NC data editing method using transformation matrix and conversio

Details NC data editing method using transformation matrix and conversio NC data editing method using transformation matrix and conversio

1991-01-29

1994-03-22

Smith, Jerry

Boots, shoes, and leggings

36447436, G05B 1942, G06F 1546

Patent

active

052970230

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION



FIELD OF THE INVENTION

The present invention relates to an NC data editing method, and more particularly, to a method capable of speedily and accurately editing NC data, e.g., for modification of a movement path of a controlled object.


DESCRIPTION OF THE RELATED

In numerical control, previously originated NC data is executed by a numerical control device to produce a control output corresponding to a target movement path of a controlled object such as a tool, and a drive mechanism is controlled by a servo system which responds to the control output, so that the controlled object is moved along the target path. Therefore, if the movement path generated in accordance with the originated NC data must be modified, the NC data must be so edited as to modify associated coordinate value data in the NC data. In conventional NC data editing, coordinate value data individually representative of a group of points specifying a desired movement path are individually determined by manual calculation in accordance with coordinate value data individually representative of a group of points specifying an original movement path and a required amount of shift from the original path to the desired path. Then, the newly calculated coordinate value data is set in place of the original coordinate value data. The manual calculation for determination of the new coordinate value data, however, is complicated, requires much time and labor, and in addition, is liable to error. Thus, the reliability of the edited NC data is low.
In the case of using two robots disposed symmetrically with respect to the axis of a workpiece to move two tools along movement paths symmetrical with respect to the workpiece axis so as to perform a required machining operation, it is conventionally known to edit NC data originated for one of the robots by subjecting the NC data to a mirror conversion process so as to originate NC data for the other robot. Conventionally, in this case, post-mirror-conversion coordinate value data are individually determined by manual calculation in accordance with coordinate value data constituting the original NC data and data specifying a mirror plane, and then the NC data is edited by using the coordinate value data thus calculated. Accordingly, similar problems are encountered as in the case of the aforementioned NC data editing for the movement path modification.


SUMMARY OF THE INVENTION

An object of the present invention is to provide an NC data editing method in which editing of NC data, e.g., for modification of the movement path of a controlled object can be effected speedily and accurately.
In order to achieve the above object, an NC data editing method according to the present invention comprises the steps of: (a) additionally programming a conversion command in originated NC data; (b) additionally programming a conversion cancellation command in the NC data; (c) automatically calculating and defining a transformation matrix when the conversion command is read from the NC data; (d) converting a point associated with a movement command by using the transformation matrix, thereby automatically obtaining a post-conversion point, every time the movement command is read from the NC data, before the conversion cancellation command is read after the transformation matrix is defined; and (e) automatically rewriting the NC data by using the post-conversion point.
Preferably, the conversion command is a positional conversion command composed of a positional conversion command code, coordinate value data individually representative of a group of reference points which are permitted to be arbitrarily set, and coordinate value data individually representative of a group of corresponding points corresponding individually to the group of reference points, the number of reference points which constitute the group of reference points being selected so as to be identical with the dimension of the NC data. Alternatively, the conversion command is a mirror conversion command composed of a mirror c

REFERENCES:
patent: 3809868 (1974-05-01), Villalobos et al.
patent: 4734864 (1988-03-01), Kawamura et al.
patent: 4862381 (1989-08-01), Shibata
patent: 4870595 (1989-09-01), Otsuki

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