CN103695609B - 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 a kind of copper-clad aluminum composite flat row's interfacial layer thickness 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 stratified composite, has the advantage such as low density, low cost, easily connection, can be widely used in the omnibus bar etc. of distribution bus groove, medium-high frequency heating installation, various housing and field of metallurgy and chemical engineering.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, again through post forming complete processings such as rolling, extruding or drawings, produce the product of certain section form and size.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 mechanics and the conductivity of the flat row of copper cover aluminum.In most of application scenario, wish to obtain electric conductivity high as far as possible, and for situations such as needs bending machining, require higher to the elongation after fracture of copper-clad aluminum composite flat row, thus generally need the specific conductivity and the elongation that are improved copper-coated aluminium composite material by isothermal annealing thermal treatment.Annealing region 200 ~ 500 DEG C (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, namely, because copper and aluminium are by interfacial phase mutual diffusion, copper-coated aluminium composite material annealing heat treatment process in when annealing temperature is higher, soaking time is 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: after when between copper/aluminium interface metal, compound layer thickness is greater than 2 μm, the fracture at interface will change brittle rupture into from ductile fracture, interface bond strength significantly reduces (see: 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.).Also show the copper cover aluminum of continuous casting-Rolling Production flat row's electric furnace isothermal annealing result of study, anneal below 250 DEG C, interface bond strength raises with the rising of temperature; 300 DEG C of annealing rear interface places generate intermetallic compounds, and interface bond strength decreases, but now organizes and yet recrystallize does not occur, and elongation is lower, is difficult to meet bending property requirement; When 400 DEG C of annealing are after 1 hour, there is perfect recrystallization in tissue, elongation obviously increases, but interfacial layer thickness reaches more than 4 μm, interface bond strength significantly reduces [to see: Wu Yongfu. rectangle big cross section copper cover aluminum 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 the process annealing of various non-ferrous metal tube, bar and wire rod (for single metal product) or finished products [is shown in: 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 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 the shape of load coil is circular, and transverse section Uniformity of Temperature Field controls easily.Induction continuous annealing has uniform in quality and consistence is good, annealing speed is fast, production efficiency is a little high.Because medium frequency induction power supply equipment easily realizes high-power, be conducive to adopting higher delivery speed when annealing, so the many employings of induction continuous annealing at present heating in medium frequency mode, but heating in medium frequency speed is slower, less on single metal impact, but because the flat row of copper cover aluminum is bimetal stratified composite, the interfacial layer that longer easy formation heat-up time is thicker.In addition, due to copper and aluminium two kinds of melting point metals and recrystallization temperature difference comparatively large, and product is flat wide plate type section, and it is large that transverse section Uniformity of Temperature Field controls difficulty, and heritage answers continuous annealing apparatus and technique, is difficult to the continuous annealing being applied to this series products.
Summary of the invention
The object of the invention is the problems referred to above existed for the isothermal annealing method of existing routine, the flat row of a kind of copper cover aluminum is provided quick induction annealing method, high-frequency induction heating is adopted to carry out fast induction annealing continuously to the flat row of copper cover aluminum, by quick Short Time Heating, the flat row of remarkable shortening copper cover aluminum soaking time at high temperature, the flat row's interfacial layer thickness of copper cover aluminum is effectively suppressed obviously to increase phenomenon, thus make the flat row of the copper cover aluminum after annealing obtain evenly tiny copper aluminium recrystallized structure simultaneously, larger elongation, less interfacial thickness and high interface bond strength, after effective solution annealing, flat row is softening reduces with interface bond strength, the difficult problem that conductivity declines.
In order to reach above object, technical scheme of the present invention is:
The flat row's of a copper cover aluminum high-frequency induction Quick annealing device, this device comprises this device and forms primarily 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, control inerface layer thickness; By load coil being designed to the similar flat pattern of row shape of cross section flat to copper cover aluminum, the uniformity of temperature profile of copper cover aluminum flat row's different sites when not only making induction heating, and improve heating efficiency, be conducive to shortening heat-up time, control inerface layer thickness; By arranging the vitrified pipe of certain length, homogeneous temperature when making heating, ensures that copper-clad coating and aluminium core complete recrystallize simultaneously; By arranging air blast cooling section, making the flat row's temperature after annealing be reduced to less than 150 DEG C fast, preventing copper aluminium interface from occurring again significantly to spread thickening phenomenon in process of cooling, thus be conducive to copper aluminium interfacial layer thickness to control at 2 ~ 3 μm.
Wherein, the Main Function of described guide roller is that flat the coming in continuous annealing process of limit copper alclad does not offset in the width direction, and it is characterized by roller spacing can according to the width adjusting of the flat row of copper cover aluminum; The effect of described drive unit mainly drives the flat row of copper cover aluminum to continue through heater coil with certain speed, and it is characterized by and be made up of driving roll and drive-motor, drive unit can set the delivery speed of the flat row of copper cover aluminum as required; The effect of described vitrified pipe mainly to through being incubated by the flat row of copper cover aluminum heated wherein, preventing flat row's surface radiating too fast, improves the homogeneity of the flat row surface of copper cover aluminum and internal temperature; It is characterized by the refractory materials making that vitrified pipe can adopt thermal conductivity lower; Vitrified pipe is arranged between load coil and the flat row of copper cover aluminum, section form is fixed with the shape of coil and flat row, be generally rectangular pipe, the outside surface of vitrified pipe inwall and the flat row of copper cover aluminum should have the gap of 3 ~ 10mm, to facilitate flat row through wherein, vitrified pipe outer wall and load coil inner hole, be as the criterion with convenient for assembly; Vitrified pipe length is determined according to continuous annealing speed and stitch length, 2 ~ 4 times that generally get stitch length, and the extrusion of general heater coil exit end vitrified pipe is more longer than coil entrance one end; The effect of described temperature measuring equipment is measured by surface temperature during heater coil the flat row of copper cover aluminum, it is characterized in that adopting non-contact infrared measuring apparatus, its temperature-measuring range should between 100 ~ 550 DEG C, temperature measurement location is arranged in the middle part of load coil, and temperature probe extend into the position close to copper cover aluminum surface by the aperture that winding space and vitrified pipe are offered specially; Described induction heating device is made up of high frequency electric source and load coil, effect be by through coil the flat row of copper cover aluminum by electromagnetic induction heating to need temperature and keep the regular hour, realize the regulation and control to microstructure and property; It is characterized in that the shape of cross section of heater coil be to by the similar rectangle of Heated Copper alclad flat row shape of cross section, the hole size of heater coil is determined according to by the shape of cross section of the flat row of Heated Copper alclad, the gap uniformity of four limits of general warranty endoporus and the flat row of copper cover aluminum, gap length is 8 ~ 20mm; The number of turn of heater coil and length are determined according to the annealing time of the flat row's needs of copper cover aluminum and movement velocity, to consider to match with the electric parameter of high frequency electric source simultaneously, according to the regular size scope of the flat row of current copper cover aluminum, load coil cross section 60mm × 20mm ~ 300mm × 100mm, coil turn 3 ~ 50 circle, 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 using above-mentioned copper cover aluminum flat row's high-frequency induction Quick annealing device, specifically comprises the following steps:
Step 1: by the flat row of copper cover aluminum of certain length and cross dimensions successively through vitrified pipe, exit end driving roll 6 and the 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 ensure the homogeneity of induction heating;
Step 2: start temperature measuring equipment 5 and drive unit 3 and 6, setting 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 regulating high-frequency heating power, to copper cover aluminum, flat row carries out quick induction heating, when the surface temperature of flat row 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, realizes continuous induction annealing.The flat row of copper cover aluminum after heating makes its temperature be reduced to less than 150 DEG C fast by air blast cooling, then air cooling.
Wherein, the annealing temperature of the flat row of described copper cover aluminum is 300 ~ 530 DEG C; Delivery speed when the flat row of described copper cover aluminum anneals is 50 ~ 5000mm/min; The cross dimensions of the flat row of described copper cover aluminum is 20mm × 4mm ~ 250mm × 12mm.Its feature is: compared with the annealing process of current pipeline material, adopts higher annealing temperature, shorter annealing time, can complete recrystallize fast to make copper-clad coating and aluminium core simultaneously; Quick cooling provision after adopting insulation, prevents compound interface layer to continue to spread thickening phenomenon in process of cooling.
The advantage of the high frequency annealing method of the flat row of copper cover aluminum provided by the invention is as follows:
(1) adopt induction heating heat-up rate fast, homogeneous temperature; Soaking time is short, and air blast cooling after insulation, speed of cooling is fast.Therefore, layers of copper and aluminium core recrystallized structure, higher elongation after fracture and the conductivity of fine uniform can be obtained, simultaneously can effective control inerface layer thickness, interface bond strength is higher, and the flat row of the copper cover aluminum after annealing has excellent over-all properties;
(2) compared with traditional furnace annealing, Heating Zone Temperature stability easily controls, and microstructure and property homogeneity and the consistence of the rear flat row of copper cover aluminum of annealing are good;
(3) high-frequency induction heating is adopted, simple to operate, easily control;
(4) the method applied in the present invention does not need oil, gas fuel, environmentally friendly.
(5) compared with the annealing process of current pipeline material, adopt higher annealing temperature, shorter annealing time, recrystallize can be completed fast to make copper-clad coating and aluminium core simultaneously; Quick cooling provision after adopting insulation, prevents compound interface layer to continue to spread 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 regulation and control of copper-clad aluminum composite flat row performance of the present invention.
In figure:
| 1. the flat row of copper cover aluminum | 6. drive unit |
| 2. charging guide roller | 7. discharging guide roller |
| 3. drive unit | 8. quenching |
| 4. vitrified pipe | 9. load coil |
| 5. temperature measuring equipment | 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 this device and forms primarily 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, ensure copper cover aluminum flat come to walk continuously in material process do not offset in the width direction, roll gap can according to the width adjusting of the flat row of copper cover aluminum, 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 all form by by driving roll and drive-motor, described driving roll is made up of the pair of rolls up and down that diameter is identical, the roll gap of up-down rollers is that 0 ~ 100mm is adjustable, by regulating the delivery speed of the flat row of speed setting copper cover aluminum of drive-motor;
Described induction heating device by high frequency electric source and load coil, for carrying out induction heating to copper cover aluminum is flat;
Described temperature measuring equipment is made up of optical fiber infrared temperature sensor and temperature instrumentation, and described temperature measuring equipment is used for being measured by surface temperature during heater coil the flat row of copper cover aluminum;
Described cold wind blower is arranged on the end of equipment, and this device is made up of some symmetrically arranged fans, and described induction heating device is used for carrying out induction 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 circle of described load coil, described load coil is connected with the high frequency electric source arranged 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 the 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 is shown by temperature instrumentation, when the temperature value measured reaches annealing temperature, temperature signal is passed to charging drive unit and discharging drive unit by output terminal by temperature instrumentation, 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 performance regulation and control high-frequency induction annealing method of the flat row of copper cover aluminum of 40mm × 10mm, and the layers of copper cladding ratio of flat row is 30%.
(1) the flat row of copper cover aluminum of to be 5m and cross-sectional dimension by length be 40mm × 10mm successively through vitrified pipe, exit end driving roll 6 and the guide roller 7 in the guide roller 2 of inlet end and driving roll 3, high-frequency induction heating coil 9, and makes the axis of the flat row of copper cover aluminum try one's best and the dead in line of load coil by the position of adjustment coil;
(2) start temperature measuring equipment 5 and drive unit 3 and 6, setting delivery speed is 120mm/min and annealing temperature is 430 DEG C; 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; Higher frequency 50kHz;
(3) heating power of high-frequency heating power is regulated to be adjusted to 25kW, to copper cover aluminum, flat row carries out quick induction heating, when the surface temperature of flat row 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, realizes continuous induction annealing.The flat row of copper cover aluminum after heating makes its temperature be reduced to less than 150 DEG C fast by air-cooled section, then air cooling.
embodiment 2:cross-sectional dimension is the performance regulation and control high-frequency induction annealing method of the flat row of copper cover aluminum of 60mm × 10mm, and the layers of copper cladding ratio of flat row is 30%.
(1) the flat row of copper cover aluminum of to be 6m and cross-sectional dimension by length be 60mm × 10mm successively through vitrified pipe, exit end driving roll 6 and the guide roller 7 in the guide roller 2 of inlet end and driving roll 3, high-frequency induction heating coil 9, and makes the axis of the flat row of copper cover aluminum try one's best and the dead in line of load coil by the position of adjustment coil;
(2) start temperature measuring equipment 5 and drive unit 3 and 6, setting delivery speed is 180mm/min and annealing temperature is 460 DEG C; 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; Higher frequency 50kHz;
(3) heating power of high-frequency heating power is regulated to be adjusted to 30kW, to copper cover aluminum, flat row carries out quick induction heating, when the surface temperature of flat row 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, realizes continuous induction annealing.The flat row of copper cover aluminum after heating makes its temperature be reduced to less than 150 DEG C fast by air-cooled section, then air cooling.
Claims (5)
1., for a high-frequency induction annealing device for copper-clad aluminum composite flat row performance regulation and control, this device forms primarily 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, ensure copper cover aluminum flat come to walk continuously in material process do not offset in the width direction, roll gap can according to the width adjusting of the flat row of copper cover aluminum, 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 all form by by driving roll and drive-motor, described driving roll is made up of the pair of rolls up and down that diameter is identical, the roll gap of up-down rollers is that 0 ~ 100mm is adjustable, by regulating the delivery speed of the flat row of speed setting copper cover aluminum of drive-motor;
Described induction heating device by high frequency electric source and load coil, for carrying out induction heating to the flat row of copper cover aluminum;
Described temperature measuring equipment is made up of optical fiber infrared temperature sensor and temperature instrumentation, and described temperature measuring equipment is used for being measured by surface temperature during heater coil the flat row of copper cover aluminum;
Described cold wind blower is arranged on the end of equipment, and this device is made up of some symmetrically arranged fans, and described cold wind blower is used for blowing 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 circle of described load coil, described load coil is connected with the high frequency electric source arranged 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 the central position of described vitrified pipe; Described temperature instrumentation is connected with the drive-motor of described drive unit;
During use, the flat row's surface temperature of copper cover aluminum of optical fiber infrared temperature sensor measurement is shown by temperature instrumentation, when the temperature value measured reaches annealing temperature, temperature signal is passed to charging drive unit and discharging drive unit by output terminal by temperature instrumentation, 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. device according to claim 1, is characterized in that, described load coil cross-sectional dimension is 60mm × 20mm ~ 300mm × 100mm.
3. device according to claim 1, is characterized in that, the frequency of described high frequency electric source is 10 ~ 60kHz.
4. device according to claim 1, it is characterized in that, described vitrified pipe adopts the refractory materials of aluminosilicate fiber cotton or asbestos to make, and the outside surface of described vitrified pipe inwall and the flat row of copper cover aluminum should have the gap of 3 ~ 10mm, and described vitrified pipe length is 2 ~ 4 times of load coil length.
5. use as claimed in claim 1 for a method for annealing for the high-frequency induction annealing device of copper-clad aluminum composite flat row performance regulation and control, it is characterized in that, specifically comprise the following steps:
Step 1: by the flat row of copper cover aluminum of certain length and cross dimensions successively through on the liner of inlet end and drive unit;
Step 2: start temperature measuring equipment and drive unit, setting delivery speed and annealing temperature; Check high-frequency heating power water power state simultaneously, guarantee working properly;
Step 3: start high-frequency heating power, controlled frequency is 10 ~ 60kHz, when in the vitrified pipe that temperature measuring equipment detects load coil, temperature reaches 300 ~ 550 DEG C, starting drive unit with delivery speed is that 50 ~ 5000mm/min drives the flat row of copper cover aluminum to anneal through vitrified pipe successively, its temperature is made to be reduced to less than 150 DEG C fast by fan air blast cooling, then air cooling.
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| CN1396296A (en) * | 2002-07-19 | 2003-02-12 | 中国科学院精密铜管工程研究中心 | Online stress relief treatment method for copper alloy pipe wire and special device |
| CN201358282Y (en) * | 2009-01-16 | 2009-12-09 | 张红中 | High-efficiency and energy-saving annealing furnace |
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