What is hot chamber die casting and cold chamber die casting, why are there two types of die casting?
What is hot chamber die casting and cold chamber die casting, why are there two types of die casting?
Hot Chamber Die Casting:
It is suitable for the manufacture of zinc alloy, magnesium alloy and other alloys with low melting point.
Hot-chamber die-casting, sometimes called gooseneck die-casting, involves a pool of semi-liquid metal in a high-temperature molten state that fills the mold under the pressure of the die-casting die.
In hot chamber die casting, the cover has a gate.
Cold Chamber Die Casting:
Cold-chamber die-casting can be used when die-casting metals that cannot be used in the hot-chamber die-casting process.
This type of process requires the metal to be melted down in a separate boiler.
A quantity of molten metal is then transferred to an unheated injection chamber or nozzle.
These metals are injected into the mold by hydraulic or mechanical pressure.
The biggest disadvantage of this process is the long cycle time due to the need to transfer the molten metal into the cold chamber.
In cold chamber die casting, it is the injection port.
Die casting mold
It consists of two parts (male and female molds), and the part where the molded part is combined is called a fractal line.
The most important material properties for molds are thermal shock resistance and softness. Other characteristics include hardenability, machinability, thermal crack resistance, weldability, and usability.
Die-casting molds are usually made of hard tool steel. Metals that are die-cast at higher temperatures need to use harder alloy steel, so the cost of the mold is high.