Programmable velocity and force control method for compression m

Details Programmable velocity and force control method for compression m Programmable velocity and force control method for compression m

1977-01-27

1978-02-28

Kucia, Richard R.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Positioning of a mold part to form a cavity or controlling...

264294, 264325, B29G 100

Patent

active

040767809

ABSTRACT:
A compression molding operation is controlled by applying a press force to a mold having a cavity charged with molding compound. The separation of the mold halves is measured at each corner thereof by linear variable differential transformers. Hydraulic cylinders operating on the press ram generally in the area of each corner of the molds are individually controlled to locally vary the press force on the molds to maintain mold parallelism as determined by the LVDT's to control the velocity of press closing also as measured by the LVDT's according to a preprogrammed velocity profile, and further to control the amount of press force applied to the molds according to a preprogrammed value during curing of the molding compound.

REFERENCES:
patent: 3401425 (1968-09-01), Fink
patent: 3531830 (1970-10-01), Gelin
patent: 3543344 (1970-12-01), Hunt
patent: 3667891 (1972-06-01), Gelin
patent: 3694541 (1972-09-01), Gelin
patent: 3802818 (1974-04-01), Watanabe
patent: 3809739 (1974-05-01), Gelin
patent: 3819774 (1974-06-01), Eggenberger

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