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Why do aluminum alloy casting

Release time:

2022-03-29

Aluminum alloy casting has good casting performance and can be made into parts with complex shapes; it does not require a lot of additional equipment; it has the advantages of saving metal, reducing costs, and reducing working hours, and is widely used in aviation, civil and other industries. Aluminum alloy casting is used to manufacture beams, gas turbine blades, pump bodies, towers, hubs, intake lips and engine casings. It is also used in the manufacture of automotive cylinder heads, gearboxes and pistons, instrument housings and turbocharger pump bodies.

Aluminum alloy casting is an aluminum alloy that fills molten metal in a mold to obtain parts of various shapes. It has the advantages of low density, high specific strength, good corrosion resistance and casting processability, and less restrictions on the design of parts structure. Aluminum alloy casting can be dividedAl-Si and Al-Si-Mg-Cu-based medium-strength alloys; aluminum-copper-based high-strength alloys; aluminum-magnesium-based corrosion-resistant alloys; Al-Re-based hot-strength alloys. Most of the heat treatment is needed to strengthen the alloy, eliminate the internal stress of the casting, and stabilize the organization and size of the parts. Aluminum alloy casting is generally used to manufacture beams, gas turbine blades, pump bodies, towers, hubs, intake lips and engine casings. It is also used in the manufacture of automotive cylinder heads, gearboxes and pistons, instrument housings and turbocharger pump bodies.

铝合金铸造

Aluminum alloy casting is mainly to remove gas and non-metallic inclusions in the alloy liquid. The gas in aluminum alloy is mainly hydrogen (More than 85%), inclusions are mainly alumina. Since the saturation solubility of hydrogen in liquid and solid aluminum alloys is nearly 20 times different, aluminum alloy casting is prone to hydrogen evolution during solidification, resulting in pinholes in castings. Interaction of inclusions with gases.

WhenWhen the hydrogen content in 100g of industrial pure aluminum is higher than 0.1ml, pores will appear. In high-purity aluminum, hydrogen is contained per 100g of aluminum alloy. When the volume of aluminum alloy casting is as high as 0.4 ml, pores will appear. It can be seen that degassing requires slag removal, which is the basis of degassing.

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