Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1977-03-09
1978-03-21
Combs, E. M.
Metal founding
Process
Shaping liquid metal against a forming surface
164113, 164131, 164347, 249 59, 425441, B29D 100, B22D 2710
Patent
active
040794750
ABSTRACT:
A process for casting or molding a single internal thread at the same time that the desired product is cast or molded. The desired thread configuration is defined by two aligned and abutting identical core pins. Each of the pins has a protruding portion in the shape of a helical ramp extending through an angle of less than 360.degree.. The ramp has an outer diameter and pitch corresponding to the diameter and pitch of the desired internally threaded surface to be formed. The protruding portion of each core pin includes a vertically oriented surface extending between the ends of the ramp. A peripheral edge groove extending along the outer edge of the ramp defines the desired thread configuration. The aligned core pins are placed within a recess formed by mating portions of a die block to define the shape of the desired product. A hardenable fluid is introduced into the spaces between the die blocks and the core pins, and hardened to produce the desired product, after which the die blocks and core pins are separated to permit removal of the product therefrom.
REFERENCES:
patent: 2133019 (1938-10-01), Campbell
patent: 3150222 (1964-09-01), Blaustein et al.
patent: 3926401 (1975-12-01), Northup
Coats & Clark Inc.
Combs E. M.
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