CN105913969A

CN105913969A - Preparation method for copper clad aluminum composite filament

Info

Publication number: CN105913969A
Application number: CN201610253239.9A
Authority: CN
Inventors: 罗奕兵
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-04-22
Filing date: 2016-04-22
Publication date: 2016-08-31

Abstract

The invention provides a preparation method for a copper clad aluminum composite filament. The preparation method comprises the steps that 1) an aluminum core and a copper tube fit with the external diameter of the aluminum core in a transition way are selected, deoiling and film oxidation are performed on the metal surface, and drying and assembling are performed in a vacuum operation box; 2) an assembled composite bar is heated through induction and then prepared into copper clad aluminum composite filament material of which the diameter is 1-2mm through groove rolling or stretching; 3) when cold deformation is 95-99% of reduction of area, annealing processing is performed on the composite filament material, wherein annealing temperature is 200-400 DEG C and annealing time is 0.1-0.5h; and 4) the copper clad aluminum filament material is stretched into the filament of which the diameter is 0.05-0.5mm in a multimode water tank having ultrasonic vibration, wherein the lubricant is kerosene or lubricating oil, oil temperature is 150-250 DEG C and ultrasonic frequency is 10-50Hz.

Description

A kind of preparation method of copper cladded aluminum composite thin silk

Technical field

The present invention relates to the preparation method of a kind of bimetallic composite microwires, a kind of transverse section is circular copper cover aluminum Composite filaments preparation method.

Background technology

Along with developing rapidly of electronic information technology, precise electronic instrument and sensor increasingly towards miniaturization, in high precision Direction is developed, and wire used to signal transmission is had higher requirement.Copper cover aluminum composite microwires is excellent owing to having given full play to copper Different conductive characteristic and the low-density advantage of aluminum, can significantly reduce the weight and volume of coil, meet micromachine and sensing The use requirement of device coil wire, can have broad application prospects at the aspect such as miniature electronic, semiconductor device.

At present, the preparation main method of existing copper cladded aluminum composite thin silk has, and 1) aluminum steel copper-plating method, it is thick to there is coating in this method Spend limited, in uneven thickness, the shortcoming such as between coating and core bond strength is relatively low；2) hydrostatic extrusion+annealing+the most secondary drawing Method [Liu Xinhua, etc., copper cladded aluminum composite thin flat wire and preparation method thereof [P], Chinese invention patent, the patent No.: CN200710178703.3,2007-12-04], it is big that the method has equipment investment, and technological process is long, and production efficiency is the highest；And And owing to the yield strength ratio of copper/aluminum is relatively big, cause the copper-clad coating flow of metal relative difficulty when hydrostatic extrusion, layers of copper gold Belong to flowing relatively slow, thus Bamboo-shaped fracture defect easily occurs in copper-clad coating tension stress；3) tube-weld cladding technique or rolling crimping+ Hubbing, this type of method, owing to single pass deformation is less, compound interface bond strength is little, it is difficult to produce the high-performance of minor diameter Composite filaments.

Summary of the invention

The present invention is directed to the deficiency of existing copper alclad filament production technology, it is provided that the preparation side of a kind of copper cladded aluminum composite thin silk Method, its preparation method is as follows:

1) selecting aluminum core and the copper pipe with aluminum core external diameter interference fits, metal surface is through deoiling and oxide-film, at vacuumizing case In be dried and assembling, after assembling two ends use local plastic deformation mode seal；

2), after the sensed heating of compound bar assembled, then it is prepared as through groove rolling or stretchingφ1-2 mm copper cover aluminum is combined Silk material；

3) being the contraction percentage of area about 95-99% when cold deformation, composite wire material makes annealing treatment, and annealing temperature is 200-400 DEG C, annealing time 0.1-0.5h；

4) copper-clad aluminium wire material, is stretched in the multimode water tank of band ultrasonic activationφ0.05-0.5 mm filament, lubricant is coal Oil or lubricating oil, oil temperature is 150 ~ 250 DEG C, and ultrasonic frequency is 10 ~ 50Hz.

Compared with prior art, the present invention has a techniques below advantage:

1) compared with galvanoplastic, owing to composite wire is through strong cold large deformation, clad bond strength is high, compactness is more preferable；

2) copper pipe, aluminum core through deoiling, oxide-film process after, in vacuumizing case assemble, eliminate oxidation, simultaneously by local Plastic deformation, enclose the gap of copper pipe and aluminum core, make compound interface maintain high-cleanness and non-oxidation, improve interface cohesion strong Degree；

3) compared with hydrostatic extrusion method, the method production cost is relatively low；During hydrostatic extrusion, copper pipe and aluminium bar head must be processed into cone The operation of shape, operates complex；Though hydrostatic extrusion deflection is relatively big, but shorter for room temperature extruding and time, it is difficult to make copper, aluminum Atom fully spreads and forms real metallurgical binding, also needs subsequent anneal cooperation to process to improve bond strength, and the present invention adopts With sensing heating, according to blank size and coating thickness, adjust faradic current frequency and heat time heating time, make copper-clad coating and aluminum Produce bigger temperature difference between sandwich layer, reduce the ratio of the yield strength of copper/aluminum, from when recombination line base is prepared in plastic working, The deformation making clad and sandwich layer metal reaches unanimity, it is possible to increase the deflection of single pass, and can avoid copper clad laminar flow phase There is Bamboo knobs crack in difficulty；Meanwhile, rod base, under the dual function of sensing heating and temperature increasing by deformation effect, makes copper/aluminum multiple The conjunction interface energy long period maintains uniform temperature, promotes the diffusion between copper, aluminum atom, forms real metallurgical binding, favorably In obtaining high performance copper cladded aluminum composite thin silk；

4) compared with tube-weld cladding technique, rolling crimping, owing to the copper-clad coating of this type of method is copper strips welding or crimps into bag Coating, local is susceptible to layers of copper and peels off or come off；The present invention uses sensing to add heat energy and realizes bigger pass deformation simultaneously, Compound interface intensity can be promoted and exempt the defects such as layers of copper stripping, can effectively reduce wire broken rate when composite microwires produces；

5) use Ultrasonic Conditions lower header drawing composite filaments, reduce friction, use deep fat lubrication simultaneously, be equivalent to becoming Just as time carried out recovery annealing, the hardening of composite filaments can be reduced further, save composite filaments deformation intermediate annealing work Skill.

Detailed description of the invention:

Below in conjunction with embodiment, the invention will be further described:

Embodiment 2:φ0.08mm copper cladded aluminum composite thin wire shaping technology

1) selectφ16 mm aluminum cores and be the copper pipe of interference fits with aluminum core external diameter, copper pipe external diameter isφ20 mm, copper pipe length It is 200 mm, a length of 202 mm of aluminum core；Copper pipe inwall and aluminum core through deoiling and after oxide-film, be dried in vacuumizing case and Assembling, gives certain compression to the aluminum wick feed stretched out after assembling, to seal the gap between copper pipe and aluminium bar, it is to avoid compound The oxidation at interface；

2) compound bar billet assembled, after Frequency Induction Heating, is stretched to through multi-pass immediatelyφ2 mm copper cover aluminum composite filaments, Every time the contraction percentage of area is 15 ~ 30%, and lubricant is vegetable oil；

4)φ2 mm copper cover aluminum composite wire materials make annealing treatment under argon shield, and annealing temperature is 300 DEG C, and annealing time is 0.5h；

5)φ2 mm copper cover aluminum composite wire materials use the water tank multimode of band ultrasonic activation to be stretched toφ0.08 mm filament, lubrication Agent is kerosene, and every time deformation rate controls to be the contraction percentage of area 10 ~ 25%, and oil temperature is set as 150 DEG C, and ultrasonic frequency is 20 Hz。

Embodiment 1:φ0.06mm copper cladded aluminum composite thin wire shaping technology

1) selectφ26 mm aluminum cores and be the copper pipe of interference fits with aluminum core external diameter, copper pipe external diameter isφ30 mm, copper pipe length It is 300 mm, a length of 302 mm of aluminum core；Copper pipe inwall and aluminum core through deoiling and after oxide-film, be dried in vacuumizing case and Assembling, gives certain compression to the aluminum wick feed stretched out after assembling, to seal the gap between copper pipe and aluminium bar, it is to avoid compound The oxidation at interface；

2) compound bar billet assembled is after Frequency Induction Heating, and the ellipse-circular hole system rolling immediately entering multi-pass becomesφ6 mm copper cover aluminum recombination line bases, every time the contraction percentage of area is 8 ~ 30%；

3)φ6 mm copper cover aluminum recombination line bases, use multi-pass single mode to be drawn intoφ1.0 mm, lubricant is vegetable oil, every time The contraction percentage of area be 15 ~ 25%；

4)φ1.0 mm copper cover aluminum composite wire materials make annealing treatment under argon shield, and annealing temperature is 300 DEG C, annealing time For 0.5h；

5)φ1.0 mm copper cover aluminum composite wire materials use the water tank multimode of band ultrasonic activation to be stretched toφ0.06 mm filament, profit Lubrication prescription is kerosene, and every time deformation rate controls to be the contraction percentage of area 10 ~ 25%, and oil temperature is set as 200 DEG C, and ultrasonic frequency is 20 Hz。

Claims

1. a preparation method for copper cladded aluminum composite thin silk, its preparation process is characterised by: 1) select aluminum core and with aluminum core outside The copper pipe of footpath interference fits, metal surface, through deoiling and oxide-film, is dried and assembling in vacuumizing case, and after assembling, two ends are adopted Seal by the mode of local plastic deformation；2) after the sensed heating of compound bar assembled, then through groove rolling or stretching system Standby one-tenthφ1-2 mm copper cover aluminum composite wire material；3) being the contraction percentage of area about 95-99% when cold deformation, composite wire material is annealed Processing, annealing temperature is 200-400 DEG C, annealing time 0.1-0.5h；4) copper-clad aluminium wire material, at the multimode water of band ultrasonic activation Case is stretched toφ0.05-0.5 mm filament, lubricant is kerosene or lubricating oil, and oil temperature is 150 ~ 250 DEG C, ultrasonic activation frequency Rate is 10 ~ 50Hz.