Abstract
Surface hardening plays an important role in the evaluation of surface quality and performance of wear-resisting of components. Surface hardening of aluminum alloy 7050 is researched in high speed milling by means of micro-hardness experiments and formula. It is greatly influenced by different cutting speed and material. The relationship between surface hardness and cutting parameters are obtained and studied. The surface hardening is particularly sensitive to cutting speed and slightly to the width of cut. The effect of depth variant of machined layer on micro-hardness is analyzed, and the equation between work hardening capacity and layer depth is established to predict the harden layer depth in different conditions. The experiment results show that the work hardening capacity and layer depth in high speed cutting is greater than that in conventional cutting.
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