What are the classification and advantages of cast aluminum alloy

Cast aluminum alloy is a kind of aluminum alloy whose parts can be obtained directly through the metal casting process. The content of alloying elements in this kind of aluminum alloy castings is generally higher than that in forged aluminum alloys.

casting aluminum alloy classification.

1. Aluminum-silicon alloy, also known as "silicon aluminum" or "silicon aluminum". It has good castability and wear resistance, low thermal expansion coefficient, casting aluminum alloy is the most variety, silicon content is the largest, 4% ~ 13%. Sometimes add 0.2% ~ 0.6% magnesium silicon aluminum alloy, widely used in structural parts, such as shell, cylinder, box, frame and so on. Sometimes adding appropriate amount of copper and magnesium can improve the mechanical properties and heat resistance of the alloy. The alloy is widely used to make pistons and other parts.

2. Aluminum copper alloy, the alloy containing copper 4.5% ~ 5.3% has the best strengthening effect. Appropriate addition of manganese and titanium can significantly improve the strength and castability at room temperature and high temperature. It is mainly used for making sand casting with large static and dynamic load and simple shape.

3. Al-mg alloy, the casting aluminum alloy with the lowest density (2.55g/cm3) and the highest strength (about 355mpa), containing 12% magnesium, has the best strengthening effect. The alloy has good corrosion resistance in air and sea water, and has good comprehensive mechanical properties and machining properties at room temperature. It can be used for radar base, aircraft engine casing, propeller, landing gear and other parts, as well as decorative materials.

4. Al-zinc alloys, often with silicon and magnesium added to improve their properties, are often referred to as "zinc-silica-aluminum". Under casting conditions, the alloy has a quenching effect, that is, "self-quenching". It can be used without heat treatment. After metamorphic heat treatment, the castings have high strength. Stable size, often used for making models, templates and equipment support.

the advantages of casting aluminum alloy.

1. Good product quality: casting size accuracy is high, generally equivalent to 6~7 or even 4; Good surface finish, generally equivalent to grade 5 ~ 8; The general strength is 25-30% higher than sand casting, but the elongation is reduced by about 70%. Stable size, good interchangeability; For example, the minimum wall thickness of zinc alloy die-cast aluminum parts can reach 0.3mm; Aluminum alloy castings up to 0.5mm; The minimum casting aperture is 0.7mm; The minimum spacing is 0.75 mm.

2. High production efficiency: High machine productivity. For example, domestic horizontal cold air die casting machine can die cast aluminum 600-700 times in 8 hours on average, and small hot chamber die casting machine can die cast aluminum 3000-7000 times in 8 hours on average. Die cast aluminum die has long life. A pair of die cast aluminum molds and die cast aluminum watch alloys can be used hundreds of thousands or even millions of times. Mechanization and automation are easy to achieve.

3. Excellent economic effect of casting aluminum alloy: due to the precise size and smooth surface of pressed aluminum parts. Generally not used for processing but direct use, or small amount of processing, both improve the utilization rate of metal, and reduce a lot of processing equipment and working hours; Cheap casting; Die cast aluminum can be used with other metal or nonmetal materials. Not only does it save the assembler's time, but it also saves the metal.