A kind of green lost foam casting method

Abstract

The invention discloses a green lost foam casting method. The foam plastic is made into a lost model, combined and bonded with a pouring riser to make a lost model cluster, and the outer surface of the lost model cluster is brushed with refractory paint and dried. , make the refractory coating layer form the formwork, add defoaming liquid into the formwork through the pouring riser, make the disappearing model defoam and shrink into a mixed solution, take out the mixed solution and recycle it, and carry out the mold shell with the pouring riser Vibration molding, the molten metal is poured into the mold shell through the sprue riser, and the casting is formed after solidification and cooling. The invention avoids the problem of environmental pollution caused by the gasification and disappearance of the lost model in the traditional lost foam casting process, uses the defoaming liquid to defoam and shrink the lost model, and recycles it, so as not to discharge polluting gas, and recycles the defoaming liquid and Vanishing model; green energy saving and environmental protection, no carbon formation on the surface of the casting; no large amount of gas generated during the casting process, no pores in the casting, which significantly improves the quality of the casting.

Description

technical field [0001] The invention relates to a method for lost foam casting, which belongs to a green and environment-friendly method. Background technique [0002] Lost foam casting (also known as solid mold casting) is to make foam plastic into a foam model with the same size and shape as the casting and combine it into a module, then brush refractory paint and dry it, and then embed it in dry quartz sand for three-dimensional vibration modeling. , pouring molten metal under negative pressure to vaporize the module, the liquid metal occupies the position of the module, and forms a new casting method after solidification and cooling. [0003] Compared with traditional casting technology, lost foam casting technology has obvious advantages and is called "casting technology in the 21st century" and "green revolution of foundry industry". In the process of lost foam casting, high-temperature molten metal is used to vaporize and disappear the foam, but there are three major...

AI Technical Summary

Problems solved by technology

In the process of lost foam solid mold casting, high-temperature molten metal is completely used to vaporize and disappear foam plastics, but there are three major problems in the cast castings: 1) A large amount of carbon formation on the surface of the casting causes its shallow black inclusions; 2) Lost foam gas Gasification produces a large amount of gas, causing casting defects, such as pores; 3) Lost foam gasification produces a large amount of polluting gas, causing environmental pollution

Although the above method is simple and feasible, it is difficult to take out the lost foam after shrinkage by heating and shrinking, and heating may cause the change of lost foam

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