KR100341143B1 - Spindle clamping apparatus - Google Patents

Abstract

The present invention relates to a spindle clamping device of a machine tool, and in particular, the structure is simple and the number of parts is small, so that the maintenance and the like can be easily performed.

Conventionally, the structure of the clamping part is complicated, and the number of parts is not only large, but it is difficult to disassemble the plate spring and the clamping ring deeply embedded therein during repair, and the clamping force determined once cannot be adjusted.

In order to solve this problem, the boring spindle 2 which is axially movable inside the milling spindle 1 rotatably supported in the spindle head 3 is assembled and coupled to the boring spindle 2. The guide piston 4 supported by the plurality of springs 8 embedded in the pockets of the front flange 7 retains the elasticity of the springs 8, and the like in the hook groove 42 of the guide piston 4. The wedge-shaped clamping slip 5 cut at intervals is coupled to clamp the boring spindle 2 to the wedge-shaped slope 12 formed on the inner surface of the milling spindle 1 by the guide piston 4. , The clamping sleeve (5) is coupled to the guide piston (4) is a key (6) is coupled to the configuration to prevent the clamping sleeve (5) from being pulled to one side when rotating.

Description

Spindle clamping device for machine tools {SPINDLE CLAMPING APPARATUS}

The present invention relates to a spindle clamping device of a machine tool, and in particular, the structure is simple and the number of parts is small, so that maintenance and the like can be easily performed.

Conventionally, a work machine having a hollow first spindle rotatably supported in a spindle head and a second shaft rotatably supported in the first spindle so as to be fed back and forth in the axial direction, as proposed in Korean Patent Laid-Open Publication No. 92-2267. It consists of an annular space between the first and second spindles of the spindle clamping device of the machine, an external clamping device, a spring means for clamping the first spindle and the second spindle, and an annular static pressure chamber. There are many problems, and the clamping part is complicated.

And there was a lot of difficulties in disassembling the plate spring and clamp ring embedded in the deep during the repair, and clamping force is determined in the plate spring, so once the clamp force is determined can not be adjusted.

Therefore, the present invention has a complicated structure of the clamping portion, a large number of parts, difficult to disassemble the plate spring and clamping ring embedded deeply during the maintenance, and once the clamp force determined by the conventional spindle clamping device was held I want to solve all the problems and that is the purpose.

Hereinafter, the configuration and operation effects of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of the main portion of the spindle clamping device according to the present invention,

2 is an exemplary view showing a pressure oil supply unit structure according to the present invention;

3 is another embodiment of the pressure oil supply unit according to the present invention,

<Code Description of Main Parts of Drawing>

1: milling spindle

2: boring spindle

3: spindle head

4: guide piston

5: clamping sleeve

6: tall

7: flange

8: spring

9: pressure, delivery

10: Euro

11: housing

12: flange

13: outer labyrinth

14: internal labyrinth

15: lock nut

As shown in FIG. 1, the boring spindle 2 which is axially movable inside the milling spindle 1 rotatably supported in the spindle head 3 is assembled and coupled to the boring spindle 2. The guide piston 4 supported by the plurality of springs 8 embedded in the pocket of the front flange 7 to retain the elasticity of the spring 8, the hook groove 42 of the guide piston 4 The wedge-shaped clamping slip 5 cut at equal intervals is coupled to clamp the boring spindle 2 to the wedge-shaped slope 12 formed on the inner surface of the milling spindle 1 by the guide piston 4. Consists of.

In addition, the key 6 is coupled to the clamping sleeve 5 coupled to the guide piston 4 to prevent the clamping sleeve 5 from being pulled to one side during rotation.

The action of the unclamp to release the boring spindle 2 clad on the milling spindle 1 is to be unclamped by the pressure oil transmission 9.

The hydraulic oil transmission unit 9 from the non-rotating body to the rotating body has two pockets 112, 112, 112 fixed to the housing 11 fixed to the non-rotating spindle head 3 as shown in FIG. The back pressure acts to push the guide piston 4 beyond the spring force through the oil passage 10 penetrated through the milling spindle 1, which is a rotating body assembled with a micro clearance in the housing 11, and thus the guide piston 4. The clamping sleeve 5 connected to the hook groove 42 is pushed out to un-clamp the boring spindle 2.

Fig. 3 shows another embodiment of the unclamping device, in which the oil transmission portion 9 from the non-rotating body to the rotating body has a housing 12 fixed to the main head 3 of the non-rotating body and a lock nut of the rotating body. The micro-gap between the inner labyrinth 14 and the outer labyrinth 13 by overlapping the inner labyrinth 14 and the non-rotating outer labyrinth 13, which are assembled and rotated in multiple stacks on (15). The clamping sleeve connected to the guide piston 4 by the hook groove 42 by pushing the guide piston 4 through the flow path 10 penetrated to the milling spindle 1 which is the rotating body by passing the pressure oil through (5) is pushed out to un-clamp the boring spindle (2).

As described above, according to the present invention, the conventional clamping device has a complicated structure and a large number of parts, which makes it difficult to maintain the present invention. However, the present invention has a simple structure and a low number of parts. It is a very useful invention having the effect and the like.

Claims (5)

A spindle clamping device of a machine tool having a hollow first spindle rotatably supported in a spindle head and a second shaft rotatably supported in the first spindle so as to be fed back and forth in the axial direction, wherein the spindle head (3) A plurality of springs are assembled in the pockets of the front flange 7, which are axially movable in the axial direction inside the milling spindle 1 rotatably supported therein and which are coupled to the boring spindle 2. The guide piston (4) by the (8, 8, 8) to retain the elasticity, the wedge-shaped clamping sleeve 5 cut in equal intervals is coupled to the hook groove 42 of the guide piston (4) to the Machine tool spindle clamping device, characterized in that for clamping the boring spindle (2) to the wedge-shaped inclined surface (12) formed on the inner surface of the milling spindle (1) by the guide piston (4). 2. The machine tool spindle clamping device according to claim 1, wherein a key 6 is coupled to the clamping sleeve 5 coupled to the guide piston 4 to prevent the clamping sleeve 5 from being pulled to one side during rotation. . 2. The machine tool spindle clamping device according to claim 1, further comprising a pressure oil transmission (9) for releasing a boring spindle (2) clad on the milling spindle (1). 4. The pressure oil transmission unit (9) has a plurality of pockets (112, 112, 112) in the housing (11) of the spindle head (3), which is a non-rotating body, to supply hydraulic pressure at the same time. Machine tool spindle clamping device, characterized in that to un-clamp the boring spindle (2) by the pressure oil supplied to the flow path (10) of the milling spindle (1) which is assembled into a fine gap in the). 4. The non-rotating body according to claim 3, wherein the pressure oil transmission part (9) is assembled in a plurality of stacks in the housing (12) and the lock nut (15) of the spindle head (3) to rotate. A machine tool spindle clamping device, characterized in that the boring spindle (2) is unclamped by transferring the pressure oil to a fine gap between the inner labyrinth (14) and the outer labyrinth (13) by overlapping the outer labyrinth (13).