基于边缘破碎挤压加工工程陶瓷挤压力的研究  

Study of Engineering Ceramic Extrusion Processing Force Based on Edge Broken

作　　者：王望龙[1] 王龙[1] 田欣利[1] 唐修检[1] 王健全[1] 

机构地区：[1]装甲兵工程学院装备再制造技术国防科技重点实验室,北京100072

出　　处：《机床与液压》2016年第1期24-28,共5页Machine Tool & Hydraulics

基　　金：国家自然科学基金资助项目(51105378);装备再制造技术国防科技重点实验室基金项目(9140c850301130c85289)

摘　　要：工程陶瓷边缘碎裂与裂纹扩展是陶瓷加工研究热点之一,目前的研究都是围绕这如何在陶瓷加工过程中避免边缘碎裂和裂纹扩展,而文中的加工方法是巧妙利用工程陶瓷硬脆材料的这个特性进行挤压加工,系统总结和研究了挤压加工的理论基础,对Si_3N_4、Si C、Al_2O_33种工程陶瓷材料进行了单晶压痕挤压边缘破碎实验,并结合有限元仿真结果,探索了压头距离边缘距离、压头的加载速度、凸台宽度、凹槽深度和挤压力之间的关系。结果表明:在一定的加载速度范围内,挤压力与加载速度和凹槽深度成反比,与压头距离边缘位置和凸台宽度成正比。Engineering ceramics' edge broken and crack propagation is one of the hotspot for ceramic processing,and current research revolves always around how to avoid edge broken and crack propagation in the process of ceramic processing. Extrusion processing method was introduced,which makes good use of engineering ceramics' feature of hard and brittle. The theoretical basis of the extrusion processing was summarized and studied systematically. Single crystal indentation squeeze edges broken experiments according to Si_3N_4,Si C,Al_2O_3 engineering ceramics materials were carried out,and combined with results of finite element simulation,the relationship was explored between distance from the pressure head to the edge,loading speed of the pressure head,boss width and groove depth with squeeze pressure. The results show that within a certain range of loading speed,squeeze pressure is inversely proportional to the loading speed and groove depth,and is positively proportional to the distance from the pressure head to the edge and boss width.

关 键 词：工程陶瓷 边缘破碎 裂纹扩展 挤压加工 挤压力 

分 类 号：TG580[金属学及工艺—金属切削加工及机床] TQ174[化学工程—陶瓷工业]