Environment-friendly freezing-dissolving casting process

Abstract

The invention provides an environment-friendly freezing and dissolving casting process and belongs to the technical field of casting. The process comprises the steps that a mold is fabricated by using molding sand and water, the mold is frozen to obtain a frozen mold, molten metal liquid is injected into the frozen mold, molten metal is solidified into a shell in the mold, cooling water is sprayed to the wall thickness portion of the mold, the frozen mold is made to be locally and quickly dissolved and collapsed, the cooling water makes direct contact with the variable wall thickness portion of a casting for cooling, and the molten metal is completely cured to form a target casting to recycle the molding sand, a coolant and other raw materials. By means of the environment-friendly freezing and dissolving casting process, the cooling speed of the casting can be increased, the cooling speed rate of the variable wall thickness portion of the casting is balanced, and the mechanical performance of the variable wall thickness complex casting is greatly improved; and meanwhile, the sand falling cleaning link is omitted along with final freezing mold dissolution and collapse sand falling, furthermore, casting wastes are few, and the environment-friendly freezing and dissolving casting process is a novel environment-friendly casting technology and has a great development prospect.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to an environment-friendly freezing-melting casting process. Background technique [0002] In the traditional casting method, the molten metal is poured into a mold suitable for the shape of the part. The molten metal loses heat naturally to the mold and solidifies. After cooling and solidifying, the part or blank is obtained. [0003] Due to the slow overall cooling rate of complex castings with variable wall thickness and the inconsistent solidification and shrinkage of parts with variable wall thickness, the molten metal tends to solidify first in the thin-walled parts, while the thick-walled parts cannot be supplemented by molten metal to form scattered and small holes. It is easy to produce casting defects such as hot cracks, which will reduce the mechanical properties of castings and seriously affect the quality of castings. In order to obtain ideal properties, many researche...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of low overall cooling rate of complex castings with variable wall thickness structures in the above-mentioned prior art, and defects such as hot cracks in local variable wall thickness parts due to inconsistent solidification shrinkage, resulting in low quality castings and many casting wastes , large environmental pollution and other issues, and provide an environmentally friendly freeze-melt casting process

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