Method of creating NC data for turning

Details Method of creating NC data for turning Method of creating NC data for turning

1989-04-25

1991-03-05

Smith, Jerry

Boots, shoes, and leggings

36447421, 36447425, 36447432, G05B 19403

Patent

active

049981960

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

1. Technical Field
This invention relates to a method of creating NC data for turning and, more particularly, to an NC data creation method well, suited for creating approach and withdrawal NC data for turning.
2. Background Art
In turning performed by a lathe, as shown in FIG. 10, a desired tool TL is selected at an index position (turret index point) P.sub.T of a turret TR. The tool is then made to approach a cutting starting point P.sub.A (see the path indicated by the black arrows). The tool is subsequently moved along a commanded path at the completion of the approach operation so as to machine a workpiece WK. The tool is then withdrawn from a cutting end point (which coincides with the cutting starting point) P.sub.A to the turret index position P.sub.T at the completion of machining performed by the tool (see the white arrows), thereby ending the turning cycle for one process. Thereafter, the tool for the next process is selected and the same operations are repeated, whereby a desired part profile PFG (see the dashed line) is eventually obtained. In FIG. 10, CHK denotes a chuck. The cutting starting/end point P.sub.A is a point located at a distance .DELTA.d from a starting point P.sub.S on the part profile PFG.
With regard to the approach path among the tool paths traversed in such a turning operation, there is a case (i) where a direct approach is made by rapid-traverse positioning using the machining starting point (turret index point) P.sub.T and the cutting starting point P.sub.A as the respective starting and end points (see a first approach path PTA.sub.1), and a case (ii) where a suitable transit point (e.g., a point P.sub.AA or P.sub.AS) is entered and this point is traversed (see second and third paths PTA.sub.2, PTA.sub.3). The same is true for the withdrawal path. It should be noted that the cutting path is automatically decided by entering the part profile.
When the direct approach or withdrawal of case (i) is made, the approach and withdrawal distances can be shortened but a problem which arises is that the tool may be obstructed by obstacles such as a stationary portion of the machine, the workpiece, etc.
When approach or withdrawal is made so as to traverse the designated transit point as in case (ii), it can be arranged so that the tool will not interfere with the workpiece, but the transit point for the approach or withdrawal must be designated each time the approach or withdrawal is performed. This is a troublesome operation.


SUMMARY OF THE INVENTION

Accordingly, an object of the present invention is to provide a method of creating NC data for turning, wherein an approach path and withdrawal path which will not cause interference with an obstacle can be decided without entering a transit point.
In a method of creating NC data for turning according to the present invention, various approach/withdrawal patterns are registered in dependence upon a particular zone in which a turret index point is present, the zone being one among zones defined by horizontal and vertical axes passing through a point specified by a safe position coordinate in a longitudinal direction of a workpiece and a safe position coordinate in a direction perpendicular to the longitudinal direction, and in dependence upon a plane to which the cutting starting/end point belongs, the plane being one of a plane in the longitudinal direction of the workpiece and a plane perpendicular to the longitudinal direction. A predetermined pattern is selected from among the registered approach/withdrawal patterns based on the zone to which the turret index point actually belongs and the plane to which the cutting starting/end point actually belongs. NC data for approach and NC data for withdrawal are created using the selected pattern .


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a view for describing the principle of the NC data creation method of the present invention;
FIG. 2 is a block diagram of a system for executing the method of the invention;
FIGS. 3(a) through 8(c) are views of approach/withdrawal pat

REFERENCES:
patent: 4587608 (1986-05-01), Kishi et al.

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