Free-cutting copper alloy material processing technique

Abstract

The invention discloses an environment-friendly and free-machining copper alloy material and a processing technique thereof. The environment-friendly and free-machining copper alloy material consistsof one of 57 to 67 percent of Cu, 0.2 to 3.0 percent of Sb, 0.20 to 3.0 percent of Si, 0.05 to 2.0 percent of Al, 0.05 to 0.20 percent of P, Pb less than or equal to 0.01 percent, ferrum (Fe) less than or equal to 1 percent, magnesium (Mg) less than or equal to 0.3 percent, rare element (RE) less than or equal to 0.3 percent, boron (B) less than or equal to 0.5 percent, titanium (Ti) less than orequal to 0.5 percent, remaining zinc (Zn) and impurities; the environment-friendly and free-machining copper alloy material is processed by adopting a squeezing technique that consists of working procedures of batch feeding, fusion casting, heating, squeezing, sizing, examining and packaging or a stretching technique that consists of working procedures of batch feeding, fusion casting, heating, squeezing, sizing, stretching, length cutting, examining and packaging. The environment-friendly and free-machining copper alloy material that is processed by the invention has the cutting performance of Manila gold, achieves the goal of non-lead environmental protection, compared with existing processing techniques, saves intermediate annealing and lowers cost.

Description

technical field [0001] The invention belongs to the field of nonferrous metal processing, and in particular relates to a free-cutting copper alloy material and a processing technology. Background technique [0002] Lead brass has excellent properties such as easy cutting, mechanics, and physics, and is a widely used copper alloy. The utilization rate of brass water pipes in developed countries is as high as 90%. Free-cutting lead brass is a two-phase brass, and lead is dispersed in the grain and grain boundary as fine particles. When copper is used as drinking water pipe fittings such as faucets and pipe joints, lead will be leached into the water under the action of substances in the water, because lead is a harmful element that can cause serious harm to the environment and human body, so its application is increasingly strict limit. In order to reduce the harmful effect of lead, researchers have systematically studied the corrosion performance of brass, and have taken va...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that lead-free brass replaces lead brass, the present invention provides a kind of environment-friendly free-cutting copper alloy material and processing technology, is to add antimony (Sb), silicon (Si) into copper (Cu)-zinc (Zn) ), aluminum (Al), iron (Fe) or magnesium (Mg) or boron (B) or titanium (Ti) or one of the rare earth elements and phosphorus (P) and other elements, using antimony with a low melting point in copper A certain solid solubility, and the characteristics of aggregation at the grain boundary, the formation of intermetallic compounds in the alloy, to achieve the characteristics of brittleness but not hard, by adding metal elements that can refine the grains, the intermetallic compounds containing antimony are hardened The brittle phase particles are evenly and finely distributed in the grain boundary and in the grain, thus effectively inhibiting the brittle fracture caused by antimony, and then making the alloy have the cutting performance of leaded brass, and increasing the casting fluidity, wear resistance and welding To achieve the goal of lead-free environmental protection