Title: Stress field analysis of the single pulse discharge machining insulating alumina ceramics with high instantaneous energy density

Authors: Renjie Ji; Honge Liu; Yonghong Liu; Chenchen Xu; Ruiqiang Diao

Addresses: College of Electromechanical Engineering, China University of Petroleum, No. 66, Changjiang West Road, Huangdao District, Qingdao, 266580, China ' College of Electromechanical Engineering, China University of Petroleum, No. 66, Changjiang West Road, Huangdao District, Qingdao, 266580, China ' College of Electromechanical Engineering, China University of Petroleum, No. 66, Changjiang West Road, Huangdao District, Qingdao, 266580, China ' College of Electromechanical Engineering, China University of Petroleum, No. 66, Changjiang West Road, Huangdao District, Qingdao, 266580, China ' College of Electromechanical Engineering, China University of Petroleum, No. 66, Changjiang West Road, Huangdao District, Qingdao, 266580, China

Abstract: Insulating alumina ceramics have been widely used recent years due to their good properties. However, it shows low efficiency, high cost, and poor surface integrity when machining them with the traditional machining methods. A new method which employs the high instantaneous energy density for electric discharge machining of insulating alumina ceramics based on the assisting electrode is presented. The process uses the high voltage, large capacitor and high discharge energy, the high energy stored in the capacitor can be discharged to the tool electrode, assisting electrode, ceramic workpiece, and discharge gap in a very short time, so the process is able to effectively machine insulating alumina ceramics. Thermal-stress coupled analysis of the single pulse discharge is performed. The effects of dielectric, peak voltage, and capacitance on the stress field and the stress removed zone on the insulating alumina ceramics have been investigated.

Keywords: electrical discharge machining; EDM; instantaneous energy density; stress field; nanomanufacturing; insulating alumina ceramics; assisting electrodes; high voltage; large capacitors; high discharge energy; thermal-stress coupled analysis; single pulse discharge; dielectrics; peak voltage; capacitance; electro-discharge machining.

DOI: 10.1504/IJNM.2016.077058

International Journal of Nanomanufacturing, 2016 Vol.12 No.2, pp.119 - 142

Received: 05 Nov 2015
Accepted: 27 Nov 2015
Published online: 20 Jun 2016 *

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