Machining phenomena in WEDM of insulating ceramics

Recently, an electrical discharge machining (EDM) method of insulating ceramics was proposed by the authors. This paper describes the arbitrary shape machining method of Si 3N 4 insulating ceramics by WEDM. In the WEDM of thick workpieces of Si 3N 4 insulating ceramics, wire breakages occurred frequ...

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Bibliographic Details
Published in:Journal of materials processing technology 2004-06, Vol.149 (1), p.124-128
Main Authors: Tani, Takayuki, Fukuzawa, Yasushi, Mohri, Naotake, Saito, Nagao, Okada, Masaaki
Format: Article
Language:English
Subjects:
Assisting electrode method
Insulating ceramics
WEDM
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Summary:Recently, an electrical discharge machining (EDM) method of insulating ceramics was proposed by the authors. This paper describes the arbitrary shape machining method of Si 3N 4 insulating ceramics by WEDM. In the WEDM of thick workpieces of Si 3N 4 insulating ceramics, wire breakages occurred frequently. To avoid the breakage conditions, a new assisting electrode material was used. Using this method, a thin ceramics sheet was hollowed out of Si 3N 4 ceramics without breakages. In the machining of thin sheets, a warping phenomenon is observed to occur towards the end of the product owing to thermal residual stress. The amount of warp is dependent on, and can be reduced considering, the machining path. Furthermore, an axisymmetric products can be machined by this method with a rotating workpiece system.
ISSN:0924-0136
DOI:10.1016/j.jmatprotec.2003.12.027