Complex curved surface creation method

Details Complex curved surface creation method Complex curved surface creation method

1986-10-23

1989-04-25

MacDonald, Allen

Boots, shoes, and leggings

318570, G05B 19403

Patent

active

048253774

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
This invention relates to a method of generating a complex curved surface and, more particularly, to a method of generating a complex curved surface by combining at least two three-dimensional curved surfaces.
2. Description of the Related Art
A curved surface of a three-dimensional metal mold or the like on a design drawing is generally expressed by a plurality of section curves, but no profile data is shown for the shape of the area lying between a certain section curve and the next adjacent section curve. In numerically controlled machining it is essential that machining be carried out so as to smoothly connect these two section curves despite the fact that the profile between them is not given. In other words, this means that machining must be performed by generating the curved surface between the two section curves from such data as that indicative of the section curves, recording on an NC tape the data concerning the generated curved surface, and carrying out machining in accordance with commands from the NC tape. To this end, there has been developed and put into practical use a method comprising generating a plurality of intermediate sections in accordance with predetermined rules from several sections of a three-dimensional curved body and from data specifying section curves, finding a section curve (intermediate section curve) on the curved body based o the intermediate sections, and generating a curved surface of the three-dimensional body based on the plurality of generated intermediate section curves. For example, see the specification of Japanese Patent Application Laid-Open No. 57-5109 (corresponding to U.S. Pat. No. 4,491,906), and "Introduction to NC Programming", published by Nikkan Kogyo Shimbunsha, Oct. 30, 1981, pp. 156-162. This method is useful in generating a smooth curved surface from section data.
Depending upon machining, there are cases where it is necessary to machine a complex curved surface obtained by combining two or more three-dimensional curved surfaces, or in other words, to create a complex curved surface. However, it is not possible with the prior art to create a complex curved surface in a simple manner by combining these three-dimensional curved surfaces using the data indicative of each three-dimensional curved surface.


SUMMARY OF THE INVENTION

Accordingly, an object of the present invention is to provide a novel method of creating a complex curved surface through which a complex curved surface composed of curved surfaces can be created using the curved surface data of each curved surface.
The present invention provides a complex curved surface creation method for creating a complex curved surface composed of at least two three-dimensional curved surfaces. The complex curve surface creation method comprises (1) a first step of inputting data for specifying each of the three-dimensional curved surfaces and inputting data specifying one line of intersection on a predetermined plane as well as a rule for specifying a number of lines of intersection on the predetermined plane on the basis of said line of intersection, (2) a second step of finding a section curve of the complex surface based on a section which has an i-th line of intersection, among the number of lines of intersection, as its line of intersection with the predetermined plane, and (3) a third step of specifying a complex curved surface by assembling the section curves based on sections corresponding to respective ones of the lines of intersection.
Thus, data for specifying each of the three-dimensional curved surfaces constituting the complex curved surface are inputted, as well as data specifying one line of intersection on a predetermined plane (e.g. the X-Y plane) as well as a rule for specifying a number of lines of intersection on the X-Y plane on the basis of the line of intersection. It should be noted that the data specifying the three-dimensional curved surfaces are e.g. operating curve data and base curve data. Further, the lines of inter

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