EP0574645B1 - Verfahren zum Verbinden von Warmaustauscherelementen an einer Platte und Werkzeug zum Verformen des Rohrendes von einem länglichen Durchschnitt zu einem kreisförmigen Durchschnitt - Google Patents

Verfahren zum Verbinden von Warmaustauscherelementen an einer Platte und Werkzeug zum Verformen des Rohrendes von einem länglichen Durchschnitt zu einem kreisförmigen Durchschnitt Download PDF

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Publication number
EP0574645B1
EP0574645B1 EP19920830307 EP92830307A EP0574645B1 EP 0574645 B1 EP0574645 B1 EP 0574645B1 EP 19920830307 EP19920830307 EP 19920830307 EP 92830307 A EP92830307 A EP 92830307A EP 0574645 B1 EP0574645 B1 EP 0574645B1
Authority
EP
European Patent Office
Prior art keywords
section
cross
tube
tubes
cavity
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.)
Expired - Lifetime
Application number
EP19920830307
Other languages
English (en)
French (fr)
Other versions
EP0574645A1 (de
Inventor
Andrea Parola
Erminio Michielon
Luigi Dentis
Maurizio Parrino
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.)
Denso Thermal Systems SpA
Original Assignee
Magneti Marelli Climatizzazione SpA
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 Magneti Marelli Climatizzazione SpA filed Critical Magneti Marelli Climatizzazione SpA
Priority to ES92830307T priority Critical patent/ES2082437T3/es
Priority to EP19920830307 priority patent/EP0574645B1/de
Priority to DE1992607755 priority patent/DE69207755T2/de
Publication of EP0574645A1 publication Critical patent/EP0574645A1/de
Application granted granted Critical
Publication of EP0574645B1 publication Critical patent/EP0574645B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/04—Arrangements for sealing elements into header boxes or end plates
    • F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
    • F28F9/165—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by using additional preformed parts, e.g. sleeves, gaskets
    • 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
    • B21D41/00—Application of procedures in order to alter the diameter of tube ends
    • 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
    • B21D53/08—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of both metal tubes and sheet metal
    • B21D53/085—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of both metal tubes and sheet metal with fins places on zig-zag tubes or parallel tubes

Definitions

  • the present invention relates to the manufacture of heat-exchangers, particularly for motor vehicles, and is concerned with a method of fixing an end plate to a heat-exchange system including a plurality of tubes with elongate cross-sections, in which the ends of the tubes are shaped so as to have circular cross-sections before being inserted in sealing collars of circular cross-section disposed in respective holes in the end plate, and in which the tubes are fixed to the end plate by the radial expansion of their ends after they have been fitted in the sealing collars.
  • a method of shaping the end of a metal heat-exchanger tube of elongate cross-section to give it a circular cross-section is known from the French patent No. 2,462,215.
  • the method described in this document consists of two steps, that is, one step in which the end of the tube undergoes radial compression, and another step in which a punch is force-fitted into the end. If the radial deformation is effected first, the end of the tube is compressed between two jaws which are movable perpendicular to the axis of the tube along the major axis of its cross-section. If the punch is force-fitted in the end of the tube first, the subsequent radial compression is effected by means of a bush with a flared end which is movable along the axis of the tube.
  • the two-step method of shaping the ends of the tubes has various disadvantages.
  • radial compression effected by jaws movable perpendicular to the axis of the tube cannot easily be used for heat exchangers with two or more rows of tubes, since it would require too much space between the rows.
  • the radial deformation is effected by means of a bush slidable along the axis of the tube, difficulties are encountered in removing the tools from the ends of the tubes since, upon completion of the shaping, both the bush and the punch are coupled with the end of the tube at the same time.
  • the shaping tools and machines are more complex than with a single-step shaping method.
  • the present invention provides for a method with the features of claim 1 respectively a tool with the features of claim 2.
  • the method of the invention is quicker, requires simpler tools, and involves a simplification of the machines which move the tools since the machines have to effect only one movement instead of the two movements needed for two-step methods.
  • a heat-exchange system indicated 10 includes a plurality of tubes 12 having flat cross-sections each constituted by two straight lines 14 and two semicircular connecting portions 16.
  • the maximum and minimum dimensions of the cross-section of each tube 12 are indicated a and b ; the ratio a / b is of the order of 3:1.
  • the tubes 12 are arranged in two parallel rows, 18, 20.
  • the tubes 12 are fixed to metal fins 22 disposed one above another along the longitudinal axes of the tubes 12.
  • the fins 22 have holes, with shapes corresponding to the profiles of the tubes 12, in which the tubes 12 are fitted with slight radial clearance.
  • the tubes 12 are fixed to the fins 22, in known manner, by the expansion of the tubes 12.
  • the ends 24 of the tubes are fixed to an end plate 26 ( Figures 3 and 4) which constitutes the base wall of a header tank (not shown) for collecting the cooling liquid which circulates in the tubes 12.
  • the end plate 26 has a plurality of holes 28 with circular cross-sections, in which sealing collars 30 of a gasket 32 of elastomeric material are disposed.
  • each tool 34 is constituted by a metal body having a cavity 36 with an opening 38. At a distance e from the opening 38, along the axis of the cavity 36, the cross-section of the cavity 36 is circular.
  • a portion 40 of the cavity 36 has a tapered wall which is inclined at 2-3 o to the longitudinal axis of the cavity 36. The length of the portion 40 is equal to the desired length of the circular cross-sectioned end portion of each tube 12.
  • a connecting portion 42 of radius R which gives the end edge of the tube a perfectly circular cross-section and makes it easier to fit in a hole in a sealing collar 30 by forming a kind of lead-in.
  • the cavity 36 communicates with a hole 44 for fixing the tool 34 to a frame (not shown) which moves the tools 34 along the line indicated by the arrow 46 in Figure 1.
  • the opening 38 has an oval cross-section the maximum dimension c which is slightly greater than the maximum dimension a of the cross-section of the undeformed tube 12.
  • the minimum dimension, indicated d , of the opening 38 is equal to or greater than the maximum diameter of the circular cross-sectioned portion 40 of the cavity 36.
  • the opening 38 is connected to the tapered portion 40 of the cavity 36 by means of a connecting region having two opposed surfaces 50 which, in use, exert gradual pressure on the walls 16 of the tube 12 which have the smallest radius of curvature.
  • the ends 24 of the tubes 12 are shaped by being force-fitted in the respective cavities 36 of the tools 34.
  • the taper of the portion 40 of each cavity 36 facilitates the removal of the tools 34 upon completion of the shaping.
  • Figure 8 shows the end of a tube 12 which has been shaped.
  • the tool 34 causes no stretching of the material in the deformed region.
  • the perimeter of the end 24 is the same as or slightly shorter than the perimeter of the undeformed portion of the tube 12.
  • the ends 24 of the tubes 12 After the ends 24 of the tubes 12 have been shaped by the tools 34, the ends 24 are fitted in the cylindrical holes in the sealing collars 30 with radial clearance (see Figure 3). Punches 52 are then inserted in the ends of the tubes 12 to expand the ends 24 radially against the sealing collars 30. This expansion connects the tubes 12 to the end plate 26 mechanically and in a fluid-tight manner. During the expansion, the edges 24 a of the end 24 are turned over so as to improve the seal resulting from the expansion of the end 24.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Claims (4)

  1. Verfahren zur Befestigung einer Endplatte (26) an einem Wärmeaustauschsystem (10) umfassend eine Mehrzahl von Rohren (12) mit länglichem Querschnitt, bei dem die Enden (24) der Rohre so geformt werden, daß sie einen kreisförmigen Querschnitt aufweisen, bevor sie in dichtende, in entsprechenden Öffnungen (28) in der Endplatte (26) angeordneten Manschetten (30) mit kreisförmigem Querschnitt eingepaßt werden, und bei dem die Rohre (12) nach dem Einpassen in die dichtenden Manschetten (30) durch radiales Dehnen ihrer Enden (24) an der Endplatte (26) befestigt werden, dadurch gekennzeichnet, daß die Enden (24) der Rohre in einem einzigen Schritt durch radiales Pressen von außen geformt werden, welches mit Hilfe eines Hohlkörpers (34) mit einem Hohlraum (36) erfolgt, der einen von länglich bis kreisförmig varrierenden Querschnitt aufweist, wobei der Hohlkörper entlang der Achse des Rohres bewegbar und so geformt ist, daß er auf die Wände (16) des Rohres (12), die den kleinsten Krümmungsradius aufweisen, Druck ausübt, und daß die Enden der Rohre (24) in die dichtenden Manschetten (30) ohne weitere Verformung eingepaßt werden.
  2. Werkzeug zur Durchführung eines Verfahrens gemäß Anspruch 1, zum Formen des Endes eines Wärmeaustauschrohres, um diesem einen kreisförmigen Querschnitt zu verleihen, dadurch gekennzeichnet, daß es einen einheitlichen Körper (34) mit einer Öffnung (38) umfaßt, die mit einem Hohlraum (36) in Verbindung steht, dessen Querschnitt entlang seiner Längsachse variiert, wobei der Querschnitt des Hohlraumes nahe der Öffnung länglich ist, sodaß er den Querschnitt des nicht verformten Rohres einschließt, und in einem vorbestimmten Abstand (e) von der Öffnung (38) entlang der Achse des Hohlraumes kreisförmig ist.
  3. Werkzeug nach Anspruch 2, dadurch gekennzeichnet, daß der Querschnitt des Hohlraumes nahe der Öffnung (38) oval ist und eine maximale Dimension (c), die größer ist als die maximale Dimension (a) des Querschnittes des nicht verformten Rohres, und eine minimale Dimension (d) hat, die gleich oder größer ist als der Durchmesser jenes Bereiches des Hohlraumes (36), der einen kreisförmigen Querschnitt aufweist.
  4. Werkzeug nach Anspruch 3, dadurch gekennzeichnet, daß der Hohlraum (36) einen Bereich (40) mit einer sich verjüngenden Wand aufweist, deren Länge, entlang der Achse des Hohlraumes, gleich ist der gewünschten axialen Länge des Endabschnittes des Rohres mit kreisförmigem Querschnitt.
EP19920830307 1992-06-16 1992-06-16 Verfahren zum Verbinden von Warmaustauscherelementen an einer Platte und Werkzeug zum Verformen des Rohrendes von einem länglichen Durchschnitt zu einem kreisförmigen Durchschnitt Expired - Lifetime EP0574645B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
ES92830307T ES2082437T3 (es) 1992-06-16 1992-06-16 Un metodo para fijar elementos intercambiadores de calor a una placa y una herramienta para conformar una seccion de cruz circular a un tubo de seccion en cruz oblonga.
EP19920830307 EP0574645B1 (de) 1992-06-16 1992-06-16 Verfahren zum Verbinden von Warmaustauscherelementen an einer Platte und Werkzeug zum Verformen des Rohrendes von einem länglichen Durchschnitt zu einem kreisförmigen Durchschnitt
DE1992607755 DE69207755T2 (de) 1992-06-16 1992-06-16 Verfahren zum Verbinden von Warmaustauscherelementen an einer Platte und Werkzeug zum Verformen des Rohrendes von einem länglichen Durchschnitt zu einem kreisförmigen Durchschnitt

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19920830307 EP0574645B1 (de) 1992-06-16 1992-06-16 Verfahren zum Verbinden von Warmaustauscherelementen an einer Platte und Werkzeug zum Verformen des Rohrendes von einem länglichen Durchschnitt zu einem kreisförmigen Durchschnitt

Publications (2)

Publication Number Publication Date
EP0574645A1 EP0574645A1 (de) 1993-12-22
EP0574645B1 true EP0574645B1 (de) 1996-01-17

Family

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Family Applications (1)

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EP19920830307 Expired - Lifetime EP0574645B1 (de) 1992-06-16 1992-06-16 Verfahren zum Verbinden von Warmaustauscherelementen an einer Platte und Werkzeug zum Verformen des Rohrendes von einem länglichen Durchschnitt zu einem kreisförmigen Durchschnitt

Country Status (3)

Country Link
EP (1) EP0574645B1 (de)
DE (1) DE69207755T2 (de)
ES (1) ES2082437T3 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11215406B2 (en) 2013-06-20 2022-01-04 Boustead International Heaters Limited Waste heat recovery units
US11318515B1 (en) 2021-02-08 2022-05-03 Sigma Corporation Large diameter pipe rounding tool and method of use

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101735273B1 (ko) 2015-10-07 2017-05-15 (주)디엠피테크 복열식 냉매튜브의 제조장치 및 이를 이용한 복열식 냉매튜브 제조방법
FR3056735B1 (fr) * 2016-09-28 2020-10-23 Valeo Systemes Thermiques Echangeur thermique, notamment pour vehicule automobile
FR3056736B1 (fr) * 2016-09-28 2019-07-26 Valeo Systemes Thermiques Faisceau d’echange thermique pour echangeur thermique, echangeur thermique et procede d’assemblage associes

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2767605A (en) * 1953-05-05 1956-10-23 Henry Edward Wiersch Hand tool for truing pipe ends
FR2462214A1 (fr) * 1979-07-26 1981-02-13 Ferodo Sa Procede de conformation d'un tube, en particulier pour echangeur de chaleur

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11215406B2 (en) 2013-06-20 2022-01-04 Boustead International Heaters Limited Waste heat recovery units
US11318515B1 (en) 2021-02-08 2022-05-03 Sigma Corporation Large diameter pipe rounding tool and method of use

Also Published As

Publication number Publication date
DE69207755T2 (de) 1996-06-20
DE69207755D1 (de) 1996-02-29
ES2082437T3 (es) 1996-03-16
EP0574645A1 (de) 1993-12-22

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