Mori Seiki Co., Ltd.

Hideki Takedomi

Makoto Fujishima

A machine tool controlled to restart automatic operation for machining a workpiece from an interrupted point after the machine tool, which has been automatically operated by NC program commands, is caused to interrupt the automatic operation. The NC program commands are classified into a plurality of main groups with respect to the contents of motions for changing the machine state of the machine tool. When the automatic operation of the machine tool restarts after the automatic operation has been interrupted halfway, an order of execution of the NC program commands is determined such that the main groups are arranged in a prescribed order of execution, for automatically generating a machine state restoration command. The automatic operation of the machine tool can restart from the interrupted point without the need for the operator to manually generate or correct a command for restoring the machine tool to its machine.

Method of and apparatus for controlling machine tool for restarting automatic operation

A controller for machine toolhas a program analyzing sectionfor analyzing a machining program and extracting a fixed cycle command, a parameter setting sectionfor, on the basis of the extracted fixed command, determining an accuracy level being graded into a plurality of grades depending on how high machining accuracy is prioritized as compared with machining time in machining and setting parameters corresponding to the determined accuracy level and relating to control of the operation of a feed mechanism, and a drive control sectionfor controlling the feed mechanismon the basis of the extracted fixed cycle command and the set parameters. The parameter setting sectioncalculates an arc-shaped movement trajectory of a tool moving around a virtual corner portion where two straight lines intersect with each other which corresponds to the parameters, and determines the accuracy level based thereon.

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Nara, Japan

Hideki Takedomi