| 摘要 |
PURPOSE:To prolong the life of a hob and enhance the productivity by changing the hob feed speed in accordance with the cutting resistance to the work. CONSTITUTION:A hob 5 and a work 2 are rotated in linkage by a driver device 9. A feed table 6 is moved by a DC feed motor 29, which is equipped with a pulse generator 33 and tacho generator 34. In accordance with signals sensed by the pulse generator, a numerical control device 35 emits a command to enlarge the amount of feed in the initial and final periods, where the cutting resistance used is small, and the DC servo control device 36 will compare the command signal with the signal of actual number of revolutions given by the tacho generator 34. |
