Method of silica sol narrow-channel closed impeller easy to clear shell

Abstract

The invention discloses a method of a silica sol narrow-channel closed impeller easy to clear a shell, and aims to provide a method with the advantages that sand on the surface of the large-diameter closed impeller of a casting piece can be conveniently cleared, the surface is bright and clean, and the casting piece similar to a high-temperature high-pressure silica sol mold shell product is ensured. The invention provides the technical scheme points that the method comprises the steps of S01, dewaxing; S02, roasting; S03, casting; S04, clearing the sand; and adopting a silica sol mold shell for dewaxing, wherein the dewaxing is carried out on the mold shell according to the parameters that the vapor pressure is 98kPa, the temperature is 100 DEG C, and the time is 15 to 25min. The roastingtemperature of the mold shell remains unchanged, and other casting processes remain unchanged. The sand of the large-diameter closed impeller of the casting piece is easy to clear, the surface is bright and clean, and the casting piece similar to the high-temperature high-pressure silica sol mold shell product is ensured. The problem that the large-diameter narrow-channel closed impeller adopts an alkali-explosion sand-clearing process is thoroughly solved. Meanwhile, the safety production of employees is further guaranteed.

Description

technical field [0001] The invention belongs to the field of sand cleaning of a closed impeller, in particular to a method for easily cleaning a closed impeller with a narrow channel of silica sol shell. Background technique [0002] At present, the Chinese patent whose publication number is CN1792507A discloses a kind of high temperature alkali blast sand removal process in the foundry industry. -780 degrees; (2) Place the stainless steel precision casting with complex cavity in the stainless steel hanging basket, intrude the heated lye, so that the inside and outside of the casting can be heated evenly; (3) Lift it out quickly, and immediately put it into cold water at room temperature for rapid cooling , so that the residual sand is separated from the casting; (4) The casting after alkali explosion can be neutralized by putting it in 10% industrial hydrochloric acid aqueous solution for 1-2 minutes, and then take it out and rinse it with water. The beneficial effects are...

AI Technical Summary

Problems solved by technology

In order to ensure the smooth surface of the material, silica sol with high viscosity can only be used for manufacturing, but the industry generally uses water glass investment molding manufacturing technology for the manufacture of such closed narrow channel impellers, but the viscosity of the water glass mold shell The hardness is low, which leads to the rough inside and outside of the casting. However, the use of silica sol investment mold manufacturing is mainly because the sand cannot be cleaned in the narrow channel, so the operation is difficult and extremely unsafe alkali explosion treatment is used.

And it is difficult to clean up even after the alkali explosion treatment once, and sometimes it is necessary to repeat the alkali explosion treatment