Mixed metal abrasives for cleaning cast and production technology

Abstract

The invention discloses a mixed metal abrasive for cleaning castings and a production process, belonging to the field of metal abrasives and a production process specially used for surface cleaning of castings. It is mainly used in the surface polishing treatment of medium and large parts in automobile castings, such as cylinder blocks and flywheel discs. The weight ratio of steel shot S550: steel grit GP14: steel grit GL14 is 15-25%: 55-75%: 10-20%. Or the weight ratio of steel shot S460: steel grit GP16: steel grit GL14 is preferably 20%: 60%: 20%. The production process includes smelting, atomization granulation, drying, screening, quenching, crushing, tempering, screening, mixing, and packaging. The cleaning efficiency of mixed metal abrasives is 15%-20% higher than that of ordinary single steel shot, and the shot blasting time is reduced by 15%. Because the internal quality of steel grit is better than that of steel shot, there is no hollowness and cracks, steel grit consumes more than steel shot when the edges and corners are rounded in the machine, but wears less than steel shot when the edges and corners are rounded, and the overall consumption is 15% lower %about.

Description

Technical field [0001] Mixed metal abrasives and manufacturing processes for cleaning castings belong to the field of metal abrasives and manufacturing processes for surface cleaning of castings. Mainly used in the surface polishing of medium and large parts in automobile castings, such as cylinder blocks and flywheels. Background technique [0002] Cast steel shots are generally used to clean the surface of castings. Automobile castings, especially medium and large castings, use three types of steel shots: S460, S550, and S660. According to the current use of domestic casting factories and industry development trends, there are the following problems: [0003] Nowadays, casting cleaning mostly uses a single steel shot for shot blasting. After this shot blasting, the abrasive in the shot blasting machine contains many small particles, and the shot blasting silo is full. New steel shots cannot be added. If the ratio is too large, the sand cannot be effectively cleaned. After a per...

AI Technical Summary

Problems solved by technology

[0004] With the improvement of the degree of industrialization, the improvement of production efficiency is becoming more and more important, and the same is true for the production of castings, but now it is obviously impossible to speed up the cleaning speed with a single steel shot for shot blasting, which will affect the improvement of production efficiency

[0005] The production of steel shot is naturally formed, and the steel shots of large and small particles are mixed and formed together. The proportion of each model S460S550S660 is about 5%. According to the total output of steel shots of 300,000 tons per year in China, the total output of these three models About 40,000-50,000 tons, the demand for this type of industry other than automobile casting (such as steel structure and other industries) accounts for about 30%, and about 10% of the output is exported to foreign countries. China's annual output of automobile castings is 500 More than 10,000 tons, the demand for these three types of steel shots is about 40,000 tons, so these three types of steel shots are relatively in short supply, and some casting manufacturers have to use other types of steel shots for shot blasting. Pill quality is difficult to guarantee