Foundry sand composition and casting method

Abstract

The invention discloses a foundry sand composition and a casting method. According to the composition, the adding amount of crude sand of alkaline foundry sand with the granularity of 30-70 mesh is 100%; the adding amount of modified water glass accounts for 3.5%-4% that of the crude sand of the alkaline foundry sand; the modified sodium silicate is high-collapsibility water glass for casting; andthe adding amount of an organic ester curing agent for casting accounts for 8%-10% that of the modified water glass. According to the foundry sand composition and the casting method, a mold core manufactured through the foundry sand composition is high in strength, good in deformability at high temperature, good in collapsibility and free of toxins and odors. A high manganese steel casting produced through the foundry sand composition is small in hot cracking tendency and low in gas volume, and the recovery rate of used sand can reach 80% or above. The problem that only water blasting sand removal can be adopted for an ester-hardened high manganese steel casting, and a cold unpacking method sand shakeout cannot be carried out is effectively solved, and environmental pollution caused by used sand discharging is reduced; and surface microcracks generated by a water blasting sand removing process casting can be avoided, the quality of the casting is improved, and the market competitiveness is enhanced.

Description

technical field [0001] The invention relates to the technical field of shakeout of steel castings, in particular to a casting sand composition and a casting method capable of realizing cold-opening and dry shakeout. Background technique [0002] Casting is a kind of metal thermal processing technology mastered by human beings earlier, with a history of about 6,000 years. China has entered the heyday of bronze castings between 1700 BC and 1000 BC, and the craftsmanship has reached a very high level. Casting is a method in which liquid metal is poured into a casting cavity adapted to the shape of the part, and after it is cooled and solidified, the part or blank is obtained. The material to be cast is mostly a metal that was originally solid but heated to a liquid state (for example: copper, iron, aluminum, tin, lead, etc.), and the material of the mold can be sand, metal or even ceramics. Depending on the requirements, the methods used will vary. [0003] Ester-hardened so...

AI Technical Summary

Problems solved by technology

It effectively solves the problem that ester-hardened high manganese steel castings can only be sand blasted by water blasting but cannot be sanded out by cold open box dry method. It not only reduces the environmental pollution caused by the discharge of old sand, but also avoids the surface microcracks of castings caused by water blasting sand cleaning process. , can give full play to the advantages of explosive hardening; the most important thing is the success of cold unpacking, realizing the hammering riser process, improving the quality of castings and enhancing market competitiveness

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