Shell making process of silica sol shell with high deshelling property

Abstract

The invention discloses a shell making process of a silica sol shell with high deshelling property. The shell making process comprises the following steps: S1, uniformly mixing powder with silica solwith stirring, and adding a wetting agent and a defoamer to form a first mixture; S2, immersing a wax mold into the first mixture, taking the wax mold out, scattering sand into the wax mold, and drying to obtain a first-layer mold shell; S3, repeating the step S2 until second to sixth layers of mold shells are obtained; S4, drying the wax mold including the first to sixth layers of mold shells tocomplete sealing; S5, calcining the wax mold including the first to sixth layers of mold shells to obtain a mold shell casting. According to the shell making process of the silica sol shell with highdeshelling property disclosed by the invention, fully-calcined aluminosilicate refractory sand powder, free iron and hard kaolinite with low diaspore content is taken as a main material of the silicasol shell, and is combined skillfully with quartz sand, so that the high-temperature strength of the mold shell is ensured, and the retained strength after mold shell pouring can be lowered greatly.

Description

technical field [0001] The invention belongs to the technical field of silica sol mold shell casting, and in particular relates to a process for making shells with high peeling performance of silica sol mold shells. Background technique [0002] Poor "shellability" has always been one of the main disadvantages of precision casting silica sol shells. This shortcoming is not only one of the biggest obstacles in the transformation of my country's traditional water glass shell to the internationally unified silica sol shell process, but also an industry problem that is still being explored by domestic and foreign investment casting circles. [0003] The poor peeling performance of the shell (casting) not only greatly increases the workload and cost of post-processing of the casting, but also affects the delivery time and surface quality. Improving the "shelling" of the silica sol shell has become a common concern in the industry. Key technical improvement directions. Contents...

AI Technical Summary

Problems solved by technology

[0003] The poor peeling performance of the shell (casting) not only greatly increases the workload and cost of post-processing of the casting, but also affects the delivery time and surface quality. Improving the "shelling" of the silica sol shell has become a common concern in the industry. Key technology improvement direction