Counter-piston central injection die casting
AssigneeTesla, Inc.
InventorChanghua Huang
Life of this patent
Estimating the term…
Abstract
A die casting system can employ a counter piston to make central injection of large parts or multiple cavity parts possible. The die casting system can include a shot piston disposed on an injection side and a counter piston disposed on an ejector side. The counter piston can move between a sealing position to seal a liquid in the shot sleeve during pouring and slow injection phases, and an opening position to allow the liquid into the casting cavity during cavity injection phase.
Claims20
A die casting machine having an ejector side and an injection side, comprising:
- a counter piston disposed on the ejector side;
- a shot piston disposed on the injection side;
- and
- a shot sleeve configured to receive the shot piston and a liquid.
A die casting process employing a counter piston, the process comprising:
- moving the counter piston to at least partially contact a shot sleeve so as to prevent a liquid from flowing from through the shot sleeve to a casting cavity;
- sliding a shot piston inside the shot sleeve so as to remove air from inside the shot sleeve;
- and
- moving the counter piston away from the shot sleeve so as to allow the liquid to enter the casting cavity.
A die casting machine configured to control a flow of molten metal into a casting cavity during a third phase, comprising:
- a housing;
- a shot sleeve slidingly disposed in the housing and forming a receptacle, the receptacle being configured to receive the molten metal and a gas during a first phase;
- a shot piston configured to slide in the shot sleeve so as to remove the gas from the receptacle during a second phase leaving the molten metal;
- and
- a counter piston slidingly disposed in the housing so as to prevent the molten metal from entering the casting cavity during the first and second phases while allowing the molten metal to enter the casting cavity during the third phase.
Dependencies are inferred from the claim text.