Valve precision casting environment-friendly technology process

Abstract

The invention discloses a valve precision casting environment-friendly technology process. The valve precision casting environment-friendly technological process comprises the following steps of wax mould molding, shell making, dewaxing, roasting, melting and pouring, solidification, cleaning, shot blasting, welding repair and heat treatment. The valve precision casting environment-friendly technology is low in cost, low in rejection rate, simple in process and environmentally friendly. Wax blocks adopted by a casting model and wax materials recovered by the dewaxing are low in melting point,and a manufactured wax mould is low in cost, low in energy dissipation and energy-saving and environmental protection; liquid wax formed by the dewaxing can be recycled and used, waste water is not discharged, and energy conservation and environmental protection are achieved; a precision casting model is easy to be formed and dressed and with high precision and high yield; shells have high hardness, fire resistance and high impact resistance, the manufactured precision castings are non-clay; and during solidification and cooling, the castings do not produce shrinkage cavities and cracks.

Description

technical field [0001] The invention relates to the technical field of castings, in particular to an environmental protection process flow of precision casting of valves. Background technique [0002] With the continuous advancement of industrial structure upgrading, my country's demand for precision castings is also increasing, but it also puts forward more stringent requirements for the product size and surface finish of castings. [0003] For a long time, the main factors affecting the promotion and use of precision castings are the production cost and the demanding precision requirements of precision castings. In terms of production cost, due to the wide use of precision castings, the use of a single model is not large. To reduce the production cost of precision castings, the precision casting model should use reusable materials; at the same time, the precision casting model should use low melting point , Materials that are easy to shape and trim to improve the yield of...

AI Technical Summary

Problems solved by technology

[0004] At the same time, precision castings will emit a large amount of sulfur dioxide and nitrogen oxides during the production process, which seriously threatens the natural ecological environment of our country and cannot meet our country's environmental protection standards for the foundry industry.

[0005] The traditional precision casting process is complex, costly, low production efficiency, high scrap rate, and serious pollution

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