Abstract
Electric pulse-assisted cutting (EPAC) can reduce the hardness of the workpiece, improve the tribological state of the tool-workpiece/chip interfaces, and enhance the machinability of the workpiece material. Hardened bearing steel has a hardness higher than 60 HRC, so the hardened bearing steel has an extremely bad machinability. This paper carried out an experimental study on electric pulse assisted hard turning (EPAHT) of hardened bearing steel, and the tribological property of the turned hardened bearing steel was also explored. Results shown that compared to conventional hard turning, the EPAHT reduced the surface roughness of hardened bearing steel by 44.2 %. The workpiece surface work-hardening rate was reduced by 3.6 %, the thickness of the workpiece surface metamorphic layer was increased by 91.4 %, the friction coefficient of the workpiece surface was reduced by 20 %, the wear mark depth was decreased by 91 %, a uniform and clean wear morphology of the workpiece surface wear appeared. The surface friction and wear performance of hard-turning of hardened bearing steel were significantly enhanced by the EPAHT.
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