The old precision casting method USES the fractional crystallizer, especially when casting flat ingots. The water jacket and the crystallizer are separate. With the development of casting technology, the crystallizer of modern precision casting method is one. Use old mold casting cooling water consumption is large, when because the old mould water supply is not closed, open fire and not part of the cooling water cooling, and a cooling and cooling of the secondary cooling intensity difference, inevitably produce some casting defects; And when the modern crystallizer is cast. Cooling water consumption is small. It has been proved that it is only about 70 percent of the amount of water used in the old mold. Currently abroad with low liquid level casting crystallizer, its purpose is to improve the cooling intensityof aluminum carbide, reduce or eliminate a cooling after the heating phenomenon of the air gap area, so almost no secondary cooling quenching condition, flat ingot casting ordinary have mould height fell to 100, of course, this requires the operator has a high operating level or add white liquid level control system.

The cooling water temperature requirement is not negligible. Normally, the cooling water temperature is set at 20, but due to regional climatic conditions. The conditions of water supply facilities and the temperature of plant are different, so the quality defects of ingots are found in regional or seasonal ingots. Modern mold water supply system with pulse or cross disguised form function, are determined by the process of programming, so the cooling intensity can be set according to the casting technique for the curve, especially for some bad cold plastic and aluminum carbide, precision casting when cold crack and thermal cracking is almost at the same time, additional water retaining plate system, make the ingot surface temperature to the plastic tensile deformation temperature, eliminate cold cracks ingot casting, craft to take measures to prevent the hot crack, which can obtain high quality ingot.

Cooling intensity is also known as cooling speed. The cooling strength not only influences the crack of precision casting, but also influences the structure of the ingot, and increases the crystallization speed of the ingot as the cooling intensity increases. 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.

Posted by: hannahgwendolyn at 09:59 AM | No Comments | Add Comment
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