Plastic and nonmetallic article shaping or treating: processes – Vacuum treatment of work – To degas or prevent gas entrapment
Patent
1982-09-13
1983-11-22
Derrington, James H.
Plastic and nonmetallic article shaping or treating: processes
Vacuum treatment of work
To degas or prevent gas entrapment
264101, 264311, B29C 504
Patent
active
044168411
ABSTRACT:
A method for centrifugally casting thermosetting plastics and the like, this method including the following steps of assembling and closing a casting mold having an upper portion and a lower portion; placing a prepared dividing hub onto and over a plurality of drive pins provided on a spinner carried by a stationary base, said dividing hub having a reservoir engaging a plurality of prepared closed casting molds onto and over a like number of nozzles, each of said nozzles extending radially from the sides of said dividing hub; placing and tightening a clamping means around the perimeter of the casting molds; pouring a pre-measured quantity of the thermosetting plastic into said reservoir in the dividing hub; moving a vacuum hood to the stationary base and with gasket means forming a vacuum chamber with said stationary base; evacuating the now closed vacuum chamber; forming and providing a conduit connecting an extreme tip of each of said nozzles with a bottom portion of the reservoir and then spinning the casting molds wherein the thermosetting plastic material flows from the reservoir through the connecting conduit and then into the casting molds; stopping the spinning casting molds; venting the vacuum chamber; moving the vacuum hood to an open condition; releasing and opening the clamping means; curing the thermosetting plastic within the casting molds at a station remote from the apparatus; disassembling the casting molds, and removing the cast items from the molds after curing.
REFERENCES:
patent: 3016573 (1962-01-01), Blue
patent: 3601857 (1971-08-01), Hampel
patent: 3850902 (1974-11-01), Metcalfe
patent: 4002418 (1977-01-01), Wallace
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patent: 4063863 (1977-12-01), Hilmoe
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patent: 4294792 (1981-10-01), Arons et al.
patent: 4362685 (1982-12-01), Simioni
Corea Emanuel R.
Corea John E.
Tashlick Irving
Derrington James H.
Pinto Patrick J.
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