JPH052819U - Electric discharge machine - Google Patents

Abstract

(57) [Summary] [Object] To obtain a small electric discharge machining apparatus having a low table height, high workability, and low machine height in an electric discharge machining apparatus that raises and lowers a machining tank by using a screw mechanism. [Structure] A nut of a screw is fixed to a processing tank, and the processing shaft is moved up and down by rotating a screw shaft.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention relates to an electric discharge machine.

[0002]

[Prior art]

  Fig. 4 shows that the conventional processing tank moves up and down, and the table surface plate on which the workpiece is mounted moves. FIG. 1 is a schematic side view showing a so-called table-fixing type die-sinking electric discharge machine. It In the figure, 1 is a head, 2 is a ram, 3 is a saddle, 4 is a column, 5 is a bed, and 6 is a te The table surface 7 is a processing tank that moves up and down. The electrode 8 constitutes the head 1. The work piece 10 is mounted on the electrode mounting surface plate 9 and the work piece 10 is mounted on the table surface plate 6, respectively. Has been. L1 is the height from the floor surface to the table surface 6, that is, the table height, L2 represents a distance from the table surface plate 6 to the electrode mounting surface plate 9, that is, a so-called face-to-face distance , L3 is the height of the head 1, H is the height from the floor surface to the upper surface of the head 1, Represents machine height,           H = L1 + L2 + L3 Have a relationship.

[0003]   FIG. 5 is a schematic cross-sectional view showing a conventional processing tank elevating mechanism, with the processing tank on the left side of the center line. Shows the state where it is raised to the upper limit, and the right side shows the state where it is lowered to the lower limit. 11 in the figure is a normal cylinder Cylinder polished to a shape, 12 is a seal surrounding the outer circumference of the cylinder 11. , 13 are seal housings for housing the seals 12, and 14 and 15 are processing tanks, respectively. It is a screw shaft / screw nut for raising and lowering 7. Screw shaft 14 turns in the height direction Both the rolling direction is fixed to the processing tank 7, and the nut 15 of the screw is the bearing of the nut. It is rotatably fixed to the bed 5 via 16. Also, 17 is a motion not shown. A sprocket for transmitting rotational movement from the force source to the nut 15 of the screw. It is fixed to the hood 15 in both the height direction and the rotation direction. L4 is bed 5 from the floor The distance to the top surface, that is, the bed thickness.

[0004]   Next, the operation and operation of the conventional technique will be described.   In FIG. 4, the saddle 3 moves on the column 4 in the X-axis direction shown in the figure. La The frame 2 moves on the saddle 3 in the Y-axis direction shown in the figure. Head including electrode mounting base 9 The drive 1 moves in the Z-axis direction shown in the figure. Therefore, the workpiece 10 does not move, The electrode 8 moves in the X, Y, and Z axis directions.

[0005]   The processing tank 7 can be moved up and down by a processing tank lifting mechanism as described below. It can be fixed at any height above and below. Processing tank 7 and table A machining liquid is supplied to a space formed by the board 6 from a machining liquid supply device (not shown). It While being immersed in the stored machining fluid, an electric discharge is applied between the electrode 8 and the workpiece 10. Work. To attach the workpiece 10 to the table surface plate 6, the processing tank 7 is lowered. In general, during electric discharge machining, the machining bath 7 is raised to store the machining liquid.

[0006]   In FIG. 5, when the rotary motion is transmitted to the sprocket 17, the sprocket 17 is fixed to the sprocket 17. The nut 15 of the screw rotates. On the other hand, the screw shaft 14 is fixed in the rotation direction. Then, thrust is generated on the screw shaft 14 by the principle of the screw. And screw nut 1 5 is fixed to the bed 5 by the bearing 16 of the nut, the screw shaft 1 4 can move up and down, and can raise and lower the processing tank 7 fixed to the screw shaft 14. Wear.

[0007]   In addition, the seal 12 ensures a tight seal between the cylinder 11 and the seal housing 13. Because it is kept closed, the table surface plate 6, cylinder 11, seal 12, seal If the machining liquid is supplied to the space surrounded by the housing 13 and the machining tank 7, the electric discharge machining It is possible to store the processing liquid required for the.

[0008]   FIG. 6 is a side view showing an electric discharge machining apparatus in which a machining tank is moved up and down, showing another conventional embodiment. Is. In the figure, 1 is a head, 2 is a ram, 3 is a saddle, 4 is a column, 5 is a bed, 6 Is a table surface plate, 7 is a processing tank that moves up and down, and 18 is a sub tank. Also, The electrode 19 is on the electrode mounting platen 20 that constitutes the head 1, and the work piece 21 is on the table. Each is attached to the board 6. Reference numeral 22 is a working fluid supply device. Illustrate However, it has a processing tank elevating device for vertically moving the processing tank 7.   Reference numeral 23 is a sealing portion for the working fluid, 24 is an outlet for the working fluid, 24 a is a drain valve, 25 Is a liquid level detection device such as a float switch.

[0009]   FIG. 7 is a cross-sectional view showing an example of a conventional working liquid seal portion 23, and FIG. FIG. 7B shows a state in which it is not sealed, and a state in which it is sealed. Figure 7 , 26 is packing, 27 is air piping, 28 is air control device, and 29 is A packing fixing plate, 6a is an end of a table surface plate, and 7a is a processing tank wall which moves up and down. It The packing 26 is a hollow elastic body such as nitrile rubber or fluororubber. I am using a tube. The packing fixing plate 29 is fixed to the table surface plate end 6a. ing. Further, the air pipe 27 is connected to an air control device 28. The air control device 28 is linked to a control device for the entire electric discharge machine (not shown). .

[0010]   FIG. 8 is a side view showing another embodiment of the conventional electric discharge machining apparatus in which the machining tank is moved up and down. is there. In the figure, 1 is a head, 3 is a saddle, 4 is a column, 5 is a bet, and 6 is a table. The plate, the electrode 19 is on the electrode mounting platen 20 that constitutes the head 1, and the work piece 21 is Each is attached to the table surface plate 6. Processing tank 7 (not shown) It has a processing tank elevating device for vertically elevating.

[0011]   Next, the operation and operation of the conventional technique will be described. In FIG. 6, the saddle 3 is The column 4 is moved in the X-axis direction shown in the figure. Ram 2 is shown above saddle 3 Move in the Y-axis direction. The head 1 including the electrode mounting surface plate 20 has a Z-axis direction shown in the drawing. Move to. The processing tank 7 is lifted up and down by a processing tank lifting device (not shown). It can be fixed and can be fixed at any position above and below. With processing tank 7 The machining fluid is supplied from the machining fluid supply device 22 to the space formed by the table surface plate 6. Then, the working liquid is stored by the seal portion 23. Whether the working fluid is full The liquid level detection device 25 determines. In the stored working fluid, the electrode 19 and the Electric discharge machining is performed with the workpiece 21. Mounting the work piece 21 on the table surface plate 6 The machining tank 7 is lowered, and the machining tank 7 is raised during electric discharge machining to store the machining liquid. It The stored machining liquid is discharged from the drain port 24 controlled by the drain valve 24a. Will be discharged. In addition, the amount of processing liquid stored in the processing tank 7 is stored in the liquid level detection device 25. Therefore, it is detected.

[0012]   Next, the operation of the seal portion 23 will be described. In FIG. 7, the packing 26 Compressed air flows from the air controller 28 through the air pipe 27 into the hollow portion. Then, the pressure in the hollow part of the packing increases. However, the packing 26 is the end of the table surface plate. It is sandwiched between 6a and the packing fixing plate 29, and the vertical deformation is restrained. There is. Therefore, when the internal pressure rises, the packing 26 is locked as shown in FIG. 7 (b). Expand the diameter in the unbundled direction. By this, the inner surface of the processing tank side wall 7a If the distance of the packing 26 is adjusted appropriately in advance, the air inside the hollow part of the packing 26 The packing 26 is pressed against the inner surface of the processing tank wall 7a by inflowing The processing liquid stored in the processing tank 7 can be sealed. did Therefore, the inner surface of the processing tank side wall 7a and the packing 26 do not come into contact with each other, It can be moved up and down, and when the processing liquid is stored inside the processing tank 7, the packing 26 can be pressed against the inner surface of the side wall 7a of the processing tank to seal the processing liquid.

[0013]   Next, the operation and operation of another embodiment of the conventional technique will be described. In FIG. , The saddle 3 moves on the bed 5 in the X-axis direction shown in the figure. Table 6 is sad It moves on the upper part of the rule 3 in the Y-axis direction shown in the figure. The head 1 including the electrode mounting surface plate 10 is It moves in the Z-axis direction shown in the figure. The processing tank 7b is mounted on a processing tank lifting device (not shown). Therefore, it can be extended and contracted up and down, so that it can be fixed at any position above and below It has become. In the space formed by the processing tank 7b and the table surface plate 6, the processing liquid is supplied. The working fluid is supplied from the feeder, and the sealing section 13 stores the working fluid. processing The liquid level detection device determines whether or not the liquid is full. In the stored working fluid At, the electric discharge machining is performed between the electrode 9 and the workpiece 21. Addition to the table surface 6 The workpiece 21 is attached by lowering the machining tank 7b, and the machining tank 7b is mounted during the electric discharge machining. Raise and store the working fluid.

[0014]

[Problems to be solved by the device]

  Since the conventional electric discharge machine shown in FIG. 4 is configured as described above, the machining tank 7 Is lowered to the lower limit, the screw shaft 14 jumps downward more than the nut 15 of the screw. Therefore, the bed thickness L4 cannot be reduced, and the table height L1 cannot be reduced. There was a problem that it could not be lowered. That is, a person manually touches the workpiece 10. Table height L1 is 900mm or less when considering mounting on the table. It is desirable to have a discharge tank that uses the conventional processing tank lifting mechanism. In the processing equipment, the table height L1 exceeds 1050 mm, resulting in poor workability. Was there.

[0015]   The conventional electric discharge machining device shown in FIG. 5 in which the machining tank for storing the machining fluid moves up and down is as described above. Configured and operated to support and guide the ram as it moves back and forth. Load applied to the guide that supports the guide and the guide that supports the saddle changes The ram moves to the column side and the direction in which the ram moves away from the column. When moving to, there is a problem that the head height changes and the processing accuracy is impaired. there were.

[0016]   This invention was made to solve the above problems, and To obtain a small electric discharge machine with a low height L1 and high workability and a low machine height H With the goal.

[0017]

[Means for Solving the Problems]

  The electric discharge machining apparatus according to the first invention uses a screw mechanism to raise and lower the machining tank. In the electrical processing equipment, fix the nut of the screw to the processing tank and rotate the screw shaft. The processing tank is moved up and down by.

[0018]   The electric discharge machining apparatus according to the second invention is an electric discharge machine in which a machining tank that stores machining fluid moves up and down. In the processing device, the saddle that holds the head is guided over the crown, Is a mechanical structure configured to be guided on a bed.

[0019]

[Action]

  The machining tank elevating means in the first invention fixes the screw nut to the machining tank, The processing tank is moved up and down by rotating the shaft.

[0020]   The electric discharge machining apparatus according to the second invention is an electric discharge machine in which a machining tank storing a machining fluid moves up and down. In the processing device, a saddle holding the head is guided on the crown.

[0021]

【Example】

Example 1.   An embodiment of the first device will be described below with reference to the drawings. Figure 1 shows the processing of this invention A schematic cross-sectional view showing the tank elevating mechanism. As with FIG. 5, the left side of the center line is the upper limit of the processing tank. The state is raised, and the right side is lowered to the lower limit. The nut 15 of the screw in the figure is high The screw shaft 14 is fixed to the processing tank 7 both in the direction of rotation and in the direction of rotation, and the screw shaft 14 is a bearing of the screw shaft. The bed 5 is rotatably fixed to the bed 5 via a guide 18. 19 is not shown A sprocket for transmitting rotational motion from the power source to the screw shaft 14, Fixed in both height and rotation directions.

[0022]   In FIG. 1, when the rotary motion is transmitted to the sprocket 19, the sprocket 19 is fixed to the sprocket 19. The screw shaft 14 rotates. On the other hand, the nut 15 of the screw is fixed in the rotational direction. Then, thrust is generated in the nut 15 of the screw due to the principle of the screw. And the screw shaft 1 4 is fixed to the bed 5 by the bearing 18 of the screw shaft, The table 15 moves up and down to move up and down the processing tank 7 fixed to the nut 15 of the screw. Can be made.

[0023]   In such a processing tank elevating mechanism, the screw shaft 14 has a minimum bed thickness L4. The bed thickness L4 can be reduced because it only affects the table. The height L1 can be reduced. As a result, the machine height H is also lowered. be able to.

[0024]   In the processing tank lifting mechanism of this invention, the screw shaft 14 is always attached to the bed 5 Although it has a structure that protrudes upward, processing is possible even with the conventional processing tank lifting mechanism. The situation is the same when the tank 7 is raised upward (to the left of the center line in FIG. 5). Therefore, the table height L1 does not become high.

[0025] Example 2.   In the above embodiments, the table surface plate on which the work piece is mounted does not move. Although the description has been given by taking an example of a table-fixing type die-sinking electric discharge machine. This is a so-called table-moving type die-sinking electric discharge machine that moves the bull surface plate. The idea can be applied and other types of electric discharge such as wire cut electric discharge machine It goes without saying that the present invention can be applied to a processing device.

[0026] Example 3.   Further, in the above embodiments, the rotation is transmitted by the sprockets 17 and 19. The method described above was taken as an example, but this is the power required to raise and lower the processing tank 7. Direct drive system, gear system, etc. However, it is not particularly limited.

[0027] Example 4.   An embodiment of the second invention will be described below with reference to the drawings. In FIG. 2, 1 is a head 3 for saddle, 29 for crown, 5 for bed, 6 for table surface plate, 11 for processing Numeral 7b is a processing tank, 9 is an electrode, and 10 is an electrode mounting platen.

[0028]   FIG. 3A is a schematic cross-sectional view showing the periphery of the processing tank 7b, and the left side shows the processing tank 7b below. The raised state, the right side is the state in which the processing tank 7b is raised to store the processing liquid and perform the processing. Is represented. 7b is made of a material or structure that is flexible and does not leak the working fluid. The side wall of the processing tank, 7c, represents the processing tank cover.

[0029]   FIG. 3B is a schematic cross-sectional view showing the periphery of the processing tank 7b, and the left side shows the processing tank 7b below. The raised state, the right side is the state in which the processing tank 7b is raised to store the processing liquid and perform the processing. Is represented. 7d is a machining tank 7b and a bed 5 which is a fixed part of the electric discharge machine main body. It is made of a stretchable material or structure.

[0030]   An embodiment of the present invention will be described below with reference to the drawings. In Fig. 2, the electrode mounting The head 1 including the board 10 moves in the Z-axis direction shown in the drawing. Saddle holding the head The ruler 3 moves on the crown 29 in the X-axis direction shown in the figure. Crown 29 It is configured to have sufficient rigidity for the weight of the Since there is no change in the load, the accuracy is maintained when moving the head in the left-right direction. You can move while doing. Also, the crown 29 is shown in the figure above the bed 5. Move in the Y-axis direction. Bed 5 has no change in load due to movement of crown 29, It is possible to move forward and backward while maintaining accuracy. Processing tank 7b, shown It can be lifted up and down with a processing tank lifting device that does not It can be fixed. In the space formed by the processing tank 7 and the table surface 6 The processing liquid is supplied from the processing liquid supply device, and the processing liquid is stored. Filled with working fluid Whether or not it is determined by the liquid level detection device. In the stored machining fluid, Electric discharge machining is performed between the pole 9 and the workpiece 11. Workpiece 11 on table surface plate 6 Is installed by lowering the machining tank 7, and during electric discharge machining the machining tank 7 is raised to To store.

[0031]   3 (a) and 3 (b), when carrying in the workpiece 11 or setting At the time of cutting, the processing tank 7 is lowered as shown in the left figure. This way Since the upper side of the bull platen 6 is opened, the workability is very good.

[0032]   When processing, depending on the height of the workpiece 11, as shown in the figure on the right The processing tank 7 is raised to an arbitrary height. And from the working fluid supply device 12, not shown A machining fluid is stored in the machining tank 7 by a piping system and electric discharge machining is performed. in this case, In FIG. 3 (a), processing is performed inside the region surrounded by the processing tank side wall 7b and the bed 5. The liquid is stored and surrounded by the processing tank 7, the connecting portion 7d and the bed 5 in FIG. 3 (b). The machining fluid will be stored inside the open area.

[0033]

[Effect of device]

  As described above, according to the first invention, the screw mechanism is used to raise and lower the processing tank. In the electric discharge machine, the screw nut is fixed to the machining tank and the screw shaft is rotated. The table height L1 is low because the processing tank is moved up and down. It is possible to obtain a small electric discharge machine with high workability and low machine height H. There is a fruit.

[0034]   According to the second invention, the head is held in the electric discharge machine in which the machining tank moves up and down. The saddle is guided on the crown, and the crown is guided on the bed. Since the mechanical structure is configured, processing accuracy is not impaired and the machine installation space is saved. There is an effect that it is possible to obtain an electric discharge machining device in which the machining tank that can be effectively used moves up and down.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a working tank elevating mechanism according to an embodiment of the first invention, in which the left side of the center line shows a state where the working tank is raised to an upper limit, and the right side shows a state where it is lowered to a lower limit.

FIG. 2 is a front view showing an electric discharge machine according to an embodiment of the second invention.

FIG. 3 is a cross-sectional view showing a machining tank seal portion of an electric discharge machine according to an embodiment of the second invention.

FIG. 4 is a schematic side view showing a conventional die-sinking electric discharge machining apparatus of a table fixed type in which a machining tank moves up and down and a table surface plate on which a workpiece is mounted does not move.

FIG. 5 is a schematic cross-sectional view showing a conventional processing tank elevating mechanism, in which the left side of the center line shows the state where the processing tank is raised to the upper limit, and the right side shows the state where it is lowered to the lower limit.

FIG. 6 is a side view showing an electric discharge machine according to an embodiment of a conventional electric discharge machine.

FIG. 7 is a cross-sectional view showing an example of a conventional working liquid seal portion 13.

FIG. 8 is a side view showing an electric discharge machine according to another embodiment of the conventional electric discharge machine.

[Explanation of symbols]

1 head 2 Ram 3 saddle 4 columns 5 beds 6 table surface plate 6a Table surface plate end 7 processing tank 7a Side wall of processing tank that moves up and down 7b Side wall of processing tank that expands and contracts vertically 8 sub tanks 9 electrodes 14 screw shaft 15 screw nuts

Claims (2)

[Scope of utility model registration request] 1. An electric discharge machining apparatus for raising and lowering a machining tank by using a screw mechanism, characterized in that a nut of a screw is fixed to the machining tank and the machining shaft is raised and lowered by rotating a screw shaft. apparatus. 2. In an electric discharge machining apparatus in which a machining tank for accumulating a machining fluid moves up and down, a saddle holding a head is guided on a crown, and the crown is guided on a bed. And electrical discharge machine.