超高速磨削的热传递机制探讨

Approach to Heat Transfer Mechanism in Ultra High Speed Grinding

根据对传热过程的分析， 提出了超高速条件下高效深磨的理论热模型·基于该模型， 将磨削区表面最高温度与砂轮复合体表面最高温度相联系， 得出了工件表面最高温度及传入工件热比率与磨削速度的关系·指出超高速磨削中表面温度的临界速度效应主要是由于传入工件热比率随磨削速度的提高而不断降低造成的·

According to the analysis on the heat transfer process of high efficiency deep grinding(HEDG), an analytical thermal model of HEDG under ultra high grinding speed was presented. By matching the maximum surface temperature of workpiece derived from this model to the maximum surface temperature of grinding wheel composite as done in Lavine's simple thermal model, the relation of maximum surface temperature and energy partition of workpiece to grinding speed was obtained. The continuous decreasing of energy partition to workpiece with increase of grinding speed is responsible to the critical speed effect of workpiece surface temperature in HEDG.