Analysis of surface roughness during Machining of AISI H-13 steel using EDDFG

Abstract

Electric Discharge Machining (EDM) is well known AMP as it can easily machine the complex shaped, hard, and difficult to machine materials. EDM involves removal of material by thermal erosion, due to which recast layer may be formed and the surface quality may degrade. To reduce recast layer generation and improvement of surface quality, Electric discharge face grinding is developed. Electric discharge face grinding process is a HMP in which material removal occurs by mechanical abrasion as in conventional grinding process and thermal erosion as in EDM. Surface roughness is important aspect in analyzing the surface quality of the processed product. This paper shows the impact of input parameters viz. Ton, Ip, and Toff on ASR during machining of AISI H-13 steel workpiece. Influence of tool RPM on MRR is also studied. After performing experiments using ‘one parameter at a time’ strategy, it was found that by increasing tool RPM, MRR first increases then decreases. It was also found that by increasing Ton & Ip, ASR increases and by increasing pulse off time, average surface roughness first decreases then increases.