JPH0212682B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support device for a wire-cut electrical discharge machining apparatus, particularly for a machined portion of a workpiece.

In wire cut electric discharge machining, especially when machining thin plate materials, as the machining progresses, the cut parts on both sides of the machining groove bend, vibrate, or change position due to their own weight or hydraulic pressure, which can impede machining. There are cases. In order to prevent this, a method was used in which a bridge piece was placed across the machined groove and adhesive was applied to maintain the position of the cut part and prevent it from falling.
In addition, a method has been proposed in which the crosslinking piece is adsorbed onto the cut portion using a magnet piece. In this conventional method, the bridge pieces had to be adhered by following the machining trajectory, and the machining had to be stopped each time, making the work complicated and inefficient.

In view of the above-mentioned current situation, it is an object of the present invention to provide a workpiece support device that can be applied not only to extremely thin plate-like or extremely thin workpieces, but also to many other shapes.

In wire-cut electric discharge machining, the cut pieces or the workpiece may become bent, deformed, displaced, or fall downward as the machining progresses, impeding the machining action and reducing work efficiency. Or, in order to prevent deterioration of processing accuracy, during the wire cutting process, a suction force is applied to the contact that straddles the processing groove of the workpiece and the part of the workpiece outside or inside the contact. A magnet is provided extending from the support head of the wire electrode, and the processed portion of the workpiece is supported by the balance of the attractive forces of the contact and the magnet.

Next, the present invention will be explained by giving an example. FIG. 1 is a plan view of a workpiece 1 provided with a machining shape 9 and a groove 10 formed by wire-cut electric discharge machining using an electrode wire 11. 2 and 3 are side views showing the application of the present invention. In this case, a very thin groove 10 like the shape 9 is formed in an extremely thin steel plate, but the present invention can be applied to workpieces up to thick steel plates, and a wide variety of grooves can be formed. Other shapes can be attached. For convenience of explanation, the first
The embodiment shown in Figure A will be explained.

In one embodiment shown in FIG. 2, a wire electrode 11 is run on a workpiece 1 in the up and down arrow directions between guides 2 while maintaining a predetermined tension.
A machining groove 10A having a predetermined shape is formed on the workpiece 1 facing the
In order to form a cut by electric discharge machining, a machining feed of a predetermined shape is applied between the wire 11 and the workpiece 1 relative to each other, for example, as shown in FIG. 19. A contact 5 is extended and provided at the tip of the head 4 that supports the guide 2. The contactors elastically support the rollers 5A, 5B with springs 5C, 5D so as to be freely compressible, and bring the rollers 5A, 5B into contact across the processing groove 10A of the workpiece 1. A magnet 3 is a permanent magnet or an electromagnet, and is opposed to the workpiece portion outside the contactor 5 to apply an attractive force. Therefore, the workpiece in the processing portion maintains its position in a balanced manner by the attraction force of the magnet and the pressure contact of the contact, and is stably supported without bending or displacement.

Although a pair of contactors 5 and magnets 3 are provided symmetrically in the figure, if a pair is also provided in the front-rear direction, it is possible to support them across the processing groove even when the processing feed direction is changed at right angles. This allows for stable support at any given direction. In addition, since processing shape feed is usually under NC control, the NC
If a control device is provided to change the orientation of the support head 4 in the machining feed direction in response to a control signal, stable support can be always achieved by balancing the contact attraction force across the machining groove.

In this way, the guide 2, the wire 11, the head 4, and the contactor 5 magnet 3 supported by the head 4 are connected to the workpiece 1 while the wire 11 moves through the path 19 having a predetermined machining shape while cutting by electrical discharge machining. However, the workpiece 1 has magnets 3 on both sides of the processing groove 10A.
The wires face each other and are firmly supported by the attractive force of the magnetic poles 6A and 6B, so that even during the cutting process, there is no deformation, bending due to displacement, vibration, etc., and the wire can be cut in a stable predetermined shape until the end.

FIG. 3 shows another embodiment. As the discharge cut wire 11A, a roll 7A, an introduction guide 2A,
Wire 11B via lead-out guide 2B and roll 7B
or in the opposite direction, along a predetermined wire path. In addition, the wire 11 and the workpiece 1
In between, machining shape feed is applied by NC control or copying control, and a cut groove 10A of a predetermined shape is formed by electrical discharge machining. The workpiece 1 is fixed at both ends with support plates 8A and 8B.

During this cutting, the processing part of the workpiece 1 is
The workpiece 1 is suction-supported across the processing groove 10A by a support consisting of the magnet 3 and the contact 5 shown in the figure, and the rollers 5A and 5B at the tips of the contacts are in a state where they can freely slide on the workpiece 1. can be freely moved relative to the head 4. Therefore, the workpiece 1 during processing is stably and accurately machined without being displaced, bent, or vibrated in the machining groove 10A portion by the wire cut, and the workpiece 1 is
It is possible to carry out smooth and efficient processing without the relative movement being hindered by the magnetic support. This allows electrical discharge machining to proceed, maintains and improves machining accuracy, and improves work efficiency.

Note that the support made of the contact 5 and the magnet 3 can also be provided below the workpiece 1.

As already explained in the embodiments, if the device of the present invention is applied, the processing section can be more reliably supported with the workpiece than any conventionally known method, and the relative movement of the wire guide section can be prevented. This has the effect of allowing stable machining without any problems. This support can be applied to other processes and is versatile. This increases the speed of wire cutting, reduces troubles, saves NC labor, and improves product accuracy. In this way, by applying the device of the present invention, it is possible to completely prevent the processed cut pieces from falling.

[Brief explanation of drawings]

FIG. 1 is a plan view of an embodiment of discharge wire cut molding. 2 and 3 are both partially sectional side views of one embodiment of the present invention. 1... Workpiece, 2, 2A, 2B... Guide, 3...
Magnet, 6A, 6B... Magnetic pole, 4... Head, 5... Contact, 5A, 5B... Roller, 11, 11A, 11B
...Wire electrode, 19...Processing shape locus, 10,10
A... Machining groove.

Claims (1)

[Scope of Claims] 1. In an apparatus for performing wire-cut electric discharge machining on a workpiece using a wire electrode running between a pair of guides, the contact spans the machining groove of the workpiece and contacts the surface of the workpiece to position and hold the workpiece. A magnet is provided on a head that supports one of the guides, and a magnet is provided on the head to apply a magnetic attraction force that is in balance with the contact pressure of the contact, facing a surface portion of the workpiece on the outside or inside of the contact. Wire cut electrical discharge machining equipment.