Casting method of large-area thin-wall part

Abstract

The invention discloses a casting method of a large-area thin-wall part. The casting method includes the following steps of S1, preparing of silica sol coating; S2, slurry pasting, wherein a wax moldwith the shape the same as that of the large-area thin-wall part is soaked in the silica sol coating, and the surface of the wax mold is wet by the silica sol coating; S3, sand hanging, wherein aftersand grains are evenly attached to the coating on the surface of the wax mold,drying is carried out; S4, repeating of S2 and S3, wherein multiple times of slurry pasting and sand hanging are carried out, and a multi-layer mold shell is prepared; S5, dewaxing, wherein the mold shell is obtained; S6, roasting of the mold shell; and S7, casting and then natural cooling, wherein the large-area thin-wall part is obtained after mold release. When the large-area thin-wall part is cast, casting process parameters are improved, when the large-area thin-wall part is cast through precision casting, a heat mould gravity casting manner wide in application range is used, string breaking generated in the casting process is avoided, the casting defects of shrinkage porosity and cavities can be overcome, the percent of pass of casting products is increased, and the casting cost of the large-area thin-wall part is reduced.

Description

technical field [0001] The invention belongs to the technical field of precision casting, and in particular relates to a large-area thin-wall casting method. Background technique [0002] At present, silica sol precision casting in the precision casting process is also called investment precision casting. This casting process is a casting process with less cutting or no cutting. It has the advantages of high dimensional accuracy and good surface quality. More advanced technology. When the precision casting process is used to produce large-area thin-walled parts, due to the structural characteristics of large-area thin-walled parts, more casting defects are prone to occur in production. The strength of the shell will make the mold shell too thick, resulting in poor exhaust and uneven heat dissipation when pouring molten steel, and tissue shrinkage and deep pores will occur on the surface of the product. [0003] Due to the thin wall of large-area thin-walled parts, when the...

AI Technical Summary

Problems solved by technology

In order to overcome the deficiencies of thermal gravity pouring, most of the existing technologies use vacuum pouring. Vacuum pouring is an important processing technology in the product molding process, which can avoid the contact between the mold shell and the air, and no oxidation reaction will occur during the pouring process, and the formed product is fine. Uniformity, less air bubbles, and relatively low reject rate, but the existing vacuum casting equipment is expensive and the production cost is high