Method of manufacturing shot

Details Method of manufacturing shot Method of manufacturing shot

F - Mech Eng,Light,Heat,Weapons

42

B

F42B 33/00 (2006.01) B22D 17/22 (2006.01) B22D 21/02 (2006.01) B22D 25/02 (2006.01) B22D 31/00 (2006.01) F42B 7/04 (2006.01)

Patent

CA 2212815

There is disclosed a method of manufacturing non-toxic shot pellets made from metal alloys such as bismuth for use in shotgun shells. 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 allow 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.

L'invention porte sur un procédé de fabrication de plombs de chasse non toxiques faits d'alliages, notamment à base de bismuth, et destinés à remplir les cartouches de chasse. Un alliage métallique en fusion, par exemple de bismuth et d'étain, est injecté dans un moule de manière à former un ensemble rectangulaire dense et régulier de plombs. Le rapport entre les baguettes de coulée et les plombs est réduit, et la production de plombs par coulée est accrue puisque les plombs des colonnes et rangées voisines sont mis en contact par de petits canaux d'interconnexion. Lesdits canaux permettent au métal de se répartir entre les plombs et de passer d'un plomb à l'autre. Le métal en fusion peut ainsi contourner les obstacles qui limitent le nombre de plombs par coulée. L'écoulement du métal dans le moule se trouve par ailleurs amélioré si on rabote la surface du moule d'une faible quantité de manière à former une feuille mince d'alliage entre les plombs.

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