Method for improving fluidity of cast magnesium alloy in casting mould

Abstract

The invention discloses a method for improving the fluidity of a cast magnesium alloy in a casting mould. The method specifically comprises the following steps of spraying an alkyl sodium sulfonate aqueous solution on the surface of the casting mould or a mud core first; coating and brushing sodium silicate after the casting mould or the mud core is dried; and then, igniting an organic matter withhigh carbon content; aligning a flame of the organic matter with a casting mould surface to perform roasting, so that carbon particles produced by incomplete combustion of the organic matter are uniformly adhered to the surface of a mould core in contact with a molten metal; and therefore, the roughness of the casting mould surface is reduced, and the fluidity of the molten metal in the casting mould is improved. According to the method disclosed by the invention, the fluidity of the cast magnesium alloy in the casting mould can be improved, so that the capacity of the cast magnesium alloy for forming a complex thin-walled casting is enhanced; meanwhile, the fluidity of the molten metal is enhanced; and under the same casting conditions, the alloy casting temperature is reduced, so that the defects of loosening and the like are reduced.

Description

technical field [0001] The invention relates to a casting method of an alloy casting, in particular to a method for improving the fluidity of an alloy in a mold. Background technique [0002] In aerospace, automobile and other fields, on the premise of satisfying the performance of products, reducing weight can increase the load of the system and save more energy. Magnesium alloys are more and more widely used due to their advantages such as low density, high specific strength, and excellent processing performance. The continuous development of the industry requires all kinds of magnesium alloy castings with excellent performance and complex structure to meet various needs. [0003] In the casting process, the molten alloy must first fill the mold and then solidify to form a casting. If the molten metal cannot fill the mold, it will cause defects such as cold shut and insufficient pouring, and the casting will be scrapped. During the filling process, on the one hand, the m...

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the invention is: in the process of forming complex magnesium alloy castings, it is difficult to fill the mold with alloy liquid in thin-walled parts, and there are quality hidden dangers in conventional coatings, and discloses a method for improving the fluidity of cast magnesium alloys in molds , to achieve the purpose of improving the fluidity of the molten metal in the mold

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