CN101255933A - Double-layer winding-soldering pipe production technology for connection of indoor/outdoor unit of air conditioner - Google Patents
Double-layer winding-soldering pipe production technology for connection of indoor/outdoor unit of air conditioner Download PDFInfo
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- CN101255933A CN101255933A CNA2008100177701A CN200810017770A CN101255933A CN 101255933 A CN101255933 A CN 101255933A CN A2008100177701 A CNA2008100177701 A CN A2008100177701A CN 200810017770 A CN200810017770 A CN 200810017770A CN 101255933 A CN101255933 A CN 101255933A
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- double coiled
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- 238000005476 soldering Methods 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 238000005516 engineering process Methods 0.000 title claims description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 21
- 239000010959 steel Substances 0.000 claims abstract description 21
- 238000000137 annealing Methods 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 238000002161 passivation Methods 0.000 claims abstract description 12
- 238000000465 moulding Methods 0.000 claims abstract description 9
- 238000005096 rolling process Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 5
- 238000005482 strain hardening Methods 0.000 claims abstract description 5
- 229910000679 solder Inorganic materials 0.000 claims abstract description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 36
- 229910052802 copper Inorganic materials 0.000 claims description 36
- 239000010949 copper Substances 0.000 claims description 36
- 239000007921 spray Substances 0.000 claims description 11
- 238000009413 insulation Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 230000002950 deficient Effects 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 238000004320 controlled atmosphere Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000010583 slow cooling Methods 0.000 claims description 3
- 238000010792 warming Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 239000012467 final product Substances 0.000 claims description 2
- 238000005219 brazing Methods 0.000 abstract description 2
- 238000001035 drying Methods 0.000 abstract 1
- 238000007789 sealing Methods 0.000 abstract 1
- 238000005507 spraying Methods 0.000 abstract 1
- 238000007493 shaping process Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
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Abstract
The present invention provides a production process of double wall brazed tube for connecting air-condition indoor and outdoor machine, putting a horizontally striping double-sided copperplating steel belt made from low-carbon gapless atomic steel on a uncoiling disk; coil rolling the copperplating steel belt at 720 degrees on forming machine to form double wall brazed tube canister; entering brazing furnace, and injecting decomposed protection gas NH3 in the furnace to solder; entering the double wall brazed tube after soldering to sealing cooling tube filled with decomposed protection gas NH3 to cool, and cooling slowly and cooling again; spraying and drying directly by passivation water; collecting to disk shape by winder and the disk shaped double wall brazed tube is obtained. The disk shaped double wall brazed tube is processed by off-line controllable atmosphere bright annealing and fixed length. The double wall brazed tube obtained by present invention has plastic strain ratio r >2.0, strain hardening index n >0.25, elongation delta >45%, yield strength delta s <150 Mp; when installing as air-condition connecting pipe, can realize manual molding in installing scene of air-condition connecting pipe, can't appear staved and cockled phenomenon of the tube wall, and reduces partial energy consume at the same time.
Description
Technical field
The invention belongs to the manufacturing technology field, be specifically related to a kind of air conditioner chamber inside/outside machine double-layer winding-soldering pipe production technology for connection of indoor.
Background technique
Double coiled welded tube is to use cold-strip steel after two-sided copper facing, and volume rolls 720 ° of formation double coiled welded tube sockets on the special molding unit, the more double-deck vertical masonry joint precision tube of a kind of small-bore thin-walled that forms through high temperature brazing.That this tubing has is high pressure resistant, corrosion-resistant, antivibration fatigue strength height, internal surface is bright and clean and characteristics such as low price, be the desirable tubing that substitutes copper pipe, produced recent two decades in China, be mainly used in the condenser tube (being replaced by the individual layer welded tube gradually now) of refrigerator, refrigerator-freezer early stage, be mainly used at present and make vehicle brake pipe and various oil pipe, very ripe in these application technology.
By industry standard YB/T069 regulation, at present, the double coiled welded tube industry production is 0.02～0.08% with the material Kohlenstoffgehalt.And in double coiled welded tube research is for many years made and is used, people pay close attention to the application of automotive industry always, improve withstand voltage, the intensity and the reliability of double coiled welded tube, even research and develop three layers, four layers volume welded tube forming technology (seeing document " mechanical engineering and the automation " fifth phase in October, 2005).Existing double coiled welded tube yield strength δ s is generally 200～260Mpa, and specific elongation δ is generally 25%～32%.Though withstand voltage and antivibration fatigue strength height has reduced its moldability, therefore, must be during moulding by tube bender or shaping die, people only use the strength of hand can't moulding; Simultaneously, big caliber flattens in the brake forming process easily, and tube wall is wrinkling, sometimes will be by wrinkle resistant plate.Just since above drawbacks limit the application of double coiled welded tube.As the air conditioner indoor and outdoor machine connecting tube, need offhand at the scene during installation, existing double coiled welded tube can't use, and still uses copper tube so far.China's copper natural resources shortage, price is higher, and the price of double coiled welded tube is about 30% of a copper tube.Simultaneously, the strength ratio double coiled welded tube of copper tube is much lower, yielding, is used for the air conditioner indoor and outdoor machine connecting tube, in installation process, require installation personnel can not produce because of the excessive damage horn mouth of exerting oneself and leak because of the firmly not enough stubborn leakage that tightly do not produce; Even install, in use meet by chance and collide with, also be easy to generate leakage.Use double coiled welded tube instead, and adopt double-deck enlarging Placement, can fundamentally stop connection mouth and leak.In addition, the thermal conductivity of copper is 384w/ (m a ℃), and the thermal conductivity of steel is 47w/ (m a ℃).The thermal conductivity of copper is the octuple of steel, and it is 1m that wall thickness is worked as in expression, and when the temperature difference was 1 ℃, at the heat (J) that the unit time (s) passed by unit area (m2), copper was the octuple of steel.Though increased lagging during use, to reduce heat loss, under equal conditions heat loss is higher than double coiled welded tube certainly.So air conditioner connecting pipe adopts double coiled welded tube, can reduce heat loss to a certain extent, plays energy-saving and cost-reducing effect.
The claimant has applied for " air conditioner chamber's inside/outside machine double-layer winding-soldering pipe production technology for connection of indoor " patent, application number: 200710017697.3 on April 24th, 2007.Utilize this patent to produce to satisfy the double coiled welded tube of air conditioner chamber's inside/outside machine connecting tube technical requirements.But the defective below in industrialized mass, also existing aspect two.One: after uncoiling-moulding-soldering, in order to guarantee the ductility of double coiled welded tube, technology is arranged on more than 830 ℃ and annealed with 30～50 second time, and the pressure refrigerating work procedure is not set.This moment, the tubing temperature was assembled very near 1084 ℃ of the fusing points of copper, copper knurl defective can occur, influenced pipe performance; Its two: adopt online 830 ℃～900 ℃, 30～50 seconds annealing process of insulation, belong to the high temperature, short time short annealing, the tubing yield strength is low inadequately, and artificial brake forming is relatively required great effort.
Summary of the invention
The objective of the invention is to solve existing double coiled welded tube and can't replace the problem that air conditioning chamber's inside/outside machine connects copper tube, provide that a kind of yield strength is lower, the artificial bending forming of being more convenient for, had good drawing and forming performance, can not occur flattening, tube wall puckering phenomena during shaping, be more suitable for air conditioner chamber's inside/outside machine double-layer winding-soldering pipe production technology for connection of indoor of industrialized mass.
For achieving the above object, the technical solution used in the present invention is:
1) uncoiling: at first with W (C)＜0.008%, the two-sided copper facing steel band of the itemize that the extra low carbon gapless atomic steel of W (N)＜0.003% is made lies against on the uncoiling dish;
2) moulding: the copper facing steel band rolled up on molding machine roll 720 ° and form the double coiled welded tube sockets;
3) soldering: the double coiled welded tube socket of forming is sent in the soldering oven continuously, and in stove, fed NH
3Decomposing protection gas is that solder carries out soldering at 1084 ℃+30 ℃ with copper;
4) water-cooled: the tubing temperature of coming out from soldering oven is near the fusing point of copper, manages the outside copper layer defectives such as forming bleed-out, copper knurl of very easily trickling, and should rapidly tubing be cooled off.Technology is provided with the double coiled welded tube that soldering is good and sends into interior logical NH continuously
3The closed conduit of decomposing protection gas, cool off with circulating water the pipeline outside, and double coiled welded tube is cooled to rapidly below the fusing point of copper.For guaranteeing the tubing ductility, the outlet temperature of closed conduit is controlled at 850 ℃-950 ℃;
5) slow cooling: the double coiled welded tube after the water-cooled is sent into interior logical NH continuously
3Carry out evenly slowly cooling in the Stainless Steel Tube of decomposing protection gas, Stainless Steel Tube external application air cooling is to slow down the rate of cooling of tubing;
6) water-cooled: in cooling tube, carry out the secondary water-cooled;
7) passivation spray: cooled double coiled welded tube is continued to be fed in the spray section, directly spray, make the volume surface of welded pipe form one deck passivation protection film with passivation water;
8) flaw detection: passivation sprays cooled double coiled welded tube and passes eddy current flaw detec, and volume welded tube welding quality is carried out flaw detection;
9) rolling: the double coiled welded tube after will detecting a flaw is gathered into plate-like with winder;
10) annealing: the double coiled welded tube after the rolling is carried out bright annealing, annealing process in bell-type controlled atmosphere bright annealing furnace: full power is warming up to 600 ℃, controls heating rate≤50 ℃/h again, when temperature reaches 850 ℃ of insulations 2-3 hour; Insulation finishes to be chilled to below 650 ℃ with stove, forces to be quickly cooled to come out of the stove below 60 ℃ to get final product.
Its plastic strain ratio of double coiled welded tube r＞2.0, strain hardening index n＞0.25, specific elongation δ＞45%, the yield strength δ s＜150Mpa that adopt production technology of the present invention to obtain.Strain hardening index n value is high, distortional stress increases sharply with strain, help realizing homogeneous deformation, simultaneously, have very high plastic strain ratio r again, have good drawing and forming performance, when installing as air conditioner connecting pipe is on-the-spot, can realize the artificial shaping of air conditioner connecting pipe erecting bed, flattening, tube wall puckering phenomena can not occur, air conditioner connecting pipe uses double coiled welded tube also can reduce the part energy consumption simultaneously.
The present invention adopts tube forming-soldering-water-cooled-rolling, the technology that tubing concentrates off-line to anneal in annealing furnace.After the soldering immediately water-cooled overcome the defective of copper knurl, and adopt off-line annealing, the performance yield strength that obtains lower (δ s＜150Mpa), feel is more soft, be easier to air conditioner on-the-spot install manual curved.
Description of drawings
Accompanying drawing is a manufacturing mechanism schematic representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
Referring to Fig. 1, the present invention produces double coiled welded tube copper facing steel band and selects extra low carbon gapless atomic steel [W (C)＜0.008% for use, the accurate cold-rolled strip of W (N)＜0.003%, steel band carries out two-sided copper facing earlier, copper facing thickness is 0.003～0.004 millimeter, according to the caliber size, the width that the sub-cut of copper facing steel band is become to require lies against copper facing itemize steel band on the uncoiling dish 1 again; Itemize steel band head and last steel band afterbody welding; The copper facing steel band rolled up on molding machine 2 roll 720 ° and form the double coiled welded tube sockets; Open NH
3Decomposing protection gas pipeline valve, with soldering oven 3, closed conduit 4, Stainless Steel Tube 5, in be full of NH
3Decomposing protection gas; Start production line, it is that solder carries out soldering with copper that soldering oven 3 temperature are transferred to 1084 ℃+30 ℃, logical NH in the double coiled welded tube that soldering is good is sent into
3In the airtight cooling tube 4 of decomposing protection gas, pipeline (4) is outside to be cooled off with circulating water, and double coiled welded tube is cooled to rapidly below the fusing point of copper, prevents to produce the copper knurl, guarantees 850 ℃-950 ℃ of outlet temperatures; Send into continuously in the Stainless Steel Tube 5 of outside air cooling and slowly cool off; Double coiled welded tube after the slow cooling is proceeded the secondary water-cooled in 6; Send at last in the spray section 7, directly spray, make the volume surface of welded pipe form one deck passivation protection film with passivation water; Passivation sprays cooled double coiled welded tube and passes eddy current flaw detec 8, and volume welded tube welding quality is carried out flaw detection; Double coiled welded tube after the flaw detection is gathered into plate-like with winder 9; Double coiled welded tube after the rolling is carried out bright annealing, annealing process in bell-type controlled atmosphere bright annealing furnace: full power is warming up to 600 ℃, controls heating rate≤50 ℃/h again, when temperature reaches 850 ℃ of insulations 2-3 hour; Insulation finishes to be chilled to below 650 ℃ with stove, force to be quickly cooled to come out of the stove below 60 ℃ can obtain having very high plastic strain ratio, very high strain hardening index and high specific elongation δ (δ＞45%), yield strength be low, the double coiled welded tube of good moldability.
Claims (2)
1, air conditioner chamber's inside/outside machine double-layer winding-soldering pipe production technology for connection of indoor is characterized in that:
1) uncoiling: at first with W (C)＜0.008%, the two-sided copper facing steel band of the itemize that the extra low carbon gapless atomic steel of W (N)＜0.003% is made lies against on the uncoiling dish (1);
2) moulding: the copper facing steel band is gone up volume at molding machine (2) roll 720 ° of formation double coiled welded tube sockets;
3) soldering: the double coiled welded tube socket of forming is sent in the soldering oven (3) continuously, and in stove, fed NH
3Decomposing protection gas is that solder carries out soldering at 1084 ℃+30 ℃ with copper;
4) water-cooled: the tubing temperature of coming out from soldering oven (3) is near the fusing point of copper, manages the outside copper layer defectives such as forming bleed-out, copper knurl of very easily trickling, and should rapidly tubing be cooled off.Technology is provided with the double coiled welded tube that soldering is good and sends into interior logical NH continuously
3The closed conduit of decomposing protection gas (4), pipeline (4) is outside to be cooled off with circulating water, and double coiled welded tube is cooled to rapidly below the fusing point of copper.For guaranteeing the tubing ductility, the outlet temperature of closed conduit (4) is controlled at 850 ℃-950 ℃;
5) slow cooling: the double coiled welded tube after the water-cooled is sent into interior logical NH continuously
3Carry out evenly slowly cooling in the Stainless Steel Tube of decomposing protection gas (5), Stainless Steel Tube (5) external application air cooling is to slow down the rate of cooling of tubing;
6) water-cooled: in cooling tube (6), carry out the secondary water-cooled;
7) passivation spray: cooled double coiled welded tube is continued to be fed in the spray section (7), directly spray, make the volume surface of welded pipe form one deck passivation protection film with passivation water;
8) flaw detection: passivation sprays cooled double coiled welded tube and passes eddy current flaw detec (8), and volume welded tube welding quality is carried out flaw detection;
9) rolling: the double coiled welded tube after will detecting a flaw is gathered into plate-like with winder (9);
10) annealing: the double coiled welded tube after the rolling is carried out bright annealing, annealing process in bell-type controlled atmosphere bright annealing furnace: full power is warming up to 600 ℃, controls heating rate≤50 ℃/h again, when temperature reaches 850 ℃ of insulations 2-3 hour; Insulation finishes to be chilled to below 650 ℃ with stove, forces to be quickly cooled to come out of the stove below 60 ℃ to get final product.
2, a kind of double coiled welded tube that makes according to the described production technology of claim 1 is characterized in that: its plastic strain ratio r＞2.0, strain hardening index n＞0.25, specific elongation δ＞45%, yield strength δ s＜150Mpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2008100177701A CN100547278C (en) | 2008-03-21 | 2008-03-21 | Air conditioner chamber's inside/outside machine double-layer winding-soldering pipe production technology for connection of indoor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2008100177701A CN100547278C (en) | 2008-03-21 | 2008-03-21 | Air conditioner chamber's inside/outside machine double-layer winding-soldering pipe production technology for connection of indoor |
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| Publication Number | Publication Date |
|---|---|
| CN101255933A true CN101255933A (en) | 2008-09-03 |
| CN100547278C CN100547278C (en) | 2009-10-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2008100177701A Expired - Fee Related CN100547278C (en) | 2008-03-21 | 2008-03-21 | Air conditioner chamber's inside/outside machine double-layer winding-soldering pipe production technology for connection of indoor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102125931B (en) * | 2010-01-12 | 2012-11-21 | 宝山钢铁股份有限公司 | Hot rolling production method for 400 series stainless steel coils |
-
2008
- 2008-03-21 CN CNB2008100177701A patent/CN100547278C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102125931B (en) * | 2010-01-12 | 2012-11-21 | 宝山钢铁股份有限公司 | Hot rolling production method for 400 series stainless steel coils |
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| CN100547278C (en) | 2009-10-07 |
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Owner name: WUHU YUANDA PIPE CO., LTD. Free format text: FORMER OWNER: LANFANG INDUSTRIAL CO., LTD., XI AN Effective date: 20111223 |
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Free format text: CORRECT: ADDRESS; FROM: 710016 XI AN, SHAANXI PROVINCE TO: 241002 WUHU, ANHUI PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20111223 Address after: 241002 No. 83 Jin Hua Road, hi tech Zone, Wuhu hi tech Development Zone, Anhui, China Patentee after: WUHU YUANDA PIPE INDUSTRY CO., LTD. Address before: 710016 No. 5 Xinxing Road, Shaanxi, Xi'an Patentee before: Lanfang Industrial Co., Ltd., Xi'an |
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Granted publication date: 20091007 Termination date: 20140321 |