• Journal of the Korea Academia-Industrial cooperation Society
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• v.3 no.2
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• pp.69-73
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• 2002

The effect of the numbers of processing on the punch and surface roughness of die block in the W-EDM, which is frequently used to manufacture parts of press die is studied. W-EDM equipment (Sodic A500H), the application of which has increased for its precision, is used in the process three times. To inspect the roughness of the three-time-processed dimension of the punch and the die, the surface roughness measuring instrument (System 5000 of Federal) is used.

• Proceedings of the KAIS Fall Conference
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• 2002.05a
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• pp.59-64
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• 2002

The effect of the numbers of processing on the punch and surface roughness of die block in the W-EDM, which is frequently used to manufacture parts of press die is studied. W-EDM equipment(Sodic A500H), the application of which has increased for its precision, is used in the process three times. To inspect the roughness of the three-time-processed dimension of the punch and the die, the surface roughness measuring instrument(System 5000 of Federal) is used.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.05a
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• pp.253-253
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• 2004

방전가공은 현재의 정밀 금형산업에서는 필수적인 가공방법이나, 공작물과 전극사이에서 방전이 발생할 때 고온고압의 플라즈마 상태에서 재료를 제거하는 메카니즘에 대한 해석은 아직도 많은 연구 대상이다. 방전가공은 기본적으로 3단계의 과정으로 구별할 수 있는데, 첫째 공작물과 전극의 간격과 기하학적 형상, 전압에 의해서 전계가 집중되어 절연체의 절연강도보다 초과하면 절연체가 이온화되어 방전이 시작된다. 둘째, 전극과 공작물이 통전이 되어 플라즈마 채널이 형성되면서 열에너지에 의하여 공작물이 용융 증발이 발생한다.(중략)

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1992.10a
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• pp.96-100
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• 1992

각종 금형 중 사출금형과 프레스 금형이 전체의 80~90%를 차지하고 있으며, 이들 금형을 가공할 때 방전가공이 주로 이용되되 있다. 금형재료 중에서 합금공구강(STD 11)은 열처리하였을 때 경도가 매우 커서 프레스 금형의 다이오와 펀치 등에 널리 사용되고 있다. 이것은 Wire-EDM 이나 Die Sinking EMD으로 가공하고 있다. 따라서 본 연구에서 프레스 금형의 다이와 펀치 등에 널리 사용되는 열처리된 STD11을 사용하여 가공 제특성에 영향을 주는 가공조건, 즉 방전전류펄스폭 및 방전전류파 고치를 변화시켜 이에 따른 공작물 가공량, 전극소모비, 표면조도, 가공단면의 열변질층 및 경도 변화 등 방전가공비의 성상을 조사하여 STD11의 최적의 방전가공조건을 찾고자 하는 것을 목적으로 하였다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.9 no.1
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• pp.134-139
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• 2005

This paper works on the manufacture and performance evaluation of bi-polar power supplied diesinking electrical discharge machine. The design and implementation of diesinking electrical discharge machine consists of two parts which are a polarity voltage controller design and a servo motor controller design and they are verified and manufactured through simulation. The performance of the implemented machine and conventional one were evaluated by comparing its machining speed and roughness of machined surface. Eventually, the designed machine showed improved performance in the speed and the roughness.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.10a
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• pp.83-83
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• 2003

• Journal of Digital Convergence
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• v.16 no.12
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• pp.309-315
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• 2018

In this paper, propose an efficient arc detection and control method to achieve fast machining speed, improved precision and surface roughness in discharge machining, especially for carbide and hard material processing and metal processing using discharge phenomenon as energy. A single discharge waveform is divided into three sections of Td (Time-Delay), Ton (Time-on) and Toff (Time-off) and the gate control timing is simulated using the HDL language. In this paper, we analyze the effect of the gap between the electrode and the workpiece on the machining results by determining the operation of the servo mechanism by sampling the Td section through the comparator circuit. As a result of the analysis, the Td section of the formed waveform was more precisely sampled at a high speed and the results were improved when applied to the gap control between the electrode and the workpiece.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2010.11a
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• pp.311-312
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• 2010

• Journal of the KSME
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• v.46 no.1 s.302
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• pp.40-45
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• 2006

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2006.05a
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• pp.569-570
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• 2006

In this study, the characteristics of Electrical Discharge Machining (EDM) with the electrode materials were investigated. EDM experiments have been carried out on electrodes with eight different copper-based and graphite-based materials. From the results, the copper-based electrodes showed excellent surface roughness than the graphite-based electrodes. But graphite based electrodes have advantages in economic aspects.