高速磨削热力强场作用下相关机理研究  

Study of Mechanism in Thermodynamic Coupling Field of High Speed Grinding

作　　者：张磊[1] 葛培琪[2] 

机构地区：[1]山东大学机械工程学院高效洁净机械制造教育部重点实验室,济南市博士250061 [2]山东大学

出　　处：《工具技术》2010年第4期25-28,共4页Tool Engineering

基　　金：国家重点基础研究发展计划(937计划)资助项目(2009CB724403)

摘　　要：在高速磨削中,磨粒高速冲击表层材料,在热力强场作用下表层材料产生的动态行为激变是高速磨削的一个重要特征。本文通过对高速磨削力场、温度场和绝热剪切、准流动相冲击成屑、材料本构关系、微裂纹扩展等高速磨削材料变化行为机理进行深入探讨,得出以下结论:在高速磨削过程中,材料的动态变化行为不同于普通磨削,需要基于对高速磨削热力强场作用的研究,揭示材料动态行为变化机制;需要对高速磨削过程中磨粒、磨屑和材料表层的热量分配比和温度场变化进行深入研究,以解释磨削温度在砂轮线速度超过某一临界值后开始下降的原因;需要深入研究高速磨削热力强场作用下塑性材料的微裂纹扩展机制,揭示塑性材料的塑脆转变行为。Because the abrasives shock the surface layer in high speed grinding,the material dynamic behavioral transformation in thermodynamic coupling field is an important characteristic in high speed grinding. On the basis of high speed grinding force field,temperature field,and material dynamic behavioral transformation mechanisms of adiabatic shear,chip-formation due to shock in quasi-fluid phase,material constitutive relation and micro-crack extension,the conclusion is that material dynamic behavioral transform in high speed grinding is different from general grinding,so dynamic behavioral transform mechanism need to study deeply; energy partition of abrasive,chip and material and temperature field in high speed grinding need to study to explain the cause of grinding temperature dropping when grinding speed higher than critical speed; micro-crack extension mechanism of plastic material in thermodynamic coupling field is need to study to find the plastic-brittle behavioral transformation.

关 键 词：高速磨削 热力强场作用 动态行为变化 

分 类 号：TG580[金属学及工艺—金属切削加工及机床]