Boots – shoes – and leggings
Patent
1988-11-18
1991-07-09
Gruber, Felix D.
Boots, shoes, and leggings
364578, 425145, G06F 1531, G05D 706
Patent
active
050311085
ABSTRACT:
A molten injection-molding method is applicable to any system of dividing a molded product form model into micro-elements and analyzing a molten material flow behavior within the mold by the use of numerical analytic techniques that include the finite element method, boundary element method, difference method, and FAN method, among others. First, the entire length of time required for the process of filling the mold with a molten material is divided into an arbitrary number of intervals, representing the filling progress in each individual time interval in an equitime curve diagram. This is followed by setting a point that corresponds to any element, drawing from the point a normal line to its corresponding equitime curve, next setting a point of intersection between said normal line and an adjacent equitime curve, drawing another normal line to this equitime curve, and then repeating the series of steps with still other adjacent equitime curves further on, to generate and display a filling flow curve diagram from the points set in correspondence with said equitime curves and normal lines that connect the points together.
REFERENCES:
patent: 4326255 (1982-04-01), Fujita
patent: 4787057 (1988-11-01), Hammond
patent: 4797842 (1989-01-01), Nackman et al.
Zienkiewicz: The Finite Element Method, 1977 McGraw-Hill (Textbook) pp. 93/118.
Shephard: Finite Element Modeling in their own Integrated Geometric Modeling Environment Part I: Mesh Generation pp. 61/71.
"Flow Analysis Network (FAN)-A Method for Solving Flow Problems in Polymer Processing", Polymer Engineering and Science, Sep. 1974, vol. 14, No. 9, by Z. Tadmor et al., pp. 660-665.
Fujita Shigeru
Harada Susumu
Gruber Felix D.
Toshiba Machine Co. Ltd.
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