镍基单晶高温合金微磨削形貌仿真及实验研究

基于单个磨粒微磨削几何运动学规律和最小值函数，推导出全局磨粒的微磨削运动轨迹表达式，建立工件微磨削加工表面的包络线函数集合，得出磨削加工微观形貌仿真预测模型，并通过开展DD5镍基单晶高温合金微磨削加工工艺实验验证模型结果的正确性.实验结果表明:仿真预测微观形貌与实际微观形貌具有相似特征，仿真预测线轮廓高度与实际加工微磨削线轮廓高度误差为0.2~0.3μm；不同磨削参数下的表面粗糙度对比结果也表明预测模型与实验所得的表面粗糙度变化趋势一致.

Morphology Simulation and Experimental Study on Micro-grinding of Nickel-Based Single Crystal Superalloy

Based on the regularity of geometric kinematics for a single abrasive micro-grinding and the minimum function， the global abrasive micro-grinding trajectory expression was deduced. The envelope function set of a micro-grinding workpiece surface was established， the simulation prediction model of grinding processing microstructures was obtained， and the correctness of the model was verified by conducting the micro-grinding processing experiment of DD5 nickel-based single crystal superalloy. The experimental results showed that the simulated predicted micro-morphology has similar characteristics to those of the actual micro-morphology. The error between the simulated predicted line contour height and the actual machined micro-grinding line contour height is 0.2~0.3μm. The comparison results of surface roughness under different grinding parameters also showed that the prediction model is consistent with the experimental results.