KR20040047036A - An electrode wire production method for a graphite coating discharge processing - Google Patents

Abstract

PURPOSE: An electrode wire production method for a graphitecoating discharge processing is provided to improve the current flow and keep the discharge efficiency uniform by coating the electrode with graphite. CONSTITUTION: An electrode wire production method for a graphitecoating discharge processing is composed of steps of: preparing a brass core(S1); performing the brass electric plating more than 2 microns(S2); washing, rinsing, and drying the core(S3); performing the graphitecoating more than 2 microns by dipping the core into a reservoir(S4); heat-treating the graphitecoating wire in an electric furnace filled with nitrogen gas at 400 to 500 degrees centigrade(S5); producing a variety of electrode wires with an automatic drawer(S6); and performing the graphitecoating more than 2 microns, heat-treating the wires at 250 to 300 degrees centigrade and then winding wires(S7).

Description

An electrode wire production method for a graphite coating discharge processing

The present invention relates to a method for producing an electrode wire for graphite coating discharge machining, in particular, to coat the graphite (earth graphite) on the brass electrode wire to double the flow of current, and to maintain a uniform discharge efficiency, so that the flux and the surface of the workpiece smoothly during discharge processing This improves the characteristics of the electrode line.

In general, wire electric discharge machining is a method of cutting a workpiece by using thermal energy generated by electric discharge between a wire electrode of a brass fine wire and a workpiece under water, and is mainly used for manufacturing a mold or a mechanical part for cutting into a complicated shape. .

Recently, if the metal is conductive as well as conductive, it is widely used due to its high precision in the processing of hard-processing materials such as diamond, cemented carbide, and ceramics.

Currently, the most widely used electrode wire for electric discharge machining is brass wire, which is 65% copper (Cu) -35% zinc (Zn) alloy, but especially when cutting speed is required, zinc (Zn) plated on the surface of steel wire or brass wire Plated wire is used.

It is known that the electrode of the electric discharge machine, the element that determines the cutting speed is the content of zinc (Zn) in the alloying material of the wire rod, the higher the zinc content is difficult to manufacture the wire rod, so that the surface of the core material Zinc is used by plating.

This is because heat generated during discharge is consumed with zinc (Zn) evaporating, and the higher the content of zinc (Zn) in the alloy, the greater the heat dissipation effect.

Conventional electrode wire manufacturing method is a process of automatic drawing by galvanizing after plating galvanized at 0.8 ~ 1.0 m / m, but the finished product dimensions from 0.8 m / m to 1.0 m / m because zinc and brass have a large difference in elongation Phosphorus 0.2m / m, 0.25m / m, 0.3m / m and the like have a reduction rate of 300 to 500%.

In addition, the electrode wire by the conventional process is inferior in adhesiveness, due to the difference in the elongation of zinc and brass cracks on the surface of the electrode wire and scratches occur in the fine wire it is difficult to produce a good electrode wire.

The present invention is to solve the conventional problems as described above, the object of the present invention is to coat the graphite (earth graphite) on the brass electrode wire to double the flow of current, so that the discharge efficiency is maintained uniformly during the discharge machining The present invention provides a method for producing an electrode wire for graphite coating discharge machining to smooth the surface of a workpiece to improve the characteristics of the electrode wire.

1 is an operation flowchart of a method for manufacturing an electrode line for graphite coating discharge machining according to the present invention.

The present invention comprises the first step of preparing a brass core material of 0.9% copper and 65% of zinc, 35% zinc, and 99.9% of the brass ingot (incoat) of less than 35% copper content of 65% zinc. And a second step of performing brass electroplating at least 2 microns, and a third step of washing, washing and drying the core material and depositing it in a deposition tank in which earthy graphite and an adhesive (inorganic) are mixed to apply at least 2 microns of graphite coating. And a fourth step of heat-treating the graphite-coated conductor at 400 ° to 600 ° C. in an electric furnace filled with nitrogen gas, and finished products such as 0.2 m / m, 0.25 m / m, and 0.30 m / m through an automatic drawing machine. The 5th process of producing electrode wire of the dimension, and the 6th process of heat-treating at 250 ° C ~ 300 ° C after winding 2 micron graphite coating by dipping in the deposition tank mixed with earth graphite and adhesive It is characterized by.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG.

According to the present invention, a brass core (in coat) having a copper content of 65% or more of zinc and less than 35% of zinc in an amount of 99.9% is prepared in a state of preparing a brass core containing 65% copper and 35% of zinc at 0.9 m / m. Electroplating is carried out at least 2 microns (S1, S2).

That is, when electroplating the 0.9m / m core material (brass wire), the normal (-) terminal is brought into contact with one side of the core material of 0.9m / m, and the (+) terminal, that is, the other side of the core material of 0.9m / m, By contacting the brass ingot of 65% zinc, less than 35% copper, 99.9% of the copper to be coated with a brass electroplating of 2 microns or more around the 0.9 m / m brass wire.

If the step (S2) is carried out, there is an advantage that can overcome the drawing limits of the brass wire and can increase the flux in the discharge machining.

In addition, the core material is washed, washed, dried, and deposited in a deposition tank in which earthy graphite and an adhesive (non-machine) are mixed so that graphite coating of 2 microns or more is performed (S3, S4).

And the graphite coated wire is heat-treated at 400 ° C ~ 600 ° C in a nitrogen gas filled electric furnace (S5).

In addition, 0.20m / m, 0.25m / m, 0.30m / with an automatic drawing machine in the state of the above 0.9m / m core material of brass electroplating of 2 microns or more and coated with graphite of 2 microns or more thereon Produce an electrode wire such as m (S6).

Then, it is deposited in a deposition tank in which earthy graphite and an adhesive are mixed, and then subjected to a graphite coating of 2 microns, followed by a heat treatment at 250 ° C. to 300 ° C., and winding up after inspection of the product (S7, S8).

The present invention, as described in detail above, doubles the flow of current by coating graphite (earth graphite) on the brass electrode wire, and maintains the discharge efficiency uniformly, thereby smoothing the line speed and the workpiece surface during discharge machining, thereby improving the characteristics of the electrode wire. It can be effected.

Claims (1)

65% copper at 0.9 m / m. The first process of preparing a brass core material of 35% zinc, A second step of forming a brass ingot (incoat) having a copper content of 65% or more and 35% or less of zinc to 99.9% and then conducting electroplating of the brass of 2 microns or more; A third step of washing, washing, and drying the core material and depositing it in a deposition tank in which earthy graphite and an adhesive are mixed to perform graphite coating of 2 microns or more; A fourth step of heat-treating the graphite-coated conductor at 400 ° C. to 600 ° C. in an electric furnace filled with nitrogen gas; A fifth process of producing electrode wires such as 0.20m / m, 0.25m / m, 0.30m / m through an automatic drawing machine, Method of producing an electrode wire for graphite coating discharge processing, characterized in that the sixth step of immersing in a sedimentation tank containing a mixture of soil graphite and an adhesive is subjected to a graphite coating of 2 microns, then heat treated at 250 ° C to 300 ° C and wound up after inspection of the product .