Effects of milling condition on the surface integrity of hot forged steel

• Autor(a) principal: Rodrigues, Alessandro R. [UNESP]
• Data de Publicação: 2010
• Outros Autores: Matsumoto, Hidekasu, Yamakami, Wyser J., Paulo, Rafael Gustavo Da R., De Assis, Cleiton Lazaro F.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1590/S1678-58782010000100006; http://hdl.handle.net/11449/219579
• topic: Hardness; High-speed cutting; Milling; Roughness; Surface integrity

This paper presents a study on the influence of milling condition on workpiece surface integrity focusing on hardness and roughness. The experimental work was carried out on a CNC machining center considering roughing and finishing operations. A 25 mm diameter endmill with two cemented carbide inserts coated with TiN layer were used for end milling operation. Low carbon alloyed steel Cr-Mo forged at 1200°C was used as workpiece on the tests. Two kinds of workpiece conditions were considered, i.e. air cooled after hot forging and normalized at 950°C for 2 h. The results showed that finishing operation was able to significantly decrease the roughness by at least 46% without changing the hardness. On the other hand, roughing operation caused an increase in hardness statistically significant by about 6%. The machined surface presented deformed regions within feed marks, which directly affected the roughness. Surface finish behavior seems to correlate to the chip ratio given the decrease of 25% for roughing condition, which damaged the chip formation. The material removal rate for finishing operation 41% greater than roughing condition demonstrated to be favorable to the heat dissipation and minimized the effect on material hardness. Copyright © 2010 by ABCM.