Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki Kaisha

Toru Takeyama

Masakazu Sagasaki

Kenji Nishiwaki

Tomonori Sato

Hirohusa Kamiya

A numerical control device includes: a control unit controlling movement of shafts of a machine tool by a position command according to a machining program and acquiring position information on the shafts; a monitoring point determination unit determining a monitoring point in the machining program and a monitoring shaft according to the type of an instruction or an instruction related to travel described in the machining program; and a monitoring unit monitoring whether error or deviation based on the position information at the monitoring point of the monitoring shaft exceeds a predetermined threshold, wherein the control unit controls movement of the shafts based on the monitoring result of the monitoring unit, and the numerical control device further comprises an analysis unit presenting whether the cause of the error or deviation is a mechanical factor or a control factor based on the monitoring result and outputting the analysis result.

Numerical control device

To avoid overheating of a spindle motor as easy as possible, a numerical control apparatus measures a cycle time in machining a work (step S), measures a current amount per unit cycle flowing to the spindle motor (steps Sand step S), calculates, on the basis of the measured current amount per unit cycle, a duty cycle time in which suppression of the occurrence of overheating of the spindle motor is guaranteed (step S), determines on the basis of a comparison of the duty cycle time and the cycle time whether the spindle motor overheats (step S), and, when the spindle motor overheats (Yes at step S), delays a start of the next cycle by a wait time setting value Tw obtained by subtracting the cycle time from the duty cycle time (step S, No at step S, and step S).

Numerical control apparatus

A numerical control system using converted data is provided in which changes can be made quickly to the feed rate by speed override and the like, the operation of the machine according to the content of variable data, and workpiece offset data during machining operation. The numerical control system includes a machining-program/internal-processing conversion module for allocating during conversion a command in a machining program to an application program for the numerical control apparatus, a variable/offset conversion module for storing during conversion, with respect to a command such as a variable command and a tool offset command in the machining program, only referencing information for the command, and a conversion data executing module for directly executing, during machining program execution, the internal processing sequentially based on data allocated by the conversion module.

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Tokyo, Japan

Toru Takeyama