Do you really understand what is die casting?

Aluminum die casting is a process injected hot,liquid metal into steel molds. These molds are known as dies. Aluminum is a desirable alloy to use for die casting because it creates lightweight, corrosion-resistant materials that can operate in very high temperatures. These die castings are used to produce electrical castings,pump casting parts,auto parts casting,valve casting,etc.

Die Casting Tooling

Dies are made of two sections:The fixed die half, also known as the cover half, and the ejector die half which is movable in order for the castings to be taken out.The sides of the die fold together and close like a book and are securely kept together by locking pins.Ejector pins are used to help remove the casted part.Located on the inner side of the two folding sections are negative reliefs of the metal part that is going to be made.On the cover half there are open holes called sprue holes and this is where the molted metal is poured into the die until it fills all of the nooks and crannies of the cavity on the inside of the mold.The ejector half contains passageways called runners and inlets called gates.These depressions in the die route the molten metal and force it to move into the hollow cavity of the mold.There are also openings in the dies for coolant and lubricants to be added.Lubricants are necessary as they allow the cooled product to be easily removed.

Die Casting Machinery

These machines hold the two die halves together under intense hydraulic pressure.The place where the two fixed halves meet the ejector is called the die parting line.The projected surface area of the part that is being cast is measured at this line, and that number is used to determine how much hydraulic pressure is needed to inject the metal into the die cavity.There are two kinds of die casting machines: hot chamber and cold chamber. Hot chamber machines are used when the dies are made out of lead, magnesium, copper or zinc.These metals and other low melting-point alloys are used to made metal pots and other things that can chemically interact with other metals and be corroded easily.Cold chamber machines are used for aluminum dies and have a metal sleeve into which molten metal is poured.This can be done manually or by a computer-automated system.A hydraulic plunger pushes into the sleeve and forces the metal into the aluminum die at a very high pressure to ensure that the cavity is filled.

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