CN103339276A - Aluminum alloy wire for use in bolts, bolt, and manufacturing method of these. - Google Patents
Aluminum alloy wire for use in bolts, bolt, and manufacturing method of these. Download PDFInfo
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- CN103339276A CN103339276A CN2012800070380A CN201280007038A CN103339276A CN 103339276 A CN103339276 A CN 103339276A CN 2012800070380 A CN2012800070380 A CN 2012800070380A CN 201280007038 A CN201280007038 A CN 201280007038A CN 103339276 A CN103339276 A CN 103339276A
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- aluminum alloy
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 102
- 238000004519 manufacturing process Methods 0.000 title claims description 25
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 22
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 16
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 16
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 60
- 238000012545 processing Methods 0.000 claims description 48
- 238000000034 method Methods 0.000 claims description 43
- 238000005096 rolling process Methods 0.000 claims description 41
- 238000005491 wire drawing Methods 0.000 claims description 21
- 238000000137 annealing Methods 0.000 claims description 18
- 230000035882 stress Effects 0.000 claims description 16
- 238000005520 cutting process Methods 0.000 claims description 15
- 230000032683 aging Effects 0.000 claims description 13
- 229910052726 zirconium Inorganic materials 0.000 abstract description 6
- 229910052802 copper Inorganic materials 0.000 abstract description 4
- 229910019752 Mg2Si Inorganic materials 0.000 abstract 3
- 229910052742 iron Inorganic materials 0.000 abstract 1
- 229910052725 zinc Inorganic materials 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 24
- 238000005266 casting Methods 0.000 description 19
- 239000013078 crystal Substances 0.000 description 19
- 230000000694 effects Effects 0.000 description 17
- 238000003483 aging Methods 0.000 description 14
- 239000010949 copper Substances 0.000 description 14
- 229910045601 alloy Inorganic materials 0.000 description 13
- 239000000956 alloy Substances 0.000 description 13
- 238000010438 heat treatment Methods 0.000 description 13
- 238000001816 cooling Methods 0.000 description 10
- 230000002950 deficient Effects 0.000 description 10
- 238000009749 continuous casting Methods 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 238000011156 evaluation Methods 0.000 description 8
- 239000002244 precipitate Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 238000005728 strengthening Methods 0.000 description 6
- 229910052712 strontium Inorganic materials 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 238000002425 crystallisation Methods 0.000 description 4
- 230000008025 crystallization Effects 0.000 description 4
- 230000003628 erosive effect Effects 0.000 description 4
- 238000005098 hot rolling Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000005482 strain hardening Methods 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 230000008030 elimination Effects 0.000 description 3
- 238000003379 elimination reaction Methods 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000003801 milling Methods 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
- 238000007669 thermal treatment Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 229910018131 Al-Mn Inorganic materials 0.000 description 1
- 229910018461 Al—Mn Inorganic materials 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000008207 working material Substances 0.000 description 1
Classifications
-
- 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
- C22F1/05—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 of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
-
- 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
-
- 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
-
- 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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B33/00—Features common to bolt and nut
-
- 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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B2003/001—Aluminium or its alloys
Abstract
This aluminum alloy wire for use in bolts contains, in mass %, Si:0.60-1.5%, Fe:0.02-0.40%, Cu:0.50-1.2%, Mn:0.50-1.1%, Mg:0.70-1.3%, Cr:0.01-0.30%, Zn:0.005-0.50%, Ti:0.01-0.20% and Zr:0.05-0.20%, the remainder being Al and unavoidable impurities. A part of the Si and Mg content is in the form of Mg2Si, and Mg2Si/(Mn+Cr), the ratio of the content of Mg2Si to the total content of Mn and Cr, is 1.0-2.1.
Description
Technical field
The present invention relates to a kind of bolt aluminum alloy line, bolt and manufacture method thereof.The invention particularly relates to a kind of bolt aluminum alloy line that in the bolt manufacturing, has excellent processing characteristics and the bolt with sufficient intensity can be provided.
Background technology
Known A6056 is a kind of material for the aluminium alloy bolt.In addition, also known patent document 1(Japanese Patent spy opens No.2011-1602) described in the aluminum alloy line rod.Aluminum alloy line rod described in the patent documentation 1 has such crystallite, and this crystallite has 6000 and is the rolling texture of composition and has predetermined average crystal grain diameter.Patent documentation 1 has also been described this aluminum alloy line rod and has been had excellent bolt formability, and can be by carrying out the tensile strength that suitable thermal treatment and processing obtain being scheduled to.
Reference listing
Patent documentation
Patent documentation 1: the Japanese Patent spy opens No.2011-1602
Summary of the invention
Technical problem
Yet the formability of A6056 is relatively poor.Therefore, the defective that produces in casting or the operation of rolling etc. can cause forming the crack in being processed into the bolt process, and perhaps small crack can cause grain boundary corrosion.And, even the bolt that is formed by A6056 can not provide enough intensity through the artificial age-hardening.
On the other hand, patent documentation 1 bolt of having described the formability that can improve A6056 and its formation of can serving as reasons provides the aluminum alloy line rod of intensity.Yet, need to develop and can guarantee formability and after forming bolt, still can provide more high-intensity aluminum alloy line.Such bolt aluminum alloy line is developed in special expectation, and when using this bolt under hot environment, it is less that intensity reduces degree, and still keep high strength.
Under said circumstances, finish the present invention, and the purpose of this invention is to provide a kind of bolt aluminum alloy line, and the method for making this aluminum alloy line, when this aluminum alloy line is formed bolt, had enough formabilities, and provide high strength for bolt.Another object of the present invention provides a kind of bolt that is formed with aluminum alloy line by bolt of the present invention, and a kind of method of making this bolt.
The means of dealing with problems
For further improving formability and the intensity based on 6000 line aluminium alloys, the present inventor has carried out deep research and discovery, and the part in the Si that comprises and Mg is Mg
2During the form of Si, can regulate Mg effectively
2Ratio Mg between the total content of the content of Si and Mn and Cr
2Si/ (Mn+Cr) has finished the present invention thus so that it falls into predetermined scope.
Bolt according to the present invention contains the Ti of Zn, 0.01 quality %-0.20 quality % of Cr, 0.005 quality %-0.50 quality % of Mg, 0.01 quality %-0.30 quality % of Mn, 0.70 quality %-1.3 quality % of Cu, 0.50 quality %-1.1 quality % of Fe, 0.50 quality %-1.2 quality % of Si, 0.02 quality %-0.40 quality % of 0.60 quality %-1.5 quality % and the Zr of 0.05 quality %-0.20 quality % with aluminum alloy line, surplus is Al and subsidiary impurity.The Si that comprises and the part among the Mg are Mg
2The form of Si.Mg
2Ratio Mg between the total content of the content of Si and Mn and Cr
2Si/ (Mn+Cr) is 1.0 to 2.1.This composition can be called first forms.
The content that depends on Si and Mg, the intensity of resulting bolt is different.In aluminium alloy, by solution annealing and ageing treatment, make Si and Mg at least in part with Mg
2The form of Si is separated out, to improve the intensity of bolt.When the alloy wire that will have above-mentioned composition formed bolt, it had excellent formability, and can provide the bolt with sufficient intensity after being shaped.Particularly, by correlative value Mg
2Si/ (Mn+Cr) limits, and can access to have excellent stable on heating bolt simultaneously.It should be noted that at cast material stage, Mg
2The ratio of Si/ (Mn+Cr) is 1.0 to 2.1, and after pass through cast material is rolled and obtain the wire drawing material with wire drawing and formed by this wire drawing material in each stage of bolt, this ratio still remains in the above-mentioned scope substantially.
What need proposition is, bolt according to the present invention contains with a kind of form of aluminum alloy line: the Si of 0.80 quality %-1.4 quality %, 0.05 the Fe of quality %-0.30 quality %, 0.50 the Cu of quality %-1.2 quality %, the Mn of 0.50 quality %-1.1 quality %, the Mg of 0.80 quality %-1.3 quality %, 0.05 the Cr of quality %-0.30 quality %, 0.05 the Zn of quality %-0.25 quality %, the Zr of the Ti of 0.01 quality %-0.10 quality % and 0.10 quality %-0.20 quality %.This composition can be called second forms.
Limit by forming first by the content of above-mentioned element, can access the bolt with more excellent mechanical property.Particularly, can access tensile strength more than or equal to 400MPa, 0.2% proof stress more than or equal to 360MPa and elongation more than or equal to 6% bolt.
What need to propose is, has second bolt of forming and comprises with a kind of form of aluminum alloy line according to of the present invention: the Cu of 0.80 quality %-1.2 quality %, the Cr of the Mn of 0.70 quality %-1.1 quality % and 0.05 quality %-0.30 quality %.This composition can be called the 3rd composition.
By the content that utilizes above-mentioned element second composition is further limited, can access the bolt with more excellent mechanical property.Particularly, can access tensile strength more than or equal to 430MPa, 0.2% proof stress more than or equal to 370MPa and elongation more than or equal to 6% bolt.
What need proposition is that the bolt with first to the 3rd composition according to the present invention further contains the Sr of 0.005 quality %-0.05 quality % with a kind of form of aluminum alloy line.
Form according to this, by comprising the Sr of predetermined amount, can prevent from casting or the operation of rolling in the generation of defective, and can reduce the appearance in crack in the forming process etc.
What need to propose is, comprise the Sr of 0.005 quality %-0.03 quality % according to the bolt of the Sr of containing of the present invention with a kind of form of aluminum alloy line, and the ratio Zr/Sr between the content of the content of Zr and Sr is 3 to 50.
Content by Sr in forming first limits, and Zr and Sr by comprising predetermined ratio, then can guarantee enough formabilities in the stable on heating while of vital line.Although Zr is required element for the thermotolerance that improves aluminum alloy line,, casting temp uprises when containing Zr, and this is difficult to carry out grain refining with regard to making.On the other hand, when the Sr that comprises is predetermined ratio with respect to the ratio of Zr, then can suppress the alligatoring of crystal grain effectively.When containing Sr, although the intensity of aluminum alloy line has improved, aluminum alloy line becomes fragile possibly.When containing Sr under the situation of the Zr that has predetermined amount, embrittlement is suppressed and can be guaranteed formability.
A kind of method of using aluminum alloy line according to bolt according to the present invention of making comprises the steps:
Casting step: obtain cast material, described cast material contains the Si of 0.60 quality %-1.5 quality %, 0.02 the Fe of quality %-0.40 quality %, 0.50 the Cu of quality %-1.2 quality %, 0.50 the Mn of quality %-1.1 quality %, 0.70 the Mg of quality %-1.3 quality %, 0.01 the Cr of quality %-0.30 quality %, 0.005 the Zn of quality %-0.50 quality %, 0.01 the Ti of quality %-0.20 quality %, with the Zr of 0.05 quality %-0.20 quality %, surplus is Al and subsidiary impurity, and the described Si and the part among the Mg that wherein comprise are Mg
2The form of Si, and Mg
2Ratio Mg between the total content of the content of Si and Mn and Cr
2Si/ (Mn+Cr) is 1.0 to 2.1.
Rolling step: above-mentioned cast material is rolled and obtains rolling stock.
Drawing step: the rolling material is carried out wire drawing and obtains preset lines wire drawing line rod directly.
Intermediate softening step: under 250 ℃ to 500 ℃, the line rod in the above-mentioned drawing step carried out 0.5 hour to 40 hours softening processing.
According to this method, can access and be applicable to the aluminum alloy line of making bolt.Particularly, can access as the raw-material aluminum alloy line of bolt with excellent productivity and mechanical property.
Bolt according to the present invention is the bolt that is formed by aluminium alloy.Described aluminium alloy contains the Si of 0.60 quality %-1.5 quality %, 0.02 the Fe of quality %-0.40 quality %, 0.50 the Cu of quality %-1.2 quality %, 0.50 the Mn of quality %-1.1 quality %, the Mg of 0.70 quality %-1.3 quality %, the Cr of 0.01 quality %-0.30 quality %, 0.005 the Zn of quality %-0.50 quality %, 0.01 the Zr of the Ti of quality %-0.20 quality % and 0.05 quality %-0.20 quality %, surplus is Al and subsidiary impurity.The Si that this alloy comprises and the part among the Mg are Mg
2The form of Si, and Mg
2Ratio Mg between the total content of the content of Si and Mn and Cr
2Si/ (Mn+Cr) is 1.0 to 2.1.This bolt has the tensile strength more than or equal to 380MPa, more than or equal to 0.2% proof stress of 350MPa, and more than or equal to 6% elongation.
Have the starting material of above-mentioned composition by use, can access the excellent bolt of mechanical property (as tensile strength, 0.2% proof stress etc.).
A kind of method of making according to bolt of the present invention comprises the steps:
Cutting step: bolt according to the present invention is cut into predetermined length with aluminum alloy line.
Cold pressure made step: the bolt after the cutting is carried out the head that cutting machine processes to form bolt with aluminum alloy line.
Form rolling step: the bolt after the cutting is formed rolling to form the threaded portion of bolt with aluminum alloy line.
Heat treatment step: the target object in the process of being made bolt by bolt with aluminum alloy line is carried out solution annealing and ageing treatment.
According to this method, in the bolt forming process, be not prone to crack etc., and can make bolt with enough productivitys.The bolt of gained is being excellent aspect the physical strengths such as tensile strength.In addition, according to the composition of aluminum alloy line of the present invention, can access the bolt that also has excellent heat resistance simultaneously.
Beneficial effect of the present invention
In the bolt forming process, have excellent processing characteristics according to aluminum alloy line of the present invention and by first aluminum alloy line of forming that has that aluminum alloy line manufacture method of the present invention obtains, and the bolt with excellent mechanical property can be provided.Therefore, bolt according to the present invention has excellent mechanical property, and aluminum alloy line manufacture method of the present invention can provide the bolt with very good mechanical properties.
Embodiment
Below will describe embodiments of the present invention.It should be noted that in following explanation, the composition of aluminum alloy line is represented with quality %.
[aluminum alloy line]
A kind of bolt according to the present invention contains the Si of 0.60 quality %-1.5 quality % with aluminum alloy line, 0.02 the Fe of quality %-0.40 quality %, 0.50 the Cu of quality %-1.2 quality %, 0.50 the Mn of quality %-1.1 quality %, 0.70 the Mg of quality %-1.3 quality %, the Cr of 0.01 quality %-0.30 quality %, the Zn of 0.005 quality %-0.50 quality %, 0.01 the Zr of the Ti of quality %-0.20 quality % and 0.05 quality %-0.20 quality %, surplus is Al and subsidiary impurity.With in the aluminum alloy line, the Si that comprises and the part among the Mg are Mg at bolt according to the present invention
2The form of Si, and Mg
2Ratio Mg between the total content of the content of Si and Mn and Cr
2Si/ (Mn+Cr) is 1.0 to 2.1(first compositions).Therefore, can access the aluminum alloy line that in the bolt forming process, has excellent processing characteristics, thereby the bolt with excellent mechanical property can be provided.
Preferably, bolt according to the present invention contains the Si of 0.80 quality %-1.4 quality % with aluminum alloy line, 0.05 the Fe of quality %-0.30 quality %, 0.50 the Cu of quality %-1.2 quality %, the Mn of 0.50 quality %-1.1 quality %, the Mg of 0.80 quality %-1.3 quality %, 0.05 the Cr of quality %-0.30 quality %, 0.05 the Zn of quality %-0.25 quality %, the Zr(second of the Ti of 0.01 quality %-0.10 quality % and 0.10 quality %-0.20 quality % forms).Therefore, can provide and have more excellent physical strength and the bolt of good heat resistance.
Preferably, in second formed, the content of Cu was 0.80 quality %-1.2 quality %, and the content of Mn is 0.70 quality %-1.1 quality %, and the content of Cr is 0.05 quality %-0.30 quality %(the 3rd composition).Therefore, can provide and have more excellent physical strength and the bolt of good heat resistance.
Preferably, bolt according to the present invention contains the Sr of 0.005 quality %-0.05 quality % with aluminum alloy line.Therefore, can provide the bolt with more excellent physical strength, and can not cause the embrittlement of aluminum alloy line.More preferably, bolt according to the present invention contains the Sr of 0.005 quality %-0.03 quality % with aluminum alloy line, and the ratio Zr/Sr between the content of the content of Zr and Sr is 3 to 50.Be set at 3 to 50 by the ratio with Zr/Sr, can prevent effectively because containing that Zr takes place to melt and because containing the aluminum alloy line embrittlement that Sr causes again.
[composition]
（Si：0.60%-1.5%）
Si partly is dissolved in the alloy matrix aluminum together with Mg, to obtain the solution strengthening of aluminum alloy line.The Si element is to form timeliness precipitate etc. to improve intensity and to provide bolt the required necessary element of predetermined mechanical property in the artificial aging process of aluminum alloy line.Be 0.60% by the lower limit set with Si content, can suitably bring into play the effect of solution strengthening and age hardening.Therefore, can access the bolt of predetermined strength.Be set at 1.5% by the upper limit with Si content, can not destroy by cast material to the processing characteristics of wire rod and the formability that forms bolt, and can prevent from forming the coarse crystallization material or the precipitate that become the source, crack, this helps to make bolt to have higher intensity.Preferred Si content is 0.80%-1.4%.In this scope, be easy to obtain having the bolt of more excellent physical strength.
（Fe：0.02%-0.40%）
Need Fe to be lifted at the effect of the grain-refining agent (comprising Ti) in the castingprocesses under alkali earth metal (as Mg and the Sr) existence.Be 0.02% can help the refinement of crystal grain in the alloy effectively with the lower limit set of Fe content.On the other hand, the upper limit is set at 0.40% and can prevents that crystal boundary place in alloy structure from producing that Fe binds brilliant material and the plastic deformation ability deterioration that makes alloy.Preferred Fe content is 0.05%-0.30%.The content that is more preferably is 0.05%-0.25%.In these scopes, be easy to obtain having the bolt of more excellent physical strength.
（Cu：0.50%-1.2%）
Cu and Mg and Si help to improve intensity jointly.Be 0.50% by the lower limit set with Cu content, be easy to obtain this effect.On the other hand, by its upper limit is set at 1.2%, be easy to guarantee the formability of bolt.Preferred Cu content is 0.80%-1.2%.In this scope, be easy to obtain having more excellent physical strength and the bolt of good heat resistance.
（Mn：0.50%-1.1%）
Mn partly is dissolved in the alloy matrix aluminum to realize the solution strengthening of aluminum alloy line.It is discrete particles that Mn can form Al-Mn, and the crystal grain of this line bar structure of refinement also improves intensity, formability, erosion resistance etc.Be 0.50% by the lower limit set with Mn content, reached the solution strengthening of aluminum alloy line, therefore be easy to obtain sufficiently high intensity for bolt.By the upper limit is set at 1.1%, can prevent from becoming the coarse crystallization material in source, crack or the formation of precipitate, this helps bolt to reach higher intensity.The content of preferred Mn is 0.70%-1.1%.In this scope, be easy to obtain having more excellent physical strength and the bolt of good heat resistance.
（Mg：0.70%-1.3%）
Mg realizes the solution strengthening of aluminum alloy line and together is formed with Si in the artificial aging process helping improve the timeliness precipitate of intensity to satisfy the necessary element of the required mechanical property of bolt.Be 0.70% by the lower limit set with Mg content, can bring into play sufficient solution strengthening function and age hardening function.By the upper limit is set at 1.3%, can prevent from becoming the coarse crystallization material in source, crack or the formation of precipitate, this helps bolt to reach higher intensity.The content of preferred Mg is 0.80%-1.3%.In this scope, be easy to obtain having more excellent physical strength and the bolt of good heat resistance.
（Cr：0.01%-0.30%）
Be similar to Mn and Zr, Cr can form discrete particles, and therefore in the process of aluminum alloy line being heat-treated with crystal grain thinning, it has the effect of the grain coarsening of preventing.The refinement of crystal grain helps to improve formation property of bolt strength and bolt.Cr improves the effect of erosion resistance in addition.Be 0.01% by the lower limit set with Cr content, can suitably obtain these effects.By the upper limit is set at 0.30%, has prevented the alligatoring of crystal grain, and can suitably bring into play the effect of crystal grain thinning.Preferred content range is 0.05%-0.30%.The Cr that contains more than or equal to 0.05% can obtain not only have excellent intensity, also have excellent stable on heating bolt.
（Zn：0.005%-0.50%）
Zn have aluminum substrate mutually in dissolving and improve the function of alloy strength.Be 0.005% by the lower limit set with Zn content, can suitably bring into play the effect that improves intensity.By the upper limit is set at 0.50%, can guarantee suitable erosion resistance.Preferred Zn content is 0.05%-0.25%.In this scope, guarantee to obtain the required toughness of bolt shaping easily, and the bolt that is easy to obtain having more excellent physical strength and excellent machinability, thermotolerance and erosion resistance.
（Ti：0.01%-0.20%）
Ti has the crystalline structure of refinement cast material and reduces the ratio of columnar grain in the cast material with the effect of the ratio of increase equi-axed crystal.Therefore, contain rolling processing characteristics and Wire Drawing performance that Ti can improve cast material, and then improve the formability that forms bolt.In addition, because the refinement of crystalline structure is not easy to produce defective in plastic processing.Therefore, can access the plastic working material with the excellent condition of surface that does not almost have defective.Be 0.01% by the lower limit set with Ti content, be easy to obtain the effect of crystal grain thinning.Although Ti content is more high, the effect of the defective that the refinement of crystal grain is relevant with refinement with minimizing is more good, is about 0.20% o'clock at content, as if this effect reaches capacity, and also can prevent the generation of thick intermediate compound under this content.Therefore, the upper limit of Ti content is set at 0.20%.Preferred Ti content is 0.01%-0.10%.In this scope, be easy to obtain having the more bolt of excellent mechanical strength.Ti can be mixed in TiB
2In molten metal, thereby and B also have the effect that the refinement crystalline structure that is similar to Ti improves intensity.Therefore, allow to contain approximately be less than or equal to the 50ppm(mass ratio) B.
（Zr：0.05%-0.20%）
Similar with Mn, thus Zr also has the effect that formation contains the discrete particles of each element and prevent from taking place the grain coarsening crystal grain thinning in the aluminum alloy line heat treatment process.Therefore, the formability that helps to improve the intensity of bolt and form bolt.Zr also is the stable on heating necessary element that improves aluminum alloy line.Be 0.05% by the lower limit set with Zr content, the intensity that can suitably be improved and form the effect of the formability of bolt.By the upper limit is set at 0.20%, can effectively prevent the alligatoring of crystal grain.Preferred Zr content is 0.10%-0.20%.In this scope, be easy to obtain having more excellent physical strength and the bolt of good heat resistance.
(Mg
2Si/ (Mn+Cr): 1.0 to 2.1)
Si and Mg partly are dissolved in the alloy matrix aluminum to help to improve intensity, and surplus is Mg
2The form of Si.On the other hand, Cr and Mn all have the formation discrete particles is conducive to improve intensity with preventing the structure alligatoring function.By to Mg
2Ratio between the total content of the content of Si and Cr and Mn limits, and can access to have high mechanical strength and stable on heating bolt.Though its reason is still uncertain, it is believed that Mg
2Si and Mn and Cr interact, when keeping high temperature, preventing the strength degradation that produces because of timeliness, and by adding and Mg
2Thereby the Mn that the amount of Si is corresponding and Cr have improved its thermotolerance.This ratio is set at 1.0 to 2.1.Preferred ratio is about 1.4 to 2.0.Particularly preferred ratio is about 1.5 to 1.8.Carrying out it is believed that Mn and Cr have prevented dislocation moving under the situation of aluminium alloy processing after the artificial aging, and preventing from by work hardening the intensity of the part that intensity is improved being descended.The value of being calculated by the amount of the Mg that adds and Si is as Mg
2The content of Si.Particularly, obtain Mg by expression 1
2The content of Si.This calculated value is represented, by carrying out solution annealing and ageing treatment to separate out Mg
2Si and Mg in the material that obtains
2Si content.The total content of Cr and Mn is preferably about 0.55%-1.5%, about 0.70%-1.4% more preferably, and be preferably about 0.75%-1.3% especially.
{ content of Mg [quality %]/(nucleidic mass of Mg * 2) } * (Mg
2The molecular weight of Si)
Expression formula 1
（Sr：0.005%-0.05%）
Although Sr is not indispensable element, also can contain Sr with as additional interpolation element.Sr also has the function of the crystalline structure of refinement cast material, and helps to improve the intensity of gained bolt.Particularly, if in the presence of Zr, contain Sr, then can improve the intensity of aluminum alloy line and can not make its embrittlement.Be 0.005% by the lower limit set with Sr content, be easy to reach the effect that improves bolt strength.By the upper limit is set at 0.05%, then can effectively prevents the embrittlement of aluminum alloy line, and can obtain enough intensity.The content of preferred Sr is 0.005%-0.03%.In this scope, be easy to obtain having more excellent physical strength and the bolt of good heat resistance.
(Zr/Sr:3 to 50)
As mentioned above, Zr improves the required element of thermotolerance, if but containing Zr, the fusing point of alloy will raise, and cause higher casting temp and be difficult to solidifying.Comparatively speaking, then do not have problems for billet continuous casting.Yet, under the situation of continuous casting, if in the solidification process of molten metal, shrink, be easy to occur the phenomenon of the outside surface distortion of cast material.This crushed element makes cast material no longer contact with mould, and therefore cooling becomes slow.Because the heat of cast material inside is understood again the phenomenon that occurrence temperature raises and surpasses fusing point and cause melting again, the result causes the alligatoring of crystal grain and the deterioration of cast material surface quality.The result is that the part of the part of grain coarsening and surface quality deterioration becomes the source of defective in the casting rolling and drawing process afterwards easily.On the other hand, Sr has the function that improves intensity of aluminum alloy, but causes embrittlement easily.By the ratio between Zr and the Sr is limited in the predetermined scope, just can effectively prevent molten and owing to the generation that contains the embrittlement that Sr causes again owing to what contain that Zr causes.Can think, be 3 by the lower limit set with this ratio, just contained the Zn with respect to the Sr appropriate amount, just can effectively prevent embrittlement and help to improve intensity.Can think, be set at 50 by the upper limit with this ratio, just contain the Sr with respect to the Zn appropriate amount, just elimination and the defective of melt-phase pass easily again.The preferred scope of this ratio is about 5 to 20.In this scope, obtain to have more excellent physical strength and the bolt of good heat resistance easily.Restriction to this ratio is not necessary among the present invention.
[line footpath]
Aluminum alloy line according to the present invention has no particular limits, and for example can select the line footpath of about 12mm to 3mm.When this aluminum alloy line has such line footpath, can manufacturing dimension be suitable for the bolt of fastening auto parts etc.
[manufacture method of aluminum alloy line]
Usually make aluminum alloy line by casting, rolling, line wire drawing and intermediate softening.To the details of each step be described below.
[casting]
Casting has the cast material of above-mentioned composition.Continuous casting process is suitable for casting.In aluminum alloy line manufacture method of the present invention, be set to have predetermined composition by aluminium alloy, can be had the cast material that possesses excellent surface quality of defective equally by continuous casting hardly.Use such cast material can reduce the generation in crack and defective in the rolling and drawing process, therefore can access rolling stock and the wire drawing material with excellent surface property.Particularly, in the manufacture method of aluminum alloy line of the present invention, can access the wire drawing material with excellent surface property, and need not as generally, increase the peeling number in the drawing process, increase the susceptibility of peeling amount or raising gamma defectoscope.Therefore, according to the manufacture method of aluminum alloy line of the present invention, can have the aluminum alloy line of good yield and excellent condition of surface with good productivity manufacturing.As Continuous casting process, preferred belt wheel technology (ベ Le ト ア Application De ホ イ ー Le mode).
Cooling in the castingprocesses is preferably carried out under more than or equal to 5 ℃/second speed, more preferably more than or equal to 8 ℃/second, and again more preferably more than or equal to 20 ℃/second.By rate of cooling being set at more than or equal to 5 ℃/second, can prevent the alligatoring of crystal grain, thereby obtain having the cast material of fine structure or the higher cast material of ratio of the equi-axed crystal in the unit cross-sectional area.Preferably, the rate of cooling of optional position that is to say more than or equal to 5 ℃/second in the molten metal in process of cooling, and whole molten metal can cool off equably.For example, the continuous casting machine that has a copper mould, Forced water cooling mechanism etc. of water-cooled by use just can obtain fast setting under above-mentioned rate of cooling.
[rolling]
Cast material is rolled processing to obtain rolling stock.Preferably, this is rolling for hot rolling or warm-rolling.Equally preferably rolling and casting is carried out together continuously.When carrying out continuously, utilize the heat that stores in the cast material to be easy to carry out hot rolling, thereby obtain high energy efficiency with casting when rolling.In addition, the productivity of casting rolling material is also than the productivity height of casting in batches.For example, use such casting machine, wherein, with belt and wheel combination, and milling train is connected on this casting machine.The example of such machine comprises Properzi continuous casting milling train.
[wire drawing]
Rolling stock is carried out wire drawing, it is processed as the wire drawing line rod with preset lines footpath.The line wire drawing is preferably undertaken by cold drawn.According to the surface appearance of rolling stock before the wire drawing, can remove the peel processing.
[intermediate softening]
Line rod in the above-mentioned drawing process is softened processing.This intermediate softening is handled and is carried out under this condition, and namely the line rod after this processing will have the elongation more than or equal to 10%.Carrying out this intermediate softening processing is the intensity (intensity of this wire rod is improved by refinement crystalline structure and work hardening) that does not extremely reduce the line rod for softening this line rod, increases the toughness of this line rod thus.
Can suitably handle process for softening in batches.Atmosphere in softening the processing produces oxide film in order to prevent the heat in the treating processes on the surface of wire rod, is preferably non-oxidizing atmosphere.The example comprises: vacuum atmosphere (reduced atmosphere); Inert gas atmosphere is as nitrogen (N
2) or argon gas (Ar); Reducing gas atmosphere, as contain hydrogen gas (as, hydrogen (H is only arranged
2), or N
2, Ar or helium rare gas element and hydrogen (H such as (He)
2) mixed gas) or contain carbon dioxide gas (as, carbon monoxide (CO) and carbonic acid gas (CO
2) mixed gas).
By soften processing under more than or equal to 250 ℃ Heating temperature, the line rod can have the elongation more than or equal to 10%.Under the situation of processing in batches, preferred condition comprises: Heating temperature is more than or equal to 250 ℃ and be less than or equal to 500 ℃, and the hold-time more than or equal to 0.5 hour, more preferably more than or equal to 1 hour.If Heating temperature was lower than 250 ℃ and hold-time less than 0.5 hour, then softening processing will almost not have effect.If Heating temperature is higher than 500 ℃, then crystal grain and crystallization precipitate will alligatoring, and reduce its processing characteristics easily.Special what wish is to be set at Heating temperature more than or equal to 300 ℃ and to be less than or equal to 450 ℃, and the hold-time is for more than or equal to 2 hours and be less than or equal to 40 hours.Again more preferably, Heating temperature is 380 ℃ to 420 ℃, and the hold-time for being less than or equal to 24 hours, particularly be less than or equal to 15 hours.
[other]
After final wire drawing, also can soften processing (final softening the processing).Final softening processing also can suitably be carried out more than or equal to 1 hour under more than or equal to 300 ℃.Final softening processing can improve the formability in the bolt processing.
[bolt]
[composition]
The composition of bolt and the composition of above-mentioned aluminum alloy line are similar.
[mechanical property]
When aluminum alloy line had first composition, bolt can access such performance after being shaped: tensile strength was more than or equal to 380MPa, and 0.2% proof stress is more than or equal to 350MPa, and elongation is more than or equal to 6%.When aluminum alloy line had second composition, bolt can access such performance after being shaped: tensile strength was more than or equal to 400MPa, and 0.2% proof stress is more than or equal to 360MPa, and elongation is more than or equal to 6%.When aluminum alloy line had the 3rd composition, bolt can access such performance after being shaped: tensile strength was more than or equal to 430MPa, and 0.2% proof stress is more than or equal to 370MPa, and elongation is more than or equal to 6%.If aluminum alloy line contains the Sr of 0.005 quality %-0.05 quality %, then can access the bolt with excellent mechanical strength, and can not cause the embrittlement of aluminum alloy line.If aluminum alloy line contains the Sr of 0.005 quality %-0.03 quality %, if and the ratio Zr/Sr between the content of the content of Zr and Sr is 3 to 50, then can access and have the more bolt of excellent mechanical strength, and can not cause owing to containing molten again that Zr takes place, and owing to the embrittlement that contains the aluminum alloy line that Sr takes place.
After the final wire drawing aluminum alloy line carried out bolt processing and add at bolt carrying out solution annealing and ageing treatment man-hour, can obtain all these performances thus.Can adopt tension test, measure any performance according to JISB1051, wherein, the product bolt is used as test block.
[manufacture method of bolt]
Usually by above-mentioned aluminum alloy line is cut, cold pressure makes processing, form rolling and solution annealing and ageing treatment is carried out the manufacturing of bolt.Can obtain to have the bolt of the performance described in above-mentioned [mechanical property] part thus.Below will the details of each step be described.
[cutting]
When cutting, above-mentioned aluminum alloy line is cut into the length that is applicable to bolt processing.Can suitably select the length of gained cutting member according to the size of the bolt that will make.
[cold pressure made processing]
Make cold pressure and to add man-hour, forging is carried out to form the head of bolt in the end of the cutting member that obtains in the cutting step.Can use known condition as processing conditions.
[form rolling]
When form rolling, in the cutting member that is obtained by cutting step, form threaded portion.Can use known condition as processing conditions.Usually carry out cold pressure make processing after form rolling.
[solution annealing+timeliness]
The target object that will be processed into bolt is carried out solution annealing and ageing treatment, in alloy, to form precipitate and to improve the intensity of this target object.The operation of carrying out this solution annealing and timeliness comprises following mode:
(1)-cold pressure of cutting made processing-solution annealing+timeliness-form rolling
(2) cutting-middle forging-solution annealing+timeliness-cold pressure is made processing-form rolling, perhaps
Cutting-solution annealing+timeliness-cold pressure is made processing-form rolling
That is to say, can carry out or not carry out the centre and forge.
(3)-cold pressure of cutting made processing-form rolling-solution annealing+timeliness
(4) cutting-solution annealing-cold pressure is made processing-form rolling-timeliness, and perhaps cutting-solution annealing-preageing-cold pressure is made processing-form rolling-timeliness and be that is to say, can carry out or not carry out preageing.
(5) solution annealing-wire drawing-cutting-cold pressure is made processing-timeliness-form rolling
(6) solution annealing-wire drawing-cutting-middle forging-timeliness-cold pressure is made processing-form rolling
(7) solution annealing-wire drawing-cutting-cold pressure is made processing-form rolling-timeliness.
In aforesaid way, for mode (1), (2), (5) and (6), by in final step, forming rolling, make threaded portion have high dimensional precision.In addition, by form rolling the part that will become threaded portion is carried out plastic working, make starting material be able to work hardening, therefore can improve the intensity of bolt a little.
For mode (2) and (6), by after timeliness, carrying out plastic working, make starting material processedly to harden, so intensity also can further improve.
For mode (3), (4) and (7), plastic working was carried out before timeliness.Therefore, can make screw by the material that processing characteristics is relatively low.For mode (7), wherein plastic working is to carry out under the situation that does not almost have precipitate, can make screw with hanging down the lower material of processing characteristics.
For mode (4), (5), (6) and (7), plastic working is carried out after solution annealing, therefore the refinement of crystal grain can take place and cause strain.Therefore, compare with the situation of carrying out solution annealing after the plastic working, the intensity of bolt can be improved.
For any one mode, suitably under 520 ℃ to 560 ℃, carry out solution annealing 1 hour to 5 hours, and suitably under 160 ℃ to 180 ℃, carried out ageing treatment 4 hours to 30 hours.By this solution annealing and ageing treatment, can also be by control Mg
2The precipitation state of Si and adjust the mechanical property of bolt.It should be noted that under the situation of carrying out the preageing processing, suitably under 50 ℃ to 160 ℃, heat-treated about 4 hours to 50 hours.
[embodiment]
＜test example 1 〉
Step according to casting-rolling-line wire drawing-intermediate softening-line wire drawing is made aluminum alloy line.In manufacturing processed, the surface quality of cast material and wire drawing material is estimated.In addition, the aluminum alloy line of gained is processed into bolt, and the crack in the forming process and thermotolerance are estimated.Also estimated the mechanical property of bolt.The composition of each sample is as shown in table 1, and main evaluation result is as shown in table 2.In table 1 and 2, comparative example 1 is the material that is equivalent to A6056.
The manufacturing of＜＜alloy wire〉〉
At first, will dissolve as the fine aluminium of base material, and put in its molten metal to make it having predetermined concentration adding element.The al alloy molten metal that the component process is adjusted carries out suitable hydrogen elimination processing and foreign matter elimination processing.By belt wheel formula continuous casting milling train the molten metal of this aluminum alloy line is cast and hot rolling, to make the wire rod of φ 9.5mm.Rate of cooling in the castingprocesses is set at more than or equal to 5 ℃/second.Use the water-cooled copper mould so that in the process of cooling in the molten metal rate of cooling of optional position all more than or equal to 5 ℃/second.By preparation Al-3%Ti-1%B(quality %) wire rod and cast in the mode that molten metal and wire rod are fed in the mould simultaneously, thus add Ti and the B that is used for structure refinement.Then, this line rod is cold drawn to φ 8.3mm, and the intermediate softening that carried out 5 hours in the mode of processing is in batches handled under 400 ℃.This softener material further is stretched to φ 7.05mm.The alloy wire of gained is handled with final the softening that the mode of processing was in batches carried out 5 hours under 350 ℃, thereby obtained described aluminum alloy line.It should be noted that because the addition of the Si that comprises in each sample has surpassed stoichiometric composition, so Mg in the table 1
2The content of Si is calculated by following formula
{ content of Mg [quality %]/(nucleidic mass of Mg * 2) } * (Mg
2The molecular weight of Si)
Expression formula 1
The evaluation of the molten part of＜＜again〉〉
The cast material of gained is suitably taken a sample, and outward appearance is observed with to estimating owing to the molten number of molten part again that causes again in the solidification process.Thereby contain the sample of Sr and do not contain between the sample of Sr again the number of molten part by contrast molten part is again made evaluation.
The evaluation of＜＜flaw detection number〉〉
To be stretched to 11.7mm by the rolling resulting rolling stock of continuous casting, and in this stage, use the peeling mould that it is carried out thickness and be the peeling of 0.2mm.It should be noted that and not remove the peel.By peeling, can remove the relative smaller defect by other factors (as hot rolling and the wire drawing subsequently) generation outside molten again.By following manner the flaw detection number is estimated: at first use the online eddy current flaw detec that provides as drawing wire machine to observe the defective number of the above-mentioned material surface that will remove the peel, and place sign in the flaw detection counting position, relatively contain the sample of Sr then and do not contain flaw detection number between the sample of Sr.
The manufacturing of＜＜bolt〉〉
Make bolt by resulting aluminum alloy line.In the present embodiment, the T6 that makes for the M8 bolt handles material, and carries out the T9 processing material that cold working (the middle forging) obtains by T6 being handled material.The manufacture method of each bolt is as follows.For each bolt, under 550 ℃, carry out solution annealing 2 hours, and under 175 ℃, carried out ageing treatment 8 hours.Notice, owing in the course of processing of T9 processing material, the crack occurred, therefore comparative example 4 and 5 is not carried out thermotolerance test described later and mechanical property evaluation.
T6 handles material
Cut-cold pressure and make processing-solution annealing-ageing treatment-form rolling
T9 handles material
Cutting-middle forging-solution annealing-ageing treatment-cold pressure is made processing-form rolling
T8 handles material
Cutting-solution annealing-cold pressure is made processing-form rolling-timeliness
The evaluation in crack in the＜＜bolt〉〉
Incidence to crack in resulting 500 bolts is estimated.Make crack the existing with definite crack that produces in the processes such as processing, form rolling by visual observation cold pressure.Compare to make evaluation by the incidence to crack between the sample that contains Sr and the sample that do not contain Sr.
The test of＜＜thermotolerance〉〉
The bolt that makes was kept 1000 hours down at 150 ℃, at room temperature carry out tension test then, come thermotolerance is estimated by the rate of descent of the tensile strength after the thermal treatment with respect to tensile strength before the thermal treatment.As reference, the sample deciding grade and level that rate of descent is lower is C with comparative example 1, and the sample deciding grade and level that will have same rate of descent is B, and the sample deciding grade and level that rate of descent is improved more than 20% is A.The rate of descent raising refers to more than 20% that the rate of descent of for example supposing comparative example 1 is 10%, and then the rate of descent of sample will be less than or equal to 8%.
The evaluation of＜＜mechanical property〉〉
At room temperature, use bolt to carry out tension test as sample, so that tensile strength, 0.2% proof stress and elongation are estimated.This tension test is carried out according to JIS B1051.Should be noted in the discussion above that for above-mentioned T9 and handle material, in table 2, only listed its tensile strength and 0.2% proof stress.
[table 2]
Owing in the course of processing of T9 processing material, the crack occurred, therefore comparative example 4 and 5 do not estimated.
＜＜inquire into〉〉
Shown in table 1 and 2, (Mg wherein among the embodiment 1 to 10
2Si/ (Mn+Cr) is 1.0 to 2.1) T6 handle material tensile strength more than or equal to 380MPa(particularly, more than or equal to 420MPa), 0.2% proof stress more than or equal to 350MPa(particularly, more than or equal to 370MPa), elongation is more than or equal to 6%, and has good thermotolerance.T9 among the embodiment 1 to 10 handles material and has higher physical strength, for example, tensile strength more than or equal to 460MPa(particularly, more than or equal to 490MPa), 0.2% proof stress more than or equal to 440MPa(particularly, more than or equal to 480MPa).Can see, compare with 8 with having first embodiment 1 that forms that tensile strength and 0.2% proof stress with T9 processing material of second embodiment 10 that forms are improved.Particularly, have tensile strength that the T6 of the 3rd embodiment 2 to 7 that forms and embodiment 9 handles material more than or equal to 430MPa, 0.2% proof stress is more than or equal to 370MPa, and elongation is more than or equal to 6% and have an excellent thermotolerance.The T9 of embodiment 2 to 7 and embodiment 9 handles the tensile strength of material more than or equal to 510MPa, and 0.2% proof stress is more than or equal to 500MPa, and has high heat resistance.The tensile strength that the T8 of embodiment 7 handles material is that 502MPa and 0.2% proof stress are 482MPa, and has high heat resistance.Compare with embodiment 10 with the embodiment 1 to 6 that does not contain Sr, in the embodiment 7 to 9 that contains more than or equal to 0.005% Sr, the number in molten, flaw detection number and crack has all reduced again.On the other hand, for Mg
2Si/ (Mn+Cr) is not within 1.0 to 2.1 scope or do not satisfy first comparative example of forming 1 to 5, and its thermotolerance and processing characteristics (crack) aspect is all good inadequately.Particularly, without any the thermotolerance raising amount of comparative example more than or equal to 20%.
Be noted that the present invention is not limited to above-mentioned embodiment, and can in the scope that does not break away from the present invention's essence main points, be suitably improved.
Industrial applicibility
Manufacture method according to aluminum alloy line of the present invention and this aluminum alloy line is applicable to that bolt is with plain line or for the manufacturing of bolt with plain line.Manufacture method according to bolt of the present invention and this bolt can suit to be used as in order to the bolt of fastening trolley part or for the manufacture of this bolt.
Claims (8)
1. bolt aluminum alloy line, contain:
0.60 the Si of quality %-1.5 quality %;
0.02 the Fe of quality %-0.40 quality %;
0.50 the Cu of quality %-1.2 quality %;
0.50 the Mn of quality %-1.1 quality %;
0.70 the Mg of quality %-1.3 quality %;
0.01 the Cr of quality %-0.30 quality %;
0.005 the Zn of quality %-0.50 quality %;
0.01 the Ti of quality %-0.20 quality %; With
0.05 the Zr of quality %-0.20 quality %,
Surplus is Al and subsidiary impurity,
The described Si and the part among the Mg that comprise are Mg
2The form of Si, and
Mg
2Ratio Mg between the total content of the content of Si and Mn and Cr
2Si/ (Mn+Cr) is 1.0 to 2.1.
2. bolt aluminum alloy line according to claim 1, contain:
0.80 the Si of quality %-1.4 quality %;
0.05 the Fe of quality %-0.30 quality %;
0.50 the Cu of quality %-1.2 quality %;
0.50 the Mn of quality %-1.1 quality %;
0.80 the Mg of quality %-1.3 quality %;
0.05 the Cr of quality %-0.30 quality %;
0.05 the Zn of quality %-0.25 quality %;
0.01 the Ti of quality %-0.10 quality %; With
0.10 the Zr of quality %-0.20 quality %.
3. bolt aluminum alloy line according to claim 2, contain:
0.80 the Cu of quality %-1.2 quality %;
0.70 the Mn of quality %-1.1 quality %; With
0.05 the Cr of quality %-0.30 quality %.
4. according to each described bolt aluminum alloy line in the claim 1 to 3, also contain the Sr of 0.005 quality %-0.05 quality %.
5. bolt aluminum alloy line according to claim 4 contains the Sr of 0.005 quality %-0.03 quality %, wherein,
Ratio Zr/Sr between the content of Zr and the content of Sr is 3 to 50.
6. make bolt with the method for aluminum alloy line for one kind, comprise the steps:
Obtain cast material, this cast material contains
0.60 the Si of quality %-1.5 quality %,
0.02 the Fe of quality %-0.40 quality %,
0.50 the Cu of quality %-1.2 quality %,
0.50 the Mn of quality %-1.1 quality %,
0.70 the Mg of quality %-1.3 quality %,
0.01 the Cr of quality %-0.30 quality %,
0.005 the Zn of quality %-0.50 quality %,
0.01 the Ti of quality %-0.20 quality % and
0.05 the Zr of quality %-0.20 quality %,
Surplus is Al and subsidiary impurity,
The described Si and the part among the Mg that comprise are Mg
2The form of Si, and Mg
2Ratio Mg between the total content of the content of Si and Mn and Cr
2Si/ (Mn+Cr) is 1.0 to 2.1;
By being rolled, described cast material obtains rolling stock;
Obtain having preset lines wire drawing line rod directly by described rolling stock being carried out wire drawing; And
In 250 ℃ under 500 ℃, the described line rod in the described line drawing step process is carried out 0.5 hour to 40 hours softening processing.
7. bolt that is formed by aluminium alloy,
Described aluminium alloy contains
0.60 the Si of quality %-1.5 quality %,
0.02 the Fe of quality %-0.40 quality %,
0.50 the Cu of quality %-1.2 quality %,
0.50 the Mn of quality %-1.1 quality %,
0.70 the Mg of quality %-1.3 quality %,
0.01 the Cr of quality %-0.30 quality %,
0.005 the Zn of quality %-0.50 quality %,
0.01 the Ti of quality %-0.20 quality % and
0.05 the Zr of quality %-0.20 quality %,
Surplus is Al and subsidiary impurity,
The described Si and the part among the Mg that comprise are Mg
2The form of Si, and Mg
2Ratio Mg between the total content of the content of Si and Mn and Cr
2Si/ (Mn+Cr) is 1.0 to 2.1,
Described bolt has
More than or equal to the tensile strength of 380MPa,
More than or equal to 0.2% proof stress of 350MPa and
Elongation more than or equal to 6%.
8. a method of making bolt comprises the steps:
Each defined described bolt in the claim 1 to 5 is cut to predetermined length with aluminum alloy line;
Bolt after the cutting is carried out cold pressure with aluminum alloy line make processing to form the head of bolt;
Bolt after the described cutting is formed rolling to form the threaded portion of bolt with aluminum alloy line; And
Target object in the process of being made bolt by described bolt with aluminum alloy line is carried out solution annealing and ageing treatment.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011250528A JP5335056B2 (en) | 2011-11-16 | 2011-11-16 | Aluminum alloy wire for bolt, bolt and method for producing the same |
| JP2011-250528 | 2011-11-16 | ||
| PCT/JP2012/079512 WO2013073575A1 (en) | 2011-11-16 | 2012-11-14 | Aluminum alloy wire for use in bolts, bolt, and manufacturing method of these. |
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| CN103339276A true CN103339276A (en) | 2013-10-02 |
| CN103339276B CN103339276B (en) | 2015-06-10 |
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| JP (1) | JP5335056B2 (en) |
| KR (1) | KR101781669B1 (en) |
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| CN106164504A (en) * | 2014-03-20 | 2016-11-23 | 日本发条株式会社 | Secure component and secure component bar-like member |
| CN106834822A (en) * | 2017-02-13 | 2017-06-13 | 江苏亨通电力特种导线有限公司 | Fastening parts of automobiles high-strength aluminum alloy bar and preparation method thereof |
| CN106868352A (en) * | 2017-03-09 | 2017-06-20 | 昆山市长发铝业有限公司 | A kind of profile shapes and its preparation method and application |
| CN112853169A (en) * | 2021-01-05 | 2021-05-28 | 中国第一汽车股份有限公司 | High-strength aluminum alloy bolt and manufacturing method thereof |
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| JP5802114B2 (en) * | 2011-11-16 | 2015-10-28 | 住友電気工業株式会社 | Aluminum alloy wire for bolt, bolt and method for producing aluminum alloy wire for bolt |
| JP2013234389A (en) * | 2013-07-24 | 2013-11-21 | Sumitomo Electric Ind Ltd | Aluminum alloy wire for bolt, bolt and methods of manufacturing the same |
| JP6368087B2 (en) * | 2013-12-26 | 2018-08-01 | 住友電気工業株式会社 | Aluminum alloy wire, method for producing aluminum alloy wire, and aluminum alloy member |
| JP6420553B2 (en) * | 2014-03-03 | 2018-11-07 | 住友電気工業株式会社 | Aluminum alloy, aluminum alloy wire, aluminum alloy wire manufacturing method, aluminum alloy member manufacturing method, and aluminum alloy member |
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| US11279990B2 (en) | 2016-02-19 | 2022-03-22 | Nhk Spring Co., Ltd. | Aluminum alloy and fastener member |
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| EP4052814A4 (en) * | 2019-10-31 | 2023-11-15 | Matsumoto Heavy Industry Co., Ltd. | Aluminum alloy bolt and method for manufacturing same |
| WO2021153286A1 (en) * | 2020-01-31 | 2021-08-05 | 日本発條株式会社 | Fastening member |
| WO2022249664A1 (en) * | 2021-05-27 | 2022-12-01 | 住友電気工業株式会社 | Aluminum alloy, aluminum alloy wire, and method for manufacturing aluminum alloy wire |
| JPWO2022249665A1 (en) * | 2021-05-27 | 2022-12-01 |
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- 2012-11-14 KR KR1020137020437A patent/KR101781669B1/en active IP Right Grant
- 2012-11-14 CN CN201280007038.0A patent/CN103339276B/en active Active
- 2012-11-14 DE DE112012000343.8T patent/DE112012000343B4/en active Active
- 2012-11-14 WO PCT/JP2012/079512 patent/WO2013073575A1/en active Application Filing
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| CN1263566A (en) * | 1998-04-08 | 2000-08-16 | 本田技研工业株式会社 | Method of manufacturing aluminum alloy for flattening material and aluminum alloy flattening material for automobiles |
| CN102119233A (en) * | 2008-08-11 | 2011-07-06 | 住友电气工业株式会社 | Aluminum alloy wire |
| JP2011001602A (en) * | 2009-06-18 | 2011-01-06 | Kobe Steel Ltd | Aluminum alloy wire rod material for high-strength bolt having excellent formability, method for producing the same, high-strength flange bolt and method for producing the same |
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| CN106164504A (en) * | 2014-03-20 | 2016-11-23 | 日本发条株式会社 | Secure component and secure component bar-like member |
| CN106834822A (en) * | 2017-02-13 | 2017-06-13 | 江苏亨通电力特种导线有限公司 | Fastening parts of automobiles high-strength aluminum alloy bar and preparation method thereof |
| WO2018145503A1 (en) * | 2017-02-13 | 2018-08-16 | 江苏亨通电力特种导线有限公司 | High-strength aluminum alloy rod for use in vehicle fastener and manufacturing method for the rod |
| CN106868352A (en) * | 2017-03-09 | 2017-06-20 | 昆山市长发铝业有限公司 | A kind of profile shapes and its preparation method and application |
| CN112853169A (en) * | 2021-01-05 | 2021-05-28 | 中国第一汽车股份有限公司 | High-strength aluminum alloy bolt and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| DE112012000343T5 (en) | 2013-10-02 |
| CN103339276B (en) | 2015-06-10 |
| DE112012000343B4 (en) | 2022-09-01 |
| JP5335056B2 (en) | 2013-11-06 |
| JP2013104122A (en) | 2013-05-30 |
| KR20130121927A (en) | 2013-11-06 |
| WO2013073575A1 (en) | 2013-05-23 |
| KR101781669B1 (en) | 2017-09-25 |
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