Lost foam complex solvent formula for electric power storage (EPS) white mold shell mould casting process and method for manufacturing EPS white mold shell mould

Abstract

The invention relates to a complex solvent for coating the surface of a lost foam in a lost foam casting process and a method for manufacturing a shell mould in electric power storage (EPS) white mold shell mould casting process, which aim to provide a lost foam complex solvent formula with low cost and obvious softening and shrinking effects, can improve production efficiency and the qualification rate of casting products and is used for the EPS white mold shell mould casting process and a method for manufacturing an EPS white mold shell mould. Solvents in the lost foam complex solvent formula for the EPS white mold shell mould casting process comprise an adhesive, a softening and shrinking agent and a drying agent, wherein the adhesive accounts for 2 to 5 percent of the total mass, the softening and shrinking agent accounts for 40 to 60 percent of the total mass, and the drying agent accounts for 35 to 55 percent of the total mass; and the adhesive is organic resin or an inorganic adhesive, the softening and shrinking solvent is aliphatic ester or fatty acid, and the drying agent may be one or the mixture of more of ester, ketone, ethyl alcohol and hydrocarbon solvents.

Description

technical field [0001] The invention relates to a composite solvent used for coating on the surface of the lost foam in the lost foam casting process, and a manufacturing method of the shell mold in the EPS white mold shell mold casting process. Background technique [0002] The EPS white mold shell casting process is a casting process that combines the lost foam model (EPS material) with the traditional shell casting process. After manufacturing the EPS model, put the qualified EPS model into the prepared paint for dip coating, evenly hang a layer of paint, and then sprinkle quartz sand of different sizes on the model when the paint stops dripping, and then put The model that has been sprinkled with quartz sand is allowed to dry slightly, and then put into an aqueous solution of ammonium chloride to solidify. After several times of coating and sanding, the coating thickness of the model meets the requirements, and then it is put into a roasting furnace for further processin...

AI Technical Summary

Problems solved by technology

[0003] The advantage of this process is that the EPS white mold in the shell mold is fully roasted first, and then the pipe fittings are molded and cast. During the pouring process, the molten iron does not touch the white mold, and there is no cracking product caused by the molten iron enclosing the white mold in the lost foam process. However, the current process still has some defects, such as a small amount of moisture and foaming agent remaining in the white mold, and the moisture and foaming agent are vaporized during the heating of the white mold Function, the volume of the white mold expands, and the mold shell is partially swelled, resulting in an increase in the reject rate. In order to prevent the white mold from expanding during the heating process, the current process is to first put the prepared shell in the drying room to bake ( 40~120℃) for 16 hours, then put it into the heating furnace at low temperature (150~200℃) to soften slowly for 3 hours, after the white mold is softened, put it into the high temperature furnace (550℃) to gasify for 2.5 hours , the two-step process takes a total of 5.5 hours. The resulting problem is that although the pass rate has been greatly improved, the production efficiency is low and the production cost has increased significantly. The fuel cost alone is as high as 650 yuan / ton, which leads to The technical benefits of the project are difficult to realize