小切深磨削表面微结构损伤机理及影响

针对小切深磨削条件下工件表面微结构损伤，理论分析了磨削残余应力与磨削微裂纹之间的关系;运用有限元仿真分析法，获得不同磨削条件下45钢工件表面残余应力的数值及其分布云图，并分析不同磨削深度和冷却条件对其磨削残余应力的影响.最后基于不同的磨削条件，对45钢试件进行磨削试验，通过测量不同试件的表面残余应力，验证仿真结果的正确性;同时，通过观测不同磨削参数下的试件表面SEM图，研究不同磨削表面的微结构损伤.试验结果表明，采用适当的磨削参数和条件可以有效减少和避免磨削表面微结构损伤.

Influence of Small Depth Cut on Grinding Surface Micro structure Damage and Mechanism

In view of grinding surface micro structure damages under small depth cut， the connection between ground residual stress and micro crack was theoretically analyzed. Surface residual stress and its cloud distribution were simulated under different ground conditions for 45 steel workpieces using finite element analysis， and then effects of grinding depth and cooling conditions on the grinding surface residual stress were discussed. At last， grinding experiments were conducted for 45 steel workpieces under different conditions to verify the simulation results by measuring the specimen surface residual stress. At the same time， the grinding surface micro structures with different grinding parameters were studied using SEM. The test results show that adopting appropriate grinding parameters and conditions can effectively reduce and avoid the grinding surface micro structure damages.