Mitsubishi Denki Kabushiki Kaisha

Takahisa Tanaka

Toshio Shimizu

Takeo Teshima

Kazuo Mizutani

A threading control method and apparatus therefor is provided, in which, when carrying out thread-cut machining operations several times at one position, synchronized with main-spindle rotation and controlling movement of a threading spindle, deviations in thread grooves are prevented without correcting programmed commands, machining accuracy is improved, and tool life extended. When a main-spindle single-rotation reference signal and a main-spindle position counter are input to the numerical control apparatus, the present main-spindle position is computed by a main-spindle position computing means, the difference between the main-spindle single-rotation reference signal and control cycles is obtained, as a correction amount, from the computed main-spindle position, by a main-spindle position-correcting meansand a correction is done. A threading-spindle interpolation starting detection meansmonitors whether the main-spindle single-rotation reference signal and the control cycles are synchronous, and when synchronous, interpolation for the threading spindle is started by interpolation meansfor each spindle.

Threading control method and apparatus therefor

In the processing preparation operation for checking a processing program and the tool compensation amount, a series of confirmation operations for all the tools are easily made using the processing program as conventionally used, without having limitations on the creation of the processing program. When a read skip signalis externally input into a numerical control apparatus, the same instruction as stored in mandatory execution instruction storing meansis executed, when commanded in the processing program, until the same instruction as stored in read skip end instruction storing meansis commanded, but the other instructions are skipped, until the same instruction as stored in read skip end instruction storing meansis commanded. Then, when the instruction stored in the read skip end instruction storing meansis read, the instruction and subsequent instructions are executed.

Numerically controlled device

A numerical value control system that controls a machine tool, by calculating a move command from a work program or a work data for a numerical value control unit, and directly inputting the move command to a servo control section ( ) within the numerical value control unit ( ) from the outside of the numerical value control unit ( ). The numerical value control system comprises at the outside of the numerical value control unit: an analyzing unit ( ) which analyzes a work program or a work data; and an interpolating unit ( ) which carries out interpolation for each axis in a position control period of the servo control section based on output information from the analyzing unit ( ) and cut conditions, where by the numerical value control system controls a machine tool by directly inputting a move command of a binary format prepared in advance by the interpolating unit ( ), to the servo control section ( ) within the numerical value control unit ( ).

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Tokyo, Japan

Takahisa Tanaka