The main functions of the injection head in the die casting machine are as follows:

1. Inject molten metal: The injection head extracts the pre-melted metal alloy from the furnace or melting furnace by controlling the hydraulic system and injects it into the mold cavity. This ensures that the metal is fully filled in the mold and that the shape and details of the mold are replicated.

2. Control pressure and speed: The injection head can adjust the pressure and speed of metal injection. By precisely controlling these parameters, the required part performance, surface quality and accuracy can be achieved.

3. Filling the mold: The injection head ensures that the molten metal fully fills the entire mold cavity by exerting a certain pressure during the metal injection process. This helps avoid defects such as blowholes, cold shut, short charging, etc.

4. Cooling control: Once the metal injection is completed, the injection head may be involved in controlling the cooling process of the metal in the mold. This helps ensure that the part maintains consistent structure and performance during solidification.

5. Protect the mold: The injection head usually has a design that prevents the metal flow from directly contacting the mold to reduce wear and extend the service life of the mold.