Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Positioning of a mold part to form a cavity or controlling...
Patent
1992-09-30
1995-03-07
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Positioning of a mold part to form a cavity or controlling...
264 401, 264320, B29C 4358
Patent
active
053955650
ABSTRACT:
A method of deciding the quality of a SMC workpiece (34) in compression-molding the SMC workpiece (34) on a compression-molding press which compression-molds the SMC workpiece (34) in a cavity (13) formed between a pair of molds (11, 12) by moving at least one of the pair of molds by hydraulic cylinder actuators (4, 7) includes detecting the hydraulic pressure P.sub.O of the working fluid supplied to the hydraulic cylinder actuators (4, 7) upon the arrival of the moving mold (11) at a predetermined position; comparing the detected hydraulic pressure P.sub.O with a predetermined optimum hydraulic pressure P.sub.N to determine the deviation .DELTA.P.sub.O =P.sub.N -P.sub.O ; deciding the quality of the SMC workpiece (34) on the basis of the deviation .DELTA.P.sub.O, and interrupting the compression-molding /peration to avoid producing defective moldings when it is decided that the quality of the SMC workpiece is nonconforming or executing an automatic control operation to add a predetermined pressure correction .DELTA.P corresponding to the deviation .DELTA.P.sub.O to the detected hydraulic pressure P.sub.O.
REFERENCES:
patent: 4911629 (1990-03-01), Fujita
patent: 5017315 (1991-05-01), Kumazaki
Kashiwa Masahiko
Nagaoka Tsutomu
Kabushiki Kaisha Kobe Seiko Sho
Vargot Mathieu D.
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