JPS6218294B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrode for electric discharge machining and an improvement in a manufacturing method thereof.

In order to perform drilling and die-sinking by conventional electric discharge machining, it is first necessary to prepare an electrode having the desired shape. However, this electrode forming required skill and effort, and it was difficult to obtain high precision electrodes, making electrical discharge machining difficult. In addition, to increase the machining speed, it is necessary to jet the machining fluid into the machining gap, and for this purpose, a jet hole is usually formed in the center of the electrode to flow the machining fluid from the center of the machining gap to the periphery of the gap. However, when the machined surface of the electrode is expanded, the process liquid does not spread uniformly over the entire gap.

The present invention was proposed in order to improve this point, and is constructed using multiple pipe electrodes, and the multiple pipe electrodes are laminated and deformed by pressure pressing without leaving any gaps. The pipe electrodes are combined and formed into a desired shape so that the holes in each pipe electrode do not disappear so that they can be used as machining fluid jet holes.

The present invention will be explained below with reference to one example. In FIG. 1, numeral 1 denotes a mold, the cross section of which is shown, and a plurality of pipe electrodes 2a, 2b, 2c, . . . , whose cross sections are shown inside the mold.
...For example, pipes made of electrode material for electrical discharge machining, such as copper, brass, nickel, or iron, are stacked and inserted.
3 is a pressurizing punch that fits into the mold, and pressurizing is performed by a cylinder 4.

Pipe electrode 2 stacked by pressing with punch 3
a, 2b, 2c . At this time, the press force is controlled to such an extent that the pores in the pipe do not disappear due to compression deformation. Through this molding, the round pipe electrodes 2a, 2
b, 2c... are compressed and deformed into a rectangular shape such as a square or triangle. After forming, the punch 3 is removed and the formed electrode is taken out. An electrode for electric discharge machining having a rectangular cross section as shown in FIG. 2 is obtained.

In Fig. 3, pressing is performed using a mold 5 of an irregular shape, and a pressurizing punch 6 is used for the above-mentioned pressurizing cylinder, an impact pressure generating device such as a gunpowder explosion or discharge pressure, or other pressurizing device such as a vibrating press. They are connected and molded by applying the required pressure. Multiple pipe electrodes 2a, 2
b, 2c, . . . are inserted into a mold, laminated, and press-molded using a punch 6. In this case as well, the pipes 2a, 2b, 2c... are pressed together and deformed,
It is pressed onto the wall of the mold 5 and molded. If the press forming force is low, some gaps will be left between each pipe, but if the pressure is high, the pipes will be crimped together without leaving any gaps.

However, in any case, pressure molding is carried out to the extent that the holes in each pipe do not collapse and disappear, and the integrally molded electrode becomes as shown in FIG.

In addition, when molding the electrodes in FIGS. 1 and 3, each pipe electrode 2a, 2b, 2 stacked in the mold
It is effective to apply adhesive to c... Adhesives used include synthetic resin adhesives and conductive adhesives made of synthetic resin mixed with metal powder.The adhesive acts as a lubricant during pressure molding, improving moldability and improving bonding strength. and strengthen the bond. Further, press molding may be carried out under reduced pressure and in a heated state to effect diffusion bonding between the pipes, or strong bonding may be effected using heated solder, silver solder, or the like.

In the present invention, as described above, it is possible to easily obtain a molded electrode with a desired shape, and to obtain an integrated electrode by crimp-deforming each pipe of the material, the end face, which is almost perpendicular to the stacking direction of the pipe electrode, is aligned with the processed surface. By performing electric discharge machining as a method, it is possible to perform highly accurate machining that eliminates the drawback that machining remains between pipes when performing electric discharge machining, which occurs when performing electric discharge machining using conventional electrodes in which a large number of pipe electrodes are arranged. In addition, the holes in the material pipe electrode remain in the formed electrode without being crushed, so if you use this to create a jet of machining fluid, the machining fluid will be divided into each pipe electrode and will cover the entire electrode machining surface. The machining fluid can flow uniformly, the machining debris removal effect is improved, and the machining speed can be increased through stable electrical discharge machining.

Note that the electrode is also effective as an electrode that has a simple shape and is shaped using NC control or copying control.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of one embodiment of the present invention, Fig. 2 is an explanatory diagram of its molded electrode, and Fig. 3 is an explanatory diagram of another embodiment.
FIG. 4 shows the shaped electrode. 1 and 5 are molds, 3 and 6 are punches, 2a, 2
b, 2c are pipe electrodes, 4 is a press device.

Claims (1)

[Scope of Claims] 1. Consisting of a plurality of pipe electrodes, each pipe electrode is stacked and bonded by compression deformation without leaving a gap, and the outer shape is formed into a desired shape, and the voids in each pipe electrode are formed into a desired shape. An electrode for electrical discharge machining, which is formed without disappearing, and whose end face is substantially perpendicular to the stacking direction of the pipe electrode as the machining surface. 2 Using a mold with the desired shape, insert a plurality of pipe electrodes into the mold in a stacked manner, and press to deform the pipe electrodes to the extent that no voids are left between the pipe electrodes and the holes in each pipe electrode do not disappear. A method of manufacturing an electrode for electrical discharge machining, which is characterized by integrally bonding and molding. 3. The method of manufacturing an electrode for electric discharge machining according to claim 2, wherein a binder is interposed between each pipe electrode.