Compression molding system, apparatus and method

Details Compression molding system, apparatus and method Compression molding system, apparatus and method

1998-12-22

2001-03-06

Pyon, Harold (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

With apparatus assembly or dismantling means or with idle part

For press shaping surface

C425S450100, C029S466000

Reexamination Certificate

active

06196825

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention is concerned with compression molding of sheet molding composites that form shaped body parts of vehicles, for example.
In standard construction of molds for compression molding of sheet molding composites, a cast or forged steel mold incorporates shaped mold surfaces and a heating system as well as guide pins, heel plates, and stop pads. Each part to be molded requires a dedicated mold incorporating all of the foregoing components, so the manufacture of such molds is highly specialized and expensive.
BRIEF DESCRIPTION OF THE INVENTION
The present invention provides compression molding system, apparatus and method that are simpler and less costly and that has the additional advantage of interchangeability of molds. In the invention, mold part holders incorporate components for performing, in a unique manner, functions previously performed by guide pins, heel plates, and stop pads of standard molds. New, interchangeable mold parts, lacking those functions, are removably attached to the holders. Each of the mold parts preferably comprises a sheet metal core or cavity component supported by a steel box structure that includes heating elements for heating the sheet metal component. The invention makes use of the discovery that, in low pressure compression molding, elaborate arrangements of a multiplicity of heel blocks spaced in two dimensions to stabilize high pressure molds are unnecessary, and that stabilization along with guidance and stop functions can be performed by simple corner assemblies of the mold part holders.


REFERENCES:
patent: 4750876 (1988-06-01), Lawson
patent: 4861254 (1989-08-01), Takeuchi et al.
patent: 5096404 (1992-03-01), Janos et al.
patent: 5332384 (1994-07-01), Abramat
patent: 5744173 (1998-04-01), Sterett

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