CN104532077A - Short-flow preparation method for 6XXX-series aluminum alloy automotive body sheet without paint brushed lines - Google Patents

Short-flow preparation method for 6XXX-series aluminum alloy automotive body sheet without paint brushed lines Download PDF

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Publication number
CN104532077A
CN104532077A CN201410708568.9A CN201410708568A CN104532077A CN 104532077 A CN104532077 A CN 104532077A CN 201410708568 A CN201410708568 A CN 201410708568A CN 104532077 A CN104532077 A CN 104532077A
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rolling
sheet
hot
cold
6xxx
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CN201410708568.9A
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CN104532077B (en
Inventor
赵丕植
吴新星
邹立颖
张琪
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China Aluminum Material Applied Research Institute Co Ltd
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CHINALCO SCIENCE AND TECHNOLOGY INSTITUTE
Suzhou Nonferrous Metal Research Institute Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/02Alloys based on aluminium with silicon as the next major constituent
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/06Alloys based on aluminium with magnesium as the next major constituent
    • C22C21/08Alloys based on aluminium with magnesium as the next major constituent with silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/043Changing 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
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/047Changing 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

Abstract

The invention provides a short-flow preparation method for a 6XXX-series aluminum alloy automotive body sheet without paint brushed lines, wherein the preparation method comprises the steps: firstly, smelting and casting pure aluminum and various intermediate alloys into ingots according to the proportion; then carrying out homogenization treatment on the ingots, cooling to an initial rolling temperature after homogenization treatment, carrying out heat preservation, then starting hot rolling, and controlling a hot finish rolling outlet temperature to be 320-360 DEG C, the final-pass strain rate to be more than 40 s<-1> and the hot finish rolling total reduction rate to be more than 77%; followed by, when a hot-rolled sheet is cooled to the room temperature, directly cold-rolling into a finished-product sheet thickness, and in the cold-rolling process, controlling the cold-rolling reduction ratio to be 30-70%; and finally, after the cold-rolled sheet is subjected to solid solution and water quenching treatment, carrying out pre-aging treatment to obtain the finished-product sheet. The preparation method not only can shorten the sheet production cycle and improve the production efficiency, but also reduces the energy consumption, and lowers the production cost of the sheet; and the surface of the obtained sheet has no paint brush lines, has good mechanical properties, and is better suitable for automotive body covering parts.

Description

Without the short process making method of painting brush line 6XXX line aluminium alloy car body panel
Technical field
The present invention relates to a kind of manufacture method of Aluminum alloy for automotive body sheet material, be specifically related to the short process making method of a kind of body of a motor car 6XXX system sheet alloy.
Background technology
Current, the energy, environmental protection, safety are the three large problems that world today's automotive industry faces, and automotive light weight technology is the effective way reducing energy consumption, improve automobile fuel ecomomy, reduce environmental pollution.Aluminum-aluminum alloy, owing to having specific tenacity and a series of good characteristic such as specific rigidity is high, shock resistance is good, formability the is excellent and high rate of recovery again, becomes the optimal material of automotive light weight technology.
Aluminium alloy for vehicle body plate mainly contains 5XXX system and 6XXX system alloy, the automobile panel of, simple shape high for surface quality requirements, often uses 6XXX system alloy material.As automobile panel material, its surface quality is most important.Because complete processing is improper in 6XXX system sheet alloy manufacturing processed, sheet material easily occurs in cube orientation of zonal arrangement or Gauss's orientation crystal grain along being parallel to rolling direction, distortion due to different orientation band in follow-up punching forming process is inconsistent, plate surface is caused to occur regular protuberance and depression, form painting brush line, affect automobile appearance.At present, avoid occurring that the most popular method of painting brush L&S line defect increases process annealing process in sheet material preparation flow, namely conventional sheet preparation section comprises: alloy melting, casting, homogenizing, hot rolling, cold rolling, process annealing, cold rolling, solution treatment and Pre-aging treatment.Obviously, the introducing of process annealing process not only extends the board materials production cycle, reduces production efficiency, also add energy consumption simultaneously, improve board materials production cost.
Patent CN 02807312.6 discloses a kind of formability and the excellent aluminium alloy plate of coating sintering (baking vanish) hardening and manufacture method thereof, be main component with Mg and Si 6000 is alloy cast ingot after the temperature of more than 450 DEG C carries out homogenizing, be down to 350 ~ 500 DEG C of temperature with 100 DEG C/h speed again and carry out hot rolling, after hot rolling, direct cold rolling, to finished plate thickness, carries out solution treatment.Adopt the sheet alloy of this patent manufacture to have good formability and bake hardening performance, but its surface quality such as features such as painting brush line are failed to understand.
Patent CN 200710199495.5 discloses a kind of aluminium alloy plate and manufacture method thereof of ambient-temp-stable performance excellence, alloy contains Si:0.5 ~ 1.5%, Mg:0.35 ~ 1.0%, Mn:0.01 ~ 1.0%, Cu:0.001 ~ 1.0%, wherein solid solution Si measures: 0.55 ~ 0.80%, solid solution Mg measures: 0.35 ~ 0.60%, and solid solution Si amount/solid solution Mg measures: 1.1 ~ 2.Alloy cast ingot first cools after homogenizing, reheat afterwards and carry out hot rolling, control hot roughing temperature in 490 ~ 380 DEG C, go out to roll temperature out 430 ~ 350 DEG C, do not carry out process annealing direct cold rolling after hot rolling and carry out follow-up solution treatment and preageing again, adopt the sheet alloy of this patent manufacture to have excellent ambient-temp-stable performance, but its surface quality such as features such as painting brush line are failed to understand.In addition, this patent, by Mg, Si solid solution capacity and aluminum alloy heat roughing process parameter control in alloy, realizes short route (without the process annealing) preparation of sheet material, is also that the requirement of solid solution element content in alloy is the prerequisite that this patent realizes.
Summary of the invention
The object of the invention is to overcome prior art deficiency, for general 6XXX system alloy, propose a kind of method of abbreviated system preparation surface without the 6XXX line aluminium alloy car body panel of painting brush line not adopting process annealing.
Technical scheme of the present invention is: a kind of short process making method without painting brush line 6XXX line aluminium alloy car body panel, comprises the following steps:
1. fine aluminium, various master alloy are melted by proportioning, melt utilizes D.C.casting apparatus for casting to go out ingot casting after refining treatment;
2. put into heat treatment furnace after ingot casting being carried out crop and milling face and carry out Homogenization Treatments;
3. the ingot casting completed after Homogenization Treatments is cooled to start rolling temperature, and start hot rolling after insulation 1 ~ 10h, controlling hot finishing temperature out in the operation of rolling is 320 ~ 360 DEG C, and last passage strain rate of hot finishing is more than 40s -1, hot finishing total reduction is more than 77%;
4. after hot-rolled sheet rolling, be cooled to room temperature, direct cold rolling becomes finished plate thickness, and controlling cold rolling draft in cold-rolled process is 30 ~ 70%;
5. the cold rolled sheet obtained in is 4. carried out Pre-aging treatment after solid solution, Water Quenching and can obtain finished product sheet material.
Further, step 1. described in each component of master alloy and mass percent thereof be: Si:0.5 ~ 1.5wt%, Mg:0.25 ~ 0.6wt%, Fe≤0.3wt%, Mn≤0.2wt%, surplus is Al and normal impurities, and, total impurities is lower than 0.15wt%, and often kind of impurity content is lower than 0.05wt%.Described step 2. middle Homogenization Treatments temperature need ensure more than 500 DEG C, and soaking time is more than 5h.
Preferably, step 3. described in hot rolling be the Hot Line be made up of the finishing mill of reversible hot rough rolling mill and continous way.
Preferably, step 4. described in be cooled to room temperature after hot-rolled sheet rolling speed be no more than 20 DEG C/h, described cold rolling finished plate thickness is 0.5 ~ 2.5mm.
Preferably, step 5. described in cold rolled sheet solid solution temperature be 500 ~ 560 DEG C, soaking time is 15s ~ 30min; Pre-ageing treatment temperature is 60 ~ 100 DEG C, and soaking time is 2 ~ 10h.
Effect of the present invention is mainly reflected in: (1) the present invention adopts abbreviated system to prepare 6XXX line aluminium alloy sheet material, not only shortens the board materials production cycle, enhances productivity, also reduce energy consumption simultaneously, reduces board materials production cost; (2) the present invention carries out cold rolling to self-annealing hot-rolled sheet, and controlling cold rolling draft is 30 ~ 70%, eliminates orange peel effect and the painting brush L&S line defect of piece surface generation; (3) the present invention makes 6XXX line aluminium alloy, in hot rolling and process of cooling subsequently, self-annealing occur by controlling hot-rolled process parameter, and control cold rolling draft, final realization is prepared without the short route of painting brush line 6XXX line aluminium alloy car body panel simultaneously.
Accompanying drawing explanation
Fig. 1 is the aluminum alloy sheet material surface painting brush line design sketch prepared through the embodiment of the present invention 1;
Fig. 2 is the aluminum alloy sheet material surface painting brush line design sketch prepared through the embodiment of the present invention 2;
Fig. 3 is the aluminum alloy sheet material surface painting brush line design sketch prepared through comparative example 6 of the present invention.
Embodiment
Inventor at vehicle body with in 6XXX line aluminium alloy sheet material performance history, explore the adjustment by hot-rolled process parameter, make 6XXX line aluminium alloy, in hot rolling and process of cooling subsequently, self-annealing occur, save process annealing process, cold rolling draft is controlled simultaneously, realize sheet material without painting brush line.
Thus, the invention provides a kind of abbreviated system of process annealing that do not adopt and prepare the method for surface without painting brush line 6XXX line aluminium alloy car body panel, comprise the following steps:
First fine aluminium, various master alloy are pressed proportioning (Si:0.5 ~ 1.5wt%; Mg:0.25 ~ 0.6wt%; Fe≤0.3wt%; Mn≤0.2wt%; Surplus is Al and normal impurities, and total impurities is lower than 0.15wt%, and often kind of impurity content is lower than 0.05wt%) melt, melt utilizes D.C.casting apparatus for casting to go out ingot casting after refining treatment.
Put into heat treatment furnace after above-mentioned ingot casting is carried out crop and milling face and carry out Homogenization Treatments, Homogenization Treatments temperature need ensure more than 500 DEG C, and soaking time is more than 5h.Complete after the ingot casting after Homogenization Treatments is cooled to start rolling temperature insulation 1 ~ 10h and start hot rolling; In order to mass production, the Hot Line that hot rolling is preferably made up of the finishing mill of reversible hot rough rolling mill and continous way, this Hot Line is made up of 1 reversible roughing mill and 3 ~ 5 continous way finishing mills usually.Hot rolling start rolling temperature is 450 ~ 550 DEG C, and controlling hot finishing temperature out in the operation of rolling is 320 ~ 360 DEG C, and last passage strain rate of hot finishing is more than 40s -1and hot finishing total reduction is more than 77%.After above-mentioned hot-rolled sheet rolling, be chilled to room temperature with the cooling rate being no more than 20 DEG C/h, the finished plate thickness of then direct cold rolling to 0.5 ~ 2.5mm, ensure that cold rolling draft is 30 ~ 70%.The cold rolled sheet obtained carries out Pre-aging treatment after solid solution, Water Quenching can obtain finished product sheet material.Wherein solid solution temperature is 500 ~ 560 DEG C, and soaking time is 15s ~ 30min; Pre-ageing treatment temperature is 60 ~ 100 DEG C, and soaking time is 2 ~ 10h.
Below, contrastively examples and comparative examples of the present invention are described, technique effect of the present invention can be confirmed further according to these embodiments and comparative example.But cited embodiment is only the preferred embodiment of the present invention, the scope that should not be understood as the above-mentioned theme of the present invention is only limitted to this, allly conceives the technical scheme formed based on the technology of the present invention, all falls within protection scope of the present invention.
[embodiment]
The 6XXX line aluminium alloy composition that following embodiment and comparative example adopt is: Si:1.06wt%, Mg:0.45wt%, Fe:0.18wt%, Mn:0.13wt%, surplus is Al and normal impurities, and total impurities is lower than 0.15wt%, and often kind of impurity content is lower than 0.05wt%.The 6XXX aluminium alloy of mentioned component is carried out carrying out Homogenization Treatments behind crop, milling face through the slab ingot that semicontinuous casting obtains, 550 DEG C of insulation 10h are warming up to stove with the speed of 30 DEG C/h, cool to 500 DEG C of insulation 2h afterwards again with the furnace and carry out hot rolling and follow-up cold rolling, concrete hot rolling, cold-rolling process are as shown in table 1.By the final cold rolled sheet obtained, the Pre-aging treatment of the solution treatment and 80 DEG C × 10h of carrying out 550 DEG C × 1min obtains finished product sheet material.
Finished product sheet material is parked and carries out the test of yield strength (YS), tensile strength (UTS) and unit elongation (EL) January; Sheet material is simulated after baking vanish through 2% preliminary draft+185 DEG C × 20min and is carried out yield strength (YS/BH) test.All Mechanics Performance Testing samples sample along vertical rolling direction, and specimen size adopts the A50 tension specimen of the recommendation of GB/T228.
To deposit the finished product sheet material after January, intercepted length is 250mm, and width is that the rectangle sample of 35mm carries out surperficial painting brush line assessment, and sample length direction is perpendicular to rolling direction, and width is along rolling direction.By sample preliminary draft along its length 10%, then with 320# sandstone, plate surface is slightly polished, then carry out the evaluation of plate surface painting brush line strength.Table 2 gives mechanical property and the painting brush line assessment result of embodiment and comparative example below.
In embodiment as shown in table 1, the sheet material prepared according to sequence number 1 ~ 5 technique meets application claims, though and comparative example 6,7 and 8 is also short route preparation technology, because not meeting processing range of the present invention, cause following result:
The final cold rolling rate of comparative example 6 is 80%, exceeds 30 ~ 70% scopes of the present invention's regulation, though most of recrystallize occurs alloy after hot rolling, because cold rolling rate is too large, final sheet material painting brush line is very strong, as shown in Figure 3.
Comparative example 7 sheet material hot finishing total reduction is 60%, and lower than 77% of the present invention's regulation, alloy, after hot rolling, a small amount of recrystallize only occurs, though follow-up cold rolling rate meets the present invention's regulation, final sheet material painting brush line is still very strong.
Comparative example 8 sheet material hot finishing temperature out is 285 DEG C, and lower than 320 ~ 360 DEG C of the present invention's regulation, alloy is organized as fibrous Deformation structure after hot rolling, though follow-up cold rolling rate meets the present invention's regulation, final sheet material painting brush line is still very strong.
Comparative example 9,10 and 11 is conventional production process, wherein comparative example 10 because of follow-up cold rolling rate excessive, though through process annealing, final sheet material painting brush line is still very strong.As shown in Table 2, the sheet material adopting present invention process to prepare has the mechanical property suitable with conventional production process, simultaneously plate surface quality good (as depicted in figs. 1 and 2).
In summary, adopt the inventive method to prepare car body panel, not only shorten the board materials production cycle, enhance productivity, also reduce energy consumption simultaneously, reduce production cost, there is good industrial prospect.
Table 1: the hot rolling that embodiment and comparative example adopt, cold-rolling process
Table 2: the mechanical property of embodiment and comparative example and surface quality evaluation result

Claims (6)

1., without a short process making method for painting brush line 6XXX line aluminium alloy car body panel, it is characterized in that: comprise the following steps:
1. fine aluminium, various master alloy are melted by proportioning, melt utilizes D.C.casting apparatus for casting to go out ingot casting after refining treatment;
2. put into heat treatment furnace after ingot casting being carried out crop and milling face and carry out Homogenization Treatments;
3. the ingot casting completed after Homogenization Treatments is cooled to start rolling temperature, and start hot rolling after insulation 1 ~ 10h, controlling hot finishing temperature out in the operation of rolling is 320 ~ 360 DEG C, and last passage strain rate of hot finishing is more than 40s -1, hot finishing total reduction is more than 77%;
4. after hot-rolled sheet rolling, be cooled to room temperature, direct cold rolling becomes finished plate thickness, and controlling cold rolling draft in cold-rolled process is 30 ~ 70%;
5. the cold rolled sheet obtained in is 4. carried out Pre-aging treatment after solid solution, Water Quenching and can obtain finished product sheet material.
2. the short process making method without painting brush line 6XXX line aluminium alloy car body panel according to claim 1, it is characterized in that: step 1. described in each component of master alloy and mass percent thereof be: Si:0.5 ~ 1.5 wt%, Mg:0.25 ~ 0.6 wt%, Fe≤0.3 wt%, Mn≤0.2 wt%, surplus is Al and normal impurities, and, total impurities is lower than 0.15 wt%, and often kind of impurity content is lower than 0.05 wt%.
3. the short process making method without painting brush line 6XXX line aluminium alloy car body panel according to claim 1, is characterized in that: described step 2. middle Homogenization Treatments temperature need ensure more than 500 DEG C, and soaking time is more than 5h.
4. the short process making method without painting brush line 6XXX line aluminium alloy car body panel according to claim 1, is characterized in that: step 3. described in hot rolling be the Hot Line be made up of the finishing mill of reversible hot rough rolling mill and continous way.
5. the short process making method without painting brush line 6XXX line aluminium alloy car body panel according to claim 1, it is characterized in that: step 4. described in be cooled to room temperature after hot-rolled sheet rolling speed be no more than 20 DEG C/h, described cold rolling finished plate thickness is 0.5 ~ 2.5mm.
6. the short process making method without painting brush line 6XXX line aluminium alloy car body panel according to claim 1, is characterized in that: step 5. described in cold rolled sheet solid solution temperature be 500 ~ 560 DEG C, soaking time is 15s ~ 30min; Pre-ageing treatment temperature is 60 ~ 100 DEG C, and soaking time is 2 ~ 10h.
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105441740A (en) * 2016-01-12 2016-03-30 苏州有色金属研究院有限公司 Autobody 6XXX series aluminium alloy plate with high edge-curling property and manufacturing method thereof
CN105648246A (en) * 2015-09-07 2016-06-08 张英娜 Functional and efficient 6-series aluminum alloy composite mother alloy and preparation and use methods thereof
CN105695810A (en) * 2015-12-15 2016-06-22 东北大学 Mn containing high-silicon aluminum alloy capable of achieving ageing strengthening and preparation method of deformation material thereof
CN109234584A (en) * 2018-10-31 2019-01-18 中铝瑞闽股份有限公司 A kind of GIL shell moderate strength aluminium alloy strips and preparation method thereof
CN111500953A (en) * 2015-07-20 2020-08-07 诺维尔里斯公司 AA6XXX aluminum alloy sheets having high anodic oxidation quality and methods of making the same
CN112522550A (en) * 2020-11-04 2021-03-19 佛山科学技术学院 Aluminum alloy with rapid aging response and preparation method and application thereof
CN113166858A (en) * 2018-12-11 2021-07-23 新布里萨什肯联铝业 Method for producing 6XXX aluminium sheets with high surface quality

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1531602A (en) * 2001-07-23 2004-09-22 �Ʒ� Weldable high strength AI-Mg-Si alloy
CN103255324A (en) * 2013-04-19 2013-08-21 北京有色金属研究总院 Aluminum alloy material suitable for manufacturing car body panel and preparation method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1531602A (en) * 2001-07-23 2004-09-22 �Ʒ� Weldable high strength AI-Mg-Si alloy
CN103255324A (en) * 2013-04-19 2013-08-21 北京有色金属研究总院 Aluminum alloy material suitable for manufacturing car body panel and preparation method

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111500953A (en) * 2015-07-20 2020-08-07 诺维尔里斯公司 AA6XXX aluminum alloy sheets having high anodic oxidation quality and methods of making the same
CN105648246A (en) * 2015-09-07 2016-06-08 张英娜 Functional and efficient 6-series aluminum alloy composite mother alloy and preparation and use methods thereof
CN105695810A (en) * 2015-12-15 2016-06-22 东北大学 Mn containing high-silicon aluminum alloy capable of achieving ageing strengthening and preparation method of deformation material thereof
CN105695810B (en) * 2015-12-15 2017-12-05 东北大学 One kind can ageing strengthening silumin and its deformation material preparation method containing Mn
CN105441740A (en) * 2016-01-12 2016-03-30 苏州有色金属研究院有限公司 Autobody 6XXX series aluminium alloy plate with high edge-curling property and manufacturing method thereof
CN109234584A (en) * 2018-10-31 2019-01-18 中铝瑞闽股份有限公司 A kind of GIL shell moderate strength aluminium alloy strips and preparation method thereof
CN113166858A (en) * 2018-12-11 2021-07-23 新布里萨什肯联铝业 Method for producing 6XXX aluminium sheets with high surface quality
CN112522550A (en) * 2020-11-04 2021-03-19 佛山科学技术学院 Aluminum alloy with rapid aging response and preparation method and application thereof

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