JPS5937175B2 - Wire cut electrical discharge machining equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to a wire-cut electric discharge machining apparatus.

In general, a wire-cut electric discharge machining device is widely used as an electric machining device that can perform cutting die machining with high precision and tape control. In this device, a wire with a small diameter is gradually wound up and used as one electrode, while the workpiece is used as the other electrode, a voltage is applied between these two electrodes, and a machining fluid is jetted out. The object to be machined is machined by generating a pulse discharge between both electrodes. However, when using this device to process a workpiece whose cross section is partially tapered, the machine must be machined while changing the inclination of the wire, or the table that supports the workpiece must be driven three-dimensionally. As a result, the drive mechanism and its control device become complicated, resulting in high manufacturing costs.
As another method, if a separate electrical discharge machining device is finally used for only the tapered portion, there are problems such as low workability due to movement of the workpiece between devices. An object of the present invention is to enable one wire-cut electrical discharge machining device to also perform normal electrical discharge machining, and by replacing the electrode part of one electrical discharge machining device, wire-cut electrical discharge machining and normal electrical discharge machining can be performed. Even when machining a workpiece with a partially tapered cross-section, it eliminates the need for a complicated drive mechanism and spooling device, and also requires two separate electrical discharge machining machines. The object of this invention is to eliminate the need for a device and solve the problems of the conventional type described above.

In the present invention, a voltage is applied between a moving wire electrode and a workpiece electrode, a machining liquid is jetted, and a pulse discharge is generated between the wire electrode and the workpiece electrode. A wire-cut electric discharge machining device for machining a workpiece, comprising a pair of guides, a first nozzle that can be attached to one of the guides, and a machining electrode support that can be attached to one of the guides by replacing the first nozzle. equipment, and
It is characterized by comprising a second nozzle attached to the other side of the guide, whereby electric discharge machining using the machining electrode can be performed subsequent to wire cut electric discharge machining using the wire electrode. A wire cut electric discharge machining apparatus is provided.

Embodiments of the present invention will be described below with reference to the drawings. Figure 1A
- FIG. 1C is a machined sectional view showing an example of a workpiece to be machined by the wire cut electric discharge machining apparatus of the present invention, and FIG. 1A is a cylindrical workpiece 1 having a tapered inner surface;
FIG. 1B shows a cylindrical workpiece 2 having a partially tapered inner surface, and FIG. 1C shows a cylindrical workpiece 3 with a stepped inner surface. When processing such a workpiece,
First, it is machined into a cylindrical shape including the one-dot chain line portion by wire cut electric discharge machining, and then it is machined into the shape of the diagonal line portion by ordinary electric discharge machining. A device that performs such processing will be described below. FIG. 2 is a front view of a wire cut electrical discharge machining apparatus as an embodiment of the present invention. A workpiece 10 serving as one electrode is fixed to an XY table 11, and the drive of the XY table 11 is controlled by a numerical controller 12.

The wire 20 as another electrode is connected to guide rollers 21, 21' and guides 23, 23' arranged in a support frame 25.
It is supported by and gradually moves.
The voltage of the machining power supply 13 is applied between these two electrodes, which generates a pulse discharge between the two electrodes.
0 is processed. In this case, the wire 20 is connected to the electrode pin 22
, 22' to one terminal of the machining power supply 13. During electrical discharge machining, machining fluid is supplied to the nozzles 24, 24' from a machining fluid treatment tank (not shown) as shown by arrows 14, 14'. Liquid is being sprayed. When a predetermined wire cut electric discharge machining is completed, the nozzle 24 is removed and a machining electrode support device for performing normal electric discharge machining is attached. Third
This figure is a front view showing a state in which the upper nozzle in the wire cut electric discharge machining apparatus shown in FIG. 2 has been replaced with a machining electrode support device.

A machining electrode 31 is attached to the machining electrode support device 30 , and the machining electrode 31 is connected to one terminal of the machining power source 13 . Pulse discharge is performed between the workpiece 10 and the machining electrode 31, which serve as two electrodes, thereby applying force to a special shaped part of the workpiece 10 such as a tapered shape or a step.

In this case, the center of the processing electrode 31 is the wire 20 before replacement.
(FIG. 2), therefore, the NC tape for the numerical control device 12 can be made in the same way as for the wire 20, with only the offset amount changing. Note that during electrical discharge machining, for example, two nozzles 33,
34 is brought close to above the machining electrode 31, and machining fluid is jetted from a machining fluid treatment tank (not shown) as shown by arrows 33' and 34', and the nozzle 24 is also directed from below.
Processing fluid is jetted from '. Further, in order to prevent uneven wear of the machining electrode 31 due to electrical discharge machining, the machining electrode 31 is rotated. Hereinafter, the rotation mechanism of the processing electrode 31 will be explained with reference to FIGS. 4 and 5.
FIG. 4 is a detailed view of the peripheral area of the processing electrode shown in FIG. 3, in which the processing electrode is rotated by a drive device.

The processing electrode 31 is mounted on a holder 4 supported by bearings 45 and 46.
It is held by 7. This holder 47 is rotated by a drive motor 41. In this case, the pulley 42 rotates together with the drive motor 41, and this rotation is caused by the belt 4
3 to the pulley 44, thereby rotating the holder 47. In this way, the processing electrode 31 is rotated by the drive device. FIG. 5 is also a detailed view of the vicinity of the machining electrode of FIG. 3, and unlike FIG. 4, a water wheel 51 is provided which rotates with the flow of machining fluid.

When the machining fluid flows from the machining fluid treatment tank (not shown) as shown by the arrow 14, the water wheel 51 rotates, and the holder 5, on which the machining electrode 31 is attached, is supported by the bearing 52.
3 rotates. In this way, the machining fluid used during wire cut electric discharge machining is used to obtain a rotational power source for the machining electrode 31. In addition, Fig. 1A to Fig. 1C
Although a cylinder with a machined cross section having a tapered shape or a step on the inner surface side is shown in FIG. .

Furthermore, in Figures 2 and 3, the nozzle and the machining electrode support device on the upper side are shown to be interchangeable, but it is also possible to install both nozzles interchangeably and attach the machining electrode support device. . Furthermore, in FIG. 5, the water wheel 51 is driven by machining fluid, but the water wheel 51 can also be driven by other fluids, such as air. According to the present invention, even when the machined cross section has a special shape, for example, a part is tapered, manufacturing costs can be reduced without requiring a complicated drive mechanism and control device. This method does not require a second electric discharge machining device, and therefore there is no movement of the workpiece between devices, improving workability and helping to solve the problems of the conventional type described above.

[Brief explanation of the drawing]

1A to 1C are machined cross-sectional views showing examples of workpieces machined by the wire-cut electric discharge machining apparatus of the present invention, and FIG. 2 is a front view of the wire-cut electric discharge machining apparatus as an embodiment of the present invention. Figure 3 is a front view showing the state when the upper nozzle in Figure 2 is replaced with a machining electrode support device, and Figure 4 is a detailed part showing an example of the peripheral area of the machining electrode in Figure 3. 5 is a detailed partial sectional view showing another example of the peripheral area of the processing electrode shown in FIG. 3. (Explanation of symbols), 1, 2, 3, 10... workpiece, 11... XY table, 12...
Numerical control device, 13... Processing power supply, 20...
... Wire, 21, 21'... Guide roller, 22, 22'... Electrode pin, 23, 23'.
...Guide, 24, 24'...Nozzle,
30, 3', 307... Electrode support device for processing,
31... Electrode for processing, 41... Drive motor, 47... Holder, 51... Water turbine, 53... Holder.

Claims (1)

[Claims] 1. Machining the workpiece by applying a voltage between the moving wire electrode and the workpiece electrode and causing a jet of machining fluid to generate a pulse discharge between the wire electrode and the workpiece electrode. In a wire-cut electric discharge machining apparatus, a pair of guides 23, 23', a first nozzle 24 that can be attached to one of the guides 23, and a machining that can be attached to one of the guides 23 by replacing the first nozzle. and a second nozzle 24' attached to the other 23' of the guide, thereby performing electric discharge machining using the machining electrode subsequent to wire cut electric discharge machining using the wire electrode. A wire-cut electrical discharge machining device characterized in that it is capable of performing wire-cut electrical discharge machining.