The Relationship Between Aluminum Alloy Casting Process And Ingot Quality

- Sep 27, 2017 -

Casting process parameters mainly include casting temperature, casting speed and cooling intensity, followed by liquid level height, casting start and end conditions, etc.

1. Casting temperature
The casting degree is usually the temperature required by the liquid metal to be injected into the crystallizer through the transfer tool. However, at present, most of the aluminum alloy smelting has been applied to the on-line degassing and filtration device, and the casting temperature is still not comprehensive and correct according to the above concepts. It is proved that the liquid temperature in the on-line degassing device has different effect of degassing. Therefore, it is important to consider the requirement of the air degassing device for the liquid temperature. In addition, you should consider the gas evolution of liquid in the crystallizer, due to the low casting temperature, liquid gas escape too late to rise in the crystallizer liquid level, cause porosity, loose, also may produce quality of ingot casting defects such as slag disasters and cold-lap, casting the highest temperature should not be more than the melting temperature. Too high casting temperature will cause the casting to start. Feathers at the bottom of the crack and ripping, also may produce tissue defects, and because different conversion tool length and liquid temperature drop, the first by hot line, the liquid temperature change ups and downs in the process of conversion, so scientific and standardized casting temperature should be refers to the fluid temperature in the injection mould in general high casting temperature than alloy crystallization temperature 50 ℃ ~ 70 ℃, 1, 3, XXX XXX series aluminum alloy in the casting machine in the transition band is narrower, casting temperature should be on the high side; The transition zone of 2xxx and 7xxx is wide. The casting temperature should be low.

2. Casting speed
In continuous casting, the length of unit time ingot is called casting speed. The old casting is usually a cast time as a fixed casting speed; And modern foundry casting speed is curve, namely casting with casting process is not the same casting speed: casting speed of fast and slow of ingot crack, surface quality, microstructure and mechanical properties of casting ingot has a great influence, on the premise of guarantee the quality of ingot casting, the highest casting speed should be adopted. In order to solve the crack problems of some alloys and specifications, the method of paving or tempering is adopted in the casting. In modern casting algorithm USES the ingot casting speed curves, replaced the old casting foundation or tempering process, it reduced the ancillary facilities, and saves manpower and reduce labor intensity, can also avoid - some of the choice of casting surface quality defects of casting speed is based on the production and the characteristics of the alloy ingot cross section size. It is necessary to improve the casting speed of alloy and ingot specifications with high temperature of cold crack. However, the alloy and ingot specifications of the hot crack tend to be lower in casting speed

3. Cooling strength
Cooling intensity is also known as cooling speed. The cooling intensity not only influences the crack of the ingot, but also has more influence on the structure of the ingot, as the cooling intensity increases, the crystallization speed of the ingot is increased, and the grain inner structure is more detailed. As the cooling intensity increases, the ingots are shallow. The bridge is shrunk in size. The metal shrinkage condition is improved, and the defects such as loose and porosity are eliminated or eliminated. Increase of ingot density: the size of a compound can be refined and the degree of regional segregation can be reduced.

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