| 摘要 |
PCT No. PCT/JP88/00724 Sec. 371 Date Mar. 22, 1989 Sec. 102(e) Date Mar. 22, 1989 PCT Filed Jul. 20, 1988 PCT Pub. No. WO89/01194 PCT Pub. Date Feb. 9, 1989.A first NC program (NCP1) is created having, in united form for every process (MP1-MP3), tool selection commands (ATC1-ATC3) for automatically selecting tools used in the respective processes and machining comands (MC1-MC3) for machining performed by the tools. The first NC program is stored in a memory of an NC apparatus. The first NC program (NCP1) is then converted into a second NC program (NCP2) having a comand M06T &squ& &squ& &squ& . DELTA DELTA DELTA (PTCM1-PTCM3) for holding the tool used in the next process in readiness at a standby position. Thereafter, the NC apparatus executes numerical control based on the second NC program (NCP2). During execution of the second NC program, the NC apparatus inputs, to the machine side, a tool number DELTA DELTA DELTA of a tool for the next process read before the machining command (MC1-MC3) of the present process, causing an automatic tool changing apparatus to hold the tool for the next process in readiness at a standby position, and then executes machining based on the machining command of the present process.
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