缓磨时工件烧伤过程的计算机仿真研究

A Study on Workpiece Burn Process during Creep Feed Grinding by Computer Simulation Technique

在关于缓磨时的磨削热、接触弧区换热过程以及工件表层非稳态温度场的深入研究的基础上构造了一个可用于计算工件表层温度场畸变历程的数学模型，并据此完成了缓磨时工件烧伤过程的计算机仿真研究。仿真结果与缓磨时的实际烧伤过程吻合良好。本文率先阐明了缓磨烧伤的热机理，并证实了缓磨烧伤是一典型的渐变过程，它有明显的前兆特征，因而是可以被预报和控制的。此项创造性工作可以被看作是对磨削基础理论的一项重要贡献。

The creep feed grinding has a vast reservoir of potentialities itself. However,since mechanism researches fall behind the production.application,its potentialities have not been fully developed.For instance in grinding circle at home and abroad,the creep feed grinding burn restricting both machining quality and efficiency has been universally considered as one of the most elusive and troublesome problems up to now.In this paper,on the basis of deepgoing researches on grinding heat,heat transfer process of contact zone and unstable-state temperature field in workpiece surface layer during creep feed grinding, a simulation mathematical model which can be used to calculate the time-course of temperature field distortion in workpiece surface lay6r has been structured,and on these grounds the computer simulation studies of workpiece burn process during creep feed grinding have been completed.The simulation results accord well with the practice of burn process during creep feed grinding. The results in this paper take the lead in explaining the heat mechanism of burn course during creep feed grinding,and showing that the creep feed grinding burn is a typical slow-changing course and has obvious premonition characteristics,therefore it can be predicted and monitored. This creative work can be regarded at an important contribution to the basic theory of grinding.