Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Forming plural articles
Patent
1973-08-21
1976-06-01
White, Robert F.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Forming plural articles
264328, 264334, 425249, B29C 2500
Patent
active
039610136
ABSTRACT:
A core unit is moved into position within the mold halves of an injection mold and a casting is molded therein. The outer wall zones of the casting are cooled sufficiently to enable the casting to maintain its shape. At the beginning of the shrinking of the casting and while the inner wall zones of the casting are still in the plastic state but before any stresses are set up in the casting the divided mold is opened. The core and the casting thereon are removed from the mold to a cooling station where the casting is rapidly cooled and the core is then removed from the cooled casting. A corrugation can be formed in a tubular casting by positioning a ferromagnetic insert member upon the core and establishing a magnetic field to maintain the insert member in position during the casting process. The core can be provided with permanent magnets or electromagnets to hold the insert member in position.
REFERENCES:
patent: 3429007 (1969-02-01), Aoki
patent: 3557290 (1971-01-01), Siegfreid et al.
patent: 3576929 (1971-04-01), Turner et al.
patent: 3607569 (1971-09-01), Greenwell
patent: 3711590 (1973-01-01), Deutsch
patent: 3728065 (1973-04-01), Figwer
patent: 3737512 (1973-06-01), Stalter
patent: 3758253 (1973-09-01), Pearne
Gutlhuber Johann
Klenk Peter
Muhlner Karl
Balhoff T. E.
Jaskiewicz Edmund M.
Kunststoffwerk Gerbruder Anger GmbH & Co.
White Robert F.
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