EP3141861A1 - Procédé de fabrication de boîtier de refroidisseur de recirculation de gaz d'échappement et panneau de boîtier correspondant - Google Patents

Procédé de fabrication de boîtier de refroidisseur de recirculation de gaz d'échappement et panneau de boîtier correspondant Download PDF

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Publication number
EP3141861A1
EP3141861A1 EP15184541.9A EP15184541A EP3141861A1 EP 3141861 A1 EP3141861 A1 EP 3141861A1 EP 15184541 A EP15184541 A EP 15184541A EP 3141861 A1 EP3141861 A1 EP 3141861A1
Authority
EP
European Patent Office
Prior art keywords
housing
parts
bending
surface part
exhaust gas
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Withdrawn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
EP15184541.9A
Other languages
German (de)
English (en)
Inventor
Kim Do YOUNG
Seo Hyoung JUN
Su Hwan Kim
Park Jun YOUNG
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.)
Sambo Motors
Original Assignee
Sambo Motors
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 Sambo Motors filed Critical Sambo Motors
Priority to EP15184541.9A priority Critical patent/EP3141861A1/fr
Publication of EP3141861A1 publication Critical patent/EP3141861A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/32—Liquid-cooled heat exchangers
    • 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
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
    • 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
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • F28D7/1684—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation the conduits having a non-circular cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2225/00—Reinforcing means
    • F28F2225/02—Reinforcing means for casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
    • F28F2255/08—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes pressed; stamped; deep-drawn

Definitions

  • Exemplary embodiments of the present invention relate to a cooler for an exhaust gas recirculation apparatus, and more particularly, to a method for manufacturing a housing which houses therein a cooler of an exhaust gas recirculation apparatus, and a structure of a panel as a part used to manufacture the housing.
  • an exhaust gas recirculation (EGR) apparatus is an apparatus which recirculates exhaust gas to an intake manifold of a combustion chamber so as to reduce emission of NOx, which is a kind of regulated emission material of exhaust gas, and thus reduces the temperature in the combustion chamber, thereby reducing generation of NOx.
  • EGR exhaust gas recirculation
  • Such an EGR apparatus includes an EGR valve which controls an EGR flow rate in response to operating conditions of an engine under the control of an engine control unit (ECU), and an EGR cooler which cools exhaust gas by means of heat exchange with coolant before the exhaust gas is recirculated to the intake manifold.
  • ECU engine control unit
  • EGR cooler which cools exhaust gas by means of heat exchange with coolant before the exhaust gas is recirculated to the intake manifold.
  • a conventional EGR cooler includes a cooling module 101 in a housing and is configured such that recirculation exhaust gas passes through the interior of the cooling module 101 and is cooled by means of heat exchange with coolant before being discharged to a combustion chamber.
  • the housing is manufactured in such a way that an upper housing 102 and a lower housing 103 are separately formed and then coupled to each other.
  • the upper housing 102 and the lower housing 103 are manufactured to have U shapes and then coupled to each other to form the housing having a rectangular frame shape.
  • each U-shaped housing having two corner parts 104 are manufactured in such a way that a planar panel is formed through a pressing process and then is bent twice through a bending process.
  • the bending process must be conducted twice to form the two corner parts 104. Therefore, torsion is increased by stress resulting from bending. Thereby, there is a problem of reduction in flatness. Particularly, since the degree of torsion varies whenever the housings are manufactured, the quality of products is not uniform.
  • the housing of the conventional EGR cooler may be easily twisted or deformed by residual stress generated when the pressing process is conducted. As a result, it is difficult to maintain the flatness, and the housings become vulnerable to external force or internal pressure.
  • an object of the present invention is to provide a method for manufacturing a housing of an exhaust gas recirculation cooler which can reduce torsion caused by stress and thus enhance the flatness and strength, and to a housing panel therefor.
  • the pre-upper surface part may include: a pair of first upper surface parts each integrally provided at a right angle on an edge of the corresponding pre-side surface part; and a second upper surface part provided between the pair of first upper surface parts, with an obtuse angle formed between the second upper surface part and each of the first upper surface parts by the corresponding bending part.
  • a bead part for deformation prevention may be formed in a depressed form in the pre-upper surface part of the housing.
  • the bead part may be formed in each of the bending parts.
  • the bead part may comprise bead parts formed in the respective first upper surface parts to be symmetrical with each other based on the second upper surface part.
  • a method for manufacturing a housing of an exhaust gas recirculation cooler includes: forming the housing panel; and flattening, through bending, the bending parts of the housing panel made in forming the housing panel.
  • a housing of an exhaust gas recirculation cooler that is manufactured according to the exemplary embodiment of the present invention is formed in a form of a thin rectangular frame in such a way that an upper housing 100 and a lower housing (not shown) are separately manufactured and then assembled with each other.
  • the upper housing 100 includes an upper surface part 110 and a pair of side surface parts 120.
  • the side surface parts 120 are formed to be perpendicularly bent from respective opposite edges of the upper surface part 110.
  • the upper surface part 110 and the side surface parts 120 generally form a 'U' shape.
  • Bead parts 130 are formed in the upper surface part 110 and the side surface parts 120 of the housing 100. As shown in FIG. 5 , the bead parts 130 are formed by depressing portions of outer surfaces of the upper surface part 110 and the side surface parts 120 in such a way that, as shown in the sectional view, each bead part 130 protrudes to a side opposite to the corresponding outer surface by a depth to which it is depressed. That is, for the upper surface part 110, the corresponding bead parts 130 each have a depression shape in an upper surface thereof and have a protrusion shape on a lower surface thereof. Each bead part 130 is formed such that the thickness of the cross-section thereof is the same as that of a portion surrounding the bead part 130. These bead parts 130 may be formed through a pressing process.
  • the bead parts 130 include a first bead 131 and a second bead 132, which is linear.
  • the first bead 131 is formed in a U shape along the perimeter of the upper surface part 110.
  • the second bead 132 is formed in a rod shape.
  • a pair of first beads 131 and a pair of second beads 132 are provided such that they are formed to be symmetrical with each other in the upper surface part 110 at positions spaced apart from each other by predetermined distances.
  • the bead parts 130 are formed in the upper surface part 110 and the side surface parts 120 in the transverse direction thereof and also formed linearly in the longitudinal direction thereof, whereby torsion attributable to stress can be reduced. Consequently, the flatness of each surface part can be enhanced, and the strength thereof against external force or internal pressure can be increased.
  • a housing panel 1 is formed by pressing a flat plate.
  • the housing panel 1 illustrated in FIG. 7 has a bent shape with two corner parts 30 and two bending parts 15.
  • the housing panel 1 includes a pair of pre-side surface parts 20 which form the respective side surface parts 120 of the upper housing 100, and a pre-upper surface part 10 which forms the upper surface part 110 of the upper housing 100.
  • the pre-upper surface part 10 includes a pair of first upper surface parts 11 each of which perpendicularly and integrally extends from an edge of the corresponding pre-side surface part 20, and a second upper surface part 12 which is provided between the first upper surface parts 11 with an obtuse angle formed between the second upper surface part 12 and each first upper surface part 11 by the corresponding bending part 15.
  • the first upper surface parts 11 and the second upper surface part 12 are integrally formed between the two pre-side surface parts 20.
  • the two bending parts 15, each of which has an obtuse angle, are formed at positions spaced apart from each other by a predetermined distance.
  • the second upper surface part 12 is formed in the same shape as the final shape of the upper surface part 110 of the upper housing 100.
  • the first upper surface parts 11 are bent around the bending parts 15 through a bending process so that the first upper surface parts 11 are level with the second upper surface part 12.
  • each corner part 30 at which the corresponding first upper surface part 11 is joined with the associated pre-side surface part 20 is formed at the right angle so that the side surface parts 120 and the upper surface part 110 of the upper housing 100 having a U shape can be formed. That is, each corner part 30 is formed at first at the right angle by pressing to have the same shape as the final shape of the corresponding part of the upper housing 100. Subsequently, when the bending process is performed, only the bending parts 15 other than the corner parts 30 are bent.
  • each first upper surface part 11 When each first upper surface part 11 is bent by an angle obtained by subtracting a bending angle ( ⁇ ) from 180°, the first upper surface parts 11 along with the second upper surface part 12 form the upper surface part 110 of the upper housing 100. In this case, the pre-side surface parts 20 along with the first upper surface parts 11 are also moved by the same angle.
  • a restoration angle ( ⁇ ) of each pre-side surface part 20 with respect to a pressing direction P depends on the bending angle ( ⁇ ) because the restoration angle ( ⁇ ) is a value obtained by subtracting the bending angle ( ⁇ ) from 180°. As the bending angle ( ⁇ ) is increased, the restoration angle ( ⁇ ) is reduced.
  • the bending angle ( ⁇ ) is reduced, the strain of each bending part 15 is increased. Thereby, effects of stress applied to the bending part 15 are increased, and there is the probability of fracture of the bending part 15. If the bending angle ( ⁇ ) is increased, the strain of each bending part 15 is reduced, but it becomes difficult to conduct the process of pressing the pre-side surface parts 20. Therefore, it is preferable that the restoration angle ( ⁇ ) of the pre-side surface parts 20 be comparatively large and the bending angle ( ⁇ ) of the first upper surface parts 11 be also comparatively large. For this, the second upper surface part 12 is provided between the two first upper surface parts 11.
  • the second upper surface part 12 is formed to have a predetermined bending angle ( ⁇ ) relative to each first upper surface part 11 by means of the corresponding bending part 15.
  • the two bending parts 15 are formed on opposite sides of the second upper surface part 12.
  • Each bending part 15 has a bending angle ( ⁇ ) of an obtuse angle.
  • the angle between each first upper surface part 11 and the second upper surface part 12 is an obtuse angle.
  • the bending angle ( ⁇ ) can be an obtuse angle close to 180°.
  • the bending angle ( ⁇ ) is an obtuse angle close to 180°
  • the angle to which each bending part 15 is bent can be reduced.
  • the strain of the bending part 15 can be reduced. Therefore, the durability of the bending part 15 can be enhanced, and the flatness thereof can also be increased.
  • the bead parts 130 for prevention of deformation are formed on the pre-upper surface part 10.
  • the first beads 131 of the bead parts 130 are formed on the respective first upper surface parts 11.
  • the second beads 132 are formed on the respective bending parts 15.
  • each second bead 132 has a rod shape extending along the corresponding bending part 15 so that the bending part 15 can be easily bent around the second bead 132. Since the second bead 132 has an arc-shaped cross-section, stress resulting from bending of the bending part 15 is dispersed to a wider area, whereby deformation can be reduced.
  • the bending process is conducted, as shown in FIG. 6B .
  • the two bending parts 15 formed on the pre-upper surface part 10 are bent to form the upper housing 100 having a U shape.
  • the bending process is a process of bending the bending parts 15 formed on the pre-upper surface part 10 such that the pre-upper surface 10 becomes planar.
  • the two corners 30 are maintained in the condition, in which they are bent at the right angle in the panel forming operation, without being separately bent. Therefore, the upper housing 100 can be formed by merely bending the bending parts 15 once.
  • the number of bending processes is reduced so that torsion caused by stress resulting from bending can be reduced.
  • torsion can be minimized by bead parts.
  • the flatness can be enhanced, the strength thereof against external force or internal pressure can be increased, and the stiffness against residual stress generated when a press process is conducted can be maintained.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
EP15184541.9A 2015-09-09 2015-09-09 Procédé de fabrication de boîtier de refroidisseur de recirculation de gaz d'échappement et panneau de boîtier correspondant Withdrawn EP3141861A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15184541.9A EP3141861A1 (fr) 2015-09-09 2015-09-09 Procédé de fabrication de boîtier de refroidisseur de recirculation de gaz d'échappement et panneau de boîtier correspondant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15184541.9A EP3141861A1 (fr) 2015-09-09 2015-09-09 Procédé de fabrication de boîtier de refroidisseur de recirculation de gaz d'échappement et panneau de boîtier correspondant

Publications (1)

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EP3141861A1 true EP3141861A1 (fr) 2017-03-15

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EP15184541.9A Withdrawn EP3141861A1 (fr) 2015-09-09 2015-09-09 Procédé de fabrication de boîtier de refroidisseur de recirculation de gaz d'échappement et panneau de boîtier correspondant

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EP (1) EP3141861A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1657512A1 (fr) * 2004-11-10 2006-05-17 Modine Manufacturing Company Echangeur de chaleur avec un profilé ouvert en tant que boîtier
DE102007049665A1 (de) * 2006-10-18 2008-05-15 Denso Corp., Kariya Wärmeaustauscher
FR2969269A1 (fr) * 2010-12-16 2012-06-22 Valeo Systemes Thermiques Echangeur de chaleur a plaques empilees.
EP2792988A1 (fr) * 2011-12-13 2014-10-22 Korens Co., Ltd. Échangeur de chaleur intégré pour un véhicule

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1657512A1 (fr) * 2004-11-10 2006-05-17 Modine Manufacturing Company Echangeur de chaleur avec un profilé ouvert en tant que boîtier
DE102007049665A1 (de) * 2006-10-18 2008-05-15 Denso Corp., Kariya Wärmeaustauscher
FR2969269A1 (fr) * 2010-12-16 2012-06-22 Valeo Systemes Thermiques Echangeur de chaleur a plaques empilees.
EP2792988A1 (fr) * 2011-12-13 2014-10-22 Korens Co., Ltd. Échangeur de chaleur intégré pour un véhicule

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