지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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초록· 키워드
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The chemical composition of the wire electric discharge machining (WEDM) recasting layer must be analyzed, as it affects the surface properties of the product. This study examines the WEDM surfaces of cemented carbide (WC) and aluminum 7075 by (scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). Up to 87% of the diameter of the WC cylinder is machined by a brass wire. However, cracks and fluid forces break the remaining 13%. The broken cross-section consists of 1-㎛-sized WC grains bonded with cobalt metal and without brass elements. Copper elements, which do not exist in WC materials, are then detected on the convex spherical portion of the WC WEDM surface, and tungsten, which is the main component of the material, is observed on the lower surface. This indicates that some brass electrode particles that were removed by the spark adheres to the cemented carbide surface. The aluminum component is uniform, but the concentration of the copper component is scattered irregularly. Therefore, some melted electrodes appear to be irregularly attached to the aluminum 7075 WEDM surface. The oxygen component is distributed more in the convex than in the concave portion, which means that the convex portion of the aluminum is mainly oxidized to alumina. On the WEDM surface of the WC under a high melting point, 16.7 wt.% of zinc and 41.8 wt.% of copper, which were not detected prior to electric discharge machining, are detected. However, on the WEDM surface of aluminum 7075 with a low melting point, increases of only 8.8 wt.% of zinc and 6.3 wt.% of copper were observed.
목차
ABSTRACT
1. 서론
2. 와이어 방전가공
3. SEM EDS 분석
4. 결론
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