断续磨削时的脉动温度场解析

ANALYSIS OF THE PULSATING TEMPERATURE FIELD DURING INTERMITIENT GRINDING

文章构造了周期变化的移动热源模型,并引进卷积概念建立了计算断续磨削时工件表层非稳态脉动温度场的理论公式。该公式可以包容连续磨削的情况,且可计算任意时刻的瞬态温度分布。

A periodic changing and moving heat source model is designed. Moreover, a new theoretical formula for calculating the intermittent grinding temperature field is obtained by use of the faltung integral concept. The recommended formula is of general significance. It is suitable for both intermittent and conventional continuous grinding. It is noteworthy that by use of this new formula not only the final temperature distribution of the workpiece surface layer but also the whole time-course of the temperature distribution during grinding can be found. With the new formula the temperature distribution characteristic of workpiece surface during intermittent grinding, the effect of the intermittent ratio and period on temperature distribution and the reducing temperature effect of a segmental or slotted wheel are investigated in depth. Finally, through the experiment it is confirmed that the new formula accords with the practice of intermittent grinding.