| 摘要 |
PURPOSE:To reduce vibration and noise in cutting and improve its surface roughness, by arithmetically comparing the present rotary speed signal of a cutting tool with its programmand speed signal so as to control a driving power source for rotating the cutting tool in accordance with this arithmetic compared result when the cutting tool of a boring machine is rotated. CONSTITUTION:When a boring machine performs its boring work by causing a motor 4 through a transmission gear 5 to turn a spindle 2 equipped in a spindle head S and mounting a cutting tool 1 for boring, a present rotary speed of the cutting tool 1 is derected in a present rotary speed detecting part 18 by a pulse signal of rotation from a rotation pluse detector 17. An arithmetic part 22, arithmetically comparing this present rotary speed with a programmed mode of rotary speed from a programmed speed memory unit 21, outputs a deviation signal to a correcting part 23. Then a correction signal obtained here is given to a control part 24, correcting a motor control signal due to a setter part 20 thus controlling the motor 4 so that the cutting tool 1 for boring may be rorated in the programmed mode of rotary speed in a present speed of the cutting tool 1. |
