Abstract
Ultrahigh strength steel was a structural material with extremely high tensile, shear and yield strength. While, it was difficult to machining due to the excellent mechanical properties. There was serious problem in high quality and high efficiency machining of ultrahigh strength steel in actual production. In this paper, the effect of different turning parameters on cutting force, surface roughness, chip form and tool wear during dry turning of a typical ultrahigh strength steel were experimentally investigated, and the cutting parameters were optimized, then the empirical formulas of the cutting force and surface roughness Ra were also obtained. Both the cutting forces and surface roughness Ra were decreased as the increase of cutting speed, and increased as the feed rate and cutting depth. Within the selected range of machining parameters in the experiments, all the chips were serrated. The normal wear stage of the tool was not obviously, and the tool life was about 2000 s, which fulfilled the needs of actual production. This study gave experimental support for the parameter optimization during dry machining of ultrahigh strength steel, comprehensive considering processing efficiency, tool wear and machined surface quality. DOI: http://dx.doi.org/10.5755/j01.mech.23.6.19851
Highlights
Ultrahigh strength steel is a new kind of structural materials [1] developed from constructional alloy steels, which with the tensile strength over 1500 MPa or yield strength over 1380 MPa
Three-dimensional cutting forces and the resultant force were basically decreased as the increase of cutting speed, and increased as the increase of feed rate and cutting depth
When cutting speed was over 160 m/min, the cutting force showed a slightly increase trend, that was mainly because that the cutting temperature was too high with high speed, which resulted in serious tool wear
Summary
Ultrahigh strength steel is a new kind of structural materials [1] developed from constructional alloy steels, which with the tensile strength over 1500 MPa or yield strength over 1380 MPa. Ultrahigh strength steel is a typical difficultto-cut material [3]: as the shear strength is very high, the cutting force will rise with tool violent vibration; due to low thermal conductivity, the cutting temperature is very high, resulting in the machining error by thermal deformation of the workpiece. There are many factors that affect the cutting efficiency and surface quality [6,7,8], such as cutting tool material, cutting tool geometry, cutting parameter, cutting fluid, etc. The influence of cutting parameters on cutting force and surface quality during dry turning process of ultrahigh strength steel 42CrMo was investigated. This study gave experimental support for process parameters optimization, comprehensive considering processing efficiency, tool wear and machined surface quality
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