Also called "silicon aluminum Ming" or "silicon aluminum Ming". Have good casting performance and wear resistance, thermal expansion coefficient is small, in the casting of aluminum alloys in the most varieties, the largest amount of alloy, silicon content in 10% ~ 25%. Sometimes add 0.2% ~ 0.6% magnesium silicon aluminum alloy, widely used in structural parts, such as shells, cylinders, boxes and frames. Sometimes add appropriate amount of copper and magnesium, can improve the mechanical properties and heat resistance of the alloy. Such alloys are widely used in the manufacture of pistons and other components.
Baiyineng Aluminum, casting aluminum alloy advantages and disadvantages
(2) aluminum-copper alloy
Copper 4.5% to 5.3% alloy with the best reinforcing effect, the appropriate addition of manganese and titanium can significantly improve the room temperature, high temperature strength and casting performance. Mainly used in the production of sand castings to withstand large dynamic and static load and shape is not complex.
(3) aluminum-zinc alloy
In order to improve the performance of silicon, magnesium elements are often added, often referred to as "zinc-silicon aluminum Ming". In casting conditions, the alloy has a quenching effect, that is, "self-quenching". Can be used without heat treatment, after heat treatment with metamorphosis, castings have high strength. After stabilization treatment, the dimensions are stable, and it is often used to make models, type plates and equipment brackets.
(4)Aluminum-magnesium alloy
Minimum density (2.55g/cm3), the highest strength (355MPa or so) of the casting of aluminum alloys containing magnesium 12%, the best strengthening effect. Alloy in the atmosphere and seawater corrosion resistance is good, room temperature has a good comprehensive mechanical properties and machinability, can be used for radar base, the aircraft's engine box, propeller, landing gear and other parts, can also be used as decorative materials.
Advantages and disadvantages of cast aluminum alloy
Advantages of cast aluminum alloy:
1, good product quality:
Castings of high dimensional accuracy, generally equivalent to 6 ~ 7, and even up to 4; good surface finish, generally equivalent to 5 ~ 8; high strength and hardness, strength is generally higher than the sand casting of 25 ~ 30%, but elongation decreased by about 70%; dimensional stability, and the surface of the aluminum alloy, generally equivalent to 5 ~ 8; strength and hardness, strength than sand casting generally increased 25 ~ 30%, but elongation reduced by about 70%; Dimensional stability, good interchangeability; Die casting aluminum thin-walled complex castings. For example, the current zinc alloy die casting aluminum parts minimum wall thickness of up to 0.3mm; aluminum alloy castings up to 0.5mm; minimum casting aperture diameter of 0.7mm; minimum pitch of 0.75mm.
2, high production efficiency:
Machine productivity is high, for example, the domestic J Ⅲ3 horizontal cold air die casting aluminum machine average eight hours can die casting aluminum 600 ~ 700 times, small hot room Die casting aluminum machine average eight hours can die casting aluminum 3000 ~ 7000 times; Die casting aluminum type long life, a die casting aluminum type, die casting aluminum bell alloy, life up to hundreds of thousands of times, or even millions of times; Easily realize mechanization and automation.
3, excellent economic effect:
Because of the die-casting aluminum parts of precise size, table flooding clean and other advantages. Generally no longer mechanical processing and direct use, or processing is very small, so both improve the utilization of metal, but also reduces a large number of processing equipment and man-hours; casting price is cheap; can be used in combination with die-casting aluminum to other metal or non-metallic materials. Both save assembly labor hours and save metal.