Traditional free-cutting lead-free brass CNC machining parts are usually leaded brass with cutting performance and wear resistance, so it is widely used in various fields, such as electrical and electronic connectors, instrument parts, drinking water system water pipes, faucets, valves In the fields of, pipe joints, automobiles, firefighting and airplanes, when such brass CNC machined parts were scrapped, there were varying degrees of pollution in various uses, which also promoted the development trend of lead-free brass.
What is a lead-free brass CNC machined part?
Lead-free brass (Free cutting little-lead brass) CNC machining parts whose lead content meets the following standards. RoHs: Electronics and auto parts, Pb less than 0.1% (exception: copper alloy Pb less than 4.0%).
California AB 1953: Sanitary ware and various valves, Pb equivalent less than 0.25%. . This lead-free refers not to the lead content of the materials of pipelines, plumbing fixtures and fixed equipment, but the weighted average lead content of pipelines, plumbing fixtures and fixed equipment over the water surface does not exceed 0.25%, which is determined according to the prescribed formula. CDA (Copper Industry Association of America): Pb below 0.09%.
Characteristics of lead-free brass CNC machining parts
Excellent cutting performance, excellent hot punching, cold heading and ductility, good knurling, riveting performance, and corrosion resistance.
Application of lead-free brass CNC machining parts: 1. Suitable for all kinds of cold heading, bending and riveting parts, electronic and telecommunications connectors, connectors and other brass CNC machining parts that have ecological, environmental protection and sanitary safety requirements.
Development prospects of lead-free brass CNC machining parts
In recent years, relevant domestic colleges and scientific research institutions in China have been researching and exploring lead-free free-cutting brass CNC machining parts (mainly tellurium brass, bismuth brass, selenium brass, and silicon brass). The development prospects of Bi brass are the most promising.
This is because Bi is a brittle and hard silver-white non-toxic metal with pink flash. When the volume expands. Bismuth is a “green metal” that can be used safely. In addition to being used in the pharmaceutical industry, brass CNC machining parts are also widely used in semiconductors, superconductors, flame retardants, pigments, cosmetics, chemical reagents, electronic ceramics and other fields, which can replace lead. , Antimony, cadmium, mercury and other toxic elements.
Summarize
Lead-free brass CNC machining parts are an environmentally friendly material. Compared with ordinary leaded brass, the mechanical properties of lead-free brass CNC machining parts are better than those of leaded brass CNC machining parts, and the cutting performance is similar to that of leaded brass.
Copper is the same, but the cost of brass CNC machining parts is much lower than that of stainless steel. It has good hot forging performance and corrosion resistance, and has low environmental pollution. Bismuth brass has little pollution to the environment, low damage to the human body, and broad application prospects.