Shell filler assisting shell manufacture in investment casting and method filling shells by adopting filler

Abstract

The invention provides a shell filler assisting shell manufacture in investment casting and a method filling shells by adopting the filler. The shell filler is characterized by comprising the following components in parts by weight: ammonium dihydrogen phosphate 6-20, quartz and / or fused quartz: 58-83, magnesium oxide 5-18, monomagnesium phosphate: 0.3-8andorganic silicon defoamer: 0.002-0.3; and the method is characterized by comprising the steps of filling shells with the shell filler through operations including preparing shells to be filled, preparing size, pouring the size to fill the shells, solidifying, drying, then smearing and the like. The shell filler assisting shell manufacture in investment casting and the method filling shells by adopting the filler can resolve the problems of cast piece inner cavity shiming and shell runout during casting with low cost, and shorten shell manufacture period of silica solution shells with blind holes; and moreover, the shell filler further has the advantages of being good in mobility and filling performance and capable of self-solidification and the like.

Description

technical field [0001] The invention belongs to the field of casting modeling, and in particular relates to a shell filling material for auxiliary shell making in investment casting and a method for filling the shell with the filling material. Background technique [0002] It is understood that the existing method of forming complex internal cavities of metal castings is to set cores in the mold. [0003] The investment casting process is suitable for mass production of castings with complex inner cavities, because wax patterns with complex inner cavities can be manufactured efficiently by designing complex dies with core pulling. However, in investment casting, manufacturing a wax pattern with a complex cavity does not mean that a casting with a complex cavity can be produced. When the inner cavity of the wax mold is relatively narrow, usually only two layers of coating (paint and hanging sand) are applied, and only a relatively narrow and deep channel is left here. If you...

AI Technical Summary

Problems solved by technology

[0005] Disadvantages of the existing technology: due to the narrow inner cavity of the wax mold, the narrow opening will be blocked by paint and sand, and normal coating cannot be obtained. These shell defects will lead to iron inclusion defects inside the casting, and even shells will appear in severe cases. Running out of fire, resulting in the scrapping of the entire group of castings; high cost of prefabricated cores for investment casting