Abstract
Grind-hardening is a new technical principle, which can implement surface hardness directly by the composite process of thermal load and mechanical force during the grinding process. The hardness changes on hardening layer are a significant impact on the surface integrity of the workpiece, fatigue strength, and wear resistance. Therefore, studies on hardening layer hardness and uniformity mechanism for the workpiece play a practical engineering significance. In this paper, an experiment of grind-hardening on 45 steel is done as a research subject. The workpiece microstructure is observed and surface hardness is measured firstly. Then, further analysis of the changes of the surface hardness and grinding parameters’ impact on the hardness are studied. Hardness uniformity of the mechanism of the hardening layer is studied emphatically in the paper. Finally, finite element method, combined with the hardness superposition principle, is applied to simulate the temperature distribution and transient temperature changes and predict the hardening layer hardness during the grinding process. The simulation results were verified by experiments.
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