基于裂纹扩展效应的切槽-推磨复合加工陶瓷方法的可行性研究

Feasibility Study of Cutting and Axial Pushing-Grinding Process Technology Based on the Crack Propagation

提出了基于裂纹扩展效应的切槽-推磨复合陶瓷加工新方法,完成了借助金刚石砂轮片切割预制缺陷和小砂轮轴向推磨加工工艺实验。通过收集推磨后的块状碎屑,测定其在总去除质量中所占比例,作为裂纹扩展效应在材料去除中所占比重的依据。通过单因素实验着重研究了凸缘厚度、凹槽深度、砂轮转速和工件转速四个加工参数对块状屑占比和推磨力的影响规律。借助激光共聚焦显微镜和金相显微镜测定,分析了该方法的加工机理,即该加工方法去除陶瓷材料是在预制缺陷、裂纹扩展和砂轮磨削的综合作用下完成的。

A new technology which was called a cutting and axial pushing-grinding process technology based on crack propagation was put forward.The experiments that defect was prefabricated with diamond grinding wheel piece and axial pushing-grinding processing with small common grinding wheel was completed.The proportion of block-like debris＇ weight was determined by collecting the block-like debris,which can be used as basis of the proportion of crack propagation effect.The single factor experiment is focused on the influence law how four processing parameters such as flange thickness,recess depth,workpiece speed and grinding wheel speed to affect two processing indexes such as the proportion of block-like debris and the axial pushing-grinding force.With the help of laser scanning confocal microscope and metallographic microscope,the principle of the processing method was analyzed,which was the comprehensive function of precast defect,crack propagation and grinding wheel.