摘要
磨具的磨削层结合剂中的相变材料可以改变磨削层的热性能,进而影响磨削层与工件间的热量分配。通过建立相变材料相变过程的两相复合材料等效比热容理论模型,以及石蜡/环氧树脂复合材料与蓝宝石工件的传热数值模型,分析相变材料体积分数对磨削层热性能以及磨削层与工件热量分配的影响。结果显示:复合材料等效比热容理论值与仿真值误差小于2%,验证了该理论模型的有效性。随着相变材料体积分数的增加,磨削层的等效比热容逐渐增大,工件分配的热量逐渐减少。与磨削层强度分析结合,确定相变材料体积分数的最优值为26%。
The phase change material(PCM) in the grinding layer binder of the grinding tool can change the thermal properties of the grinding layer, and then affect the heat distribution between the grinding layer and the workpiece. In this paper, we establish a theoretical model of equivalent specific heat capacity of two-phase composite material considering the phase change process of PCM, and a numerical model of heat transfer between paraffin/epoxy resin composite material and sapphire workpiece. Then we analyze the influence of the volume fraction of the PCM on the thermal characteristics of grinding layer and heat partition of grinding layer and workpiece. The results show that the error between theoretical value and simulation value of composite equivalent specific heat capacity is less than 2%, which verifies the validity of the theoretical model. As the volume fraction of the PCM increases, the equivalent specific heat capacity of the grinding layer increases and the heat transferred to workpiece decreases. Combining with the strength analysis of grinding layer, the optimum volume fraction of PCM is 26%.
作者
王纯贤
郑梦龙
吴喆
章凯羽
刘志峰
朱衍飞
WANG Chunxian;ZHENG Menglong;WU Zhe;ZHANG Kaiyu;LIU Zhifeng;ZHU Yanfei(College of Mechanical Engineering, Hefei University of Technology, Hefei 320009, China;Intelligent Manufacturing Institute, Hefei University of Technology, Hefei 320088, China)
出处
《机械》
2019年第5期1-7,共7页
Machinery
基金
国家自然科学基金(51605129)
安徽省自然科学基金(1708085ME109)
中国博士后科学基金(2015M581977)
关键词
相变材料
化学机械磨削
比热容
热量分配
phase change materials
chemo-mechanical grinding
specific heat
heat partition
