WO2012128240A1 - Tube sans soudure, bobine, bobine enroulée en spires jointives, procédé de fabrication d'une bobine enroulée en spires jointives, échangeur de chaleur du type à tubes et ailettes transversales et procédé de fabrication d'un échangeur de chaleur du type à tubes et ailettes transversales - Google Patents

Tube sans soudure, bobine, bobine enroulée en spires jointives, procédé de fabrication d'une bobine enroulée en spires jointives, échangeur de chaleur du type à tubes et ailettes transversales et procédé de fabrication d'un échangeur de chaleur du type à tubes et ailettes transversales Download PDF

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Publication number
WO2012128240A1
WO2012128240A1 PCT/JP2012/056966 JP2012056966W WO2012128240A1 WO 2012128240 A1 WO2012128240 A1 WO 2012128240A1 JP 2012056966 W JP2012056966 W JP 2012056966W WO 2012128240 A1 WO2012128240 A1 WO 2012128240A1
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Prior art keywords
seamless
tube
coil
seamless pipe
level
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PCT/JP2012/056966
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English (en)
Japanese (ja)
Inventor
勝政 平工
正明 小平
聖健 澤
Original Assignee
株式会社住軽伸銅
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Application filed by 株式会社住軽伸銅 filed Critical 株式会社住軽伸銅
Priority to CN201280011837.5A priority Critical patent/CN103415643B/zh
Priority to JP2012533811A priority patent/JP5132845B2/ja
Priority to KR1020137023313A priority patent/KR101385801B1/ko
Publication of WO2012128240A1 publication Critical patent/WO2012128240A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • 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
    • C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
    • 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
    • F28D1/047—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 bent, e.g. in a serpentine or zig-zag
    • 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
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
    • 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
    • F28F21/085—Heat exchange elements made from metals or metal alloys from copper or copper alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes

Definitions

  • the present invention relates to a seamless pipe made of phosphorous-deoxidized copper used for heat transfer pipes or refrigerant pipes for air conditioner heat exchangers, refrigerators and the like.
  • heat pipes for air conditioners such as room air conditioners and packaged air conditioners, and heat transfer pipes or refrigerant pipes for refrigerators, etc.
  • heat pipes for air conditioners such as room air conditioners and packaged air conditioners
  • heat transfer pipes or refrigerant pipes for refrigerators etc.
  • various physical properties such as strength, workability, and heat transfer properties.
  • JIS C1220T phosphorus-deoxidized copper pipe
  • Patent Document 1 Japanese Unexamined Patent Publication No. 2003-268467 discloses a seamless pipe made of a copper alloy having high strength.
  • the strength is improved by work hardening when performing strong processing called hairpin bending (U bending) in the process of assembling to the heat exchanger.
  • hairpin bending U bending
  • the yield strength is about 200 MPa and the elongation is less than 30%, which causes a problem that normal bending cannot be performed.
  • wrinkles are generated in the inner part of the bend, the bend is flattened, and the value in appearance quality is significantly impaired. In extreme cases, breakage occurs.
  • the diameter and thickness of the heat transfer tube are reduced and the hairpin bending pitch is small and the hairpin bending conditions are severe, it is increasingly difficult to perform normal hairpin bending.
  • the present invention is to provide a seamless tube made of phosphorus-deoxidized copper that has high strength and can perform hairpin bending normally.
  • the present inventors have specified the total degree of work in cold working in the process of manufacturing seamless pipes by processing phosphorous deoxidized copper.
  • the range, the holding temperature of the final annealing by a specific range the tensile strength (sigma B) despite the high 0.2% proof stress (sigma 0.2) is low, elongation ( A seamless pipe having a high ⁇ ) is obtained, and the tensile strength ( ⁇ B ) is set to a specific range, and the 0.2% proof stress ( ⁇ 0.2 ) and the elongation ( ⁇ ) are set to a specific range.
  • the present seamless pipe has been found to be able to bend hairpin normally despite its high strength, and has completed the present invention.
  • the present invention (1) is a seamless tube for a heat transfer tube of a cross fin tube type heat exchanger,
  • the material of the seamless pipe is phosphorus deoxidized copper
  • the ratio (t / D) of the wall thickness (mm) to the outer diameter (mm) of the seamless pipe is 0.040 or less
  • the seamless pipe has a tensile strength ( ⁇ B ) of 245 MPa or more, 0.2% proof stress ( ⁇ 0.2 ) is 140 MPa or less, Elongation ( ⁇ ) is 40% or more
  • a seamless tube characterized by the above is provided.
  • this invention (2) is a coil produced by winding a seamless pipe,
  • the material of the seamless pipe wound around the coil is phosphorus deoxidized copper,
  • the ratio (t / D) of the wall thickness (mm) to the outer diameter (mm) of the seamless pipe wound around the coil is 0.040 or less,
  • the tensile strength ( ⁇ B ) of the seamless pipe wound around the coil is 245 MPa or more, 0.2% proof stress ( ⁇ 0.2 ) is 130 MPa or less, Elongation ( ⁇ ) is 40% or more,
  • the coil characterized by this is provided.
  • the present invention (3) is a level-wound coil in which the coil is produced by arranging multiple layers in a cylindrical shape.
  • the material of the seamless pipe wound around the level wound coil is phosphorous deoxidized copper,
  • the ratio (t / D) of the wall thickness (mm) to the outer diameter (mm) of the seamless pipe wound around the level wound coil is 0.040 or less,
  • the tensile strength ( ⁇ B ) of the seamless pipe wound around the level wound coil is 245 MPa or more, 0.2% proof stress ( ⁇ 0.2 ) is 130 MPa or less, Elongation ( ⁇ ) is 40% or more,
  • a level-wound coil characterized by the above is provided.
  • the material is phosphorous deoxidized copper
  • the ratio (t / D) of the thickness (mm) to the outer diameter (mm) is 0.040 or less
  • the tensile strength ( ⁇ B ) is 245 MPa or more
  • 0.2% proof stress ( ⁇ 0.2 ) is 120 MPa or less
  • a level-wound coil-producing seamless pipe having an elongation ( ⁇ ) of 40% or more is aligned in a cylindrical shape.
  • the present invention provides a method for producing a level-wound coil that is wound to produce a level-wound coil.
  • the present invention (5) comprises hairpin bending the seamless pipe of the present invention (1), the coil of the present invention (2), or the seamless pipe unwound from the level wound coil of the present invention (3), and aluminum fins.
  • the cross fin tube heat exchanger obtained by assembling to is provided.
  • the present invention (6) is a method of bending the seamless tube unrolled from the seamless tube of the present invention (1), the coil of the present invention (2) or the level wound coil of the present invention (3) by hairpin bending,
  • a cross fin tube type heat exchanger is obtained by assembling to a cross fin tube type heat exchanger.
  • the seamless tube of the present invention is a seamless tube for a heat transfer tube of a cross fin tube type heat exchanger
  • the material of the seamless pipe is phosphorus deoxidized copper
  • the ratio (t / D) of the wall thickness (mm) to the outer diameter (mm) of the seamless pipe is 0.040 or less
  • the seamless pipe has a tensile strength ( ⁇ B ) of 245 MPa or more, 0.2% proof stress ( ⁇ 0.2 ) is 140 MPa or less, Elongation ( ⁇ ) is 40% or more, It is a seamless tube characterized by.
  • the seamless tube of the present invention is a seamless tube for a heat transfer tube of a cross fin tube type heat exchanger. That is, the seamless pipe of the present invention is a seam used for manufacturing a cross fin tube type heat exchanger by being hairpin bent and assembled to a fin material when the cross fin tube type heat exchanger is manufactured. There is no pipe.
  • the seamless pipe of the present invention is made of phosphorous deoxidized copper.
  • the phosphorus-deoxidized copper according to the seamless pipe of the present invention does not contain various alloy components, and the chemical composition is defined in JIS H3300 C1220 or C1201, so that the phosphorus-deoxidized copper according to the seamless pipe of the present invention.
  • the P content of the acid copper is 0.004 to 0.040 mass%, preferably 0.015 to 0.030 mass%, and the Cu content is 99.90 mass% or more.
  • the seamless pipe of this invention is a product made from phosphorus deoxidation copper, it is excellent in recyclability.
  • the ratio (t / D) of the wall thickness (mm) to the outer diameter (mm) of the seamless pipe of the present invention is 0.040 or less, preferably 0.020 to 0.040, particularly preferably 0.030 to 0. .038.
  • t / D is in the above range, the seamless pipe can sufficiently cope with the reduction in diameter and thickness.
  • the outer diameter D (mm) of the seamless pipe of the present invention is 3 to 8 mm, particularly preferably 4 to 7 mm.
  • the wall thickness t (mm) of the seamless pipe of the present invention is determined by the outer diameter (D) of the seamless pipe and the ratio of the wall thickness to the outer diameter (t / D). 0.15 to 0.30 mm is preferable.
  • the tensile strength ( ⁇ B ) of the seamless pipe of the present invention is 245 MPa or more, preferably 245 to 265 MPa.
  • ⁇ B The tensile strength of the seamless pipe of the present invention.
  • the 0.2% proof stress ( ⁇ 0.2 ) of the seamless pipe of the present invention is 140 MPa or less, preferably 80 to 120 MPa.
  • the elongation ( ⁇ ) of the seamless pipe of the present invention is 40% or more, preferably 40 to 55%.
  • the hairpin bending workability is improved.
  • strong processing with a small bending pitch P for example, hairpin processing with a bending pitch P of 22 mm or less shown in FIG. 1
  • the tube is flattened, or is damaged in an extreme case.
  • the 0.2% proof stress of the seamless pipe is less than 80 MPa, problems such as buckling and clogging are likely to occur in the bending process because the degree of bending and bending of the material increases before being subjected to bending.
  • the bending pitch P is a distance between the tube axes (code
  • Examples of the seamless pipe according to the present invention include an inner surface smooth tube (bearing tube) in which no inner surface groove is formed and an inner surface grooved tube in which an inner surface groove is formed.
  • the outer diameter D of the seamless tube is the outer diameter of the tube in a cross section when the seamless tube is cut by a plane perpendicular to the tube axis direction, and the wall thickness t of the seamless tube. Is the thickness of the pipe in a cross section when the seamless pipe is cut along a plane perpendicular to the pipe axis direction.
  • the outer diameter D of the seamless pipe is the outer diameter of the pipe in a cross section when the seamless pipe is cut by a plane perpendicular to the pipe axis direction.
  • the wall thickness t is the thickness of the pipe (bottom wall thickness) at the deepest position s of the inner groove in the cross section when the seamless pipe is cut along a plane perpendicular to the pipe axis direction. It is.
  • the manufacturing method of the seamless pipe of the first aspect of the present invention is a manufacturing method in the case where the seamless pipe is an inner surface smooth pipe.
  • the manufacturing method of the seamless pipe of the 2nd form of this invention is a manufacturing method in case a seamless pipe is an internal grooved pipe.
  • the method for producing a seamless pipe according to the first aspect of the present invention includes a casting process for casting phosphorous deoxidized copper, a hot extrusion process, and a cold working with a total working degree of 99.5% or more in terms of a cross-section reduction rate.
  • a cold working process for performing a final annealing process in which annealing is performed at a holding temperature of 360 to 600 ° C. is performed in this order, and an intermediate annealing process is not performed between the hot extrusion process and the final annealing process. It is a manufacturing method.
  • a casting process, a hot extrusion process, a cold working process, and a final annealing process are performed in this order.
  • performing these in order does not mean that a hot extrusion process is performed immediately after the casting process, a cold working process is performed immediately after the hot extrusion process, and a final annealing process is performed immediately after the cold working process. It means that a hot extrusion process is performed after the casting process, a cold working process is performed after the hot extrusion process, and a final annealing process is performed after the cold working process.
  • the seamless pipe manufacturing method includes a casting process for casting phosphorous deoxidized copper, a hot extrusion process, and a cold working with a total workability of 99.8% or more in terms of the cross-section reduction rate.
  • a cold working process in which hot working is performed, an intermediate annealing process (A), a rolling process process, and a final annealing process in which annealing is performed at a holding temperature of 360 to 600 ° C. are sequentially performed, and a hot extrusion process and an intermediate annealing process are performed.
  • This is a seamless pipe manufacturing method in which no other intermediate annealing treatment is performed between the treatment (A).
  • a casting process, a hot extrusion process, a cold working process, an intermediate annealing process (A), a rolling process process, and a final annealing process In order.
  • performing these in order means that a hot extrusion process is performed immediately after the casting process, a cold processing process is performed immediately after the hot extrusion process, an intermediate annealing process (A) is performed immediately after the cold processing process, and an intermediate annealing process.
  • the rolling process is performed immediately after the process (A), and the final annealing process is not performed immediately after the rolling process, but the hot extrusion process is performed after the casting process, and the cold processing process is performed after the hot extrusion process.
  • the intermediate annealing process (A) is performed after the cold working process
  • the rolling process process is performed after the intermediate annealing process (A)
  • the final annealing process is performed after the rolling process process.
  • the casting process according to the method for manufacturing a seamless pipe according to the first aspect of the present invention and the method for manufacturing the seamless pipe according to the second aspect of the present invention involves melting and casting in accordance with a conventional method, and a predetermined element is a predetermined element. It is a step of obtaining a billet that is blended by content.
  • a predetermined element is a predetermined element.
  • the casting process for example, copper ingot, copper scrap, Cu-P master alloy, etc. are blended and the components are adjusted so that the P content becomes a predetermined content, and then a high frequency melting furnace or the like is used. And billet is cast.
  • heat for extruding a billet obtained by performing a casting process is then performed.
  • Inter-extrusion process is performed.
  • the billet is heated at a predetermined temperature before hot extrusion, and then hot extrusion is performed.
  • Hot extrusion is performed by mandrel extrusion. That is, hot extruding is performed with a mandrel inserted into a billet that has been previously perforated cold before heating, or a billet that has been perforated hot before extrusion to obtain a seamless hot extruded element tube. .
  • the seamless hot-extrusion element tube obtained by performing the hot extrusion process is quickly cooled after the hot extrusion process.
  • the cooling is performed by extruding the seamless hot-extrusion element tube into water or by introducing the seamless hot-extrusion element tube after hot extrusion into water.
  • the seamless extruded element pipe after cooling is then cold-worked.
  • a cold working process is performed to reduce the outer diameter and thickness.
  • Cold working is cold drawing (drawing) or a combination of cold rolling with a tube laser and cold drawing (drawing).
  • cold working such as rolling and drawing can be performed a plurality of times.
  • the cold working step refers to all of the cold working.
  • the method for manufacturing the seamless pipe according to the first aspect of the present invention and the method for manufacturing the seamless pipe according to the second aspect of the present invention are different from each other.
  • the final annealing treatment of the seamless bare tube after the cold working obtained by performing the cold working step is performed.
  • the holding temperature and holding time of the final annealing treatment are appropriately selected so that the tensile strength ( ⁇ B ), 0.2% proof stress ( ⁇ 0.2 ) and elongation ( ⁇ ) of the seamless pipe are within the predetermined ranges. Is done.
  • a temperature of “recrystallization temperature (° C.) ⁇ 0.7” to “recrystallization temperature (° C.) ⁇ 0.8” is selected in the range of 360 to 600 ° C.
  • a temperature of 420 to 480 ° C. is selected.
  • an intermediate annealing process is not performed between a hot extrusion process and a final annealing process, but the total workability ( (Section reduction rate) is 99.5% or more.
  • the total degree of cold working process is the machining of the seamless tube after the last cold working performed in the cold working process for the first seamless steel pipe before the cold working performed in the cold working process. It indicates the degree and is represented by the cross-sectional reduction rate shown in the following formula (1).
  • Cross-sectional reduction rate (%) ((cross-sectional area before processing of pipe ⁇ cross-sectional area after processing of pipe) / (cross-sectional area before processing of pipe)) ⁇ 100 (1)
  • cross-sectional reduction rate (%) ((cross-sectional area before the first cold rolling of the tube ⁇ Cross sectional area after the last cold drawing of the tube) / (Cross sectional area before the first cold rolling of the tube)) ⁇ 100 ”.
  • the intermediate annealing process is not performed, and the total processing degree of the cold working process is not performed.
  • the tensile strength ( ⁇ B ) of the seamless pipe obtained by final annealing is 245 MPa or more, preferably 245 to 265 MPa.
  • the 2% proof stress ( ⁇ 0.2 ) can be 140 MPa or less, preferably 80 to 120 MPa, and the elongation ( ⁇ ) can be 40% or more, preferably 40 to 55%.
  • the seamless pipe of the present invention can be obtained by performing the seamless pipe manufacturing method of the first aspect of the present invention.
  • the cold-worked seamless pipe obtained by performing the cold-working process subsequent to the cold-working process is subjected to 450 to 600 ° C.
  • An intermediate annealing process (A) is performed by heating at the holding temperature. By performing the intermediate annealing process (A), the rolling process in the rolling process is facilitated.
  • the seamless pipe manufacturing method of the second aspect of the present invention after the intermediate annealing process (A) is performed, no other heat treatment is performed until the rolling process step is performed. That is, the intermediate annealing process (A) is a heat treatment before the rolling process.
  • a rolling process step of rolling the seamless pipe after the intermediate annealing treatment (A) is then performed.
  • the rolling process is a process of forming a groove on the inner surface of the pipe material.
  • the rolling process is performed by forming a spiral groove on the outer surface of the seamless pipe after the intermediate annealing (A). This is done by placing the formed plug and pressing it from the outside of the tube with a plurality of rolling balls rotating at high speed to transfer the groove of the formed plug to the inner surface of the tube.
  • a rolling process process is performed after performing an intermediate annealing process (A), after performing a diameter reduction process.
  • a final annealing process is then performed on the internally grooved pipe after the rolling process obtained by performing the rolling process.
  • the holding temperature of the final annealing treatment is a temperature of 360 to 600 ° C.
  • the processing time for the final annealing treatment is appropriately selected so that the tensile strength ( ⁇ B ), 0.2% proof stress ( ⁇ 0.2 ), and elongation ( ⁇ ) of the seamless pipe are within a predetermined range.
  • the manufacturing method of the seamless pipe of the 2nd form of this invention does not perform heat processing, such as another intermediate annealing process, between a hot extrusion process and an intermediate annealing process (A).
  • the total processing degree (cross-sectional reduction rate) of the processing steps is 99.8% or more and keeping the holding temperature of the final annealing treatment within the above range
  • the tensile strength of the seamless pipe obtained by performing the final annealing treatment ( ⁇ B ) is 245 MPa or more, preferably 245 to 265 MPa
  • 0.2% proof stress ( ⁇ 0.2 ) is 140 MPa or less, preferably 80 to 120 MPa
  • elongation ( ⁇ ) is 40% or more, preferably 40 to 55. %.
  • the total degree of cold working process is the processing of the seamless element tube after the cold working performed last in the cold working process for the first seamless element tube performed before the cold working process.
  • Degree (degree (1)) is the total degree of cold working process.
  • the seamless pipe of the present invention can be obtained by performing the method for producing the seamless pipe of the second aspect of the present invention.
  • the seamless tube is an internally grooved tube, it is possible to maintain both the heat transfer performance and the bending workability of the tube by setting the dimensional parameters of the internal groove within the following range, preferable.
  • ⁇ When fin height is h (mm) and wall thickness (bottom wall thickness) is t (mm), h / t is 0.50 to 1.2 ⁇
  • lead angle is ⁇ (°) and fin apex angle is ⁇ (°) ⁇ / ⁇ is 0.70 or more
  • the fin height h, the wall thickness (bottom wall thickness) t, and the fin apex angle ⁇ are denoted by symbols h, t, and ⁇ in FIG.
  • the lead angle ⁇ is an inclination angle of the inner surface groove with respect to the tube axis direction of the seamless pipe.
  • the seamless pipe is usually wound in a coil shape to form a coil.
  • a coil that is, the coil of the present invention is a coil produced by winding a seamless tube,
  • the material of the seamless pipe wound around the coil is phosphorus deoxidized copper,
  • the ratio (t / D) of the wall thickness (mm) to the outer diameter (mm) of the seamless pipe wound around the coil is 0.040 or less, preferably 0.020 to 0.040, particularly preferably 0.
  • the tensile strength ( ⁇ B ) of the seamless pipe wound around the coil is 245 MPa or more, preferably 245 to 265 MPa, 0.2% proof stress ( ⁇ 0.2 ) is 130 MPa or less, preferably 80 to 120 MPa, Elongation ( ⁇ ) is 40% or more, preferably 40 to 55%, It is a coil characterized by this.
  • the seamless tube is usually unwound from the coil wound with the seamless tube, and the unwound seamless tube is subjected to hairpin bending, but the coil is cylindrical. It is often a level-wound coil that is wound in multiple layers. That is, the seamless pipe used for the cross fin tube type heat exchanger is often a seamless pipe unwound from the level wound coil.
  • the level wound coil is a bobbin in which seamless pipes are aligned and wound in a cylindrical shape, and the first layer, the second layer, the third layer, etc. wound in a cylindrical shape from the inner surface side of the cylindrical shape. In order from the nth layer, the multilayered layers are wound up to the final nth layer on the outer surface of the cylindrical shape.
  • the level wound coil includes a level wound coil in which the seamless tube is unwound from the inner surface side, and a level wound coil in which the seamless tube is unwound from the outer surface side. Examples of the level wound coil in which the seamless tube is unwound from the outer surface side include a level wound coil disclosed in FIG. 11 of JP-A-2002-370869. Further, examples of the level wound coil in which the seamless pipe is unwound from the inner surface side include a level wound coil disclosed in FIG. 14 of JP-A-2002-370869.
  • the seamless pipe when manufacturing a cross fin tube heat exchanger, the seamless pipe is unwound from the inner or outer surface side of the level-wound coil, but when the seamless pipe is unwound from the level-wound coil. Since seamless hardening is added to the seamless pipe by extending the pipe, the 0.2% proof stress of the seamless pipe after being unwound becomes the 0.2% proof stress of the seamless pipe before being unrolled. Compared to increase. Therefore, the 0.2% proof stress of the seamless pipe wound around the level-wound coil (the seamless pipe before being unwound from the level-wound coil) is a hairpin bending process when manufacturing a cross fin tube type heat exchanger.
  • the level wound coil must be designed so that the 0.2% proof stress ( ⁇ 0.2 ) of the seamless pipe wound is taken into account in the increment when unwinding.
  • Such a level-wound coil i.e., the level-wound coil of the present invention, is a level-wound coil produced by aligning multiple layers of seamless tubes,
  • the material of the seamless pipe wound around the level wound coil is phosphorous deoxidized copper
  • the ratio (t / D) of the wall thickness (mm) to the outer diameter (mm) of the seamless pipe wound around the level wound coil is 0.040 or less
  • the tensile strength ( ⁇ B ) of the seamless pipe wound around the level wound coil is 245 MPa or more
  • 0.2% proof stress ( ⁇ 0.2 ) is 130 MPa or less
  • elongation ( ⁇ ) is 40% or more
  • Is a level-wound coil is a level-wound coil.
  • the material of the seamless tube wound around the level wound coil is phosphorous deoxidized copper.
  • the phosphorous deoxidized copper according to the level wound coil of the present invention is the same as the phosphorous deoxidized copper of the seamless tube of the present invention.
  • the outer diameter D and the wall thickness t of the seamless pipe wound around the level wound coil are the same as the outer diameter D and the wall thickness t of the seamless pipe of the present invention.
  • the ratio (t / D) of the wall thickness (mm) to the outer diameter (mm) of the seamless pipe wound around the level wound coil is 0.040 or less, preferably 0.020. To 0.040, particularly preferably 0.030 to 0.038.
  • the tensile strength ( ⁇ B ) of the seamless pipe wound around the level wound coil is 245 MPa or more, preferably 245 to 265 MPa. Since the tensile strength ( ⁇ B ) of the seamless pipe wound around the level-wound coil is in the above range, the seamless pipe after being unwound from the level-wound coil, that is, a cross-fin tube heat exchanger
  • the tensile strength ( ⁇ B ) of the seamless pipe subjected to the hairpin bending process for the production of 245 MPa can be 245 MPa or more, preferably 245 to 265 MPa.
  • the 0.2% yield strength ( ⁇ 0.2 ) of the seamless pipe wound around the level wound coil is 130 MPa or less, preferably 80 to 110 MPa. Since the 0.2% proof stress ( ⁇ 0.2 ) of the seamless pipe wound around the level-wound coil is in the above range, the seamless pipe after being unwound from the level-wound coil, that is, the cross fin tube.
  • the 0.2% proof stress ( ⁇ 0.2 ) of a seamless pipe subjected to hairpin bending for the production of a mold heat exchanger can be 140 MPa or less, preferably 80 to 120 MPa.
  • the elongation ( ⁇ ) of the seamless pipe wound around the level wound coil is 40% or more, preferably 40 to 55%. Since the elongation ( ⁇ ) of the seamless pipe wound around the level-wound coil is in the above range, the seamless pipe after being unwound from the level-wound coil, that is, the production of the cross fin tube type heat exchanger Therefore, the elongation ( ⁇ ) of the seamless pipe subjected to the hairpin bending process can be 40% or more, preferably 40 to 55%.
  • the tensile strength ( ⁇ B ), 0.2% proof stress ( ⁇ 0.2 ) and elongation ( ⁇ ) of the seamless pipe wound around the level wound coil are within the above ranges.
  • the tensile strength ( ⁇ B ) of the seamless pipe after being unwound from the level wound coil, that is, the seamless pipe subjected to hairpin processing is 245 MPa or more, preferably 245 to 265 MPa.
  • the 0.2% proof stress ( ⁇ 0.2 ) is 140 MPa or less, preferably 80 to 120 MPa
  • the elongation ( ⁇ ) is 40% or more, preferably 40 to 55%.
  • the seamless pipe obtained by performing the final annealing treatment according to the first seamless pipe manufacturing method of the present invention or the second seamless pipe manufacturing method of the present invention has a cylindrical shape. It is wound up into an aligned multilayer winding.
  • the 0.2% proof stress of the seamless pipe wound around the level wound coil is Compared to the 0.2% proof stress of the seamless pipe before being wound around the level wound coil.
  • the 0.2% proof stress of the seamless pipe also increases when it is unwound from the level wound coil.
  • the 0.2% proof stress of the seamless pipe before being wound around the level wound coil for example, the manufacturing method of the seamless pipe according to the first aspect of the present invention or the seamless pipe according to the second aspect of the present invention.
  • the 0.2% proof stress of the seamless pipe obtained by performing the final annealing treatment according to the manufacturing method takes into account the increase when wound around the level wound coil and the increase when unrolled from the level wound coil. Must be designed to the specified range.
  • the seamless pipe used for the production of the level wound coil is made of phosphorous-deoxidized copper, and the ratio of the wall thickness (mm) to the outer diameter (mm) of the seamless pipe.
  • T / D is 0.040 or less, preferably 0.020 to 0.040, particularly preferably 0.030 to 0.038, and the tensile strength ( ⁇ B ) of the seamless pipe is 245 MPa or more, preferably Is 245 to 265 MPa, 0.2% proof stress ( ⁇ 0.2 ) is 120 MPa or less, preferably 80 to 100 MPa, and elongation ( ⁇ ) is 40% or more, preferably 40 to 55%.
  • a seamless tube for producing a wound coil is preferred.
  • such a levelwound coil production seamless tube is wound in a multilayered arrangement in a cylindrical shape to produce a levelwound coil, and then the seamless tube is unwound from the produced levelwound coil to obtain a cross fin.
  • the material is phosphorous deoxidized copper, and the ratio of thickness (mm) to outer diameter (mm) (t / D) Is 0.040 or less, preferably 0.020 to 0.040, particularly preferably 0.030 to 0.038, and the tensile strength ( ⁇ B ) is 245 MPa or more, preferably 245 to 265 MPa.
  • ⁇ B tensile strength
  • the tensile strength ( ⁇ B ), 0.2% proof stress ( ⁇ 0.2 ), and elongation ( ⁇ ) of the seamless pipe for producing the level wound coil are set in the above ranges.
  • the total working degree of the cold working step, the holding temperature or holding of the intermediate annealing process (A) or the final annealing process By appropriately selecting the time, the tensile strength ( ⁇ B ), 0.2% proof stress ( ⁇ 0.2 ), and elongation ( ⁇ ) of the seamless pipe for producing the level wound coil can be within the above ranges.
  • the coil of the present invention is not limited to this.
  • it may be a coil obtained by stacking pancakes in multiple layers by sequentially repeating bunch winding or adjusting the winding diameter directly on the tray without performing aligned winding on bobbins.
  • the cross fin tube type heat exchanger of the present invention is obtained by bending a seamless tube unwound from the seamless tube of the present invention, the coil of the present invention or the level wound coil of the present invention by hairpin bending into an aluminum fin. It is a cross fin tube type heat exchanger obtained by assembling.
  • Example 1 An ingot of phosphorous deoxidized copper (JIS H3300 C1220) having the following chemical components was melted and cast to produce a billet for hot extrusion.
  • -Phosphorus-deoxidized copper had a P content of 0.025% by mass, a Cu content of 99.97% by mass, and the others were inevitable impurities.
  • the billet was heated and subjected to hot extrusion at 850 ° C. to obtain an extruded tube. Next, the extruded extruded tube was extruded into water and quenched. -The inner diameter was about 75 mm perforated before extrusion.
  • the outer diameter of the extruded element tube was 102 mm, and the inner diameter was 75 mm.
  • the extruded blank was cold-rolled with a Birger mill to obtain a rolled blank.
  • the rolling tube had an outer diameter of 46 mm and an inner diameter of 39.8 mm.
  • the degree of work in cold rolling (cross-sectional reduction rate) was 88.9%.
  • Cross-sectional reduction rate (%) ((cross-sectional area before processing ⁇ cross-sectional area after processing) / cross-sectional area before processing) ⁇ 100 (4)
  • the above-mentioned rolled blank was cold drawn a plurality of times to obtain a drawn blank.
  • the outer diameter of the drawing element tube was 38 mm, and the inner diameter was 33 mm.
  • the above-mentioned drawn element pipe was subjected to intermediate annealing to obtain an original pipe for use in the rolling process. ⁇ Intermediate annealing conditions are as shown in Table 1. Table 1 shows the 0.2% proof stress ( ⁇ 0.2 ) and average grain size of the original pipe. (6) The above-mentioned original pipe was processed by ball rolling to obtain an internally grooved pipe A having the following dimensions.
  • -Annealing method performed in a roller hearth continuous annealing furnace.
  • the holding temperature is as shown in Table 1, the rate of temperature increase is 5.0 ° C / min from 25 ° C to the holding temperature, and the cooling rate is 2.2 ° C / min from the holding temperature to 25 ° C. It was.
  • Table 1 shows the tensile strength ( ⁇ B ), 0.2% proof stress ( ⁇ 0.2 ), and elongation ( ⁇ ) of the seamless pipe (for LWC production) after the final annealing treatment.
  • the above seamless pipe (for LWC production) was wound around a cylindrical aligned multilayer winding to produce an LWC of the type that was unwound from the inner surface side.
  • Table 1 shows the tensile strength ( ⁇ B ), 0.2% proof stress ( ⁇ 0.2 ), and elongation ( ⁇ ) of the seamless pipe wound around the LWC.
  • the seamless tube was unwound from the inner surface side of the LWC to obtain a seamless tube (for heat transfer tubes of a cross fin tube type heat exchanger).
  • Table 1 shows the tensile strength ( ⁇ B ), 0.2% proof stress ( ⁇ 0.2 ), and elongation ( ⁇ ) of seamless tubes (for heat transfer tubes of cross fin tube heat exchangers).
  • a hairpin bending test was performed under the following conditions to evaluate workability. The results are shown in Table 1.
  • Wrinkle generation rate (%) (number of tubes with wrinkles / number of tubes tested) ⁇ 100 (II) Flatness
  • Flatness ratio (%) ((maximum outer diameter ⁇ minimum outer diameter) / nominal outer diameter) ⁇ 100
  • a measurement position is a 45 degree, 90 degree, and 135 degree position of a hairpin bending part, and a nominal outer diameter is 7.0 mm in this example.
  • a nominal outer diameter is 7.0 mm in this example.
  • 1, 45 degrees, 90 degrees, and 135 degrees of a hairpin bending part are the position (code
  • the flatness of each seamless pipe tested was determined, and the average value of the flatness was 15% or less.
  • the tensile strength ( ⁇ B ), 0.2% proof stress ( ⁇ 0.2 ), and elongation ( ⁇ ) of the seamless pipe were measured according to JIS Z 2241.
  • the outer diameter of the extruded element tube was 102 mm, and the inner diameter was 75 mm.
  • the extruded blank was cold-rolled with a Birger mill to obtain a rolled blank.
  • the rolling tube had an outer diameter of 46 mm and an inner diameter of 39.8 mm.
  • the degree of work in cold rolling (cross-sectional reduction rate) was 88.9%.
  • Cross-sectional reduction rate (%) ((cross-sectional area before processing ⁇ cross-sectional area after processing) / cross-sectional area before processing) ⁇ 100 (4)
  • the above-mentioned rolled blank was cold drawn a plurality of times to obtain a drawn blank.
  • the outer diameter of the drawing element tube was 38 mm, and the inner diameter was 33 mm.
  • -Annealing method performed in a roller hearth continuous annealing furnace.
  • the holding temperature is as shown in Table 1, the rate of temperature increase is 5.0 ° C / min from 25 ° C to the holding temperature, and the cooling rate is 2.2 ° C / min from the holding temperature to 25 ° C. It was.
  • Table 2 shows the tensile strength ( ⁇ B ), 0.2% proof stress ( ⁇ 0.2 ), and elongation ( ⁇ ) of the seamless pipe (for LWC production) after the final annealing treatment.
  • the above seamless pipe (for LWC production) was wound around a cylindrical aligned multilayer winding to produce an LWC of the type that was unwound from the inner surface side.
  • Table 2 shows the tensile strength ( ⁇ B ), 0.2% proof stress ( ⁇ 0.2 ), and elongation ( ⁇ ) of the seamless pipe wound around the LWC.
  • the seamless tube was unwound from the inner surface side of the LWC to obtain a seamless tube (for heat transfer tubes of a cross fin tube type heat exchanger).
  • Table 2 shows the tensile strength ( ⁇ B ), 0.2% proof stress ( ⁇ 0.2 ), and elongation ( ⁇ ) of seamless tubes (for heat transfer tubes of cross fin tube heat exchangers).
  • ⁇ B tensile strength
  • ⁇ 0.2 0.2% proof stress
  • ⁇ elongation
  • t / D exceeds 0.040 although t / D exceeded 0.040, although the hairpin bending wrinkle and the flatness ratio were passing and it was able to perform normal hairpin bending process, t / D exceeded 0.040. Since the mass per unit length of the seamless tube becomes too high, it cannot be thinned.

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  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

La présente invention se rapporte à un tube sans soudure pour un tube de transfert de chaleur pour un échangeur de chaleur du type à tubes et ailettes transversales. Ledit tube sans soudure est caractérisé en ce que le matériau pour le tube sans soudure est du cuivre désoxydé au phosphore, le rapport de l'épaisseur (mm) du tube sans soudure sur le diamètre externe (mm) du tube sans soudure (à savoir, t/D) est égal ou inférieur à 0,040 et le tube sans soudure présente une résistance à la traction (σB) égale ou supérieure à 245 MPa, une limite d'élasticité avec une déformation permanente de 0,2 % (σ0.2) égale ou inférieure à 140 MPa et un allongement (δ) égal ou supérieur à 40 %. Il devient possible d'obtenir un tube sans soudure composé de cuivre désoxydé au phosphore qui présente une résistance élevée et peut être plié sous la forme d'une épingle à cheveux de manière normale.
PCT/JP2012/056966 2011-03-23 2012-03-19 Tube sans soudure, bobine, bobine enroulée en spires jointives, procédé de fabrication d'une bobine enroulée en spires jointives, échangeur de chaleur du type à tubes et ailettes transversales et procédé de fabrication d'un échangeur de chaleur du type à tubes et ailettes transversales WO2012128240A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201280011837.5A CN103415643B (zh) 2011-03-23 2012-03-19 无缝管、盘管、平绕盘管、平绕盘管的制造方法、交叉翅片管式热交换器和交叉翅片管式热交换器的制造方法
JP2012533811A JP5132845B2 (ja) 2011-03-23 2012-03-19 継目無管、コイル、レベルワウンドコイル、レベルワウンドコイルの製造方法、クロスフィンチューブ型熱交換器及びクロスフィンチューブ型熱交換器の製造方法
KR1020137023313A KR101385801B1 (ko) 2011-03-23 2012-03-19 이음매 없는 관, 코일, 레벨 와운드 코일, 레벨 와운드 코일의 제조 방법, 크로스 핀 튜브형 열교환기 및 크로스 핀 튜브형 열교환기의 제조 방법

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JP2011063777 2011-03-23
JP2011-063777 2011-03-23

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KR20150003679A (ko) 2013-07-01 2015-01-09 가부시키가이샤 코벨코 마테리아루 도칸 열교환기용 인탈산 구리관
JP2017020063A (ja) * 2015-07-08 2017-01-26 株式会社コベルコ マテリアル銅管 フレア加工用銅又は銅合金管

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JP2001096338A (ja) * 1999-09-27 2001-04-10 Mitsui Eng & Shipbuild Co Ltd 冷凍空調用銅管の製造方法
JP2004211115A (ja) * 2002-12-27 2004-07-29 Kobe Steel Ltd 銅管の製造方法
WO2008041777A1 (fr) * 2006-10-04 2008-04-10 Sumitomo Light Metal Industries, Ltd. Alliage de cuivre pour tuyaux sans soudure
JP2010222692A (ja) * 2009-03-25 2010-10-07 Sumitomo Light Metal Ind Ltd 給水給湯用銅合金継目無管
JP2010236063A (ja) * 2009-03-31 2010-10-21 Kobelco & Materials Copper Tube Inc 熱交換器用銅合金管

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JP3303778B2 (ja) * 1998-06-16 2002-07-22 三菱マテリアル株式会社 ０．２％耐力および疲労強度の優れた熱交換器用継目無銅合金管

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Publication number Priority date Publication date Assignee Title
JP2001096338A (ja) * 1999-09-27 2001-04-10 Mitsui Eng & Shipbuild Co Ltd 冷凍空調用銅管の製造方法
JP2004211115A (ja) * 2002-12-27 2004-07-29 Kobe Steel Ltd 銅管の製造方法
WO2008041777A1 (fr) * 2006-10-04 2008-04-10 Sumitomo Light Metal Industries, Ltd. Alliage de cuivre pour tuyaux sans soudure
JP2010222692A (ja) * 2009-03-25 2010-10-07 Sumitomo Light Metal Ind Ltd 給水給湯用銅合金継目無管
JP2010236063A (ja) * 2009-03-31 2010-10-21 Kobelco & Materials Copper Tube Inc 熱交換器用銅合金管

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150003679A (ko) 2013-07-01 2015-01-09 가부시키가이샤 코벨코 마테리아루 도칸 열교환기용 인탈산 구리관
JP2017020063A (ja) * 2015-07-08 2017-01-26 株式会社コベルコ マテリアル銅管 フレア加工用銅又は銅合金管

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CN103415643B (zh) 2015-06-10
JPWO2012128240A1 (ja) 2014-07-24
MY156255A (en) 2016-01-29
KR101385801B1 (ko) 2014-04-16
KR20130105755A (ko) 2013-09-25
CN103415643A (zh) 2013-11-27

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