JPH0349826A - Electrifying device for electrolytic finishing machine - Google Patents

Abstract

PURPOSE:To constrain the movement of a flexible conductor at a pulse feeding time and to reduce an impact sound by dipping into an electrolytic liquid the flexible conductors respectively connected to one part of an electrifying panel, electrode and a work. CONSTITUTION:An electrolytic liquid is fed inside a work tank P to the position where an electrode 2 and a work 4 are completely dipped in this electrolytic liquid. A specific single pulse current is then fed from a power source device 7 after this electrolytic liquid being fed in a specific amount and the electrolytic liquid in the gap being rested and the work face of the work 4 is eluted by the electrolytic action. At this time, braided wire (flixible conductor) 15, 16 located between an electrifying panel 13 and the work 4 and an electrifying panel 14 and electrode fixing device 3 try to move by a large current pulse to be fed, e.g., an electro-magnetic force by the large current pulse in 20,000A, but the braided wires are dipped in the electrolytic liquid and the movement is restrained by the viscous resistance of this electrolytic liquid.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an energizing device for an electrolytic finishing machine that finishes a workpiece by electrolytic action.

[Conventional technology] Conventionally, a workpiece and an electrode having an electrode surface patterned after the machined surface of the workpiece are placed opposite each other at a predetermined gap in an electrolytic solution, and a pulse is supplied between the electrodes to finish the workpiece. A finishing machine is disclosed, for example, in Japanese Patent Laid-Open No. 196321/1983. The energizing device of this electrolytic finishing processing machine connects the energizing panel installed on the upper side plate of the processing tank and the power supply device with a bus bar, and connects the energizing panel, electrodes, and workpieces in a way that can accommodate various shapes of workpieces, etc. , are connected by flexible braided Mi wires.

[Problems to be Solved by the Invention] By the way, in this energizing device, for example, 20,000
Since a single large current pulse exceeding A is supplied between the electrode and the workpiece through the braided wire to electrolytically finish the workpiece, the following problems occur when the pulse is supplied.

That is, due to the electromagnetic force caused by the large current pulse when the pulse is supplied, the braided wire moves greatly (vibrates or oscillates), and this movement generates a large impact sound and also causes one end of the &W braided wire to be located in the air. Since the ends are located in the electrolyte, the movement of the braided wire causes the electrolyte in the processing tank to scatter. In addition, due to the large movement of the braided wire connected to the electrode part,
When pulses are supplied, the electrode moves and the machining gap with the workpiece changes, which adversely affects finishing machining accuracy.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems, to realize an energizing device for an electrolytic finishing machine that suppresses the generation of impact noise due to the movement of the braided wire, etc., and provides a highly accurate finished surface.

[i! ! Means for Solving the Problem] In order to solve this object, the present invention provides a workpiece and an electrode having an electrode surface patterned after the machined surface of the workpiece at a predetermined gap in an electrolytic solution in a processing bath. A device for electrolytically finishing a workpiece by supplying pulses from a DC power supply between the electrodes, which are connected to the anode and cathode of the DC power supply, respectively, and at least a part of which is immersed in the electrolytic solution. , a pair of energizing panels disposed on the inner surface of the side plates of the processing tank, and a flexible flexible plate connected to a part of the energizing panels, the electrode and the work, respectively, and immersed in the electrolytic solution. A conductor.

[Function] According to the configuration of this invention, the flexible conductor is immersed in the electrolyte, so the movement of the flexible conductor when a large current pulse is supplied is suppressed by the electrolyte, reducing impact noise. At the same time, it prevents the electrolyte from scattering. It also prevents changes in the machining gap due to movement of the electrode during pulse supply.

[Example] Hereinafter, an example of the present invention will be described in detail and specifically based on the drawings.

1 to 3 show an embodiment of the present invention. In FIG. 1.2, an electrolytic finishing machine 1 includes an electrode fixing device 3 for fixing an electrode 2, a surface plate 5 for fixing a work 4, and an electrode 2. an electrode drive unit 6 that moves up and down to maintain a predetermined gap with the workpiece 4;
, a power supply device 7 that supplies a predetermined pulse current between the electrode 2 and the workpiece 4, an input device 8 that inputs data and processing conditions regarding the workpiece 4, a processing tank 9, and an electrolyte filtration device 10.
Consists of etc.

The power supply device 7 is composed of a DC power supply having a plurality of capacitors (not shown) connected in parallel, and the anode (+) terminal and cathode (-) terminal of the power supply device 7 are connected to the workpiece 4 and the electrode 2. Connect as follows.

That is, as shown in FIG. 3, the + terminal and the - terminal are
A conductive energizing board 13. which is arranged on the inner surface of the right side plate 9a and the inner surface of the rear side plate 9b of the processing tank 9 is connected by bus bars 11 and 12.
For example, two g-branch wires 15.16 and 17.18 are fixed to the upper part of the energizing panels 13 and 14, respectively.
One end fixing portions 15a to 18a are fixed, respectively. The other end fixing part 15b116b of the 1st wire 15.16 is fixed to the workpiece 4 with a screw or with a fixture used when fixing the workpiece 4 to the surface plate 5.
Press and fix. Further, the other end fixing parts 17b and 18b (17b is not shown) of the braided wires 17 and 18 are fixed to the back side of the electrode fixing device 3 with screws or the like. Thereby, the child terminal of the power supply device 7 is electrically connected to the workpiece 4, and one terminal is electrically connected to the electrode 2.

In addition, a part of the energizing board 13, 14, that is, a part to which the one end fixing parts 15a to 18a of the braided wires 15 to 18 are fixed, is immersed in the electrolytic solution as shown in FIG. 1.2. Form to size.

Next, the operation of this invention will be explained.

First, a workpiece 4 machined into a desired shape by die-sinking electrical discharge machining or wire-cut electrical discharge machining, and this workpiece 4
with the electrode 2 or the remaining material used when electrical discharge machining the
These are fixed to the surface plate 4 and the electrode fixing device 3, respectively, and set to maintain a predetermined machining gap by the electrode driving device 6. And each fixing part 15a of the braided wires 15 to 18.
18a, 15b to 18b are fixed to the energizing board 13 and the workpiece 4, and to the energizing board 14 and the electrode fixing device 3, respectively, and the electrolytic solution is placed in the processing tank 9 at a position where the electrode 2 and the workpiece 4 are completely immersed in the electrolytic solution. supply up to.

When a predetermined amount of electrolytic solution is supplied and the electrolytic solution in the gap becomes stationary, a predetermined single pulse current is supplied from the power supply device 7, and the machined surface of the workpiece 4 is eluted by electrolytic action. At this time, the braided wires 15 to 18 try to move due to the electromagnetic force caused by the supplied large current pulse, for example, 20.0OOA (10.0OOA per braided wire). 18 is immersed in an electrolytic solution, and its movement is suppressed by the viscous resistance of this electrolytic solution.

When the pulse current is turned off, the electrode 2 is raised and a nozzle (not shown) is placed so as to be directed toward the machining gap.
The process of squirting clean electrolyte to remove machining debris from the gap, then lowering the electrode 2 to reset it to its initial position, and supplying the next pulsed current is repeated a predetermined number of times. Esu.

In this way, in the above embodiment, the energization panels 13 and 14
is sized to extend from the upper part to the lower part of the right side plate 9a and rear side plate 9b of the processing tank 9, and the braided wires 15 to 18 are fixed to the lower part thereof, and the braided wires 15 to 18 are immersed in the electrolytic solution during processing. With this configuration, the movement of the braided wires 15 to 18 when a large current pulse is supplied can be suppressed, and the g braided wire 15
Since the impact noise caused by the movement of the wires 15 to 18 can be reduced, and the braided wires 15 to 18 are completely immersed in the electrolyte,
It is possible to prevent the electrolyte from scattering at the interface between the electrolyte and air in the processing tank 9 due to the movement of the braided wires 15 to 18.

Furthermore, since the movement of the braided wires 17 and 18 fixed to the electrode fixing device 3 is suppressed, the braided wires 17 and 18 are restrained from moving when pulses are supplied.
It is possible to prevent the machining gap between the electrode 2 and the workpiece 4 from changing due to the movement of the electrode 18, to maintain the machining gap constant at all times, and to obtain highly accurate surface quality. Furthermore, since the movement of the braided wires 15 to 18 is reduced, the fixed portion 1 of the braided wires 15 to 18
The reliability of the braided wires 15 to 18 itself can be improved without degrading the durability of the braided wires 5a to 18a and 15b to 18b.

In the above embodiment, the size of the energization panel extends from the top to the bottom of the side plate of the processing tank, but the present invention is not limited to this in any way. An appropriate configuration of the energization board and bus bar that allows the flexible conductor to be immersed in the electrolytic solution may be adopted, such as providing a busbar from the power supply device only to the energization board and extending the busbar from the power supply device to the energization board.

In addition, the side plates on which the energizing board is installed are not limited to the right side plate and the rear side plate, but may be provided on the left and right side plates, respectively, or on the same side plate.Furthermore, the energizing board can be connected to the electrodes and the workpiece. The flexible conductor is not limited to a braided wire, and a flexible cable or the like may be used. Furthermore, the connection structure between the flexible conductor, the electrode, and the workpiece may be changed as appropriate, such as by directly fixing the flexible conductor on the electrode side to the electrode.

[Effects of the Invention] Since the present invention is configured as described above, it produces the following effects.

■ Movement of the flexible conductor during pulse supply can be suppressed, reducing impact noise.

■ There is no movement of the flexible conductor at the interface between the electrolyte and air, which prevents the electrolyte from scattering in the processing tank.

■ The movement of the electrode due to the movement of the flexible conductor can be suppressed, the machining gap can be maintained constant, and a highly accurate finished surface can be obtained.

■ The reliability of the braided wire itself can be improved.

[Brief explanation of drawings]

FIG. 1 is a front view of an electrolytic finishing machine embodying the present invention, FIG. 2 is a side view of the same, and FIG. 3 is a partially cutaway perspective view of the same essential parts. 1... Electrolytic finishing machine, 2... Electrode, 4... Workpiece, 7... Power supply, 9φ... Processing tank, IL 12・φ・Bus bar 13.14...
・Electricity board, 15-18...braided wire.

Claims (1)

[Claims] (1) A. A workpiece and an electrode having an electrode surface that follows the machined surface of the workpiece are placed opposite each other with a predetermined gap in an electrolytic solution in a processing tank, and pulses are supplied from a DC power source between the electrodes. (b) connected to the anode and cathode of the DC power source, respectively;
a pair of energizing panels disposed on the inner surface of the side plates of the processing tank such that at least a portion thereof is immersed in the electrolytic solution; c. a portion of the energizing panel is connected to the electrode and the workpiece, respectively; , a flexible conductor disposed so as to be immersed in the electrolytic solution, and an energization device for an electrolytic finishing machine.