Abstract
Creep-feed grinding operations require a copious fluid flow for cooling at the grinding zone. Cooling effectiveness in creep-feed grinding depends upon a critical burn-out limit beyond which fluid film boiling occurs, cooling becomes ineffective, and the temperature rises catastrophically. In the present paper, a thermal analysis is presented to predict the burn-out heat flux limit at a critical temperature for film boiling. The thermal model considers the transient workpiece and fluid temperatures during a grinding pass and the energy partition to the workpiece. Measurements of the burn-out heat flux are found to be in good agreement with theoretical predictions over a wide range of creep-feed grinding conditions.
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