| 摘要 |
PROBLEM TO BE SOLVED: To shorten cycle time by carrying out control for exhibiting the acceleration performance of a main spindle to a maximum limit with a simple configuration in a machine tool for executing tap processing by the synchronous operation of the main spindle and a feed shaft.SOLUTION: A main spindle control unit 18 includes an initial operation control unit 30 for accelerating and rotating a main spindle 12 from a processing start position to a target screw depth with a highest rotational speed V0 fed from a numerical value control unit 16 set as a target value at maximum performance, a maximum acceleration detection part 32 for detecting maximum acceleration A0 based on a rotation position FBS during accelerated rotation, a residual rotation amount detection part 34 for detecting the residual rotation amount Sr of the main spindle 12 from a current position to the target depth based on a total rotation amount S0 fed from the numerical value control unit 16 and the rotation position FBS, a current speed detection part 36 for detecting the current speed Vc of the main spindle 12 based on the rotation position FBS, and a positioning operation control unit 38 for decelerating and rotating the main spindle 12 at maximum performance to reach the target depth based on the maximum acceleration A0, the residual rotation amount Sr, and the current speed Vc after the accelerated rotation.SELECTED DRAWING: Figure 1 |
