Influence of different dielectrics fluids on the surface integrity of high speed steel

• Published in: Acta scientiarum. Technology Vol. 40; no. 1; pp. 35386 - e35386
• Main Authors: Rodrigues, Jean Robert Pereira, Forte, Paulo Ricardo Almeida, Cunha, Adilto Pereira Andrade, Gonçalves, Rubens Soeiro, Melo, Mirian de Lurdes Noronha Motta, Nascimento, Carmem Célia Francisco do
• Format: Journal Article
• Language: English
• Published: Maringa Editora da Universidade Estadual de Maringá - EDUEM 01-01-2018; Universidade Estadual de Maringá
• Subjects: Abrasion resistant steels; Aircraft components; Conductors; Die stamping; dielectric fluid; Dielectrics; Dies; Electric conductors; Grooves; Heat affected zone; High speed tool steels; Machining; machining by electrical discharges; Microcracks; microcracks and heat affected zone; Molds; Surgical instruments; Thermal energy; Tooling
• ISSN: 1806-2563; 1807-8664; 1807-8664; 1806-2563
• DOI: 10.4025/actascitechnol.v40i1.35386

Machining by electrical discharges is a huge process for the machining of complex shapes in materials that are electrical conductors, in particular for those of high hardness, difficult to be machined by conventional processes. Its unique feature of using thermal energy to machine parts has been a distinctive advantage in the manufacture of moulds, dies, aerospace components, and surgical, and of course, it can be widely used in the industry of tooling in the manufacture of geometric features, such as, for example, cavities narrow and deep, grooves, thin-walled, and small corner radii. One of the materials that are widely machined by spark-erosion is the tool steel (ABNT M2, has good toughness, hardness and abrasion resistance being indicated for the manufacture of stamping dies. The present work describes experiments conducted on a modern machine eletroerosiva using the electrode-tool of electrolytic copper in the machining of parts from high-speed steel (ABNT M2 to investigate the effect of different fluid dielectric about the generation of microcracks and heat affected zone (HAZ). A review of the comparative shows that the surfaces machined with dielectric fluid “A” have low values in the length of the microcracks compared with the other fluids. In the meantime, the machined surfaces with the dielectric “B” have a lower density of microcracks.