| 摘要 |
PURPOSE:To attain smooth thread cutting by adding the residual distance of a deviation counter at the end of the 1st thread cutting movement command as the 2nd or after thread cutting approach run distance. CONSTITUTION:The deviation counter 5 in the interactive numerical control device outputs the difference between a movement command value from a CPU4 and a position feedback value from a machine movable part to a speed controller 8 through a D/A converter 7 to obtain the lead of a screw and a necessary speed. The thread cutting is repeated, and at the 1st cutting 1, the center part of the screw is cut out while referring delay sampling as its approach run distance. At the 2nd cutting or after, cutting 2 is repeated along the one side of the screw, and at the final cutting, the finish cutting of the center part is again peformed to complete the screw. Since the residual value of the deviation counter 5 at the end of the 1st movement command is equal to the distance up to the end, the residual value is stored in a delay register 6 to use the value as the 2nd or after approach run distance. |
