Automatic machining using constructive solid geometry with Boole

Details Automatic machining using constructive solid geometry with Boole Automatic machining using constructive solid geometry with Boole

1984-09-28

1986-10-21

Smith, Jerry

Boots, shoes, and leggings

364168, 364170, 364474, 318568, G05B 900

Patent

active

046189246

ABSTRACT:
Constructive solid geometry is a technique of representing parts by adding and subtracting a set of primitive shapes. Automatic tool paths to machine a part with a rotating cutter are generated by taking the constructive solid geometric description of the part and replacing every primitive shape by an offset primitive, larger or smaller than the part by the cutter radius. A planar section slice of the offset part has the property that the center of the milling cutter will traverse this section curve and form the original part without gouging. To machine efficiently, a series of parallel slicing planes are taken from top to bottom through the offset part. For each section curve, numerical control machine code is generated to direct the cutter to follow that path, and the part is automatically machined. The method applies to both rough and finish cutting.

REFERENCES:
patent: 4152765 (1979-05-01), Weber
patent: 4513366 (1985-04-01), Munekata
patent: 4530046 (1985-07-01), Munekata
patent: 4533286 (1985-08-01), Kishi
Solid Modeling: A Historical Summary and Contemporary Assessment; IEEE Computer Graphics & Applications, Mar. 1982, Requicha et al, pp. 9-24.
Hinds, J. K. & Kuan, L. P., "Sculptered Surface Technology as a Unified Approach to Geometric Definition", Advanced Manufacturing Technology, ed. by P. Blake, North-Holland Publishing Co., 1980, pp. 19-40.
Farouki, R. T. & Hinds, J. K., "Truce-the Tridimensional Rational Unified Cubic Engine-User's Manual", General Electric Co., Corporate Research and Development, Schenectady, N.Y. (Chapters 1, 8, 12).
Lee, R. B. & Fredricks, D. A., "Intersection of Parametric Surfaces and a Plane", IEEE Computer Graphics and Applications, Aug. 1984, pp. 48-51.
Farouki, R. T. & Hinds, J. K., "A Hierarchy of Geometryc Forms", submitted to IEEE Computer Graphics and Applications, Aug. 1984.

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