KR20090032956A - Clamp device for rotary indexing device of machine tool - Google Patents

Abstract

A clamp device for a rotary indexing device of a machine tool is provided to increase the pressure power of a piston member and apply the pressure power on a clamp disk by including three or more clamp levers installed in order to be extended in a radial direction of a rotary shaft. A clamp device for a rotary indexing device of a machine tool comprises three or more clamp levers(11) installed in order to be extended in a radial direction of a rotary shaft(5) between a clamp disk(8) and a piston member(6). Each more clamp lever comprises: a fulcrum part(13) contacted with the piston member and engaged to be rotatable to a housing(3); and an action point part(14) facing a clamp side(9).

Description

Clamp device for rotary splitting device for machine tool {CLAMP DEVICE FOR ROTARY INDEXING DEVICE OF MACHINE TOOL}

The present invention relates to a clamp device for a rotary splitting device used in a machine tool.

Patent document 1 is disclosing the rotary table apparatus as a rotation splitting apparatus provided with the clamp apparatus of the prior art which becomes the premise of this invention. The clamp device of this rotary table device is a so-called disk type clamp device, which displaces the piston by hydraulic pressure, presses the pressure surface of the piston against the clamp disk, and the clamp surface of the housing (expected frame). The clamp disc fixed to the rotary shaft of the rotary table is cooperatively held to maintain the divided position of the rotary table.

In such a disk-type clamp device, the piston member is displaced to the clamp disk side by supplying a working fluid (pressure oil, etc.) to the pressure chamber between the housing and the piston member, and the pressing force against the clamp disk by the pressure surface of the piston member. In this configuration, the pressing force for holding the clamp disk corresponds to the pressure of the working fluid that the piston member receives on the hydraulic pressure surface.

However, in the clamp force obtained only by the pressing force corresponding to the pressure of such a working fluid, it is not necessarily sufficient as the clamp force required at the time of heavy load processing. And when clamping force is not enough with respect to the load applied to a rotation drive object member through a workpiece | work etc. at the time of a process, a difference will arise in a split position, and the processing precision will fall.

[Patent Document 1] Japanese Patent Publication No. Pyeongseong 10-220425

Accordingly, an object of the present invention is to provide a clamping mechanism for generating a sufficient clamping force that can withstand high load machining in a clamping device for a rotary splitting device for a machine tool, thereby providing a clamping force (holding force) The rotational drive target member can maintain the divided angular position, thereby preventing a decrease in the degree of machining, miniaturizing the apparatus, and improving the processing efficiency.

Under the above-mentioned problems, the clamp device 2 of the present invention comprises three or more sperm members 11 provided between the clamp disk 8 and the piston member 6 so as to extend in the radial direction of the rotation shaft 5. ), And a clamping mechanism made of sperm is applied to the clamp disk 8 by increasing the pressing force of the piston member 6 according to the principle of sperm.

Specifically, the invention of claim 1 is installed so as to rotate freely in the housing (3), the rotary shaft 5 and the angular position of the rotary shaft 5 is fixed to the end of the rotation drive target member (4) As a clamp device (2) for holding a clamp disc (8) attached so as to be relatively rotatable relative to the rotary shaft (6) and installed so as to be displaceable in the axial direction of the rotary shaft (5) in the housing (3) Force the piston member 6 and the piston member 6 to apply a force against the clamping disk 9 of the housing 3 against the clamping disk 8 toward the clamping disk 8. In the rotary splitting apparatus 1 for a machine tool having the clamping device 2 including the biasing means 7, the clamping device 2 is provided between the clamp disk 8 and the piston member 6. , Extending in the radial direction of the rotating shaft (5) A clamp mechanism comprising three or more sperm members 11 that are locked is provided, and each of the sperm members 11 is in contact with the piston member 6 in the stationary portion 12 formed at one end thereof. And a point portion 13 rotatably rotatable relative to the housing 3 and an action point portion 14 fitted with the clamp disc 8 and opposing the clamp surface 9, wherein the reverse point portion The distance from (12) to the point part 13 is formed so that it may become longer than the distance from the said point part 13 to the acting point part 14. FIG.

In the clamp device 2 of the invention of claim 1, the invention of claim 2 is a ring shape provided between the clamp disk 8 and the sperm member 11 so as not to rotate relative to the housing 3. The clamp mechanism is configured to include a clamp member 10.

The clamp device 2 of the invention of claim 1 comprises a clamp mechanism comprising three or more sperm members 11 provided between the clamp disk 8 and the piston member 6 so as to extend in the radial direction of the rotation shaft 5. Since it is provided, the pressing force of the piston member 6 can be increased and acted on the clamp disk 8 according to the principle of sperm.

In more detail, with the displacement of the piston member 6 by the biasing means 7, first, the inverted portion 12 of the sperm member 11 in contact with the piston member 6 is the piston member 6. ) Is pressurized. Since the sperm member 11 is stopped in the point portion 13 so as to be rotatable with respect to the housing 3, the sperm member 11 rotates about the point portion 13 by the action of the pressing force, and accompanies it. By inserting the clamp disk 8, the working point portion 14 facing the clamp surface 9 of the housing 3 is displaced to the working point portion 14 and the clamping surface 9 of the sperm member 11. The clamp disc 8 is fitted (clamped).

At this time, since the sperm member 11 is formed so that the distance from the inversion part 12 to the point part 13 becomes longer than the distance from the point part 13 to the action point part 14, the principle of sperm As a result, the pressing force acting on the reverse point portion 12 is increased to act on the clamp disk 8 from the operating point portion 14. As a result, a sufficiently large clamping force can be generated as compared with the conventional clamping device which clamps the clamp disk 8 with a clamping force corresponding to the pressing force of the piston member 6. In addition, the following effects can be obtained by being able to generate such a large clamp force.

(1) Since the clamping device maintains the angular position at which the rotational target member is divided by a firm clamping force (holding force), even if a high load is applied to the rotational driving target member, there is no difference in the divisional position, thereby preventing a decrease in machining accuracy. can do.

(2) The rotary splitter can be miniaturized. That is, in order to obtain a large clamping force in the conventional clamping apparatus, it is necessary to make a large diameter of the clamp disk, and the clamping apparatus becomes large with it. On the other hand, according to the clamp device 2 of the present invention, by using the principle of sperm, sufficient clamp force can be obtained without large diameter of the clamp disk, so that the clamp device can be miniaturized.

(3) Further, for example, in the case where the rotary splitting device for a machine tool is a rotary table device, that is, when the rotating drive target member is a round table, the clamping force is not sufficient in the conventional clamping device. In order to maintain it, the force in the rotational direction acting on the round table with the machining load must be avoided. For this reason, consideration is required to reduce the moment applied to the original table, such as installing the workpiece near the center of the table at the time of processing the workpiece, and limiting the number of workpieces that can be attached and processed on the original table at one time. Will receive. On the other hand, according to the clamp device 2 of the present invention, since the circle table can be clamped with a sufficient clamping force that can withstand high load processing, the force in the rotational direction accompanying the processing load tends to increase from the center of the circle table. It becomes possible to install a workpiece in a distant position, and can process it at once, without changing a step, and can increase the number of workpiece | work more than before, and can improve processing efficiency.

According to the clamp device 2 of the invention of claim 2, in the clamp device 2 of the invention of claim 1, the clamp disk 8 and the sperm member 11 are disposed relative to the housing 3. Since it is provided with the ring-shaped clamp member 10 provided so that rotation is impossible, the clamp member 10 will elastically displace to the clamp disk 8 side, when receiving the pressing force from the sperm member 11, and will clamp the clamp disk. In contact with the clamp disk 8 at the outer edge of (8), the clamp force of the clamp lever 19 can be made to act substantially uniformly throughout the clamp disk 8, maintaining a stable clamp state. It becomes possible.

The present invention is applied to a rotation splitting apparatus for a machine tool used for dividing an angle of a workpiece.

Example 1

1 shows a rotary table device 15 as an example of the rotary splitting apparatus 1 for a machine tool to which the present invention is applied. The rotary table device 15 is a device attached to the housing 3 serving as a base so that the round table 16, which is the rotation driving object member 4, is freely rotated, and is also called an index table or a rotary table.

The rotary table device 15 will be described in more detail. The round table 16 is fixed to one end of the rotary shaft 5 provided so as to rotate freely in the housing 3, and the rotary shaft 5 is The bearing sleeve 18 is rotatably supported by the bearing 17 fixed to the housing 3.

In addition, the rotation table device 15 is a drive means for the round table 16, and is supported by the worm wheel 20 fixed to the rotation shaft 5 and the housing 3 so as to be rotatable, and the worm wheel 20 It has the worm gear 21 which meshes with each other, and the motor which is not shown in figure which drives the worm gear 21 in rotation. On the other hand, in this example, a worm gear mechanism is employed as the drive means of the one-table 16, but a DD motor (direct (direct drive type) that drives the rotary shaft 5 directly without passing through a drive transmission mechanism such as a gear). Drive motor) may be used as a drive means (drive source).

At the other end of the rotating shaft 5, a clamp device 2 which is a characteristic part of the present invention is provided. The clamping device 2 is roughly explained by pressing and clamping the clamp disk 8 which is assembled to be relatively rotatable with respect to the rotation shaft 5 against the clamp surface 9 formed in the housing 3. The rotational shaft 5, that is, the rotation driving target member 4 (circle table 16) is kept unrotable.

In the clamping device, the clamp device is always held in a clamped state, and the clamped disk is normally clamped by releasing the clamped state of the clamp disk only during the dividing operation to free the rotating drive object. In the free state, there are always two types of unclamping types in which the clamp disc is held only at the time of clamping to hold the rotation drive target member in a rotatable manner. The present invention can be applied to any of the above forms, but in the present example, an example in which the present invention is applied to the latter, always unclamp type clamp device will be described.

The clamp device 2 will be described in more detail. The clamp device 2 includes the clamp disk 8 described above and the sperm member 11 facing the clamp surface 9 with respect to the clamp disk 8. A piston member 6 for exerting a pressing force, a ring-shaped groove 23 centered on the axis of the rotary shaft 5, and a case member 22 fixed to the housing 3, and a piston member ( 6) has a urging means 7 for applying a force to the clamp disk 8 side.

The piston member 6 has a ring shape, is inserted into the ring-shaped groove 23 of the case member 22 so as to be displaceable in the axial direction of the rotational shaft 5, and is further inserted into the case member 22. The fixing member 24 is held in the groove 23 by the fixed locking member 24. In addition, between the piston member 6 and the locking member 24, there are a plurality of compression springs 25 on a circumference around the axis of the rotational shaft 5, and the compression spring 25 is a piston member ( 6) is always applied to the half clamp disk 8 side (unclamp direction).

On the other hand, a pressure chamber 26 is formed between the piston member 6 and the groove 23, and the fluid port 27 provided in the housing 3 from a fluid supply source (not shown) in the pressure chamber 26. The working fluid (pressure oil) for clamp is supplied through the fluid flow path 28 formed in the case member 22. These comprise the biasing means 7 which applies the piston member 6 to the clamp disk 8 side (clamp direction).

The clamp lever 19 as three or more sperm members 11 provided so that the clamp disk 8 and the piston member 6 may extend in the radial direction of the rotating shaft 5 is assembled. FIG. 2 is a cross-sectional view along the line A-A in FIG. 1, and the clamp lever 19 is disposed at equal intervals around the rotation shaft 5 in order to generate the clamp force evenly around the rotation shaft 5.

Although the shape of the clamp lever 19 as the sperm member 11 can be considered in various ways, in this embodiment, the long arm part and the short arm part are integrally formed in the curved part used as a point. The J-shaped member which connected is adopted. The clamp lever 19 is in contact with the piston member 6 in the inflection portion 12 formed at the end of the armband, and rotates with respect to the case member 22 in the point portion 13 formed in the curved portion. The clamp disk 8 is inserted and opposes the clamp surface 9 in the working point portion 14 which is stopped and possibly formed at the end of the forearm.

In the dividing operation of the round table 16, a working fluid for clamp is supplied to the pressure chamber 26, and the pressure causes the piston member 6 to resist the spring force of the compression spring 25 to clamp the disk. Displaced to the (8) side, the piston member 6 is pressed against the clamp surface 9 of the housing 3 by pressing the clamp disk 8 with the clamp lever 19 and the clamp member 10 described later. The clamp disk 8 is clamped in cooperation.

In FIG. 3, the clamp lever 19 has a distance b from the point 12 of the clamp lever 19 to the point 13 and the distance b of the point 13 from the point 13. It is formed to be longer. As a result, the pressing force of the piston member 6 is amplified almost a / b times on the principle of sperm, and acts on the clamp disk 8. By changing the lever ratio a / b, the clamp force can be easily increased or decreased.

In addition, in the present embodiment, the working point portion 14 of the clamp lever 19 presses the clamp disk 8 with the clamp ring serving as the clamp member 10 interposed therebetween. The clamp ring is a ring-shaped thin board member, which is fixed to the stop member 24 at a base in the radially inner side thereof, and is attached to the housing 3 so as not to rotate relatively. In contact with the working point portion 14 of the clamp lever 19 on the side, the other surface faces the surface of the clamp disk 8 at a small distance. When the clamp ring receives the pressing force from the sperm member 11, the clamp ring is elastically displaced toward the clamp disk 8, and is in contact with the clamp disk 8 at the outer edge of the clamp disk 8. Thereby, the clamping force of the clamp lever 19 can be made to apply substantially uniformly over the clamp disk 8, and it becomes possible to maintain a stable clamp state. On the other hand, it is also possible to omit the clamp member 10 (clamp ring) and directly press the clamp disk 8 by the clamp lever 19. However, in this case, since the clamp location by the clamp lever 19 is local, it is more preferable to provide the clamp member 10 as mentioned above.

In the present embodiment, among the components constituting the clamping device 2, parts other than the clamp disk 8 are unitized, and the clamping device is rotated from the main body of the rotary table device 15 by peeling off the attachment screw 29. It becomes the structure which can remove easily (2) for every unit. However, if it is not considered that the clamp device 2 is unitized, the outer circumferential surface of the piston member 6 is guided by the housing 3 in the axial direction, or the clamp lever 19 It is also possible to engage the point portion 13 directly to the housing 3 without interposing the case member 22.

Example 2

4 and 5 show an example in which a member having a different shape is used for the sperm member 11 (clamp lever 19) in the rotary table device 15 as in the first embodiment. In the clamping mechanism of the first embodiment, the point portion 13 is formed between the working point portion 14 and the reverse point portion 12, but in this example, between the point portion 13 and the reverse point portion 12, The working point part 14 is formed. Thus, if the sperm member 11 is formed so that the distance a from this inverse point part 12 to the point part 13 may become longer than the distance b from the point part 13 to the acting point part 14, Various shapes can be adopted in the design.

Example 3

FIG. 6: is the example in which the clamp member 10 (clamp ring) is being fixed to the case member 22 in the outer peripheral part side in the rotary table apparatus 15 like Example 1. As shown in FIG. On the other hand, also in the present embodiment, among the components constituting the clamping device 2, other parts than the clamp disk 8 are unitized, but the piston member ( The outer circumferential surface of 6) is guided by the housing 3 to be displaced in the axial direction, or the housing 3 is not fixed to the case member 22 as in the illustrated example. It may be possible to fix it directly).

Example 4

7 shows an example in which the present invention is applied to a clamp device of a constant clamp type. In this example, the clamp device 2 uses the spring member 30 (compression spring) as the biasing means 7 around the axis of the rotary shaft 5 between the case member 22 and the piston member 6. It has a plurality on a circumference, and the spring member 30 applies the piston member 6 to the clamp disk 8 side (clamp direction) at all times. As a result, the piston member 6 presses the clamp disk 8 at all times with the clamp lever 19 interposed therebetween, and cooperates with the clamp surface 9 of the housing 3 to provide the clamp disk 8. , And the round table 16 is clamped.

Moreover, as an unclamping means for releasing a clamped state, the pressure chamber 31 for unclamping is formed between the piston member 6 and the locking member 24, and the pressure chamber 31 is shown in figure. The operating fluid (pressure oil) for unclamping is supplied from the non-fluid supply source through the fluid flow path 32 formed in the case member 22.

In the dividing operation of the round table 16, the working fluid is supplied to the pressure chamber 31 so that the piston member 6 resists the spring force of the spring member 30 and thus the half clamp disk 8 side (unclamped). Direction), and the clamping force to the clamp disk 8 by the clamp lever 19 which is not accompanied by this is released, and the rotary table device 15 is in an unclamped state, and the original table 16 { The rotating shaft 5} is in a rotatable state.

On the other hand, in the example of illustration, in addition to the spring member 30 as the biasing means 7, the pressure chamber 26 is provided between the piston member 6 and the groove | channel 23, and the pressure chamber 26 is shown in figure. The working fluid (pressure oil) for clamping is supplied through the fluid flow path 28 formed in the case member 22 from the non-fluid supply source. Thereby, in addition to the clamping force by the spring member 30 (compression spring), screw retightening (increase of clamping force) by fluid pressure is enabled.

FIG. 8 shows a clamp lever 19 (sperm member 11) according to the present invention for a clamp device in which both the displacement of the piston member 6 in the clamp direction and the unclamp direction is performed by supply of a working fluid. } Is an example of application. The clamping device of this example can be made of either a constant clamp type or a constant unclamp type.

In the above embodiment, the clamp lever 19 corresponding to the sperm member 11 is all one point, the inverted point and the acting point, respectively, but, for example, the end of the acting point side is divided into two or more acting points. The member may be two or more. Similarly, it is good also as a member which divides the edge part of a stationary side into two or more branches, and has a stationary point two or more. Further, the end portion on the working point side or the end portion on the inverted point side may be made wide such that the member is in surface contact with the clamp member 10 (clamp disk 8) or the piston member 6.

[Industry availability]

The present invention can be widely applied to a braking device for braking a rotating shaft or the like by clamping a disk. That is, the rotation splitting apparatus (rotational drive member) is not limited to the rotary table apparatus of the embodiment. For example, a device (spindle head) for pivoting by supporting a device (spindle unit) which rotates and drives a spindle on which a tool is mounted, or a spindle head for supporting a spindle unit, around an axis parallel to the Z axis of a machine tool. And a portion (apparatus) for rotating. In the former case, the spindle unit corresponds to the rotation driving object member, and in the latter case, the spindle head corresponds to the rotation driving object member.

1 is a cross-sectional view of the rotary splitting apparatus 1.

Fig. 2 is a cross-sectional view along the line A-A in Fig. 1.

3 is a detailed cross-sectional view of the rotary splitter 1 around the clamp device 2.

4 is a cross-sectional view of the rotary splitting apparatus 1.

5 is a detailed cross-sectional view of the rotary splitter 1 around the clamp device 2.

6 is a detailed cross-sectional view of the rotary splitter 1 around the clamp device 2.

FIG. 7 is a detailed cross-sectional view of the rotary splitter 1 around the clamp device 2.

8 is a detailed cross-sectional view of the rotary splitter 1 around the clamp device 2.

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

1: Rotating Split Device 2: Clamp Device

3: housing 4: rotation drive object member

5: rotating shaft 6: piston member

7: biasing means 8: clamp disk

9: clamp surface 10: clamp member

11: sperm member 12: emphasis

13: branch part 14: working point part

15: rotary table device 16: circle table

17: bearing 18: bearing sleeve

19: clamp lever 20: worm wheel

21: worm gear 22: case member

23: groove 24: stop member

25 compression spring 26 pressure chamber

27: fluid port 28: fluid flow path

29: mounting screw 30: spring member

31 pressure chamber 32 fluid flow path

Claims (2)

The rotating shaft 5 is installed to rotate freely in the housing 3 and the rotating drive member 4 is fixed to the end thereof, and the clamping device 2 for maintaining the angular position of the rotating shaft 5. The clamp disk 8 is mounted so as not to rotate relative to the rotating shaft 5 and is installed in the housing 3 so as to be displaceable in the axial direction of the rotating shaft 5 so that the housing is held relative to the clamp disk 8. Clamp device 2 comprising a piston member 6 for exerting a pressing force toward the clamp surface 9 of (3) and biasing means 7 for applying the piston member 6 to the clamp disk 8 side. In the rotary splitting apparatus 1 for a machine tool having The clamp device (2) is provided with a clamp mechanism comprising three or more sperm members (11) provided between the clamp disk (8) and the piston member (6) so as to extend in the radial direction of the rotation shaft (5). Each sperm member 11 is in contact with the piston member 6 in the inverted portion 12 formed at one end thereof, and is stopped in a rotatable manner relative to the housing 3. It has a point portion 13 and an acting point portion 14 which sandwiches the clamp disk 8 and faces the clamp surface 9, and the distance from the point portion 12 to the point portion 13 is the point. Clamping apparatus (2) for a rotary splitting device for a machine tool, characterized in that it is formed to be longer than the distance from the portion (13) to the working point portion (14). 2. The clamp mechanism according to claim 1, wherein the clamp mechanism includes a ring-shaped clamp member 10 provided between the clamp disk 8 and the sperm member 11 so as not to rotate relative to the housing 3. Clamping device (2) for a rotary splitting device for a machine tool, characterized in that.

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