CN104532077B - 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 PDFInfo
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- CN104532077B CN104532077B CN201410708568.9A CN201410708568A CN104532077B CN 104532077 B CN104532077 B CN 104532077B CN 201410708568 A CN201410708568 A CN 201410708568A CN 104532077 B CN104532077 B CN 104532077B
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- 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
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/047—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with magnesium as the next major constituent
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
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- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
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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
Technical field
The present invention relates to a kind of manufacture method of Aluminum alloy for automotive body sheet material is and in particular to a kind of body of a motor car is used
The short process making method of 6xxx system sheet alloy.
Background technology
Currently, the energy, environmental protection, safety are the three big problems that world today's auto industry faces, and automotive light weight technology is to reduce
Energy consumption, the effective way improving automobile fuel ecomomy, reducing environmental pollution.Aluminium and its alloy are firm due to having specific strength and ratio
A series of good characteristics such as the recycling rate that degree is high, shock resistance is good, formability is excellent and high, become automobile
The optimal material of lightweight.
Aluminium alloy for vehicle body plate mainly has 5xxx system and 6xxx system alloy, for surface quality requirements height, shape
The simple automobile panel of shape, often uses 6xxx system alloy material.As automobile panel material, its surface quality to close weight
Will.Because processing technology is improper in 6xxx system sheet alloy manufacture process, sheet material easily occurs being in banding along parallel to rolling direction
Cube orientation of distribution or Gauss orientation crystal grain, because the deformation of different orientation band is inconsistent in follow-up punching forming process,
Cause plate surface regular protuberance to occur and is recessed, form painting brush line, affect automobile appearance.At present, it is to avoid painting brush occurs
The most popular method of line defect is increase intermediate annealing process in sheet material preparation flow, and that is, conventional sheet preparation section includes:
Alloy melting, casting, homogenization, hot rolling, cold rolling, intermediate annealing, cold rolling, solution treatment and Pre-aging treatment.Obviously, centre is moved back
The introducing of fiery process not only extends the sheet material production cycle, reduces production efficiency, also add energy consumption simultaneously, improves sheet material life
Produce cost.
Patent cn 02807312.6 discloses a kind of mouldability and the excellent aluminium alloy plate of coating sintering (baking vanish) hardening
And its manufacture method, 6000 with mg and si as main component are after alloy cast ingot is homogenized through more than 450 DEG C of temperature,
Again 350～500 DEG C of temperature are down to 100 DEG C/h speed and carry out hot rolling, hot rolled after, direct cold rolling, to finished plate thickness, is carried out
Solution treatment.Good mouldability and baking vanish hardening capacity are had using the sheet alloy of this patent manufacture, but its surface quality
As the features such as painting brush line are failed to understand.
Patent cn 200710199495.5 discloses a kind of excellent aluminium alloy plate of ambient-temp-stable performance and its manufacturer
Method, alloy contains si:0.5～1.5%, mg:0.35～1.0%, mn:0.01～1.0%, cu:0.001～1.0%, wherein solid
Molten si amount: 0.55～0.80%, solid solution mg amount: 0.35～0.60%, and solid solution si amount/solid solution mg amount: 1.1～2.Alloy is cast
Ingot first cools down after homogenization, heats afterwards again and carries out hot rolling, 490～380 DEG C of the hot roughing inlet temperature of control, goes out to shut out mouth temperature
430～350 DEG C of degree, does not carry out intermediate annealing direct cold rolling and carries out follow-up solution treatment and preageing again, using this after hot rolling
The sheet alloy of patent manufacture has excellent ambient-temp-stable performance, but its surface quality such as feature such as painting brush line is failed to understand.In addition,
This patent is by mg, si solid solution capacity in alloy and aluminum alloy heat roughing process parameter control, the short route realizing sheet material is (in no
Between anneal) preparation, namely the requirement to solid solution element content in alloy be this patent realize premise.
Content of the invention
It is an object of the invention to overcoming prior art not enough, for general 6xxx system alloy, proposing one kind and not adopting
The method that the abbreviated system of intermediate annealing prepares the surface no 6xxx line aluminium alloy car body panel of painting brush line.
The technical scheme is that a kind of short process making method of no painting brush line 6xxx line aluminium alloy car body panel, bag
Include following steps:
1. fine aluminium, various intermediate alloy are melted by proportioning, using the casting of D.C.casting equipment after the refined process of melt
Produce ingot casting；
2. ingot casting is carried out putting into after crop and milling face and in heat-treatment furnace, carry out Homogenization Treatments；
3. complete the ingot casting after Homogenization Treatments and be cooled to start rolling temperature, after insulation 1～10h, start hot rolling, the operation of rolling
Middle control hot finishing outlet temperature is 320～360 DEG C, and hot finishing last a time strain rate is more than 40s-1, hot finishing stagnation pressure
Lower rate is more than 77%；
4. it is cooled to room temperature after hot rolled plate winding, direct cold rolling becomes finished plate thickness, in cold-rolled process, control cold rolling
Lower rate is 30～70%；
5. the cold rolled sheet obtaining in 4. is carried out Pre-aging treatment after solid solution, Water Quenching and can obtain production board
Material.
Further, step 1. described in each component of intermediate alloy and its mass percent be: si:0.5～1.5wt%,
Mg:0.25～0.6wt%, fe≤0.3wt%, mn≤0.2wt%, balance of al and normal impurities, and, total impurities are less than
0.15wt%, every kind of impurity content is less than 0.05wt%.2. middle Homogenization Treatments temperature need to ensure at 500 DEG C described step
More than, temperature retention time is more than 5h.
Preferably, step 3. described in hot rolling be the hot rolling being made up of the finishing mill of reversible hot rough rolling mill and continous way
Line.
Preferably, step 4. described in hot rolled plate winding after be cooled to room temperature speed be less 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, temperature retention time be 15s～
30min；Pre-ageing treatment temperature is 60～100 DEG C, and temperature retention time is 2～10h.
The effect of the present invention is mainly reflected in: (1) present invention adopts abbreviated system to prepare 6xxx line aluminium alloy sheet material, no
Only shorten sheet material production cycle, improve production efficiency, also reduce energy consumption simultaneously, reduce sheet material production cost；(2) present invention
Self annealing hot rolled plate is carried out cold rolling, control cold rolling reduction ratio to be 30～70%, eliminate the orange peel effect of piece surface generation
And painting brush line defect；(3) present invention makes hot rolled and subsequent cooled of 6xxx line aluminium alloy by controlling hot-rolled process parameter
There is self annealing in journey, cold rolling reduction ratio is controlled simultaneously, final realization no painting brush line 6xxx line aluminium alloy car body panel
Prepared by short route.
Brief description
Fig. 1 is the aluminum alloy sheet material surface painting brush line design sketch through the embodiment of the present invention 1 preparation；
Fig. 2 is the aluminum alloy sheet material surface painting brush line design sketch through the embodiment of the present invention 2 preparation；
Fig. 3 is the aluminum alloy sheet material surface painting brush line design sketch through comparative example 6 of the present invention preparation.
Specific embodiment
Inventor is in vehicle body with, in 6xxx line aluminium alloy sheet material development process, exploring by hot-rolled process parameter
Adjustment, makes 6xxx line aluminium alloy, in hot rolled and subsequent cooling procedure, self annealing occur, saves intermediate annealing process, simultaneously
Cold rolling reduction ratio is controlled, realizes the no painting brush line of sheet material.
Thus, the invention provides a kind of abbreviated system not adopting intermediate annealing prepares surface no painting brush line 6xxx system
The method of car body of aluminum alloy plate, comprises the following steps:
First fine aluminium, various intermediate alloy are pressed proportioning (si:0.5～1.5wt%；Mg:0.25～0.6wt%；fe≤
0.3wt%；Mn≤0.2wt%；Balance of al and normal impurities, total impurities are less than 0.15wt%, and, every kind of impurity element contains
Amount is less than 0.05wt%) melted, go out ingot casting using D.C.casting apparatus for casting after the refined process of melt.
Above-mentioned ingot casting is carried out putting into after crop and milling face and in heat-treatment furnace, carries out Homogenization Treatments, Homogenization Treatments temperature
Need to ensure more than 500 DEG C, temperature retention time is more than 5h.Complete the ingot casting after Homogenization Treatments and be cooled to start rolling temperature insulation 1
Start hot rolling after～10h；For mass production, the heat that hot rolling is preferably made up of the finishing mill of reversible hot rough rolling mill and continous way
Rolling line, this Hot Line is generally made up of 1 reversible roughing mill and 3～5 continous way finishing mills.Hot rolling start rolling temperature is
450～550 DEG C, hot finishing outlet temperature is controlled to be 320～360 DEG C in the operation of rolling, hot finishing last a time strain rate
More than 40s-1And hot finishing total reduction is more than 77%.After the winding of above-mentioned hot rolled plate, room is cooled to the cooling rate less than 20 DEG C/h
Temperature, then direct cold rolling is to the finished plate thickness of 0.5～2.5mm it is ensured that cold rolling reduction ratio is 30～70%.The cold-reduced sheet obtaining
Material carries out Pre-aging treatment after solid solution, Water Quenching and can obtain finished product sheet material.Wherein solid solution temperature is 500～560
DEG C, temperature retention time is 15s～30min；Pre-ageing treatment temperature is 60～100 DEG C, and temperature retention time is 2～10h.
Hereinafter, contrastively examples and comparative examples of the present invention are described, one can be entered according to these embodiments and comparative example
The technique effect of the step confirmation present invention.But, cited embodiment is only the preferred embodiment of the present invention, should not be managed
Solve the scope for the above-mentioned theme of the present invention and be only limitted to this, all technical schemes being formed based on the technology of the present invention design, each fall within
Within protection scope of the present invention.
[embodiment]
The 6xxx line aluminium alloy composition that following embodiment and comparative example are adopted is: si:1.06wt%, mg:
0.45wt%, fe:0.18wt%, mn:0.13wt%, balance of al and normal impurities, and, total impurities are less than 0.15wt%,
Every kind of impurity content is less than 0.05wt%.The 6xxx aluminium alloy of mentioned component is carried out through the slab ingot that semi-continuous casting obtains
Carry out Homogenization Treatments after crop, milling face, 550 DEG C of insulation 10h, along with the furnace cooling more afterwards are warming up to stove with the speed of 30 DEG C/h
Carry out hot rolling and subsequently cold rolling to 500 DEG C of insulation 2h, concrete hot rolling, cold-rolling process are as shown in table 1.The final cold rolling plate that will obtain
Material, the Pre-aging treatment of the solution treatment and 80 DEG C × 10h that carry out 550 DEG C × 1min obtains finished product sheet material.
By finished product sheet material park January carry out yield strength (ys), tensile strength (uts) and elongation percentage (el) test；Sheet material
Carry out yield strength (ys/bh) test after 2% pre-stretching+185 DEG C × 20min simulation baking vanish.All Mechanics Performance Testing samples
Product are sampled along vertical rolling direction, and specimen size adopts the a50 tensile sample of the recommendation of gb/t228.
The finished product sheet material after January will be deposited, intercepted length is 250mm, width is that the rectangle sample of 35mm carries out surface lacquer
Brush line assessment, perpendicular to rolling direction, width is along rolling direction in sample length direction.Sample is pre-stretched along its length
10%, then with the slight polishing to plate surface of 320# sandstone, then carry out plate surface painting brush line strength evaluation.Table 2 below is given
Mechanical property and the painting brush line assessment result of embodiment and comparative example are gone out.
In embodiment as shown in table 1, the sheet material according to the preparation of sequence number 1～5 technique meets application claims, and comparative example
Though the 6,7 and 8 is also short route preparation technology, because being unsatisfactory for the processing range of the present invention, lead to the result that
Comparative example 6 final cold rolling rate be 80%, beyond present invention provide that 30～70% scopes, though alloy hot rolled after send out
Raw most of recrystallization, but because cold rolling rate is too big, final sheet material painting brush line is very strong, as shown in Figure 3.
Comparative example 7 sheet material hot finishing total reduction be 60%, less than present invention provide that 77%, only send out after alloy is hot rolled
Raw a small amount of recrystallize, though follow-up cold rolling rate meet present invention provide that, final sheet material painting brush line is still very strong.
Comparative example 8 sheet material hot finishing outlet temperature be 285 DEG C, less than present invention provide that 320～360 DEG C, alloy is through warm
Be organized as fibrous Deformation structure after rolling, though follow-up cold rolling rate meet present invention provide that, final sheet material painting brush line is still very strong.
Comparative example 9,10 and 11 be conventional production process, wherein comparative example 10 because follow-up cold rolling rate excessive, though moving back through centre
Fire, final sheet material painting brush line is still very strong.As shown in Table 2, had using the sheet material of present invention process preparation and produce work with conventional
The suitable mechanical property of skill, plate surface quality is good (as depicted in figs. 1 and 2) simultaneously.
In summary, car body panel is prepared using the inventive method, not only shorten the sheet material production cycle, improve and produce effect
Rate, also reduces energy consumption simultaneously, reduces production cost, has good industrial prospect.
Table 1: hot rolling that embodiment and comparative example are adopted, cold-rolling process
Table 2: the mechanical property of embodiment and comparative example and surface quality evaluation result
Claims (5)
1. a kind of short process making method of no painting brush line 6xxx line aluminium alloy car body panel it is characterised in that: comprise the following steps:
1. fine aluminium, various intermediate alloy are melted by proportioning, gone out using D.C.casting apparatus for casting after the refined process of melt
Ingot casting；The each component of described intermediate alloy and its mass percent are: si:0.5～1.5 wt%, mg:0.25～0.6 wt%, fe
≤ 0.3 wt%, mn≤0.2 wt%, balance of al and normal impurities, and, total impurities are less than 0.15 wt%, every kind of impurity
Constituent content is less than 0.05 wt%；
2. ingot casting is carried out putting into after crop and milling face and in heat-treatment furnace, carry out Homogenization Treatments；
3. complete the ingot casting after Homogenization Treatments and be cooled to start rolling temperature, start hot rolling after insulation 1～10h, control in the operation of rolling
Heat exit temperature at finishing and be 320～360 DEG C, hot finishing last a time strain rate is more than 40s-1, hot finishing total reduction
More than 77%；
4. it is cooled to room temperature after hot rolled plate winding, direct cold rolling becomes finished plate thickness, controls cold rolling reduction ratio in cold-rolled process
For 30～70%；
5. the cold rolled sheet obtaining in 4. is carried out Pre-aging treatment after solid solution, Water Quenching and can obtain finished product sheet material.
2. the short process making method of no painting brush line 6xxx line aluminium alloy car body panel according to claim 1, its feature exists
In: 2. middle Homogenization Treatments temperature need to ensure more than 500 DEG C described step, and temperature retention time is more than 5h.
3. the short process making method of no painting brush line 6xxx line aluminium alloy car body panel according to claim 1, its feature exists
In: step 3. described in hot rolling be the Hot Line being made up of the finishing mill of reversible hot rough rolling mill and continous way.
4. the short process making method of no painting brush line 6xxx line aluminium alloy car body panel according to claim 1, its feature exists
In: step 4. described in be cooled to the speed of room temperature after hot rolled plate winding and be less than 20 DEG C/h, described cold rolling finished plate thickness is
0.5～2.5mm.
5. the short process making method of no painting brush line 6xxx line aluminium alloy car body panel according to claim 1, its feature exists
In: step 5. described in cold rolled sheet solid solution temperature be 500～560 DEG C, temperature retention time is 15s～30min；At preageing
Reason temperature is 60～100 DEG C, and temperature retention time is 2～10h.
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| CN201410708568.9A CN104532077B (en) | 2014-11-28 | 2014-11-28 | Short-flow preparation method for 6XXX-series aluminum alloy automotive body sheet without paint brushed lines |
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| CN201410708568.9A CN104532077B (en) | 2014-11-28 | 2014-11-28 | Short-flow preparation method for 6XXX-series aluminum alloy automotive body sheet without paint brushed lines |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2017015186A1 (en) * | 2015-07-20 | 2017-01-26 | Novelis Inc. | Aa6xxx aluminum alloy sheet with high anodized quality and method for making 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 |
| 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 |
| CN109234584B (en) * | 2018-10-31 | 2020-05-05 | 中铝瑞闽股份有限公司 | Medium-strength aluminum alloy strip for GIL shell and preparation method thereof |
| EP3666915A1 (en) * | 2018-12-11 | 2020-06-17 | Constellium Neuf Brisach | Method of making 6xxx aluminium sheets with high surface quality |
| CN111521498A (en) * | 2020-05-22 | 2020-08-11 | 中国第一汽车股份有限公司 | Metal plate paint brush line strain limit testing method and testing device |
| CN112522550B (en) * | 2020-11-04 | 2022-10-04 | 佛山科学技术学院 | Aluminum alloy with rapid aging response and preparation method and application thereof |
| JP2023021838A (en) * | 2021-08-02 | 2023-02-14 | 株式会社Uacj | Aluminum alloy sheet for molding and method for manufacturing the same |
| CN115198073B (en) * | 2022-07-25 | 2023-10-24 | 中铝瑞闽股份有限公司 | Preparation method of homogenized and heated separated 6xxx aluminum alloy plate |
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| CA2450767C (en) * | 2001-07-23 | 2010-09-14 | Corus Aluminium Walzprodukte Gmbh | Weldable high strength al-mg-si alloy |
| CN103255324B (en) * | 2013-04-19 | 2017-02-08 | 北京有色金属研究总院 | Aluminum alloy material suitable for manufacturing car body panel and preparation method |
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Address after: 215026 Jiangsu Province, Suzhou City Industrial Park, No. 200 East Shen Hu Lu Co-patentee after: CHINALCO INSTITUTE OF SCIENCE AND TECHNOLOGY CO., LTD. Patentee after: Suzhou Non-ferrous Metal academy Co., Ltd. Address before: 215026 Jiangsu Province, Suzhou City Industrial Park, No. 200 East Shen Hu Lu Co-patentee before: CHINALCO SCIENCE AND TECHNOLOGY INSTITUTE Patentee before: Suzhou Non-ferrous Metal academy Co., Ltd. |
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Effective date of registration: 20171120 Address after: 102209 Changping District City, Beiqijia, the future of science and technology in the south area of the town of Beijing Patentee after: China Aluminum Material Applied Research Institute Co Ltd Address before: 215026 Jiangsu Province, Suzhou City Industrial Park, No. 200 East Shen Hu Lu Co-patentee before: CHINALCO INSTITUTE OF SCIENCE AND TECHNOLOGY CO., LTD. Patentee before: Suzhou Non-ferrous Metal academy Co., Ltd. |
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