CN100419116C - Preheat treatment for improving automobile plate of 6111 aluminium alloy formation and baking paint hardening performance - Google Patents
Preheat treatment for improving automobile plate of 6111 aluminium alloy formation and baking paint hardening performance Download PDFInfo
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- CN100419116C CN100419116C CNB200610046027XA CN200610046027A CN100419116C CN 100419116 C CN100419116 C CN 100419116C CN B200610046027X A CNB200610046027X A CN B200610046027XA CN 200610046027 A CN200610046027 A CN 200610046027A CN 100419116 C CN100419116 C CN 100419116C
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Abstract
The present invention relates to a preheating process for improving the formability and the stoving varnish hardenability for 6111 aluminum alloy automobile sheets. The preheating process comprises: a 6111 aluminum alloy sheet is made stand at room temperature for 2 hours to 5 days after solid solution treatment and water quenching treatment, and then the 6111 aluminum alloy sheet is preheated at the temperature of 180 DEG C to 200 DEG C for 7 min to 15 min. The preheating process has low temperature, short time, no much energy resource consumption and no need of additional equipment and process investment; when the 6111 aluminum alloy sheet is treated by the present invention, the formability and the strength after varnish stoving can be obviously improved, which are favorable for increasing the stamping rate of finished products and reducing stamping cost for automobile manufacturing plants; the aluminum alloy age hardening latent capacity can be further developed without changing the existing varnish stoving process and equipment, and aluminum alloy sheets are promoted to be widely adopted by the automobile manufacturing plants to replace steel sheets for producing stamping components for outer vehicle bodies of automobiles so as to realize the purpose of reducing the weight; therefore, the present invention can gain outstanding social and economic benefits.
Description
Technical field
The present invention relates to alloy heat treatment technics field, be specifically related to improve the thermal pretreatment technology of 61 11 aluminium alloy automobile plate plasticities and bake hardening.
Background technology
Energy-conserving and environment-protective, safe and reliable requirement make the automobile lightweight imperative.Characteristics such as specific tenacity height, plasticity are good, easy recovery against corrosion become the light-weighted ideal material of automobile to aluminum alloy materials owing to having.Because coachbuilt body accounts for more than 30% of car gross weight at least, the therefore extremely concern of various countries' car manufacturers of calorize of coachbuilt body in recent years.6000 heat-treatable strengthened line aluminium alloy solution hardening attitudes have good forming property, can further bring into play its age hardening potentiality by the coating baking technology of the outer Auto-body Panel of car, thereby become the desirable replacement material of automobile outer body panel.
6000 heat-treatable strengthened line aluminium alloy car body panel sheet materials be after materials processing factory carries out solution hardening, be transported to automobile factory carry out punching press baking vanish be made into then outside bodywork component, natural aging can take place in aluminum alloy plate materials in transportation, reach the T4 state after two weeks, the higher drawing performance of its intensity is not fully up to expectations, and handle its intensity through baking vanish again after the punching press and not only do not have obvious raising, sometimes even also a little less than the T4 state strength of supplied materials, fail to bring into play the baking hardening effect of 6000 line aluminium alloys expection.This phenomenon has seriously hindered the application of 6000 line aluminium alloy thin plates vehicle body drawing parts outside automobile.The approach that addresses this problem mainly contains: the one, suppress natural aging by cryopreservation after the solution treatment, low temperature transportation, and avoid its disadvantageous effect, but this mode is difficult to realize during actual production to the drawing performance; The 2nd, the solution hardening technology of originally carrying out in material produce factory is changed into auto producer finish, back sheet material can not carry out drawing and baking vanish application when obviously natural aging is hardened immediately so that quench, but this needs automobile factory to change ready-made technology and needs to increase extra solution treatment quenching apparatus; The 3rd, by improving the baking vanish temperature and prolonging the age hardening potential of baking vanish time with the performance material, but intensity did not have the problem of obvious raising and the forming property of improving alloy is not had any help after this method only can solve 6000 line aluminium alloy baking vanish, and the enforcement of this method also is subjected to the restriction of the existing baking vanish technology of auto producer in addition; The 4th, weaken or eliminate the disadvantageous effect that natural aging is brought drawing and bake hardening by carry out suitable thermal pretreatment technology in material produce factory.
Turkey scholar Yucel Birol has studied the inherent 60-200 ℃ of thermal pretreatment of carrying out 2-30min of AA6016 alloy solid solution quenching back 10min, found to carry out temperature between 140-180 ℃ in the 10min after the solution hardening, the preageing system of time no longer than 10min can obtain good baking hardening effect after the baking vanish application on the basis that does not weaken AA6016 sheet alloy drawing performance and shaping performance.But too short to the transfer time between the preageing processing after this result of study requirement solution hardening, suitability for industrialized production almost can't realize.Continue health and Yao Bo of domestic pass once studied the preageing technology of carrying out 150 ℃ of preageing 5min after the Al-Mg-Si-Cu alloy solid solution quenches immediately, the hardness of having reported simulation baking behind the preageing is higher than the not result of the hardness of preageing simulation baking, this result of study exists lack very much transfer time equally and can't be applied to suitability for industrialized production, and it does not have systematic study preageing technology, does not relate to the research contents of aluminium alloy plate shaping property yet.
Summary of the invention
At the problem that existing 6111 aluminium alloy automobile plate thermal treatment process exist, the invention provides and a kind ofly can realize the improvement 6111 aluminium alloy automobile plate plasticities of suitability for industrialized production and the thermal pretreatment technology of bake hardening.
The present invention is a research object with 6111 the highest lattens of intensity in 6000 line aluminium alloys that abroad have been applied to produce the coachbuilt body crust, the composition of 6111 alloys with mass percent is: 0.6～1.1%Si, 0.5～1.0%Mg, 0.5～0.9%Cu, 0.1～0.45%Mn, 0.4%Fe, 0.1%Cr, 0.15%Zn, 0.1%Ti, surplus is Al.
Thermal pretreatment technology of the present invention is after with 6111 aluminum alloy plate materials solution treatment, carry out before the drawing.In systematic study 6111 lattens strengthening phase dissolution degrees in the solution treatment process, grain form and Texture Evolution influence rule, and the precipitation strength that influences in rule and the bake hardening process behind sheet material forming of the plasticity of latten separated out kinetics mutually, the GP district forms and reaches back molten feature, β is " on the basis that influences rule research of phase forming core and process such as grow up; by carrying out multiple heat treating regime research; the best heat treating regime of optimization is: after 6111 latten solution hardening are handled; parked 2 hours～5 days; carry out thermal pretreatment; 180 ℃～200 ℃ of treatment temps treatment time 12min～15min under the room temperature.Because after method of the present invention only needs material produce factory with the aluminum alloy plate materials solution treatment, in 2 hours～5 days, carry out once again (180 ℃～200 ℃) * (thermal treatment of 12min～15min), be easy at the scene realize 2 hours～5 days transfer time on technology, and (180 ℃～200 ℃) * (thermal treatment process of 12min～15min) is implemented to control simple and convenient on existing aluminium alloy production line.
Though the inventive method has increased by a procedure for material produce factory, the temperature that this method adopted is lower, and the time is very short, can not expend a large amount of energy and needn't increase equipment and technology investment.The more important thing is that the intensity of 6111 lattens behind its plasticity and baking vanish after the inventive method processing can both obtain apparent in view improvement, this helps auto producer and improves the presswork rate, reduce cost of stamping, and need not to change the potentiality that just can further excavate the aluminium alloy age hardening under the situation that has the baking vanish Processes and apparatus now, promote auto producer extensively to adopt aluminum alloy plate materials to replace steel plate to produce the outer Auto-body Panel of automobile reaching the purpose of loss of weight, thereby it can obtain the significant social economic benefit.
Embodiment
Below in conjunction with embodiment technology of the present invention is done further to replenish and explanation.6111 al alloy components that each embodiment adopts are by percentage to the quality: 1.05%Si, and 0.68%Mg, 0.68%Cu, 0.29%Mn, 0.29%Fe, 0.15%Zn, 0.1%Cr, 0.1%Ti, surplus is Al.
Embodiment 1
After 470 ℃ * 5h+525 ℃ * 18h homogenizing was handled, crop milled face, hot rolling and the thick thin plate of last cold rolling one-tenth 1.2mm to 6111 alloy cast ingots in the circulation wind furnace.Thin plate carries out 540 ℃ * 30min solution treatment shrend in salt bath furnace after, after room temperature is parked 3 days, in drying baker, carry out the thermal treatment of 185 ℃ * 12min, stretch and drawing test after at room temperature parking for 2 weeks again, 170 ℃ * 30min of simulation baking vanish heat treated is carried out in drying baker.
Embodiment 2
After 470 ℃ * 5h+525 ℃ * 18h homogenizing was handled, crop milled face, hot rolling and the thick thin plate of last cold rolling one-tenth 1.2mm to 6111 alloy cast ingots in the circulation wind furnace.Thin plate carries out 540 ℃ * 30min solution treatment shrend in salt bath furnace after, after room temperature is parked 6 hours, in drying baker, carry out the thermal treatment of 200 ℃ * 13min, stretch and drawing test after at room temperature parking for 2 weeks again, 170 ℃ * 30min of simulation baking vanish heat treated is carried out in drying baker.
Embodiment 3
After 470 ℃ * 5h+525 ℃ * 18h homogenizing was handled, crop milled face, hot rolling and the thick thin plate of last cold rolling one-tenth 1.2mm to 6111 alloy cast ingots in the circulation wind furnace.Thin plate carries out 540 ℃ * 30min solution treatment shrend in salt bath furnace after, after room temperature is parked 5 days, in drying baker, carry out the thermal treatment of 180 ℃ * 15min, stretch and drawing test after at room temperature parking for 2 weeks again, 170 ℃ * 30min of simulation baking vanish heat treated is carried out in drying baker.
Embodiment 4
After 470 ℃ * 5h+525 ℃ * 18h homogenizing was handled, crop milled face, hot rolling and the thick thin plate of last cold rolling one-tenth 1.2mm to 6111 alloy cast ingots in the circulation wind furnace.Thin plate carries out 540 ℃ * 30min solution treatment shrend in salt bath furnace after, after room temperature is parked 4 days, in drying baker, carry out the thermal treatment of 190 ℃ * 15min, stretch and drawing test after at room temperature parking for 2 weeks again, 170 ℃ * 30min of simulation baking vanish heat treated is carried out in drying baker.
Embodiment 5
After 470 ℃ * 5h+525 ℃ * 18h homogenizing was handled, crop milled face, hot rolling and the thick thin plate of last cold rolling one-tenth 1.2mm to 6111 alloy cast ingots in the circulation wind furnace.Thin plate carries out 540 ℃ * 30min solution treatment shrend in salt bath furnace after, after room temperature is parked 18 hours, in drying baker, carry out the thermal treatment of 185 ℃ * 14min, stretch and drawing test after at room temperature parking for 2 weeks again, 170 ℃ * 30min of simulation baking vanish heat treated is carried out in drying baker.
Make comparisons and see Table 1 with T4 state (solution treatment shrend+room temperature parked for 2 weeks) 6111 lattens with the performance index after embodiment 1～5 handled 6111 thin plates supply of material state performance index and the baking vanish processing:
The performance index of table 1 after invented technology is handled back and T4 state 6111 lattens supply of material state performance index and baking vanish processing
By table 1 as seen, the punching performance under 6111 latten supply of material states after the art breading of the present invention obviously improves, and the intensity behind the baking vanish all increases, and embodies value of the present invention well.
Claims (1)
1. thermal pretreatment technology of improving 6111 aluminium alloy automobile plate plasticities and bake hardening, after 6111 aluminum alloy plate materials solid solution shrends, parked under the room temperature 2 hours～5 days, carry out thermal pretreatment, 180 ℃～200 ℃ of treatment temps is characterized in that thermal pretreatment 12min～15min.
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| CNB200610046027XA CN100419116C (en) | 2006-03-14 | 2006-03-14 | Preheat treatment for improving automobile plate of 6111 aluminium alloy formation and baking paint hardening performance |
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| CNB200610046027XA CN100419116C (en) | 2006-03-14 | 2006-03-14 | Preheat treatment for improving automobile plate of 6111 aluminium alloy formation and baking paint hardening performance |
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| CN100419116C true CN100419116C (en) | 2008-09-17 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101880801B (en) * | 2010-06-13 | 2012-07-18 | 东北大学 | Aluminum alloy for automobile body of automobile and plate manufacturing method thereof |
| CN101885000B (en) * | 2010-06-13 | 2013-06-12 | 东北大学 | Processing method for increasing stamping formability of 6111 aluminium alloy automobile sheet |
| US8663405B2 (en) * | 2011-01-24 | 2014-03-04 | GM Global Technology Operations LLC | Stamping of age-hardenable aluminum alloy sheets |
| CN102560295B (en) * | 2011-12-31 | 2014-04-16 | 浙江吉利汽车研究院有限公司 | Thermal processing method for improving aluminum alloy stamping forming |
| CN104451479A (en) * | 2014-12-15 | 2015-03-25 | 西南铝业（集团）有限责任公司 | Preparation method of 5A90 aluminum lithium alloy thin plate |
| CN107513678B (en) * | 2016-06-16 | 2019-02-19 | 中国科学院金属研究所 | The production technology and application of strong 7 line aluminium alloy profile in a kind of |
| US10428412B2 (en) * | 2016-11-04 | 2019-10-01 | Ford Motor Company | Artificial aging of strained sheet metal for strength uniformity |
| CN108070803A (en) * | 2017-10-31 | 2018-05-25 | 东北大学 | A kind of 6000 line aluminium alloy thin plate of automobile using returns treatment process |
| CN108588597B (en) * | 2018-05-09 | 2019-09-17 | 中南大学 | A kind of cycle heat treatment method improving aluminium alloy automobile plate baking vanish performance |
| CN112264498B (en) * | 2020-09-30 | 2022-04-15 | 武汉理工大学 | Aluminum alloy pre-strengthening hot stamping forming method |
| CN114653771A (en) * | 2022-02-10 | 2022-06-24 | 山东南山铝业股份有限公司 | Production method of green circulating grade-guaranteeing 6-series high-forming automobile plate |
| CN114798797A (en) * | 2022-03-18 | 2022-07-29 | 上海泽升汽车科技有限公司 | 6111 extrusion aluminum alloy plate punch forming method |
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| CN1141958A (en) * | 1994-06-17 | 1997-02-05 | 古河电气工业株式会社 | Method for production of aluminium alloy plate with good characteristics of shaping and thermo hardening |
| CN1162341A (en) * | 1994-09-06 | 1997-10-15 | 艾尔坎国际有限公司 | Heat treatment process for aluminum alloy sheet |
| CN1697888A (en) * | 2001-03-28 | 2005-11-16 | 住友轻金属工业株式会社 | Aluminum alloy sheet excellent in formability and hardenability during baking of coating and method for production thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1141958A (en) * | 1994-06-17 | 1997-02-05 | 古河电气工业株式会社 | Method for production of aluminium alloy plate with good characteristics of shaping and thermo hardening |
| CN1162341A (en) * | 1994-09-06 | 1997-10-15 | 艾尔坎国际有限公司 | Heat treatment process for aluminum alloy sheet |
| CN1697888A (en) * | 2001-03-28 | 2005-11-16 | 住友轻金属工业株式会社 | Aluminum alloy sheet excellent in formability and hardenability during baking of coating and method for production thereof |
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