Long span sprue tube for investment casting

Details Long span sprue tube for investment casting Long span sprue tube for investment casting

1989-08-07

1991-04-02

Godici, Nicholas P.

Metal founding

Means to shape a forming surface

Pattern

164 34, 164 35, 249 54, 249 62, B22C 702, B22C 904

Patent

active

050040375

ABSTRACT:
The tube is at least two inches long and has successive sections of progressively smaller diameters to produce a correspondingly shaped sprue passage communicating with a pattern cavity in a casting investment, so that fluid casting material passes with increasingly fluid velocity between an inlet and outlet of the sprue passage during the casting process. A bulbous portion of the tube is spaced from its free end, to form a reservoir chamber in the sprue passage, spaced sufficiently from the pattern cavity, so that casting material flowing through the sprue passage attains maximum velocity at the outlet of the passage entering the pattern cavity.

REFERENCES:
patent: 3340923 (1967-09-01), Benfield
patent: 3610317 (1971-10-01), Benfield et al.
patent: 4081019 (1978-03-01), Kulig
patent: 4741378 (1988-05-01), Engelman et al.

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