Aluminum alloy die-casting products include the following: automobiles, engineering construction, electricity, electronics, computers, household appliances, high-fidelity speakers, military ships, aviation, aerospace and other military industries. Die casting is a precision casting method that uses high pressure to force molten metal into a metal mold with complex shapes. The molten alloy is pressed into the precision casting mold at high temperature, and the casting method that produces high precision and excellent casting surface in a short time is called aluminum alloy die casting.

Characteristics of aluminum alloy die casting

• The surface finish of the product is good, generally reaching Ra6.3 or even Ra1.6.

• No heat treatment.

• The product has high air tightness, high casting strength and surface hardness, but low elongation. Too thick wall thickness is easy to generate pores.

• The mold cost is high and the service life is short.

• High production efficiency.

• Thin-walled parts can be produced with small machining allowance.

• Special aluminum alloy cannot be used.

Disadvantages of aluminum alloy die casting

• The hardness is low, and the wear resistance is also relatively poor; the volume shrinkage during solidification is relatively large, about 6.6%.

• The linear expansion coefficient is relatively high; it is easy to stick to the mold, and it is necessary to strictly control the iron content in the range of 0.8%-0.9%.

• The melting point is low, and the use of high temperatures is limited.

The benefits of aluminum alloy die casting

• The thermal conductivity, electrical conductivity and cutting performance of aluminum alloy are good; the shrinkage is small, so it has good filling performance.

• Aluminum alloy has low density and high strength. The ratio of tensile strength to density is 9 to 15. It can maintain good mechanical properties at high or low temperature.

• Aluminum alloy has good corrosion resistance and oxidation resistance. Most aluminum alloys have good corrosion resistance in fresh water, seawater, concentrated nitric acid, nitric acid, gasoline and various organic substances.

• Save energy and reduce pollution.

What defects will appear in the aluminum alloy die casting process?

Irregular pores appear

It is caused by poor refining and degassing. The casting temperature of molten aluminum is generally around 600 degrees. At this temperature, the hydrogen content of the liquid is about 20 times that of the solid hydrogen, so in the process of condensation of the aluminum industry, there will be A large amount of gas is produced and needs to be released, so a large number of irregular pores will appear.

Aluminum alloy die-casting will also have shrinkage pores. Aluminum alloy shrinks during solidification. The higher the casting temperature, the greater the shrinkage. The pores caused by volume shrinkage exist in the final solidification part of the alloy, in an irregular shape, and in severe cases. mesh.

Conclusion

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