Variable volume die casting shot sleeve
AssigneeNelson Metal Products Corporation
InventorDennis S. Shimmell
Life of this patent
Estimating the term…
Abstract
A variable volume metal delivery system for a die casting machine. The system includes a shot sleeve having a plunger propelled by a shot cylinder. A stroke adjustment rod operated by a second cylinder extends into the shot cylinder to define the backward stroke limit of the shot cylinder and consequently that of the plunger. The stroke adjustment rod is movable by means of the second cylinder between a high-volume position, permitting a relatively long stroke, and a low-volume position, providing a relatively short stroke. Accordingly, the volume of the shot sleeve can be changed easily, for example, to accommodate the manufacture of articles either with or without structural inserts.
Claims11
A variable volume metal delivery system for use in a die casting apparatus, comprising:
- a shot sleeve defining an internal shot volume;
- a plunger reciprocable within said shot sleeve between a retracted position wherein molten metal may be introduced into said shot sleeve and an extended position wherein metal is expelled from said shot sleeve, said plunger having an extended stroke limit and a retracted stroke limit;
- gross volume control means for changing the retracted stroke limit of said plunger between a low-volume position and a high-volume position without varying the extended stroke limit of said plunger;
- and
- fine volume control means for providing fine adjustment of the retracted stroke limit of said plunger in both of the low-volume and high-volume position without varying the extended stroke limit of said plunger.
A variable volume metal delivery system for a die casting apparatus comprising:
- a shot sleeve having a discharge end and a plunger reciprocable within said sleeve between a retracted position wherein said plunger is away from said discharge end and an extended position wherein said plunger is toward said discharge end, said plunger having a retracted stroke limit and an extended stroke limit, said shot sleeve defining a shot volume between said discharge end and said plunger when in the retracted position;
- a shot cylinder having a reciprocable rod extending therefrom and connected to said plunger to provide motive force to said plunger in moving between the retracted position and the extended position;
- gross volume control means for changing the retracted stroke limit of said shot cylinder rod and connected plunger between a low-volume retracted stroke position and a high-volume retracted stroke position without varying the extended stroke limit of said plunger, thereby providing gross variation in the shot volume of said shot sleeve;
- and
- fine volume control means for providing fine adjustment of the retracted stroke limit of said shot cylinder rod and connected plunger in the low-volume position and the high-volume position without varying the extended stroke limit of said plunger, thereby providing fine variation in the shot volume of said shot sleeve.
An improved metal delivery system for a die casting apparatus, said system including a die assembly, a shot sleeve connected to said die assembly, a plunger reciprocable within said shot sleeve, and a shot cylinder for extending and retracting said plunger, and limit means for limiting the stroke of said plunger wherein the improvement comprises said limit means comprising:
- a volume control cylinder connected to said shot cylinder;
- a stroke adjustment rod extending from said volume control cylinder and operably engaging said shot cylinder to limit the stroke of said shot cylinder;
- and
- means for actuating said volume control cylinder to move said stroke adjustment rod between a low-volume position defining a first stroke of said shot cylinder and a high-volume position defining a second stroke of said shot cylinder.
Dependencies are inferred from the claim text.