Plastic article or earthenware shaping or treating: apparatus – Sets of convoluting or twisting means
Patent
1991-10-10
1993-11-30
Heitbrink, Jill L.
Plastic article or earthenware shaping or treating: apparatus
Sets of convoluting or twisting means
425384, 4253871, 425391, 425396, B29C 5300
Patent
active
052660214
ABSTRACT:
A method, process and apparatus for generating complex shapes without the use of dies, molds, or other fixed tooling. A continuous length or flow of a malleable or fluent material is provided to a forming apparatus which shapes the material, producing a contiguous series of smoothly blended, properly contoured portions of the desired shape. The formation of a shape relies on continuous control of shape-determining variables: the instantaneous cross-section of the shape in a virtual transition surface between the formable and formed material, the rate-of-change of cross-sectional dimensions between sequential cross-sections, the instantaneous angle of movement of the material at any point on the cross-section in the transition surface, and the rate of movement away from the transition surface of the just-stabilized portion of the shape. The material is stabilized as these shape-determining variables achieve the proper values in each portion of the material. The invention further provides a technique for analyzing and modifying a computer model of a desired shape, and for developing a process control datafile from the models.
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