Abstract
For the purpose of clarifying the truing effect of crushing, crush roll wear rate during crushing and grinding wheel wear caused by grinding are measured for various crushing conditions by controlling the sliding speed between crush roll and grinding wheel. Results are as follows : (1) Crush roll wear rate increases with an increase in the sliding speed, and decreases with an increase in the crush roll infeed rate when the sliding speed is constant. (2) Rate of grinding wheel wear caused by grinding increases with an increase in the crush roll infeed rate per one revolution of grinding wheel, and becomes smaller when the sliding speed increases. (3) An averaged value of the sliding speed over the crush roll profile can be minimized by shifting the rolling pitch point between grinding wheel and crush roll to an optimum position with a forcible manner, and this results in the improvement in grinding wheel profile accuracy. Furthermore, it is revealed that an application of creep feed grinding onto the crush formed grinding wheel contributes to the improvements in grinding wheel wear rate, profile accuracy, and finished surface roughness as compared with conventional plunge grinding.
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