Lost pattern casting method

Abstract

Provided is an evaporative pattern casting process wherein a casting process plan capable of attaining the optimal discharge of generated gas can easily be decided. The present invention is an evaporative pattern casting process for casting a product, which comprises pouring a molten metal in a mold in which a pattern made of an expanded synthetic resin is embedded in molding sand, and evaporating the pattern with the molten metal, while gas generated by evaporation of the pattern is discharged outside the mold through a discharging passage comprising a discharged gas suppressing means, wherein the ventilation of the discharging passage is controlled on the basis of the material and the shape of the pattern and the kind of the molten metal and the temperature of the molten metal.

Description

technical field [0001] The present invention relates to a lost foam casting method, in particular to a lost foam casting method in which casting is performed while releasing gas generated by the disappearance of a mold to the outside of a sand mold through a discharge passage. Background technique [0002] The lost foam casting method, also known as the foam plastic casting method, is a process in which a model made of synthetic resin foam is embedded in molding sand and directly used as a sand mold. This process thermally decomposes the synthetic resin foam through the injected melt, but produces a large amount of pyrolysis gas containing carbon black (soot), produces peculiar smell, etc., and deteriorates the environment. flawed shortcomings. [0003] The lost foam casting method has many advantages such as easy casting. On the contrary, there are casting defects caused by poor adjustment of exhaust, low model strength, and the sand cannot be strongly filled because the m...

AI Technical Summary

Problems solved by technology

This process thermally decomposes the synthetic resin foam through the injected melt, but produces a large amount of pyrolysis gas containing carbon black (soot), produces peculiar smell, etc., and deteriorates the environment. Defects

[0003] The lost foam casting method has many advantages such as easy casting. On the contrary, there are casting defects caused by poor adjustment of exhaust, low model strength, and the sand cannot be strongly filled because the model is easily damaged, and the sand mold strength is insufficient due to insufficient filling density. Or sticky sand and other defects

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