Coated sand shell mould and steel-coated sand solidification casting process

Abstract

The invention belongs to the field of casting and particularly relates to a coated sand shell mould and steel-coated sand solidification casting process. The casting process includes molding material preparation, molding, core making, metal smelting, pouring, solidification control and other technologies. The invention aims to make innovation on the aspects of molding and solidification control so that a casting can be superior to a casting tissue produced regularly. The casting process is characterized in that two types of materials are adopted for a molding process for compound molding, the two types of materials comprise surface sand and floor sand, and the surface sand and the floor sand are of different heat conductivity coefficients. Coated sand is selected as the surface sand, the consumption of the coated sand is reduced, and casting surface quality is improved; steel sand is adopted for the floor sand, the used sand regeneration cost is lowered, more importantly, the steel sand is served as conformal indirect cold iron, the casting modulus is lowered, and casting defects are reduced; and the two molding materials of different heat conductivity coefficients are matched, and the cooling speed is controlled to obtain the uniform casting tissue. The process is high in production flexibility, good in applicability and low in cost.

Description

technical field [0001] The invention belongs to the field of casting, and in particular relates to a casting process for solidifying steel sand-coated sand shell molds. Background technique [0002] Casting technology is the technology and method of producing castings by applying casting related theory and systematic knowledge. Including molding material preparation, molding, core making, metal melting, pouring and solidification control, etc. The performance of a casting depends on its internal structure. The structure of a casting is determined by the casting process. Obtaining a predetermined structure through the control of the solidification process of the casting is a key link in the production of the casting. For castings with a certain chemical composition and structural shape, the cooling capacity of the mold is a key factor for solidification control to obtain a predetermined structure. Different mold materials have different thermal conductivity, resulting in di...

AI Technical Summary

Problems solved by technology

However, the sand-covered iron mold has poor air permeability, can only be molded for one mold, has a large investment, occupies a large area, has a long rebate cycle, and is expensive. It is not suitable for products with small batches, many varieties, and quick remodeling. The scope of application is narrow.

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