| 摘要 |
PROBLEM TO BE SOLVED: To appropriately control pressure contact of grinding tools against the inner circumferential face of a hole to be worked at a final finishing work by measuring the changing rate of worked diameter per unit time, and controlling expansion pressure for honing based on the measured results. SOLUTION: When expansion pressure is reduced so as to execute a final finishing work, air is jetted from a sizing nozzle 13 to the inner circumferential face of a worked hole WH, back pressure at this time is detected by a A/E air-electric converter 15, and the changing rate of worked diameter per unit time is computed by a computation processing device 19. When this changing rate is larger than a set value, expansion pressure is reduced, in addition, the peripheral speed and the stroke speed of honing tools 1 are reduced, and hence the honing work is continued while the working condition is lowered so as to reduce a working quantity per unit time. |
