WO2013018821A1 - 継目無管、レベルワウンドコイル及びクロスフィンチューブ型熱交換器及びその製造方法 - Google Patents
継目無管、レベルワウンドコイル及びクロスフィンチューブ型熱交換器及びその製造方法 Download PDFInfo
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- WO2013018821A1 WO2013018821A1 PCT/JP2012/069557 JP2012069557W WO2013018821A1 WO 2013018821 A1 WO2013018821 A1 WO 2013018821A1 JP 2012069557 W JP2012069557 W JP 2012069557W WO 2013018821 A1 WO2013018821 A1 WO 2013018821A1
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- Prior art keywords
- seamless
- seamless pipe
- tube
- level
- wound coil
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B21/00—Pilgrim-step tube-rolling, i.e. pilger mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B23/00—Tube-rolling not restricted to methods provided for in only one of groups B21B17/00, B21B19/00, B21B21/00, e.g. combined processes planetary tube rolling, auxiliary arrangements, e.g. lubricating, special tube blanks, continuous casting combined with tube rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/04—Making uncoated products by direct extrusion
- B21C23/08—Making wire, bars, tubes
- B21C23/10—Making finned tubes
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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
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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
- C22C9/06—Alloys based on copper with nickel or cobalt as the next major constituent
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/02—Rigid pipes of metal
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- 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
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- 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
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- 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
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- 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
Definitions
- the present invention relates to a seamless pipe used for heat transfer pipes or refrigerant pipes for air conditioner heat exchangers, refrigerators, and the like.
- the present invention also relates to a level wound coil in which the seamless tube is wound.
- the present invention also relates to a cross fin tube type heat exchanger in which the seamless pipe is assembled and a method for manufacturing the same.
- 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 International Publication No. 2008/041777
- Patent Document 2 Japanese Unexamined Patent Publication No. 2003-268467
- Patent Document 3 Japanese Patent Publication No. 51-16891
- a heat exchanger for an air conditioner such as a packaged air conditioner in which a seamless pipe made of a copper alloy as described in Patent Document 1 or 2 is used, a refrigerator, etc.
- the recycling destination of seamless pipes made of copper alloy is limited by the presence of a large amount of alloying elements added in addition to copper, and seamless pipes made of copper alloy The value as a recycled material becomes low.
- the use destination is restricted and the melting furnace is contaminated by the added alloying elements. Occurs.
- the copper material that does not contain a large amount of alloying elements that impede recyclability is used as the copper material that forms the seamless pipe, and it is desired to reduce the thickness while increasing the pressure strength. There is a request.
- 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.
- U bending hairpin 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. Specifically, 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 ratio of the wall thickness to the outer diameter (t / D) is specifically 0.
- the thickness is reduced to 0.04 or less and the hairpin bending pitch is small and the hairpin bending is performed under severe conditions, it is increasingly difficult to perform normal hairpin bending.
- Patent Document 3 describes that by adding Fe to a seamless tube, the strength is increased and workability such as hairpin bending is improved.
- the copper alloy seamless pipe of Patent Document 3 has a large outer diameter and a t / D larger than 0.04, and has been made thinner and thinner as required in recent years. It wasn't.
- an object of the present invention is to provide a seamless tube having a high strength and capable of normally performing hairpin bending in a seamless tube having a small diameter and a reduced thickness.
- the present inventors have obtained a tensile strength by adding a specific amount of a specific element to a phosphorous deoxidized copper. Even though the thickness ( ⁇ B) is high, a 0.2% proof stress ( ⁇ 0.2) is low, and a seamless tube having a high elongation ( ⁇ ) is obtained, and the tensile strength ( ⁇ B) is in a specific range.
- the seamless tube having a 0.2% proof stress ( ⁇ 0.2) and elongation ( ⁇ ) in a specific range is capable of performing normal hairpin bending despite its high strength.
- the headline and the present invention have been completed.
- the present invention (1) is a seamless tube for a heat transfer tube of a cross fin tube type heat exchanger
- the seamless pipe material is a copper alloy containing 0.01 to 0.06% by mass of Fe and 0.004 to 0.040% by mass of P, the balance being Cu and inevitable impurities
- the ratio (t / D) of the wall thickness (mm) to the outer diameter (mm) of the seamless pipe is 0.04 or less
- the seamless pipe has a tensile strength ( ⁇ B) of 245 MPa or more, 0.2% proof stress ( ⁇ 0.2) is 130 MPa or less, Elongation ( ⁇ ) is 40% or more
- a seamless tube characterized by the above is provided.
- the present invention (2) is a level wound coil produced by winding a seamless tube and making it into a multilayered winding in a cylindrical shape,
- the material of the seamless tube wound around the level-wound coil contains 0.01 to 0.06 mass% Fe and 0.004 to 0.040 mass% P, and the balance Cu and unavoidable impurities.
- 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 0.04 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 present invention (3) is a cross fin tube obtained by bending a seamless tube unwound from the coil of the present invention (1) or the coil of the present invention (2) by bending the hairpin and assembling it to an aluminum fin.
- a mold heat exchanger is provided.
- the seamless pipe of the present invention (1) or the seamless pipe unwound from the coil of the present invention (2) is bent with a hairpin, assembled to an aluminum fin, and subjected to a cross fin tube type heat exchange.
- the present invention provides a method for producing a cross-fin tube heat exchanger characterized in that a heat exchanger is obtained.
- the present invention (5) is a seamless tube for a heat transfer tube of a cross fin tube type heat exchanger
- the seamless pipe material is a copper alloy containing 0.04 to 0.06 mass% Ni and 0.004 to 0.040 mass% P, the balance being Cu and inevitable impurities,
- the ratio (t / D) of the wall thickness (mm) to the outer diameter (mm) of the seamless pipe is 0.04 or less
- the seamless pipe has a tensile strength ( ⁇ B) of 245 MPa or more, 0.2% proof stress ( ⁇ 0.2) is 130 MPa or less, Elongation ( ⁇ ) is 40% or more,
- a seamless tube characterized by the above is provided.
- the present invention (6) is a level wound coil produced by winding a seamless tube and making it into a multilayered winding in a cylindrical shape,
- the material of the seamless pipe wound around the level-wound coil contains 0.04 to 0.06% by mass of Ni and 0.004 to 0.040% by mass of P.
- 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 0.04 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 present invention (7) is a cross fin tube obtained by bending a seamless tube unwound from the coil of the present invention (5) or the coil of the present invention (6) by hairpin bending and assembling it to an aluminum fin.
- a mold heat exchanger is provided.
- the seamless pipe of the present invention (5) or the seamless pipe unwound from the coil of the present invention (6) is bent with a hairpin, assembled to an aluminum fin, and subjected to a cross fin tube type heat exchange.
- the present invention provides a method for producing a cross-fin tube heat exchanger characterized in that a heat exchanger is obtained.
- the seamless pipe of the first aspect of the present invention (hereinafter also referred to as the seamless pipe (1) of the present invention) is a seamless pipe for a heat transfer tube of a cross fin tube type heat exchanger,
- the seamless pipe material is a copper alloy containing 0.01 to 0.06% by mass of Fe and 0.004 to 0.040% by mass of P, the balance being Cu and inevitable impurities,
- the ratio (t / D) of the wall thickness (mm) to the outer diameter (mm) of the seamless pipe is 0.04 or less
- the seamless pipe has a tensile strength ( ⁇ B) of 245 MPa or more, 0.2% proof stress ( ⁇ 0.2) is 130 MPa or less, Elongation ( ⁇ ) is 40% or more, It is a seamless tube characterized by.
- the seamless tube (1) 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 (1) of the present invention is manufactured by manufacturing a cross fin tube type heat exchanger by performing hairpin bending and assembling the fin material when manufacturing the cross fin tube type heat exchanger. The seamless tube used.
- the material of the seamless pipe (1) of the present invention is a copper alloy obtained by adding a small amount of Fe to phosphorous deoxidized copper, and does not contain a large amount of alloying elements that impede recyclability.
- the copper alloy according to the seamless pipe (1) of the present invention contains 0.01 to 0.06 mass% Fe and 0.004 to 0.040 mass% P, and consists of the balance Cu and inevitable impurities.
- the copper alloy according to the seamless pipe (1) of the present invention contains 0.01 to 0.06% by mass of Fe, preferably 0.025 to 0.040% by mass of Fe.
- This is a seamless tube in which the thickness ( ⁇ B), 0.2% proof stress ( ⁇ 0.2) and elongation ( ⁇ ) are appropriately balanced.
- Phosphorous deoxidized copper containing no Fe has a 0.2% proof stress ( ⁇ 0.2) and a low elongation ( ⁇ ) when the required tensile strength ( ⁇ B) is satisfied by work hardening. Therefore, it was very difficult to balance them.
- the improvement of the tensile strength ( ⁇ B) due to work hardening of the copper material is slightly suppressed, and the inclusion of 0.01 to 0.06% by mass of Fe increases the strength by adding Fe.
- the seamless pipe (1) of the present invention containing the Fe element in the above range is different from the seamless pipe made of phosphorous-deoxidized copper, and in the production of the seamless pipe, the tensile strength ( ⁇ B) , 0.2% proof stress ( ⁇ 0.2) and elongation ( ⁇ ) can be easily adjusted to the ranges specified in the seamless pipe (1) of the present invention.
- a seamless pipe made of phosphorous deoxidized copper it is possible to adjust the tensile strength ( ⁇ B), 0.2% proof stress ( ⁇ 0.2), and elongation ( ⁇ ) to the ranges specified in the present invention. difficult.
- the Fe content in the copper alloy is less than 0.01% by mass, the increase in strength is insufficient, and the effect of the present invention to achieve thinning cannot be obtained, and if it exceeds 0.06% by mass, In addition to obstructing the recyclability, it increases the yield strength and hinders bending workability such as hairpin bending.
- the Fe content of the copper alloy according to the seamless pipe of the present invention is 0.025 to 0.040% by mass, the increase of 0.2% proof stress ( ⁇ 0.2) and elongation ( ⁇ ). Since the effect of improving the tensile strength ( ⁇ B) can be increased while suppressing the decrease, the seamless pipe can be extremely thinned, for example, t / D can be 0.035 or less. In terms, it is preferable.
- P in the copper alloy is added for the purpose of deoxidation.
- the P content of the copper alloy according to the seamless pipe of the present invention is 0.004 to 0.040 mass%, deoxidation in the material becomes sufficient.
- the P content in the copper alloy is less than 0.004% by mass, deoxidation is insufficient, and when it exceeds 0.040% by mass, the thermal conductivity of the copper alloy is lowered.
- the ratio (t / D) of the wall thickness (mm) to the outer diameter (mm) of the seamless pipe (1) of the present invention is 0.04 or less, preferably 0.02 to 0.04, particularly preferably 0.8. 02 to 0.035.
- 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 (1) 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 (1) of the present invention is 245 MPa or more, preferably 245 to 265 MPa.
- the tensile strength ( ⁇ B) of the seamless pipe (1) of the present invention is 245 MPa or more, preferably 245 to 265 MPa.
- a sufficient pressure resistance can be obtained even by thinning.
- the tensile strength of the seamless pipe is less than the above range, the pressure resistance is insufficient when the thickness is reduced. If the tensile strength of the seamless pipe exceeds 265 MPa, it becomes difficult to make the 0.2% yield strength ( ⁇ 0.2) 130 MPa or less and the elongation ( ⁇ ) 40% or more.
- the 0.2% proof stress ( ⁇ 0.2) of the seamless pipe (1) of the present invention is 130 MPa or less, preferably 80 to 120 MPa.
- the elongation ( ⁇ ) of the seamless pipe (1) 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 20 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 (1) of the present invention include an inner smooth pipe (bearing pipe) in which no inner groove is formed and an inner grooved pipe in which an inner 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.
- a seamless tube having a large t / D specifically, a seamless tube having a t / D exceeding 0.04 is relatively easy to bend a hairpin. Therefore, when t / D is large, specifically, When t / D exceeds 0.04, it is easy to obtain a seamless tube having high strength and good hairpin bending workability without strictly defining 0.2% proof stress and elongation.
- the t / D of the seamless pipe becomes small, it becomes difficult to perform the hairpin bending process.
- t / D is 0.04 or less, the 0.2% proof stress and the elongation are not specified, and the hairpin bending process is performed. It is difficult to obtain a seamless tube with good properties.
- the diameter is reduced, specifically, when the outer diameter is 3 to 8 mm (or the outer diameter is 4 to 7 mm), it becomes more difficult to obtain a seamless tube with good hairpin bending workability.
- the seamless pipe (1) of the present invention has a thin t / D of 0.04 or less because the Fe content is in the above range and the 0.2% proof stress and elongation are in the above range. However, the strength is high and the hairpin bending workability is good. Furthermore, the seamless pipe (1) of the present invention has a thickness of t / D of 0.04 or less because the Fe content is in the above range and the 0.2% proof stress and elongation are in the above range. Even if it is thin and has an outer diameter of 3 to 8 mm (or an outer diameter of 4 to 7 mm), it has high strength and good hairpin bending workability. In particular, when the Fe content of the seamless pipe (1) of the present invention is 0.025 to 0.040 mass%, the hairpin bending workability is improved even if the strength is as high as 280 MPa or more. .
- the level-wound coil of the first aspect of the present invention (hereinafter also referred to as the level-wound coil (1) of the present invention) is a level-wound produced by winding a seamless pipe and forming a cylindrically aligned multilayer winding. Coil, The material of the seamless tube wound around the level-wound coil contains 0.01 to 0.06 mass% Fe and 0.004 to 0.040 mass% P, and the balance Cu and unavoidable impurities.
- 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 0.04 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.
- the seamless tube is usually unwound from a coil wound with a seamless tube, and the unwound seamless tube is subjected to hairpin bending, but the coil is cylindrical. It is often a level-wound coil with aligned multi-layer windings. 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.
- a seamless pipe is unwound from the inner side or outer side of the level-wound coil when a cross fin tube type heat exchanger is manufactured, but when a 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 in a range in which the 0.2% proof stress ( ⁇ 0.2) of the seamless pipe wound is taken into account the increase when unrolled.
- the material of the seamless pipe wound around the level wound coil is 0.01 to 0.06 mass% Fe and 0.004 to 0.040 mass% P. It is a copper alloy which contains and consists of remainder Cu and inevitable impurities.
- the Fe content of the seamless pipe wound around the level wound coil is preferably 0.025 to 0.040 mass%.
- the copper alloy according to the level wound coil (1) of the present invention is the same as the copper alloy according to the seamless pipe (1) 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 of the seamless pipe (1) of the present invention. Same as t.
- 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 0.04 or less, preferably It is 0.02 to 0.04, particularly preferably 0.02 to 0.035.
- the tensile strength ( ⁇ B) of the seamless pipe wound around the level wound coil is 245 MPa or more, preferably 245 to 265 MPa.
- the seamless pipe after being unwound from the level-wound coil, that is, the cross fin tube type heat exchanger The tensile strength ( ⁇ B) of the seamless pipe subjected to hairpin bending for production can be 245 MPa or more, preferably 245 to 265 MPa.
- the 0.2% proof stress ( ⁇ 0.2) of the seamless tube wound around the level wound coil is preferably 120 MPa or less, particularly 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 type
- the 0.2% proof stress ( ⁇ 0.2) of a seamless pipe subjected to hairpin bending for the production of a heat exchanger can be 130 MPa or less, preferably 80 to 120 MPa.
- the level wound coil is a level wound coil that is unwound from the inner surface side
- the work hardening applied to the seamless pipe is large, so after the unwinding from the level wound coil
- the level wound coil that is unwound from the inner surface side is made of a material of 0.01 to 0.00 mm from the seamless pipe wound around the level wound coil.
- Level Wound Coil which is a copper alloy containing 06 mass% Fe, preferably 0.025 to 0.040 mass% Fe and 0.004 to 0.040 mass% P, the balance being Cu and inevitable impurities
- the ratio (t / D) of the wall thickness (mm) to the outer diameter (mm) of the seamless pipe wound around is 0.04 or less, preferably 0.02 to 0.04, particularly preferably 0.8.
- the tensile strength ( ⁇ B) of the seamless pipe wound around the level wound coil is 245 MPa or more, preferably 245 to 265 MPa, and the 0.2% proof stress ( ⁇ 0.2) is 110 MPa.
- the level wound coil is preferably 80 to 100 MPa and has an elongation ( ⁇ ) of 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 used for hairpin processing is 245 MPa or more, preferably 245 to 265 MPa.
- the 0.2% proof stress ( ⁇ 0.2) is 130 MPa or less, preferably 80 to 120 MPa, and the elongation ( ⁇ ) is 40% or more, preferably 40 to 55%.
- the cross fin tube heat exchanger of the first aspect of the present invention (hereinafter also referred to as the cross fin tube heat exchanger (1) of the present invention) is the seamless pipe (1) of the present invention or the above. It is a cross fin tube type heat exchanger obtained by bending a seamless pipe unwound from the level wound coil (1) of the present invention into a hairpin and assembling it to an aluminum fin.
- the manufacturing method of the cross fin tube type heat exchanger of the first aspect of the present invention (hereinafter also referred to as the manufacturing method (1) of the cross fin tube type heat exchanger of the present invention) is the seamless of the present invention.
- the seamless pipe of the second aspect of the present invention (hereinafter also referred to as the seamless pipe (2) of the present invention) is a seamless pipe for a heat transfer tube of a cross fin tube type heat exchanger,
- the seamless pipe material is a copper alloy containing 0.04 to 0.06 mass% Ni and 0.004 to 0.040 mass% P, the balance being Cu and inevitable impurities,
- the ratio (t / D) of the wall thickness (mm) to the outer diameter (mm) of the seamless pipe is 0.04 or less
- the seamless pipe has a tensile strength ( ⁇ B) of 245 MPa or more, 0.2% proof stress ( ⁇ 0.2) is 130 MPa or less, Elongation ( ⁇ ) is 40% or more, It is a seamless tube characterized by.
- the seamless pipe (2) of the present invention is a seamless pipe for a heat transfer tube of a cross fin tube type heat exchanger.
- the seamless pipe (2) of the present invention is manufactured in the production of a cross fin tube type heat exchanger by performing a hairpin bending process and assembling the fin material at the time of production of the cross fin tube type heat exchanger.
- the material of the seamless pipe (2) of the present invention is a copper alloy obtained by adding a small amount of Ni to phosphorous deoxidized copper, and does not contain a large amount of alloying elements that impede recyclability.
- the copper alloy according to the seamless pipe (2) of the present invention contains 0.04 to 0.06 mass% Ni and 0.004 to 0.040 mass% P, and consists of the balance Cu and inevitable impurities.
- the copper alloy according to the seamless pipe (2) of the present invention contains 0.04 to 0.06 mass% of Ni
- the tensile strength ( ⁇ B), 0.2% proof stress ( ⁇ 0.2), and elongation ( ⁇ ) is a seamless tube with a proper balance.
- the 0.2% yield strength ( ⁇ 0.2) increases and the elongation ( ⁇ ) decreases. . Therefore, it was very difficult to balance them.
- the improvement of the tensile strength ( ⁇ B) due to the work hardening of the copper material is slightly suppressed, and Ni is contained in an amount of 0.04 to 0.06% by mass, thereby adding Ni.
- ⁇ B tensile strength
- Ni is contained in an amount of 0.04 to 0.06% by mass, thereby adding Ni.
- the seamless pipe (2) of the present invention containing Ni atoms in the above range is different from the seamless pipe made of phosphorous deoxidized copper in that the tensile strength ( ⁇ B) , 0.2% proof stress ( ⁇ 0.2) and elongation ( ⁇ ) can be easily adjusted to the ranges specified in the seamless pipe (2) of the present invention.
- a seamless pipe made of phosphorous deoxidized copper it is possible to adjust the tensile strength ( ⁇ B), 0.2% proof stress ( ⁇ 0.2), and elongation ( ⁇ ) to the ranges specified in the present invention. difficult.
- Ni content in the copper alloy is less than 0.04% by mass, the increase in strength is insufficient, and the effect of the present invention to reduce the thickness cannot be obtained, and if it exceeds 0.06% by mass, In addition to obstructing the recyclability, it increases the yield strength and hinders bending workability such as hairpin bending.
- P in the copper alloy is added for the purpose of deoxidation.
- the P content of the copper alloy according to the seamless pipe (2) of the present invention is 0.004 to 0.040 mass%, deoxidation in the material becomes sufficient.
- the P content in the copper alloy is less than 0.004% by mass, deoxidation is insufficient, and when it exceeds 0.040% by mass, the thermal conductivity of the copper alloy is lowered.
- the ratio (t / D) of the wall thickness (mm) to the outer diameter (mm) of the seamless pipe (2) of the present invention is 0.04 or less, preferably 0.02 to 0.04, particularly preferably 0.8. 02 to 0.035.
- 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 (2) 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 (2) of the present invention is 245 MPa or more, preferably 245 to 265 MPa.
- ⁇ B The tensile strength of the seamless pipe (2) of the present invention.
- the 0.2% proof stress ( ⁇ 0.2) of the seamless pipe (2) of the present invention is 130 MPa or less, preferably 80 to 120 MPa.
- the elongation ( ⁇ ) of the seamless pipe (2) of the present invention is 40% or more, preferably 40 to 55%.
- the 0.2% proof stress ( ⁇ 0.2) and elongation ( ⁇ ) of the seamless pipe are in the above ranges, the hairpin bending workability is improved.
- the 0.2% proof stress of the seamless pipe exceeds the above range and the elongation is below the above range, it becomes difficult to perform strong processing with a small bending pitch P, and the inner portion of the bend is formed during hairpin bending processing. Wrinkles may occur, the tube may become flattened, and in extreme cases it may be damaged.
- Examples of the seamless tube (2) 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 seamless pipe (2) of the present invention has a Ni content in the above range and a 0.2% proof stress and elongation in the above range. However, the strength is high and the hairpin bending workability is good. Furthermore, the seamless pipe (2) of the present invention has a thickness of t / D of 0.04 or less because the Ni content is in the above range and the 0.2% proof stress and elongation are in the above range. Even if it is thin and has an outer diameter of 3 to 8 mm (or an outer diameter of 4 to 7 mm), it has high strength and good hairpin bending workability.
- the level-wound coil according to the second aspect of the present invention (hereinafter also referred to as the level-wound coil (2) of the present invention) is a level-wound produced by winding a seamless pipe and forming a cylindrically aligned multilayer winding. Coil, The material of the seamless pipe wound around the level-wound coil contains 0.04 to 0.06% by mass of Ni and 0.004 to 0.040% by mass of P.
- 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 0.04 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.
- the material of the seamless pipe wound around the level wound coil is 0.04 to 0.06 mass% Ni and 0.004 to 0.040 mass% P. It is a copper alloy which contains and consists of remainder Cu and inevitable impurities.
- the copper alloy according to the level wound coil (2) of the present invention is the same as the copper alloy according to the seamless pipe (2) 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 of the seamless pipe (2) of the present invention. Same as t.
- 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 0.04 or less, preferably It is 0.02 to 0.04, particularly preferably 0.02 to 0.035.
- the tensile strength ( ⁇ B) of the seamless pipe wound around the level wound coil is 245 MPa or more, preferably 245 to 265 MPa.
- the seamless pipe after being unwound from the level-wound coil, that is, the cross fin tube type heat exchanger The tensile strength ( ⁇ B) of the seamless pipe subjected to hairpin bending for production can be 245 MPa or more, preferably 245 to 265 MPa.
- the 0.2% proof stress ( ⁇ 0.2) of the seamless tube wound around the level wound coil is preferably 120 MPa or less, particularly 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 type
- the 0.2% proof stress ( ⁇ 0.2) of a seamless pipe subjected to hairpin bending for the production of a heat exchanger can be 130 MPa or less, preferably 80 to 120 MPa.
- the level wound coil is a level wound coil that is unwound from the inner surface side
- the work hardening applied to the seamless pipe is large, so after the unwinding from the level wound coil
- the level wound coil that is unwound from the inner surface side is made from 0.04 to 0.00 mm in the material of the seamless pipe wound around the level wound coil.
- a copper alloy containing 06 mass% Ni and 0.004 to 0.040 mass% P, the balance being Cu and inevitable impurities, and the outer diameter (mm) of the seamless pipe wound around the level wound coil The ratio (t / D) of the wall thickness (mm) to 0.04 or less, preferably 0.02 to 0.04, particularly preferably 0.02 to 0.035.
- the seamless pipe has a tensile strength ( ⁇ B) of 245 MPa or more, preferably 245 to 265 MPa, a 0.2% proof stress ( ⁇ 0.2) of 110 MPa or less, preferably 80 to 100 MPa, and an elongation ( ⁇ ) Is 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 in the above ranges.
- the tensile strength ( ⁇ B) of the seamless pipe after being unwound from the level wound coil, that is, the seamless pipe used for hairpin processing is 245 MPa or more, preferably 245 to 265 MPa.
- the 0.2% proof stress ( ⁇ 0.2) is 130 MPa or less, preferably 80 to 120 MPa, and the elongation ( ⁇ ) is 40% or more, preferably 40 to 55%.
- the cross fin tube heat exchanger of the second aspect of the present invention (hereinafter also referred to as the cross fin tube heat exchanger (2) of the present invention) is the seamless pipe (2) of the present invention or the above. It is a cross fin tube type heat exchanger obtained by bending a seamless tube unwound from the level wound coil (2) of the present invention into a hairpin and assembling it to an aluminum fin.
- the manufacturing method of the cross fin tube type heat exchanger of the second aspect of the present invention (hereinafter also referred to as the manufacturing method (2) of the cross fin tube type heat exchanger of the present invention) is the seamless of the present invention.
- a cross-fin tube heat exchanger is obtained by bending a seamless tube unwound from the tube (2) or the level wound coil (2) of the present invention and hairpin bending it and assembling it to an aluminum fin. It is a manufacturing method of a mold heat exchanger.
- 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, a hot extrusion process, a cold working process, and a final heat treatment process in order, and a hot extrusion process and a final heat treatment process.
- This is a seamless pipe manufacturing method in which no intermediate annealing treatment is performed.
- the casting process, the hot extrusion process, the cold working process, and the final heat treatment process are performed in this order.
- performing these in order does not mean that the hot extrusion process is performed immediately after the casting process, the cold processing process is performed immediately after the hot extrusion process, and the final heat treatment process is performed immediately after the cold processing 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 heat treatment process is performed after the cold working process.
- the manufacturing method of the seamless pipe of the second aspect of the present invention includes a casting process, a hot extrusion process, a cold working process, an intermediate annealing process (A), a rolling process process, and a final heat treatment.
- the process is a seamless pipe manufacturing method in which other intermediate annealing processes are not performed between the hot extrusion process and the intermediate annealing process (A).
- a casting process, a hot extrusion process, a cold working process, an intermediate annealing process (A), a rolling process process, a final heat treatment 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. It does not mean that the rolling process is performed immediately after the processing (A), and the final heat treatment process is 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 heat treatment process is performed after the rolling 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. It is a step of obtaining a billet that is blended by content.
- a predetermined element is a predetermined element. It is a step of obtaining a billet that is blended by content.
- a copper ingot, an in-process recycled material, a Cu—Fe master alloy, a Cu—P master alloy, etc. are blended, and Fe and The components are adjusted so that the P content becomes a predetermined content.
- the components are adjusted so that the Ni and P contents become predetermined contents, and then a billet is cast using a high-frequency melting furnace or the like.
- 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 heat treatment process of the seamless pipe after the cold working obtained by performing the cold working process is performed.
- the holding temperature and holding time of the final heat treatment step are 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 holding temperature is preferably 400 to 650 ° C. If the holding temperature is less than 400 ° C., a long-time heat treatment is required, resulting in a decrease in productivity. In some cases, annealing may be insufficient, and if it exceeds 650 ° C., significant grain growth occurs. This causes strength reduction and workability reduction.
- the total working degree (cross-sectional reduction rate) of the cold working process during this period 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)
- the intermediate annealing process is not performed and the total workability of the cold work process is not performed.
- the holding temperature in the final heat treatment step within the above range the tensile strength ( ⁇ B) of the seamless pipe obtained by the final heat treatment is 245 MPa or more, preferably 245 to 265 MPa, 0.2
- The% proof stress ( ⁇ 0.2) can be 130 MPa or less, preferably 80 to 120 MPa, and the elongation ( ⁇ ) can be 40% or more, preferably 40 to 55%.
- the seamless pipe (1) or (2) of the present invention can be obtained by performing the seamless pipe manufacturing method of the first aspect of the present invention.
- a cold-worked seamless pipe obtained by performing a cold-working process subsequent to the cold-working process is heated to 400 to 700 ° C.
- An intermediate annealing process (A) is performed by heating at the holding temperature.
- the holding temperature and holding time in the intermediate annealing process (A) are preferably the minimum conditions that allow the predetermined inner surface groove formation by the rolling process, that is, the temperature is as low as possible and the time is as short as possible. .
- the intermediate annealing process (A) is a heat treatment before the rolling process.
- a rolling process step is then performed to roll the seamless pipe after the intermediate annealing treatment (A).
- 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 heat treatment step is then performed on the internally grooved tube after the rolling process obtained by performing the rolling process step.
- the holding temperature in the final heat treatment step is preferably 400 to 650 ° C.
- the treatment time of the final heat treatment step 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.
- heat processing such as another intermediate annealing process, is not performed between a hot extrusion process and an intermediate annealing process (A).
- the total working degree (cross-sectional reduction rate) of the cold working process during this period is 99.5% or more, and the final heat treatment process can be performed by setting the holding temperature of the final heat treatment process in the above range.
- the tensile strength ( ⁇ B) of the seamless pipe is 245 MPa or more, preferably 245 to 265 MPa, the 0.2% proof stress ( ⁇ 0.2) is 130 MPa or less, preferably 80 to 120 MPa, and the elongation ( ⁇ ) is 40% or more.
- it can be 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)).
- the seamless pipe (1) or (2) 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.
- Example in case a seamless pipe is an internal grooved pipe is shown.
- the copper alloy ingots shown in Tables 1 to 4 were melted and cast to produce billets for hot extrusion.
- 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 dimensions of the original pipe are 12.7 mm in outer diameter and 11.1 mm in inner diameter, and the degree of work in the entire cold drawing is 92.4% in terms of the cross-sectional reduction rate.
- the total degree of cold drawing that is, the total degree of cold working was 99.2% in terms of cross-sectional reduction, and the ball was rolled in the same manner to obtain an internally grooved tube B having the following dimensions.
- -Heat treatment method performed in a roller hearth continuous annealing furnace.
- the holding temperature is as shown in Tables 1 to 4, the heating rate 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. Minutes.
- -Tensile strength ( ⁇ B), 0.2% proof stress ( ⁇ 0) of seamless pipe (LWC) after final heat treatment .
- the elongation ( ⁇ ) is shown in Tables 1 to 4.
- 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).
- Tables 1 to 4 show the tensile strength ( ⁇ B), 0.2% proof stress ( ⁇ 0.2) and elongation ( ⁇ ) of seamless tubes (for heat transfer tubes of cross fin tube type heat exchangers).
- ⁇ Hairpin bending test method The position where the shoulder of the one-neck swing ball mandrel and the bending start position of the bending mold are aligned on a straight line is 0 point, and the mandrel position is 2.0 in the direction away from the bending R part. The hairpin processability was evaluated while shifting within a range of ⁇ 5.5 mm.
- Flatness ratio (%) ((maximum outer diameter ⁇ minimum outer diameter) / nominal outer diameter) ⁇ 100
- the measurement positions are 45 °, 90 °, and 135 ° positions of the hairpin bending portion, and the nominal outer diameter is 7.0 mm in this example.
- 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, which was regarded as acceptable ( ⁇ ).
- the seamless pipe of the present invention is a copper material that does not contain a large amount of alloying elements that impede recyclability, and is a seamless pipe that has high strength and can bend hairpins normally.
- the heat transfer tube can be thinned, and the cross fin tube heat exchanger manufactured by assembling the seamless tube of the present invention can be easily recycled after being discarded.
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Abstract
Description
該継目無管の材質が、0.01~0.06質量%のFe及び0.004~0.040質量%のPを含有し、残部Cu及び不可避不純物からなる銅合金であり、
該継目無管の外径(mm)に対する肉厚(mm)の比(t/D)が0.04以下であり、
該継目無管の引張強さ(σB)が245MPa以上であり、
0.2%耐力(σ0.2)が130MPa以下であり、
伸び(δ)が40%以上であること、
を特徴とする継目無管を提供するものである。
該レベルワウンドコイルに巻かれている該継目無管の材質が、0.01~0.06質量%のFe及び0.004~0.040質量%のPを含有し、残部Cu及び不可避不純物からなる銅合金であり、
該レベルワウンドコイルに巻かれている該継目無管の外径(mm)に対する肉厚(mm)の比(t/D)が0.04以下であり、
該レベルワウンドコイルに巻かれている継目無管の引張強さ(σB)が245MPa以上であり、
0.2%耐力(σ0.2)が130MPa以下であり、
伸び(δ)が40%以上であること、
を特徴とするレベルワウンドコイルを提供するものである。
該継目無管の材質が、0.04~0.06質量%のNi及び0.004~0.040質量%のPを含有し、残部Cu及び不可避不純物からなる銅合金であり、
該継目無管の外径(mm)に対する肉厚(mm)の比(t/D)が0.04以下であり、
該継目無管の引張強さ(σB)が245MPa以上であり、
0.2%耐力(σ0.2)が130MPa以下であり、
伸び(δ)が40%以上であること、
を特徴とする継目無管を提供するものである。
該レベルワウンドコイルに巻かれている該継目無管の材質が、0.04~0.06質量%のNi及び0.004~0.040質量%のPを含有し、残部Cu及び不可避不純物からなる銅合金であり、
該レベルワウンドコイルに巻かれている該継目無管の外径(mm)に対する肉厚(mm)の比(t/D)が0.04以下であり、
該レベルワウンドコイルに巻かれている継目無管の引張強さ(σB)が245MPa以上であり、
0.2%耐力(σ0.2)が130MPa以下であり、
伸び(δ)が40%以上であること、
を特徴とするレベルワウンドコイルを提供するものである。
該継目無管の材質が、0.01~0.06質量%のFe及び0.004~0.040質量%のPを含有し、残部Cu及び不可避不純物からなる銅合金であり、
該継目無管の外径(mm)に対する肉厚(mm)の比(t/D)が0.04以下であり、
該継目無管の引張強さ(σB)が245MPa以上であり、
0.2%耐力(σ0.2)が130MPa以下であり、
伸び(δ)が40%以上であること、
を特徴とする継目無管である。
該レベルワウンドコイルに巻かれている該継目無管の材質が、0.01~0.06質量%のFe及び0.004~0.040質量%のPを含有し、残部Cu及び不可避不純物からなる銅合金であり、
該レベルワウンドコイルに巻かれている該継目無管の外径(mm)に対する肉厚(mm)の比(t/D)が0.04以下であり、
該レベルワウンドコイルに巻かれている継目無管の引張強さ(σB)が245MPa以上であり、
0.2%耐力(σ0.2)が130MPa以下であり、
伸び(δ)が40%以上であること、
を特徴とするレベルワウンドコイルである。
該継目無管の材質が、0.04~0.06質量%のNi及び0.004~0.040質量%のPを含有し、残部Cu及び不可避不純物からなる銅合金であり、
該継目無管の外径(mm)に対する肉厚(mm)の比(t/D)が0.04以下であり、
該継目無管の引張強さ(σB)が245MPa以上であり、
0.2%耐力(σ0.2)が130MPa以下であり、
伸び(δ)が40%以上であること、
を特徴とする継目無管である。
該レベルワウンドコイルに巻かれている該継目無管の材質が、0.04~0.06質量%のNi及び0.004~0.040質量%のPを含有し、残部Cu及び不可避不純物からなる銅合金であり、
該レベルワウンドコイルに巻かれている該継目無管の外径(mm)に対する肉厚(mm)の比(t/D)が0.04以下であり、
該レベルワウンドコイルに巻かれている継目無管の引張強さ(σB)が245MPa以上であり、
0.2%耐力(σ0.2)が130MPa以下であり、
伸び(δ)が40%以上であること、
を特徴とするレベルワウンドコイルである。
断面減少率(%)=((管の加工前の断面積-管の加工後の断面積)/(管の加工前の断面積))×100 (1)
継目無素管内に、外面にらせん状の溝加工を施した転造プラグを配置して、高速回転する複数の転造ボールによって、管の外側から押圧して、管の内面に転造プラグの溝を転写することにより行われる。また、通常、中間焼鈍処理(A)を行った後、縮径加工を行ってから、転造加工工程を行う。
・フィン高さをh(mm)、肉厚(底肉厚)をt(mm)としたとき、
h/tが、0.50~1.2
・リード角をθ(°)、フィン頂角をα(°)としたとき、
θ/αが、0.70以上
なお、フィン高さh、肉厚(底肉厚)t、フィン頂角αは、図2中の符号h、t及びαである。また、リード角θとは、継目無管の管軸方向に対する内面溝の傾斜角である。
(1)表1~表4に示す銅合金鋳塊を溶解及び鋳造し、熱間押出用のビレットを作製した。
(2)上記ビレットを加熱し、850℃にて熱間押出を行い、押出素管を得た。次いで、熱間押出した押出素管を、水中に押出して急冷した。
・押出前に熱間で内径約75mm穿孔した。
・押出素管の外径は102mm、内径は75mmであった。
(3)上記押出素管を、ビルガーミル圧延機によって冷間圧延し、圧延素管を得た。
・圧延素管の外径は46mm、内径は39.8mmであった。
・冷間圧延での加工度(断面減少率)は、88.9%であった。
断面減少率(%)=((加工前の断面積-加工後の断面積)/加工前の断面積)×100
(4)上記の圧延素管を、冷間にて抽伸を複数回行い、抽伸素管を得た。
・抽伸素管の寸法(管外径、内径)、冷間抽伸全体での加工度(断面減少率)及び冷間加工の総加工度(断面減少率)を、表1~表4に示す。
(5)上記の抽伸素管を中間焼鈍し、転造工程に供するための原管を得た。
・中間焼鈍の保持温度を、表1~表4に示す。
・原管の0.2%耐力(σ0.2)を、表1~表4に示す。
(6)上記の原管を、ボール転造加工して、内面溝付管Aを得た。
<内面溝付管Aの寸法諸元>
・外径:7.0mm
・肉厚(図2中、符号t):0.26mm
・フィン高さ(図2中、符号h):0.22mm
・フィン頂角(図2中、符号α):13°
・溝条数:44条
・リード角θ:28°
なお、一部の実施例では、原管の寸法を外径12.7mm、内径11.1mmとし、冷間抽伸全体での加工度は、断面減少率で92.4%、冷間圧延及び冷間抽伸の総加工度、すなわち、冷間加工の総加工度は、断面減少率で99.2%として、同様にボール転造加工して下記寸法諸元の内面溝付管Bとした。
<内面溝付管Bの寸法諸元>
・外径:7.0mm
・肉厚(図2中、符号t):0.23mm
・フィン高さ(図2中、符号h):0.22mm
・フィン頂角(図2中、符号α):13°
・溝条数:44条
・リード角θ:28°
また、参考例1では、原管の寸法を外径12.7mm、内径11.1mmとし、冷間抽伸全体での加工度は、断面減少率で92.4%、冷間圧延及び冷間抽伸の総加工度、すなわち、冷間加工の総加工度は、断面減少率で99.2%として、同様にボール転造加工して下記寸法諸元の内面溝付管Cとした。
<内面溝付管Cの寸法諸元>
・外径:7.0mm
・肉厚(図2中、符号t):0.32mm
・フィン高さ(図2中、符号h):0.22mm
・フィン頂角(図2中、符号α):13°
・溝条数:44条
・リード角θ:28°
(7)上記の内面溝付管を、円筒状の整列多層巻きに巻き取り、内面側から巻き解かれる方式のLWCを作製した。その後、下記の条件の最終熱処理を行い、継目無管(レベルワウンドコイル(LWC))を得た。
・熱処理方法:ローラーハース連続焼鈍炉にて行った。
・条件:保持温度は表1~表4に示す通りであり、昇温速度は25℃から保持温度まで5.0℃/分であり、冷却速度は保持温度から25℃まで2.2℃/分であった。
・最終熱処理後の継目無管(LWC)の引張強さ(σB)、0.2%耐力(σ0
.2)、伸び(δ)を表1~表4に示す。
(8)上記のLWCの内面側から継目無管を巻き解き、継目無管(クロスフィンチューブ型熱交換器の伝熱管用)を得た。
・継目無管(クロスフィンチューブ型熱交換器の伝熱管用)の引張強さ(σB)、0.2%耐力(σ0.2)及び伸び(δ)を表1~表4に示す。
(9)上記の継目無管(クロスフィンチューブ型熱交換器の伝熱管用)を用い、下記の条件にてヘアピン曲げ加工試験を行い、加工性を評価した。その結果を表1に示す。
・ヘアピン曲げ加工試験の方法:片首振りボールマンドレルの肩部と曲げ金型の曲げ開始位置が一直線上に並んだ位置を0点とし、曲げ型R部から遠ざかる方向へマンドレル位置を2.0~5.5mmの範囲でずらしながら、ヘアピン加工性の評価を行った。
・ヘアピン曲げ加工試験の条件:ボールマンドレル外径が5.90mm、曲げピッチが20mm
・各実施例及び比較例の継目無管について、20本ずつ試験を行った。
<評価>
(I)しわ発生
ヘアピン曲げの内側部分にしわが発生している継目無管の数を数え、下記式にて、しわ発生率を求めた。しわ発生率が0%の場合を合格(○)とした。
しわ発生率(%)=(しわが発生した管の本数/試験した管の本数)×100
(II)扁平率
ヘアピン曲げ後の曲げ部の扁平率を下記にて算出した。
扁平率(%)=((最大外径-最小外径)/呼称外径)×100
なお、測定位置は、ヘアピン曲げ部の45°、90°、135°位置であり、呼称外径は、本例では7.0mmである。なお、ヘアピン曲げ部の45°、90°、135°とは、図1に示すように、継目無管を45°曲げた位置(符号a)、90°曲げた位置(符号b)、135°曲げた位置(符号c)である。
試験した各継目無管の扁平率を求め、扁平率の平均値が15%以下の場合を合格(○)とした。
<引張強さ(σB)、0.2%耐力(σ0.2)、伸び(δ)>
継目無管の引張強さ(σB)、0.2%耐力(σ0.2)、伸び(δ)は、JIS Z2241に準拠して測定した。
P 曲げピッチ
t 肉厚(底肉厚)
h フィン高さ
s 内面溝の最も深い位置
α フィン頂角
Claims (14)
- クロスフィンチューブ型熱交換器の伝熱管用の継目無管であって、
該継目無管の材質が、0.01~0.06質量%のFe及び0.004~0.040質量%のPを含有し、残部Cu及び不可避不純物からなる銅合金であり、
該継目無管の外径(mm)に対する肉厚(mm)の比(t/D)が0.04以下であり、
該継目無管の引張強さ(σB)が245MPa以上であり、
0.2%耐力(σ0.2)が130MPa以下であり、
伸び(δ)が40%以上であること、
を特徴とする継目無管。 - Feの含有量が0.025~0.040質量%であることを特徴とする請求項1記載の継目無管。
- 内面に複数の螺旋溝が設けられている内面溝付管であることを特徴とする請求項1又は2いずれか1項記載の継目無管。
- 継目無管を巻き回し、円筒状に整列多層巻きにして作製されたレベルワウンドコイルであり、
該レベルワウンドコイルに巻かれている該継目無管の材質が、0.01~0.06質量%のFe及び0.004~0.040質量%のPを含有し、残部Cu及び不可避不純物からなる銅合金であり、
該レベルワウンドコイルに巻かれている該継目無管の外径(mm)に対する肉厚(mm)の比(t/D)が0.04以下であり、
該レベルワウンドコイルに巻かれている継目無管の引張強さ(σB)が245MPa以上であり、
0.2%耐力(σ0.2)が130MPa以下であり、
伸び(δ)が40%以上であること、
を特徴とするレベルワウンドコイル。 - Feの含有量が0.025~0.040質量%であることを特徴とする請求項3記載のレベルワウンドコイル。
- 前記レベルワウンドコイルが、コイル軸を垂直に配置して、前記コイルの円筒状の内面側から前記継目無管が巻き解かれるレベルワウンドコイルであることを特徴とする請求項4又は5いずれか1項記載のレベルワウンドコイル。
- 請求項1~3いずれか1項記載の継目無管又は請求項4又は5いずれか1項記載のコイルより巻き解いた継目無管をヘアピン曲げし、アルミニウムフィンに組み付けることにより得られたクロスフィンチューブ型熱交換器。
- 請求項1~3いずれか1項記載の継目無管又は請求項4又は5いずれか1項記載のコイルより巻き解いた継目無管をヘアピン曲げし、アルミニウムフィンに組み付けて、クロスフィンチューブ型熱交換器を得ることを特徴とするクロスフィンチューブ型熱交換器の製造方法。
- クロスフィンチューブ型熱交換器の伝熱管用の継目無管であって、
該継目無管の材質が、0.04~0.06質量%のNi及び0.004~0.040質量%のPを含有し、残部Cu及び不可避不純物からなる銅合金であり、
該継目無管の外径(mm)に対する肉厚(mm)の比(t/D)が0.04以下であり、
該継目無管の引張強さ(σB)が245MPa以上であり、
0.2%耐力(σ0.2)が130MPa以下であり、
伸び(δ)が40%以上であること、
を特徴とする継目無管。 - 内面に複数の螺旋溝が設けられている内面溝付管であることを特徴とする請求項1に記載の継目無管。
- 継目無管を巻き回し、円筒状に整列多層巻きにして作製されたレベルワウンドコイルであり、
該レベルワウンドコイルに巻かれている該継目無管の材質が、0.04~0.06質量%のNi及び0.004~0.040質量%のPを含有し、残部Cu及び不可避不純物からなる銅合金であり、
該レベルワウンドコイルに巻かれている該継目無管の外径(mm)に対する肉厚(mm)の比(t/D)が0.04以下であり、
該レベルワウンドコイルに巻かれている継目無管の引張強さ(σB)が245MPa以上であり、
0.2%耐力(σ0.2)が130MPa以下であり、
伸び(δ)が40%以上であること、
を特徴とするレベルワウンドコイル。 - 前記レベルワウンドコイルが、コイル軸を垂直に配置して、前記コイルの円筒状の内面側から前記継目無管が巻き解かれるレベルワウンドコイルであることを特徴とする請求項11記載のレベルワウンドコイル。
- 請求項9又は10いずれか1項記載の継目無管又は請求項11又は12いずれか1項記載のコイルより巻き解いた継目無管をヘアピン曲げし、アルミニウムフィンに組み付けることにより得られたクロスフィンチューブ型熱交換器。
- 請求項9又は10いずれか1項記載の継目無管又は請求項11又は12いずれか1項記載のコイルより巻き解いた継目無管をヘアピン曲げし、アルミニウムフィンに組み付けて、クロスフィンチューブ型熱交換器を得ることを特徴とするクロスフィンチューブ型熱交換器の製造方法。
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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KR20150003679A (ko) * | 2013-07-01 | 2015-01-09 | 가부시키가이샤 코벨코 마테리아루 도칸 | 열교환기용 인탈산 구리관 |
CN113249619A (zh) * | 2021-06-24 | 2021-08-13 | 北京科技大学 | δ相强化镍基高温合金的基体成分设计方法 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5116891B1 (ja) * | 1970-03-30 | 1976-05-28 | ||
JPS52156720A (en) * | 1976-06-23 | 1977-12-27 | Furukawa Metals Co | Copper alloy with anti softening property |
JPS5476428A (en) * | 1977-11-30 | 1979-06-19 | Mitsubishi Metal Corp | Seamless pipe-forming cu alloy |
JPS5492516A (en) * | 1977-12-29 | 1979-07-21 | Mitsubishi Metal Corp | Cu alloy for manufacture of seamless pipe |
JPS5547338A (en) * | 1978-10-02 | 1980-04-03 | Hitachi Cable Ltd | Softening resisting copper alloy |
JP2002147981A (ja) * | 2000-11-07 | 2002-05-22 | Kobe Steel Ltd | 伝熱管及びフィンチューブ型熱交換器 |
JP2009226426A (ja) * | 2008-03-21 | 2009-10-08 | Sumitomo Light Metal Ind Ltd | クロスフィンチューブ型熱交換器用銅管 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
ATE499577T1 (de) * | 2004-05-05 | 2011-03-15 | Luvata Oy | Aus einer zinn-messing-legierung hergestelltes wärmeübertragungsrohr |
CN201173728Y (zh) * | 2007-12-14 | 2008-12-31 | 华南理工大学 | 一种无缝内螺纹传热管 |
JP5446163B2 (ja) * | 2008-08-04 | 2014-03-19 | ダイキン工業株式会社 | 熱交換器用溝付き管 |
-
2012
- 2012-08-01 KR KR1020147005750A patent/KR20140066180A/ko not_active Application Discontinuation
- 2012-08-01 MY MYPI2014000288A patent/MY166376A/en unknown
- 2012-08-01 WO PCT/JP2012/069557 patent/WO2013018821A1/ja active Application Filing
- 2012-08-01 CN CN201280037064.8A patent/CN103765152A/zh active Pending
- 2012-08-01 JP JP2013526941A patent/JP6114939B2/ja active Active
-
2015
- 2015-12-08 JP JP2015239528A patent/JP2016121396A/ja active Pending
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5116891B1 (ja) * | 1970-03-30 | 1976-05-28 | ||
JPS52156720A (en) * | 1976-06-23 | 1977-12-27 | Furukawa Metals Co | Copper alloy with anti softening property |
JPS5476428A (en) * | 1977-11-30 | 1979-06-19 | Mitsubishi Metal Corp | Seamless pipe-forming cu alloy |
JPS5492516A (en) * | 1977-12-29 | 1979-07-21 | Mitsubishi Metal Corp | Cu alloy for manufacture of seamless pipe |
JPS5547338A (en) * | 1978-10-02 | 1980-04-03 | Hitachi Cable Ltd | Softening resisting copper alloy |
JP2002147981A (ja) * | 2000-11-07 | 2002-05-22 | Kobe Steel Ltd | 伝熱管及びフィンチューブ型熱交換器 |
JP2009226426A (ja) * | 2008-03-21 | 2009-10-08 | Sumitomo Light Metal Ind Ltd | クロスフィンチューブ型熱交換器用銅管 |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20150003679A (ko) * | 2013-07-01 | 2015-01-09 | 가부시키가이샤 코벨코 마테리아루 도칸 | 열교환기용 인탈산 구리관 |
CN104278170A (zh) * | 2013-07-01 | 2015-01-14 | 株式会社科倍可菱材料 | 热交换器用磷脱氧铜管 |
JP2015010264A (ja) * | 2013-07-01 | 2015-01-19 | 株式会社コベルコ マテリアル銅管 | 熱交換器用りん脱酸銅管 |
KR101627919B1 (ko) | 2013-07-01 | 2016-06-07 | 가부시키가이샤 코벨코 마테리아루 도칸 | 열교환기용 인탈산 구리관 |
CN113249619A (zh) * | 2021-06-24 | 2021-08-13 | 北京科技大学 | δ相强化镍基高温合金的基体成分设计方法 |
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