SEQUENCE CONTROL METHOD IN NUMERICALLY CONTROLLED GEAR HOBBING MACHINE

摘要

PURPOSE:To attain the unmanned operation of a gear cutting work line by transferring work to a subprogram for processing a trouble at the generation of a trouble in the life of a hob cutter or defective working, and after completing the processing, restoring the work to a normal program. CONSTITUTION:A hob cutter shiftig program for the abnormality of a hob cutter is executed, and if the signal level of an AE detector exceeds a reference value and the signal is in the OFF state at the confirmation of the abnormality of the cutter at a position A, an instruction Jump D is executed. The program D is formed to shift the hob, so that a new cutter is prepared. When the defect of a work material, a program for processing the work is executed and the drop of a supporting arm is checked at the position A. If a limit switch is in the OFF status, the instruction Jump D is executed. When the clamping of the work has been completed at the 2nd drop in the program D, the program is returned to a main routine B. Then, the normal program continues to execute.