Method of manufacturing bismuth shot

Details Method of manufacturing bismuth shot Method of manufacturing bismuth shot

1995-02-14

1996-05-07

Batten, Jr., J. Reed

Metal founding

Process

Shaping liquid metal against a forming surface

29 122, 295276, 164129, B22D 1704, B22D 1722, B22D 2502, B22D 3100

Patent

active

055136893

ABSTRACT:
A molten metal alloy, such as bismuth and tin, is injected into a die block to form a tightly packed rectangular array of shot pellets. The ratio of waste sprue to shot pellets is minimized and the shot pellet yield per casting is maximized by allowing the shot pellets in the rectangular shot array to touch other shot pellets in adjoining rows and columns through small interconnecting vias. The interconnecting vias allows the molten metal to flow between shot pellets, as well as from the sprue into the shot pellets. This allows the molten metal to bypass blockages that reduce the shot pellet count per casting. The flow of the molten metal through the die block is also improved by machining away a small amount of metal from the face of the die in order to form a flashing between the shot pellets.

REFERENCES:
patent: 1746236 (1930-02-01), Barton
patent: 2209502 (1940-07-01), Annich
patent: 4949644 (1990-08-01), Brown
patent: 5279787 (1994-01-01), Oltrogge

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