| 摘要 |
PURPOSE:To increase the quantity of non-grinding feed and reduce a grinding cycle time by providing a non-grinding feed control means which inputs a signal for shifting from a non-grinding feed to a grinding feed immediately before a grinding wheel is brought into contact with a workpiece, into a cutting control means. CONSTITUTION:At the time of feeding a coolant 9, an output signal from a load detecting means 11 with a grinding wheel 3 being placed slightly apart from a workpiece 4 in its grinding completed condition, is stored in a memory means 12. And, the load value of an output signal from the load detecting means 11 at the time of non-grinding feed on the following grinding process, is compared with the stored value stored in this memory means 12, by an operating means 14, and a signal is given when the load value becomes equal to the stored value. Based on this output signal, a signal for shifting from a non- grinding feed to a grinding feed is inputted into a control means 17 through a non-grinding feed control means 17, to make the grinding wheel 3 carry out grinding feed at a feed speed lower than non-grinding feed. Thereby, the quantity of non-grinding feed can be increased, reducing a grinding cycle time.
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