Abstract
The process of grinding the workpiece that has a pulsative distribution of hardness is theoretically and experimentally analyzed to make it clear how the hardness pulse of workpiece affects the dimensional accuracy in plunge grinding. In such grinding the runout is generated on the part of hardness pulse and varies in amplitude through a grinding cycle. The runout begins to be generated simultaneously with the size generation in the matrix of workpiece. The amplitude of runout increases with grinding time in the sparkin state, becomes maximum in the steady state of the part of hardness pulse, and then decreases with grinding time in the sparkout state. The final runout remains on the part of hardness pulse after the effective sparkout grinding. The amplitudes of the maximum runout and/or the final runout are proportional to the amplitude of hardness pulse, and increase with the pulse width smaller than the critical value, becoming constant with the pulse width larger than the critical.
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