What are the advantages of aluminum alloy casting process performance?

Aluminum alloy casting is an aluminum alloy that can obtain parts through metal casting molding process. The content of alloying elements in aluminum alloy castings is also more than that of deformed aluminum alloy. In recent years, many people will choose to use aluminum alloy castings for casting. It has many technical attributes and advantages, and has been loved and favored by many consumers. So, what is the technological performance of aluminum alloy casting? What are the advantages of aluminum alloy?

1. What are the technological characteristics of aluminum alloy casting?

(1) liquidity

Fluidity refers to the ability of alloy liquid to fill the mold. Fluidity determines whether the alloy can cast complex castings. Among aluminum alloys, * * * crystal alloy has the best fluidity.

There are many factors that affect the fluidity of aluminum alloy casting process, mainly the composition, temperature and solid particles of pollutants such as metal oxides and metal compounds in alloy liquid, but the external fundamental factors are pouring temperature and pouring pressure (commonly known as pouring head).

(2) contraction

Shrinkage is one of the main characteristics of aluminum alloy castings. Generally speaking, from liquid casting to solidification cooling to room temperature, alloys can be divided into three stages, namely, liquid shrinkage, solidification shrinkage and solid shrinkage. The shrinkage of alloy has a decisive influence on the quality of castings, which affects the shrinkage cavity size, stress generation, crack formation and size change of castings. Usually, the shrinkage of castings is divided into volume shrinkage and linear shrinkage, and the linear shrinkage is generally used to measure the shrinkage of alloys in actual production.

(3) thermal cracking

Hot cracks in aluminum castings are mainly caused by the shrinkage stress of castings exceeding the bonding force between metal grains, and most of them occur along grain boundaries. It can be seen from the observation of crack fracture that the metal at the crack is often oxidized and loses its metallic luster. The cracks extend along the grain boundary in zigzag shape, with wide surface and narrow inside, and some of them run through the whole casting end face.

(4) Air tightness

The air tightness of cast aluminum alloy refers to the degree of non-leakage of hollow aluminum castings under the action of high-pressure gas or liquid, and the air tightness actually represents the compactness and purity of the internal structure of the castings.

What are the advantages of aluminum alloy casting?

1, the quality of aluminum alloy products is very good, and the dimensional accuracy of castings is high, which is generally equivalent to 6~7 grades, or even up to 4 grades; Good surface finish, generally equivalent to 5~8 grades; The strength and hardness are higher, the strength is generally 25~30% higher than that of sand casting, but the elongation is reduced by about 70%; Stable size and good interchangeability; Die-casting aluminum thin-walled complex castings. For example, at present, the minimum wall thickness of zinc alloy pressure casting aluminum parts can reach 0.3mm, and the minimum casting aperture can reach 0.5mm, and the minimum spacing is 0.75 mm.

2. The production efficiency of aluminum alloy is also very high, and the machine productivity is high. For example, domestic J Ⅲ 3 horizontal cold air die casting aluminum machine can die cast aluminum for 600 ~ 700 times every eight hours on average, and small hot chamber die casting aluminum machine can die cast aluminum for 3000~7000 times every eight hours on average; Die-casting aluminum die has a long service life, and a pair of die-casting aluminum die and die-casting aluminum watch alloy can be used for hundreds of thousands or even millions of times; It is easy to realize mechanization and automation.

3. Due to the advantages of accurate size and smooth surface, the economic effect of aluminum alloy casting is excellent. Generally, it is used directly without mechanical processing, or the processing amount is very small, which not only improves the metal utilization rate, but also reduces a lot of processing equipment and working hours; The casting price is cheap; Combined die-casting aluminum can be used with other metal or nonmetal materials. Save assembly time and metal.

The above is the performance and advantages of aluminum alloy casting technology introduced by Bian Xiao. Aluminum alloy belongs to the hardware category. If you have this demand, you can refer to it and hope to help you.