Study on manufacturing freeform surface parts in micro EDM based on skin effect theory  

作　　者：刘宇 Sundaram Murali Meenakshi Zhao Fuling Rajurkar Kamlakar P 

机构地区：[1]Key Laboratory for Precision ＆ Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, P.R. China [2]School of Dynamic Systems, University of Cincirmati, Cincinnati, OH, 45221, USA [3]Center for Nontraditional Manufacturing Research, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA

出　　处：《High Technology Letters》2011年第4期439-445,共7页高技术通讯（英文版）

基　　金：Supported by the National Natural Science Foundation of China （50635040） and the National Science Foundation of USA（CMMI-0728294 and CMMI- 0928873）

摘　　要：Micro fabrication of freeform surface parts made of hard and brittle materials is always a tough job in micro machining field. This paper tries to fabricate freeform surface feature by using smooth surface of tool electrode after tool wear in micro EDM. According to the skin effect theory, the tool end shape in the stage of uniform wear can be changed by adjusting the frequency of discharge pulse. The electrical energy distributing rule of tool electrode section in RC circuit has been investigated under the influence of skin effect, and the law of spark location change has been summarized. The experimental studies demonstrate that different shapes of tool ends can be achieved by varying the pulse frequencies of discharge power supply. Additionally, a micro part of freeform surface feature with high precision and good surface quality has been successfully obtained by micro EDM through adopting the smooth surface after tool wear.

关 键 词：micro EDM freeform surface skin effect tool shape 

分 类 号：TG661[金属学及工艺—金属切削加工及机床] TG659