A High Performance Investment Casting Shell

Abstract

The invention discloses a high-performance investment casting mould shell, and relates to the technical field of casting. A manufacturing method for the high-performance investment casting mould comprises the following steps of: (1) uniformly mixing 500-mesh quartz sand, rare earth, an ethyl silicate-rosin complexing agent and activated bentonite to obtain a mixture I, adding the mixture I into a high-speed stirrer to stir, thereby obtaining mould shell inner-layer slurry; mixing 200-mesh quartz sand, the ethyl silicate-rosin complexing agent and activated bentonite to obtain a mixture II, adding the mixture II into a high-speed stirrer, and stirring to obtain mould shell outer-layer slurry; (2) uniformly coating the mould shell inner-layer slurry to the surface of a wax mould, drying, and uniformly coating the mould shell outer-layer slurry, thereby obtaining a coated wax mould; (3) uniformly bundling the surface of the coated wax mould by an iron wire; and (4) putting the coated wax mould at a high temperature to perform wax melting treatment, and completely melting the wax mould to obtain the needed casting mould shell. The manufactured investment casting mould shell can cast a cast piece with higher precision and surface roughness, is high in high temperature resistance and strength, and is low in retained strength.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a high-performance investment casting shell. Background technique [0002] Investment casting usually refers to the pattern made of fusible materials, the surface of the pattern is coated with refractory material to make a shell, and then the pattern is melted and discharged from the shell, so as to obtain a casting without parting surface, which can be filled with sand after high temperature roasting The pouring scheme is usually made of waxy materials in the prior art. In recent years, with the development of investment casting technology, the surface quality and dimensional accuracy of precision castings have become higher and higher. Therefore, the coating and shell mold The quality puts forward higher requirements. The commonly used binder in investment casting is water glass, because it contains Na 2 O, and at high temperature, the shell strength is low and the...

AI Technical Summary

Problems solved by technology

[0002] Investment casting usually refers to the pattern made of fusible materials, the surface of the pattern is coated with refractory material to make a shell, and then the pattern is melted and discharged from the shell, so as to obtain a casting without parting surface, which can be filled with sand after high temperature roasting The pouring scheme is usually made of waxy materials in the prior art. In recent years, with the development of investment casting technology, the surface quality and dimensional accuracy of precision castings have become higher and higher. Therefore, the coating and shell mold The quality puts forward higher requirements. The commonly used binder in investment casting is water glass, because it contains Na 2 O, and the shell strength is low and the deformation is large at high temperature, resulting in a decrease in casting precision and an increase in surface roughness, so it is suitable for the production of investment castings that do not require high surface quality

Silica sol is a kind of binder in investment casting. The silica sol in the silica sol shell is solidified by evaporation of water. The environmental conditions are harsh, and the strength of the shell at room temperature is low, and the shell making cycle is long, which greatly affects the production efficiency.