JPS62218025A - Electric discharge machine - Google Patents

Abstract

PURPOSE:To prevent a drop of cut off products, by furnishing support plates moved by a cylinder to hold both ends of a material to be worked at the lower side of the both ends of the material, and at the same time, furnishing a product support unit moved by another cylinder at the lower central side. CONSTITUTION:First, a material 12 to be worked is held by supporting plates 30 and 34, and a product A is cut off by a wire electrode. When products B to E are cut off and formed, an end of the material to process 12 is held by the supporting plate 30 and clamp members 32a and 32b, the supporting plate 34 is deformed by a cylinder 36, and the other end of the material 12 and the product A are held by the plate 34. Then, a product support unit 46 is moved by a delivery cylinder 48 under the products B to E to be produced from the material 12, and the product B is begun to cut off. By such plural supporting means, the products A to E cut off by the wire electrode will not drop, and are prevented from generating damages.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric discharge machining apparatus, and more particularly, an electric discharge machining apparatus that cuts and forms a product from a workpiece by generating an arc discharge between a wire electrode and a workpiece. The invention relates to an electric discharge machining apparatus configured to support the workpiece from the lower surface thereof by a plurality of supporting means that move up and down according to the cutting position of the wire electrode, thereby preventing the cut product from falling. .

Electrical discharge machining equipment is used when machining materials that are difficult to machine or when forming products with complex shapes. This electric discharge machining apparatus melt-processes a workpiece by generating an arc discharge between a machining electrode and the workpiece. In this case, a wire electrode is usually used as the processing electrode, and by moving the workpiece side or the wire electrode side with the wire electrode inserted through the plate-shaped workpiece, Processed materials are cut to form products.

By the way, the wire electrode is held by an upper electrode arm disposed on the upper surface of the workpiece and a lower electrode arm disposed on the lower surface of the workpiece.
The workpiece must be supported in such a manner that movement of the upper electrode arm and the lower electrode arm is not hindered. This is to prevent the workpiece formed by the lid from hanging due to its own weight as the cutting process progresses or to cause processing deformation, and to ensure sufficient processing accuracy.

Therefore, as a support means for the workpiece material,
There is one disclosed in No. 134520. In this case, the workpiece is configured such that two opposing sides of its peripheral edge are supported by support stands, respectively. However, with such support means, there is a risk that the product cut by the wire electrode may fall and break the lower electrode arm, or the product may be deformed or other problems.

Further, there is another support means disclosed in Japanese Patent Application Laid-Open No. 58-94918. In this case, a magnet is attached to the surface of the workpiece before processing, and the attractive force of the magnet prevents the product cut by the wire electrode from falling.

However, in this case, a large number of magnets must be placed on the workpiece in advance, which is extremely troublesome work, and if the product cut from the workpiece is heavy, There may be cases where such support becomes impossible. In addition, the work of attaching the magnet to the workpiece must be done manually by a worker, and this poses a drawback that prevents automation of processing work on the workpiece.

The present invention has been made to overcome the above-mentioned disadvantages, and is an electrical discharge machining apparatus that cuts and forms a product from a workpiece by generating an arc discharge between a wire electrode and the workpiece. A plurality of supporting means that move up and down toward the workpiece are disposed on the lower surface of the workpiece, and the support means are selectively biased to support the workpiece. It is an object of the present invention to provide an electrical discharge machining device that can prevent a product cut from a material from falling, eliminate damage to the device or the product, and obtain a product with excellent precision.

In order to achieve the above object, the present invention provides an electrical discharge machining apparatus for cutting and forming a product from a workpiece by generating an arc discharge between a wire electrode and the workpiece. A plurality of support means that can be raised and lowered to support the lower surface of the workpiece according to the position of the wire electrode (iiff L/, the support means are selectively energized to support the product obtained from the workpiece) It is characterized by being configured to do so.

Next, preferred embodiments of the electric discharge machining apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates a main body of the electric discharge machining apparatus according to the present invention, and this main body 10 has an electrode arm 14 for cutting a plate-shaped workpiece 12 by arc discharge, and an electrode arm 14 for cutting a plate-shaped workpiece 12. It basically consists of a first support mechanism 16 that supports the workpiece 12 and a second support mechanism 18 that supports the product formed from the workpiece 12.

The electrode arm 14 has an upper electrode arm 20 and a lower electrode arm 22 arranged symmetrically on the upper and lower surfaces of the workpiece 12, and is configured to be movable in the directions of arrows X and Y shown in FIG. be done. Here, a wire electrode 26 is supplied from the upper electrode arm 20 via a guide member 24, and this wire electrode 26 is wound up by the lower electrode arm 22 via a guide member 28. Note that a negative voltage is applied to the wire electrode 26 from the electrode arm 14 side. Further, the workpiece 12 has one end placed on the support plate 30 and a pair of clamp members 32a, 32b.
A positive voltage is applied to this workpiece 12 from the support plate 30 .

On the other hand, a first support mechanism 16 is provided on the other end side of the workpiece 12 . This first support mechanism 16
The cylinder rod 38 of the cylinder portion 36 is connected to the support plate 34 via a connecting plate 40 and a reinforcing rib 42. 34. Note that both sides of the support plate 34 are supported by guide members 44 a and 44 b disposed along both sides of the workpiece 12 , and the cylinder portion 36 is supported by a support base 43 .

A lower electrode arm 22 constituting the electrode arm 14 is disposed on the lower surface side of the workpiece 12, and a second support mechanism 18 for supporting the workpiece 12 is also disposed. In this case, the second support mechanism 18 includes 20 cylinder parts A,
It includes a product support unit 46 having an angle of A2° to A2° and a moving cylinder portion 48 that displaces the product support unit 46 in the direction of arrow X.

The cylinder portions AI to A2° are connected at predetermined intervals by a connecting plate 50, while the cylinder rod 52 of the moving cylinder portion 48 is attached to the connecting plate 50 via a connecting member 54. Further, each cylinder rod B1 to ago of cylinder parts AI to A2° is configured to be able to be displaced in the direction of arrow Z toward the lower surface of the workpiece 12, and support plates CI to CZO are attached to the upper end thereof. be done. Here, the connecting plate 50 of the product support unit 46 is supported by the guide rail 55, and the moving cylinder part 48 is supported by the support base 43.

Note that the operations of the electrode arm 14, the first support mechanism 16, and the second support mechanism 18 are controlled by the control unit 56.

That is, in FIG. 3, the control unit 56 controls the products A to G.
an input port 58 to which shape data is supplied, a ROM 60 that stores a predetermined control program, a RAM 62 that stores the shape data, and a CPU 64 that performs input/output control according to the control program stored in the ROM 60; The output capacitor 70 supplies control signals from the CPU 64 to the driver 66 and the sequencer 68. Here, the driver 66 moves the electrode arm 14 to the product A.
According to the shape data of the electrode arm 14, the sequencer 68 displaces it in the directions of arrows X and Y according to the shape data of the electrode arm 14.
This is to control the drive of ゜.

The electrical discharge machining apparatus according to the present invention is basically constructed as described above, and its operation and effects will be explained next.

First, both ends of the workpiece 12 are supported by the support plates 30 and 34, and the product A is cut by the wire electrode 26. In this case, the product A is prevented from falling by the product support unit 46 during cutting.

Next, the case of cutting and forming the products B to E from the workpiece 12 will be explained. In this case, one end of the workpiece 12 is held by the support plate 30 and the clamp members 32a, 32b, and the other end of the workpiece 12 and the product A are supported by the support plate 34. That is,
The cylinder portion 36 constituting the first support mechanism 16 displaces the support plate 34 in the direction of arrow X via the cylinder rod 38 based on a command from the sequencer 68. As a result, the support plate 34 supports the other end of the workpiece 12 and the product cut by the wire electrode 26 on the other end side. Note that the moving cylinder portion 4 of the second support mechanism 18
8 displaces the cylinder rod 52 in the direction of arrow X based on a command from the sequencer 68, and moves the product support unit 46 to the lower part of the products B to E to be obtained from the workpiece 12. The state at this time is shown in FIGS. 1 and 2.

On the other hand, the electrode arm 14 is moved by the driver 66 to the cutting start point P of the product B. Therefore, the product support unit 46 and the workpiece 1 moved to the lower part of the products B to E
A lower electrode arm 22 is sandwiched between the lower electrode arm 2 and the lower electrode arm 22. Therefore, the sequencer 68 receives the position data of the lower electrode arm 22 from the CPU 64 via the output port door 0, and based on the data, the cylinder rod of the cylinder portion A to A2° corresponding to the position of the lower electrode arm 22 described in 1iif is B, or B2° is lowered in the direction of arrow Z. As a result, the workpiece 12 is attached to the support plates C3 to C2 of the cylinder portions A1 to A2 degrees other than the portion where the lower electrode arm 22 is present.
It will be supported by ゜.

Next, the cutting operation of product B is started from the above state. Therefore, when a high voltage is applied between the wire electrode 26 stretched between the upper electrode arm 20 and the lower electrode arm 22 and the workpiece 12, the workpiece 12 is affected by arc discharge generated by the high voltage. As a result, a portion close to the wire electrode 26 is melted. And electrode arm 1
4 in the directions of arrows X and Y under the driving action of the driver 66, the product B is cut. That is, the control unit 56 outputs a control signal from the CPU 64 to the driver 66 via the output port door 0 in accordance with the control program in the ROM 60 based on the shape data of the product B previously stored in the RAM 62 via the input port 58. The driver 66 moves the electrode arm 14 in a predetermined direction based on this control signal to cut the product B.

Here, it is assumed that the product B is cut by the wire electrode 26 from the cutting start point P in the direction of the arrow. In this case, prior to the cutting operation of the product B, the support plate C5 corresponding to the starting point P of the lower electrode arm 22 is lowered in the direction of arrow Z by the cylinder portion A based on a command from the sequencer 68. Therefore, when the electrode arm 14 starts cutting in the direction of the arrow and the lower electrode arm 22 moves to the position of the support plate C2, the cylinder rod B1 of the cylinder portion A1 is driven based on the command from the sequencer 68, and the support plate C3 is covered. The workpiece 12 is supported, while the support plate C2
is lowered in the direction of arrow Z under the driving action of cylinder portion A2. In this way, the cylinder parts A1 to A8 are sequentially driven based on the commands from the sequencer 68, and each of the support plates C1 to C
, support the product B without interfering with the lower electrode arm 22. Thereafter, cutting of products C to E is performed in the same manner.

As described above, the product A is supported by the support plate 34 constituting the first support mechanism 16, and the products B to E are supported by the support plates C1 to C2 of the product support unit 46 in the second support mechanism 18. Therefore, when the electrode arm 14 is cut by the wire electrode 26, the products A to E will not fall, and there is no possibility that the products A to E or the lower electrode arm 22 will be damaged.

Next, when the cutting work of products A to E is completed, the support plate 34 and the second support mechanism 18 that constitute the first support mechanism 16 are
The product support unit 46 moves to the lower surfaces of the products F and G together with the electrode arm 14. Then, similar to the case described above, the cutting work of products F and G is performed.

In addition, in the embodiment described above, the support plate 3 of the first support mechanism 16
4 and the product support unit 46 of the second support mechanism 18 support the workpiece 12 and cut the product. It is also possible to prevent the products A to G from falling by using the unit 46 alone. Furthermore, if the support plate 34 of the first support mechanism 16 is set to a length that supports the entire lower surface of the workpiece 12, it is possible to simultaneously transport the products A to G cut by the electrode arm 14. becomes.

As described above, according to the present invention, in the electric discharge machining apparatus that cuts and forms a product from the workpiece by generating an arc discharge between the wire electrode and the workpiece, the lower surface of the workpiece is The wire electrode is supported by a plurality of support means that move forward and backward depending on the processing position of the wire electrode. Therefore, the product cut by the wire electrode will not fall, the product will not be damaged, and the device will not be damaged by the product. In addition, since the support means supports the workpiece from its lower surface, even if the workpiece is temporarily placed or the workpiece is quite heavy, the product itself is prevented from hanging, which impairs processing accuracy. It can be supported without fail. Furthermore, since the support portion of the workpiece by the support means is automatically set based on the shape data of the product, there is an advantage that manual labor can be significantly reduced.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments, and various improvements and changes in design can be made without departing from the gist of the present invention. Of course.

[Brief explanation of drawings]

FIG. 1 is a side cross-sectional configuration diagram of an electric discharge machining apparatus according to the present invention, FIG. 2 is a plan configuration diagram of an electric discharge machining apparatus according to the present invention, and FIG. 3 is a control section of the electric discharge machining apparatus according to the present invention. It is a block diagram. lO...Main body part 12...Workpiece material 14
... Electrode arm 16.18 ... Support mechanism 2
0... Upper electrode arm 22... Lower electrode arm 26... Wire electrode 30. 34... Support plate 36... Cylinder part 46... Product support unit 48... Cylinder part 56...・Control unit 6
6... Driver 68... Sequencer A1
~A2゜...Cylinder part C+ "Cz...Support plate

Claims (4)

[Claims] (1) In an electrical discharge machining device that cuts and forms a product from the workpiece by generating an arc discharge between a wire electrode and the workpiece, the workpiece is machined according to the position of the wire electrode with respect to the workpiece. An electrical discharge machining apparatus comprising a plurality of support means that support the lower surface of the workpiece and are movable up and down, the support means being selectively biased to support a product obtained from the workpiece. . (2) In the apparatus according to claim 1, the wire electrode is held by an upper electrode arm disposed on the upper surface of the workpiece and a lower electrode arm disposed on the lower surface of the workpiece. An electric discharge machining apparatus in which a workpiece is supported by a plurality of supporting means without interfering with the lower electrode arm. (3) In the apparatus according to claim 1, the supporting means includes a first support mechanism that moves in sliding contact with the lower surface of the workpiece, and a second support mechanism that advances and retreats toward the lower surface of the workpiece. An electrical discharge machining device consisting of. (4) An electric discharge machining apparatus according to claim 1, wherein the supporting means is constituted by a cylinder mechanism.