Refining agent for brass smelting and brass casting method

Abstract

The invention discloses a refining agent for brass smelting. The refining agent is characterized by comprising the following components of, in percentage by mass, 5-20% of quartz sand, 10-30% of potassium chloride, 10-30% of sodium carbonate, 5-20% of cryolite, 5-10% of sodium aluminate and the balance of dolomite and inevitable impurities. By controlling the adding amount of the dolomite, the quartz sand, the potassium chloride, the sodium carbonate, the cryolite and the sodium aluminate, a melt of copper alloy is purified, the problems of sand holes and pin holes of a blank are greatly solved, and the airtight quality of a casting blank is improved.

Description

technical field [0001] The invention relates to a refining agent for brass smelting and a brass casting method. Background technique [0002] The air valve is also called the air-tight mouth, which is mainly composed of the air valve and the seal. The valve is a machined part, and the raw material is copper and aluminum. , is an indispensable safety component in the automotive industry. Valves are usually made of brass, because brass has excellent cutting performance and ductility, but copper products are prone to corrosion during use, and react with oxygen, carbon dioxide and water in the air to form Cu 2 (OH) 2 CO 3 , referred to as patina, so the surface treatment of copper products will be done, and the commonly used methods are nickel plating, chrome plating, etc. After more than ten years of rapid development, China's valve industry has dominated the world. At present, my country's valve output accounts for more than 70% of the world's total output of valves, rank...

AI Technical Summary

Problems solved by technology

The airtight quality of the blank is the most important for the safety of the valve, and the airtight quality is mainly related to the problem of trachoma and pinholes in the brass blank used for the valve, because it will directly affect the inflation and pressure of the tire, and the existence of trachoma Brass valves with pinholes and pinholes cause great safety hazards to bicycles and cars during driving, and trachoma and pinholes will cause poor finish on the brass surface and are prone to corrosion. In view of this, it is necessary to ensure product quality from the source of materials. Greatly eliminate the trachoma and pinhole problems of the billet; the trachoma mainly comes from the melting and casting process of the material, and the melting impurities are not completely refined during the casting process, resulting in the existence of corrosive oxides such as silicon, calcium, iron, etc. in the billet, and at the same time The existence of gas inside the melt will also lead to a large number of clusters of fine needle-shaped pores, which need to be polished to find them, so it is urgent to develop a refining agent for valve brass smelting

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