What are the properties of aluminum die casting in the production process?
Pressure die-casting referred to, is a molten alloy was poured into a pressure chamber filled with high-speed steel mold cavity, and the formation of liquid alloy castings under pressure solidification method. Die-casting method different from the other main feature is the high-pressure and high-speed.
(1) liquid metal under pressure to fill the cavity and solidification at a higher pressure, a common pressure 15-100MPa.
(2) the liquid metal filling the cavity at a high speed, typically 10-50 m / s, and some may also be more than 80 m / sec (introduced through the inner cavity of the gate line speed - ingate speed), and therefore the metal liquid filling time is very short, about 0.01 to 0.2 seconds (subject to different sizes of castings) to fill the cavity inside. Die casting machine, die-casting alloy die-casting molds are the three factors of production, it is indispensable.
The so-called die-casting process is these three elements to be organically integrated use, and enable a stable rhythm and efficiently produce the appearance, the inherent good quality, size, pattern or agreement in line with the requirements of qualified casting, even quality castings. Die Casting liquidity, liquidity refers to the ability of the alloy liquid filling the mold. Liquidity determines the size of the casting alloy whether complex castings. Liquidity eutectic aluminum alloy best.
Many factors affect the liquidity, mainly components, the presence of metal oxides, metal compounds and other pollutants as well as the temperature of the solid particles in the liquid alloy, but the fundamental factors external pouring temperature and pouring pressure (commonly known as the pouring ram) level. Actual production, in the case of alloys have been identified, in addition to strengthening the melting process (refining and slag), but also the need to improve the process of casting (sand mold permeability, metal mold exhaust and temperature), and without prejudice under the premise of improving the quality of castings pouring temperature to ensure liquidity aluminum alloy.
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