clamp pad and a pin hole of a fixed element, and a clamp elastic member is inserted into a pin hole of a clamp pad or a pin hole of a fixed element together with a clamp pin. Since it can be, it is not necessary to separately secure a space for installing the clamp pin and the clamp elastic member externally, so that the overall configuration can be designed more organically and densely.

In addition, according to the present invention, since the clamp pin can guide the reciprocating movement of the clamp pad, the clamp pad can be uniformly brought into close contact with the rotating element without deviation.

In addition, since the present invention only needs to insert the clamp elastic member into the clamp pin and insert it into the pin hole of the clamp pad or the pin hole of the fixed element, a secondary component for coupling the clamp elastic member with the clamp pin, clamp pad or table base Is not necessary.

In addition, the present invention can easily manufacture the clamp elastic member with excellent rubber or other similar material.

1 is a half sectional view of a rotary table apparatus of a machine tool according to a first embodiment of the present invention.
FIG. 2 is an enlarged view of part'A' of FIG. 1 and shows a clamping state.
FIG. 3 is a view corresponding to FIG. 2 and showing a clamping release state.
FIG. 4 is an enlarged view of a portion'B' of FIG. 1 and shows a clamping state.
FIG. 5 corresponds to FIG. 4, and is a view showing a clamping release state.
6 is a half sectional view of a rotary table apparatus of a machine tool according to a second embodiment of the present invention.
7 is a half sectional view of a rotary table apparatus of a machine tool according to a third embodiment of the present invention.
8 is a half sectional view of a rotary table apparatus of a machine tool according to a fourth embodiment of the present invention.

When explaining a preferred embodiment of the present invention with reference to the accompanying drawings as follows.

1 to 5 are views of a rotary table device of a machine tool according to a first embodiment of the present invention.

1 to 5, the rotary table apparatus of the machine tool according to an embodiment of the present invention includes a table base 12, a rotating shaft 22, a rotating table 24, and a clamp 50 do.

The table base 12 supports the rotating table 24 to be rotatable, and has an internal space 12a in which components can be mounted. Several components are installed in the inner space 12a of the table base 12 and the outside of the table base 12 to support the rotation of the rotating table 24 together with the table base 12. Can be fixed. Table base 12 and the components fixedly installed on the table base 12 are referred to as a fixed element 10. Referring to the drawings, the elements hatched in cross section as the table base 12 are fixed elements 10.

The rotating shaft 22 penetrates and is installed in the inner space 12a of the table base 12. One end of the rotating shaft 22 (hereinafter referred to as a “front end”) may protrude out of the table base 12. A power transmission unit (not shown) that transmits rotational power of a power unit (for example, a motor) may be connected to one side of the rotation shaft 22 so that the rotation shaft 22 can be rotated at a predetermined angle.

The rotating table 24 is fixedly coupled to the front end of the rotating shaft 22 and can be mounted to be rotatable on the table base 12 which is a fixing element 10. The rotating table 24 may be coupled to rotate integrally through the rotating shaft 22 and various components. Components such as the rotating shaft 22 and the rotating table 24 that are combined to rotate integrally with the rotating shaft 22 and/or the rotating table 24 are referred to as the rotating element 20. Referring to the drawings, the elements hatched in cross section as the rotating shaft 22 and the rotating table 24 are the rotating elements 20. On the other hand, a member of the rotating element 20 that faces the clamp pad 60 to be described later is in surface contact with the clamp pad 60 so that a friction pad that prevents rotation of the rotating element 20 can generate sufficient clamping pad (described later) Corresponding to 60) may be made of a first clamp friction portion 26 installed coaxially with the rotating shaft (22). The bearing 2 between the rotating element 20 and the fixed element 10 such that the rotating element 20 including the rotating shaft 22 and the rotating table 24 is relatively free to rotate relative to the fixed element 10 This can be intervened.

Only one clamp 50 may be installed, or two or more may be installed. When two or more clamps 50 are installed, the method of controlling the rotation of the rotary table 24 may be the same, but the method of controlling the rotation of the rotary table 24 may be more precisely and efficiently performed as follows. You can do it differently. That is, the clamp 50 includes a first clamp 50 capable of decelerating the rotational speed of the rotating table 24 by surface friction, and an angle of rotation of the rotating table 24 by a curvic coupling method. Or it may include a second clamp (150) that can be ultra-precise control of the desired angle).

The first clamp 50 may be installed on the rear end side of the rotating shaft 22 along the rotating shaft 22. The second clamp 150 may be installed between the first clamp 50 and the rotating table 24 along the rotating shaft 22, that is, on the front end side of the rotating shaft 22.

In particular, referring to FIGS. 2 and 3, the first clamp 50 includes a first clamp pad 60, a first hydraulic supply unit, a first clamp pin 70, and a first clamp elastic member 80. Includes.

When the first clamp pad 60 is supported by the fixing element 10 and pressed against the rotating element 20, rotation of the rotating element 20 between the first clamp friction portion 26 of the rotating element 20 is performed. It generates a frictional force that prevents the rotation of the rotating element (20). The first clamp pad 60 is formed to a certain thickness along the rotation axis direction (arrow S). The first clamp pad 60 is reciprocated along the rotational axis direction (arrow S) so that it can be closely or spaced apart from the rotating element 20. The first clamp pad 60 may be formed in a ring shape around the rotation shaft 22 or a plurality of the rotation shafts 22 may be installed at regular intervals along the circumferential direction. The first clamp pad 60 is located at the rear of the first first clamp friction portion 26 of the rotating element 20 along the rotation axis direction (arrow S) to face the first clamp friction portion 26. . That is, the first clamp pad 60 is installed in a row immediately adjacent to the first clamp friction portion 26 along the rotation axis direction (arrow S), so that the first clamp pad 60 and the first clamp friction portion 26 ) Can be in contact with each other by facing each other.

The first clamp pad 60 may be supported by the fixing element 10 by being installed in the first clamp space 14 formed in the fixing element 10. The first clamp space portion 14 is substantially the same shape as the first clamp pad 60, and faces the first clamp friction portion 26 of the rotating element 20 so that the first clamp pad 60 can enter and exit. The front surface can be made of an open groove. An O-ring 16 may be interposed in the first clamp space portion 14 in a portion in contact with the inner circumferential surface and outer circumferential surface of the first clamp pad 60 along the radial direction of the rotating shaft 22. The O-ring 16 may be a ring shape centered on the rotation shaft 22 or a ring shape surrounding the first clamp pad 60 according to the shape of the first clamp pad 60.

The first hydraulic pressure supply part is a first clamp space part of the first hydraulic pressure supply passage 90 so that the first clamp space part 14 of the fixed element 10 can be used as a cylinder to supply hydraulic power. (14). The hydraulic pressure is the rear side of the first clamp pad 60 along the rotational axis direction (arrow S) (ie, the portion opposite to the first clamp friction portion 26 of the rotating element 20 relative to the first clamp pad 60) The first hydraulic pressure supply passage 90 may be connected to the rear end of the first clamp space portion 14 of the fixing element 10 so that it can be supplied to. That is, the first clamp pad 60 may be pressed toward the first clamp friction portion 26 of the rotating element 20 to be in close contact with the supplied hydraulic pressure.

The first clamp pin 70 is inserted and installed over the first clamp pad 60 and the fixing element 10 along the rotation axis direction (arrow S). That is, a first pin hole 62 through which the first clamp pin 70 can be inserted is formed in the first clamp pad 60 along the rotation axis direction (arrow S). The first pin hole 62 of the first clamp pad 60 may be formed through and along the rotation axis direction (arrow S). The first pin hole 62 of the first clamp pad 60 may be formed in a plurality of spaced intervals along a circumferential direction when the first clamp pad 60 is a ring-shaped centering on the rotating shaft 22. When a plurality of one clamp pad 60 is installed around the rotation shaft 22, one or a plurality of first clamp pads 60 may be formed. The first pin hole 62 of the first clamp pad 60 may be formed in a through-type in which both front and rear surfaces are opened along the rotation axis direction (arrow S). The first pin hole 62 of the first clamp pad 60 may be formed in a stepped shape with a wide front portion and a narrow rear portion along the rotation axis direction (arrow S). That is, the front portion of the first clamp pad 60 may be referred to as a large diameter portion 62a, and the rear portion of the first clamp pad 60 may be referred to as a small diameter portion 62b.

A first pin hole 18 that can be aligned with the first pin hole 62 of the first clamp pad 60 may also be formed along the rotational axis direction (arrow S) on the fixing element 10. The first pin hole 18 is located behind the first clamp pad 60. The first pin hole 18 may be formed to have the same size as the small diameter portion 62b of the first pin hole 62 of the first clamp pad 60.

In addition, the first pin hole 62 of the first clamp pad 60 allows the first clamp pad 60 to move relative to the first clamp pin 70 along the rotation axis direction (arrow S), the first clamp It may be formed to have a clearance gap for the size of the pin 70. The first pin hole 18 of the fixing element 10 may be formed such that the first clamp pin 70 can be pressed or screwed so that the first clamp pin 70 can be fixed.

Meanwhile, the first clamp pad 60 is fixed because the first clamp pad 60 is bound by the first clamp pin 70 so as not to be detached from the fixing element 10 and can be supported by the fixing element 10. There is no need for a separate component for binding to the element 10.

The first clamp pin 70 may be composed of a first head 72 having a relatively larger diameter and a first body 74 having a smaller diameter and a longer length than the first head 72. The first head 72 of the first clamp pin 70 is inserted into the large-diameter portion 62a of the first pin hole 62 of the first clamp pad 60, and the first head 72 is made of the first clamp pad 60. The small-diameter portion 62b of the one-pin hole 62 cannot be penetrated. That is, the first head 72 of the first clamp pin 70 is caught by the first clamp pad 60 along the rotational axis direction (arrow S) and cannot be displaced rearward from the first clamp pad 60. The first body 74 of the first clamp pin 70 penetrates the small diameter portion 62b of the first pin hole 62 of the first clamp pad 60, and the first pin hole of the fixing element 10 (18) is inserted and fixed.

The first clamp elastic member 80 is the first clamp pad 60 is the first clamp pad 60 is spaced apart from the first clamp friction portion 26 of the rotating element 20 when the supply of hydraulic force by the first hydraulic supply unit is stopped ), the first clamp pad 60 is elastically supported in the direction spaced from the first clamp friction portion 26 of the rotating element 20 along the rotation axis direction (arrow S) so that it can be freely rotated. The first clamp elastic member 80 is inserted into the first pin hole 62 of the first clamp pad 60 together with the first clamp pin 70. Therefore, it is not necessary to secure a separate space to install the first clamp elastic member 80. The first clamp elastic member 80 may be inserted into the large diameter portion 62a of the first pin hole 62 of the first clamp pad 60 that is relatively spatially free.

The first clamp elastic member 80 is interposed between the first head 72 and the first clamp pad 60 of the first clamp pin 70 along the rotation axis direction (arrow S), and the first clamp pin 70 It can be elastically deformed along the rotation axis direction (arrow S) according to the relative movement of the first clamp pad 60 with respect to. At this time, the first clamp elastic member 80 is the first body 74 side of the first clamp pin 70 along the rotation axis direction (arrow S) with respect to the clamp 50, the first head 72, that is, the rear side It is preferably installed.

The first clamp elastic member 80 is made of a ring-shaped pin hole so that the first clamp pin 70 can be fitted along the rotational axis direction (arrow S), so that the first clamp pin 70 and the first clamp pad ( 60) and organically simple and densely combined. That is, the first clamp elastic member 80 may be fitted to the first head side end of the first body 74 of the first clamp pin 70, that is, the front end. The longitudinal cross-section of the first clamp elastic member 80 may be formed in a substantially circular shape for compression deformation of the first clamp elastic member 80.

The first clamp elastic member 80 may be made of rubber or a similar material to have excellent durability compared to a small volume.

In particular, referring to FIGS. 4 and 5, the second clamp 150 includes a second clamp pad 160, a second hydraulic supply unit, a second clamp pin 170, and a second clamp elastic member 180. Includes.

The second clamp pad 160 may be installed at the rear of the rotating element 20 along the rotation axis direction (arrow S) to face the second clamp friction portion 28 of the rotating element 20. The second clamp pad 160 is installed to be movable relative to the second clamp space portion 15 formed like a cylinder on the fixing element 10 along the rotation axis direction (arrow S). The second clamp pad 160 is configured with a cubic forming portion 160a in which teeth of the cubic coupling are formed on a front surface facing the second clamp friction portion 28. Correspondingly, the second clamp friction portion 28 is formed with teeth that can engage the curvic formation portion 160a of the second clamp pad 160. The second pin hole 162 of the second clamp pad 160 has a rear end open, and the front end may be formed in a closed structure so as not to penetrate through the curvic forming portion 160a of the second clamp pad 160. .

The second clamp pin 170 includes a second head 172 and a second body 174. The second head 172 is inserted and fixed to the second pin hole 19 of the fixing element 10. The second pin hole 19 is located behind the second clamp pad 170. Both ends of the second pin hole 19 of the fixing element 10 are opened before and after. The second pin hole 19 of the fixing element 10 has a rear portion formed of a large diameter portion corresponding to the size of the second head 172, and a front portion formed of a small diameter portion corresponding to the size of the second body 174. . The second body 174 protrudes toward the second clamp pad 160 from the second head 172 along the rotational axis direction (arrow S), relative to the second pin hole 162 of the second clamp pad 160 It is inserted so that it can move. The second body 174 is formed to be shorter than the second pin hole 162 of the second clamp pad 160 to be inserted only in a portion of the second pin hole 162 of the second clamp pad 160, that is, the rear end. . The second sea 174 is formed to have a smaller diameter than the second pin hole 162 of the second clamp pad 160 so that the second clamp elastic member 180 can be installed. The second clamp pin 170 may be fixed by being pressed or screwed into the second pin hole 19 of the fixing element 10.

The second clamp elastic member 180 may be made of a spring. The second clamp elastic member 180 is inserted into the second pin hole 162 of the second clamp pad 160 together with the second clamp pin 170 to elastically deform along the rotational axis direction S. One side of the second clamp elastic member 180, that is, the rear end of the second clamp pin 170, the second body 174 is fitted to the outside of the state can be integrally coupled by screwing or bonding. The second clamp elastic member 180 may be bound to the other side, that is, the front end is fitted to the outside of the spring pin 185 fixed to the second pin hole 162 of the second clamp pad 160. The spring pin 185 is positioned and fixed at the front end of the second pin hole 162 of the second clamp pad 160.

The second hydraulic supply unit may be configured to be substantially the same as or similar to the first hydraulic supply unit described above. The second hydraulic supply part is connected to the rear end of the second clamp space part 15 of the fixing element 10.

When explaining the effect on the rotary table device of the machine tool according to an embodiment of the present invention configured as described above in detail, as follows.

1 and 2, when the first hydraulic supply portion is supplied to the first clamp space portion 14 of the fixing element 10, the first clamp pad 60 along the rotation axis direction (arrow S) As the hydraulic pressure is filled on the rear side, the first clamp pad 60 is moved toward the first clamp friction portion 26 of the rotating element 20 along the rotation axis direction (arrow S) by the hydraulic force. It is in close contact with the first clamp friction portion (26), and is pressed. Then, a surface friction force that prevents rotation of the rotating element 20 is generated between the first clamp pad 60 supported by the fixing element 10 and the first clamp friction portion 26 of the rotating element 20, thereby rotating. The rotation of the element 20 is decelerated.

At this time, when the first clamp pad 60 is moved toward the first clamp friction portion 26 of the rotating element 20 by the hydraulic force of the first hydraulic supply unit, the first clamp pin 70 is fixed to the first The one clamp pad 60 moves relative to the first clamp pin 70, and accordingly, the ring type interposed between the first head 72 of the first clamp pin 70 and the first clamp pad 60 The first clamp elastic member 80 is compressed and deformed flat along the rotation axis direction (arrow S).

1 and 4, in addition, when the second hydraulic supply part is supplied to the second clamp space part 15 of the fixing element 10, the second clamp pad 160 along the rotation axis direction (arrow S) As the hydraulic pressure is filled on the rear side of the second clamp pad 160 is moved toward the second clamp friction portion 27 of the rotating element 20 along the rotation axis direction (arrow S) by the hydraulic force. Then, the cubic forming portion 160a of the second clamp pad 160 and the second clamp friction portion 28 are engaged with each other in a cubic coupling method. Accordingly, the rotating table 24 is fixed at the required rotation angle (or position).

At this time, when the second clamp pad 160 is moved toward the second clamp friction portion 28 of the rotating element 20 by the hydraulic force of the second hydraulic supply unit, the second clamp pin 170 is fixed to the second The two clamp pads 160 move relative to the second clamp pin 170, so that the spring-like second clamp elastic member 180 is tensioned along the rotational axis direction (arrow S).

The first clamp 50 and the second clamp 150 may be operated at the same time or may be operated with a time difference.

As illustrated in FIG. 3, when the hydraulic supply by the first hydraulic supply unit is stopped, the hydraulic force filled on the rear side of the first clamp pad 60 is released, and the first clamp elastic member 80 that has been compressed and deformed Is restored to its original state by elastic force. At this time, since the first clamp pin 70 is fixed and the first clamp pad 60 is movable along the rotational axis direction (arrow S), the first clamp pad (by the restoring force of the first clamp elastic member 80) The surface friction force between the first clamp pad 60 and the first clamp friction portion 26 of the rotating element 20 is released as the 60) is spaced backward from the first clamp friction portion 26 of the rotating element 20, Therefore, the rotating element 20 is freely rotatable.

As shown in FIG. 5, when the hydraulic supply by the second hydraulic supply unit is stopped, the hydraulic force filled on the rear side of the second clamp pad 160 is released, and the second clamp elastic member 180 that has been tensilely deformed ) Is compressed in the original state by the elastic force. At this time, since the second clamp pin 170 is fixed, and the second clamp pad 160 is movable along the rotational axis direction (arrow S), the second clamp pad (due to the restoring force of the second clamp elastic member 180) 160 is spaced rearward from the second clamp friction portion 28 of the rotating element 20, thereby forming the cubic forming portion 160a of the second clamp pad 160 and the second clamp friction portion 28 of the rotating element 20 ), the curvic coupling state is released, and thus the rotating element 20 is freely rotatable.

Hereinafter, a rotary table apparatus of a machine tool according to a second embodiment of the present invention will be described in detail with reference to FIG. 6 as follows. However, in describing the second embodiment of the present invention, a duplicate description that is substantially the same as that of the first embodiment of the present invention described above is omitted.

The rotary table device of the machine tool according to the second embodiment of the present invention, as in the first embodiment of the present invention described above, the fixed element 10, the rotating element 20, the first clamp 200, and Two clamps 250 are included.

The first clamp 200 includes a first hydraulic pressure supply unit, a first clamp pad 210, a first clamp pin 220, and a first clamp elastic member 230, and the first clamp elastic member 230 ) Is made of spring.

That is, the first clamp pad 210 and the first clamp pin 220 are integrally coupled by a press-fitting method or screw fastening so as to be movable together along the rotational axis direction (arrow S).

The first head 222 of the first clamp pin 220 is inserted and fixed to the first pin hole 212 of the first clamp pad 210. The first body 224 of the first clamp pin 220 protrudes from the first head 222 toward the first pin hole 18 of the fixed element 10 and the first pin hole of the fixed element 10 ( 18) is inserted to allow relative movement on a part, i.e.

The first clamp elastic member 230 is inserted into the first pin hole 18 of the fixing element 10 to be elastically deformable along the rotation axis direction (arrow S), and the front side is made of the first clamp pin 220. It is bound to one body 224, and the rear side is bound to a spring pin 235 fixed to the rear end of the first pin hole 18.

The second clamp 250 includes a second hydraulic supply unit, a second clamp pad 260, a second clamp pin 270, and a second clamp elastic member 280, and the second clamp elastic member 280 ) Is made of a ring.

That is, the second clamp pad 260 and the second clamp pin 270 are integrally coupled by a press-fitting method or screw fastening to move together along the rotational axis direction (arrow S).

The second head 272 of the second clamp pin 270 is inserted into the second pin hole 19 of the fixing element 10 so as to be relatively movable. The second body 274 of the second clamp pin 270 protrudes from the second head 272 toward the second pin hole 262 of the second clamp pad 260 and is inserted and fixed.

The second clamp elastic member 230 is inserted into the second pin hole 19 of the fixing element 10 together with the second head 272 of the second clamp pin 270, the second clamp pin 270 To be positioned in front of the second head 272, it is fitted outside the rear end of the second body 274 of the second clamp pin 270.

When explaining the effect of the rotary table device of the machine tool according to the second embodiment of the present invention configured as described above in detail, as follows.

When the hydraulic pressure is supplied by the first hydraulic pressure supply unit, the first clamp pad 210 is moved forward and is in surface friction with the first clamp friction unit 26 of the rotating element 20. At this time, as the first clamp pin 220 moves forward with the first clamp pad 210, the spring-type first clamp elastic member 230 is tensioned.

In addition, the hydraulic pressure of the second hydraulic supply unit is supplied, and the second clamp pad 260 moves forward to engage the second clamp friction unit 28 of the rotating element 20 in a cubic coupling manner. At this time, as the second head 272 of the second clamp pin 270 is moved relative to the second pin hole 19 of the fixing element 10, the ring-shaped second clamp elastic member 280 is deformed by compression.

On the other hand, when the hydraulic supply of the first hydraulic supply unit is released, the first clamp elastic member 230 is compressed in its original state, and the first clamp pad 210 together with the first clamp pin 220 moves rearward to rotate the table 24 ) Can be rotated freely.

In addition, the hydraulic supply of the second hydraulic supply is released, the second clamp elastic member 280 is restored to the original state, the second clamp pin 270 and the second clamp pad 260 moves backward to rotate the table 24 ) Can be rotated freely.

On the other hand, as still other embodiments of the present invention, as shown in FIG. 7, the first clamp elastic member C1 and the second clamp elastic member C2 are both formed in a ring shape or as illustrated in FIG. 10. Both the clamp elastic member (C1) and the second clamp elastic member (C2) may be formed in a spring shape.

As described above, the technical ideas described in the embodiments of the present invention may be implemented independently of each other, or may be implemented in combination with each other. In addition, the present invention has been described through the embodiments described in the drawings and the detailed description of the invention, which is merely exemplary, and those skilled in the art to which the present invention pertains may have various modifications and other equivalent embodiments It is possible. Therefore, the technical protection scope of the present invention should be defined by the appended claims.

10; Fixing element 12; Table base
20; Rotating element 22; Rotating shaft
24; Turntable 26; Friction part of the first clamp
28; A second clamp friction portion 50; 1st clamp
60; A first clamp pad 70; 1st clamp pin
80; A first clamp elastic member 150; 2nd clamp
160; A second clamp pad 270; 2nd clamp pin
280; Second clamp elastic member

Claims (4)

It includes a table base, a rotating table mounted to be rotatable on the table base side fixing element, and a clamp for selectively controlling rotation of the rotating table;
The clamp
It is installed so as to be reciprocable along the rotation axis direction in the clamp space formed in the fixed element so as to face or be spaced apart from the rotation element on the rotation table side along the rotation axis direction of the rotation table. A clamp pad with a pinhole formed therethrough, and
A hydraulic force supply unit connected to the clamp space portion to supply hydraulic pressure to the rear side opposite to the rotating element of the clamp pad along the direction of the rotating shaft so that the clamp pad can be in close contact with the rotating element;
A clamp pin that is inserted through the pin hole of the clamp pad and the pin hole formed in the fixing element along the direction of the rotation axis, and is movable relative to any one of the clamp pad and the fixing element and fixed to the other one;
A pin hole is formed so that the clamp pin can be fitted along the rotation axis direction, and the pin hole of the clamp pad or the pin hole of the fixing element is elastically supported so that the clamp pad is spaced apart from the rotation element. A rotary table device of a machine tool, comprising: a clamp elastic member inserted together with a clamp pin. The method according to claim 1,
The clamp pin is inserted into the pin hole of the clamp pad and the pin hole of the fixing element so as to be relatively movable, and the rest of the pin hole of the clamp pad and the pin hole of the clamping element protruding from the head. It is inserted and fixed in one and includes a body having a diameter smaller than that of the head;
The clamp elastic member is formed in a ring shape that fits into the body of the clamp pin, and is inserted into a pin hole of the clamp pad or a pin hole of the fixing element together with a head of the clamp pin. Device. The method according to claim 1,
The clamp pin is a head inserted into and fixed to any one of the pin hole of the clamp pad and the pin hole of the clamping element, and a part of the other of the pin hole of the clamp pad and the pin hole of the clamping element protruding from the head. It is inserted so as to be moved relative to and includes a body having a diameter smaller than the head;
The clamp elastic member is inserted into the pin hole of the clamp pad together with the body of the clamp pin so as to be elastically deformable, one side is bound to the body of the clamp pin, and the other side is attached to the pin hole. A rotating table device of a machine tool, characterized in that it is bound to a fixed spring pin at a distance from the body of the clamp pin. The method according to any one of claims 1 to 3,
The clamp
A first clamp formed such that mutual friction between the clamp pad and the rotating element is capable of surface friction;
And a second clamp installed between the first clamp and the rotating table along the rotation axis, and a mutual friction portion between the clamp pad and the rotating element is formed in a curvic coulpling structure. Rotary table device for machine tools.

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