Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D53/00—Making other particular articles
  • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
  • B21D53/04—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of sheet metal
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D53/00—Making other particular articles
  • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
  • B21D53/04—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of sheet metal
  • B21D53/045—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of sheet metal by inflating partially united plates
• • 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
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/12—All metal or with adjacent metals
  • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
  • Y10T428/12736—Al-base component
  • Y10T428/12764—Next to Al-base component

Definitions

• the invention relates to a method for manufacturing aluminum panels with an integrated circuit, generally known under the name of roll-bond, of the biface type with two deformed faces or of the monoface type or OSF (one side flat) with a flat face and a distorted face.
• These panels are made from two sheets of aluminum or aluminum alloy, one of which is coated, on the areas intended to become the integrated circuit, with an ink intended to prevent welding between the two sheets.
• the two sheets are then welded by co-laminating.
• the non-welded areas are then inflated hydraulically or pneumatically to form a circuit, the essential part of which is used as a heat exchanger, and in particular as a cooling circuit for household refrigerators.
• Patent FR 2561368 (Cegedur Pechiney) discloses a continuous manufacturing process for single-sided roll-bond panels from two sheets of aluminum or aluminum alloys.
• European patent EP 0 703 427 Showa Aluminum proposes a process which aims to reduce the number of defects during inflation (rupture of channels or local absence of deformation).
• the existing production lines do not allow the manufacture of panels, and in particular single-sided panels, with strong mechanical characteristics. Furthermore, it is desirable to guarantee that the panels formed, before inflation, are free from unacceptable defects.
• the object of the invention is to provide a continuous manufacturing process for roll-bond panels, which is suitable for the manufacture of single-sided panels with strong mechanical characteristics and which allows, both for single-sided and type panels two-sided, early detection of faulty panels.
• the subject of the invention is a method for manufacturing aluminum single-sided integrated circuit panels comprising the surface preparation of two sheets of aluminum alloy, the deposition on one of the sheets of an anti-welding ink in areas reserved corresponding to the design of the circuit, the bonding by rolling of the sheets one on the other, and the expansion of the channels corresponding to the areas not welded using a pressurized fluid, in which one of the sheets is an alloy of the 1000 series and the other an alloy containing iron and manganese and such that Fe + Mn> 0.8% (by weight), and preferably> 1, even 1.5%.
• the alloy with iron and manganese is preferably obtained by continuous casting of strips between two cooled cylinders.
• the subject of the invention is also a continuous process for manufacturing integrated circuit panels of aluminum alloy comprising the following steps:
• the single figure represents, as a function of the annealing temperature, the recrystallized fraction for sheets of alloys 1050, 3003, 8040 and 8006 from continuous casting.
• alloys 1050 and 8040 accordinging to the designation of the Aluminum Association.
• the Applicant has noted during its tests that it is preferable to use for the planar face an alloy strip containing iron and manganese and such that Fe + Mn> 0.8% (by weight), and preferably> 1%, or even> 1.5%.
• An example of an alloy of this type is alloy 8006, the composition of which is registered with the Aluminum Association as follows (% by weight):
• the strip of iron and manganese alloy is produced from preferably by continuous casting of strips, and in particular by continuous casting between two cooled cylinders, for example by a Jumbo 3C TM machine from Pechiney Aluminum Engineering. It is known that the alloys containing manganese and / or iron obtained by continuous casting have, after a cold rolling range carried out directly after casting, that is to say without homogenization of the cast strip, a fine-grain microstructure. giving a stronger recrystallization resistance than the same alloys obtained from rolling plates. The microstructural characteristics of such bands obtained by continuous casting have been described in the literature, in particular in the articles by M. Slâmovâ et al: “Differences in
• strip A will denote the strip of aluminum or aluminum alloy to which the anti-welding ink is applied
• strip B the strip of aluminum or aluminum alloy which is applied to strip A
• composite strip the strip formed from strips A and B
• panels the panels formed by cutting the composite strip.
• the continuous process according to the invention comprises the following stages:
• the strips A and B can be fed by two unwinders.
• each of the two unwinders is provided with a mobile splicing device, making it possible to change each of the bands A and B without interrupting the running of the bands in the production line.
• the application of the anti-welding ink on the strip A can be carried out by screen printing techniques known to those skilled in the art.
• the quality control of this screen printing can be done by a qualified operator.
• the quality of this application is preferably controlled by an automatic industrial vision device capable of detecting unacceptable defects and of locating the position of the defective circuits on the tape A. This device acquires the image printed and compare it to a reference deemed perfect. This system then makes it possible to eliminate, before inflating the circuits, the panels on which a crippling fault has been detected.
• the preheating oven any continuous oven known to those skilled in the art can be used, for example a direct flame oven.
• this oven allows the regulation of the temperature so as to keep the temperature constant over the entire width of the bands A and B in a range between ⁇ 10 ° C maximum, preferably between ⁇ 7 ° C, and even more preferably in a range between ⁇ 5 ° C.
• strip B on strip A can be done in a traditional rolling mill and preferably in a quarto rolling mill.
• the two cylinders which come into contact with the strip are brushed during rolling.
• the brushing device disclosed in French patent FR 2568495 is suitable for this purpose.
• any continuous oven known to a person skilled in the art can be used.
• this oven allows the temperature to be regulated so as to keep the temperature constant over the entire width of the strip in a range between ⁇ 10 ° C, preferably between ⁇ 7 ° C, and even more preferably in an interval between ⁇ 5 ° C.
• the cooling of the composite strip can be done by spraying any refrigerant, liquid or gaseous, and preferably by spraying with water. If it is necessary at this stage to level the composite strip, this leveling can be done for example mechanically by more or less significant overlapping of the strip between two plies of metal rollers.
• the composite strip can be cut into panels using a fixed shear.
• the panels whose circuits have been detected as being defective during the control are then eliminated, before transferring the panels whose quality has been judged acceptable in the inflation press. This transfer is advantageously done by loading the panels in an elevator. The panels are then transferred using a robot, for example by a six-axis robot, into the press.
• the inflation press has several stages, preferably at least four stages, and even more preferably at least eight stages.
• the circuits are inflated using a pressurized fluid through a needle which is introduced into the inflation channel, between the two faces of each panel.
• the panels in the press can be inflated one after the other or, preferably, simultaneously.
• this press is of a construction such that it allows the inflation of single-sided panels, that is to say of panels comprising circuits inflated on one side only, the other side being flat, and of two-sided panels, that is to say of panels comprising circuits inflated on both sides.
• a back pressure is applied to the face opposite the flat face, according to techniques known to those skilled in the art and described, for example, in the aforementioned patent FR 2561368.
• the output of the press panels is advantageously done by a robot, for example a six-axis robot, which unloads the inflated panels from the press towards a descender, which transfers the panels to a stacker making it possible to constitute stacks of panels ready for be packaged for shipment.
• a robot for example a six-axis robot, which unloads the inflated panels from the press towards a descender, which transfers the panels to a stacker making it possible to constitute stacks of panels ready for be packaged for shipment.
• centering of the strips A and B and of the composite strip is carried out. For example, centering before the strip enters the rolling mill right-of-way is useful.
• Figure 1 shows a preferred embodiment of the invention.
• the invention as described above can advantageously be applied to the manufacture of all roll-bond panels for existing refrigerating appliances or for other heat exchange or transfer transfer applications.
• Type A strip means the strip (s) of aluminum or aluminum alloy on which (or which) is applied the anti-welding ink.
• type B strip is understood to mean the strip or strips of aluminum or aluminum alloy which will be applied to the strip or strips of type A, and which do not include screen printing.
• a roll-bond panel made up of three superposed strips comprising two superposed circuits is made up of two type A strips and a type B strip.
• composite strip means the strip formed from type A and type B strips, and by "panels" the panels formed by cutting the composite strip.
• the continuous process according to the invention then comprises the following steps: (a) supplying the production line with two type A bands and one type
• the chain is supplied by a mobile splicing device making it possible to change each of the bands A and B without interrupting the running of the bands in the production chain.
• This trolley is equipped with mobile welders without the addition of metal making it possible to make the connection between the strips from two metal coils.
• the stripping of strips A and B is done by a motorized roller stripper.
• the surfaces A and B intended to come into contact are brushed with motorized metal brushes.
• the stencil screen printing is done in a closed enclosure under pressure, to minimize dust deposits and the appearance of defects on the tape.
• Screens with canvas structure and thread density adjusted for printing desired are used; the screen printing is carried out by techniques known to those skilled in the art.
• the supply of non-stick ink on the canvas is automatic and allows a good uniformity of the quantity of ink.
• the change of screens during the change of series is done without stopping the line and is semi-automated. After screen printing, an additional ink stain is added to strip A at the end of the patterns; said spot serves as marking when cutting the composite strip into panels.
• the quality of screen printing is controlled by an industrial vision device, fitted with line cameras. All the patterns are acquired, processed and compared to a reference model image. This device makes it possible to check the functional dimensions of the patterns and to identify all the defects (such as superfluous stains, lack of ink or edges with imprecise definition). The position of the defective patterns is identified by the control computer to allow the panels containing these defective patterns to be removed before the inflation step.
• the preheating oven is a pass-through gas oven. It is composed of two parts allowing to heat successively the band B and the band A. Its power is
• the temperature of the strip in the oven is typically of the order of
• the oven has three heating zones twice. The temperature is kept constant by a regulation system at ⁇ 7 ° C.
• the rolling mill used is a quarto rolling mill enabling rolling forces of around 1400 tonnes to be achieved, with the possibility of variable balancing.
• the annealing furnace is a 1220 kW pass-through gas furnace.
• the temperature of the composite strip in the furnace is typically of the order of 400 ° C but can range up to 500 ° C, depending on the alloys used.
• the oven has four heating zones. The temperature is kept constant by a regulation system at ⁇ 7 ° C.
• the leveling of the composite strip is done by a leveler comprising 17 rolls of variable nesting, known to those skilled in the art.
• An ultrasonic sensor detects the ink stain deposited during the screen printing step and triggers the cutting of the composite strip into panels by a flying shears.
• the panels feed an elevator and are loaded in batches of eight into the inflation press using the six-axis robot.
• the inflation press is a 2,500-ton hydraulic press allowing the panels to be inflated simultaneously on all stages. Scheduled cycles allow online inflation of both sided and single sided panels. For single-sided panels, a back pressure is applied on all stages in addition to the inflation pressure. The inflation cycles are controlled by a computer.
• the press is equipped with leak detection devices during inflation and allows the elimination of the defective panels thus identified.
• the panels whose channels have been inflated are unloaded from the press by a second six-axis robot on a descender.
• the process parameters are adjusted according to the running speed measured at several points on the line.
• the speed of bands A and B can reach 15m / min.
• the speed of the composite strip can reach 30 m / min, for a rolling ratio of 2.
• the different line settings are managed automatically from a product database.
• the width of the strips used can reach 700 mm.
• the casting thickness was 7 mm, and the casting strip was cold rolled to 1.2 mm, then subjected to a 2 hour restorative annealing at 220 ° C.
• Strip B is made of 1050 alloy, with a thickness of 1.26 mm, obtained by hot rolling then cold rolling of rolling plates. At the outlet of the preheating oven, the temperature of strip A was 480 ° C, and that of strip B was 380 ° C. The rolling ratio applied was 2. The composite strip was then annealed in the annealing furnace at various temperatures mentioned in Table 1. Table V also shows the Vickers hardness of the two faces after annealing.
• an annealing temperature of 400 ° C represents the best compromise between the requirement of flatness and surface appearance of the flat face (favored by high hardness on the side of the strip A) and the 'requirement of sufficient formability of the panel to allow inflation of the channels without rupture (favored by a low hardness on the side of the strip B).
• the hardness of the panel on the side of the strip A is greater than 40 Vickers, and preferably greater than 43 Vickers or even 45 Vickers.
• Band A is made of 8040 alloy made from rolling plates.
• the thickness of strip A is 1.26 mm, and it has been subjected to a 10-hour restorative annealing at 250 ° C.
• Strip B is made of 1050 alloy, with a thickness of 1.26 mm, obtained by hot rolling then cold rolling of rolling plates. At the outlet of the preheating oven, the temperature of strip A was 480 ° C, and that of strip B was 380 ° C. The rolling ratio applied was 2. The strip composite was then annealed in the annealing oven at respective temperatures of 400 and 440 ° C. The hardnesses of the two faces after annealing are shown in Table 2.
• Example 2 It is found that lower hardnesses are obtained on the side of the strip A than in Example 2 for equivalent conditions. It is not possible to reduce the annealing temperature significantly to increase the hardness of the composite strip on the A side, because the recrystallization of 1050, which gives it suitable formability in the inflation press, requires under the conditions of method according to example 1 a temperature of at least 370 to 380 ° C.
• a laboratory test was carried out to verify that the strips of alloy 8006 obtained by continuous casting have a higher resistance to recrystallization than the other strips usually used for the manufacture of single-sided roll-bond panels. It is known that the hardness of the recrystallized bands is lower than that of the non-recrystallized bands; knowing that sufficient hardness is required to be able to use a strip as the flat face of a single-sided roll-bond panel, this test therefore makes it possible to pre-select the strips which can be used for this use.
• Alloy 8006 was prepared by continuous casting without homogenization. The reduction during cold rolling was 2. The sheets were then annealed in salt bath ovens for 15 s at variable temperatures between 380 and 440 ° C, and then determined the recrystallized fraction by an observation technique metallographic known to those skilled in the art.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Pressure Welding/Diffusion-Bonding (AREA)
• Metal Rolling (AREA)
• Laminated Bodies (AREA)
• Insulated Metal Substrates For Printed Circuits (AREA)
• Design And Manufacture Of Integrated Circuits (AREA)
• Semiconductor Integrated Circuits (AREA)
• Parts Printed On Printed Circuit Boards (AREA)
• Continuous Casting (AREA)
• Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
• Liquid Crystal (AREA)

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• 2000
  • 2000-12-11 FR FR0016082A patent/FR2817954B1/fr not_active Expired - Fee Related
• 2001
  • 2001-07-12 UA UA2003076468A patent/UA80528C2/uk unknown
  • 2001-12-05 EG EG20011302A patent/EG23026A/xx active
  • 2001-12-07 AT AT01270391T patent/ATE268233T1/de not_active IP Right Cessation
  • 2001-12-07 CA CA002431307A patent/CA2431307A1/fr not_active Abandoned
  • 2001-12-07 KR KR10-2003-7007681A patent/KR20030087618A/ko not_active Withdrawn
  • 2001-12-07 TR TR2004/01899T patent/TR200401899T4/xx unknown
  • 2001-12-07 BR BR0116059-1A patent/BR0116059A/pt not_active Application Discontinuation
  • 2001-12-07 AU AU2002217215A patent/AU2002217215A1/en not_active Abandoned
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  • 2001-12-07 EP EP01270391A patent/EP1353767B1/de not_active Expired - Lifetime
  • 2001-12-07 US US10/399,776 patent/US7226516B2/en not_active Expired - Fee Related
  • 2001-12-07 ES ES01270391T patent/ES2204356T3/es not_active Expired - Lifetime
  • 2001-12-07 DE DE60103667T patent/DE60103667T2/de not_active Expired - Fee Related
  • 2001-12-07 WO PCT/FR2001/003886 patent/WO2002047841A1/fr not_active Ceased
  • 2001-12-07 CN CNB018203345A patent/CN1247343C/zh not_active Expired - Fee Related
  • 2001-12-07 HU HU0303392A patent/HU223877B1/hu not_active IP Right Cessation
  • 2001-12-07 PL PL01362112A patent/PL362112A1/xx unknown
  • 2001-12-07 RU RU2003121023/02A patent/RU2281828C2/ru not_active IP Right Cessation
  • 2001-12-07 EP EP03024826A patent/EP1398096A1/de not_active Withdrawn
  • 2001-12-07 JP JP2002549402A patent/JP4054372B2/ja not_active Expired - Fee Related
• 2003
  • 2003-04-24 ZA ZA200303206A patent/ZA200303206B/en unknown
• 2007
  • 2007-06-08 JP JP2007152581A patent/JP2008001987A/ja active Pending

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