| 摘要 |
PURPOSE:To improve the working accuracy and to shorten the working time, by controlling the pressurizing condition onto the work of a grindstone in accordance to the margin of work measured prior to the start of working. CONSTITUTION:A work 1 is supported between supporting rolls 3 then the dimension of the work 1 is measured by a differential transformer 4 and provided as a dimension signal S1 to a control means 25. When the control means 25 decides that the margin of work 1 is large, only a solenoid 11c is energized to feed high pressure air to a pressurizing cylinder 5 thus to press a grindstone 6 against the work 1 with high pressure. When the work 1 is worked to first dimension, first dimention signal S5 is outputted from a control circuit 39 to close all exchange valves 11, 12, 13 in a pressure regulating means 10 thus to control the air pressure to predetermined low finish work pressure level through the regulating valve 20. After predetermined time the work 1 is brought to the finish dimension to complete the work. |
