科研之友
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摘要
The surface heat transfer exhibits highly nonlinear characteristic during minimum quantity lubrication (MQL) grinding owing to the high grinding surface temperature gradient, the complicated movement characteristic of the spray and the random droplet size. Based on the atomization mechanism, the influencing factors about the velocity and the diameter of the droplet were analyzed. The grinding zone was divided into four different regions according to the heat transfer mechanism of the droplet at different surface temperatures, namely non-boiling heat transfer region, nucleate boiling heat transfer region, transitional boiling heat transfer region and stable film boiling heat transfer region. Furthermore, the related mathematical models of heat transfer in the grinding zone were established. The surface grinding experiment is carried out; a good agreement is found between the simulative result and experimental measuring result of the surface temperature during MQL grinding, which shows that the theory of surface heat transfer coefficient during MQL grinding is creditable.
