口腔修复体中的磨牙牙冠具有复杂的型面结构,其设计和加工工艺均有其独特性.文中利用逆向重构技术,对磨牙牙冠进行反求测量获得其点云数据,基于点云数据重建零件模型和完成再设计.然后结合理论分析、仿真和实验的方法分析其加工工艺性,选择合理的切削参数以减少加工过程中的刀具及工件变形对工件加工质量的影响,及由于刀具和零件的颤振导致的加工误差.最后针对磨牙牙冠的特点,生成合适的数控刀轨,加工出符合设计要求的实物.该分析方法对同样复杂的零件的加工具有参考价值.

Molar crown used in dental restoration is unique in design and processing due to its complex profile structure.In this paper,by using the reverse reconstruction technology,the point cloud data of molar crown are obtained,which are used to reconstruct and re-design part models.Then,by analyzing the processing technology through theoretical analysis,simulation and experiment,reasonable milling parameters are selected to eliminate the effects of tool and workpiece deformation on the milling quality and to reduce the machining error due to the chatter of part and tool.Finally,in view of the characteristics of molar crown,a suitable NC tool path is generated,and a molar crown meeting the design requirements is machined.The proposed method gives a reference to the machining of parts with complex structure.