Process for producing ultra-fine copper wire

Abstract

The invention discloses a process for producing an ultra-fine copper wire. The process comprises the following steps of: 1) dragging a oxygen-free copper rod: preheating and drying electrolytic copper, smelting the electrolytic copper into a smelting device, covering the surface of a copper solution with charcoal and graphite scale, performing on-line degassing and deoxidization, dragging a copper rod in a clutch type vacuum environment by a dragging machine set, and sending the copper rod into a take-up device; 2) performing continuous extrusion, namely continuously extruding the oxygen-free copper rod to form a copper wire, and cooling and drying the copper wire through a vacuum anti-oxidization pipe and a water tank; and 3) drawing, namely drawing the copper wire for many times, wherein emulsion is used for lubricating and cooling the copper wire during the drawing process, and the copper wire is drawn greatly first till the diameter is 1mm to 3mm and then drawn till the diameter is 0.1mm to 0.5mm, resistance internal heat type continuous annealing is adopted, and finally the copper wire is drawn finely until the diameter of the copper wire is 0.01 to 0.05mm to obtain the ultra-fine copper wire. The process has the characteristics of short flow, high production efficiency, low wire breakage rate and the like.

Description

technical field [0001] The invention relates to a production process of ultrafine copper wire, which belongs to the technical field of nonferrous metal processing. Background technique [0002] Ultra-fine copper wire is widely used in household appliances, microelectronics, and IT products, such as micro-motors, relays, small transformers, inductors, oscillating coils, audio coils, etc. It is generally required that ultra-fine copper wire has high conductivity, and the length of a single wire exceeds 5,000 meters. Because ultra-fine copper wire is prone to problems such as disconnection during processing, the general yield is low. At present, only middle and low-end products can be produced in China, and the wire diameter is relatively Thick, above 0.05mm, and the length of a single line is within 3 kilometers. [0003] At present, there are three main production processes for preparing ultra-fine copper wire: 1. Continuous casting and rolling low-oxygen copper rod-rolling-...

AI Technical Summary

Problems solved by technology

[0004]Through production practice, it is found that these three processes have shortcomings: the first process adopts continuous casting

[0005]Rolling low-oxygen copper rods, the oxygen content of the copper rods is relatively high, generally 200ppm~400ppm; at the same time, the continuous casting and rolling process needs to pass through the holding furnace, chute, intermediate It is relatively easy to cause spalling of the refractory material when transporting copper liquid in a package. The hot rolling process needs to pass through the rolls, causing the iron to fall off, which will bring external inclusions to the copper rod.

However, the rolling in of oxides on and under the skin during hot rolling will have an adverse effect on the drawing of low-oxygen rods.

The second process adopts the up-leading oxygen-free copper rod as the cast structure, without heat processing in the production process, the up-leading oxygen-free copper rod is prone to pores, shrinkage, and rough surface, which is prone to breakage in the subsequent wire drawing process. Wire

The third process uses directional solidification technology to combine columnar single crystals with subsequent plastic processing, which has the disadvantages of low production efficiency and high energy consumption.