JPS5871031A - Electric discharge machining device - Google Patents

Abstract

PURPOSE:To enable a work to be worked with a minimum capacity of a capacitor irresective of variation of opposed areas of an electrode and the work by inserting a current smoothing coil between the electrode or work and a conductive wire. CONSTITUTION:A current smoothing coil 11 is interposed between an electrode 1 and a minus side conductive wire 7 in a circuit of an electric discharge machining device. Current supplied from a DC power supply 4 is charged to a charging and discharging capacitor 6 and floating capacitors 9, 10 and discharged when the electrode 1 and a work 2 have a certain gap in a working liquid 3 and insultion therebetween is broken out. Here, energy stored in the charging and discharging capacitor 6 and the floating capacitor 9 of the current smoothing coil 11 and energy from the DC power supply 4 are gradually supplied to the electrode 1 and the work 2 so that the capacity size of the capacitor will be hardly affected.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrical discharge machining apparatus that applies current between a machining electrode and a workpiece and machines the workpiece with a machining fluid interposed therebetween.

Conventionally, this type of device is shown in Figure 1.
0 Figure K. (Violet 1 is an electrode, (+11#i workpiece.
<<8>> is the machining fluid, (41 is the DC power supply, (5Hj charging resistor, (61 is the charging/discharging capacitor, {7} is the negative side energizing wire, (81Fi positive side energizing wire.
a is a charging resistor (51K connected, negative - current carrying wire
71 and is connected to the electrode <<1>>. on the other hand. The positive side energizing wire 《81K is connected to the workpiece 《21 and one end of the charging/discharging capacitor 《61, and the charging/discharging capacitor {6
In addition to 1, 1m#i negative side current carrying wire (7) is connected to κ.

Next, the operation of this conventional device will be explained.

First, the current supplied from the DC power source (41) passes through the charging resistor to charge the charging/discharging capacitor (6). On the other hand, when the electrode (1) and the workpiece (21) reach a certain gap κ in the machining fluid (3), the insulation between the electrode (1) and the workpiece (2) is broken, and the charging/discharging capacitor (A discharge occurs between the charged electrode <<1>> where 61K is stored and the workpiece (self).

The conventional system is configured as described above, and as shown in FIG.
(There is a floating capacitor between 81 and a floating capacitor between electrode 11 and the workpiece mouth.) If you try to obtain the best machined surface roughness in this state, The discharge capacitor (self) can only be minimized or omitted.It has been difficult to reduce the surface roughness below a certain level due to the effects of the above-mentioned floating capacitor (9) and trout i.

This invention was made to eliminate the drawbacks of the conventional devices as described above. Eliminate the effects of all stray capacitors in the current-carrying lines. To obtain the minimum machined surface roughness o
The purpose of flJflJ is to provide an electric discharge machining device that can be easily operated.

An embodiment of the present invention will be described below with reference to FIG.

Figure 3 K. The same reference numerals as in the conventional device in Figs. 1 and 2 indicate the same or similar parts. In the figure. Q11 is a current smoothing coil. electrode"! ] and overcurrent 11ff+ are connected.

Next, the operation of this embodiment device will be explained in detail. First of all, Iris 3 diagram κ. The current supplied from the DC power supply (41) is charged through the charging resistor (51) and the charging/discharging capacitor (61 and the floating capacitor (9). At the same time as this charging, the current is passed through the current smoothing coil aD. In this state, electric charge is also accumulated on the floating capacitor shaft between the electrode (II) and the workpiece (21). Then, the 8 edges are destroyed and discharge occurs.Here, the current smoothing coil α11
is the charging/discharging capacitor (6) and the floating capacitor t (9)
Because there is an effect of gradually supplying the energy seen at 1K@ and the energy from the WIm power supply (4) to the electrode (11) and the workpiece (2rK).
The result is that it is hardly affected.

In addition, in the actual pongee example above, are the lights and smoothing coils used? } as the electrode (II
The connection K between the workpiece 《21〉 and the positive side energization II (81) can be inserted.Also, the charge/discharge condenser t (6》) is omitted. You may do so.

As described above, according to the invented device of The effects of this can be prevented. Even if the opposing area between the electrode and the workpiece changes, machining can always be performed with the minimum capacitor capacity, so obtaining the best machined surface roughness has an advantage.

[Brief explanation of drawings]

Figures 1 and 2 are diagrams showing the configuration of conventional electrical discharge machining equipment.
The Hgs diagram is a diagram showing the configuration of an electric discharge machining apparatus according to an example of Ichiji Koji according to the present invention. Note that the same symbols in the figures represent the same or similar parts. 《11 is the electrode, 1tj is the workpiece, αυ is the current smoothing coil, (71, (81 is the current carrying wire. .195

Claims (1)

[Claims] The machining gap κ formed between the machining electrode and the workpiece is energized. and that in the electric discharge machining device κ that processes the workpiece with the intervening machining fluid, the electrode in the current-carrying circuit or the current-smoothing coil between the workpiece and the current-carrying wire are inserted. Characteristic electrical discharge machining equipment.