Free-cutting lead and zinc containing white copper and machining method thereof

Abstract

The invention provides a free-cutting lead and zinc containing white copper and a machining method thereof. The zinc white copper comprises the following components in percentage by weight: 43.0 percent-47.0 percent of copper, 10.0 percent-14.0 percent of nickel, 1.0 percent-1.5 percent of lead, 3.0 percent-6.0 percent of manganese and 0.04 percent-0.08 percent of rare earth and the balance of zinc and inevitable impurities. The machining method comprises the steps of smelting, semi-continuous casting, hot extrusion, cold machining, thermal treatment and the like. The most prominent characteristic of the machining method is that the detect that the traditional free-cutting lead and zinc containing white copper can only be subjected to cold machining and cannot be subjected to thermal machining is overcome, the free-cutting lead and zinc containing white copper obtained according to the machining method can be subjected to cold machining and thermal machining, the machining period of the material of the class is shortened, and the problem of difficulty in machining of the material of the material is solved; and the copper alloy provided by the invention has higher strength and more excellent cutting performance; the cutting performance of the copper alloy is the same to that of the material of the class; and the copper alloy can be machined into wire rods and bar materials which are widely used for manufacturing industries of pen points, accessories of glasses, zippers, clocks, accessories of instruments and the like.

Description

technical field [0001] The invention relates to an easy-cut lead-containing zinc-nickel-nickel alloy and a processing method thereof, in particular to a zinc-nickel-nickel alloy with excellent cold and hot processing performance, cutting performance and mechanical performance and a processing method thereof. Background technique [0002] The lead-containing free-cutting zinc-nickel-nickel material is made by adding lead element to zinc-nickel-nickel copper. Due to the addition of lead element, it has good machinability. The alloy has good physical properties and cutting performance. After being processed into parts, the size is accurate, the finish is high, and the color is silvery white. At present, there are mainly two kinds of lead-zinc nickel copper commonly used at home and abroad, namely CuNi17Zn18Pb1.8 and CuNi15Zn24Pb1.5. Afterwards, swivel forging, cold rolling and other processes are carried out, and multi-pass annealing is carried out in the middle. After process...

AI Technical Summary

Problems solved by technology

Since the microstructure of CuNi17Zn18Pb1.8 and CuNi15Zn24Pb1.5 materials is composed of α phase + Pb phase, the material is not easy to be hot-worked, only cold-worked, and cold-worked is more difficult. Generally, the total processing passes from the billet to the final product are up to More than 30 passes, and the processing amount of each pass is very small. Generally, in the diameter direction, the processing amount of each pass is less than 1mm. In addition, it is easy to crack during processing, and it is also easy to crack during annealing, and the yield is low.

Images