Metal founding – Means to shape metallic material – Pressure shaping means
Patent
1979-03-22
1980-12-23
Baldwin, Robert D.
Metal founding
Means to shape metallic material
Pressure shaping means
164340, 164345, 164347, 425577, B22D 1724
Patent
active
042404983
ABSTRACT:
The specification discloses a die casting machine of the type adapted to form an article with an internal threaded portion. The threaded portion is formed by means of a threading device which is retractable. The threading device is rotatably and retractably operated by a pinion which in turn is rotated by a cog wheel. The die casting machine may contain a plurality of molding cavities, each being provided with the threading device. The cog wheels may be driven by a common rack which is hydraulically operated. Since the threading device of this invention is retractable, it is feasible to repeat a casting cycle without replacing the mold. Thus, it is much faster to fabricate such articles with the present machine than conventional die casting threading apparatus. Because no part is replaced or removed from the die casting machine in the present invention, it is possible to minimize possible dimensional variation among the articles fabricated. The specification also discloses a method for forming die casting including internal threaded portions by using the die casting machine according to the present invention.
REFERENCES:
patent: 2363808 (1944-11-01), Sayre
patent: 2579952 (1951-12-01), Morin
patent: 2984862 (1961-05-01), Chabotte
patent: 3152365 (1964-10-01), Fisher
patent: 3165796 (1965-01-01), McDonald
patent: 3905416 (1975-09-01), Hammer
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