High-aluminium vanadine moulding sand, and its preparing method

Abstract

This invention relates to a high bauxite molding sand and its preparation method composed of a high bauxite, high Al powder, 85% rare H3PO4 solution and bentonite, in which, the high bauxite and the Al powder are the main materials, 85% rare H3PO4 is a bond matched with suitable bentonite in the following weight percentage: high bauxite: 55-75, high Al powder 25-40, 85% rare H3PO4 solution 5-15 and bentonite 2-5. The preparation method includes: dry-mixing the bauxite and the Al power in a sand grinding machine, then adding the H3PO4 steadily to mix them in wet, finally adding bentonite to be mixed and taken out for standby and the mixed sand should be used within 12 hours for avoiding hardened.

Description

Technical field [0001] The invention relates to high-alumina vanadium clay molding sand and a preparation method thereof, belonging to the technical field of casting molding materials. Background technique [0002] At present, the known cast iron roller sleeves are usually manufactured by centrifugal casting. The molding materials are generally clay sand and lead powder paint. The pouring temperature is 1320°C-1420°C and the centrifugal time is 30 minutes-60 minutes. Damage, resulting in serious sticky sand defects, resulting in difficulties in cutting and processing workpieces, affecting product quality, and even quality accidents such as fire and sand inclusions. Contents of the invention [0003] Aiming at the above-mentioned deficiencies, the present invention has invented a high-alumina vanadium clay molding sand and its preparation method through repeated tests. The invention can not only produce high dry strength and high-temperature resistance strength after moldin...

AI Technical Summary

Problems solved by technology

[0002] At present, known cast iron roller sleeves are usually manufactured by centrifugal casting. The molding materials are generally clay sand and lead powder paint. The pouring temperature is 1320°C-1420°C and the centrifugal time is 30 minutes-60 minutes. Damage, resulting in serious sticky sand defects, resulting in difficulties in cutting and processing workpieces, affecting product quality, and even quality accidents such as fire and sand inclusions