Boots – shoes – and leggings
Patent
1982-08-23
1985-06-11
Ruggiero, Joseph
Boots, shoes, and leggings
318568, 364171, 364474, G06F 1546, G05B 1942
Patent
active
045232709
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a method of creating the curved surface of a three-dimensional body and, more particularly, to a method of creating curved surfaces that is ideal for the preparation of a numerical control tape required for the numerically controlled machining of a three-dimensional metal mold or the like.
2. Background Art
A curved surface of a three-dimensional metal mold or the like, when drawn out on the plane of a blueprint, is generally represented by a plurality of given section curves, but no data is shown for the shape of the area lying between a certain section curve and the next adjacent section curve. When carrying out numerically controlled machining it is essential that these two section curves be connected smoothly despite the fact that the shape of the area 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, punching an NC tape so as to incorporate the data concerning the generated curved surface, and then machining the workpiece in accordance with the instructions on the NC tape. To this end, the numerical control tape ordinarily is prepared by using a computer, and either of two methods can be adopted to create the curved surface, namely (1) a patch system in which processing is executed by partitioning a curved surface into minute portions, and (2) a system in which a two-dimensional curve made of straight line segments and arcs is modified for each pick-feed applied to a third axis.
The patch system (1), however, entails the processing of large quantities of data as well as highly complicated mathematical processing, and requires a large-scale computer system. The system (2) makes processing with a small-scale computer possible, but there is no three-dimensional tool offset capability and an excessive limitation upon tool movement direction and machining shape, making it impossible to create sophisticated three-dimensional bodies.
Accordingly, the inventors have already proposed a method of creating curved surfaces, comprising generating a plurality a planar intermediate sections and finding a section curve in each intermediate section, in accordance with predetermined rules, from section data specifying given sections (sections lying on planes) of a three-dimensional body and from data specifying section curves in said sections, and generating the curved surface of the three dimensional body based on each of the section curves in the plurality of generated intermediate sections. In accordance with such method, processing can be carried out with a small-scale computer and a sophisticated three-dimensional body can be created in a simple manner.
Nevertheless, according to the aforementioned previously proposed method of creating curved surfaces, a disadvantage is that the curved surface of a three-dimensional body cannot be created in a case where the given data is section data specifying cylindrical sections and section curve data for curves in the cylindrical sections. More specifically, for machining a three-dimensional metal mold or the like, it is required to machine, say, a curved surface SS1 bounded by curves CV1 through CV4, as shown in FIG. 1. The curved surface SS1 is bounded, however, by the curves CV1, CV2 (namely cylindrical section curves) lying on the surfaces of respective first and second cylinders CYL1, CYL2, by planes PL1, PL2, and by the curves CV3, CV4 (namely planar section curves) in the respective planes PL1, PL2. In consequence, the curved surface SS1 cannot be created with the method of creating curved surfaces previously proposed.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a novel method of creating curved surfaces in which, in a case where cylindrical sections and the section curves lying in the cylindrical sections are given, the curved surface bounded by these section curves can be created in a simple manner, and in which processi
REFERENCES:
patent: 3857025 (1974-12-01), English et al.
patent: 4010356 (1977-03-01), Evans et al.
patent: 4152765 (1979-05-01), Weber
patent: 4163284 (1979-07-01), Kishi et al.
Clark-"Designing Surfaces in 3-D"-Communications of the ACM-Aug. 1976, vol. 19, No. 8.
Society of Automotive Engineers 449A, Automotive Engineering Congress, Detroit, Mich. (1962-1) (New York) J. B. Rankin, "Computers and Numerical Control", p. 4, FIG. 10.
Kishi Hajime, "NC Software" (1972-11) Kogyo Chosaki Kabushiki Kaisha, p. 191, line 11 to p. 197, line 27.
Kishi Hajimu
Seki Masaki
Fanuc Ltd
Ruggiero Joseph
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