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DIE CASTING

There are many types of die casting, whose process can be divided into casting, mold, high precision die casting.

What is die casting? Die casting is a precision casting method that uses a high pressure to force a metal solution into a complex metal mold. Die casting is abbreviated as die casting, which is a casting method in which a molten alloy liquid is poured into a pressure chamber, a cavity of a steel mold is filled at a high speed, and the alloy liquid is solidified under pressure to form a casting.

Casting dimensional accuracy is high, generally equivalent to 6~7, even up to 4;Good surface finish, generally equivalent to 5~8;

High strength and hardness, generally higher than sand casting by 25~30%, but extended the rate is reduced by about 70%;The size is stable and the interchangeability is good;The thin-walled complex casting can be die-cast. For example, the current zinc alloy die castings have a minimum wall thickness of 0.3 mm; custom aluminum alloy die casting up to 0.5 mm; the minimum cast hole diameter is 0.7 mm, and the minimum pitch is 0.75 mm.

Defination of high pressure aluminum casting
High pressure aluminum casting is a process of pressing molten metal into a sealed mold cavity under pressure. It is held in place by a strong compression force until the metal solidifies. After solidification, the mold is released, opened, and the metal is released. After disassembly, the mold cavity is re-sealed for the next cycle. The stage of exerting extremely high pressure on the molten metal true injection plunger is called strengthening.

Systems in high pressure aluminum die casting services
This process uses two different systems:

Hot chamber system. The injection system of the hot chamber machine is immersed in the molten metal of the blast furnace. When the piston is pumped, it forces the metal along the nozzle into the mold.

Cold room system. Generally speaking, small parts are made in hot chamber systems, while large parts are made in cold chamber systems because the size of hot chamber machines is limited. Compared with the hot chamber system, the pressure of the cold chamber system is higher.

Advantages of high pressure aluminum casting
Higher production speed.

Significantly reduced processing operations.

The welding agent has good surface finish.

Reducing the total weight of the welding agent can reduce the thickness of the plate wall.
The die-casting mold should be preheated before production, and a certain temperature should be maintained during the die-casting process. The die-casting mold is always in a hot state, which provides a basic guarantee for the filling and solidification of the alloy liquid. The zinc alloy is generally 150~200 °C; the preheating of the die casting mold can avoid the rapid cooling of the molten metal and reduce the fatigue stress of the die casting mold.

If you want to know more about aluminium pressure die casting process, please contact us.

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