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WO2018147376A1 - Tuyau perforé plat extrudé en aluminium présentant d'excellentes propriétés de brasage, et son procédé de production - Google Patents

Tuyau perforé plat extrudé en aluminium présentant d'excellentes propriétés de brasage, et son procédé de production Download PDF

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Publication number
WO2018147376A1
WO2018147376A1 PCT/JP2018/004424 JP2018004424W WO2018147376A1 WO 2018147376 A1 WO2018147376 A1 WO 2018147376A1 JP 2018004424 W JP2018004424 W JP 2018004424W WO 2018147376 A1 WO2018147376 A1 WO 2018147376A1
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WO
WIPO (PCT)
Prior art keywords
aluminum
tube
brazing
flat multi
hole
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.)
Ceased
Application number
PCT/JP2018/004424
Other languages
English (en)
Japanese (ja)
Inventor
中村　真一
尚希 山下
英敏 熊谷
永尾　誠一
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.)
UACJ Corp
UACJ Extrusion Corp
Original Assignee
UACJ Corp
UACJ Extrusion Corp
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 UACJ Corp, UACJ Extrusion Corp filed Critical UACJ Corp
Priority to JP2018567494A priority Critical patent/JPWO2018147376A1/ja
Priority to DE112018000796.0T priority patent/DE112018000796T5/de
Priority to CN201880011508.8A priority patent/CN110290882B/zh
Publication of WO2018147376A1 publication Critical patent/WO2018147376A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
    • B23K1/0012—Brazing heat exchangers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/22—Making metal-coated products; Making products from two or more metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C25/00—Profiling tools for metal extruding
    • B21C25/02—Dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles 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
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/19—Soldering, e.g. brazing, or unsoldering taking account of the properties of the materials to be soldered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/28—Selection of soldering or welding materials proper with the principal constituent melting at less than 950 degrees C
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/022—Tubular elements of cross-section which is non-circular with multiple channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/084—Heat exchange elements made from metals or metal alloys from aluminium or aluminium alloys
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/089—Coatings, claddings or bonding layers made from metals or metal alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/04—Tubular or hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/04—Tubular or hollow articles
    • B23K2101/14—Heat exchangers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/08—Non-ferrous metals or alloys
    • B23K2103/10—Aluminium or alloys thereof
    • 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
    • F28D1/04—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 tubular conduits
    • F28D1/053—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 tubular conduits the conduits being straight
    • F28D1/0535—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 tubular conduits the conduits being straight the conduits having a non-circular cross-section
    • F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
    • 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
    • F28F2255/16—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes extruded

Definitions

  • the present invention relates to an aluminum extruded flat multi-hole tube having excellent brazing properties and a method for producing the same, and in particular, it can be suitably used as a heat exchanger, in particular, a heat transfer tube of an automotive heat exchanger such as a car air conditioner.
  • Aluminum extruded flat multi-holes for heat exchangers with stable and uniform brazing by providing a brazing material part stably and inexpensively to the outer peripheral part of an aluminum extruded flat multi-hole pipe to which fins are brazed and joined It relates to a tube and a method for producing it advantageously.
  • an aluminum extruded flat multi-hole tube having a flat cross-sectional shape as a whole obtained by extrusion processing of an aluminum material has been used as a refrigerant passage tube in an automobile heat exchanger, and refrigerant is introduced into the refrigerant passage tube.
  • the heat exchanger is constructed by assembling and brazing and fixing aluminum fins in a direction perpendicular to the refrigerant passage tube while allowing air as a heat exchange fluid to flow along the fins. By flowing, heat exchange is performed between the refrigerant and the air.
  • aluminum fins made of a brazing sheet clad with an Al-Si alloy brazing material are used, and this is used for flux brazing or vacuum brazing.
  • it is assembled by brazing and joining by fluxless brazing such as atmospheric brazing.
  • the fin material is changed from a brazing sheet to a bare material, contrary to the conventional case. If the brazing material can be coated, further thinning of the fin material can be expected.
  • the present situation is that a method for stably and inexpensively coating a brazing material on an aluminum extruded flat multi-hole tube on an industrial scale has not been established.
  • the brazing material coating on the aluminum extruded flat multi-hole tube after the aluminum extruded flat multi-hole tube is immersed in a mixture of flux and silicon metal powder, or the mixture is applied. , By heating and drying, the mixture is applied to the outer surface of an aluminum extruded flat multi-hole tube, combined with the bare material, and heated in a brazing furnace to be alloyed.
  • JP-A-10-258356 discloses such an aluminum extruded flat multi-hole tube.
  • a technique has been proposed in which a brazing material is clad in a hole tube during extrusion.
  • the clad brazing filler metal layer is wound around both end edges of the aluminum extruded flat multi-hole tube, and the brazing filler metal layer is liable to be caught.
  • a composite billet composed of an aluminum core material forming material and a skin material forming material made of an Al—Si based aluminum brazing alloy material is simultaneously extruded.
  • a method of manufacturing a clad pipe in which a brazing filler metal layer is clad with respect to the outer flat part of the pipe peripheral wall part has been proposed. Even in such a clad pipe, the metal flow of the skin material forming material is proposed.
  • the brazing filler metal layer is caught in the welded part, and there is an inherent problem such as defective winding. Met.
  • the present inventors As a result of intensive investigations to stably and inexpensively provide an Al-Si brazing filler metal layer that forms molten brazing on the surface, as an aluminum material to be extruded, an ordinary aluminum tube body material and an Al-Si alloy
  • the aluminum brazing material made of Al—Si alloy is advantageously exposed to the outer peripheral portion of the obtained aluminum extruded flat multi-hole tube by simultaneously extruding the aluminum brazing material comprising It was found that the aluminum tube body material and Al-Si which are hot extruded By installing a predetermined front plate in the forward direction of the composite billet in combination with an aluminum brazing material composed of the above, a brazing material layer is effectively restrained from entraining at both ends of the extruded flat multi-hole tube.
  • the object of the present invention is to provide an aluminum extruded flat multi-hole tube having excellent outer surface brazing properties at a simple and low cost, and another object is to provide aluminum that can exhibit such excellent characteristics.
  • An object of the present invention is to provide a method for advantageously producing an extruded flat multi-hole tube.
  • the present invention is an extruded tube having a flat cross-sectional shape as a whole obtained by extrusion of an aluminum material, and is independent of each other in the tube axis direction.
  • Aluminum extrusion flat multi-holes having a plurality of flow paths extending in parallel and arranged in the longitudinal direction of a flat cross-sectional shape via internal partition walls extending in the tube axis direction.
  • the tube is formed by extrusion using an aluminum tube main body material and an aluminum brazing material made of an Al-Si based aluminum alloy as the aluminum material, and at least over the entire outer peripheral wall portion of the tube.
  • the gist of the present invention is an aluminum extruded flat multi-hole tube having excellent brazing characteristics characterized by being present in the above ratio.
  • the aluminum brazing material contains Si: 1.0 to 13.0% by mass, Further, Mn: 1.4 mass% or less, Cr: 0.05 to 0.30 mass%, Zr: 0.05 to 0.30 mass%, Ti: 0.05 to 0.30 mass%, and Sr: 0
  • An aluminum alloy containing one or more of 0.0001 to 0.1% by mass and the balance being aluminum and unavoidable impurities is used.
  • the aluminum tube body material is Cu: 0.7 Containing 0.3% by mass or less and Mn: 1.4% by mass or less, Cr: 0.05 to 0.30% by mass, Zr: 0.05 to 0.30% by mass, Ti: 0.05 to 0.3%. 30% by mass and Sr: 0.0001- Containing one or more of .1 wt%, so that the aluminum alloy the remainder being aluminum and inevitable impurities is used.
  • the aluminum material to be extruded is composed of the aluminum tube main body material and the aluminum brazing material.
  • a composite billet will be used.
  • the composite billet is a core billet made of the aluminum tube main body material, and a sheath billet made of the aluminum brazing material located around the core billet. Has an integral core-sheath structure.
  • the extruded tube is formed by extrusion of the aluminum material using a porthole die. ing.
  • a composite composed of an aluminum tube main body material and an aluminum brazing material made of an Al—Si based aluminum alloy is used.
  • a front plate made of the same material as the aluminum tube body material is used together with the billet, and the diameter of the front plate is set to 90% or more and 100% or less with respect to the diameter of the composite billet, and the thickness of the front plate is further increased.
  • the front plate is arranged on the front side in the extrusion direction of the composite billet, and the front plate and the composite billet are connected to the port hole die.
  • the gist of the present invention is also a method for producing an aluminum extruded flat multi-hole tube having excellent brazing properties characterized by being extruded together.
  • the composite billet is positioned around the core billet, the core billet made of the aluminum tube main body material. It has an integral core-sheath structure consisting of a sheath billet made of an aluminum brazing material.
  • this invention is comprised including the aluminum extrusion flat multi-hole pipe
  • the gist of the present invention is also an aluminum heat exchanger.
  • a brazing material portion made of an aluminum brazing material is provided over the entire outer periphery of the tube or at least a part of the flat portion of the outer periphery of the tube.
  • As a heat transfer tube it can be advantageously used.
  • the aluminum extruded flat multi-hole tube according to the present invention is composed of an aluminum tube main body material and an aluminum brazing material, and is formed directly by simultaneous extrusion of these two materials.
  • the brazing performance can be effectively demonstrated in the aluminum brazing material while ensuring the characteristics of the aluminum tube main body material. There is also an advantage that can be advantageously increased.
  • the extrusion direction of a composite billet composed of an aluminum tube main body material and an aluminum brazing material made of an Al—Si based aluminum alloy Effectively suppresses or prevents the aluminum brazing material from being caught in the aluminum tube body material because it is extruded from the port hole die in a state where a predetermined front plate is disposed in front.
  • the aluminum extruded flat multi-hole having a stable quality in terms of brazing without the brazing filler metal layer being wound around both ends of the extruded flat multi-hole tube thus obtained.
  • the tube could be advantageously obtained.
  • an aluminum heat exchanger constructed by assembling an aluminum extruded flat multi-hole tube according to the present invention and an aluminum outer fin (bare fin) and joining them by brazing heating, the aluminum
  • the brazing and fixing of the aluminum outer fin can be advantageously realized, and the intended heat exchanger can be obtained easily and inexpensively.
  • FIG. 1 schematically shows an example of an aluminum extruded flat multi-hole pipe according to the present invention in the form of a cross section that is a cross section perpendicular to the longitudinal direction (tube axis direction).
  • the flat multi-hole tube 10 according to the present invention is an extruded tube of an aluminum material having a flat cross-sectional shape as a whole as shown in FIG. And a plurality of rectangular flow paths 12 extending in parallel with each other, and the plurality of flow paths 12 are arranged at predetermined intervals in a flat longitudinal direction (left-right direction in the drawing) that is a tube width direction. It is a structure that is damped.
  • the upper and lower surfaces of the flat multi-hole tube 10 facing each other are flat surfaces, and there are outer fins (not shown) such as plate fins and corrugated fins as bare fins. Used to be attached by a brazing joint technique and can be used as a heat exchanger.
  • the cross-sectional shape of the flow path 12 is a rectangular shape here, it is possible to adopt a known circular shape, an elliptical shape, a triangular shape, or a combination of these shapes. Is possible.
  • the internal partition located between the adjacent flow paths 12 and 12 is used. While the periphery of the flow path 12 including the portion 16 is made of a normal aluminum tube main body material, a flat surface that gives at least the flat surface of the tube outer peripheral wall portion 14 out of the entire circumference of the tube outer peripheral wall portion 14. A layer of a brazing filler metal portion 18 made of an aluminum brazing material is present in a part of the portion, and this brazing filler metal portion 18 is formed on at least a part of the outer peripheral surface of the pipe outer peripheral wall portion 14 (here, on the entire outer peripheral surface). ), It can be exposed.
  • the brazing filler metal component of the aluminum brazing material constituting the brazing filler metal portion 18 is used to exhibit excellent brazing properties.
  • the flat multi-hole tube 10 can be obtained.
  • the brazing filler metal part 18 as described above is exposed on the outer surface side of at least a part of the pipe outer peripheral wall part 14 of the flat part (flat surface) of the total length L of the pipe in the cross section of the flat multi-hole pipe 10.
  • the exposure range is desirably configured to be exposed in a range corresponding to 50% or more and 100% or less of the total circumference L of the tube, preferably 60% or more, and more preferably 70%. % Or more will be advantageously employed.
  • the brazing filler metal portion 18 is exposed over a predetermined area of the entire circumference L of the pipe on the outer peripheral surface of the flat multi-hole pipe 10, so that the aluminum brazing material contributing to brazing is stable. In particular, as shown in FIG.
  • the brazing filler metal portion 18 is present over the entire circumference L of the pipe as the most preferable state. Is the case. If the exposed area is less than 50% of the circumferential length L of the pipe outer peripheral wall portion 14, there is a concern that defects such as unbonded fins or peeling off of the fins may occur during brazing heating. Further, it is not necessary to make all the thicknesses of the exposed regions of the brazing filler metal portion 18 in the entire circumference L of the pipe, for example, as shown in FIG. It is also possible to expose the material part 18. Further, it is desirable that such a brazing filler metal portion 18 is continuously exposed with respect to the entire circumference L of the pipe, but is also partially discontinuous or at a predetermined length. Even if it is exposed in a form extending in the pipe axis direction at a plurality of positions in the pipe circumferential direction, there is no problem.
  • a normal aluminum tube body material is present around the path 12.
  • the pipe outer peripheral wall portion 14 constitutes the outer peripheral wall of the flat multi-hole tube 10 as shown in the figure, and functions as an external partition for each flow path 12.
  • the thickness Ta is determined by the pipe outer peripheral wall. It is present at a ratio of 90% or less, desirably 80% or less of the thickness Ts of the portion 14, and the lower limit thereof is preferably 1% or more, more preferably 5% or more. It will be. That is, Ta ⁇ 0.9 ⁇ Ts, and Ta ⁇ 0.01 ⁇ Ts is preferable.
  • the brazing filler metal portion 18 exceeds 90% of the thickness Ts of the pipe outer peripheral wall portion 14, the brazing filler metal portion 18 melts during brazing heating, and the thickness of the pipe outer peripheral wall portion 14 becomes too thin. This causes problems such as a decrease in pressure resistance as the flat multi-hole tube 10.
  • the brazing filler metal portion 18 configuring the brazing filler metal portion 18 to be positioned on the outer surface side of the pipe outer peripheral wall portion 14, the aluminum brazing material is exposed and present on the outer surface of the pipe outer peripheral wall portion 14. As a result, the outer brazing performance can be advantageously exhibited.
  • an Al—Si based aluminum alloy is used as the material of the aluminum brazing material constituting the brazing filler metal portion 18, but Si: 1.0 to 13.0 mass%, Mn: 1.4 mass% or less (excluding 0 mass%), Cr: 0.05 to 0.30 mass%, Zr: 0.05 to Containing at least one of 0.30% by mass, Ti: 0.05-0.30% by mass and Sr: 0.0001-0.1% by mass with the balance being aluminum and inevitable impurities (for example, Cu, An aluminum alloy such as Zn or Fe is used.
  • Si content exceeds 13.0% by mass, the melting point rapidly decreases, and there is a concern that the base material is melted during brazing heating.
  • the aluminum tube main body material that is a material other than the aluminum brazing material that constitutes at least a part of the outer peripheral wall portion 14 of the tube
  • a flat multi-hole tube by extrusion has been conventionally used.
  • Aluminum materials used in the manufacture of hole tubes can be used as they are, for example, JIS-named A1000 series pure aluminum materials, A3000 series aluminum alloy materials, etc. can be used as appropriate.
  • Cu 0.7% by mass or less (not including 0% by mass) and Mn: 1.4% by mass or less (not including 0% by mass) are advantageous.
  • Cr 0.05 to 0.30 mass%
  • Zr 0.05 to 0.30 mass%
  • Ti 0.05 to 0.30 mass%
  • Sr 0.0001 to 0
  • An aluminum alloy containing at least one of 1 mass% and the balance being aluminum and inevitable impurities (for example, Si, Fe, Zn, etc.) will be used.
  • the Cu content exceeds 0.7% by mass, there is a problem that deformation resistance at the time of extrusion rises, making high-speed extrusion difficult, and pickup phenomenon occurs at high-speed extrusion.
  • the total content of these inevitable impurities is regulated within a generally recognized range, and is usually 0.5% by mass or less, preferably 0.3% by mass.
  • the flat multi-hole tube 10 according to the present invention as described above is manufactured by using the above-described aluminum tube main body material and aluminum brazing material as an aluminum material to be extruded, and simultaneously extruding these materials.
  • the pipe body material and the brazing material are generally used in combination of a composite billet having a core-sheath structure or a plurality of billets.
  • aluminum having a cross-sectional shape such as a circle, an oval, an ellipse, a rectangle, a half moon, a crescent, a polygon, etc. on the inner surface (center) of the aluminum brazing material, and an optimized cross-sectional dimension.
  • a sheath billet is formed by providing a through-hole of a predetermined size at the center of a billet made of an aluminum brazing material.
  • the core billet made of an aluminum tube main body material is inserted into the through-hole, and the sheath billet is produced in the form of being divided into two parts.
  • the target composite billet can be formed by a method of fixing the whole by welding or the like and integrating them.
  • FIGS. 2A and 2B show an example of such a composite billet, in which the composite billet 20 is outside the cylindrical tube body material billet (core billet) 22.
  • a cylindrical brazing material billet (sheath billet) 14 is integrally disposed.
  • the composite billet 20 is applied with a technique of hot extrusion using a die having a plurality of extrusion ports, a so-called porthole die, similar to the case of manufacturing a conventional extruded flat multi-hole tube, As a result, the target extruded flat multi-hole tube 10 can be obtained.
  • the longitudinal pusher disposed so as to correspond to the plurality of flow paths 12 of the flat multi-hole tube 10 is obtained.
  • the composite body With respect to the die having an outlet, the composite body so that the longitudinal direction of the predetermined cross-sectional shape of the pipe body material (22) disposed inside the composite billet 20 coincides with the longitudinal direction of the extrusion port of the die.
  • the billet 20 is arranged and hot extrusion is performed.
  • the brazing material (24) in the composite billet 20 can be effectively distributed to the flat outer peripheral portion of the obtained flat multi-hole tube 10.
  • the brazing material portion can be advantageously exposed to the outer peripheral surface of the pipe.
  • the billet 24 for the brazing material outside the composite billet 20 is provided.
  • the brazing material portion 18 in the flat multi-hole tube 10 formed by being wound around the inner tube body material billet 22 easily enters the aluminum tube body material constituting the tube outer peripheral wall portion 14.
  • a predetermined disk-shaped front plate 26 is integrally disposed on the front end side (front side) of the composite billet 20 in the extrusion direction.
  • a method of extruding from a port hole die is advantageously employed, and thereby, the entrainment of the brazing filler metal portion 18 at both end edges of the extruded flat multi-hole tube 10 to be formed can be effectively suppressed or prevented. It became.
  • a circular or annular front plate 26 made of the same material as the aluminum tube main body material is fixed to the tip of the composite billet 20 by welding or the like.
  • the diameter of the front plate 26 is in the range of 90% or more and 100% or less with respect to the diameter of the composite billet 20. If the diameter of the front plate 26 is larger than 100% of the diameter of the composite billet 20, problems such as being caught when the composite billet 20 is inserted into the container and being unable to be extruded are caused.
  • the diameter of the front plate 26 is smaller than 90% of the diameter of the composite billet 20, it exists in the metal of the billet 22 for aluminum tube body material located on the rear surface and the outer surface of the billet from the gap during the extrusion process. There is a risk that the oxide film, foreign matter, or the brazing material metal of the billet 24 for brazing material is pushed out preferentially, and the entanglement of both ends of the extruded flat multi-hole tube 10 may be defective. Furthermore, it is desirable that the thickness of the front plate 26 be 5% or more and 30% or less with respect to the diameter of the composite billet 20. Among these, a ratio of 10% or more and 25% or less is optimal.
  • the thickness of the front plate 26 is less than 5%, the range of dead metal remaining in the container cannot be sufficiently filled with the front plate material, and the brazing to both end edges of the extruded flat multi-hole tube 10 is not possible. If the thickness of the front plate 26 exceeds 30%, the material ratio of the front plate 26 becomes too high and the outer surface of the extruded flat multi-hole tube 10 may be damaged. There are problems such as an increase in the amount of product cut until the brazing material is stably clad.
  • tube according to this invention as mentioned above can be used suitably as a refrigerant
  • a refrigerant passage pipe for example, a pair of aluminum header tanks arranged at a distance from each other, and a width direction ventilation direction between both header tanks Facing each other, a plurality of extruded aluminum flat multi-hole pipes arranged in parallel with each other at intervals in the longitudinal direction of the header tank and having both ends connected to both header tanks, and adjacent flat multi-hole pipes Between and between the flat multi-hole pipes at both ends and brazed to these flat multi-hole pipes, and aluminum corrugated fins as outer fins, and arranged outside the corrugated fins at both ends, In a structure comprising an aluminum side plate brazed to such fins, a heat exchanger will be configured.
  • a heat exchanger of such structures as the
  • a pair of header tanks in a heat exchanger distributes and flows refrigerant or coolant from one header tank to a flat multi-hole tube, while the other header tank is flat flat.
  • the header plate and the header plate are brazed facing each other, or the plate is bent into a tubular shape and stacked.
  • an extruded tube or the like extruded into a tubular shape will be used.
  • various billets A to R for aluminum brazing material having the component composition shown in Table 1 below and various aluminum pipes having the component composition shown in Table 3 below are cast.
  • the various billets B1 to B32 shown in Table 5 below are manufactured by combining the billets in various combinations, and then the composite billets are respectively hot extruded.
  • various flat multi-hole tubes T1 to T32 corresponding to the composite billets shown in Table 5 below were obtained.
  • the aluminum brazing material billets A to R shown in Table 1 and the aluminum brazing material billets S to AA shown in Table 2 are provided.
  • Each of the alloy components was adjusted, and various DC cast billets of 90 mm ⁇ were prepared according to a conventional method.
  • the alloy components were adjusted to give the aluminum tube body material billets a to o shown in Table 3 and the aluminum tube body material billets p to u shown in Table 4 to form the tube body part.
  • a DC cast billet was produced in the same manner as described above, and the obtained billet was molded into a cylindrical body having a predetermined dimension within a circular dimension of 5 mm to 85 mm.
  • a through-hole into which the processed pipe body material billet can be inserted is formed in the central portion of the cross-section of the brazing material billet, and the pipe body material billet is inserted into the through-hole.
  • the billet for the brazing material and the billet for the pipe body material are fixed and joined to each other in the longitudinal direction by MIG welding, and the composite billets B1 to B32 and B33 to B52 shown in Tables 5 and 6, respectively.
  • the extrusion billet B53 shown in Table 6 is a single billet shown as 30 in FIG.
  • 22 and 32 are pipe body material billets
  • 24 is a brazing material billet.
  • various dimensions (diameter and thickness) shown in Tables 5 and 6 are formed on the front end surface in the extrusion direction of the obtained composite billet 20 or single billet 30.
  • the disk-shaped front plate 26 is fixed by welding, and the billet-front plate assembly is heated to 500 ° C. with a billet heater.
  • Tables 7 and 8 below show the results of evaluation of the problem of entrainment of the brazing material portion (18) in the flat multi-hole tubes T1 to T32 and the flat multi-hole tubes T33 to T53, respectively.
  • the flat multi-hole tube T48 was not evaluated because the hot extrusion process was stopped in the middle.
  • flat multi-hole tubes T33, T34, and T53 obtained by carrying out hot extrusion using a port hole die using the composite billets B33, B34 and the single billet B53 do not contain any brazing filler metal component. Since the billet of the conventional alloy or pure Al alloy is used, there is no brazing material portion (18), and the trouble of the brazing material portion (18) being caught at both pipe end edges is not present. It was not confirmed. Similarly, in the flat multi-hole tubes T35 to T47, T50, and T52, the entrainment of the brazing filler metal portion (18) was not recognized.
  • the flat multi-hole tubes T33, T34, and T53 do not use a billet containing a brazing filler metal component and are made of a conventional alloy or a pure Al alloy, so that the brazing filler metal portion (18) is formed.
  • the flat multi-hole tube T48 was not evaluated because it could not be manufactured due to the suspension of hot extrusion.
  • flat multi-hole tubes T1 to T32 and T33 to T53 are subjected to cross-sectional observation over the entire length at a pitch of 1.0 m in the extrusion direction after each hot extrusion process, and defective cladding
  • the length of the part (only the front plate material, the one where the cladding rate is too large due to the influence of the front plate material) was measured.
  • the length of the defective clad part when the length of the defective clad part is 15 m or less, it is evaluated as ( ⁇ ), and when the length is more than 15 m, it is evaluated as (x). 7 and Table 8.
  • the flat multi-hole tubes T33, T34, and T53 all are obtained using a billet that does not contain a brazing filler metal component. Even in the flat multi-hole tubes T35 to T47 and T52, although the defective cladding portion was confirmed, the length of the defective cladding portion was 15 m or less. However, in the flat multi-hole tubes T49 to T51, it has been confirmed that the length of the defective clad portion exceeds 15 m. In particular, the flat multi-hole tube T51 has a total length (about 60 m) to the extrusion tail portion where the extrusion is completed. A defective clad portion was confirmed.
  • Tables 9 and 10 below show the results of measuring the formation range of the brazing filler metal part (18) for the flat multi-hole tubes T1 to T32 and T33 to T53, and the brazing filler metal part exposed to the outer peripheral part of the pipe It is shown as the value at which the circumference of (18) is the minimum and the maximum thickness of the brazing filler metal part (18) in the pipe outer peripheral wall part (14).
  • the brazing material portion (18) made of the billet for the brazing material is included in the circumferential length L of the outer circumference of the tube in all of the circumferential length of the outer circumference of the flat multi-hole tubes T1 to T32 obtained by the extrusion process. It was confirmed that it was exposed at a ratio of 50% to 100%. Further, the thickness of the brazing filler metal part (18) formed on the pipe outer peripheral wall part (14) is present in a range of 90% or less of the thickness of the pipe outer peripheral wall part (14), It was observed that it was exposed on the outer surface of the tube.
  • the brazing material portion (18) formed by the billet for brazing material is the outer peripheral portion of the tube. It was also confirmed that it was stably exposed on the outer surface.
  • flat multi-hole tubes T33, T34, and T53 obtained by carrying out hot extrusion with a port hole die using the composite billets B33, B34 and the single billet B53 do not contain a brazing filler metal component. Since a billet made of a conventional alloy or a pure Al-based alloy is used, there is no brazing filler metal part (18), and therefore no exposure on the outer surface of the pipe was observed. Further, in the flat multi-hole tube T51 obtained using the composite billet B51 shown in Table 6, the exposed portion of the brazing filler metal portion (18) is 100% of the tube outer peripheral portion circumferential length L, and the tube The thickness of the outer peripheral wall (14) was 93% at the thickest part.
  • the flat multi-hole tubes T35 to T47, T49, T50, and T52 obtained by the above method using the composite billets B35 to B47, B49, B50, and B52 shown in Table 6 are used for the brazing filler metal portion (18).
  • the exposed portions were all 50% or less of the tube outer peripheral portion circumferential length L, and the thickness of the tube outer peripheral wall portion (14) was 10 to 20% at the thickest portion.
  • the flat multi-hole tube T48 was not evaluated because the billet was clogged during the hot extrusion of the composite billet B48 shown in Table 6 and the intended flat multi-hole tube was not obtained.
  • bare fins with a thickness of 80 ⁇ m corrugated into a fin pitch of 3 mm and a fin height of 7 mm are assembled to the flat multi-hole tubes T1 to T32 and T33 to T53, respectively.
  • brazing heating for fin bonding when used as a heat transfer tube in a heat exchanger after heat treatment at 600 ° C. for 3 minutes and brazing to form a heat exchanger core
  • the fins joined to the flat multi-hole pipes of the respective heat exchanger cores were cut and removed with a cutter, and the joining state of the fins and the fault occurrence state of the flat multi-hole pipes were visually confirmed.
  • heat exchanger cores are manufactured using flat multi-hole tubes T1 to T32 and T33 to T53 as test materials, and the state of fin bonding of the heat exchanger core after brazing and the flat The results of verifying the status of occurrence of defects in the hole tube are shown respectively.
  • the flat multi-hole tubes T1 to T32 showed no defective fin bonding in the heat exchanger core after brazing heating and no defects in the flat multi-hole tube. Accordingly, it is recognized that the flat multi-hole tubes T1 to T32 all exhibit a good fin joint form due to the presence of the brazing material portion (18) and are good as a flat multi-hole tube for brazing. It was.
  • the flat multi-hole tubes T33, T34, and T53 shown in Table 12 are all flat multi-hole tubes using only a conventional material that does not contain a brazing filler metal component and a material made of a pure Al-based alloy. Therefore, the fins were not joined in the heat exchanger core after brazing heating. Further, even in the flat multi-hole tube T36, since the content of Si as the brazing material component was 0% by mass, the fins were not joined. Furthermore, since the flat multi-hole tube T35 shown in Table 12 has a Si content of 14.0% by mass and a large content, the brazing filler metal part (18) is not heated during brazing heating. It melted, and through holes due to melting were observed in the base material.
  • the flat multi-hole tubes T37 to T47, T50, and T52 had a wide unjoined portion although some fins were joined. Furthermore, in the flat multi-hole tubes T49 and T51, the brazing filler metal layer (18) melts at the time of brazing heating in the poorly entrained portion of the brazing filler metal layer recognized at both end corners, and a through hole is formed. Admitted. In particular, in the flat multi-hole tube T51, the pipe outer peripheral wall portion (14) was melted in addition to the poorly wound portion of the brazing material layer at both ends of the flat multi-hole tube, and through holes due to melting were observed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
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  • General Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
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  • Crystallography & Structural Chemistry (AREA)
  • Extrusion Of Metal (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

La présente invention augmente efficacement les excellentes propriétés de brasage de surface externe d'un tuyau perforé plat extrudé en aluminium, et fournit un procédé de production de manière peu coûteuse, simple et avantageuse de celui-ci. Un tuyau perforé plat extrudé en aluminium 10 est formé en extrudant simultanément un matériau de corps principal de tuyau en aluminium et un matériau de brasage comprenant un alliage d'aluminium à base d'Al-Si, une section de matériau de brasage 18 étant formée par exposition du matériau de brasage autour de la totalité de la section de paroi circonférentielle externe de tuyau ou d'au moins une partie de la section plate de la section de paroi circonférentielle externe de tuyau.
PCT/JP2018/004424 2017-02-13 2018-02-08 Tuyau perforé plat extrudé en aluminium présentant d'excellentes propriétés de brasage, et son procédé de production Ceased WO2018147376A1 (fr)

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JP2018567494A JPWO2018147376A1 (ja) 2017-02-13 2018-02-08 優れたろう付け性を有するアルミニウム押出扁平多穴管及びその製造方法
DE112018000796.0T DE112018000796T5 (de) 2017-02-13 2018-02-08 Stranggepresste flache perforierte Aluminiumröhre, die hervorragende Hartlöteigenschaften ausstellt, und Verfahren dieser herzustellen
CN201880011508.8A CN110290882B (zh) 2017-02-13 2018-02-08 具有优异的钎焊性的铝挤出扁平多孔管及其制造方法

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JP2023044366A (ja) * 2021-09-17 2023-03-30 株式会社レゾナック 熱交換器、熱交換器の製造方法
CN116922106A (zh) * 2023-09-13 2023-10-24 江苏瑞邦复合材料科技有限公司 一种风力发电机组复合扁线成型方法及成型设备

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JP7519626B2 (ja) * 2020-09-09 2024-07-22 パナソニックＩｐマネジメント株式会社 熱交換器およびその製造方法
CN118080852B (zh) * 2024-04-19 2024-08-13 上海华峰铝业股份有限公司 一种铝合金自钎焊钎料板的挤压装置及制备方法

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JP7690830B2 (ja) 2021-09-17 2025-06-11 株式会社レゾナック 熱交換器、熱交換器の製造方法
CN116922106A (zh) * 2023-09-13 2023-10-24 江苏瑞邦复合材料科技有限公司 一种风力发电机组复合扁线成型方法及成型设备
CN116922106B (zh) * 2023-09-13 2024-01-05 江苏瑞邦复合材料科技有限公司 一种风力发电机组复合扁线成型方法及成型设备

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CN110290882B (zh) 2021-07-13

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