Numerical control method and system therefor having override pla

Details Numerical control method and system therefor having override pla Numerical control method and system therefor having override pla

1988-03-16

1990-05-08

MacDonald, Allen

Boots, shoes, and leggings

364188, 364192, G05B 1900

Patent

active

049244035

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to a numerical control method and a system therefor in which it is possible to carry out numerical control automatically repeatedly in accordance with a numerical control program modified by utilization of an override function.
2. Description of the Related Art
There is a numerical control system (hereinafter referred to as "NC system") of a type which is provided with an override function for modifying, during operation of the NC system, control condition parameter values designated by an NC program (part program). Hitherto, for example, in a machine tool controlled by the NC system of this kind, the override function is utilized, during operation of the machine tool, to adjust a cutting feed speed and a spindle speed designated in an NC work program so as to increase and decrease these speeds in compliance with a workpiece working configuration, workpiece material and an actual working state. However, the conventional speed adjustment using the override function is performed by manual operation of override switches (override dials) provided on the NC system, and is effective only against working in course of being currently carried out. Accordingly, if an attempt is made to continue to carry out work under the previously modified working conditions, as far as the same NC work program is used, the override switches must again be manually operated in like manner at a point of time when the feed speed and the spindle speed have previously been modified, to modify these speeds.


SUMMARY OF THE INVENTION

It is an object of the invention to provide a numerical control method and a system therefor having an override playback function, in which once the override function has been utilized to modify a statement of an NC control program, numerical control can be performed automatically repeatedly in accordance with the modified program.
In order to achieve the above-mentioned object, according to the invention, there is provided a numerical control method and a system therefor having an override playback function.
In the numerical control method according to the invention, it is judged whether or not a teaching mode has been entered during execution of a numerical control program. When it is judged that a predetermined command has been given in the teaching mode, override conditions set manually are additionally stated in a corresponding block of the numerical control program, whereby numerical control is automatically carried out in accordance with the set override conditions at execution of the numerical control program.
The numerical control system according to the invention comprises memory means for storing therein a numerical control program in a read/write random-access manner, setting means for manually setting override conditions, manually operable command means for giving a predetermined command, and a manually operable teaching command means for operating the numerical control system in a teaching mode. When the predetermined command is given in the teaching mode, the set override conditions are additionally stated by program editing means into a corresponding block of the numerical control program, and the numerical control program including the set override conditions is written to the memory means. At execution of this program, numerical control is performed automatically in accordance with the set override conditions.
As described above, the arrangement of the invention is such that the program modified by storing the override parameter set in the teaching mode, into the corresponding block of the numerical control program is used to perform the subsequent numerical control. With such arrangement, it is possible to carry out the numerical control automatically repeatedly under the conditions equivalent to those set during the teaching mode. Accordingly, for example, when products the same in configuration as each other are worked in large quantities, it is unnecessary to operate various kinds of override switches

REFERENCES:
patent: 4370704 (1983-01-01), Fukuyama et al.
patent: 4539634 (1985-09-01), Sakai et al.
patent: 4774674 (1988-09-01), Otake

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