CN103695609A - High-frequency induction annealing device and technology for regulation and control of copper-clad aluminum composite flat bus - Google Patents
High-frequency induction annealing device and technology for regulation and control of copper-clad aluminum composite flat bus Download PDFInfo
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Abstract
The invention discloses a high-frequency induction annealing device and technology for regulation and control of a copper-clad aluminum composite flat bus. The high-frequency induction annealing device mainly comprises a guide roller, a driving device, a ceramic tube, temperature measuring device, an induction heating device, and an air blast cooling device. The high-frequency induction annealing device is characterized in that an induction heating power supply adopts high-frequency induction heating to improve the heating rate, shorten the heating time and control the interface layer thickness; an induction heating coil is designed to be flat similar to the cross-sectional shape of the copper-clad aluminum flat bus, so that in induction heating, the temperature distribution at different parts of the copper-clad aluminum flat bus is uniform, the heating time can be shortened, and the interface layer thickness is controlled; as the ceramic tube with a certain length is arranged, the temperature is uniform in heating, and the copper cladding layer and the aluminum core can be recrystallized synchronously; the annealed flat bus temperature can be quickly reduced to below 150 DEG C through a forced air cooling section, so that the thickness-increasing of the aluminum-copper interface is avoided; the aluminum-copper interface layer thickness is controlled within 2-3 microns.
Description
Technical field
The invention belongs to layered metal composite material field, relate to the compound flat row's interfacial layer thickness of a kind of copper cover aluminum and the regulatable high-frequency induction annealing device of performance and technique.
Background technology
The flat row of copper cover aluminum is a kind of bimetal stratiform matrix material, has the advantages such as low density, low cost, easy connection, can be widely used in the omnibus bar of distribution bus groove, medium-high frequency heating installation, various housing and field of metallurgy and chemical engineering etc.Copper cladding aluminum conductor or flat row be generally by certain compounding technology (see: Dai Yakang, etc. electric wire, 1997, (5): 25-28; Xie Jianxin, Deng. a kind of coating material horizontal continuous casting direct recombination forming apparatus and technique. Chinese invention patent: ZL200610112817.3.) first prepare copper cover aluminum composite blank, through post forming complete processings such as rolling, extruding or drawings, produce the product of certain section form and size again.After rolling or drawing forming, the tensile strength of copper-coated aluminium composite material and hardness raise, and stretching elongation after fracture obviously declines, and specific conductivity declines.Need before use to carry out stress relief annealing, to regulate and control the flat row's of copper cover aluminum mechanics and conductivity.In most of application scenarios, wish to obtain high as far as possible electric conductivity, and for situations such as needs bending machining, the compound flat row's of copper cover aluminum elongation after fracture is had relatively high expectations, thereby generally need to improve by isothermal annealing thermal treatment specific conductivity and the elongation of copper-coated aluminium composite material.Annealing region 200～500 ℃ (see: Wang Qiuna, etc. material engineering, 2008, (7): 30～35.).But then, there is significant difference in copper-coated aluminium composite material and single metal material,, because copper and aluminium are by interfacial phase mutual diffusion, copper-coated aluminium composite material in annealing heat treatment process when annealing temperature is higher, soaking time is when longer, easily cause interfacial layer thickness obviously to increase, in interface, generate hard and crisp intermetallic compounds layer, the interfacial combined function of copper-coated aluminium composite material, macro-mechanical property and conductivity etc. are had a negative impact.General annealing thermal treatment temp is higher, and interfacial layer thickness is larger.Research shows: when compound layer thickness between copper/aluminium interface metal is greater than after 2 μ m, the fracture at interface will change brittle rupture into from ductile fracture, interface bond strength significantly reduces (to be seen: Abbasi M, et al. Journal of Alloys and Compounds, 2001,319 (1-2): 233-241; Chen C Y, et al. Materials Transactions, 2006,47 (4): 1232-1239.).The flat row's electric furnace of the copper cover aluminum of continuous casting-Rolling Production isothermal annealing result of study is also shown, 250 ℃ of following annealing, interface bond strength raises with the rising of temperature; 300 ℃ of annealing rear interface places generate intermetallic compound, and interface bond strength decreases, but now organize, recrystallize does not occur yet, and elongation is lower, is difficult to meet bending property requirement; When 400 ℃ of annealing are after 1 hour, there is perfect recrystallization in tissue, elongation obviously increases, but more than interfacial layer thickness reaches 4 μ m, interface bond strength significantly reduce [see: Wu Yongfu. the large section copper cover aluminum of rectangle horizontal casting direct combination is shaped and complete processing basis [D]. Beijing: University of Science & Technology, Beijing, 2012.].
On the other hand, induction continuous annealing is widely used in process annealing or the finished products of various non-ferrous metal tubes, bar and wire rod (for single metal product) and [sees: Zhang Jinli, Deng. the online destressing process method of copper-alloy pipe-material and special purpose device. Chinese invention patent, ZL02132633.9; Nan Li, etc. rare metal wall bulletin, 2008, (2): 28-30.].Because the annealing product section of current single metal is for circular (pipe, pole, circle line) or close to circular (if section is square, pentagon, hexagon bar), therefore load coil be shaped as circle, transverse section Uniformity of Temperature Field is controlled easily.Induction continuous annealing has uniform in quality and high conformity, annealing speed is fast, production efficiency is a little high.Because medium frequency induction power supply equipment is easily realized high-power, be conducive to adopt higher delivery speed when annealing, so respond at present continuous annealing, adopt heating in medium frequency mode more, but heating in medium frequency speed is slower, less on single metal impact, but because the flat row of copper cover aluminum is bimetal stratiform matrix material, the thicker interfacial layer of long easily formation heat-up time.In addition, because copper and two kinds of melting point metals of aluminium and recrystallization temperature differ larger, and product is flat wide plate type section, and it is large that transverse section Uniformity of Temperature Field is controlled difficulty, and heritage is answered continuous annealing apparatus and technique, is difficult to be applied to the continuous annealing of this series products.
Summary of the invention
The object of the invention is the problems referred to above for the isothermal annealing method existence of existing routine, the flat row of a kind of copper cover aluminum is provided quick induction annealing method, adopt high-frequency induction heating to carry out fast induction annealing continuously to the flat row of copper cover aluminum, by quick Short Time Heating, significantly shorten the flat row of copper cover aluminum soaking time at high temperature, effectively suppress the flat row's interfacial layer thickness of copper cover aluminum and obviously increase phenomenon, thereby make the flat row of copper cover aluminum after annealing obtain evenly tiny copper aluminium recrystallized structure simultaneously, larger elongation, less interfacial thickness and high interface bond strength, effectively after solution annealing, flat row softens and interface bond strength reduction, the difficult problem that conductivity declines.
In order to reach above object, technical scheme of the present invention is:
The flat row's of copper cover aluminum a high-frequency induction Quick annealing device, this device comprises that this device is mainly comprised of guide roller, drive unit, vitrified pipe, temperature measuring equipment, induction heating device and cold wind blower.Its feature is: induction heating power adopts high-frequency induction heating to improve the speed of heating, shortens heat-up time, controls interfacial layer thickness; By load coil being designed to the flat pattern similar to the flat row's shape of cross section of copper cover aluminum, the uniformity of temperature profile of the flat row's different sites of copper cover aluminum while not only making induction heating, and improved heating efficiency, and be conducive to shorten heat-up time, control interfacial layer thickness; By the vitrified pipe of certain length is set, while making to heat, temperature is even, guarantees that copper-clad coating and aluminium core complete recrystallize simultaneously; By air blast cooling section is set, make below the flat row's temperature fast reducing to 150 ℃ after annealing, prevent that copper aluminium interface from significantly diffusion occurring in process of cooling again and thicken phenomenon, thereby be conducive to copper aluminium interfacial layer thickness to be controlled at 2～3 μ m.
Wherein, to be that limit copper alclad is flat come broad ways in continuous annealing process and be not offset the Main Function of described guide roller, and it is characterized by roller spacing can be according to the flat row's of copper cover aluminum width adjusting; The effect of described drive unit is mainly to drive the flat row of copper cover aluminum to pass through continuously heater coil with certain speed, it is characterized by by driving roll and drive-motor and forms, and drive unit can be set the flat row's of copper cover aluminum delivery speed as required; The effect of described vitrified pipe is mainly that the flat row of heated copper cover aluminum through is wherein incubated, and prevents that flat row's surface radiating is too fast, improves the homogeneity of copper cover aluminum flat row surface and internal temperature; It is characterized by vitrified pipe can adopt the refractory materials that thermal conductivity is lower to make; Vitrified pipe is arranged between load coil and the flat row of copper cover aluminum, section form is determined with coil and flat row's shape, be generally rectangular pipe, vitrified pipe inwall and the flat row's of copper cover aluminum outside surface should have the gap of 3～10mm, to facilitate flat row through wherein, vitrified pipe outer wall coordinates with load coil endoporus, with convenient for assembly, is as the criterion; Vitrified pipe length determines according to continuous annealing speed and stitch length, and generally get stitch length 2～4 times, the extrusion of general heater coil outlet one end vitrified pipe is more longer than coil entrance one end; The effect of described temperature measuring equipment is that the surface temperature during by heater coil is measured to the flat row of copper cover aluminum, it is characterized in that adopting non-contact infrared measuring apparatus, its temperature-measuring range should be between 100～550 ℃, temperature measurement location is arranged on load coil middle part, and temperature probe extend into the position that approaches copper cover aluminum surface by the aperture of offering specially on winding space and vitrified pipe; Described induction heating device is comprised of high frequency electric source and load coil, and effect is that the flat row of copper cover aluminum through coil is arrived to the temperature needing and kept the regular hour by electromagnetic induction heating, realizes the regulation and control to microstructure and property; The shape of cross section that it is characterized in that heater coil is the rectangle similar to being heated the flat row's shape of cross section of copper cover aluminum, the interior hole dimension of heater coil is determined according to the shape of cross section that is heated the flat row of copper cover aluminum, four limits of general warranty endoporus and the flat row's of copper cover aluminum gap are even, and gap length is 8～20mm; Annealing time and movement velocity that the number of turn of heater coil and length need according to the flat row of copper cover aluminum are determined, to consider to match with the electric parameter of high frequency electric source simultaneously, according to the flat row's of current copper cover aluminum regular size scope, load coil cross section 60mm * 20mm～300mm * 100mm, coil turn 3～50 circles, the frequency of high frequency electric source is 10～60kHz.
Another object of the present invention is to provide a kind of method for annealing that uses the flat row's high-frequency induction of above-mentioned copper cover aluminum Quick annealing device, specifically comprises the following steps:
Step 1: by the flat row of the copper cover aluminum of certain length and cross dimensions successively through vitrified pipe, exit end driving roll 6 and guide roller 7 in the guide roller 2 of inlet end and driving roll 3, high-frequency induction heating coil 8, and by adjust axis that the position of coil makes the flat row of copper cover aluminum as far as possible with the dead in line of load coil, to guarantee the homogeneity of induction heating;
Step 2: start temperature measuring equipment 5 and drive unit 3 and 6, set delivery speed and annealing temperature; Start high-frequency heating power 9 simultaneously, check the states such as water power, guarantee working properly;
Step 3: the heating power that regulates high-frequency heating power, to copper cover aluminum, flat row carries out quick induction heating, when flat row's surface temperature reaches the setting annealing temperature of temperature measuring equipment 5, drive unit drives the flat row of copper cover aluminum to pass through load coil with the delivery speed of setting, and realizes continuous induction annealing.The flat row of copper cover aluminum after heating makes below its temperature fast reducing to 150 ℃ by air blast cooling, then air cooling.
Wherein, the flat row's of described copper cover aluminum annealing temperature is 300～530 ℃; Delivery speed when the flat row of described copper cover aluminum anneals is 50～5000mm/min; The flat row's of described copper cover aluminum cross dimensions is 20mm * 4mm～250mm * 12mm.Its feature is: compare with the annealing process of current pipeline material, adopt higher annealing temperature, shorter annealing time, so that copper-clad coating and aluminium core can complete recrystallize simultaneously fast; Adopt the rear cooling provision fast of insulation, prevented that compound interface layer from continuing diffusion and thickening phenomenon in process of cooling.
The advantage of the flat row's of copper cover aluminum provided by the invention high frequency annealing method is as follows:
(1) adopt induction heating heat-up rate fast, temperature is even; Soaking time is short, and air blast cooling after insulation, and speed of cooling is fast.Therefore, can obtain tiny uniform copper layer and aluminium core recrystallized structure, higher elongation after fracture and conductivity, can effectively control interfacial layer thickness, interface bond strength is higher simultaneously, and the flat row of copper cover aluminum after annealing has good over-all properties;
(2) compare with traditional furnace annealing, Heating Zone Temperature stability is easily controlled, the flat row's of copper cover aluminum microstructure and property homogeneity and high conformity after annealing;
(3) adopt high-frequency induction heating, simple to operate, easily control;
(4) the method applied in the present invention does not need oil, gas fuel, environmentally friendly.
(5) compare with the annealing process of current pipeline material, adopt higher annealing temperature, shorter annealing time, so that copper-clad coating and aluminium core can complete recrystallize simultaneously fast; Adopt the rear cooling provision fast of insulation, prevented that compound interface layer from continuing diffusion and thickening phenomenon in process of cooling.
Accompanying drawing explanation
Fig. 1, Fig. 2 are a kind of high-frequency induction annealing apparatus and method principle schematic for the compound flat row's performance regulation and control of copper cover aluminum of the present invention.
In figure:
| 1. the flat row of copper cover aluminum | 6. drive |
| 2. |
7. |
| 3. drive |
8. quenching |
| 4. vitrified |
9. |
| 5. |
10. high frequency electric source |
Embodiment
Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is described further.
As shown in Figure 1, this device comprises that this device is mainly comprised of guide roller, drive unit, vitrified pipe, temperature measuring equipment, induction heating device and cold wind blower;
Described guide roller comprises charging guide roller and discharging guide roller, be separately positioned on the both sides of induction heating device, every side pair of rolls, guarantees that flat the coming of copper cover aluminum walk continuously broad ways in material process and be not offset, roll gap can be according to the flat row's of copper cover aluminum width adjusting, and regulation range is 0～300mm;
Described drive unit comprises charging drive unit and discharging drive unit, described charging drive unit is arranged on the front end of described charging guide roller, described discharging drive unit is arranged on the rear end of described discharging guide roller, described charging drive unit and discharging drive unit are all by being comprised of driving roll and drive-motor, described driving roll is comprised of the identical pair of rolls up and down of diameter, the roll gap of up-down rollers is that 0～100mm is adjustable, by regulating the flat row's of speed setting copper cover aluminum of drive-motor delivery speed;
Described induction heating device is by high frequency electric source and load coil, for to the flat induction heating that carries out of copper cover aluminum;
Described temperature measuring equipment is comprised of optical fiber infrared temperature sensor and temperature instrumentation, described temperature measuring equipment for to the flat row of copper cover aluminum the surface temperature during by heater coil measure;
Described cold wind blower is arranged on the end of equipment, and this device is comprised of some symmetrically arranged fans, and described induction heating device is for responding to cooling to the flat row of copper cover aluminum;
Described load coil is wrapped on the outer side wall of described vitrified pipe, the cross section of described load coil is rectangle, the number of turn 3～50 circles of described load coil, described load coil is connected with the high frequency electric source arranging outside described heating zone bonnet, described optical fiber infrared temperature sensor is connected with described temperature instrumentation, and described optical fiber infrared temperature sensor is placed in the thermometer hole of central position of described vitrified pipe; Described temperature instrumentation is connected with the drive-motor of described drive unit;
During use, the copper cover aluminum surface temperature of optical fiber infrared temperature sensor measurement shows by temperature instrumentation, when the temperature value of measuring reaches annealing temperature, temperature instrumentation is passed to charging drive unit and discharging drive unit by output terminal by temperature signal, charging drive unit and discharging drive unit start, and make the flat row of copper cover aluminum according to the delivery speed motion of setting.
embodiment 1:cross-sectional dimension is the flat row's of copper cover aluminum of 40mm * 10mm performance regulation and control high-frequency induction annealing method, and flat row's copper layer cladding ratio is 30%.
(1) by length, be 5m and the cross-sectional dimension flat row of copper cover aluminum that is 40mm * 10mm successively through vitrified pipe, exit end driving roll 6 and guide roller 7 in the guide roller 2 of inlet end and driving roll 3, high-frequency induction heating coil 9, and by adjust axis that the position of coil makes the flat row of copper cover aluminum as far as possible with the dead in line of load coil;
(2) start temperature measuring equipment 5 and drive unit 3 and 6, setting delivery speed is that 120mm/min and annealing temperature are 430 ℃; Start high-frequency heating power 10 simultaneously, check the states such as water power, guarantee working properly; Radio-frequency induction coil cross section 70mm * 40mm, coil turn 5; High frequency frequency 50kHz;
(3) regulate the heating power of high-frequency heating power to be adjusted to 25kW, to copper cover aluminum, flat row carries out quick induction heating, when flat row's surface temperature reaches the setting annealing temperature of temperature measuring equipment 5, drive unit drives the flat row of copper cover aluminum to pass through load coil with the delivery speed of setting, and realizes continuous induction annealing.The flat row of copper cover aluminum after heating makes below its temperature fast reducing to 150 ℃ by air-cooled section, then air cooling.
embodiment 2:cross-sectional dimension is the flat row's of copper cover aluminum of 60mm * 10mm performance regulation and control high-frequency induction annealing method, and flat row's copper layer cladding ratio is 30%.
(1) by length, be 6m and the cross-sectional dimension flat row of copper cover aluminum that is 60mm * 10mm successively through vitrified pipe, exit end driving roll 6 and guide roller 7 in the guide roller 2 of inlet end and driving roll 3, high-frequency induction heating coil 9, and by adjust axis that the position of coil makes the flat row of copper cover aluminum as far as possible with the dead in line of load coil;
(2) start temperature measuring equipment 5 and drive unit 3 and 6, setting delivery speed is that 180mm/min and annealing temperature are 460 ℃; Start high-frequency heating power 10 simultaneously, check the states such as water power, guarantee working properly; Radio-frequency induction coil cross section 90mm * 70mm, coil turn 6; High frequency frequency 50kHz;
(3) regulate the heating power of high-frequency heating power to be adjusted to 30kW, to copper cover aluminum, flat row carries out quick induction heating, when flat row's surface temperature reaches the setting annealing temperature of temperature measuring equipment 5, drive unit drives the flat row of copper cover aluminum to pass through load coil with the delivery speed of setting, and realizes continuous induction annealing.The flat row of copper cover aluminum after heating makes below its temperature fast reducing to 150 ℃ by air-cooled section, then air cooling.
Claims (5)
1. for a high-frequency induction annealing device for the compound flat row's performance regulation and control of copper cover aluminum, this device comprises that this device is mainly comprised of guide roller, drive unit, vitrified pipe, temperature measuring equipment, induction heating device and cold wind blower;
Described guide roller comprises charging guide roller and discharging guide roller, be separately positioned on the both sides of induction heating device, every side pair of rolls, guarantees that flat the coming of copper cover aluminum walk continuously broad ways in material process and be not offset, roll gap can be according to the flat row's of copper cover aluminum width adjusting, and regulation range is 0～300mm;
Described drive unit comprises charging drive unit and discharging drive unit, described charging drive unit is arranged on the front end of described charging guide roller, described discharging drive unit is arranged on the rear end of described discharging guide roller, described charging drive unit and discharging drive unit are all by being comprised of driving roll and drive-motor, described driving roll is comprised of the identical pair of rolls up and down of diameter, the roll gap of up-down rollers is that 0～100mm is adjustable, by regulating the flat row's of speed setting copper cover aluminum of drive-motor delivery speed;
Described induction heating device is by high frequency electric source and load coil, for to the flat induction heating that carries out of copper cover aluminum;
Described temperature measuring equipment is comprised of optical fiber infrared temperature sensor and temperature instrumentation, described temperature measuring equipment for to the flat row of copper cover aluminum the surface temperature during by heater coil measure;
Described cold wind blower is arranged on the end of equipment, and this device is comprised of some symmetrically arranged fans, and described induction heating device is for responding to cooling to the flat row of copper cover aluminum;
Described load coil is wrapped on the outer side wall of described vitrified pipe, the cross section of described load coil is rectangle, the number of turn 3～50 circles of described load coil, described load coil is connected with the high frequency electric source arranging outside described heating zone bonnet, described optical fiber infrared temperature sensor is connected with described temperature instrumentation, and described optical fiber infrared temperature sensor is placed in the thermometer hole of central position of described vitrified pipe; Described temperature instrumentation is connected with the drive-motor of described drive unit;
During use, the copper cover aluminum surface temperature of optical fiber infrared temperature sensor measurement shows by temperature instrumentation, when the temperature value of measuring reaches annealing temperature, temperature instrumentation is passed to charging drive unit and discharging drive unit by output terminal by temperature signal, charging drive unit and discharging drive unit start, and make the flat row of copper cover aluminum according to the delivery speed motion of setting.
2. equipment according to claim 1, is characterized in that, described load coil cross-sectional dimension is 60mm * 20mm～300mm * 100mm.
3. equipment according to claim 1, is characterized in that, the frequency of described high frequency electric source is 10～60kHz.
4. equipment according to claim 1, it is characterized in that, described in described vitrified pipe, vitrified pipe adopts the refractory materials of aluminosilicate fiber cotton or asbestos to make, and it is 2～4 times of load coil length that described vitrified pipe inwall and the flat row's of copper cover aluminum outside surface should have vitrified pipe length described in the gap of 3～10mm.
5. use a method for annealing for the flat row's high-frequency induction of copper cover aluminum as claimed in claim 1 Quick annealing device, it is characterized in that, specifically comprise the following steps:
Step 1: the flat row of copper cover aluminum was placed on the liner and drive unit of inlet end;
Step 2: start temperature measuring equipment and drive unit, set delivery speed and annealing temperature; Check the states such as high-frequency heating power water power simultaneously, guarantee working properly;
Step 3: start high-frequency heating power, controlled frequency is 10～60kHz, when in temperature measuring equipment detects the vitrified pipe of load coil, temperature reaches 300～550 ℃, starting drive unit take delivery speed and through vitrified pipe, anneals successively as 50～5000mm/min drives the flat row of copper cover aluminum, by fan air blast cooling, make below its temperature fast reducing to 150 ℃, then air cooling.
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| CN105624594A (en) * | 2016-03-28 | 2016-06-01 | 西安交通大学 | Online heat treatment method for copper-based niobium-titanium superconducting material |
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| CN105624594A (en) * | 2016-03-28 | 2016-06-01 | 西安交通大学 | Online heat treatment method for copper-based niobium-titanium superconducting material |
| CN106111979A (en) * | 2016-08-31 | 2016-11-16 | 广东省钢铁研究所 | A kind of automatic annealing device of magnetically soft alloy powder body decomposed ammonia |
| CN107974651A (en) * | 2017-12-22 | 2018-05-01 | 烟台孚信达双金属股份有限公司 | A kind of online rotary inductive method for annealing of Copper-Aluminum compound pole and equipment |
| CN107974651B (en) * | 2017-12-22 | 2022-09-06 | 烟台孚信达双金属股份有限公司 | Online rotary induction annealing method and equipment for copper-aluminum composite round bar |
| CN108570552A (en) * | 2018-07-05 | 2018-09-25 | 金杯电工电磁线有限公司 | The electromagnetic wire continuous online half hard values control device and method of copper conductor |
| CN109406572A (en) * | 2018-12-10 | 2019-03-01 | 东北大学 | A kind of sheet metal strip transvercal induction heating experimental device and method |
| CN110669919A (en) * | 2019-11-18 | 2020-01-10 | 湖南湘鹤集团电缆科技股份有限公司 | Continuous heating and uninterrupted annealing device for production of vertical shaft cable |
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