A plunger tip for die casting is configured to slide in a cylindrical sleeve to inject a molten metal in the cylindrical sleeve into a mold and includes a crushing portion and recesses. The crushing portion is provided on an outer peripheral surface on a front end side of the plunger tip and is capable of contacting a solidified layer of the molten metal generated on an inner peripheral surface of the cylindrical sleeve to crush the solidified layer. The recesses are provided on both sides of the crushing portion in a circumferential direction and recessed radially inward from the crushing portion. The crushing portion has a triangular shape and is a region between two of the recesses adjacent to each other in the circumferential direction and in which a front end side of the plunger tip is an apex.

A forming device includes a feeding component, an injection module, and a die-casting module. The feeding component has an internal space suitable for allowing a molten metal fluid to flow. The injection module is disposed on the feeding component and communicated with the internal space. The die-casting module has a mold cavity and a flow channel. The flow channel is aligned with the mold cavity and communicated with the internal space of the feeding component. The molten metal fluid flows to the die-casting module along the internal space, the injection module outputs a supercritical fluid into the internal space to mix with the molten metal fluid, and the feeding component pushes the molten metal fluid to pass through the flow channel and enter the mold cavity.

Provided are a dual injection system and a synchronization control method thereof. The system includes a primary injection system and a secondary injection system, where the primary injection system and the secondary injection system each include a speed injection oil circuit and a booster oil circuit; the speed injection oil circuit of the primary injection system and the speed injection oil circuit of the secondary injection system are arranged independently of each other; and the booster oil circuit of the primary injection system and the booster oil circuit of the secondary injection system each include an A-bridge valve group and are arranged in coordination with each other. The method is configured to perform a synchronization control on the primary injection system and the secondary injection system of the system.

An integrated system of a melting device and a liquid injection mechanism and an injection method thereof, including: a machine platform, an injection device, a melting cylinder, a mold device and a driving device; wherein the melting cylinder is installed above the injection device, the lower part of the front end of the melting cylinder is connected to the input end of the injection device, and there is an upright holding furnace above the rear end; where an alloy melting furnace melts materials into alloy molten liquid, which flows through an input pipe into the holding furnace and into the melting cylinder. Through a heater, the alloy molten liquid is kept warm and flows into the injection device, where it is extruded from the front end of the injection device by the driving device, entering the mold device for cooling and molding to complete the alloy injection molding.

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.