CN102527768A - Manufacturing method of copper-clad aluminum pipe - Google Patents
Manufacturing method of copper-clad aluminum pipe Download PDFInfo
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- CN102527768A CN102527768A CN2010105789650A CN201010578965A CN102527768A CN 102527768 A CN102527768 A CN 102527768A CN 2010105789650 A CN2010105789650 A CN 2010105789650A CN 201010578965 A CN201010578965 A CN 201010578965A CN 102527768 A CN102527768 A CN 102527768A
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Abstract
The invention relates to a manufacturing method of a copper aluminium clad pipe, and especially relates to a manufacturing method of a copper-clad aluminum pipe, and the method comprises the following steps: step one, cleaning an external surface of a substrate aluminium pipe, a cladding copper strip, and a contact surface of the substrate aluminium pipe; step two, performing cladding and molding of the substrate aluminium pipe by the cladding copper strip, and welding the copper strip after pipe molding; step three, performing multi-channel straight line drawing to allow the internal surface of the copper pipe and the adhered aluminium to diffuse mutually at a faying surface so as to form a copper aluminium metallurgical bonding layer; step four, performing instantaneous induction heating by an induction coil at a induction heating temperature of 200 DEG C-540 DEG C, then immediately performing water cooling, wherein the copper aluminium metallurgical bonding layer is reinforced by the instantaneous high temperature, the aluminium uniformly adhered on the internal surface of the copper pipe and the substrate aluminium pipe are welded together through the instantaneous high temperature, thus aluminium aluminium welding is realized, and the copper-clad aluminum pipe product is manufactured. The method of the invention is reasonable in process, and low in manufacturing cost; the manufactured product is good in quality, and aluminium aluminium welding is realized.
Description
Technical field
The present invention relates to a kind of manufacturing approach of copper aluminum composite pipes, particularly a kind of manufacturing approach of copper cladding aluminium pipe the invention belongs to metal pipe material processing and manufacturing technical field.
Background technology
Fine copper and copper alloy tube performance are very good, but but exist the problem of cost height and resource-constrained, therefore have only the copper aluminum composite pipes of fine copper and copper alloy tube cost 1/3 to be used more and more at present, substitute fine copper and copper alloy tube.Copper aluminum composite pipes has four kinds of patterns.First kind of copper aluminum composite pipes that is middle for copper layer, inside and outside composite layer of aluminum; Second kind is that inner face is the copper aluminum composite pipes of aluminium lamination, outer surface complex copper layer, i.e. copper cladding aluminium pipe; The third is the copper aluminum composite pipes of outside for aluminium lamination, inner surface complex copper layer, i.e. aluminum-cladding copper pipe, and the 4th kind is the copper aluminum composite pipes of aluminium lamination, inside and outside complex copper layer in the middle of being.In these four kinds of copper aluminum composite pipes; Second kind of copper cladding aluminium pipe can be used as air conditioner piping, tube connector, elbow etc.; The inner wire that also can be used as radio-frequency cable, when being used as inner wire, the copper of copper cladding aluminium pipe outer surface has good electrical conductivity; The Kelvin effect of high-frequency signal can guarantee that signal transmits in the copper layer of outer surface, the aluminum pipe of inwall only plays support.This copper cladding aluminium pipe is in light weight, the cost of material is low, and corrosion resistance, thermal conductivity and mechanical performance etc. are very good, are desirable fine copper and copper alloy tube substitute products, thereby also are a kind of copper aluminum composite pipes that is widely used at present.To meet the requirements of the copper cladding aluminium pipe difficulty very big but produce, and this is that fusing point is 1083 ℃ because the proportion of copper is 8.9; The proportion of aluminium is 2.7; Fusing point is 660 ℃, though two kinds of metals of copper aluminium are the good conductor of heat and electricity, the two mechanical performance gap of copper aluminium is very big.Compare with aluminium, the tensile strength of copper and percentage elongation are high, plasticity is good.Therefore, the gap of these two kinds of above performances of metal makes the composite pipe of these two kinds of metals of processing that very big difficulty arranged during fabrication, and especially processing makes these two kinds of metals on the interface, reach the manufacturing approach of the copper aluminum composite pipes of metallurgical binding, and difficulty is bigger.The metallurgical binding at copper aluminum composite pipes interface is extremely important; Because in use will carry out bend pipe, enlarging and following process such as the pipe that rises to tubing, the interface that the copper metallurgy of aluminium combines can guarantee in this use process, can not produce the disengaging and the breakage at copper aluminium interface.In addition, the copper aluminum composite pipes that does not reach metallurgical binding can produce the phenomenon of bubbling in annealing process, and this phenomenon also is the disengaging at a kind of copper aluminium interface, and the disengaging at any copper aluminium interface all can influence the quality of product, all can produce serious quality accident.
In the prior art; Application number is 200610076037.8, open day was that October 11, publication number in 2006 are that CN1843646A, name are called the " Chinese patent of the copper aluminium composite tubing that a kind of manufacturing approach of copper aluminium composite tubing and this method are made; A kind of manufacturing approach of manufactured copper aluminium compound copper pipe is disclosed; Promptly adopt the planetary rolling machine that the aluminum-cladding copper pipe base of handling well is in advance carried out the rolling of heavy reduction, the contraction percentage of area of single pass is 50%～95%, in the operation of rolling; The temperature of deformed area rises to 200 ℃～600 ℃; This method can realize the metallurgical binding between the copper aluminium, again through after the processing such as stretching of passage, finally can produce and have metallurgical binding, satisfactory aluminum-cladding copper pipe.This method is utilized the characteristic of planetary rolling single pass heavy reduction, can a time make copper aluminium interface reach metallurgical binding.But this manufacturing approach but exists following major defect: owing to adopt complicated planetary rolling technology, technical difficulty is quite big, and complex equipments, and cost is high; Simultaneously, because the characteristic of planetary rolling, can't rolling overlength pipe, can't make king-sized monovolume weight.For example, prior art generally only can reach about the 50kg/ volume, and low monovolume weight greatly reduces the efficient of back passes of drawing, has also reduced the lumber recovery of product simultaneously, unstable product quality, and this has also caused the increase of manufacturing cost; In addition, this method generally only is suitable for producing aluminum-cladding copper pipe.
In the prior art; Application number is 200710110417.3, open day was that November 14, publication number in 2007 are that CN101071662A, name are called the Chinese patent of " copper-clad aluminum conductor, copper cladding aluminium pipe production process and equipment thereof "; The production technology of a kind of copper-clad aluminum conductor, copper cladding aluminium pipe is disclosed; Promptly adopt the method for clad welded,, simultaneously the copper cladding aluminium pipe that coats is carried out online induction annealing through aluminum pipe and the moulding of copper strips clad welded after the removing surface; Again through after the stretching of passage, can produce copper-clad aluminum conductor and copper cladding aluminium pipe.This manufacturing approach is to adopt the method moulding copper cladding aluminium pipe of clad welded, and does the stretching of online at random annealing and back passage, but this manufacturing approach exists following major defect: because the method single pass drafts that stretches is limited; Cause faying face insecure, and traditional dish draws that to make tubing be under the situation that receives very big pulling force, to be wound on the disk body, this stressed coiling can make copper aluminium faying face that the trend that moves is each other arranged; Thereby reduced the bond strength of copper aluminium; And this patent adopts, and elder generation anneals, the processing step of after-drawing, and technology is unreasonable, has intrinsic defective; Because copper aluminum composite pipes can not produce very big sclerosis in the clad welded step; Real sclerosis is to produce later in drawing, adopts the annealing before of stretching passage, and tubing is not had good annealing softening effect.Defectives such as therefore this manufacturing approach makes that copper cladding aluminium pipe exists that copper aluminium faying face is insecure, bond strength is low, poor product quality, technology are unreasonable.
At present; Find the manufacturing approach of the copper aluminum composite pipes that technological process is short, equipment investment is few, metallurgical binding is firm under the situation that process equipment is simplified; Become those skilled in the art's research direction; Also become insoluble always technical barrier, people urgently hope to address this problem to satisfy the great demand to the copper cladding aluminium pipe market of high-quality, high performance-price ratio.
Summary of the invention
The objective of the invention is the deficiency to prior art, provide low cost of manufacture, technology rationally, the quality that manufactures a product is good, the manufacturing approach that can realize a kind of novel copper cladding aluminium pipe of aluminium aluminium welding.
The technical scheme that realizes above-mentioned purpose is: a kind of manufacturing approach of copper cladding aluminium pipe, said method are made the step of copper cladding aluminium pipe and are gathered as follows:
The first step is cleared up the contact-making surface of outer surface, cladding copper strip and the matrix aluminum pipe of matrix aluminum pipe, makes the outer surface of matrix aluminum pipe and the contact-making surface of cladding copper strip and matrix aluminum pipe all expose fresh metal surface;
Second step, with cladding copper strip the matrix aluminum pipe is carried out Overmoldedly, and the copper strips of pipe after the moulding welded, make the copper-clad aluminium composite tube base;
The 3rd step, the last copper-clad aluminium composite tube base that makes of step is carried out the multi-pass straight line stretch, make the aluminium that evenly is stained with on the copper pipe inner surface on the matrix aluminum pipe, aluminium counterdiffusion mutually of copper pipe inner surface and adhesion, formation copper metallurgy of aluminium binder course at the faying face place;
The 4th step, carry out instantaneous eddy-current heating through induction coil, induction heating temperature is 200 ℃～540 ℃; Water-cooled immediately then, TRANSIENT HIGH TEMPERATURE is strengthened copper metallurgy of aluminium binder course, and TRANSIENT HIGH TEMPERATURE is with the aluminium that evenly adheres on the copper pipe inner surface and the seam of matrix aluminum pipe together simultaneously; Realize the welding of aluminium aluminium; Making the aluminium and the matrix aluminum pipe that adhere on the copper pipe inner surface form aluminium metallurgy of aluminium binder course at the faying face place, is that metallic bond combines between atom between the aluminium aluminium, makes the copper cladding aluminium pipe product.
Further, the method for cleaning of metallic brush brush mill is adopted in the cleaning described in the first step.
Further, the method for argon arc welding is adopted in the welding described in second step.
Further, the multi-pass straight line that the multi-pass straight line described in the 3rd step is stretched as the separate unit drawbench stretches, and perhaps is that the series connection straight line of many drawbench stretches.
Further, the eddy-current heating time described in the 4th step is less than 1 second.
Further, the induction heating temperature described in the 4th step is 400 ℃～540 ℃.
Adopt the benefit of technique scheme to be: (1) technology is reasonable, low cost of manufacture.The present invention adopts the multi-pass straight line to stretch, and forms copper metallurgy of aluminium binder course, and adopts induction welding method that aluminium aluminium is combined; The multi-pass of having avoided the traditional handicraft method to make copper cladding aluminium pipe stretches, and technology is reasonable, makes simplified equipment; Equipment investment is few, and processing step is few, and technological process is short; Production efficiency is high, low cost of manufacture; (2) quality that manufactures a product is good, can realize the welding of aluminium aluminium.The present invention allows the passage lengthening coefficient big owing to adopt straight line to stretch, and makes can adhere to uniform aluminium rapidly on the copper side on the copper aluminium contact-making surface, has effectively promoted combining closely of copper aluminium faying face, and it is very solid and reliable that the copper metallurgy of aluminium is combined, and bond strength is high.What is more important the present invention is through eddy-current heating, makes aluminium and matrix aluminum pipe on the copper under the high temperature of eddy-current heating, diffuses to form metallic bond combination between solid and reliable atom between the fresh metal surface generation copper aluminium that it compresses each other each other; Two kinds of materials of aluminium that adheres on the copper of the present invention and matrix aluminum pipe are identical, are fine aluminium or are aluminium alloy, and two kinds of identical materials combine easily; Bond quality is good; Through eddy-current heating, realized the welding of aluminium aluminium, bond strength is high.Can make high-quality, incorporate copper cladding aluminium pipe through the inventive method.Therefore the copper cladding aluminium pipe that adopts the inventive method to make, the copper aluminium metallurgical interface bond quality between copper and the aluminium is very good, and copper aluminium faying face is solid and reliable, and mechanical performances etc. are very good, good product quality, cost performance is high.The copper cladding aluminium pipe product of the inventive method manufacturing can satisfy in use tubing is carried out bend pipe, enlarging and following process requirement such as the pipe that rises fully, and the interface of high-quality copper metallurgy of aluminium combination has guaranteed can not produce in the process such as follow-up the disengaging, breakage at copper aluminium interface, the generation of phenomenon such as mobile; (3) manufacturing scope is wide, has realized the manufacturing of big specification and overlength copper cladding aluminium pipe.The present invention not only can make the copper cladding aluminium pipe of little caliber owing to adopt straight line to stretch, and all right processing and manufacturing caliber has been realized the manufacturing of large size copper alclad pipe greater than the copper cladding aluminium pipe of φ 100mm; The inventive method can produce the copper cladding aluminium pipe of single tubing overlength simultaneously, has realized the manufacturing of overlength copper gadolinium aluminum pipe; (4) in light weight.Unit weight only is about 43% of copper pipe, and is in light weight, waits for the transportation installation and brings great convenience.
Manufacturing approach craft of the present invention is reasonable, simple, low cost of manufacture, and copper metallurgy of aluminium faying face is good; Aluminium metallurgy of aluminium faying face is solid and reliable, and bond strength is high, and performance is good; Good product quality, the copper cladding aluminium pipe of the inventive method manufacturing have not only solved the insurmountable always technical barrier of people, and have satisfied the great demand of people to the copper cladding aluminium pipe market of high-quality, high performance-price ratio; Can substitute existing fine copper and copper alloy tube fully, be the desirable substitute products of fine copper and copper alloy tube.
The specific embodiment
Below in conjunction with embodiment the present invention is done further detailed explanation.
Embodiment one
A kind of manufacturing approach of copper cladding aluminium pipe, said method are made the copper cladding aluminium pipe step and are gathered as follows:
The first step adopts the 3003 extruded aluminium coil pipes of Ф 30mm * 2mm as the interior pipe of matrix aluminum pipe, the heavy 600kg of single volume, and it is the copper belt of 0.45mm that cladding copper strip is selected thickness for use.Adopt the method for cleaning of metallic brush brush mill to clear up the outer surface of matrix aluminum pipe; Also need to adopt the method for cleaning of metallic brush brush mill to clear up the contact-making surface of cladding copper strip and matrix aluminum pipe, make the outer surface of matrix aluminum pipe and the contact-making surface of cladding copper strip and matrix aluminum pipe all expose fresh metal surface;
Second step, with cladding copper strip the matrix aluminum pipe is carried out Overmolded, the Overmolded method of the conventional welded tube unit of Overmolded employing, and the copper strips of pipe after the moulding carried out the argon arc welding, i.e. TIG welding makes the copper-clad aluminium composite tube base;
The 3rd step; The copper-clad aluminium composite tube base that a last step is made adopts the separate unit drawbench to carry out the stretching of multi-pass straight line; Make the aluminium that evenly is stained with on the copper pipe inner surface on the matrix aluminum pipe, aluminium counterdiffusion mutually at the faying face place of copper pipe inner surface and adhesion forms copper metallurgy of aluminium binder course; The straight line drawing is carried out at normal temperatures, is drawn to 15.88 mm * 1mm through the continuous straight line of 5 passages;
The 4th step, carry out instantaneous eddy-current heating through induction coil, the eddy-current heating time was 0.5 second; Induction heating temperature is 300 ℃～540 ℃, water-cooled immediately then, and TRANSIENT HIGH TEMPERATURE is strengthened copper metallurgy of aluminium binder course; The copper metallurgy of aluminium is combined firmly; TRANSIENT HIGH TEMPERATURE realizes the welding of aluminium aluminium with even aluminium that adheres to and the seam of matrix aluminum pipe on the copper pipe inner surface together simultaneously, makes the aluminium and the matrix aluminum pipe that adhere on the copper pipe inner surface form aluminium metallurgy of aluminium binder course at the faying face place; Be that metallic bond combines between atom between the aluminium aluminium, make the copper cladding aluminium pipe product.
Embodiment two
A kind of manufacturing approach of copper cladding aluminium pipe, said method are made the copper cladding aluminium pipe step and are gathered as follows:
The first step adopts the fine aluminium extruded tube of Ф 100mm * 5mm as the interior pipe of matrix aluminum pipe, and it is the copper belt of 0.5mm that cladding copper strip is selected thickness for use.Adopt the method for cleaning of metallic brush brush mill to clear up the outer surface of matrix aluminum pipe; Also need to adopt the method for cleaning of metallic brush brush mill to clear up the contact-making surface of cladding copper strip and matrix aluminum pipe, make the outer surface of matrix aluminum pipe and the contact-making surface of cladding copper strip and matrix aluminum pipe all expose fresh metal surface;
Second step, with cladding copper strip the matrix aluminum pipe is carried out Overmoldedly, Overmolded employing copper strips was pulled the simple and easy forming method of circle mould, and the copper strips of pipe after the moulding carried out the argon arc welding, i.e. and TIG welding makes the copper-clad aluminium composite tube base;
The 3rd step; The copper-clad aluminium composite tube base that a last step is made adopts the series connection of 4 drawbench to carry out the stretching of multi-pass straight line; Make the aluminium that evenly is stained with on the copper pipe inner surface on the matrix aluminum pipe, aluminium counterdiffusion mutually at the faying face place of copper pipe inner surface and adhesion forms copper metallurgy of aluminium binder course; The straight line drawing is carried out at normal temperatures, is drawn to 80 mm * 3mm through the continuous straight line of 4 passages;
The 4th step, carry out instantaneous eddy-current heating through induction coil, the eddy-current heating time was 0.7 second; Induction heating temperature is 200 ℃～400 ℃, water-cooled immediately then, and TRANSIENT HIGH TEMPERATURE is strengthened copper metallurgy of aluminium binder course; The copper metallurgy of aluminium is combined firmly; TRANSIENT HIGH TEMPERATURE realizes the welding of aluminium aluminium with even aluminium that adheres to and the seam of matrix aluminum pipe on the copper pipe inner surface together simultaneously, makes the aluminium and the matrix aluminum pipe that adhere on the copper pipe inner surface form aluminium metallurgy of aluminium binder course at the faying face place; Be that metallic bond combines between atom between the aluminium aluminium, make the copper cladding aluminium pipe product.
Embodiment three
Present embodiment and embodiment one are basic identical, and said method is made the copper cladding aluminium pipe step and differently in gathering is:
In the 3rd step, be to adopt the series connection of 5 drawbench to carry out the multi-pass straight line copper-clad aluminium composite tube base that second step made to stretch, be drawn to 15.88 mm * 1mm through the continuous straight line of 5 passages;
In the 4th step, the eddy-current heating time of carrying out instantaneous eddy-current heating through induction coil was 0.9 second, and induction heating temperature is 200 ℃～300 ℃.
Embodiment four
Present embodiment and embodiment two are basic identical, and said method is made the copper cladding aluminium pipe step and differently in gathering is:
In the 3rd step, be to adopt the separate unit drawbench to carry out the multi-pass straight line copper-clad aluminium composite tube base that second step made to stretch, be drawn to 80 mm * 3mm through the continuous straight line of 4 passages;
In the 4th step, the eddy-current heating time of carrying out instantaneous eddy-current heating through induction coil was 0.3 second, and induction heating temperature is 400 ℃～540 ℃.
Embodiment five
Present embodiment and embodiment one are basic identical, and said method is made the copper cladding aluminium pipe step and differently in gathering is:
In the 4th step, the eddy-current heating time of carrying out instantaneous eddy-current heating through induction coil was 0.6 second, and induction heating temperature is 300 ℃～400 ℃.
Embodiment six
Present embodiment and embodiment two are basic identical, and said method is made the copper cladding aluminium pipe step and differently in gathering is:
In the 4th step, the eddy-current heating time of carrying out instantaneous eddy-current heating through induction coil was 0.8 second, and induction heating temperature is 250 ℃～350 ℃.
Except that the foregoing description, the copper cladding aluminium pipe scope of application that the present invention makes is very wide, is not limited to the specification in the foregoing description.The argon arc welding best results is adopted in welding in second step of the present invention.When the present invention carries out the stretching of multi-pass straight line in the 3rd step; Can select how many passages to carry out straight line with as required and stretch, the straight line drawing is carried out at normal temperatures, can be the repeatedly drawing of separate unit vertical pulling machine; It also can be the continuous straight line drawing of the multi-pass of many straight line drawbench series connection formations; Copper cladding aluminium pipe can produce certain deformation heat through drawing die the time, this heat helps the phase counterdiffusion between copper aluminium, helps on copper strips, to adhere to uniform aluminium lamination; During the continuous straight line drawing of multi-pass, this heat can produce additive effect.In the 4th step, owing at high temperature can generate metallic compound CuAl between copper aluminium between copper aluminium
2Therefore heating-up temperature can not be above 548 ℃; Realize welding but be lower than between 200 ℃ of aluminium and aluminum pipes that can not make again on the copper strips, therefore induction heating temperature is set to 200 ℃～540 ℃ in the 4th step, except that the foregoing description; Induction heating temperature also can be selected other numerical value of 200 ℃～540 ℃ for use, and when induction heating temperature is 400 ℃～540 ℃, is the best.Eddy-current heating requires instantaneous completion, cooling immediately then, otherwise just possibly generate the metallic compound of fragility between copper aluminium, eddy-current heating was accomplished best results in 1 second.Base aluminum tubing matter described in the present invention is fine aluminium or aluminium alloy, and the cladding copper strip material is fine copper or copper alloy.
The invention is not restricted to the foregoing description, all employings are equal to technical scheme that replacement or equivalence replacement form and all belong to the present invention and require the scope protected.
Claims (6)
1. the manufacturing approach of a copper cladding aluminium pipe is characterized in that said method makes the step of copper cladding aluminium pipe and gather as follows:
The first step is cleared up the contact-making surface of outer surface, cladding copper strip and the matrix aluminum pipe of matrix aluminum pipe, makes the outer surface of matrix aluminum pipe and the contact-making surface of cladding copper strip and matrix aluminum pipe all expose fresh metal surface;
Second step, with cladding copper strip the matrix aluminum pipe is carried out Overmoldedly, and the copper strips of pipe after the moulding welded, make the copper-clad aluminium composite tube base;
The 3rd step, the last copper-clad aluminium composite tube base that makes of step is carried out the multi-pass straight line stretch, make the aluminium that evenly is stained with on the copper pipe inner surface on the matrix aluminum pipe, aluminium counterdiffusion mutually of copper pipe inner surface and adhesion, formation copper metallurgy of aluminium binder course at the faying face place;
The 4th step, carry out instantaneous eddy-current heating through induction coil, induction heating temperature is 200 ℃～540 ℃; Water-cooled immediately then, TRANSIENT HIGH TEMPERATURE is strengthened copper metallurgy of aluminium binder course, and TRANSIENT HIGH TEMPERATURE is with the aluminium that evenly adheres on the copper pipe inner surface and the seam of matrix aluminum pipe together simultaneously; Realize the welding of aluminium aluminium; Making the aluminium and the matrix aluminum pipe that adhere on the copper pipe inner surface form aluminium metallurgy of aluminium binder course at the faying face place, is that metallic bond combines between atom between the aluminium aluminium, makes the copper cladding aluminium pipe product.
2. the manufacturing approach of a kind of copper cladding aluminium pipe according to claim 1 is characterized in that: the method for cleaning that the cleaning described in the first step adopts the metallic brush brush to grind.
3. the manufacturing approach of a kind of copper cladding aluminium pipe according to claim 1 is characterized in that: the method that the welding described in second step adopts argon arc to weld.
4. the manufacturing approach of a kind of copper cladding aluminium pipe according to claim 1 is characterized in that: the multi-pass straight line that the multi-pass straight line described in the 3rd step is stretched as the separate unit drawbench stretches, and perhaps be the series connection straight line stretching of many drawbench.
5. the manufacturing approach of a kind of copper cladding aluminium pipe according to claim 1 is characterized in that: the eddy-current heating time described in the 4th step is less than 1 second.
6. the manufacturing approach of a kind of copper cladding aluminium pipe according to claim 1 is characterized in that: the induction heating temperature described in the 4th step is 400 ℃～540 ℃.
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| CN103021561A (en) * | 2012-11-28 | 2013-04-03 | 大连通发新材料开发有限公司 | Induction heating preparation process for copper-clad aluminum bus blank |
| CN104138925A (en) * | 2014-06-18 | 2014-11-12 | 谢光玉 | Method for preparing copper/phosphorus double-metal capillary tube |
| CN104376897A (en) * | 2014-11-17 | 2015-02-25 | 中国科学技术大学 | Hollow copper-clad aluminum conductor and production method thereof |
| CN104842079A (en) * | 2014-02-19 | 2015-08-19 | 李亚臣 | Cable bus opening heating ring and application thereof in cable bus copper pipe welding |
| CN105097064A (en) * | 2015-07-10 | 2015-11-25 | 贵州塑力线缆有限公司 | Novel creep-resistant high-conductivity superfine copper-coated aluminum alloy bi-metallic conductor SD |
| CN105750355A (en) * | 2016-04-02 | 2016-07-13 | 罗奕兵 | Method for preparing copper-cladding aluminum compound microwire |
| CN106238502A (en) * | 2016-07-29 | 2016-12-21 | 新昌县长城空调部件有限公司 | Air conditioning for automobiles pipe assembly manufacturing process |
| CN107262550A (en) * | 2017-06-21 | 2017-10-20 | 江苏兴荣高新科技股份有限公司 | A kind of manufacture method of aluminium aluminium composite pipe |
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| CN107262550B (en) * | 2017-06-21 | 2019-07-26 | 江苏兴荣高新科技股份有限公司 | A kind of manufacturing method of aluminium aluminium composite pipe |
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Application publication date: 20120704 |