磨削弧区热源分布形状研究

发布时间：2019-01-27 14:33

【摘要】：为了研究磨削力与磨削热耦合作用的残余应力场,基于磨粒轨迹分析和磨粒接触分析,采用概率统计的方法建立了磨削弧区热源分布模型。模型分析了磨削弧区热量分配关系,不需预先假设沿磨削弧总热源分布形状及热量分配比一致,即可获得磨削弧区热源分布形状,解决了以往热源分布形状常被假设为矩形和直角三角形,但矩形热源和直角三角形热源并不能准确地描述热源分布形状的问题。采用有限元法仿真分析了工件磨削温度场,采用热成像仪实测了磨削温度场,并将磨削温度场有限元仿真结果和热成像仪测量结果进行了对比分析,结果表明:有限元模拟结果与热成像仪测量结果具有很好的一致性,磨削弧区最高温度预测值与实测值之间的误差在2.24%~15.3%范围内;直角三角形热源并不能准确地描述磨削弧区热源分布形状;磨削弧区热源分布形状更接近四次多项式函数曲线。
[Abstract]:In order to study the residual stress field of the interaction between grinding force and grinding heat, the distribution model of heat source in grinding arc region was established based on abrasive particle trajectory analysis and abrasive particle contact analysis. The model analyzes the relationship of heat distribution in grinding arc region. The shape of heat source distribution in grinding arc region can be obtained without presupposing that the shape of total heat source distribution along grinding arc and the heat distribution ratio are the same. It solves the problem that the shape of heat source distribution is usually assumed to be rectangular and right triangle, but the rectangular heat source and right triangle heat source can not accurately describe the shape of heat source distribution. The grinding temperature field of workpiece is simulated by finite element method, the grinding temperature field is measured by thermal imager, and the results of finite element simulation and thermal imager are compared and analyzed. The results show that the finite element simulation results are in good agreement with the results measured by the thermal imager, and the error between the predicted value of the highest temperature in grinding arc region and the measured value is within the range of 2.24% and 15.3%. Right triangle heat source can not accurately describe the shape of heat source distribution in grinding arc region, and the shape of heat source distribution in grinding arc region is closer to the curve of cubic polynomial function.
【作者单位】：山东大学机械工程学院;山东大学高效洁净机械制造教育部重点实验室;
【基金】：国家“973计划”资助项目(2011CB706600)
【分类号】：TG580.1

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