EP0761336A1 - Méthode et appareil de fabrication d'un collecteur - Google Patents

Méthode et appareil de fabrication d'un collecteur Download PDF

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Publication number
EP0761336A1
EP0761336A1 EP96113674A EP96113674A EP0761336A1 EP 0761336 A1 EP0761336 A1 EP 0761336A1 EP 96113674 A EP96113674 A EP 96113674A EP 96113674 A EP96113674 A EP 96113674A EP 0761336 A1 EP0761336 A1 EP 0761336A1
Authority
EP
European Patent Office
Prior art keywords
tool
collecting tube
pressure
manifold
tube
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.)
Granted
Application number
EP96113674A
Other languages
German (de)
English (en)
Other versions
EP0761336B1 (fr
Inventor
Rainer Baumann
Martin Rilk
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.)
Mahle Behr GmbH and Co KG
Original Assignee
Behr GmbH and Co KG
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 Behr GmbH and Co KG filed Critical Behr GmbH and Co KG
Publication of EP0761336A1 publication Critical patent/EP0761336A1/fr
Application granted granted Critical
Publication of EP0761336B1 publication Critical patent/EP0761336B1/fr
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
    • F28F9/18—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding
    • 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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B21D26/045—Closing or sealing means
    • 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
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/24—Perforating, i.e. punching holes
    • B21D28/28—Perforating, i.e. punching holes in tubes or other hollow bodies
    • 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
    • F28F9/0243—Header boxes having a circular cross-section

Definitions

  • the invention relates to a method for producing a one-piece manifold for a heat exchanger of the type specified in the preamble of claim 1 and a tool of the type specified in the preamble of claim 6.
  • EP 0 198 581 B1 describes a heat exchanger in which the ends of the parallel heat exchanger tubes are accommodated in header tubes.
  • slot-shaped openings are made in the wall of the collecting pipes, into which the ends of the heat exchanger pipes are inserted and soldered to the collecting pipe.
  • the wall of the collecting tube is designed in a dome shape, since it is necessary to pull the material of the collecting tube far into the collecting tube. This is the only way to ensure that the header pipe is properly seated on the flat sides of the ends of the heat exchanger pipes.
  • this configuration is only possible if there is a certain distance between the respective heat exchanger tubes. Such a design is not possible with small distances between adjacent heat exchanger tubes.
  • EP 0 484 789 B1 describes a method for producing an opening in the wall of a workpiece designed as a hollow body, the workpiece being inserted into a tool which is provided with a shape in the region of the opening provided.
  • the molding has an edge contour corresponding to the opening to be produced, so that when the workpiece is subjected to a corresponding internal pressure, the workpiece wall is cut into along the edge of the molding.
  • such a method is not suitable, and certainly cannot, to create a multiplicity of openings arranged close to one another in a tube wall passages surrounding the openings and directed towards the center of the pipe are produced.
  • the present invention is therefore based on the object of providing a method for producing a one-piece manifold for a heat exchanger of the generic type, by means of which openings and passages which are precisely shaped can be produced in a simple manner, regardless of the cross-sectional shape of the manifold.
  • the object is to provide a tool of the type mentioned in the preamble of claim 6, through which a manifold with precisely shaped openings and passages for a heat exchanger can be produced in a simple manner while reducing tool wear.
  • the main advantages of the invention can be seen in the fact that support is provided in the interior of the tube in a simple manner and regardless of the tube shape by pressurization, so that the contour of the collecting tube remains unchanged.
  • the openings created in the tube wall and the passages surrounding them have an extremely exact contour corresponding to the outer circumference of the heat exchanger tubes, which leads to an increase in the manufacturing quality in the manufacture of the heat exchanger. Since a pressure fluid is used for internal support when the punches are pressed into the manifold, there are no grooves, as is the case with the known arrangements with axially demoldable inner matrices.
  • the collecting tube is received in the tool mold for the pressing in of the punches, it is possible in a simple manner to produce an annular shape extending in the circumferential direction on the collecting tube near the end of the tool tube.
  • the end of the collecting tube can simultaneously serve as a hose connection for a coolant hose or the like. If a partition wall running transversely to the longitudinal direction is arranged in the collecting tube and one section of the collecting tube serves as an inlet and the other section serves as an outlet, both ends of the collecting tube can of course be provided with corresponding annular shapes.
  • These annular shapes are preferably produced by compressing a plastic part, the radially outward pressing force of the plastic part pressing the tube wall into a corresponding recess in the mold.
  • a sufficient internal pressure is required for the internal support of the collecting tube when the punches are pressed in, the level of the internal pressure depending on several parameters.
  • the internal pressure can be between 2 M Pa (20 bar) and 50 M Pa (500 bar).
  • the application of an internal pressure between 4 M Pa and 10 M Pa is considered to be particularly suitable.
  • the invention can be implemented with manifolds of different cross-sections, but in practice cylindrical tube shapes are of the greatest importance. It is therefore expedient to make the receiving space cylindrical in the tool shape. So that the annular bead can be produced at the end of the collecting tube with the tube inserted in the tool mold, an annular recess running in the circumferential direction is provided on at least one end of the receiving space at a short distance from the end face of the collecting tube.
  • the tool shape is formed in two parts, an upper tool part and a lower tool part having two identical, but mirror-image, configurations for jointly forming the receiving space.
  • the punches are mounted in guide openings in the upper part of the tool, this mounting being as free of play as possible and only a lubricating film sufficient for the lubrication of the moving parts must be made possible.
  • the actuating element for the punches is arranged, which is preferably designed as a pressure plate in which the punches are held non-positively in the direction of the working stroke. So that the depth of penetration of the punches into the collecting tube is limited, it is expedient that the distance of the working stroke is determined by the maximum distance between a contact surface of the actuating element and a stop surface of the upper part of the tool.
  • the shape of the openings in the header is determined by the cross-sectional shape of the heat exchanger tubes that are connected to the header.
  • stamps with an elongated cross-sectional shape with parallel side surfaces and rounded narrow sides must therefore be provided in the tool for producing the header pipe.
  • the shape of the stamp must of course be designed accordingly.
  • the front end of the punch In order to limit the force required when the punches are pushed into the tube wall, it is advantageous to design the front end of the punch as a tip with inclined surfaces extending to the rounded narrow sides of the cross-sectional shape.
  • a bevel directed towards the tip is provided on the side faces of the punch.
  • a plug which can be inserted axially into the end of the collecting tube is provided for this purpose.
  • a plug can have a conical outer surface, for example, and preferably consists of a plastic or rubber material at least in the region of the outer surface. Due to the conical outer surface, the exact diameter is not important, since such a shape always centers itself until the outer surface of the stopper fits over the entire circumference of the collecting tube end.
  • the plug can also be cylindrical and provided with an annular seal. It is considered particularly expedient that the stopper comprises an elastic ring element which is arranged between two end clamping elements and can be expanded radially by the application of axial force.
  • a pressure medium line attached to the stopper is preferably used to supply the pressure fluid.
  • the end of the pressure medium line can be guided through the stopper to the side of the stopper facing the interior of the collecting tube. If the pressure medium line is not completely led through the plug, the pressure medium line is connected to the interior of the header pipe by a bore in the plug.
  • FIG. 1 shows a tool mold 1, which comprises an upper tool part 2 and a lower tool part 3, each with formations 4, 4 'arranged therein, these formations 4, 4' together forming a receiving space 15 for a manifold 5.
  • the parting plane of the mold 1 runs at the height of the center line M of the collecting tube or the receiving space 15 formed by the formations 4, 4 '.
  • An end view of the mold 1 without an inserted collecting tube is shown in FIG. 11. From this illustration it can be seen that the Formation 4 in the upper tool part 2 and the formation 4 'in the lower tool part 3 are identical and together form the receiving space 15, which has a cylindrical shape.
  • the division plane T between the upper tool part 2 and the lower tool part 3 is located at the level of the central axis M of the receiving space 15.
  • the punches 10 have a front end 12 which is at a short distance from the receiving space 15 or the wall of the collecting tube 5 located therein.
  • the guide openings 11 and the punches 10 have an elongated cross-sectional shape with two parallel flat sides, as is evident from the view rotated by 90 ° in FIG. 11 in connection with FIG. 1.
  • the stamps 10 each have a section 13 which is remote from the front end 12 and is held in a pressure-locking manner in a pressure plate 14.
  • the arrow 17 indicates the direction in which the pressure plate 14 carries out a working stroke with the stamps 10 attached thereto, the distance of the maximum working stroke being indicated by S.
  • This distance S is determined by a contact surface 18 on the pressure plate 14 and a stop surface 19 opposite this on the upper tool part 2.
  • the interior 7 of the collecting tube 5 is filled with a pressure fluid and an internal pressure of between 2 M Pa and 50 M Pa, preferably approximately 4 M Pa to 10 M Pa, is built up.
  • This internal pressure supports the tube wall of the collecting tube 5 against the plunger 10 acting radially on the collecting tube 5, so that the tube wall essentially retains its shape and only the area of the openings to be manufactured is deformed.
  • an inward passage 20 is formed which, due to the internal pressure in the collecting tube 5, lies against the peripheral surface of the stamp 10 and remains in contact with it. In this way, no pressure fluid can escape from the interior 7 when the punches 10 penetrate, so that the internal pressure is maintained.
  • FIG. 3 shows a section through the end section of the collecting tube 5 while the punches 10 are being pressed in.
  • a stopper 23 which comprises an inner sleeve 21 and a support sleeve 22 arranged concentrically thereon and a ring element 24 made of an elastic material, for example a rubber or plastic material.
  • the support sleeve 22 has a radial shoulder 25 with which the support ring 22 is supported on the mold 1.
  • the inner sleeve 21 projects through the support sleeve 22 and has a radial collar 26 located within the collecting tube 5, the ring element 24 being arranged between the front end of the inner sleeve 21 and the radial collar 26.
  • the support sleeve 22 can be displaced relative to the inner sleeve 21 to a limited extent in the direction of the arrow 27, as a result of which the distance between the radial surfaces which act on the ring element 24 in the axial direction is increased. This corresponds to the state of the plug 23 before insertion into the front end of the collecting tube 5. Since the ring element 24 is relaxed in this state, this ring element has a diameter that corresponds to the inside diameter of the collecting tube 5.
  • the plug 23 can be easily inserted until the radial shoulder 25 abuts the upper tool part 2 and lower tool part 3.
  • the ring element 24 By axially displacing the inner sleeve 21 against the direction of arrow 27, the ring element 24 is acted upon in the axial direction, so that the material of the ring element 24 tries to evade radially outward. Since the ring element 24 is located in a plane with respect to the longitudinal extent of the receiving space 15, in which the receiving space 15 has the annular recess 16, the force acting radially from the ring element 24 on the tube material causes the collecting tube to widen in the region of the recess 16, so that the tube wall can be pressed into the recess 16 and the annular shape 6 is formed. This corresponds to the position shown in FIG. 3.
  • the inner sleeve 21 has an axial pressure medium channel 28, which is connected to a pressure medium line 50 and can be fed through the pressure fluid from a reservoir 52 by means of a pump 51 into the interior 7 of the manifold 5. Apart from the pressure medium channel 28, the interior 7 of the manifold 5 is completely closed, so that the pressure required for the internal support of the manifold can be built up. Since the plug 23 is in the position shown in FIG. 3 during the pressure build-up and the pressure holding phase, the ring element 24 ensures a reliable seal against the escape of the pressure fluid.
  • the pressure plate 14 As soon as sufficient pressure is built up in the interior 7 of the collecting tube 5, the pressure plate 14 is moved in the direction of the arrow 17, as a result of which the punches 10 with their front ends Ends 12 are pushed into the collecting tube. Due to the internal pressure, the tube wall of the collecting tube is supported so that only the openings with the passages 20 surrounding it are produced. Before the pressure plate 14 and the punches 10 perform a working stroke in the opposite direction of the arrow 17, the pressure in the collecting pipe is reduced and the pressure fluid is returned to an appropriate reservoir, if necessary. Only then is the punch 10 pulled out of the manifold 5 and the mold 1 opened, so that the manifold can be ejected from the mold.
  • FIG. 4 shows the top view of a collecting tube 5 with a design 6 arranged near each end of the collecting tube and a plurality of slot-like openings 29 which are arranged at equal intervals, parallel to one another and orthogonal to the longitudinal direction of the collecting tube.
  • the distance between the respective outer opening 29 and the respective end face of the collecting tube 5 can be chosen as desired and is essentially determined by the installation conditions of the heat exchanger, the position and direction of the connecting pieces and the like.
  • FIG. 5 shows a section along the line V - V in FIG. 4. It can be seen from this that the collecting tube 5 has a circular cross section and the opening 29 extends in a crescent shape over a certain arc angle in the tube wall.
  • the arc angle ⁇ is approximately 70 °, but slot-like openings 29 with an arc angle of up to approximately 150 ° are also possible.
  • the passage 20 extends along the edge of the openings 29, the contour of which is also sickle-shaped along the parallel side faces.
  • an inner circumferential surface 30 is designed as a contact surface for a heat exchanger tube to be inserted later.
  • a radially inner edge 32 of the passage 20 is in turn slightly widened, so that a soldering meniscus forms on the inside of the passage 20 on the heat exchanger tube which will later be inserted into the collecting tube 5.
  • Fig. 6 shows a section along the line VI - VI in Fig. 5. It can be seen that the outer contour of the collecting tube 5 is completely flat and is only interrupted by the openings 29 made in the tube wall. The passages 20 of the openings 29 have the same contour with surfaces 30 and the enlarged edge 32 directed into the interior of the tube, as has already been described for FIG. 5.
  • FIG. 7 shows an embodiment variant of FIG. 5 with an end of a heat exchanger tube 43 inserted into the slot-like opening 29.
  • a passage 33 is provided which surrounds the slot-like opening 29 and has a compression 34 projecting beyond the outer surface of the tube wall.
  • the passage 33 does not have a section with parallel surfaces, but rather a curved contour which comes into contact with the outer surface of the heat exchanger tube 43. Both on the inside of the collecting tube 5 and on the outside, distinct soldering masks are formed by the shape of the passage 33.
  • FIG. 8 shows the front end 12 of the stamp 10, which is formed on a stamp shaft 39 and has a tip 35 which extends in the direction of the narrow sides 36, 36 ' Inclined surfaces 37 which include an obtuse angle ⁇ between them.
  • a section 38 with an axial contour adjoins the inclined surfaces 37, this axial section orthogonally to the longitudinal axis of the punch 10 having a somewhat smaller width than the extent of the side faces between the narrow sides 36 and 36 'of the punch shaft 39.
  • Between the section 38 and A stamp 40 is formed on the stamp shaft 39, which has a more or less pronounced bevel on the outside of the passage in accordance with the desired contour.
  • FIG. 9 shows a view in the direction of arrow IX of FIG. 8, from which it can be seen that the stamp 10 has a flat cross-sectional shape.
  • the punch shaft 39 is provided on parallel side surfaces 41 with bevels 42 extending to the tip 35, these bevels enclosing an angle ⁇ ⁇ 40 ° between them. In the exemplary embodiment in FIG. 9, the angle ⁇ is approximately 20 °.
  • FIG. 10 shows an arrangement similar to that in FIG. 2.
  • a plug 44 with a conical outer surface 45 is used in FIG. 10 for the pressure-tight closing of the collecting tube 5, as a result of which the plug 44 centers itself when it is inserted into the end face of the collecting tube 5 and that securely closes the end of the header pipe.
  • the plug 44 is attached to the end of a pressure medium line 46, so that the pressure medium line opens directly into the interior 7 of the collecting tube 5.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Punching Or Piercing (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
EP96113674A 1995-09-06 1996-08-27 Méthode et appareil de fabrication d'un collecteur Expired - Lifetime EP0761336B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19532860A DE19532860A1 (de) 1995-09-06 1995-09-06 Verfahren und Werkzeug zur Herstellung eines einstückigen Sammelrohres
DE19532860 1995-09-06

Publications (2)

Publication Number Publication Date
EP0761336A1 true EP0761336A1 (fr) 1997-03-12
EP0761336B1 EP0761336B1 (fr) 1999-11-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP96113674A Expired - Lifetime EP0761336B1 (fr) 1995-09-06 1996-08-27 Méthode et appareil de fabrication d'un collecteur

Country Status (4)

Country Link
US (1) US5737952A (fr)
EP (1) EP0761336B1 (fr)
DE (2) DE19532860A1 (fr)
ES (1) ES2138279T3 (fr)

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EP0844035A1 (fr) * 1996-11-20 1998-05-27 Daimler-Benz Aktiengesellschaft Méthode de fabrication des ouvertures allongées dans des profilés creux et dispositif pour l'exécution de cette méthode
WO2000055561A1 (fr) * 1999-03-15 2000-09-21 Behr Gmbh & Co. Tube collecteur pour echangeur de chaleur et son procede de fabrication
CN103639274A (zh) * 2013-12-26 2014-03-19 云南烟草机械有限责任公司 一种四柱油压方管冲孔设备
EP3520921A1 (fr) * 2018-02-01 2019-08-07 Piristeel Oy Procédé de fabrication d'un barreau d'échelle antidérapant et barreau d'échelle

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US5898996A (en) * 1997-09-05 1999-05-04 General Motors Corporation Method of forming a cylindrical heat exchanger header tank
US6109344A (en) * 1998-05-18 2000-08-29 Lattimore & Tessmer, Inc. Heat exchanger with an integrated tank and head sheet
US6179049B1 (en) * 1998-05-18 2001-01-30 Lattimore & Tessmer, Inc. Heat exchanger with an integrated tank and head sheet
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US6257035B1 (en) * 1999-12-15 2001-07-10 Ti Corporate Services Limited Compressive hydroforming
DE10043024B4 (de) * 2000-09-01 2005-12-01 Audi Ag Verfahren zum Innenhochdruckumformen eines Hohlprofiles
DE60100617T2 (de) * 2000-10-06 2004-06-09 Visteon Global Technologies, Inc., Dearborn Herstellung eines Rohres für einen Wärmetauscher
US6442820B1 (en) 2000-10-26 2002-09-03 F & P Mfg., Inc. Method and apparatus for forming a tube having an article inserted therein
DE10056074B4 (de) 2000-11-07 2017-03-23 Mahle International Gmbh Wärmeübertrager
DE10103176B4 (de) * 2001-01-22 2010-06-02 Behr Gmbh & Co. Kg Verfahren zum Einbringen von Flachrohreinsteckschlitzen in ein Sammelrohr
US20030145708A1 (en) * 2001-10-11 2003-08-07 Presby David W. Method, apparatus and actuatable perforator for creating apertures in pipe and pipe produced thereby
US6651327B1 (en) 2001-12-10 2003-11-25 Dana Corporation Method of making hydroformed fuel rails
US6591648B1 (en) * 2002-06-24 2003-07-15 Greenville Tool & Die Company Method of stamping and piercing a tube
JP4616262B2 (ja) * 2003-10-02 2011-01-19 ベール ゲーエムベーハー ウント コー カーゲー 自動車用給気冷却器
US6931901B2 (en) * 2003-10-21 2005-08-23 General Motors Corporation Method and apparatus for forming a threaded hole in a hydroformed part
SE526316C2 (sv) * 2003-12-09 2005-08-23 Nexplo Bofors Ab Sätt och anordning för framställning av drivknut för laddningar med hög laddensitet och hög progressivitet
US6915672B1 (en) * 2004-03-12 2005-07-12 General Motors Corporation Hydrotapping power unit
US7284403B2 (en) * 2004-12-28 2007-10-23 Torque-Traction Technologies Llc Apparatus and method for performing a hydroforming process
SE528938C2 (sv) * 2005-02-08 2007-03-20 Ortic Ab Hydroformningsenhet
KR100599338B1 (ko) * 2005-07-05 2006-07-19 모딘코리아 유한회사 헤더파이프 제조방법과, 헤더탱크 및 이를 포함한 열교환기
EP1775540B1 (fr) 2005-10-12 2015-12-23 MAHLE Behr GmbH & Co. KG Collecteur pour échangeur de chaleur
DE102011013209A1 (de) 2011-03-05 2012-09-06 Modine Manufacturing Co. Herstellungsverfahren für Schlitze und Schlitzwerkzeug
US9308664B2 (en) * 2012-07-12 2016-04-12 Modine Manufacturing Company System and method for producing apertures in tubes
CN102950220A (zh) * 2012-10-27 2013-03-06 安徽多达皖晶新能源有限公司 一种导流管的导流孔加工定位装置
ITUA20162257A1 (it) * 2016-04-01 2017-10-01 Bertini Macch S R L Macchina per la formatura e per la sagomatura di un tubolare metallico, come un tubo
US20170370658A1 (en) 2016-06-23 2017-12-28 Modine Manufacturing Company Heat Exchanger and Header for the Same
EP3290848B1 (fr) * 2016-09-02 2020-05-06 Modine Manufacturing Company Collecteur pour un échangeur de chaleur et son procédé de fabrication
JP6990487B2 (ja) * 2017-07-28 2022-01-12 三桜工業株式会社 パイプ端部加工装置
CN108787846B (zh) * 2018-05-31 2020-06-02 安徽扬子职业技术学院 一种高强度汽车底盘零部件的精准成型装置

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DE4334203A1 (de) * 1992-10-20 1994-04-21 Behr Gmbh & Co Werkzeug zum Einbringen von Durchzügen in ein Sammelrohr eines Wärmetauschers
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Publication number Priority date Publication date Assignee Title
EP0844035A1 (fr) * 1996-11-20 1998-05-27 Daimler-Benz Aktiengesellschaft Méthode de fabrication des ouvertures allongées dans des profilés creux et dispositif pour l'exécution de cette méthode
US6212982B1 (en) 1996-11-20 2001-04-10 Daimlerchrysler Ag Process for manufacturing slot-shaped openings on hollow sections and apparatus for implementing same
WO2000055561A1 (fr) * 1999-03-15 2000-09-21 Behr Gmbh & Co. Tube collecteur pour echangeur de chaleur et son procede de fabrication
US6993838B1 (en) 1999-03-15 2006-02-07 Behr Gmbh & Co. Collector tube for a heat transfer unit and method for producing same
CN103639274A (zh) * 2013-12-26 2014-03-19 云南烟草机械有限责任公司 一种四柱油压方管冲孔设备
CN103639274B (zh) * 2013-12-26 2016-05-11 云南烟草机械有限责任公司 一种四柱油压方管冲孔设备
EP3520921A1 (fr) * 2018-02-01 2019-08-07 Piristeel Oy Procédé de fabrication d'un barreau d'échelle antidérapant et barreau d'échelle

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ES2138279T3 (es) 2000-01-01
US5737952A (en) 1998-04-14
EP0761336B1 (fr) 1999-11-10
DE59603615D1 (de) 1999-12-16
DE19532860A1 (de) 1997-03-13

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