Waterglass-process precise casting process

Abstract

The invention relates to precise casting processes and independently designs a waterglass-process precise casting process with carbon dioxide hardening and high temperature sand strip in order to solve the problem that defects are prone to occur in chemical method hardening sand-strip processes and low-mould waterglass-process casting. The process includes wax preparation, wax mould making, wax mould checking, wax mould group tree, coating preparation, shell making, hot air dewaxing, shell calcination, shell checking, liquid steel pouring, cleaning cutting and castings examination. By means of the waterglass-process precise casting process, device corrosion, environment pollution and worker personal safety potential hazards which are present in traditional chemical method hardening sand strip processes can be solved, meanwhile, qualities of castings surfaces and interior formation can be greatly improved, the finished product rate of castings is increased, the workload of post-treatment is lowered, working environment of a shell making workshop can be improved, production cost is lowered, and large part production capacity of traditional waterglass shells is greatly increased.

Description

technical field [0001] The invention relates to a precision casting process, in particular to a water glass precision casting process. Background technique [0002] The water glass casting process occupies a dominant position in my country's steel casting industry, and it has superior characteristics in terms of cost, efficiency, and operation than other casting methods. The traditional water glass casting process adopts aluminum chloride hexahydrate hardening and ammonium chloride solution dewaxing process, because aluminum chloride hexahydrate is easy to produce nitrite with water glass during the shell hardening process, which will corrode the equipment workshop, During the firing process, harmful gases will be produced, which will affect the air environment. Residual nitrite will affect the surface finish of castings, and waste water cannot be discharged. At the same time, the ammonium chloride solution is weakly acidic, and the acidity increases when heated. Corrosive ...

AI Technical Summary

Problems solved by technology

[0003] At present, there is an environmentally friendly process that adopts carbon dioxide hardening and high-temperature dewaxing in the market, but it is suitable for the casting of water glass sand with a modulus of 3.0. When it is used for the production of castings weighing more than 20 kilograms per piece, the surface quality is difficult to guarantee, and the surface has burrs. , sticky sand, surface toad skin, orange peel and defects caused by delamination are unavoidable

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