KR100481950B1 - An electrode wire production method for a graphite coating discharge processing - Google Patents
An electrode wire production method for a graphite coating discharge processing Download PDFInfo
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- KR100481950B1 KR100481950B1 KR10-2002-0075091A KR20020075091A KR100481950B1 KR 100481950 B1 KR100481950 B1 KR 100481950B1 KR 20020075091 A KR20020075091 A KR 20020075091A KR 100481950 B1 KR100481950 B1 KR 100481950B1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
- B23H7/08—Wire electrodes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
- B23H1/04—Electrodes specially adapted therefor or their manufacture
- B23H1/06—Electrode material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/22—Electrodes specially adapted therefor or their manufacture
- B23H7/24—Electrode material
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- Electrochemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
본 발명은 황동 전극선에 흑연(토상흑연)을 코팅하여 전류의 흐름을 배가하고, 방전 효율을 균일하게 유지하므로 방전 가공시 선속과 가공물 표면을 평활하게 하여 그 특성이 뛰어남은 물론 상품성이 우수하도록 한 흑연 코팅 방전 가공용 전극선 제조방법에 관한 것이다.The present invention doubles the flow of current by coating graphite (earth graphite) on the brass electrode wire and maintains the discharge efficiency uniformly, so that the line speed and the surface of the workpiece are smoothed during discharge processing, so that the characteristics are excellent as well as the merchandise is excellent. The present invention relates to a method for producing an electrode wire for graphite coating discharge machining.
본 발명은 0.9m/m의 동 65%, 아연 35%의 황동심재를 준비하는 제1공정과, 상기 심재에 아연 65%이상 동함량 35%이내의 황동괴(인로트)를 99.9%로 조성한 후 황동 전기도금을 2미크론 이상 실시하는 제2공정과, 상기 심재를 세정, 세척, 건조하고. 토상 흑연 및 접착제(무기계)를 혼입한 침적조에 침적하여 2미크론 이상의 흑연 코팅을 실시하는 제3공정과, 상기 흑연 코팅된 도선을 질소가스가 충진된 전기로에서 400-600° C로 열처리하는 제4공정과, 자동 인발기를 통해 0.20m/m. 0.25m/m, 0.30m/m 등의 완제품 치수의 전극선을 생산하는 제5공정과, 토상 흑연 및 접착제를 혼입한 침적조에 침적하여 2미크론의 흑연 코팅후 250°C ∼ 300° C에서 열처리하고 제품 검사후 권취하는 제6공정으로 이루어진다.The present invention is the first step of preparing a brass core material of 65% copper, 35% zinc of 0.9m / m, and a brass ingot (in lot) of less than 35% copper content of 65% zinc in the core material 99.9% After the second step of conducting brass electroplating 2 microns or more, and the core material is washed, washed, dried. A third step of applying a graphite coating of 2 microns or more by depositing it in a deposition tank in which soil graphite and an adhesive (inorganic) are mixed; and a fourth process of heat treating the graphite coated conductor at 400-600 ° C. in an electric furnace filled with nitrogen gas. Process and 0.20m / m through automatic drawing machine. The fifth process of producing electrode wires with finished product dimensions such as 0.25 m / m and 0.30 m / m, and the immersion tank incorporating soil graphite and adhesive were deposited and heat treated at 250 ° C to 300 ° C after 2 micron graphite coating. It consists of the 6th process of winding up after product inspection.
Description
본 발명은 흑연 코팅 방전 가공용 전극선 제조방법에 관한 것으로, 특히 황동 전극선에 흑연(토상흑연)을 코팅하여 전류의 흐름을 배가하고, 방전 효율을 균일하게 유지하므로 방전 가공시 선속과 가공물 표면을 평활하게 하여 주어 전극선의 특성을 향상시킨 것이다.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.
일반적으로 와이어 방전가공은 수중에서 황동세선의 와이어 전극과 피삭물 간의 방전으로 발생하는 열에너지를 이용하여 공작물을 절단 가공하는 방법으로, 주로 복잡한 형상으로 절단 가공하려는 금형이나 기계부품 등의 제조에 사용되고 있다.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. .
최근에는 금속은 물론 도전성이 있는 것이라면 다이아몬드, 초경합금, 세라믹스와 같이 난가공성 재료의 가공에도 정밀성이 높아서 확대 보급되고 있는 실정이다.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.
현재 방전가공기 전극선으로 가장 많이 사용되고 있는 재료는 65%동(Cu)-35%아연(Zn)합금인 황동선이지만 특히 절삭속도를 요하는 경우에는 강철선이나 황동선의 표면에 아연(Zn)을 도금한 아연 도금선이 사용되고 있다.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.
지금까지 알려진 바에 의하면, 방전가공기 전극선 재료로서, 절삭속도를 좌우하는 요소는 선재의 합금성분 중에 아연(Zn)의 함량으로, 아연의 함량이 높을수록 선재의 제조에 어려움이 커서 일반 심재의 표면에 아연을 도금하여 사용하고 있다.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.
이는 방전시 발생되는 열이 증발하는 아연(Zn)과 함께 소모되기 때문이며, 합금중에 아연(Zn)의 함량이 높을수록 그 만큼 방열 효과도 큰 것으로 확인되고 있다.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.
종래의 전극선 제조방법은 0.8∼1.0 m/m에서 아연도금을 한 후 확산 처리하여 자동 인발하는 공정이나, 아연과 황동은 그 신장율의 차이가 크므로 0.8m/m~1.0m/m에서 완제품 치수인 0.2m/m, 0.25m/m, 0.3m/m등은 단면적의 감소율이 300∼500%이다.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%.
또한, 상기 종래의 공정에 의한 전극선은 접착성이 떨어지며, 아연과 황동의 신장율의 차이로 인하여 전극선의 표면에 크랙이 가고 세선중에 스크래치가 발생하여 양질의 전극선을 생산하기가 어려운 결점이 있다.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.
본 발명은 상기와 같은 종래의 문제점들을 해결하기 위한 것으로, 본 발명의 목적은, 황동 전극선에 흑연(토상흑연)을 코팅하여 전류의 흐름을 배가하고, 방전효율을 균일하게 유지하므로 방전 가공시 선속과 가공물 표면을 평활하게 하여 전극선의 특성을 향상시키도록 한 흑연 코팅 방전 가공용 전극선 제조방법을 제공하는데 있다.The present invention is to solve the conventional problems as described above, an object of the present invention is to coat the graphite (earth graphite) on the brass electrode line to double the flow of current, and to maintain the discharge efficiency 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.
본 발명은 0.9m/m의 동 65%, 아연 35%의 황동심재를 준비하는 제1공정과, 상기 심재에 아연 65%이상 동함량 35%이내의 황동괴(인코트)를 99.9%로 조성한 후 황동 전기도금을 2미크론 이상 실시하는 제2공정과, 상기 심재를 세정, 세척, 건조하고, 토상 흑연 및 접착제(무기계)를 혼입한 침적조에 침적하여 2미크론 이상의 흑연 코팅을 실시하는 제3공정과, 상기 흑연 코팅된 도선을 질소가스가 충진된 전기로에서 400° ∼ 600° C로 열처리하는 제4공정과, 자동 인발기를 통해 0.2m/m, 0.25m/m, 0.30m/m 등의 완제품 치수의 전극선을 생산하는 제5공정과, 토상 흑연 및 접착제를 혼입한 침적조에 침적하여 2미크론의 흑연 코팅을 실시한 후 250° C∼300° C에서 열처리하고 제품검사후 권취하는 제6공정으로 이루어짐을 특징으로 한다.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.
이하, 본 발명의 실시 예를 동작흐름도인 도 1을 참고로 하여 상세히 설명하면 다음과 같다.Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG.
본 발명은 0.9m/m의 동 65%, 아연 35%이 함유된 황동심재를 준비한 상태에서 상기 심재에 아연 65%이상 동함량 35%이내의 황동괴(인코트)를 99.9%로 조성한 후 황동 전기도금을 2미크론 이상 실시한다(S1, S2).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).
즉, 상기 0.9m/m의 심재(황동선)을 전기도금할 경우, 이 0.9m/m의 심재 일측에는 통상의 (-)단자를 접촉시키고, 0.9m/m의 심재 타측에는 (+)단자 즉, 아연 65%, 동 35% 이하의 99.9%의 황동괴를 접촉시킴으로써 상기 0.9m/m의 황동선 둘레에 2미크론 이상의 황동전기도금이 코팅되도록 한다.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.
상기 공정(S2)을 실시하면, 황동선의 인발한계를 극복할 수 있는 장점이 있으며 방전 가공시 선속을 증대할 수 있다.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.
또한, 상기 심재를 세정, 세척, 건조하고, 토상 흑연 및 접착제(무기계)를 혼입한 침적조에 침적하여 2미크론 이상의 흑연 코팅이 이루어지도록 한다(S3, S4).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).
그리고 상기 흑연 코팅된 도선을 질소가스가 충진된 전기로에서 400° C∼600° C로 열처리한다(S5).And the graphite coated wire is heat-treated at 400 ° C ~ 600 ° C in a nitrogen gas filled electric furnace (S5).
또한, 상기와 같이 0.9m/m의 심재에 2미크론 이상의 황동전기도금이 이루어지고 또 그 위에 2미크론 이상의 흑연이 코팅된 상태에서 자동 인발기를 통해 0.20m/m, 0.25m/m, 0.30m/m 등의 전극선을 생산한다(S6).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).
그리고 토상 흑연 및 접착제를 혼입한 침적조에 침적하여 다시 2미크론의 흑연 코팅을 실시한 후 250° C∼300° C에서 열처리하고 제품 검사후 권취한다(S7, S8).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).
이상에서 상세히 설명한 바와 같은 본 발명은 황동 전극선에 흑연(토상흑연)을 코팅하여 전류의 흐름을 배가하고, 방전 효율을 균일하게 유지하므로 방전 가공시 선속과 가공물 표면을 평활하게 하여 전극선의 특성을 향상시킬 수 있는 효과가 있다.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.
도 1은 본 발명에 따른 흑연 코팅 방전 가공용 전극선 제조방법의 동작 흐름도1 is an operation flowchart of a method for manufacturing an electrode line for graphite coating discharge machining according to the present invention.
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