EP1362649A1 - Verfahren und Vorrichting zum Abkanten eines Metallbandes - Google Patents

Verfahren und Vorrichting zum Abkanten eines Metallbandes Download PDF

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Publication number
EP1362649A1
EP1362649A1 EP03101099A EP03101099A EP1362649A1 EP 1362649 A1 EP1362649 A1 EP 1362649A1 EP 03101099 A EP03101099 A EP 03101099A EP 03101099 A EP03101099 A EP 03101099A EP 1362649 A1 EP1362649 A1 EP 1362649A1
Authority
EP
European Patent Office
Prior art keywords
metal strip
folded
bead
groove
corner
Prior art date
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.)
Withdrawn
Application number
EP03101099A
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English (en)
French (fr)
Inventor
Jan Ibron
Roger Fourile
Evgeny Antonov
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Delphi Technologies Inc
Original Assignee
Delphi Technologies Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Delphi Technologies Inc filed Critical Delphi Technologies Inc
Publication of EP1362649A1 publication Critical patent/EP1362649A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/03—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits
    • F28D1/0391—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits a single plate being bent to form one or more conduits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/083—Supply, or operations combined with supply, of strip material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/151—Making tubes with multiple passages
    • 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
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/20—Bending sheet metal, not otherwise provided for

Definitions

  • the present invention generally relates to a method and tool for folding a metal strip, in particular for folding a metal strip for forming a folded tube for a heat exchanger.
  • Heat exchangers are well known in air conditioning systems, refrigerant systems, and in radiators, e.g. in automotive vehicles.
  • Such heat exchangers comprise a pair of manifolds, which are fluidly connected by tubes extending between the manifolds.
  • the tubes generally have two parallel large side walls, joined together by two small curved end walls, so as to form a cross-section of flattened shape.
  • a bank of tubes is obtained by an alternate stacking of such tubes arranged in parallel and of corrugated spacers, forming heat-exchange fins, which extend between the side walls of the tubes.
  • a known method of forming a tube for a heat exchanger is to extrude the tube in an extrusion process, wherein internal ribs are formed during the extrusion.
  • extruded tubes are very expensive to produce.
  • Another known method of forming a tube for a heat exchanger is to provide a flat, elongated metal strip and folding the ends of the strip so as to form a tube, generally referred to as folded tube.
  • Such a folded tube comprises a metal strip folded on itself so as to delimit two parallel channels separated by a spacer, the latter resulting from the joining of two marginal regions of the metal strip, each folded at right angles, from an outer face of the folded tube towards the inside of the folded tube.
  • the ends of the tubes are received in appropriate openings in the manifolds.
  • the assembly is then brazed in an appropriate furnace so as to constitute a heat exchanger.
  • the folded corner When the two marginal regions of the metal strip are folded at right angles to the metal strip, a folded corner is formed. In the majority of known tubes of this type, the folded corner exhibits a circular-arc shape, which results from the folding operation. When the two marginal regions are brought together to form the spacer, a relatively deep depression is created at the surface of one of the two side walls of the tube, more precisely, at the place where the marginal regions are folded inwards.
  • US-6,230,533 proposes to create a folded corner by folding a marginal region of the metal strip so that the marginal region forms an obtuse angle with respect to a central area of the metal strip.
  • a rib is formed on the opposite side of the obtuse angle.
  • This rib exhibits a rounded profile which is substantially in the shape of a circular arc and has to be deformed progressively in order to form a corner with a sharp-angled edge and a protruding swelling.
  • This method allows forming a folded tube, which does not have a deep depression in one of its side walls. However, the side wall now comprises a protruding swelling in the region where the two marginal regions are joined.
  • Another method for producing folded corners while avoiding or at least minimizing the depth of the depression in one of the side walls of the folded tube is to provide the folded corner with a sharp outer edge, i.e. a folded corner with a very small outer radius of bend.
  • a sharp outer edge can be obtained by providing the metal strip with a wedge shaped indentation on one side of the metal strip before folding.
  • the wedge shaped indentation allows, through the reduced thickness of the metal strip at the location of fold, to obtain a sharper outer edge.
  • the sharp outer edge allows to minimize the depth of the depression in the side wall of the folded tube and thereby ensures continuity of each of the side walls of the tubes and hence leaktightness of the joint between the folded tubes and the manifolds of the heat exchanger.
  • the local reduction in thickness of the metal strip formed by the wedge shaped indentation is quite substantial, which means that the strength of the material is reduced.
  • the folded corner is subjected to a high amount of material stress, and due to relatively high pressures in the folded tube, the folded tube is liable to break at the level of the indentations.
  • the object of the present invention is to provide a method for folding a metal strip so as to provide a strong folded corner having a sharp outer edge. This object is achieved by a method as claimed in claim 1.
  • Another object of the present invention is to provide a folded tube having a strong folded corner with a sharp outer edge. This object is achieved by a folded tube as claimed in claim 18.
  • a further object of the present invention is to provide a forming tool for forming a metal strip into a strong folded corner having a sharp outer edge. This object is achieved by a forming tool as claimed in claim 24.
  • a method for folding a metal strip comprising the steps of providing a metal strip having a first surface and a second surface; providing the metal strip with a groove in the first surface; folding the metal strip into a corner wherein the first surface forms a concave side of the corner and the second surface forms a convex side of the corner and the groove extends along the concave side of the corner.
  • the groove is pressed into the metal strip by means of a bead having a substantially rounded profile. The groove in the metal strip allows the formation of a folded corner with a sharp outer edge when the metal strip is folded about the groove.
  • a groove having a substantially rounded profile is pressed into the thickness of the metal strip, in the first surface thereof.
  • the amount of stress at the folded corner is reduced, so that a strong folded corner is obtained, which is able to withstand high pressures.
  • the bead preferably has circular or elliptical arc profile. It is however also possible to have the substantially rounded profile of the bead formed by polygonal surfaces.
  • the metal strip can have a thickness between about 0.15 mm and about 0.40 mm, preferably about 0.25 mm.
  • the bead can have a radius between about 0.8 and about 1.0 times the thickness of the metal strip.
  • the bead can have a protruding height between about 0.5 and about 1.1 times the thickness of the metal strip.
  • the radius of the bead is preferably about 1.0 times the thickness of the metal strip and the protruding height of the bead is preferably about 0.66 times the thickness of the metal strip.
  • the protruding height of the bead can e.g. be 0.21 mm, whereby a groove having a depth of 0.10 mm is created in the metal strip. It has to be noted that only part of the bead is pressed into the thickness of the metal strip. Indeed, the protruding height of the bead does not correspond to the depth of the groove created in the metal strip. Although, compared to the depth of the wedge shaped indentation of prior art methods, which can be about 0.06 mm, the depth of the groove can be bigger, the folded corner obtained via the claimed method is much stronger due to the rounded shape of the groove of the metal strip at the folded corner.
  • the groove is located so as to delimit a marginal region of the metal strip from a central region of the metal strip, the marginal region forming on the concave side of the corner an obtuse angle with respect to the central region, i.e. an angle between 90 degrees and 180 degrees.
  • the obtuse angle is preferably between about 135 and about 150 degrees, but is more preferably about 135 degrees.
  • the central region of the metal strip is advantageously bow shaped.
  • the unfolded parts of the central region can undergo some deformation due to the further folding operation. Due to the bow shape of the central region, the unfolded parts are deformed into a substantially plane part during the further folding operation.
  • the bow shape has to be designed according to the further folding operation that the metal strip will undergo.
  • the metal strip is advantageously further folded so that the marginal region forms a substantially right angle with respect to the central region.
  • the metal strip is provided with two grooves in the first surface, a first groove delimiting a first marginal region from the central region and a second groove delimiting a second marginal region from the central region, the first and second marginal regions being on opposite ends of the metal strip. Both marginal regions can then be folded at right angles to the central region.
  • the central region of the metal strip is then preferably folded such that the first and second marginal regions meet and the free ends of the marginal regions come into contact with the first surface of the central region, so as to form a folded tube.
  • the marginal regions which have previously been folded at right angles to the central region, come into contact with each other.
  • the free ends of the marginal regions are brought into contact with the first surface of the central region and form an internal wall, separating a first fluid channel from a second fluid channel within the folded tube.
  • the internal wall is generally located in the centre of the tube.
  • Such a folded tube is generally referred to as a "B-type" folded tube. It will be appreciated that many other configurations are possible.
  • the internal wall could e.g.
  • the marginal region can e.g. extend down from the first side wall to the second side wall, extend along the second sidewall and extend back up from the second side wall to the first side wall. Folded tubes having more than two fluid channels therein can thereby be formed. Many such configurations are well known in the art.
  • the individual corners of the marginal regions can be configures as strong folded corners with sharp outer edge according to the present method.
  • the metal strip is advantageously made from aluminium or aluminium alloy.
  • At least the second surface of the metal strip comprises cladding material thereon.
  • both the first and the second surfaces of the metal strip comprise cladding material thereon.
  • the folded tube is advantageously brazed so as to secure the first and second marginal regions to one another and to the first surface of the central region.
  • a folded tube comprising a first side wall having a first and a second portion; a second side wall extending substantially parallel to the first side wall; and a first and a second end wall for connecting the first side wall to the second side wall.
  • the folded tube is formed in one piece from a metal strip and the first and second portions of the first side wall each have a marginal region on their respective free ends, the marginal regions being folded into a corner so as to extend inwardly from the first side wall towards the second side wall; a groove being arranged on the concave side of the corner.
  • the groove has substantially rounded profile.
  • the groove in the metal strip allows the formation of a folded corner with a sharp outer edge when the metal strip is folded about the groove. Due to the substantially rounded profile of the groove, the amount of stress at the folded corner is reduced, so that a strong folded corner is obtained, which is able to withstand high pressures.
  • the groove preferably has circular or elliptical arc profile. It is however also possible to have the substantially rounded profile of the groove formed by polygonal surfaces.
  • the groove can have a depth between about 0.1 and about 0.4 times the thickness of the metal strip.
  • the depth of the groove is preferably about 0.2 times the thickness of the metal strip.
  • the folded tube is preferably folded according to the above method.
  • a forming tool for forming a metal strip comprising a bead for pushing a groove into the metal strip at a desired location of bend.
  • the bead has substantially rounded profile.
  • the groove in the metal strip allows the formation of a folded corner with a sharp outer edge when the metal strip is folded about the groove. Due to the substantially rounded profile of the bead, a groove having a substantially rounded profile is pressed into the thickness of the metal strip, in the first surface thereof. With a groove of such shape, the amount of stress at the folded corner is reduced, so that a strong folded corner is obtained, which is able to withstand high pressures.
  • the bead preferably has circular or elliptical arc profile. It is however also possible to have the substantially rounded profile of the bead formed by polygonal surfaces.
  • the forming tool is preferably a roller assembly comprising a first and second roller, the first roller comprising the bead.
  • the second roller can comprise a cut-out for receiving some of the metal displaced by the bead of the first roller.
  • the bead can have a protruding height between about 0.5 and about 1.1 times the thickness of the metal strip.
  • the protruding height of the bead is preferably about 0.66 times the thickness of the metal strip.
  • the cut-out can have a depth between about 0 and about 0.5 times, preferably about 0.3 times the thickness of the metal strip.
  • FIG.1 A side view of a heat exchanger comprising folded tubes according to the invention is shown in Fig.1.
  • a heat exchanger 10 comprises a pair of manifolds 12 which are spaced apart and which extend in a direction substantially parallel to one another.
  • a number of folded tubes 14 extend between the manifolds 12.
  • the folded tubes 14 are spaced apart and extend in a longitudinal direction X substantially parallel to one another, and substantially perpendicular to the axial direction of the manifolds 12.
  • Each end 16 of each folded tube 14 is located in a corresponding receiving opening 18 formed in the manifolds 12 to allow fluid flow between the folded tubes and the manifolds.
  • a fluid inlet pipe 20 is connected to one of the manifolds 12, and a fluid outlet pipe 22 is connected to the other manifold 12 (or alternatively to the same manifold as the inlet fluid pipe).
  • One or more baffle plates 24 may be secured inside the manifolds 12 to provide predetermined fluid flow path through the manifolds and the folded tubes 14.
  • Sinusoidal fins 26 are positioned between, and in contact with, adjacent folded tubes 14. The fins 26 act to provide improved heat transfer between the fluid in the folded tubes 14 and air flowing through the heat exchanger 10 between the folded tubes.
  • a pair of reinforcement plates 28 may extend between the manifolds 12 outwardly of the folded tubes 14. End caps 34 are positioned at each end 30 of the manifolds 12 to fluidly close the manifolds.
  • the heat exchanger 10 is manufactured by assembling the above mentioned components and then brazing to secure the components together and form fluid tight joints where required.
  • Each folded tube 14 is formed in one piece from a metal strip, which can be aluminium or aluminium alloy.
  • the metal strip has a cladding material on at least one side, and is substantially rectangular before formation into the folded tube 14.
  • the metal strip is folded to form the folded tube 14, with the clad side of the metal strip being outermost (when clad on one side only).
  • the folded tube 14 is formed with a first side wall 40 and a second side wall 42 which extend in the longitudinal direction substantially parallel to one another, are substantially planar, and which are connected by end walls 44.
  • the first side wall 40 has first and second portions 46, 48, which are folded inwardly at their free end to form internal walls 50, 52 internally of the side walls 40, 42 and the end walls 44.
  • Each of the internal walls 50, 52 extends in the longitudinal direction X and contacts the first and second side walls 40, 42.
  • the internal walls 50, 52 are preferably substantially perpendicular to the side walls 40, 42.
  • the folded tube 14 has two separate fluid channels 54, 56 extending through the folded tube in the longitudinal direction X. The presence of the cladding secures the internal walls 50, 52 together during the brazing process.
  • Folded corners 58, 60 are created where the internal walls 50, 52 are folded inwards.
  • An enlarged view, showing these folded corners 58, 60 in more detail, can be seen in Fig.3.
  • a groove 62, 62' is pressed into the metal strip on the surface that is to become the inside of the folded tube 14. This groove 62, 62' ensures that when the internal walls 50, 52 are folded substantially perpendicular to the first and second portions 46, 48, a strong folded corner 58, 60 with a sharp outer edge 64, 66 is created.
  • the folded corner 58, 60 has a very small outer radius of bend.
  • a depression 68 is formed in the first side wall 40.
  • the folded corners 58, 60 Due to the fact that the folded corners 58, 60 have a sharp outer edge 64, 66, the depth of the depression 68 is very limited and the depression 68 can easily be filled with brazing alloy, so that leaktightness at the joint between the folded tube 14 and the manifold 12 is ensured. Furthermore, due to its shape, the groove 62, 62' does not substantially reduce the material thickness of the metal strip in the folded corner 58, 60, and there is no substantial amount of stress in the folded corners 58, 60. The folded corners 58, 60 are hence not liable to breaking when higher fluid pressures are applied within the fluid channels 54, 56.
  • Fig.4 schematically shows the folded tube in individual process stages, i.e. from a flat metal strip (in Fig.4a) to a folded tube (in Fig.4d).
  • Fig.4a shows a flat metal strip 70 having a first surface 72 and a second surface 74, the metal strip 70 comprising a central region 76 and two marginal regions 78, 80. At least the second surface 74 has cladding material (not shown) thereon.
  • the flat metal strip 70 passes through a first roller assembly as shown in Fig.5 and is folded into a folded metal strip 70 as shown in Fig.4b.
  • the marginal regions 78, 80 are folded upwards so as to form an obtuse angle ⁇ with respect to the central region 76, the obtuse angle ⁇ being on the side of the first surface 72 of the metal strip 70.
  • the obtuse angle ⁇ is generally between about 135 and about 150 degrees, preferably about 135 degrees. As the metal strip 70 is folded in this way, two folded corners 58, 60 are formed.
  • One of the rollers of the first roller assembly comprises a first bead for pressing a first groove 62 into the metal strip 70 on the first surface 72, between the first marginal region 78 and the central region 76, and a second bead for pressing a second groove 62' into the metal strip 70 on the first surface 72, between the second marginal region 80 and the central region 76.
  • the first and second beads have a substantially rounded profile so as to create grooves 62, 62' having substantially rounded profile in the metal strip 70.
  • the folded metal strip 70 then passes through a second roller assembly to be folded into a folded metal strip 70 as shown in Fig.4c.
  • the marginal regions 78, 80 are folded upwards so as to form a right angle with respect to the central region 76.
  • the folded corners 58, 60 Due to the grooves 62, 62', the folded corners 58, 60 have a sharp outer edge 64, 66, i.e. the folded corner 58, 60 has a very small outer radius of bend.
  • the folded metal strip is then folded into a folded tube, as shown in Fig.4d.
  • the central region 76 is folded, so that the marginal regions 78, 80 come into contact with each other
  • Fig.5 partly shows a roller assembly 82 comprising a first roller 84 and a second roller 86 for forming a metal strip (as shown in Fig.4a) into a formed metal strip (as shown in Fig.4b).
  • the first and second rollers 84, 86 rotate in opposite directions about respective parallel axes 88, 90.
  • the central region of the metal strip can be curved.
  • the first and second rollers 84, 86 of the roller assembly 82 comprise a bow shaped profile 92.
  • the first roller 84 comprises at its end portions 94, 96 a bead 98, 100.
  • the bead 100 can be closer described by referring to Fig.6, which is an enlarged view of the end portion 96 of the first roller 86, with the corresponding end portion 106 of the second roller 86.
  • the end portion 96 of the first roller 84 comprises a first surface 102 and a second surface 104 forming an obtuse angle between them.
  • the second roller 86 has a corresponding end portion 106 having a third surface 108 and a fourth surface 110.
  • the first surface 102 is parallel to the third surface 108.
  • the second surface 104 is parallel to the fourth surface.
  • the metal strip is folded into a folded corner between the two rollers 84, 86; the central region is formed between the first and third surfaces 102, 108, whereas the marginal region is formed between the second and fourth surfaces 104, 110.
  • the end portion 96 of the first roller 84 comprises a bead 100, on the corner where the first and second surfaces 102, 104 meet.
  • the bead 100 has a substantially rounded profile having a height h of 0.21 mm.
  • the end portion 106 of the second roller 86 comprises a cut-out 112 having a depth d of 0.12 mm.
  • the cut-out 112 comprises a fifth surface 114 connected to the third surface 108 and a sixth surface 116 connected to the fourth surface 110.
  • third surface 108 is at an angle of 8 degrees with respect to the axis of the roller, whereas the fifth surface 114 is at an angle of 22 degrees.
  • the fourth surface 110 is at an angle of 33 degrees with respect to the axis of the roller, whereas the sixth surface 116 is at an angle of 45 degrees.
  • the bead 100 presses a groove into the first surface of the metal strip, the second surface can deform. The deformation of the second surface further helps to achieve a folded corner with a sharp outer edge.
  • the folded corner comprises a protrusion after the metal strip has passed this roller assembly, this protrusion disappears as the folded corner is further folded so as to form a right-angled corner.
  • the protrusion helps to form a sharper outer edge of the folded corner.
  • the meeting point 120 between the first and second surfaces 102, 104 and the meeting point 122 between the third and fourth surfaces 108, 110 are slightly offset on the horizontal axis.
  • FIG.7 Another embodiment of the roller assembly 82 is shown in Fig.7.
  • the second roller 86' of the roller assembly 82' does not comprise a cut-out 112 as indicated in Fig.6.
  • Fig.7 also shows a metal strip 124 between the two rollers 84, 86'. It can be seen that the gap between the two rollers 84, 86' is bigger than the thickness of the metal strip 124. It follows tat only part of the bead is pressed into the metal strip, i.e. the protruding height of the bead 100 does not correspond to the depth of the groove created in the metal strip 124.
EP03101099A 2002-05-14 2003-04-22 Verfahren und Vorrichting zum Abkanten eines Metallbandes Withdrawn EP1362649A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU90919A LU90919B1 (en) 2002-05-14 2002-05-14 Method and tool for folding a metal strip
LU90919 2002-05-14

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Publication Number Publication Date
EP1362649A1 true EP1362649A1 (de) 2003-11-19

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EP (1) EP1362649A1 (de)
LU (1) LU90919B1 (de)

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US7921559B2 (en) 2006-01-19 2011-04-12 Modine Manufacturing Company Flat tube, flat tube heat exchanger, and method of manufacturing same
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WO2012037914A1 (de) * 2010-09-21 2012-03-29 Giw Gesellschaft Für Innovative Werkzeugsysteme Mbh Verfahren und vorrichtung zum formen flächiger werkstücke
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US8434227B2 (en) 2006-01-19 2013-05-07 Modine Manufacturing Company Method of forming heat exchanger tubes
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FR2923002B1 (fr) * 2007-10-31 2015-12-11 Valeo Systemes Thermiques Tube pour echangeur thermique
EP2375208B1 (de) * 2010-03-31 2012-12-05 VALEO AUTOSYSTEMY Sp. Z. o.o. Verbesserter Wärmetauscher
US8834337B2 (en) 2010-06-07 2014-09-16 Robert Joseph Hannum Method of folding sheet materials via angled torsional strips
JP2012049504A (ja) * 2010-07-30 2012-03-08 Toyota Industries Corp 配線基板
US8661676B2 (en) 2011-03-29 2014-03-04 Frank G. McNulty Rotary die forming process and apparatus for fabricating multi-port tubes
DE102013102821A1 (de) * 2013-03-19 2014-09-25 Hydro Aluminium Rolled Products Gmbh Verfahren zur Herstellung eines walzplattierten Aluminiumwerkstücks, walzplattiertes Aluminiumwerkstück und Verwendung dafür
DE102014200708A1 (de) * 2014-01-16 2015-07-16 MAHLE Behr GmbH & Co. KG Flachrohr
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US7665512B2 (en) * 2003-06-21 2010-02-23 Modine Manufacturing Company Flat heat exchanger tube
US8191258B2 (en) 2006-01-19 2012-06-05 Modine Manufacturing Company Flat tube, flat tube heat exchanger, and method of manufacturing same
EP1994352A4 (de) * 2006-01-19 2010-06-02 Modine Mfg Co Flachrohr, flachrohrwärmetauscher und herstellungsverfahren dafür
US7921559B2 (en) 2006-01-19 2011-04-12 Modine Manufacturing Company Flat tube, flat tube heat exchanger, and method of manufacturing same
US8091621B2 (en) 2006-01-19 2012-01-10 Modine Manufacturing Company Flat tube, flat tube heat exchanger, and method of manufacturing same
EP1994352A2 (de) * 2006-01-19 2008-11-26 Modine Manufacturing Company Flachrohr, flachrohrwärmetauscher und herstellungsverfahren dafür
US8281489B2 (en) 2006-01-19 2012-10-09 Modine Manufacturing Company Flat tube, flat tube heat exchanger, and method of manufacturing same
US8434227B2 (en) 2006-01-19 2013-05-07 Modine Manufacturing Company Method of forming heat exchanger tubes
US8438728B2 (en) 2006-01-19 2013-05-14 Modine Manufacturing Company Flat tube, flat tube heat exchanger, and method of manufacturing same
US8683690B2 (en) 2006-01-19 2014-04-01 Modine Manufacturing Company Flat tube, flat tube heat exchanger, and method of manufacturing same
US8726508B2 (en) 2006-01-19 2014-05-20 Modine Manufacturing Company Flat tube, flat tube heat exchanger, and method of manufacturing same
US9038267B2 (en) 2010-06-10 2015-05-26 Modine Manufacturing Company Method of separating heat exchanger tubes and an apparatus for same
WO2012037914A1 (de) * 2010-09-21 2012-03-29 Giw Gesellschaft Für Innovative Werkzeugsysteme Mbh Verfahren und vorrichtung zum formen flächiger werkstücke

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