MACHINABILITY OF PURE METALS BY ELECTRICAL DISCHARGE MACHINING

Revista Produção e Desenvolvimento. 2018;4(1):54-67 DOI 10.32358/rpd.2018.v4.311

 

Journal Homepage

Journal Title: Revista Produção e Desenvolvimento

ISSN: 2446-9580 (Online)

Publisher: Centro Federal de Educação Tecnológica Celso Suckow da Fonseca

Society/Institution: Centro Federal de Educação Tecnológica Celso Suckow da Fonseca

LCC Subject Category: Social Sciences: Industries. Land use. Labor | Social Sciences: Social sciences (General)

Country of publisher: Brazil

Language of fulltext: Portuguese

Full-text formats available: PDF

 

AUTHORS

Pedro Miguel Horta Sousa (IDMEC, Departamento de Engenharia Mecânica, Instituto Superior Técnico, Universidade de Lisboa, Portugal)
Ivo Manuel Ferreira de Bragança (Departamento de Engenharia Mecânica, Instituto Superior de Engenharia de Lisboa, Portugal)
Abílio Manuel Pinho de Jesus (Departamento de Engenharia Mecânica, Faculdade de Engenharia da Universidade do Porto, Portugal)
José Duarte Ribeiro Marafona (Departamento de Engenharia Mecânica, Faculdade de Engenharia da Universidade do Porto, Portugal)
Pedro Alexandre Rodrigues Carvalho Rosa (IDMEC, Departamento de Engenharia Mecânica, Instituto Superior Técnico, Universidade de Lisboa, Portugal)

EDITORIAL INFORMATION

Double blind peer review

Editorial Board

Instructions for authors

Time From Submission to Publication: 4 weeks

 

Abstract | Full Text

Electrical discharge machining (EDM) involves the generation of micro-plasmas subjected to high temperature and pressure to promote the material removal. Hence, to understand the material removal mechanism it is of great importance the knowledge of the interaction plasma-solid. Knowing how physical and chemical properties of materials affect heat transfer at the electrode surface, how this eventually affects electrical properties of the plasma channel over the discharge time are key issues to achieve a better understanding of this machining technology. This research attempts to provide some answers to these issues by means of single plasma discharge tests under laboratory-controlled conditions carried out on pure and low-alloyed materials in favour of comprehensiveness and forthcoming numerical modelling. These results demonstrate that material eroded volume is correlated with process operating parameters and that crater morphology has presented a more regular shape in pure metals than in engineering materials. The machinability index of the materials under study has been determined by calculations of the eroded volume and electrical power measures. Further to the low predictability of the models presented in literature, it was also proposed a basic conceptual model referring to the morphology of the eroded craters.