氟金云母陶瓷车削中脆性材料切削热传导理论模型的研究

通过分析可加工陶瓷切削温度变化规律，提出脆性材料在车削中存在着两个不同的温升阶段，反映了切削系统存在的热传导及热积累效应。根据热传导基本理论，建立以刀具-工件接触点为移动热源的脆性材料切削热传导理论模型，结合微元法量化脆性材料车削中的热量分配，采用能接近实际车削中温度场变化形式的镜像热源原理，求解脆性材料切削温度的二次跃迁值。用PCD(聚晶金刚石)刀具车削氟金云母陶瓷，进行切削验证实验，结果表明，脆性材料切削热传导理论模型能够较准确地求解切削温度的二次跃迁值，并反映陶瓷等脆性切削温度场的变化趋势。

Theoretical Model of Heat Conduction of Brittle Material in the Process of Turning Fluorophlogopite Ceramics

By analyzing the changing rule of machinable ceramic cutting temperature, it is proposed that there are two different temperature rise stages in the turning of brittle materials, which reflect the heat conduction and heat accumulation effect of the cutting system. Based on the basic theory of heat conduction, the theoretical model of brittle material cutting heat conduction with the contact point of tool and workpiece as the moving heat source is established. The heat distribution in brittle material turning is quantified by the micro element method. The principle of mirror heat source which can close the change of temperature field in the actual turning is used to solve the secondary transition value of cutting temperature of brittle materials. Using PCD cutting tool to turn fluorophlogopite ceramic, the cutting verification experiment is carried out. The results show that the theoretical model of heat conduction of brittle material cutting can solve the secondary transition values of the cutting temperature accurately, and reflect the changing trend of the cutting temperature field of the brittle materials such as ceramics.