US20040007040A1 - Method and tool for folding a metal strip - Google Patents

Method and tool for folding a metal strip Download PDF

Info

Publication number
US20040007040A1
US20040007040A1 US10/422,344 US42234403A US2004007040A1 US 20040007040 A1 US20040007040 A1 US 20040007040A1 US 42234403 A US42234403 A US 42234403A US 2004007040 A1 US2004007040 A1 US 2004007040A1
Authority
US
United States
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.)
Abandoned
Application number
US10/422,344
Other languages
English (en)
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
Assigned to DELPHI TECHNOLOGIES, INC. reassignment DELPHI TECHNOLOGIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ANTONOV, EVGENY, FOURILE, ROGER, IBRON, JAN
Publication of US20040007040A1 publication Critical patent/US20040007040A1/en
Abandoned legal-status Critical Current

Links

Images

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.
  • U.S. Pat. No. 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 is a side view of a heat exchanger comprising folded tubes formed in accordance with the method of the invention
  • FIG. 2 is an end view of a folded tube of FIG. 1;
  • FIG. 3 is an enlarged view of FIG. 2 showing the folded corners of the folded tube
  • FIG. 4 shows manufacturing steps from a metal strip to a folded tube according to the invention
  • FIG. 5 is a front view of a forming tool for pre-forming a metal strip
  • FIG. 6 is an enlarged view of FIG. 5 showing the bead for pressing a groove into the metal strip
  • FIG. 7 is an enlarged view of a front view of a forming tool for pre-forming a metal strip according to a further embodiment.
  • 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 . 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. 4 a ) to a folded tube (in FIG. 4 d ).
  • FIG. 4 a 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. 4 b .
  • 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. 4 c .
  • the marginal regions 78 , 80 are folded upwards so as to form a right angle with respect to the central region 76 . 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. 4 d .
  • 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. 4 a ) into a formed metal strip (as shown in FIG. 4 b ).
  • 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 .
US10/422,344 2002-05-14 2003-04-24 Method and tool for folding a metal strip Abandoned US20040007040A1 (en)

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

Publications (1)

Publication Number Publication Date
US20040007040A1 true US20040007040A1 (en) 2004-01-15

Family

ID=29267966

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/422,344 Abandoned US20040007040A1 (en) 2002-05-14 2003-04-24 Method and tool for folding a metal strip

Country Status (3)

Country Link
US (1) US20040007040A1 (de)
EP (1) EP1362649A1 (de)
LU (1) LU90919B1 (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090120617A1 (en) * 2007-10-31 2009-05-14 Denoual Christophe Tube For Heat Exchanger
US20100024508A1 (en) * 2007-02-01 2010-02-04 Frank Opferkuch Tubes and method and apparatus for producing tubes
US20120000634A1 (en) * 2010-03-31 2012-01-05 Rod Janusz Heat Exchanger
WO2012135450A3 (en) * 2011-03-29 2013-01-03 Mcnulty Frank G Rotary die forming process and apparatus for fabricating multi-port tubes
US20140027170A1 (en) * 2010-07-30 2014-01-30 Kabushiki Kaisha Toyota Jidoshokki Wiring substrate
US8834337B2 (en) 2010-06-07 2014-09-16 Robert Joseph Hannum Method of folding sheet materials via angled torsional strips
DE102014200708A1 (de) * 2014-01-16 2015-07-16 MAHLE Behr GmbH & Co. KG Flachrohr
US20150375345A1 (en) * 2013-03-19 2015-12-31 Hydro Aluminium Rolled Products Gmbh Method for producing a roll-clad aluminum workpiece, roll-clad aluminum workpiece, and use therefor
US11346616B2 (en) * 2020-03-27 2022-05-31 Denso International America, Inc. Dimpled heat exchanger tube

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10328001A1 (de) * 2003-06-21 2005-01-05 Modine Manufacturing Co., Racine Flaches Wärmetauscherrohr
US8091621B2 (en) 2006-01-19 2012-01-10 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
US8683690B2 (en) 2006-01-19 2014-04-01 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
US7921559B2 (en) 2006-01-19 2011-04-12 Modine Manufacturing Company Flat tube, flat tube heat exchanger, and method of manufacturing same
US8191258B2 (en) 2006-01-19 2012-06-05 Modine Manufacturing Company Flat tube, flat tube heat exchanger, and method of manufacturing same
US8438728B2 (en) 2006-01-19 2013-05-14 Modine Manufacturing Company Flat tube, flat tube heat exchanger, and method of manufacturing same
US8281489B2 (en) 2006-01-19 2012-10-09 Modine Manufacturing Company Flat tube, flat tube heat exchanger, and method of manufacturing same
DE102010023384B4 (de) 2010-06-10 2014-08-28 Modine Manufacturing Co. Herstellungsverfahren, insbesondere für Rohre und Abreißvorrichtung
DE102010048589A1 (de) * 2010-09-21 2012-03-22 Giw Gesellschaft Für Innovative Werkzeugsysteme Mbh Verfahren und Vorrichtung zum Formen flächiger Werkstücke

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1019073A (en) * 1909-08-04 1912-03-05 John Nazel Forming-machine.
US3184942A (en) * 1959-06-02 1965-05-25 Cookson Sheet Metal Dev Ltd Machine and method for shaping sheet metal
US4116038A (en) * 1976-03-23 1978-09-26 Knud Vilhelm Berthou Apparatus for shaping sheet material
US4595135A (en) * 1984-08-09 1986-06-17 Wallis Bernard J Method and apparatus for forming heat exchanger tubes
US5890288A (en) * 1997-08-21 1999-04-06 Ford Motor Company Method for making a heat exchanger tube
US5934365A (en) * 1997-08-21 1999-08-10 Ford Motor Company Heat exchanger
US6230533B1 (en) * 1998-12-11 2001-05-15 Valeo Thermique Moteur Folded tube for a heat exchanger and method for shaping it
US6474128B1 (en) * 2000-09-01 2002-11-05 Hon Hai Precision Ind. Co., Ltd. Method for folding over plate
US6591900B1 (en) * 1999-09-08 2003-07-15 Zexel Valeo Climate Control Corporation Heat exchanger, tube for heat exchanger, and method of manufacturing the heat exchanger and the tube
US6615488B2 (en) * 2002-02-04 2003-09-09 Delphi Technologies, Inc. Method of forming heat exchanger tube

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56148415A (en) * 1980-04-21 1981-11-17 Topy Ind Ltd Folding method for sheet
JPS5744420A (en) * 1980-08-29 1982-03-12 Matsushita Electric Works Ltd Roll forming method for metallic sheet
FR2655889A3 (fr) * 1989-12-19 1991-06-21 Realisations Lunetieres Ste Nl Procede de pliage de petites pieces.

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1019073A (en) * 1909-08-04 1912-03-05 John Nazel Forming-machine.
US3184942A (en) * 1959-06-02 1965-05-25 Cookson Sheet Metal Dev Ltd Machine and method for shaping sheet metal
US4116038A (en) * 1976-03-23 1978-09-26 Knud Vilhelm Berthou Apparatus for shaping sheet material
US4595135A (en) * 1984-08-09 1986-06-17 Wallis Bernard J Method and apparatus for forming heat exchanger tubes
US5890288A (en) * 1997-08-21 1999-04-06 Ford Motor Company Method for making a heat exchanger tube
US5934365A (en) * 1997-08-21 1999-08-10 Ford Motor Company Heat exchanger
US6230533B1 (en) * 1998-12-11 2001-05-15 Valeo Thermique Moteur Folded tube for a heat exchanger and method for shaping it
US6591900B1 (en) * 1999-09-08 2003-07-15 Zexel Valeo Climate Control Corporation Heat exchanger, tube for heat exchanger, and method of manufacturing the heat exchanger and the tube
US6474128B1 (en) * 2000-09-01 2002-11-05 Hon Hai Precision Ind. Co., Ltd. Method for folding over plate
US6615488B2 (en) * 2002-02-04 2003-09-09 Delphi Technologies, Inc. Method of forming heat exchanger tube

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100024508A1 (en) * 2007-02-01 2010-02-04 Frank Opferkuch Tubes and method and apparatus for producing tubes
US8561451B2 (en) 2007-02-01 2013-10-22 Modine Manufacturing Company Tubes and method and apparatus for producing tubes
US20090120617A1 (en) * 2007-10-31 2009-05-14 Denoual Christophe Tube For Heat Exchanger
US20120000634A1 (en) * 2010-03-31 2012-01-05 Rod Janusz Heat Exchanger
US8834337B2 (en) 2010-06-07 2014-09-16 Robert Joseph Hannum Method of folding sheet materials via angled torsional strips
US20140027170A1 (en) * 2010-07-30 2014-01-30 Kabushiki Kaisha Toyota Jidoshokki Wiring substrate
WO2012135450A3 (en) * 2011-03-29 2013-01-03 Mcnulty Frank G Rotary die forming process and apparatus for fabricating multi-port tubes
US8661676B2 (en) 2011-03-29 2014-03-04 Frank G. McNulty Rotary die forming process and apparatus for fabricating multi-port tubes
US20150375345A1 (en) * 2013-03-19 2015-12-31 Hydro Aluminium Rolled Products Gmbh Method for producing a roll-clad aluminum workpiece, roll-clad aluminum workpiece, and use therefor
US10065271B2 (en) * 2013-03-19 2018-09-04 Hydro Aluminium Rolled Products Gmbh Method for producing a roll-clad aluminum workpiece, roll-clad aluminum workpiece, and use therefor
DE102014200708A1 (de) * 2014-01-16 2015-07-16 MAHLE Behr GmbH & Co. KG Flachrohr
US11346616B2 (en) * 2020-03-27 2022-05-31 Denso International America, Inc. Dimpled heat exchanger tube

Also Published As

Publication number Publication date
LU90919B1 (en) 2003-11-17
EP1362649A1 (de) 2003-11-19

Similar Documents

Publication Publication Date Title
US20040007040A1 (en) Method and tool for folding a metal strip
US5622220A (en) Heat exchanger for automobile air conditioning system
AU665693B2 (en) Refrigerant tubes for heat exchangers
AU637007B2 (en) Heat exchanger
JP4171760B2 (ja) 偏平管および偏平管の製造方法
US5979051A (en) Heat exchanger and method of producing the same
JP3095624B2 (ja) 積層型熱交換器の偏平チューブのろう付け方法
JP4856942B2 (ja) 熱交換器用ヘッダタンクおよびこれに用いる外側プレートの製造方法
US6073688A (en) Flat tubes for heat exchanger
EP1712862A2 (de) Herstellung eines hartgelöteten Metallrohrs für Wärmetauscher
US20040244196A1 (en) Metal plate for producing flat tube, flat tube and process for producing the flat tube
JPH10318695A (ja) 熱交換器
JP5663413B2 (ja) サーペンタイン型熱交換器
JP2007147172A (ja) 熱交換器
US20180066901A1 (en) Header for a Heat Exchanger, and Method of Making the Same
JPH09250896A (ja) 熱交換器
JPWO2006129598A1 (ja) 熱交換器
EP1027942A1 (de) Rohr für wärmetauscher und verfahren zur herstellung
JPH07198287A (ja) 熱交換器のヘッダタンク構造
EP0866301A1 (de) Wärmetauscher und verfahren zu dessen herstellung
CA1336832C (en) Condensers
EP0853227A2 (de) Wärmetauscher
US20200240715A1 (en) Heat exchanger tube
JP2000346585A (ja) 熱交換器
JPH0842985A (ja) 熱交換器用冷媒流通管

Legal Events

Date Code Title Description
AS Assignment

Owner name: DELPHI TECHNOLOGIES, INC., MICHIGAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:IBRON, JAN;FOURILE, ROGER;ANTONOV, EVGENY;REEL/FRAME:014487/0260

Effective date: 20030811

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION