A kind of casting sand composition and casting method

Abstract

The invention discloses a casting sand composition and a casting method. The composition comprises 100% of the basic molding sand raw sand whose particle size is 30-70 mesh; 3.5%-4% of the addition of sand; the modified water glass is high-collapse water glass for casting; the addition of the organic ester curing agent for casting is 8%-10% of the addition of the modified water glass . The foundry sand composition and the casting method provided by the present application, the mold core made by using the foundry sand composition has high strength, good retreatability at high temperature, good collapsibility, non-toxic and tasteless. The high-manganese steel castings produced by it have little thermal cracking tendency, low gas generation, and the recovery of old sand can reach more than 80%. 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. , The quality of castings has been improved and the market competitiveness has been 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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