Hot Machining of Hardened Steels with Coated Carbide Inserts | Science Publications

American Journal of Engineering and Applied Sciences

A. N.M. Karim¹  T. L. Ginta¹  M. A. Lajis¹  H. C.D.M. Radzi¹  A. K.M.N. Amin¹ 

关键词: Hot machining;    hardened steels;    tool wear and surface roughness;   

DOI  :  10.3844/ajeassp.2009.421.427

学科分类：工程和技术（综合）

来源: Science Publications

【 摘 要 】

Problem statement: The benefits of easier manufacture of hardened steel components can be substantial in terms of reduced machining costs and lead times compared to the traditional route involving machining of the annealed state followed by heat treatment, grinding/EDM and manual finishing. But machinability of hard material through conventional machining is hindered due to excessive wear of the cutting tools and differently in achieving desired quality of the machined surface. In end milling the cutting tool is not in constant operation and so undergoes a heat cycle during the intermittent cutting. This alternate heating and cooling of the inserts lead to the thermal cracks and subsequently failure of the tool. Approach: This study was conducted to investigate the effect of preheating through inductive heating mechanism in end milling (vertical milling center) of AISI D2 hardened steel (56-62 HRC) by using coated carbide tool inserts. Apart from preheating, two other machining parameters such as cutting speed and feed were varied while the depth of cut was kept constant. Results: Tool wear phenomenon and machined surface finish were found to be significantly affected by preheating temperature and other two variables. Preheating temperature of 335

【 授权许可】

Unknown