What Are The Classifications And Advantages Of Cast Aluminum Alloys

What are the classifications and advantages of cast aluminum alloys
Cast aluminum alloy is an aluminum alloy that can directly obtain parts through metal casting process. The alloy element content of this type of aluminum alloy casting is generally higher than that of the corresponding forged aluminum alloy.
1、 Classification of cast aluminum alloys.
There are four types of cast aluminum alloys based on the main alloying elements.
1. Aluminum silicon alloy, also known as "silicon aluminum" or "silicon aluminum". It has good casting and wear resistance, low coefficient of thermal expansion, and is the largest variety of cast aluminum alloys, with the largest silicon content of 4%~13%. Sometimes 0.2% to 0.6% magnesium silicon aluminum alloy is added and widely used in structural components such as shells, cylinders, boxes, frames, etc. Sometimes adding an appropriate amount of copper and magnesium can improve the mechanical properties and heat resistance of the alloy. This alloy is widely used in the manufacturing of pistons and other parts.
2. Aluminum copper alloy, with an alloy containing 4.5% to 5.3% copper, has the best strengthening effect. Moderate addition of manganese and titanium can significantly improve the strength and castability at room and high temperatures. Mainly used for manufacturing sand castings with large static and dynamic loads and simple shapes.
3. Al Mg alloy, a cast aluminum alloy with the lowest density (2.55g/cm3) and the highest strength (about 355mpa), contains 12% magnesium and has the best strengthening effect. This alloy has good corrosion resistance in the atmosphere and seawater, and has good comprehensive mechanical and machining properties at room temperature. It can be used for parts such as radar bases, aircraft engine casings, propellers, landing gears, and can also be used as decorative materials.
4. Aluminum zinc alloy, often added with silicon and magnesium to improve its performance, is often referred to as "zinc silicon aluminum". Under casting conditions, the alloy has a quenching effect, known as "self quenching". It can be used without heat treatment, and after modification and heat treatment, the casting has high strength. Stable in size after stabilization, commonly used for making models, templates, and equipment supports.
2、 The advantages of casting aluminum alloys.
1. Good product quality: High dimensional accuracy of castings, usually equivalent to 6-7 or even 4 pieces; Good surface finish, generally equivalent to 5-8 grades; Generally, the strength is 25-30% higher than that of sand casting, but the elongation is reduced by about 70%. Stable size and good interchangeability; For example, the minimum wall thickness of zinc alloy die-casting aluminum parts can currently reach 0.3mm; Aluminum alloy castings can reach 0.5mm; The minimum casting aperture is 0.7 millimeters; The minimum spacing is 0.75 millimeters.
2. High production efficiency: High machine productivity. For example, domestic horizontal cold air die-casting machines can cast aluminum 600-700 times on average in 8 hours, while small hot chamber die-casting machines can cast aluminum 3000-7000 times on average in 8 hours. Die cast aluminum molds have a long service life. A pair of die-casting aluminum molds and die-casting aluminum watch alloys can be used hundreds of thousands or even millions of times. Mechanization and automation are easy to achieve.
3. Excellent economic benefits of casting aluminum alloys: due to the precise size and smooth surface of pressed aluminum parts. Generally, it is not used for processing but directly used, or the processing volume is small, which not only improves the utilization rate of metal, but also reduces a large number of processing equipment and working hours; Cheap castings