Abstract
This paper aims to clarify the condition under which workpiece burning occurs in creep feed grind-ing and by connecting the result to obtain an optimal grinding condition which can avoid any occurrence of burning. With continuing operation, the grinding wheel becomes dull and workpiece burning takes place when the grinding energy flux φ (grinding energy per unit contact area per unit time) exceeds a critical value of φb. According to the experiment, the value of, was about 7-8 J/mm2·s and was not influenced by the wheel, the grinding manner nor the contact length of wheel and workpiece, but was solely a function of dimen-sionless grain depth of cut hg=- (Vw/Vs) a/D. The φ value increases from an initial φ0 almost linearly with the path length of grain L. Therefore the φb as well as the rate of increase of φ with L must be as small as possible in order to avoid workpiece burning. Taking all the above factors into consid-eration, nomographs to indicate the optimal grind-ing conditions in view of burning are presented.
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