CN114952205A - Production method of microchannel flow-collecting aluminum pipe - Google Patents
Production method of microchannel flow-collecting aluminum pipe Download PDFInfo
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- CN114952205A CN114952205A CN202210819419.4A CN202210819419A CN114952205A CN 114952205 A CN114952205 A CN 114952205A CN 202210819419 A CN202210819419 A CN 202210819419A CN 114952205 A CN114952205 A CN 114952205A
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- Prior art keywords
- pipe
- composite
- core
- production method
- microchannel
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 31
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 239000002131 composite material Substances 0.000 claims abstract description 52
- 238000010622 cold drawing Methods 0.000 claims abstract description 28
- 238000005219 brazing Methods 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 6
- 238000003466 welding Methods 0.000 claims abstract description 6
- 238000005498 polishing Methods 0.000 claims abstract description 5
- 238000000137 annealing Methods 0.000 claims abstract description 4
- 238000005253 cladding Methods 0.000 claims abstract description 4
- 239000011261 inert gas Substances 0.000 claims abstract description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 5
- 238000003754 machining Methods 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 238000007517 polishing process Methods 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 5
- 239000010410 layer Substances 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 2
- 229910001082 7005 aluminium alloy Inorganic materials 0.000 description 1
- 229910001008 7075 aluminium alloy Inorganic materials 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 239000012792 core layer Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a method for producing a microchannel flow-collecting aluminum pipe, which comprises the following steps of firstly extruding an aluminum ingot by a hot extruder to form a core pipe and an outer composite pipe; feeding a plurality of core pipes into a cladding machine at a speed of 10-55 m/min, and simultaneously feeding brazing strips; simultaneously, heating the fed core tube and the brazing strip by adopting an online continuous annealing process until the temperature of the core tube and the brazing strip is close to a molten state, wrapping the brazing strip on the outer surfaces of a plurality of core tubes under the action of a wrapping machine, and welding the butt joints of the brazing strip under the protection of inert gas to obtain a composite core tube; removing an oxide layer on the surface of the composite core pipe, and polishing; continuously carrying out cold drawing and heat treatment on the composite core pipe for at least one time; and finally, nesting the outer composite pipe on the outer wall of the composite core pipe, and performing cold drawing and heat treatment at least once to enable the size of the composite pipe to reach a target value. The invention has stronger corrosion resistance and lower processing cost compared with a multi-layer sleeve cold-drawing mode.
Description
Technical Field
The invention belongs to the technical field of aluminum pipe production, and particularly relates to a production and processing method of a small-pipe-diameter collecting pipe.
Background
The micro-channel collecting pipe is widely applied to air conditioner heat exchangers, has excellent heat transfer characteristics, improves the traditional industrial refrigeration, automobile air conditioners, machine room air conditioners and household air conditioners, effectively improves the energy utilization rate and reduces the emission. At present, most of traditional micro-channel collecting pipes adopt aluminum composite belts, a composite pipe is formed by brazing a core layer material and a micro pipe through multi-pass cold drawing and hot rolling technologies, and butt welding positions formed in the cold rolling pipe coiling process are easy to form welding defects, so that the mechanical property and the corrosion resistance of the collecting pipe are reduced.
Disclosure of Invention
The purpose of the invention is as follows: in view of the existing problems and disadvantages, the present invention provides a method for producing a microchannel current-collecting aluminum tube, which can improve the corrosion resistance and mechanical strength of a current-collecting pipe.
The technical scheme is as follows: in order to realize the purpose, the invention adopts the following technical scheme: a method for producing a microchannel flow-collecting aluminum pipe comprises the following steps:
s1: firstly, extruding an aluminum ingot by a hot extruder to form a core pipe and an outer composite pipe;
s2: feeding a plurality of core pipes into a cladding machine at a speed of 10-55 m/min, and simultaneously feeding brazing strips; simultaneously, heating the fed core tube and the brazing strip by adopting an online continuous annealing process until the temperature of the core tube and the brazing strip is close to a molten state, wrapping the brazing strip on the outer surfaces of a plurality of core tubes under the action of a wrapping machine, and welding the butt joints of the brazing strip under the protection of inert gas to obtain a composite core tube;
s3: removing an oxide layer on the surface of the composite core pipe, and polishing;
s4: continuously carrying out cold drawing and heat treatment on the composite core pipe for at least one time;
s5: and finally, nesting the outer composite pipe on the outer wall of the composite core pipe, and performing cold drawing and heat treatment at least once to enable the size of the composite pipe to reach a target value.
Preferably, the cold drawing and heat treatment in step S4 are specifically performed as follows: after the composite core pipe is subjected to primary cold drawing and heated to be close to a molten state, the cold drawing and the heat treatment are repeated for 1-5 times.
Preferably, in step S4, the composite core tube is subjected to final cold drawing and heat treatment, and the plurality of core tubes are formed into a twisted core tube bundle by using twisted cold drawing.
Preferably, in step S1, the core tube is made of 1, 3 or 5 series aluminum alloy, and the outer composite tube is made of 2 or 7 series aluminum alloy.
Preferably, in the step S1, the diameter of the core tube is 10-80 mm, and the wall thickness is 12-55 mm; the diameter of the outer composite pipe is 20-200 mm, and the wall thickness is 12-100 mm.
Preferably, in step S2, the heating temperature of the core tube and the brazing sheet is 15 to 50 ℃ lower than the melting point thereof.
Preferably, in step S3, after the surface oxide layer is removed from the composite core tube, the composite core tube is polished to have an outer surface roughness of less than 0.025 μm and a surface finish of less than 0.02 μm.
Preferably, in the step S4, cold drawing is carried out by adopting disk drawing or straight drawing, and the section machining rate of each cold drawing is 5-60%; the heat treatment temperature is 300-420 ℃.
Preferably, the outer composite pipe is a spiral inner threaded pipe or a straight-tooth inner threaded pipe.
Has the advantages that: compared with the prior art, the inner core tube bundle of the microchannel is formed by fusing and combining the easy-to-change aluminum alloy brazing strips with a plurality of core tubes, so that the processing and stamping resistance of the composite aluminum tube are improved, and the composite aluminum tube has stronger corrosion resistance; and the processing cost is lower compared with the cold drawing mode of the multilayer sleeve.
Detailed Description
The invention is further illustrated by the following specific examples. It is to be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention, which is to be given the full breadth of the appended claims and any and all equivalent modifications thereof which may occur to those skilled in the art upon reading the present specification.
The microchannel flow-collecting aluminum pipe is formed by combining a plurality of core pipes, brazing sleeves and outer composite pipes and then performing multi-pass cold drawing and heat treatment, wherein the core pipes are preferably processed by 1060 or 3003 aluminum ingots; the outer composite pipe is preferably processed by adopting 2014 or 7005/7075 aluminum ingots, and the production method is specifically described by taking a 65mm outer envelope diameter collecting pipe as an example:
firstly, respectively extruding a core pipe and an outer composite pipe by a horizontal hot extruder;
secondly, feeding a plurality of core pipes into a cladding machine at a speed of 30-40 m/min, simultaneously feeding brazing strips at a synchronous speed, and polishing the outer surface by using a metal brush during feeding; simultaneously, heating the fed core tubes and brazing strips by adopting an online continuous annealing process until the temperature of the core tubes and the brazing strips reaches 350-400 ℃, at the moment, enabling the core tubes and the brazing strips to be close to a molten state, wrapping the brazing strips on the outer surfaces of a plurality of core tubes under the action of a wrapping machine, welding the butt seams of the brazing strips under the protection of inert gas to obtain tube blanks of the composite core tubes, and extruding and tightly combining the tube blanks under the extrusion of a die at the temperature of about 400 ℃;
and thirdly, removing the oxide layer on the surface of the composite core pipe if necessary, and carrying out online polishing treatment, wherein the roughness of the outer surface of the composite core pipe is less than 0.025 mu m and the surface smoothness is less than 0.02 mu m through a polishing process. (ii) a
Fourthly, repeating the cold drawing and the heat treatment of the composite core pipe for 1 to 5 times; in the process, cold drawing is preferably carried out by adopting disc drawing or straight drawing, and the machining rate of the cold-drawn section of each pass is 5-60%; preferably, the composite core pipe is twisted when the cold drawing machine rotates during the last cold drawing, and the heat dissipation efficiency of the collecting pipe can be effectively improved by increasing the contact area;
and fifthly, finally, nesting the outer composite pipe on the outer wall of the composite core pipe, and performing cold drawing and heat treatment at least once to enable the size of the composite pipe to reach a target value. Compared with the traditional commercially available aluminum composite aluminum belt or aluminum pipe, the cost is very high, the aluminum composite aluminum belt or aluminum pipe is directly coated and welded by the aluminum ingot and the aluminum strip and then is extruded and molded, the cost is greatly reduced, and the heat dissipation efficiency, the mechanical strength and the corrosion resistance of the collecting pipe are improved.
Claims (9)
1. The production method of the microchannel flow-collecting aluminum pipe is characterized by comprising the following steps of:
s1: firstly, extruding an aluminum ingot through a hot extruder to form a core pipe and an outer composite pipe;
s2: feeding a plurality of core pipes into a cladding machine at a speed of 10-55 m/min, and simultaneously feeding brazing strips; simultaneously, heating the fed core tube and the brazing strip by adopting an online continuous annealing process until the temperature of the core tube and the brazing strip is close to a molten state, wrapping the brazing strip on the outer surfaces of a plurality of core tubes under the action of a wrapping machine, and welding the butt joints of the brazing strip under the protection of inert gas to obtain a composite core tube;
s3: removing an oxide layer on the surface of the composite core pipe, and polishing;
s4: continuously carrying out cold drawing and heat treatment on the composite core pipe for at least one time;
s5: and finally, nesting the outer composite pipe on the outer wall of the composite core pipe, and performing cold drawing and heat treatment at least once to enable the size of the composite pipe to reach a target value.
2. The production method of a microchannel current-collecting aluminum pipe as recited in claim 1, wherein: the cold drawing and heat treatment in step S4 are specifically performed as follows: after the composite core pipe is subjected to primary cold drawing and heated to be close to a molten state, the cold drawing and the heat treatment are repeated for 1-5 times.
3. The production method of a microchannel current-collecting aluminum pipe as recited in claim 2, wherein: and in the step S4, the composite core pipe adopts the torsional cold drawing to form a torsional core pipe bundle by a plurality of core pipes when the last cold drawing and the heat treatment are carried out.
4. The production method of a microchannel current-collecting aluminum pipe as recited in claim 2, wherein: in the step S1, the core pipe is made of 1, 3 or 5 series aluminum alloy, and the outer composite pipe is made of 2 or 7 series aluminum alloy.
5. The production method of the microchannel current-collecting aluminum pipe as recited in claim 4, wherein: in the step S1, the diameter of the core tube is 10-80 mm, and the wall thickness is 12-55 mm; the diameter of the outer composite pipe is 20-200 mm, and the wall thickness is 12-100 mm.
6. The production method of the microchannel current-collecting aluminum pipe as recited in claim 4, wherein: in step S2, the heating temperature of the core tube and the brazing strip is 15-50 ℃ lower than the melting point of the core tube and the brazing strip.
7. The production method of the microchannel current-collecting aluminum pipe as recited in claim 4, wherein: in step S3, after the surface oxide layer is removed from the composite core tube, the roughness of the outer surface of the composite core tube is less than 0.025 μm and the surface smoothness is less than 0.02 μm by a polishing process.
8. The production method of the microchannel current-collecting aluminum pipe as recited in claim 4, wherein: step S4, cold drawing is carried out by adopting disk drawing or straight drawing, and the machining rate of the cold-drawn section of each pass is 5-60%; the heat treatment temperature is 300-420 ℃.
9. The production method of the microchannel current-collecting aluminum pipe as recited in claim 4, wherein: the outer composite pipe adopts a spiral inner threaded pipe or a straight-tooth inner threaded pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210819419.4A CN114952205A (en) | 2022-07-13 | 2022-07-13 | Production method of microchannel flow-collecting aluminum pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210819419.4A CN114952205A (en) | 2022-07-13 | 2022-07-13 | Production method of microchannel flow-collecting aluminum pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114952205A true CN114952205A (en) | 2022-08-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210819419.4A Pending CN114952205A (en) | 2022-07-13 | 2022-07-13 | Production method of microchannel flow-collecting aluminum pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114952205A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6050301A (en) * | 1997-07-23 | 2000-04-18 | The Furukawa Electric Co., Ltd. | Al alloy composite tube for refrigerant passages and method for producing the same |
| CN1843646A (en) * | 2006-04-24 | 2006-10-11 | 江苏兴荣高新科技股份有限公司 | Method for manufacturing copper aluminium composite tubing and copper aluminium tubing produced thereby |
| CN102134669A (en) * | 2011-01-04 | 2011-07-27 | 潍坊三源铝业有限公司 | Collecting pipe material for micro-channel heat exchanger and preparation method thereof |
| CN102445105A (en) * | 2011-11-15 | 2012-05-09 | 江苏格林威尔金属材料科技有限公司 | Alloy abnormal shaped flow collection pipe for heat exchanger and manufacture method of same |
| CN106563931A (en) * | 2016-10-27 | 2017-04-19 | 杜益冕 | Production method of collecting pipe |
| CN106584043A (en) * | 2016-10-27 | 2017-04-26 | 杜益冕 | Production method for wrapping-type flow collecting pipe |
| 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 |
| CN107709613A (en) * | 2015-06-23 | 2018-02-16 | 日本发条株式会社 | The manufacture method of multiple tube and multiple tube |
| CN108080436A (en) * | 2017-11-13 | 2018-05-29 | 安徽天潭金属材料有限公司 | A kind of production method of new-type compound aluminum tube |
-
2022
- 2022-07-13 CN CN202210819419.4A patent/CN114952205A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6050301A (en) * | 1997-07-23 | 2000-04-18 | The Furukawa Electric Co., Ltd. | Al alloy composite tube for refrigerant passages and method for producing the same |
| CN1843646A (en) * | 2006-04-24 | 2006-10-11 | 江苏兴荣高新科技股份有限公司 | Method for manufacturing copper aluminium composite tubing and copper aluminium tubing produced thereby |
| CN102134669A (en) * | 2011-01-04 | 2011-07-27 | 潍坊三源铝业有限公司 | Collecting pipe material for micro-channel heat exchanger and preparation method thereof |
| CN102445105A (en) * | 2011-11-15 | 2012-05-09 | 江苏格林威尔金属材料科技有限公司 | Alloy abnormal shaped flow collection pipe for heat exchanger and manufacture method of same |
| CN107709613A (en) * | 2015-06-23 | 2018-02-16 | 日本发条株式会社 | The manufacture method of multiple tube and multiple tube |
| CN106563931A (en) * | 2016-10-27 | 2017-04-19 | 杜益冕 | Production method of collecting pipe |
| CN106584043A (en) * | 2016-10-27 | 2017-04-26 | 杜益冕 | Production method for wrapping-type flow collecting pipe |
| 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 |
| CN108080436A (en) * | 2017-11-13 | 2018-05-29 | 安徽天潭金属材料有限公司 | A kind of production method of new-type compound aluminum tube |
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