Performance Evaluation of Electrical Discharge Machining using Ultrafine-Grained Cu Electrodes Processed by Equal Channel Angular Pressing and Deep Cryogenic Treatment

Autor: Wei Wei, Igor V. Alexandrov, Li Chen Yang, Kun Xia Wei, Zhu Qi Chu, Qing Bo Du, Jing Hu
Rok vydání: 2020
Předmět:
Zdroj: Journal of Materials Engineering and Performance. 30:281-289
ISSN: 1544-1024
1059-9495
DOI: 10.1007/s11665-020-05351-2
Popis: The role of the electrode in electric discharge machining (EDM) performance is crucial because it has an impact on the geometrical accuracy, machining efficiency and surface finish of the machined components. In the present work, a new technical approach combining equal channel angular pressing (ECAP) and deep cryogenic treatment (DCT) was put forward to manufacture copper electrodes for enhancing the machining characteristics of electric discharge machining (EDM). Effects of the ECAP, the ECAP + DCT on the EDM performances including the electrode wear rate (EWR), the workpiece corner sharpness (WCS), the surface roughness (Ra) and the surface characteristics of EDM workpieces have been investigated. The EWR after the ECAP and the ECAP + DCT was reduced to the minimum after two passes of ECAP. The EWR and WCS after the ECAP + DCT were less than that after the ECAP due to the higher hardness and electrical conductivity. The Ra of EDM workpieces using electrodes processed by the ECAP + DCT was slightly less than that after ECAP. An analogous Hall–Petch relation between the Ra of EDM workpieces and the grain size of electrodes was observed, indicating that ultrafine-grained electrodes processed by ECAP and the additional DCT would enhance the surface finish. The surface finish of EDM workpieces was discussed based on the features of the surface morphology.
Databáze: OpenAIRE
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