JPH10166223A - Wire electric discharge machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To highly precisely assemble a whole machine at a low profile and improve the positioning precision of a wire guide. SOLUTION: A machining tank 4 with a fixed wall 5 and an elevatable wall 7 is provided around a table 3. A sadde 15 is supported on a bed 1 to be movable to an X-axial direction, with one end exposed into the machining tank 4 via a slit 19 in the fixed wall 5 to mount a seal member 21 on the exposed portion 20. A slider 23 is arranged on the saddle 15 to be movable to a Y-axial direction and a lower arm 27 is provided inside of the sadde 15 to be movable to a V-axial direction parallel to the Y-axial direction. The lower arm 27 is guided through the exposed portion 20 into the machining tank 4 and a lower wire guide 31 is provided at the guide end. An upper arm 38 is placed on the slider 23 to be movable to a U-axial direction parallel to the X-axial direction, a head 42 is supported on the upper arm 38 to be elevatable and an upper wire guide 44 is provided at the lower end of the head 42.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire electric discharge machine for performing electric discharge machining by relatively moving a wire electrode and a work.

[0002]

2. Description of the Related Art Generally, electric discharge machining is performed in a machining tank filled with a machining fluid, but in recent years, a method of immersing a wire electrode in a machining fluid for machining has also been widely used in a wire electric discharge machine. I have. In this case, the wire electric discharge machine is required to have a mechanical configuration suitable for unmanned operation including automatic replacement of a workpiece.

For example, in the wire electric discharge machine disclosed in Japanese Patent Application Laid-Open No. 7-266136, a table 52 is provided on a bed 51, and a work 53 can be automatically attached and detached on the table 52, as shown in FIGS. A pallet mount 54 having a built-in chuck is provided. Table 52
A saddle 55 is supported on the bed 51 at the rear side so as to be movable in the X-axis direction, and a column 56 is mounted on the saddle 55 so as to be movable in the Y-axis direction.

A processing tank 57 is provided around the table 52, a fixed wall 58 is fixed to the table 52, and a flat U-shaped elevating wall 59 is moved by a motor (not shown) to a rack 6 (not shown).
It is driven up and down with respect to the table 52 via the pin 0 and the pinion 61. A long hole 62 long in the moving direction of the saddle 55 is formed in the fixed wall 58.
Are provided so as to protrude into the processing tank 57 through the long holes 62.

A lower wire guide 65 for guiding the lower end of the wire electrode 64 is attached to the projecting end of the arm 63.
A seal 66 that seals the long hole 62 is provided in the middle of the arm 63. A seal 67 is provided on the peripheral surface of the table 52 so as to open and close a gap between the elevating wall 59 and the opening. The seal 67 is opened to collect the dirty machining fluid in the machining tank 57 into the tank 68 and to supply the machining fluid supply device 69. Circulates and supplies to the processing tank 57.

A V-axis slider 70 is mounted on the column 56 so as to be movable in the V-axis direction parallel to the direction of movement of the column 56, and a U-axis slider 71 is provided on the front surface of the V-axis slider 70 in the direction of movement of the saddle 55. It is provided movably in the parallel U-axis direction. A head 72 is supported on the U-axis slider 71 so as to be able to move up and down in the Z-axis direction, and an upper wire guide 73 for guiding an upper end of the wire electrode 64 is attached to a lower end thereof. In FIG. 5, reference numeral 74 denotes an NC / power control device for controlling the entire wire electric discharge machine.

At the time of ordinary electric discharge machining, the upper wire guide 73 is positioned at a height corresponding to the thickness of the work 53 by the head 72, and the upper wire guide 73 and the lower wire guide 65 are positioned at the same XY coordinate value. , The saddle 55 and the U-axis slider 71 are integrally moved in the X-axis direction,
The column 53 and the V-axis slider 70 are integrally moved in the Y-axis direction, and the workpiece 53 is processed by the vertical wire electrode 64. When the U-axis slider 71 is moved relative to the saddle 55 and the V-axis slider 70 is moved relative to the column 56, the conical surface of the workpiece 53 can be formed by the oblique wire electrode 64.

[0008]

However, the conventional wire electric discharge machine has the following problems. (1) Four moving objects, ie, column 5 on the saddle 55
6, since the V-axis slider 70, the U-axis slider 71, and the head 72 are stacked, the overall height of the machine is increased and the rigidity is reduced. (2) Since the guide surfaces of the moving bodies are relatively far apart, it is difficult to confirm the accuracy between the guide surfaces, and an assembly error is likely to occur. (3) Since the arm 63 directly penetrates through the fixed wall 58 of the processing tank 57, it is necessary to attach a seal 66 to the arm 63. A bending moment acts, and the deformation of the arm 63 lowers the positioning accuracy of the lower wire guide 65, adversely affecting the processing accuracy.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a wire electric discharge machine capable of assembling the entire machine at low accuracy with high accuracy and improving the positioning accuracy of a wire guide.

[0010]

In order to solve the above-mentioned problems, a wire electric discharge machine according to the present invention has a table on which a work is placed on a bed, and a fixed wall and a lifting wall around the table. A processing tank is provided, and the saddle is supported on the bed outside the processing tank so as to be movable in the direction parallel to the fixed wall, and a long hole is formed in the fixed wall in the moving direction of the saddle. Provide an exposed part exposed in the processing tank via the, a seal member that seals the long hole in the exposed part, install the slider on the saddle so that it can move in the direction orthogonal to the saddle movement direction, and install it in the saddle The lower arm is provided so as to be movable in the same direction as the slider, one end of the lower arm is penetrated through the exposed portion of the saddle, introduced into the processing tank, and a lower wire guide for guiding the lower end of the wire electrode is provided at the introduction end, Saddle upper arm on slider Placed to be movable in the same direction, a vertically movable supporting the head the upper arm, and provided with an upper wire guide for guiding the upper end of the wire electrode to the head.

According to the above configuration, since the lower arm is provided inside the saddle, the number of moving bodies on the saddle is reduced to three: the slider, the upper arm, and the head, and the entire machine has low rigidity. It consists of. In addition, since the seal member is attached to the exposed part of the saddle, the sliding resistance of the seal member is received by a highly rigid saddle, the bending moment acting on the lower arm is reduced, and the deformation of the lower arm during saddle movement is suppressed. In addition, the positioning accuracy of the lower wire guide can be improved.

The wire electric discharge machine according to the present invention is preferably configured such that upper and lower wire guides for guiding a wire electrode can be relatively moved. As means for that purpose, a rail for guiding the lower arm is provided in the saddle, the lower end of the bracket is fixed to the lower arm, means for driving the lower arm is installed on the slider, and the upper end of the bracket is mounted on the output shaft of the driving means. It is connected (claim 2). When machining the conical surface of the workpiece, the lower arm is driven by the driving means via the bracket, and the lower wire guide on the lower arm is relatively moved with respect to the upper wire guide on the slider side.

Further, as another relative moving means, a member for slidingly guiding the lower arm is provided on the exposed portion of the saddle, the lower end of the bracket is fixed to the lower arm, and a common rail for the slider and the bracket is provided on the saddle. Alternatively, a means for driving the lower arm may be provided on the slider, and the upper end of the bracket may be connected to the output shaft of the driving means. in this case,
Since the lower arm and slider are guided by a common rail, the number of rails is reduced, the rails are assembled with high precision in a precise positional relationship, the positioning accuracy of the upper and lower wire guides is improved, and high precision processing is possible. Becomes

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment of a wire electric discharge machine including the first and second aspects of the present invention, and FIG. 4 shows a second embodiment of a wire electric discharge machine including the first and third aspects of the present invention. 1 shows an embodiment. It should be noted that the present invention is not limited to these embodiments, and may be implemented by appropriately changing the shape and configuration of each part without departing from the spirit of the present invention. In addition, by driving the saddle and the bracket, the upper and lower wire guides can be driven simultaneously, and the movements of the U axis and the V axis can be superimposed.

As shown in FIGS. 1 to 3, in the wire electric discharge machine according to the first embodiment,
A hollow table 3 on which the work 2 is placed is installed, and a processing tank 4 is arranged around the table 3.
The processing tank 4 includes a fixed wall 5 and a bottom wall 6 fixed to the bed 1.
And a vertically U-shaped elevating wall 7 supported on the bed 1 so as to be able to elevate and lower. The elevating wall 7 is driven up and down via a rack 8 and a pinion 9 by a motor (not shown).

In the processing tank 4, the work 2 and the wire electrode 1 are provided.
A working liquid 11 for immersing the processing liquid 11 is stored therein, and an elevating wall 7 is provided with an overflow section 12 for determining a water level of the working liquid 11. The bed 1 is provided with a drainage channel 13,
The working fluid overflowing from the working tank 4 with the downward movement is collected in the drainage channel 13 and circulated and supplied to the working tank 4 by a working fluid supply device (not shown). In addition, a seal member (not shown) for preventing the leakage of the working fluid is interposed in a sliding contact portion between the lifting wall 7 and the fixed wall 5 and the bottom wall 6.

A saddle 15 is supported on the rear upper surface of the bed 1 outside the processing tank 4 by a rail 16 so as to be movable in the X-axis direction parallel to the fixed wall 5, and a ball screw 18 is driven by a motor 17 on the bed 1. Driven through. A long hole 19 that is long in the moving direction of the saddle 15 is formed in the fixed wall 5, and an exposed portion 20 that is exposed in the processing tank 4 through the long hole 19 is provided at the front end of the saddle 15. A seal member 21 that seals the elongated hole 19 is mounted on the outer periphery of the exposed portion 20 so as to slide on the inner surface of the fixed wall 5.

A slider 23 is mounted on the upper surface of the saddle 15 by a rail 24 so as to be movable in a Y-axis direction orthogonal to the fixed wall 5, and is driven by a motor 25 on the saddle 15 via a ball screw 26. Inside the saddle 15, a lower arm 27 is provided by a rail 28 so as to be movable in the same V-axis direction as the moving direction of the slider 23. The front end of the lower arm 27 penetrates through the sliding hole 29 of the exposed portion 20 and is introduced into the processing tank 4.
A seal member 30 for sealing a gap between the lower arm 27 and the lower arm 27 is mounted. A lower wire guide 31 for guiding the lower end of the wire electrode 10 is provided on the upper surface of the front end of the lower arm 27.

A motor 33 as a driving means of the lower arm 27
Is mounted on the slider 23. A bracket 34 is fixed to a middle portion of the lower arm 27 at a lower end, and an upper end of the bracket 34 is attached to a ball screw 35 which is an output shaft of the motor 33 by a nut 3.
6 are connected. When machining the conical surface of the work 2 or the like, the lower arm 27 is driven by the motor 33 in the V-axis direction via the bracket 34,
And the slider 23 are relatively moved.

An upper arm 38 is mounted on the upper surface of the slider 23 by a rail 39 so as to be movable in the same U-axis direction as the moving direction of the saddle 15.
Is driven through a ball screw 41, and the upper arm 38
Can be moved relative to the saddle 15. At the front end of the upper arm 38, a head 42 is attached to a rail 43.
, And is driven in the Z-axis direction by driving means (not shown) such as a motor according to the thickness of the work 2. An upper wire guide 44 for guiding the upper end of the wire electrode 10 is provided at the lower end of the head 42.

According to the wire electric discharge machine configured as described above, since the lower arm 27 is provided inside the saddle 15, the number of moving objects on the saddle 15 can be reduced by the slider 2.
3, the upper arm 38 and the head 42 to reduce the overall height of the machine and improve the rigidity of the entire machine structure. Also, four rails 1 for guiding the saddle 15, the slider 23, the lower arm 27, and the upper arm 38.
Since the rails 6, 24, 28, and 39 are disposed relatively close to each other, the rails can be assembled with a high positional accuracy in a precise positional relationship.

Further, the sealing member 2 slidably contacting the fixed wall 5
1 is mounted on the exposed portion 20 of the saddle 15, the sliding resistance of the seal member 21 can be received by the highly rigid saddle 15, thereby reducing the bending moment acting on the lower arm 27, and The deformation of the lower arm 27 during the movement of the lower wire guide 31 can be suppressed, and the positioning accuracy of the lower wire guide 31 can be improved. The sliding resistance of the seal member 30 attached to the end face of the exposed portion 20 is lower than the lower arm 27.
Therefore, the influence on the positioning accuracy of the lower wire guide 31 is extremely small.

The wire electric discharge machine according to the second embodiment shown in FIG. 4 differs from the first embodiment in the configuration of the support and drive mechanism of the lower arm 27. Here, a slide bearing 46 as a slide guide member is inserted into the exposed portion 20 of the saddle 15, and the front end of the lower arm 27 is slidably supported here. A T-shaped bracket 47 is fixed at a lower end to an intermediate portion of the lower arm 27, and a rail 24 common to the slider 23 and the bracket 47 is provided on an upper surface of the saddle 15. A motor 33 as a driving means of the lower arm 27 is provided on the slider 23, and an upper end of a bracket 47 is connected to a ball screw 35 as an output shaft thereof via a nut 36.

According to this configuration, since the lower arm 27 and the slider 23 are guided by the common rail 24,
The number of rails can be reduced by one as compared with the case of the first embodiment, and the rails can be assembled with higher accuracy in a more accurate positional relationship. Therefore, the lower wire guide 31 and the upper wire guide 4 for guiding the wire electrode 10 are provided.
The positioning accuracy of the workpiece 4 is improved, and the workpiece 2 can be processed with high precision.

[0025]

As described above in detail, according to the wire electric discharge machine of the present invention, the lower arm is incorporated in the saddle, the number of moving bodies on the saddle is reduced, and the whole machine is reduced in accuracy and high precision. In addition to being able to assemble, the sealing member is provided on the saddle side, reducing the bending moment acting on the lower arm, suppressing the deformation of the lower arm, and improving the positioning accuracy of the wire guide. Play.

[Brief description of the drawings]

FIG. 1 is a partially broken side view showing a first embodiment of a wire electric discharge machine according to the present invention.

FIG. 2 is a partially omitted front view of the electric discharge machine.

FIG. 3 is a partially omitted plan view of the electric discharge machine.

FIG. 4 is a partially broken side view showing a second embodiment of the wire electric discharge machine of the present invention.

FIG. 5 is a schematic side view of a conventional wire electric discharge machine.

FIG. 6 is a schematic plan view of the electric discharge machine.

FIG. 7 is a schematic front view of the electric discharge machine.

[Explanation of symbols]

1. Bed, 2. Work, 3. Table, 4.
Processing tank, 5 fixed wall, 7 elevating wall, 10 wire electrode, 15 saddle, 19 long hole, 20 exposed part, 21 seal member, 23 slider, 27・ ・
Lower arm, 28 rail, 31 lower wire guide, 33 motor, 34 bracket, 38 upper arm, 42 head, 44 upper wire guide,
46 ・ ・ Slide bearing, 47 ・ ・ Bracket.

Claims (3)

[Claims] 1. A wire electric discharge machine for performing electric discharge machining by relatively moving a wire electrode and a work, in which a table on which a work is placed is placed on a bed, and a fixed wall and a lifting wall are provided around the table. A tank is arranged, the saddle is supported on the bed outside the processing tank so as to be movable in a direction parallel to the fixed wall, a long hole is formed in the fixed wall in the moving direction of the saddle, and the saddle is inserted through the long hole. Provide an exposed part to be exposed in the processing tank, attach a sealing member to seal the long hole in the exposed part, install the slider on the saddle so that it can move in the direction orthogonal to the direction of movement of the saddle, and place the lower arm in the saddle Is provided so as to be movable in the same direction as the slider, one end of the lower arm penetrates through the exposed portion of the saddle and is introduced into the processing tank, and a lower wire guide for guiding the lower end of the wire electrode is provided at the leading end of the lower arm. To the upper arm A wire electric discharge machine in which the head is movably mounted in the same direction as the dollar, the head is supported on the upper arm so as to be able to move up and down, and the head is provided with an upper wire guide for guiding the upper end of the wire electrode. 2. A rail for guiding a lower arm in a saddle, a lower end of a bracket is fixed to the lower arm, a means for driving the lower arm is installed on a slider, and an upper end of the bracket is connected to an output shaft of the driving means. The wire electric discharge machine according to claim 1. 3. A member for slidingly guiding the lower arm is provided on an exposed portion of the saddle, and a lower end of the bracket is fixed to the lower arm.
2. The wire electric discharge machine according to claim 1, wherein a common rail is provided for the slider and the bracket on the saddle, a means for driving the lower arm is provided on the slider, and an upper end of the bracket is connected to an output shaft of the driving means.