A backflow prevention device of a light metal injection device and a backflow prevention method thereof of the disclosure include: a valve which has a valve body made of a corrosion-resistant and heat-resistant steel and a valve seat made of a ceramic, and in which the valve body advances and is seated on the valve seat to close a communication path communicating a melting unit and an injection unit, and the valve body retracts and is separated from the valve seat to open the communication path; a valve body drive device which moves a drive body to which the valve body is connected forward and backward; a position sensor which detects that the drive body has reached at least a predetermined advance limit position; and a valve body drive control device which controls the valve body drive device based on a signal of the position sensor.

A backflow prevention device of a light metal injection device and a backflow prevention method thereof of the disclosure include: a valve which has a valve body made of a corrosion-resistant and heat-resistant steel and a valve seat made of a ceramic, and in which the valve body advances and is seated on the valve seat to close a communication path communicating a melting unit and an injection unit, and the valve body retracts and is separated from the valve seat to open the communication path; a valve body drive device which moves a drive body to which the valve body is connected forward and backward; a position sensor which detects that the drive body has reached at least a predetermined advance limit position; and a valve body drive control device which controls the valve body drive device based on a signal of the position sensor.

In a molten metal pump, which includes a pump chamber portion and a drive unit and drives molten metal in a pump chamber of the pump chamber portion by the drive unit for discharging and sucking, the pump chamber portion has an outer cylinder and an inner cylinder detachably housed in the outer cylinder, the outer cylinder is configured as a bottomed cylindrical body having an outer cylinder bottom wall and an outer cylinder side wall, the inner cylinder is configured as a bottomed cylindrical body having an inner cylinder bottom wall and an inner cylinder side wall, a ring-shaped spacer, which is interposed between an inner surface of the outer cylinder bottom wall and an outer surface of the inner cylinder bottom wall in a sealed state and in a detachable manner, is further provided.

In a molten metal pump, which includes a pump chamber portion and a drive unit and drives molten metal in a pump chamber of the pump chamber portion by the drive unit for discharging and sucking, the pump chamber portion has an outer cylinder and an inner cylinder detachably housed in the outer cylinder, the outer cylinder is configured as a bottomed cylindrical body having an outer cylinder bottom wall and an outer cylinder side wall, the inner cylinder is configured as a bottomed cylindrical body having an inner cylinder bottom wall and an inner cylinder side wall, a ring-shaped spacer, which is interposed between an inner surface of the outer cylinder bottom wall and an outer surface of the inner cylinder bottom wall in a sealed state and in a detachable manner, is further provided.

A process of forming an erosion, oxidation, and wear resistant shot chamber, either a gooseneck or a shot sleeve, is provided. The process utilizes a self-healing erosive wear resistant coating on a liner of refractory metal to serve as the working surfaces of a shot chamber. Such a shot chamber is expected to have an improved service life for die casting of corrosive metals and alloys, including hot chamber die casting of aluminum alloys. An improved hot dipping process using stirring in the motel metal bath is also disclosed.

A module for a die-casting device that includes a base that can be fastened to a mounting plate of the die-casting device, a screw/cylinder unit for producing a thixotropic material, and a filling chamber, wherein the screw/cylinder unit and the filling chamber are arranged indirectly or directly on the base such that thixotropic material produced by the screw/cylinder unit can be conveyed into the filling chamber.

The present invention is directed to a molten metal pump comprising an elongated pumping chamber tube with a base end and an open top end. A shaft extends into the tube and rotates an impeller therein, the impeller rotates proximate the base end. The tube has a diameter at least 1.1 times the diameter of the impeller. The pumping chamber tube preferably has a length at least three times the height of the impeller. The base end includes an inlet and the top end includes a tangential outlet. Rotation of the impeller draws molten metal into the pumping chamber and creates a rotating equilibrium vortex that rises up the walls of the pumping chamber. The rotating vortex adjacent the top end exists the device cia the tangential outlet.

The present invention is directed to a molten metal pump comprising an elongated pumping chamber tube with a base end and an open top end. A shaft extends into the tube and rotates an impeller therein, the impeller rotates proximate the base end. The tube has a diameter at least 1.1 times the diameter of the impeller. The pumping chamber tube preferably has a length at least three times the height of the impeller. The base end includes an inlet and the top end includes a tangential outlet. Rotation of the impeller draws molten metal into the pumping chamber and creates a rotating equilibrium vortex that rises up the walls of the pumping chamber. The rotating vortex adjacent the top end exists the device cia the tangential outlet.

A casting device for operating stably while suppressing leakage from a gap between a tip and a sleeve is disclosed. The casting device includes: a sliding member in the center of which a rod slides, and in which a gap is formed between the rod and the sleeve; a seal member arranged at an outer periphery of the sliding member; and a suction device for suctioning air inside the sleeve. When the seal member is positioned in a center section closer to a cavity than a pouring hole, and the air in a space between the sliding member and the tip is suctioned, the seal member assumes a first state in which the seal member adheres to the center section, and in the first state, the tip advances toward the cavity.

A die casting method includes a step of supplying molten metal to a plunger sleeve, and a step of advancing a plunger in the plunger sleeve, to inject the molten metal into dies. In the step of injecting the molten metal into the dies, the plunger is once retracted before being advanced, and the plunger is kept accelerated until the plunger reaches a target maximum speed when the plunger retracted is advanced.