Method of creating NC data for complex curved surfaces

Details Method of creating NC data for complex curved surfaces Method of creating NC data for complex curved surfaces

1987-12-03

1989-07-25

Atkinson, Charles E.

Boots, shoes, and leggings

36447429, 36447433, 318567, 3185681, G06F 1532, G06F 1546

Patent

active

048519863

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

This invention relates to a method of creating NC data for a complex curved surface and, more particularly, to a complex curved surface NC data creation method in which a cutting path pattern is specified for every curved surface constituting a complex curved surface, and cutting is performed by moving a tool along the cutting path conforming to the specified cutting path pattern.
There are cases where it is required to machine a complex curved surface composed of a combination of two or more three-dimensional curved surfaces. FIG. 7 shows a side view (FIG. 7(A)) and a plan view (FIG. 7(B)) of a complex curved surface composed of a combination of two three-dimensional curved surfaces (hereinafter refered to simply as "curved surfaces") 1 and 2. The curved surface 1 has a frusto-conical shape, the curved surface 2 has the shape of a semicircular cylinder. There is also a boundary line 3. To machine this complex curved surface, the conventional practice is to designate one cutting path pattern on the entire complex curved surface, obtain points discretely on the actual cutting path based on the cutting path pattern, create NC data in such a manner that a tool will traverse the points continuously, and machine the complex curved surface on the basis of these NC data.
For instance, in the example of FIG. 7, the cutting path pattern is a group of straight lines which grow incrementally larger every a.sup.o in radial fashion from a center P.sub.c (FIG. 7(B)). Each straight line is a line segment from a point P.sub.i (i=1, 2, . . .) of radius r to a cutting boundary point Q.sub.i. The NC ddata for machining this complex curved surface are generated as follows:
When NC data are thus created upon designating only one cutting path pattern for the complex curved surface and the complex curved surface is machined in accordance with the NC data created, an unnatural striped pattern is produced on the surface of the generated complex curved surface and the curved surface cannot be finished off attractively. It should be noted that if the stripes formed on the curved surface 2 are all parallel in the direction of the cylinder or all parallel in the circumferential direction, the surface will be finished off attractively. However, this will not be the case because only one cutting pattern (a radial pattern in the example of FIG. 7) is designated, and as a result, the surface will not exhibit an attractive finish.


SUMMARY OF THE INVENTION

Accordingly, an object of the invention is to provide a complex curved surface NC data creation method for moving a tool along a cutting path pattern which conforms to the shape of each curved surface constituting a complex curved surface, whereby the machined surface can be finished off attractively.
The present invention relates to a method of creating NC data for a complex curved surface comprising a combination of at least two three-dimensional curved surfaces. The NC data creation method includes inputting data specifying each of the curved surfaces and data for specifying a cutting path pattern for each curved surface, obtaining points discretely from a cutting starting point of one curved surface to a boundary point with another of the curved surfaces along a cutting path pattern set on the one curved surface, obtaining points discretely on the other of the curved surfaces along a cutting path pattern specified with respect to the other of the curved surfaces, thereafter performing a pick-feed and obtaining points discretely along the cutting path pattern on each of the curved surfaces in similar fashion, and creating NC data for generating a complex curved surface by successively traversing each of the points.


BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1(A) and 1(B) are a side view and a plan view, respectively, of a complex curved surface, for describing the general features of the present invention;
FIG. 2 is a block diagram of an apparatus for practicing the present invention;
FIG. 3 is a flowchart of processing in accordance with the present inv

REFERENCES:
patent: 4491906 (1985-01-01), Kishi et al.
patent: 4523270 (1985-06-01), Kishi et al.
patent: 4535408 (1985-08-01), Kishi et al.
patent: 4546427 (1985-10-01), Kishi et al.
patent: 4589062 (1986-05-01), Kishi et al.
patent: 4692873 (1987-09-01), Kishi et al.

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