WO2016088887A1 - アルミニウム合金線材、アルミニウム合金撚線、被覆電線およびワイヤーハーネスならびにアルミニウム合金線材の製造方法 - Google Patents
アルミニウム合金線材、アルミニウム合金撚線、被覆電線およびワイヤーハーネスならびにアルミニウム合金線材の製造方法 Download PDFInfo
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- WO2016088887A1 WO2016088887A1 PCT/JP2015/084195 JP2015084195W WO2016088887A1 WO 2016088887 A1 WO2016088887 A1 WO 2016088887A1 JP 2015084195 W JP2015084195 W JP 2015084195W WO 2016088887 A1 WO2016088887 A1 WO 2016088887A1
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- mass
- wire
- aluminum alloy
- heat treatment
- alloy wire
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 104
- 238000004519 manufacturing process Methods 0.000 title claims description 20
- 239000000463 material Substances 0.000 title abstract description 9
- 150000001875 compounds Chemical class 0.000 claims abstract description 43
- 238000007747 plating Methods 0.000 claims abstract description 34
- 229910052802 copper Inorganic materials 0.000 claims abstract description 30
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 18
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 18
- 229910052709 silver Inorganic materials 0.000 claims abstract description 18
- 229910052796 boron Inorganic materials 0.000 claims abstract description 17
- 239000000203 mixture Substances 0.000 claims abstract description 16
- 239000012535 impurity Substances 0.000 claims abstract description 14
- 229910052742 iron Inorganic materials 0.000 claims abstract description 14
- 229910052735 hafnium Inorganic materials 0.000 claims abstract description 13
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 13
- 229910052706 scandium Inorganic materials 0.000 claims abstract description 13
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 13
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 13
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 13
- 229910052737 gold Inorganic materials 0.000 claims abstract description 9
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims description 133
- 238000001816 cooling Methods 0.000 claims description 26
- 238000005491 wire drawing Methods 0.000 claims description 22
- 230000032683 aging Effects 0.000 claims description 20
- 238000005266 casting Methods 0.000 claims description 18
- 239000010410 layer Substances 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 8
- 239000000956 alloy Substances 0.000 claims description 7
- 238000011282 treatment Methods 0.000 claims description 7
- 239000011247 coating layer Substances 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 abstract description 25
- 229910052749 magnesium Inorganic materials 0.000 abstract description 13
- 230000006866 deterioration Effects 0.000 abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 38
- 239000010949 copper Substances 0.000 description 29
- 239000011777 magnesium Substances 0.000 description 23
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 22
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 21
- 238000000034 method Methods 0.000 description 21
- 230000000694 effects Effects 0.000 description 20
- 239000010936 titanium Substances 0.000 description 18
- 239000011651 chromium Substances 0.000 description 17
- 230000007423 decrease Effects 0.000 description 16
- 239000004020 conductor Substances 0.000 description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 13
- 239000000243 solution Substances 0.000 description 13
- 239000010931 gold Substances 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- 239000010944 silver (metal) Substances 0.000 description 9
- 239000011572 manganese Substances 0.000 description 8
- 239000002245 particle Substances 0.000 description 8
- 239000002244 precipitate Substances 0.000 description 8
- 238000012545 processing Methods 0.000 description 8
- 230000035882 stress Effects 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- 239000013078 crystal Substances 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 6
- 229910018084 Al-Fe Inorganic materials 0.000 description 5
- 229910018192 Al—Fe Inorganic materials 0.000 description 5
- 238000009749 continuous casting Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- 229910000765 intermetallic Inorganic materials 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 229910019018 Mg 2 Si Inorganic materials 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 238000000137 annealing Methods 0.000 description 4
- 238000000265 homogenisation Methods 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 229910000881 Cu alloy Inorganic materials 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 238000004904 shortening Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910018191 Al—Fe—Si Inorganic materials 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 229910019064 Mg-Si Inorganic materials 0.000 description 2
- 229910019406 Mg—Si Inorganic materials 0.000 description 2
- 229910007981 Si-Mg Inorganic materials 0.000 description 2
- 229910008316 Si—Mg Inorganic materials 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
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- 238000005336 cracking Methods 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- -1 Al-Fe-based Chemical class 0.000 description 1
- 229910021365 Al-Mg-Si alloy Inorganic materials 0.000 description 1
- 229910018464 Al—Mg—Si Inorganic materials 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910001369 Brass Inorganic materials 0.000 description 1
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910018643 Mn—Si Inorganic materials 0.000 description 1
- 229910008045 Si-Si Inorganic materials 0.000 description 1
- 229910006411 Si—Si Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910052789 astatine Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009429 electrical wiring Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- SIXSYDAISGFNSX-UHFFFAOYSA-N scandium atom Chemical compound [Sc] SIXSYDAISGFNSX-UHFFFAOYSA-N 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
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- 239000007921 spray Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
-
- 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
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/02—Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
- B22D11/003—Aluminium alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/005—Continuous casting of metals, i.e. casting in indefinite lengths of wire
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
- C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/047—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with magnesium as the next major constituent
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
- H01B1/023—Alloys based on aluminium
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0016—Apparatus or processes specially adapted for manufacturing conductors or cables for heat treatment
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0036—Details
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/02—Single bars, rods, wires, or strips
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/08—Several wires or the like stranded in the form of a rope
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/0045—Cable-harnesses
-
- 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
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/003—Drawing materials of special alloys so far as the composition of the alloy requires or permits special drawing methods or sequences
Definitions
- the present invention relates to an aluminum alloy wire used as a conductor of an electric wiring body, an aluminum alloy twisted wire, a covered electric wire, a wire harness, and an aluminum alloy wire manufacturing method.
- an electric wiring body of a moving body such as an automobile, a train, an aircraft, or an electric wiring body of an industrial robot
- a terminal made of copper or a copper alloy for example, brass
- a so-called wire harness member equipped with a connector has been used.
- the performance and functionality of automobiles have been rapidly advanced, and as a result, the number of various electric devices and control devices mounted on the vehicle has increased, and these devices are used in these devices.
- the means for achieving such weight reduction of the moving body for example, it is considered to replace the conductor of the electric wiring body with a lighter aluminum or aluminum alloy instead of the conventionally used copper or copper alloy. It is being advanced.
- the specific gravity of aluminum is about 1/3 of the specific gravity of copper
- the electrical conductivity of aluminum is about 2/3 of the electrical conductivity of copper (pure aluminum is about 66% IACS when pure copper is used as a standard of 100% IACS).
- the cross-sectional area of the aluminum conductor wire needs to be about 1.5 times the cross-sectional area of the copper conductor wire.
- the above% IACS represents the electrical conductivity when the resistivity 1.7241 ⁇ 10 ⁇ 8 ⁇ m of universal standard annealed copper (International Annealed Copper Standard) is 100% IACS.
- a high-strength aluminum alloy wire for example, an aluminum alloy wire containing Mg and Si is known, and a typical example of the aluminum alloy wire is a 6000 series aluminum alloy (Al—Mg—Si based alloy) wire. Is mentioned.
- the 6000 series aluminum alloy wire can be strengthened by subjecting it to a solution treatment and an aging treatment.
- Patent Document 1 An aluminum having a satisfactory level of high strength, high electrical conductivity, and high elongation even if it is used as an ultrafine wire having a wire diameter of 0.5 mm or less by controlling the precipitation structure by examining components and processes. This makes it possible to produce alloy wires.
- the plating used for improving the plating property include copper plating for reducing the electrical contact resistance of the terminal crimping portion, and chromium plating and nickel plating for improving the corrosion resistance and wear resistance.
- the object of the present invention is to control the particle size and the ratio of the compound existing on the surface of the wire, thereby generating pinholes and irregularities on the surface of the plated film when the plated film is formed on the surface of the wire.
- An object of the present invention is to provide an aluminum alloy wire, an aluminum alloy twisted wire, a covered electric wire and a wire harness, and a method for producing an aluminum alloy wire that are used as a conductor of an electric wiring body and suppress plating.
- the present inventors have conducted research so far and found that there are the following problems, and as a result of repeated studies for solving the problems, the following knowledge has been obtained.
- alumina which is a raw material for aluminum alloy wires, usually contains a large amount of Fe.
- 99.7 mass% aluminum which is a general aluminum ingot, contains 0.2 mass% maximum of Fe (JIS H2102: 2011 (See Table 3).
- Fe contained in aluminum ingots combines with other components such as Al and Si to produce compounds with lower electrical conductivity than the aluminum matrix, and surface defects such as pinholes and irregularities are likely to occur after plating. .
- the surface defects such as pinholes and irregularities generated here cause problems such as deterioration of corrosion resistance, deterioration of appearance, shortening of service life due to stress concentration, and promotion of peeling of plating.
- it is preferable that the Fe content in the aluminum ingot is small.
- the productivity of Al alloy wire rods tends to be low because mass productivity decreases and the effect of reducing the grain size of Fe cannot be obtained. .
- the present inventors have introduced a 6000 series aluminum alloy which is a precipitation-type Al—Mg—Si alloy capable of obtaining high strength and high conductivity, and 1000, 2000, 3000, 4000, 5000, 7000, 8000 series aluminum.
- a 6000 series aluminum alloy which is a precipitation-type Al—Mg—Si alloy capable of obtaining high strength and high conductivity
- 1000, 2000, 3000, 4000, 5000, 7000, 8000 series aluminum we have studied diligently and found that there is a correlation between the particle size and abundance ratio of compounds existing on the surface of the wire and the formation of pinholes on the surface of the plating film when the plating film is formed on the surface of the wire.
- the headline, and the effects of additive components and manufacturing process on the compounds present on the surface of the wire were clarified.
- the present invention was completed by successfully producing a high-strength aluminum alloy wire with good plating properties. It came to.
- the gist configuration of the present invention is as follows. (1) Mg: 0.1 to 1.0 mass%, Si: 0.1 to 1.2 mass%, Fe: 0.10 to 1.40 mass%, Ti: 0 to 0.100 mass%, B : 0 to 0.030 mass%, Cu: 0 to 1.00 mass%, Ag: 0 to 0.50 mass%, Au: 0 to 0.50 mass%, Mn: 0 to 1.00 mass%, Cr : 0 to 1.00% by mass, Zr: 0 to 0.50% by mass, Hf: 0 to 0.50% by mass, V: 0 to 0.50% by mass, Sc: 0 to 0.50% by mass, Co : 0 to 0.50% by mass, Ni: 0 to 0.50% by mass, balance: Al and an inevitable impurity composition, and a compound having a diameter of 1 ⁇ m or more in terms of equivalent circle diameter existing on the surface is 100 ⁇ m
- any of the elements whose lower limit value of the content range is described as “0% by mass” are optionally added as necessary. Means. That is, when the predetermined additive element is “0 mass%”, it means that the additive element is not included.
- the chemical composition is Cu: 0.01 to 1.00% by mass, Ag: 0.01 to 0.50% by mass, Au: 0.01 to 0.50% by mass, Mn: 0.01 to 1.00% by mass, Cr: 0.01-1.00% by mass and Zr: 0.01-0.50% by mass, Hf: 0.01-0.50% by mass, V: 0.01-0. 50% by mass, Sc: 0.01 to 0.50% by mass, Co: 0.01 to 0.50% by mass and Ni: 0.01 to 0.50% by mass ) Or the aluminum alloy wire according to (2).
- (7) has a plated coating on the surface, present on the surface of the plating film, a circular pin hole of at least the diameter 1 ⁇ m in equivalent diameter conversion is one / mm 2 or less above (1) to (6 The aluminum alloy wire according to any one of 1).
- the aluminum alloy wire according to any one of the above (1) to (7) which is an aluminum alloy wire having a strand diameter of 0.1 to 0.5 mm.
- a wire harness comprising the covered electric wire according to (10) and a terminal attached to an end of the covered electric wire from which the covering layer is removed.
- Mg 0.1 to 1.0 mass%, Si: 0.1 to 1.2 mass%, Fe: 0.10 to 1.40 mass%, Ti: 0 to 0.100 mass%, B : 0 to 0.030 mass%, Cu: 0 to 1.00 mass%, Ag: 0 to 0.50 mass%, Au: 0 to 0.50 mass%, Mn: 0 to 1.00 mass%, Cr : 0 to 1.00% by mass, Zr: 0 to 0.50% by mass, Hf: 0 to 0.50% by mass, V: 0 to 0.50% by mass, Sc: 0 to 0.50% by mass, Co : 0 to 0.50% by mass, Ni: 0 to 0.50% by mass, balance: Al and an aluminum alloy material having a composition that is an inevitable impurity are melted, cast, and then hot-worked to form a rough drawn wire.
- At least a method for producing an aluminum alloy wire that performs each step of wire drawing, solution heat treatment, and aging heat treatment,
- the body heat treatment is performed by heating at a predetermined temperature in the range of 450 to 580 ° C., holding for a predetermined time, and then cooling to a temperature of at least 150 ° C. at an average cooling rate of 10 ° C./s or more.
- the average cooling rate in the temperature range from 750 ° C. to 400 ° C. during casting is 20 ° C./s or more, and after the casting, re-heat treatment is performed before the hot working.
- the aluminum alloy wire of the present invention has Mg: 0.1-1.0% by mass, Si: 0.1-1.2% by mass, Fe: 0.10-1.40% by mass, Ti: 0-0. 100 mass%, B: 0 to 0.030 mass%, Cu: 0 to 1.00 mass%, Ag: 0 to 0.50 mass%, Au: 0 to 0.50 mass%, Mn: 0 to 1. 00 mass%, Cr: 0-1.00 mass%, Zr: 0-0.50 mass%, Hf: 0-0.50 mass%, V: 0-0.50 mass%, Sc: 0-0.
- the aluminum alloy wire of the present invention can have sufficient mechanical characteristics even when used for a thin wire having an element wire diameter of 0.5 mm or less. Alternatively, it is useful as a conductor for a motor or a wiring body for an industrial robot.
- FIG. 1 is a surface SEM photograph when the surface of an aluminum alloy wire according to the present invention is observed at a magnification of 1500 times using a scanning electron microscope (SEM).
- FIG. 2 is a surface SEM photograph when the surface of a conventional aluminum alloy wire is observed at a magnification of 1500 times using a scanning electron microscope (SEM).
- Mg manganesium
- Si as a ⁇ ′′ phase (beta double prime phase)
- Mg—Si clusters are elements that have the effect of improving the tensile strength and elongation, however, if the Mg content is less than 0.1% by mass, the above effects are achieved. If the Mg content exceeds 1.0% by mass, the possibility of forming a Mg-concentrated portion at the grain boundary increases, and the tensile strength and elongation decrease.
- the Mg content is preferably 0.5 to 1.0% by mass when high strength is important, and 0.1% when conductivity is important. It is preferable that the content be not less than 0.5% by mass and less than 0.5% by mass. From such a viewpoint, it is preferable that the total is 0.30 to 0.70% by mass.
- Si (silicon) has a function of strengthening by dissolving in an aluminum base material, and a part thereof precipitates together with Mg as a ⁇ ′′ phase and the like, and has an action of improving tensile strength and bending fatigue resistance.
- Si is an element that has the effect of improving tensile strength and elongation when Mg-Si clusters or Si-Si clusters are formed as solute atom clusters. If the Si content is less than 0.1% by mass, When the above-described effects are insufficient, and the Si content exceeds 1.2% by mass, the possibility of forming Si-concentrated portions at the crystal grain boundaries increases, and the tensile strength and elongation decrease.
- the Si content is 0.1 to 1.2% by mass.
- the Si content is preferably 0.5 to 1.2% by mass when importance is placed on high strength, and 0.1% to less than 0.5% by mass when importance is placed on conductivity. From such a viewpoint, it is preferable that the total content is 0.3 to 0.7% by mass.
- Fe is an element that contributes to refinement of crystal grains and mainly improves tensile strength by forming an Al—Fe-based intermetallic compound.
- Fe can only dissolve at 0.05% by mass in Al at 655 ° C. and is even less at room temperature. Therefore, the remaining Fe that cannot be dissolved in Al is Al—Fe, Al—Fe—Si, Al—Fe. Crystallizes or precipitates as an intermetallic compound such as —Si—Mg.
- an intermetallic compound mainly composed of Fe and Al is called an Fe-based compound. This intermetallic compound contributes to the refinement of crystal grains and improves the tensile strength.
- Fe has the effect
- the aluminum alloy wire of the present invention contains Mg, Si and Fe as essential components, but if necessary, any one of Ti and B, Cu, Ag, Au, Mn, At least one of Cr, Zr, Hf, V, Sc, Co and Ni can be contained.
- Ti titanium is an element having an effect of refining the structure of the ingot at the time of melt casting. If the structure of the ingot is coarse, the ingot cracking in the casting or disconnection occurs in the wire processing step, which is not industrially desirable. If the Ti content is less than 0.001% by mass, the above-mentioned effects cannot be fully exhibited, and if the Ti content exceeds 0.100% by mass, the conductivity tends to decrease. It is. Accordingly, the Ti content is set to 0.001 to 0.100 mass%, preferably 0.005 to 0.050 mass%, more preferably 0.005 to 0.030 mass%.
- B boron
- B is an element having an effect of refining the structure of the ingot at the time of melt casting, like Ti.
- a coarse ingot structure is not industrially desirable because it tends to cause ingot cracking and disconnection in the wire processing step during casting.
- the B content is 0.001 to 0.030 mass%, preferably 0.001 to 0.020 mass%, more preferably 0.001 to 0.010 mass%.
- ⁇ Cu 0.01 to 1.00% by mass>, ⁇ Ag: 0.01 to 0.50% by mass>, ⁇ Au: 0.01 to 0.50% by mass>, ⁇ Mn: 0.01 to 1 .00 mass%, ⁇ Cr: 0.01 to 1.00 mass%> and ⁇ Zr: 0.01 to 0.50 mass%>, ⁇ Hf: 0.01 to 0.50 mass%>, ⁇ V : 0.01 to 0.50 mass%, ⁇ Sc: 0.01 to 0.50 mass%>, ⁇ Co: 0.01 to 0.50 mass%> ⁇ Ni: 0.01 to 0.50 mass% %> 1 type or 2 types or more Cu (copper), Ag (silver), Au (gold), Mn (manganese), Cr (chromium), Zr (zirconium), Hf (hafnium), V ( Vanadium), Sc (scandium), Co (cobalt), and Ni (nickel) all have crystal grains refined and are abnormal.
- Cu, Ag, and Au are elements that have the effect of suppressing the formation of coarsely grown grains, and also have the effect of increasing the grain boundary strength by precipitating at the grain boundaries, and at least one of these elements If the seed is contained in an amount of 0.01% by mass or more, the above-described effects can be obtained, and the tensile strength and elongation can be improved. On the other hand, if any of the contents of Cu, Ag, Au, Mn, Cr, Zr, Hf, V, Sc, Co and Ni exceeds the above upper limit values, the compound containing the element becomes coarse. The wire drawing workability is deteriorated and breakage tends to occur, and the electrical conductivity tends to decrease.
- the ranges of the contents of Cu, Ag, Au, Mn, Cr, Zr, Hf, V, Sc, Co, and Ni are set to the ranges specified above.
- Ni is contained, the crystal grain refining effect and the abnormal grain growth suppressing effect become remarkable, the tensile strength and the elongation are improved, and the effect of suppressing the decrease in conductivity and the disconnection during the wire drawing process is recognized. It is. From the viewpoint of satisfying such effects in a balanced manner, the Ni content is more preferably 0.05 to 0.30 mass%.
- the total content of these elements is preferably 2.00% by mass or less. Since Fe is an essential element in the aluminum alloy wire of the present invention, the total content of Fe, Ti, B, Cu, Ag, Au, Mn, Cr, Zr, Hf, V, Sc, Co and Ni is 0.10 to It is preferable to set it as 2.00 mass%. However, when these elements are added alone, the larger the content, the more the compound containing the elements tends to become coarser, which deteriorates the wire drawing workability and easily causes disconnection. It was set as the content range prescribed
- the content of Fe, Ti, B, Cu, Ag, Au, Mn, Cr, Zr, Hf, V, Sc, Co, and Ni The total is particularly preferably 0.10 to 0.80% by mass, and further preferably 0.15 to 0.60% by mass.
- the total content is more than 0.80% by mass and 2.00% by mass in order to further reduce the tensile strength, the elongation, and the yield strength for the tensile strength.
- the content is particularly preferably set to 1.00 to 2.00% by mass.
- Al and inevitable impurities The balance other than the components described above is Al (aluminum) and inevitable impurities.
- the inevitable impurities referred to here mean impurities in a content level that can be unavoidably included in the manufacturing process. Depending on the content of the inevitable impurities, it may be a factor for reducing the electrical conductivity. Therefore, it is preferable to suppress the content of the inevitable impurities to some extent in consideration of the decrease in the electrical conductivity. Examples of components listed as inevitable impurities include Ga (gallium), Zn (zinc), Bi (bismuth), and Pb (lead).
- the present inventors diligently investigated whether there is a correlation between the particle diameter and the existing ratio of the compound existing on the surface of the wire and the formation of pinholes on the surface of the plating film when the plating film is formed on the surface of the wire. Was done.
- the “diameter in terms of equivalent circle diameter” means the diameter of the perfect circle when a perfect circle having the same area as the actual area of the target compound is considered.
- FIG. 1 shows an example of a typical surface SEM photograph when the surface of an aluminum alloy wire (invention product) according to an embodiment of the present invention is observed at a magnification of 1500 times using a scanning electron microscope (SEM).
- FIG. 2 is a surface SEM photograph of the surface of a conventional aluminum alloy wire (conventional product) observed under the same conditions as in FIG. From FIG. 1 and FIG. 2, it can be seen that the number of compounds of 1 ⁇ m or more present on the surface of the aluminum alloy wire is extremely smaller than the conventional products.
- Various compounds can be considered as compounds existing on the surface of the aluminum alloy wire, but mainly Fe-based compounds such as Al-Fe-based, Al-Fe-Si-based, Al-Fe-Si-Mg-based, Al-Fe-based compounds. -Mn-Si compounds and the like.
- the tensile strength of the aluminum alloy wire is required to be 200 MPa or more. If the tensile strength of the aluminum alloy wire is less than 200 MPa, the wire may break when placed in a part where a large tensile force acts as a wire harness on a moving body such as an automobile, and the use part is limited. This is because that. Therefore, the tensile strength of the aluminum alloy wire was set to 200 MPa.
- the film thickness of the surface oxide layer on the surface of the wire is 500 nm or less. This is because if the film thickness is thicker than 500 nm, a long time is required for the pretreatment step of plating for removing the oxide film, and the productivity may be significantly reduced.
- the number of pinholes having a diameter of 1 ⁇ m or more in terms of equivalent circle diameter existing on the surface of the plating film is 1 / mm 2 or less. Therefore, it is possible to suppress a reduction in corrosion resistance, deterioration in appearance, and shortening of the service life due to stress concentration.
- Such an aluminum alloy wire can be realized by controlling the alloy composition and manufacturing process in combination.
- the suitable manufacturing method of the aluminum alloy wire of this invention is demonstrated.
- An aluminum alloy wire according to an embodiment of the present invention includes Mg: 0.1 to 1.0% by mass, Si: 0.1 to 1.2% by mass, Fe: 0.10 to 1.40% by mass, Ti: 0 to 0.100 mass%, B: 0 to 0.030 mass%, Cu: 0 to 1.00 mass%, Ag: 0 to 0.50 mass%, Au: 0 to 0.50 mass%, Mn: 0 to 1.00 mass%, Cr: 0 to 1.00 mass%, Zr: 0 to 0.50 mass%, Hf: 0 to 0.50 mass%, V: 0 to 0.50 mass%, Sc: An aluminum alloy material having a composition of 0 to 0.50 mass%, Co: 0 to 0.50 mass%, Ni: 0 to 0.50 mass%, the balance: Al and inevitable impurities, After forming a rough drawn wire through a hot work, before performing at least the wire drawing, solution heat treatment, and aging heat treatment steps.
- the solution heat treatment is heated at a predetermined temperature in the range of 450 to 580 ° C., held for a predetermined time, and then cooled at an average cooling rate of 10 ° C./s or more to a temperature of at least 150 ° C. , And can be manufactured by a manufacturing method performed by heating to a predetermined temperature within the range of 20 to 250 ° C.
- Specific examples of the method for producing an aluminum alloy wire according to the present invention include [1] melting, [2] casting, [3] hot working (groove roll machining, etc.), [4] first wire drawing, [5] The first heat treatment (intermediate heat treatment), [6] second wire drawing, [7] second heat treatment (solution heat treatment), and [8] third heat treatment (aging heat treatment) are sequentially performed.
- the manufacturing method containing is mentioned. Note that a step of forming a stranded wire or a step of coating a wire with a resin may be provided before or after the second heat treatment or after the aging heat treatment. The steps [1] to [8] will be described below.
- the cooling rate in the temperature range is set to 20 ° C./s or more, and after the casting, re-heat treatment is performed before the hot working, and the re-heat treatment is performed at a predetermined temperature of 400 ° C. or higher.
- the holding time is preferably 10 minutes or less.
- the thickness of the surface oxide layer made of Al oxide or Mg oxide is set to 500 nm or less. Because it can be done.
- the method for setting the average cooling rate in the temperature range from 750 ° C. to 400 ° C. during casting to 20 ° C./s or more is not particularly limited, but for example, a Properti type that combines a cast wheel and a belt.
- a Properti type that combines a cast wheel and a belt.
- a rod having a diameter of 5 to 13 mm can be obtained at an average cooling rate of 20 ° C./sec or more, and an average cooling rate of 30 ° C./sec or more can be obtained by using an underwater spinning method.
- a bar having a diameter of 1 to 13 mm can be obtained.
- Casting and hot rolling may be performed by billet casting or extrusion.
- the degree of work ⁇ is preferably in the range of 1-6.
- the degree of work ⁇ is less than 1, the recrystallized grains are coarsened during the heat treatment in the next step, the tensile strength and elongation are remarkably reduced, and there is a risk of disconnection.
- the processing degree ⁇ is larger than 6, the wire drawing process becomes difficult, and there is a risk of causing a problem in terms of quality such as disconnection during the wire drawing process.
- the surface is cleaned by performing surface peeling, it may not be performed.
- a first heat treatment is performed on the cold-drawn workpiece.
- the first heat treatment of the present invention is performed in order to restore the flexibility of the workpiece and improve the wire drawing workability. If the wire drawing workability is sufficient and disconnection does not occur, the first heat treatment may not be performed.
- the working degree ⁇ is preferably in the range of 1 to 6.
- the degree of work ⁇ affects the formation and growth of recrystallized grains. If the degree of work ⁇ is less than 1, the recrystallized grains tend to be coarsened during the heat treatment in the next step, and the tensile strength and elongation tend to be significantly reduced. This is because it tends to cause problems in terms of quality, such as disconnection during wire drawing. In addition, when not performing 1st heat processing, you may perform 1st wire drawing and 2nd wire drawing continuously.
- Second heat treatment (solution heat treatment) A second heat treatment is applied to the drawn workpiece.
- the second heat treatment of the present invention is a solution heat treatment performed in order to dissolve a randomly contained Mg and Si compound in the aluminum matrix.
- the solution treatment can smoothen (homogenize) the concentrated portion of Mg or Si during processing, leading to suppression of grain boundary segregation of the compound of Mg and Si after the final aging heat treatment.
- the second heat treatment is a heat treatment in which heating is performed to a predetermined temperature within a range of 450 to 580 ° C., and after holding for a predetermined time, cooling is performed at an average cooling rate of 10 ° C./s or more to at least 150 ° C. It is.
- the predetermined temperature during the second heat treatment is higher than 580 ° C.
- the crystal grain size becomes coarse and abnormally grown grains are generated.
- the predetermined temperature is lower than 450 ° C., Mg 2 Si is sufficiently dissolved. I can't let you. Therefore, the predetermined temperature during heating in the second heat treatment is in the range of 450 to 580 ° C., and varies depending on the Mg and Si contents, but is preferably in the range of 450 to 540 ° C., more preferably 480 to 520 ° C. It is desirable that the total time for maintaining the above-described reheat treatment after casting and the first heat treatment (intermediate heat treatment) at 400 ° C. or higher is within 10 minutes.
- the solution heat treatment is heated to a predetermined temperature within the range of 450 to 580 ° C., held for a predetermined time, and then cooled to a temperature of at least 150 ° C. at an average cooling rate of 10 ° C./s or more. To do.
- a method of performing the second heat treatment for example, batch annealing, a salt bath (salt bath), continuous heat treatment such as high-frequency heating, current heating, and running heat may be used.
- the wire temperature usually rises as time passes because it is structured to keep current flowing through the wire. For this reason, if the current is kept flowing, the wire may be melted. Therefore, it is necessary to perform heat treatment in an appropriate time range.
- the temperature of the running annealing furnace is usually set higher than the wire temperature. Since heat treatment for a long time may cause the wire to melt, it is necessary to perform the heat treatment in an appropriate time range.
- the heating and holding times in all the heat treatments require a predetermined time or more in order to dissolve Mg and Si compounds randomly contained in the workpiece into the aluminum matrix.
- the continuous heat treatment by high frequency heating is a heat treatment by Joule heat generated from the wire itself by an induced current as the wire continuously passes through a magnetic field by high frequency. It includes a rapid heating and rapid cooling process, and the wire can be heat-treated under control of the wire temperature and heat treatment time. Cooling is performed by passing the wire continuously in water or in a nitrogen gas atmosphere after rapid heating.
- This heat treatment time is 0.01 to 2 s, preferably 0.05 to 1 s, more preferably 0.05 to 0.5 s.
- the continuous energization heat treatment is a heat treatment by Joule heat generated from the wire itself by passing an electric current through the wire passing continuously through the two electrode wheels. It includes a rapid heating and rapid cooling process, and the wire can be heat-treated under control of the wire temperature and heat treatment time. Cooling is performed by passing the wire continuously through water, air, or a nitrogen gas atmosphere after rapid heating. This heat treatment time is 0.01 to 2 s, preferably 0.05 to 1 s, more preferably 0.05 to 0.5 s.
- the continuous running heat treatment is a heat treatment in which a wire continuously passes through a heat treatment furnace maintained at a high temperature.
- Heat treatment can be performed by controlling the temperature in the heat treatment furnace and the heat treatment time, including rapid heating and rapid cooling processes. Cooling is performed by passing the wire continuously through water, air, or a nitrogen gas atmosphere after rapid heating. This heat treatment time is preferably 0.5 to 30 s.
- the solution formation is incomplete and the solute atomic clusters, ⁇ ′′ phase and Mg 2 Si precipitates generated during the aging heat treatment in the subsequent process are not present.
- partial melting (eutectic melting) of the compound phase in the aluminum alloy wire occurs, the tensile strength and elongation decrease, and breakage tends to occur during handling of the conductor.
- This third heat treatment is an aging heat treatment performed to produce Mg, Si compounds, or solute atom clusters.
- the heating temperature of the aging heat treatment is set to 20 to 250 ° C. If the heating temperature in the aging heat treatment is less than 20 ° C., the formation of solute atomic clusters is slow and it takes time to obtain the necessary tensile strength and elongation, which is disadvantageous in mass production. On the other hand, when the heating temperature is higher than 250 ° C., coarse Mg 2 Si precipitates are generated in addition to Mg 2 Si needle-like precipitates ( ⁇ ′′ phase) that contribute the most to the strength, and the strength decreases.
- the heating temperature in the aging heat treatment is set to 20 to 250 ° C.
- the heating temperature in the aging heat treatment is set to 20 to 20 when it is necessary to generate a solute atomic cluster that is more effective in improving the elongation.
- the temperature is preferably 70 ° C., and the ⁇ ′′ phase is also precipitated at the same time, and when it is necessary to balance the tensile strength and the elongation, the temperature is preferably 100 to 150 ° C.
- the optimal time for heating and holding time in the aging heat treatment varies depending on the temperature. Heating at a low temperature for a long time and heating at a high temperature for a short time is preferable for improving the tensile strength and elongation and reducing the 0.2% proof stress to the tensile strength.
- the long-time heating for example, it is 10 days or less, and in the short-time heating, it is preferably 15 hours or less, more preferably 8 hours or less.
- the cooling in the aging heat treatment is preferably as fast as possible in order to prevent variations in characteristics. Of course, even if it cannot cool quickly in the manufacturing process, it can be appropriately set as long as it is an aging condition that can sufficiently generate the solute atom clusters.
- the wire diameter is not particularly limited and can be appropriately determined according to the application, but in the case of a thin wire, 0.1 to 0.5 mm ⁇ , in the case of a medium thin wire It is preferably 0.8 to 1.5 mm ⁇ .
- the aluminum alloy wire of this embodiment is one of the advantages that it can be used as an aluminum alloy wire by thinning it with a single wire, but it can also be used as an aluminum alloy twisted wire obtained by bundling a plurality of wires, Among the steps [1] to [8] constituting the production method of the present invention, after the aluminum alloy wire materials obtained by sequentially performing the steps [1] to [6] are bundled and twisted, 7) Second heat treatment (solution heat treatment) and [8] Third heat treatment (aging heat treatment) may be performed.
- homogenization heat treatment As an additional process, it is possible to perform a homogenization heat treatment as performed by a conventional method after continuous casting and rolling. Homogenization heat treatment can disperse the added elements uniformly, and it becomes easy to generate solute atomic clusters and ⁇ ”precipitate phases in the crystallized product and the subsequent third heat treatment. It is possible to obtain a more stable improvement in the yield strength against the strength.
- the homogenization heat treatment is preferably performed at a heating temperature of 450 to 600 ° C., more preferably 500 to 600 ° C. Further, the homogenization heat treatment is performed.
- the cooling in is preferably performed at an average cooling rate of 0.1 to 10 ° C./min in that a uniform compound is easily obtained.
- the aluminum alloy wire of the present embodiment can be used as an aluminum alloy wire or an aluminum alloy stranded wire obtained by twisting a plurality of aluminum alloy wires, and further an aluminum alloy wire or an aluminum alloy stranded wire. It can also be used as a covered electric wire having a covering layer on the outer periphery, and in addition, as a wire harness (assembled electric wire) comprising a covered electric wire and a terminal attached to the end of the covered electric wire from which the covering layer has been removed It is also possible to use it.
- a wire harness assembled electric wire
- a first heat treatment (intermediate heat treatment) is performed on the processed material subjected to the first wire drawing under the conditions shown in Table 2, and further, a predetermined degree of processing is obtained up to a wire diameter of ⁇ 0.3 mm. 2 wire drawing was performed.
- a second heat treatment (solution heat treatment) was performed under the conditions shown in Table 2.
- the wire temperature was measured by winding a thermocouple around the wire.
- the fiber type radiation thermometer manufactured by Japan Sensor Co., Ltd.
- the temperature was measured, and the maximum temperature reached was calculated in consideration of Joule heat and heat dissipation.
- the wire temperature near the exit of the heat treatment section was measured.
- a third heat treatment (aging heat treatment) was performed under the conditions shown in Table 1 to produce an aluminum alloy wire.
- the third point is a circle present on the surface of the wire, observed in the range of 1000 ⁇ m 2 at a position on the surface of the wire that is 2000 mm or more from the first point in the longitudinal direction of the wire and 1000 mm or more from the second point in the longitudinal direction of the wire.
- the existence ratio (number / 100 ⁇ m 2 ) of a compound having a particle diameter of 1 ⁇ m or more in terms of equivalent diameter is calculated.
- the diameter was obtained by binarizing the obtained SEM image to determine the area of the compound, and converting the same area to an equivalent circle diameter.
- (B) Measurement of the thickness of the surface oxide layer of the wire The measurement of the thickness of the surface oxide layer of the wire is performed using an Auger electron spectrometer, and the average value calculated from the three measured values is used as the surface oxidation of the wire. Let it be the thickness of the layer.
- the first and second points are spaced 1000 mm or more in the longitudinal direction of the wire, the first and third points are spaced 2000 mm or more in the longitudinal direction of the wire, and the second and third points are spaced 1000 mm or longer in the longitudinal direction of the wire. Open and measure.
- the third point is a pin having a diameter of 1 ⁇ m or more equivalent to a circle existing on the surface of the wire, observed in a range of 1000 ⁇ m 2 at a position distant from the first point by 2000 mm or more and 1000 mm or more from the second point in the longitudinal direction of the wire.
- the hole presence ratio (pieces / mm 2 ) is calculated.
- Comparative Example 4 in which the heating temperature of the solution heat treatment is higher than the range of the present invention and Comparative Example 5 in which the heating temperature of the aging heat treatment is higher than the range of the present invention are both insufficient in tensile strength. Evaluation was unsuccessful.
- the aluminum alloy wire of the present invention can have sufficient mechanical characteristics even when used for a thin wire having an element wire diameter of 0.5 mm or less. Alternatively, it is useful as a conductor for a motor or a wiring body for an industrial robot.
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Abstract
Description
(1) Mg:0.1~1.0質量%、Si:0.1~1.2質量%、Fe:0.10~1.40質量%、Ti:0~0.100質量%、B:0~0.030質量%、Cu:0~1.00質量%、Ag:0~0.50質量%、Au:0~0.50質量%、Mn:0~1.00質量%、Cr:0~1.00質量%、Zr:0~0.50質量%、Hf:0~0.50質量%、V:0~0.50質量%、Sc:0~0.50質量%、Co:0~0.50質量%、Ni:0~0.50質量%、残部:Alおよび不可避不純物である組成を有し、表面に存在する、円相当径換算にて直径1μm以上の化合物が100μm2中に1個以下であり、引張強度が200MPa以上であることを特徴とするアルミニウム合金線材。なお、上記化学組成に含有範囲が挙げられている元素のうち、含有範囲の下限値が「0質量%」と記載されている元素はいずれも、必要に応じて任意に添加される選択添加元素を意味する。すなわち所定の添加元素が「0質量%」の場合、その添加元素が含まれないことを意味する。
<Mg:0.1~1.0質量%>
Mg(マグネシウム)は、アルミニウム母材中に固溶して強化する作用を有すると共に、その一部はSiと一緒にβ”相(ベータダブルプライム相)などとして析出し引張強度を向上させる作用を持つ。また、溶質原子クラスターとしてMg-Siクラスターを形成した場合は、引張強度および伸びを向上させる作用を有する元素である。しかしながら、Mg含有量が0.1質量%未満だと、上記作用効果が不十分であり、また、Mg含有量が1.0質量%を超えると、結晶粒界にMg濃化部分を形成する可能性が高まり、引張強度および伸びが低下する。また、Mg元素の固溶量が多くなることによって0.2%耐力が高くなり、ケーブル化したときの取り回し性が低下するとともに導電率も低下する。したがって、Mg含有量は0.1~1.0質量%とする。なお、Mg含有量は、高強度を重視する場合には0.5~1.0質量%にすることが好ましく、また、導電率を重視する場合には0.1質量%以上0.5質量%未満とすることが好ましく、このような観点から総合的には0.30~0.70質量%とすることが好ましい。
Si(ケイ素)は、アルミニウム母材中に固溶して強化する作用を有すると共に、その一部はMgと一緒にβ”相などとして析出し引張強度、耐屈曲疲労特性を向上させる作用を持つ。またSiは、溶質原子クラスターとしてMg-Siクラスターや、Si-Siクラスターを形成した場合に引張強度および伸びを向上させる作用を有する元素である。Si含有量が0.1質量%未満だと、上記作用効果が不十分であり、また、Si含有量が1.2質量%を超えると、結晶粒界にSi濃化部分を形成する可能性が高まり、引張強度および伸びが低下する。また、Si元素の固溶量が多くなることによって0.2%耐力が高くなり取り回し性が低下するとともに導電率も低下する。したがって、Si含有量は0.1~1.2質量%とする。なお、Si含有量は、高強度を重視する場合には0.5~1.2質量%にすることが好ましく、また、導電率を重視する場合には0.1質量%以上0.5質量%未満とすることが好ましく、このような観点から総合的には0.3~0.7質量%とすることが好ましい。
Fe(鉄)は、主にAl-Fe系の金属間化合物を形成することによって結晶粒の微細化に寄与すると共に、引張強度を向上させる元素である。Feは、Al中に655℃で0.05質量%しか固溶できず、室温では更に少ないため、Al中に固溶できない残りのFeは、Al-Fe、Al-Fe-Si、Al-Fe-Si-Mgなどの金属間化合物として晶出または析出する。これらのようにFeとAlとで主に構成される金属間化合物を本明細書ではFe系化合物と呼ぶ。この金属間化合物は、結晶粒の微細化に寄与すると共に、引張強度を向上させる。また、Feは、Al中に固溶したFeによっても引張強度を向上させる作用を有する。Fe含有量が0.10質量%未満だと、これらの作用効果が不十分であり、また、Fe含有量が1.40質量%超えだと、晶出物または析出物の粗大化により伸線加工性が低下すると共に、0.2%耐力が上昇し取り回し性が低下し、さらに伸びも低下する。したがって、Fe含有量は0.10~1.40質量%とし、好ましくは0.15~0.70質量%、更に好ましくは0.15~0.45質量%とする。
Ti(チタン)は、溶解鋳造時の鋳塊の組織を微細化する作用を有する元素である。鋳塊の組織が粗大であると、鋳造において鋳塊割れや線材加工工程において断線が発生して工業的に望ましくない。Ti含有量が0.001質量%未満であると、上記作用効果を十分に発揮することができず、また、Ti含有量が0.100質量%超えだと導電率が低下する傾向があるからである。したがって、Ti含有量は0.001~0.100質量%とし、好ましくは0.005~0.050質量%、より好ましくは0.005~0.030質量%とする。
B(ホウ素)は、Tiと同様、溶解鋳造時の鋳塊の組織を微細化する作用を有する元素である。鋳塊の組織が粗大であると、鋳造において鋳塊割れや線材加工工程において断線が発生しやすくなるため工業的に望ましくない。B含有量が0.001質量%未満であると、上記作用効果を十分に発揮することができず、また、B含有量が0.030質量%超えだと導電率が低下する傾向がある。したがって、B含有量は0.001~0.030質量%とし、好ましくは0.001~0.020質量%、より好ましくは0.001~0.010質量%とする。
Cu(銅)、Ag(銀)、Au(金)、Mn(マンガン)、Cr(クロム)、Zr(ジルコニウム)、Hf(ハフニウム)、V(バナジウム)、Sc(スカンジウム)、Co(コバルト)およびNi(ニッケル)は、いずれも結晶粒を微細化するとともに、異常な粗大成長粒の生成を抑制する作用を有する元素であり、さらに、Cu、AgおよびAuは、粒界に析出することで粒界強度を高める作用も有する元素であって、これらの元素の少なくとも1種を0.01質量%以上含有していれば、上述した作用効果が得られ、引張強度および伸びを向上させることができる。一方、Cu、Ag、Au、Mn、Cr、Zr、Hf、V、Sc、CoおよびNiの含有量のいずれかが、それぞれ上記の上限値を超えると、該元素を含有する化合物が粗大になり、伸線加工性を劣化させて断線が生じやすくなり、また、導電率が低下する傾向がある。したがって、Cu、Ag、Au、Mn、Cr、Zr、Hf、V、Sc、CoおよびNiの含有量の範囲は、それぞれ上記に規定した範囲とした。なお、これらの元素群の中で、特にNiを含有するのが好ましい。Niを含有すると、結晶粒微細化効果と異常粒成長抑制効果が顕著になり引張強度と伸びが向上し、また、導電率の低下と伸線加工中の断線についても抑制する効果が認められるからである。かかる効果をバランスよく満足させる観点から、Ni含有量は0.05~0.30質量%とするのが更に好ましい。
上述した成分以外の残部はAl(アルミニウム)および不可避不純物である。ここでいう不可避不純物は、製造工程上、不可避的に含まれうる含有レベルの不純物を意味する。不可避不純物は、含有量によっては導電率を低下させる要因にもなりうるため、導電率の低下を加味して不可避不純物の含有量をある程度抑制することが好ましい。不可避不純物として挙げられる成分としては、例えば、Ga(ガリウム)、Zn(亜鉛)、Bi(ビスマス)、Pb(鉛)などが挙げられる。
本発明は、上記化学組成を限定することを前提として、線材表面に存在する、円相当径換算にて直径1μm以上の化合物が100μm2中に1個以下であり、引張強度が200MPa以上であることが必要である。
本発明の一実施例によるアルミニウム合金線材は、Mg:0.1~1.0質量%、Si:0.1~1.2質量%、Fe:0.10~1.40質量%、Ti:0~0.100質量%、B:0~0.030質量%、Cu:0~1.00質量%、Ag:0~0.50質量%、Au:0~0.50質量%、Mn:0~1.00質量%、Cr:0~1.00質量%、Zr:0~0.50質量%、Hf:0~0.50質量%、V:0~0.50質量%、Sc:0~0.50質量%、Co:0~0.50質量%、Ni:0~0.50質量%、残部:Alおよび不可避不純物である組成を有するアルミニウム合金素材を、溶解、鋳造後に、熱間加工を経て荒引線を形成し、その後、少なくとも伸線加工、溶体化熱処理および時効熱処理の各工程を行うことを前提として、溶体化熱処理を、450~580℃の範囲内の所定温度で加熱し、所定の時間保持後、少なくとも150℃の温度までは10℃/s以上の平均冷却速度で冷却し、時効熱処理を、20~250℃の範囲内の所定温度まで加熱することによって行なう製造方法によって製造することができる。
溶解は、上述したアルミニウム合金組成になるように各成分の分量を調整した材料を用意し、それを溶解する。
次いで、鋳造工程では冷却速度を大きくし、化合物、特にFe系化合物の晶出を減少、微細化することが必要であり、この観点から、本発明では、鋳造時における750℃から400℃までの温度範囲での冷却速度を20℃/s以上とし、かつ、前記鋳造後、前記熱間加工前に再熱処理を行い、該再熱処理は、400℃以上の所定温度に加熱し、該所定温度で保持される時間を10分以下とすることが好ましい。ここで、750℃から400℃までの温度範囲での冷却速度を20℃/s以上としたのは、Feの晶出温度領域、Fe系化合物の析出温度域に保たれる時間を短縮しFe系化合物の生成を抑制するためであり、また、鋳造後、熱間加工前に行なう再熱処理において、400℃以上の所定温度に保持される時間を10分以下としたのは、第一に、Fe系化合物の析出温度域に保たれる時間を短縮しFe系化合物の生成を抑制するためであり、第二にAl酸化物やMg酸化物からなる表面酸化物層の厚さを500nm以下とすることができるからである。
次いで、必要であれば表面の皮むきを実施して、例えば直径5~12.5mmφの適宜の太さの棒材とし、これを冷間で伸線加工する。加工度ηは、1~6の範囲であることが好ましい。ここで加工度ηは、伸線加工前の線材断面積をA0、伸線加工後の線材断面積をA1とすると、η=ln(A0/A1)で表される。加工度ηが1未満だと、次工程の熱処理時、再結晶粒が粗大化し、引張強度及び伸びが著しく低下し、断線の原因になるおそれがある。また、加工度ηが6よりも大きいと、伸線加工が困難となり、伸線加工中に断線するなど品質の面で問題を生ずるおそれがあるからである。表面の皮むきは、行うことによって表面の清浄化がなされるが、行わなくてもよい。
次に、冷間伸線した被加工材に第1熱処理を施す。本発明の第1熱処理は、被加工材の柔軟性を取り戻し、伸線加工性を高めるために行うものである。伸線加工性が十分であり、断線が生じなければ第1熱処理は行わなくても良い。金属間化合物の粗大化を防ぎ、表面酸化物層の成長を抑制するために400℃以下で行うことが望ましく、400℃よりも高温に曝される時間を10分未満とすることが望ましい。
上記第1熱処理の後、さらに冷間で伸線加工を施す。この際の加工度ηは1~6の範囲が好ましい。加工度ηは、再結晶粒の形成及び成長に影響を及ぼす。加工度ηが1よりも小さいと、次工程の熱処理時、再結晶粒が粗大化し、引張強度及び伸びが著しく低下する傾向があり、また、加工度ηが6よりも大きいと、伸線加工が困難となり、伸線加工中に断線するなど品質の面で問題を生ずる傾向があるからである。なお、第1熱処理を行わない場合、第1伸線加工と第2伸線加工は連続で行ってもよい。
伸線加工した加工材に第2熱処理を施す。本発明の第2熱処理は、ランダムに含有されているMgとSiの化合物をアルミニウム母相中に溶け込ませるために行う溶体化熱処理である。溶体化処理は、加工中にMgやSiの濃化部分をならす(均質化する)ことができ、最終的な時効熱処理後でのMgとSiの化合物の粒界偏析の抑制につながる。第2熱処理は、具体的には、450~580℃の範囲内の所定温度まで加熱し、所定の時間保持後、少なくとも150℃の温度までは10℃/s以上の平均冷却速度で冷却する熱処理である。第2熱処理の加熱時の所定温度が580℃よりも高いと、結晶粒径が粗大化し、異常成長粒が生成し、前記所定温度が450℃よりも低いと、Mg2Siを十分に固溶させることができない。したがって、第2熱処理における加熱時の所定温度は450~580℃の範囲とし、Mg、Si含有量によっても変化するが、好ましくは450~540℃、より好ましくは480~520℃の範囲とする。上述した、鋳造後の再熱処理と第1熱処理(中間熱処理)とを合わせた400℃以上に保持する時間の合計は、10分以内にすることが望ましい。また、少なくとも150℃の温度までの平均冷却速度は、10℃/sよりも遅いと、アルミニウム母相中に一旦固溶させてMgとSiが、Mg、Si化合物として再析出しやすくなる。よって、本発明では、溶体化熱処理を、450~580℃の範囲内の所定温度まで加熱し、所定の時間保持後、少なくとも150℃の温度までは10℃/s以上の平均冷却速度で冷却することにより行なうこととする。
次いで、第3熱処理を施す。この第3熱処理は、Mg、Si化合物または、溶質原子クラスターを生成させるために行う時効熱処理である。本発明では、時効熱処理の加熱温度を20~250℃とする。時効熱処理における加熱温度は、20℃未満であると、溶質原子クラスターの生成が遅く必要な引張強度と伸びを得るために時間が掛かるため量産的に不利である。また、前記加熱温度が250℃よりも高いと、強度に最も寄与するMg2Si針状析出物(β”相)の他に、粗大なMg2Si析出物が生成し強度が低下する。このため、本発明では、時効熱処理の加熱温度を20~250℃とする。なお、時効熱処理における加熱温度は、より伸びの向上に効果のある溶質原子クラスターを生成させる必要がある場合には20~70℃であることが好ましく、また、β”相も同時に析出させ、引張強度と伸びのバランスを取る必要がある場合には、100~150℃であることが好ましい。
Mg、Si、Fe及びAlと、選択的に添加するTi、B、Cu、Ag、Au、Mn、Cr、Zr、Hf、V、Sc、CoおよびNiを、表1に示す含有量(質量%)になるようにプロペルチ式の連続鋳造圧延機を用いて、溶湯を水冷した鋳型で、表2に示す条件で連続的に鋳造しながら圧延を行い、φ9mmの棒材とした。次いで、該棒材を所定の加工度が得られるように第1伸線加工を施した。次に、この第1伸線加工を施した加工材に、表2に示す条件で第1熱処理(中間熱処理)を施し、さらにφ0.3mmの線径まで所定の加工度が得られるように第2伸線加工を行った。次に、表2に示す条件で第2熱処理(溶体化熱処理)を施した。第1及び第2熱処理とも、バッチ式熱処理では、線材に熱電対を巻きつけて線材温度を測定した。連続通電熱処理では、線材の温度が最も高くなる部分での測定が設備上困難であるため、ファイバ型放射温度計(ジャパンセンサ社製)で線材の温度が最も高くなる部分よりも手前の位置にて温度を測定し、ジュール熱と放熱を考慮して最高到達温度を算出した。高周波加熱および連続走間熱処理では、熱処理区間出口付近の線材温度を測定した。第2熱処理後に、表1に示す条件で第3熱処理(時効熱処理)を施し、アルミニウム合金線を製造した。
(A)線材表面に存在する化合物の粒子径および存在割合の測定
走査型電子顕微鏡(SEM)を用いて、線材表面に存在する化合物の粒子径および存在割合、具体的には線材表面に存在する、円相当径換算にて直径1μm以上の粒子径の存在割合を以下の手法で測定する。一点目は線材表面の任意の位置にて1000μm2の範囲で観察する。二点目は一点目から線材の長手方向に1000mm以上離れた線材表面の位置にて1000μm2の範囲で観察する。三点目は一点目から線材の長手方向に2000mm以上、かつ二点目から線材の長手方向に1000mm以上離れた線材表面の位置にて1000μm2の範囲で観察し、線材表面に存在する、円相当径換算にて直径1μm以上の粒子径をもつ化合物の存在割合(個/100μm2)を算出する。なお、前記直径は、得られたSEM画像を二値化し化合物の面積を求め、同じ面積から円相当径に換算して求めた。
線材の表面酸化層の膜厚測定は、オージェ電子分光器を用いて測定し、合計三点の測定値から算出した平均値を、線材の表面酸化層の膜厚とする。一点目と二点目は線材の長手方向に1000mm以上間隔をあけ、一点目と三点目は線材の長手方向に2000mm以上、二点目と三点目は線材の長手方向に1000mm以上間隔をあけて測定する。
JIS Z 2241:2011に準じて各3本ずつの供試材(アルミニウム合金線)について引張試験を行い、引張強度および破断伸びの平均値を求めた。引張強度は電線と端子の接続部における圧着部の引張強度を保つため、また、車体への取付け作業時に不意に負荷される荷重に耐えられるためにも、200MPa以上を合格レベルとした。
長さ300mmの試験片を20℃(±0.5℃)に保持した恒温漕中で、四端子法を用いて各3本ずつの供試材(アルミニウム合金線)について比抵抗を測定し、その平均導電率を算出した。端子間距離は200mmとした。導電率は、45%IACS以上を合格レベルとした。
走査型電子顕微鏡(SEM)を用いて、線材表面に存在するピンホールの直径および存在割合、具体的には線材表面に存在する、円相当径換算にて直径1μm以上のピンホールの存在割合を以下の手法で測定する。一点目は線材表面の任意の位置にて1000μm2の範囲で観察する。二点目は一点目から線材の長手方向に1000mm以上離れた位置にて1000μm2の範囲で観察する。三点目は線材の長手方向に一点目から2000mm以上、二点目から1000mm以上離れた位置にて1000μm2の範囲で観察し、線材表面に存在する、円相当直径1μm以上の直径をもつピンホールの存在割合(個/mm2)を算出する。
JIS Z 2371:2015に記載の中性塩水噴霧試験を96時間行い、試験後の外観評価にて二段階に分類した。殆ど悪化が見られない場合を「○」、悪化した場合を「×」としてめっき性を評価した。
表3中に示す総合判定は、以下の表4に示す基準に従って「A」~「D」の4段階で行ない、「A」、「B」および「C」を合格レベルとし、「D」を不合格とした。
Claims (13)
- Mg:0.1~1.0質量%、Si:0.1~1.2質量%、Fe:0.10~1.40質量%、Ti:0~0.100質量%、B:0~0.030質量%、Cu:0~1.00質量%、Ag:0~0.50質量%、Au:0~0.50質量%、Mn:0~1.00質量%、Cr:0~1.00質量%、Zr:0~0.50質量%、Hf:0~0.50質量%、V:0~0.50質量%、Sc:0~0.50質量%、Co:0~0.50質量%、Ni:0~0.50質量%、残部:Alおよび不可避不純物である組成を有し、表面に存在する、円相当径換算にて直径1μm以上の化合物が100μm2中に1個以下であり、引張強度が200MPa以上であることを特徴とするアルミニウム合金線材。
- 前記化学組成が、Ti:0.001~0.100質量%とB:0.001~0.030質量%のうち両方かいずれかひとつを含有する請求項1に記載のアルミニウム合金線材。
- 前記化学組成が、Cu:0.01~1.00質量%、Ag:0.01~0.50質量%、Au:0.01~0.50質量%、Mn:0.01~1.00質量%、Cr:0.01~1.00質量%およびZr:0.01~0.50質量%、Hf:0.01~0.50質量%、V:0.01~0.50質量%、Sc:0.01~0.50質量%、Co:0.01~0.50質量%およびNi:0.01~0.50質量%のうち、少なくともひとつを含有する請求項1または2に記載のアルミニウム合金線材。
- Fe、Ti、B、Cu、Ag、Au、Mn、Cr、Zr、Hf、V、Sc、CoおよびNiの含有量の合計が0.10~2.00質量%である請求項1、2または3に記載のアルミニウム合金線材。
- 前記化合物が Fe系化合物である請求項1~4のいずれか1項に記載のアルミニウム合金線材。
- 表面酸化層の膜厚 が500nm以下である請求項1~5のいずれか1項に記載のアルミニウム合金線材。
- 表面上にめっき被膜を有し、該めっき被膜の表面上に存在する、円相当径換算にて直径1μm以上のピンホールが1個/mm2以下である請求項1~6のいずれか1項に記載のアルミニウム合金線材。
- 素線径が0.1~0.5mmであるアルミニウム合金線である請求項1~7のいずれか1項に記載のアルミニウム合金線材。
- 請求項8に記載のアルミニウム合金線を複数本撚り合わせて得られるアルミニウム合金撚線。
- 請求項8に記載のアルミニウム合金線または請求項9に記載のアルミニウム合金撚線の外周に被覆層を有する被覆電線。
- 請求項10に記載の被覆電線と、該被覆電線の、前記被覆層を除去した端部に装着された端子とを具えるワイヤーハーネス。
- Mg:0.1~1.0質量%、Si:0.1~1.2質量%、Fe:0.10~1.40質量%、Ti:0~0.100質量%、B:0~0.030質量%、Cu:0~1.00質量%、Ag:0~0.50質量%、Au:0~0.50質量%、Mn:0~1.00質量%、Cr:0~1.00質量%、Zr:0~0.50質量%、Hf:0~0.50質量%、V:0~0.50質量%、Sc:0~0.50質量%、Co:0~0.50質量%、Ni:0~0.50質量%、残部:Alおよび不可避不純物である組成を有するアルミニウム合金素材を、溶解、鋳造後に、熱間加工を経て荒引線を形成し、その後、少なくとも伸線加工、溶体化熱処理および時効熱処理の各工程を行うアルミニウム合金線材の製造方法であって、前記溶体化熱処理は、450~580℃の範囲内の所定温度まで加熱し、所定の時間保持後、少なくとも150℃の温度までは10℃/s以上の平均冷却速度で冷却することによって行ない、前記時効熱処理は、20~250℃の範囲内の所定温度で行なうことを特徴とするアルミニウム合金線材の製造方法。
- 鋳造時における750℃から400℃までの温度範囲での平均冷却速度が20℃/s以上であり、前記鋳造後、前記熱間加工前に再熱処理を行い、該再熱処理は、400℃以上の所定温度に加熱し、該所定温度で保持される時間が10分以下で行なう請求項12に記載のアルミニウム合金線材の製造方法。
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