A method for detecting and improving the quality of precision casting moulds

Abstract

The invention discloses a method for detecting and improving the quality of a precision casting mold. The method comprises the following steps: detecting micro-cracks of the mold by using gasoline added with a saddening agent at the temperature of 80-90 DEG C, cleaning by using a sulfuric acid solution, and finally, plugging the cracks by using a plugging material. The gasoline serves as a detection solvent, so that tiny cracks can be detected; meanwhile, due to the using of the saddening agent, the cracks can be enlarged so as to be conveniently plugged, the gasoline is darkened, and the cracks are conveniently observed; the sulfuric acid solution is used for cleaning, so that not only can the gasoline and other substances adhered to a mold shell be removed, but also crack gaps can be properly enlarged, and thus the cracks are conveniently plugged. The mold shell treated by the method according to the invention is completely not broken, a runout phenomenon is avoided during cast molding, and the yield of the precision casting mold shell is greatly improved.

Description

technical field [0001] The invention relates to the technical field of precision casting castings, in particular to a method for detecting and improving the quality of precision casting molds. Background technique [0002] Conventional precision casting molds are carried out at high temperature. Because they work at high temperature for a long time, especially the shell-making cycle is about one week, and large castings need ten days. During the shell-making process, there are factors such as temperature difference or manual operation. There will be some tiny cracks. When the molten metal is poured into the mold shell, the cracks will expand due to the sharp rise in temperature, and even the molten metal will flow out, so the casting cannot be cast. [0003] The conventional detection and repair method is to put water at 80-90°C into the mold shell, mark it to indicate it, and then use a plugging material to plug it. The disadvantage of this method is that there are hydrogen...

AI Technical Summary

Problems solved by technology

[0002] Conventional precision casting molds are carried out at high temperature. Because they work at high temperature for a long time, especially the shell-making cycle is about one week, and large castings need ten days. During the shell-making process, there are factors such as temperature difference or manual operation. There will be some tiny cracks. When the molten metal is poured into the mold shell, the cracks will expand due to the sharp rise in temperature, and even the molten metal will flow out, so the casting cannot be cast.

[0003] The conventional detection and repair method is to put water at 80-90°C into the mold shell, mark it to indicate it, and then use a plugging material to plug it. The disadvantage of this method is that there are hydrogen bonds and intermolecular bonds between water molecules. The role of force, there is a mutual attraction between water molecules, which will exist even at high temperatures, sometimes water can not soak into some tiny cracks, and these tiny cracks will sometimes be enlarged during the long-term casting process, and finally affect casting quality