Investment casting method

Abstract

The invention discloses an investment casting method. The investment casting method mainly comprises the following steps: configuring pattern materials; pressing the pattern materials: painting a compression surface with a layer of turpentine oil and pouring the mixed pattern materials obtained in the step A so as to press the pattern materials; drying a fired mold; combining the fired mold with a gating system so as to manufacture a shell; roasting the shell. According to the method provided by the invention, a prepared fired mold product is high in dimensional accuracy, small in number of casting flaws and reliable in product quality, castings obtained through pouring by utilizing the method are precious in sizes and high in surface quality, and the method is even suitable for casting fired molds and castings which are complicated in casting shapes, resistant to high temperature and not easy to process. According to the method provided by the invention, the production cycle is shortened, the production efficiency is improved, the production cost is reduced, and the method has the guiding significance on practical production.

Description

technical field [0001] The invention relates to the pouring field, in particular to an investment casting method. Background technique [0002] In the process of traditional investment casting method, shrinkage cavity and porosity defects of castings are more common, especially in light alloys such as aluminum and magnesium investment casting, defects such as porosity and shrinkage cavity are easy to occur in thick and large parts of castings, and the qualified rate of castings is low. Air blowing and air cooling can easily cause the casting to produce air-breathing oxidation and combustion, resulting in secondary casting defects. For this reason, some foundry companies use cooling parts to conduct heat to solve shrinkage and porosity defects. When using cooling parts to conduct heat, they usually set the cooling parts on the wax mold during the shell making process. The main disadvantage of this method is that the cooling parts will be The molding shell process needs to b...

AI Technical Summary

Problems solved by technology

[0002] In the process of traditional investment casting method, shrinkage cavity and porosity defects of castings are more common, especially in light alloys such as aluminum and magnesium investment casting, defects such as porosity and shrinkage cavity are easy to occur in thick and large parts of castings, and the qualified rate of castings is low. Blowing and air cooling can easily cause the casting to produce air-breathing oxidation and combustion, resulting in secondary casting defects

For this reason, some foundry companies use cooling parts to conduct heat to solve shrinkage and porosity defects. When using cooling parts to conduct heat, they usually set the cooling parts on the wax mold during the shell making process. The main disadvantage of this method is that the cooling parts will be The molding shell process needs to be roasted at high temperature, which will easily lead to oxidation of the outer surface of the cooling part and changes in the internal structure, reducing the cooling effect and affecting the quality of the casting product