CN101407897A - Method for improving baking finish hardenability of AA6022 aluminum alloy sheet - Google Patents
Method for improving baking finish hardenability of AA6022 aluminum alloy sheet Download PDFInfo
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- CN101407897A CN101407897A CNA2008101948415A CN200810194841A CN101407897A CN 101407897 A CN101407897 A CN 101407897A CN A2008101948415 A CNA2008101948415 A CN A2008101948415A CN 200810194841 A CN200810194841 A CN 200810194841A CN 101407897 A CN101407897 A CN 101407897A
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Abstract
The invention provides a method for improving the harden ability of baking paint of AA6022 aluminium alloy plates, which includes the following steps: after solid solution and water quenching, the AA6022 aluminium alloy plates are subjected to preheating treatment in a week with the preheating treatment temperature of 60 to 100 DEG C and preheating treatment time of 30 minutes to 12 hours. The preheat treatment process effectively improves the intensity of the alloy after the paint is baked and further develops the potential of age hardening of the aluminium alloy; simultaneously, the intensity of materials before stamping is lower, which is beneficial for stamping-forming and further causes automobile factories to broadly adopt the aluminium alloy plates to replace steel plates for producing body stamping parts of automobiles.
Description
Technical field
The present invention relates to a kind of thermal pretreatment technology of the AA6022 of improvement aluminum alloy plate materials bake hardening, belong to the aluminum alloy heat processing technology field.
Background technology
Aluminum alloy materials is owing to have specific tenacity height, corrosion-resistant, and shock resistance is good, easily surface colour, and good formability and the high a series of good characteristics of recovery, reproducibility etc. again become the optimal material of automobile lightweight.Because heat-treatable strengthened 6xxx line aluminium alloy has higher intensity under forming property good under the solid solution condition (T4 state) and the baking vanish state (T8 state) simultaneously, be considered to as the most promising alloy of vehicle body plate.
In the production process of aluminium alloy automobile car body panel, owing to transport and store, the sheet material after the solution treatment needed just to carry out punching press and baking vanish processing in trolley part factory after room temperature placement for some time (at least one month).Room temperature is placed the natural aging that is produced, and will cause plate property to descend: on the one hand, natural aging raises the intensity of alloy, and unit elongation descends, and causes the punching out difficulty of bodywork parts, decrease in yield; On the other hand, natural aging has consumed a large amount of solute atoms and rooms in the alloy, and the ageing strengthening effect of alloy is postponed, and the bake hardening ability reduces greatly.This phenomenon has seriously hindered 6xxx line aluminium alloy thin plate in the application of body of a motor car drawing part and the raising of material impact resistance.Thereby the effective way that addresses this problem is to carry out suitable thermal pretreatment technology in material produce factory to reduce or eliminate the disadvantageous effect that natural aging is brought drawing and bake hardening.
But thermal pretreatment needs carrying out immediately or in the extremely short time after the sheet material solution treatment usually, can reach the effect that reduces or eliminate the natural aging disadvantageous effect.Yucel Birol has studied 60～200 ℃ of thermal pretreatment of carrying out 2～30min in AA6016 alloy solid solution quenching 10min inherence, back, carrying out the preageing of 140～180 ℃/10min after the discovery solution hardening in the 10min immediately handles and can improve the baking and hardening performance of material on the basis that does not reduce AA6016 sheet alloy drawing performance.But too short to the transfer time between the preageing processing after the desired solution hardening of this result of study, suitability for industrialized production is difficult to be realized.People such as Guan Shaokang have studied the preageing technology of carrying out 150 ℃/5min after the Al-Mg-Si-Cu alloy solid solution quenches immediately, think that preageing helps improving the baking hardenability of material, this result of study exists transfer time too short equally, the difficult problem that realizes of suitability for industrialized production.People such as Tian Ni have studied after the 6111 sheet alloy solid solution shrends and had placed 2 hours to 5 days under the room temperature, then 180～200 ℃ of pre-treatment of carrying out 7～15 minutes, think and carry out under this technology that the punching performance under the 6111 latten supply of material states and the intensity behind the baking vanish all increase after the thermal pretreatment.This method for warming up is easier to realize at the laboratory ratio.But this method is difficult to solve the heavy bigger problem of the volume that exists in the suitability for industrialized production because the preageing time is too short, be difficult in the sheet material that obtains the performance homogeneous in the so short time, thereby the effect of thermal pretreatment can't finely embody.
Summary of the invention
The objective of the invention is to overcome the deficiency that prior art exists, a kind of method of the AA6022 of improvement aluminum alloy automobile board bake hardening is provided, be intended to effectively solve problems such as intensity is low behind the present AA6022 aluminium alloy automobile plate baking vanish, make sheet material better satisfy the requirement of auto sheet shock resistance.
Purpose of the present invention is achieved through the following technical solutions:
Improve the method for AA6022 aluminum alloy plate materials bake hardening, characteristics are: after AA6022 aluminum alloy plate materials solid solution shrend, carry out thermal pretreatment within the Yu Yizhou, the thermal pretreatment temperature is 60 ℃～100 ℃, and the thermal pretreatment time is 30min～12 hour.
Further, the above-mentioned method of improving AA6022 aluminum alloy plate materials bake hardening, the temperature of described thermal pretreatment are 60 ℃～80 ℃, and the thermal pretreatment time is 6～10 hours.
Substantive distinguishing features and obvious improvement that technical solution of the present invention is outstanding are mainly reflected in:
The temperature of thermal pretreatment process using of the present invention is lower, and the time is shorter, can not expend a large amount of energy, needn't increase facility investment.The more important thing is that AA6022 aluminum alloy plate materials baking hardenability after the inventive method is handled is significantly improved, forming property also makes moderate progress.This helps auto producer and improves the presswork rate, reduce cost of stamping, and under the situation that need not to change existing baking vanish technology, just can further excavate the potentiality of aluminium alloy age hardening, satisfy the shock proof requirement of auto sheet, promote auto producer extensively to adopt aluminum alloy plate materials to replace steel plate to reach the light-weighted purpose of automobile; Satisfied realization energy-saving and emission-reduction have produced very significant social economic benefit, simple and easy being suitable for, and market outlook are wide.
Embodiment
Intensity is lower after the present invention is directed to the 6xxx line aluminium alloy auto sheet baking vanish that has low content of Cu now, is difficult to satisfy the requirement of auto sheet to shock resistance, proposes a kind of method of improving the AA6022 aluminium alloy automobile plate bake hardening of low content of Cu.Be research object promptly with the best AA6022 latten of forming property in the 6xxx line aluminium alloy that is applied to produce vehicle body plate, the quality percentage composition of AA6022 alloying constituent is: Si 0.8～1.5%, Mg 0.45～0.7%, Cu 0.01～0.11%, Mn 0.02～0.1%, and Fe 0.05～0.2%, and Cr 0～0.1%, Zn 0～0.25%, and all the other components are Al.
The method that the present invention improves AA6022 aluminium alloy baking hardenability is after the solution hardening of AA6022 aluminum alloy plate materials, carries out before the drawing.In systematic study AA6022 Aluminium Alloy Plate microstructure evolution rule in the solution treatment process, natural aging and in different preheating treatment procedures GP district, β " etc. the separating out on dynamic (dynamical) basis of strengthening phase; by research; the optimization optimum treatment process is: after the solution hardening of AA6022 Aluminium Alloy Plate handled; park within the week under the room temperature; carry out thermal pretreatment then, 60～100 ℃ of treatment temps, treatment time 30min～12h to multiple thermal pretreatment system.Ideal thermal pretreatment temperature is 60 ℃～80 ℃, and the treatment time is 6～10 hours.
Owing to after method of the present invention only needs aluminium sheet factory with the aluminum alloy plate materials solution treatment, in a week, carry out a thermal treatment again.Technologically be easy at the scene the transfer time in 0～one week realize, (60～100 ℃/30min～12h) thermal treatment process is easy to implement on existing aluminium alloy production line, operational safety, control make things convenient for and make plate property even easily, give full play to the improvement of thermal pretreatment technology to plate property.
The temperature of thermal pretreatment process using is lower, and the time is shorter, can not expend a large amount of energy, needn't increase facility investment.The more important thing is that AA6022 aluminum alloy plate materials baking hardenability after the inventive method is handled is significantly improved, forming property also makes moderate progress.This helps auto producer and improves the presswork rate, reduce cost of stamping, and under the situation that need not to change existing baking vanish technology, just can further excavate the potentiality of aluminium alloy age hardening, satisfy the shock proof requirement of auto sheet, promote auto producer extensively to adopt aluminum alloy plate materials to replace steel plate to reach the light-weighted purpose of automobile.
Below in conjunction with embodiment processing method of the present invention is further specified.
Embodiment 1
Alloying constituent is the AA6022 aluminium alloy cast ingot of Al for 1.25%Si, 0.48%Mg, 0.02%Cu, 0.1%Mn, 0.12%Fe, 0.1%Cr, 0.25%Zn, 0.15%Ti, surplus by percentage to the quality, after 480 ℃ * 8h+550 ℃ * 12h homogenizing was handled, crop milled face, hot rolling and is cold-rolled to the thin plate of 1mm at last in the circulation wind furnace; Thin plate through 550 ℃ * 1h solution treatment after shrend, after room temperature is parked 10h, carry out the thermal treatment of 75 ℃ * 8h in the circulation wind furnace, at room temperature park after 1 month and stretch and drawing test, the baking vanish heat treated of 175 ℃ * 30min of simulation is carried out in oil bath furnace.
Embodiment 2
Alloying constituent is the AA6022 aluminium alloy cast ingot of Al for 1.25%Si, 0.48%Mg, 0.02%Cu, 0.1%Mn, 0.12%Fe, 0.1%Cr, 0.25%Zn, 0.15%Ti, surplus by percentage to the quality, after 480 ℃ * 8h+550 ℃ * 12h homogenizing was handled, crop milled face, hot rolling and is cold-rolled to the thin plate of 1mm at last in the circulation wind furnace; Thin plate through 550 ℃ * 1h solution treatment after after the shrend, in the circulation wind furnace, carry out the thermal treatment of 70 ℃ of x30min immediately, at room temperature park after 1 month and stretch and drawing test, the baking vanish heat treated of 175 ℃ * 30min of simulation is carried out in oil bath furnace.
Embodiment 3
Alloying constituent is the AA6022 aluminium alloy cast ingot of Al for 1.25%Si, 0.48%Mg, 0.02%Cu, 0.1%Mn, 0.12%Fe, 0.1%Cr, 0.25%Zn, 0.15%Ti, surplus by percentage to the quality, after 480 ℃ * 8h+550 ℃ * 12h homogenizing was handled, crop milled face, hot rolling and is cold-rolled to the thin plate of 1mm at last in the circulation wind furnace; Thin plate through 550 ℃ * 1h solution treatment after shrend, after room temperature is parked 3 days, carry out the thermal treatment of 100 ℃ * 6h in the circulation wind furnace, at room temperature park after 1 month and stretch and drawing test, the baking vanish heat treated of 175 ℃ * 30min of simulation is carried out in oil bath furnace.
Embodiment 4
Alloying constituent is the AA6022 aluminium alloy cast ingot of Al for 1.25%Si, 0.48%Mg, 0.02%Cu, 0.1%Mn, 0.12%Fe, 0.1%Cr, 0.25%Zn, 0.15%Ti, surplus by percentage to the quality, after 480 ℃ * 8h+550 ℃ * 12h homogenizing was handled, crop milled face, hot rolling and is cold-rolled to the thin plate of 1mm at last in the circulation wind furnace; Thin plate through 550 ℃ * 1h solution treatment after shrend, after room temperature is parked a week, carry out the thermal treatment of 60 ℃ * 12h in the circulation wind furnace, at room temperature park after 1 month and stretch and drawing test, the baking vanish heat treated of 175 ℃ * 30min of simulation is carried out in oil bath furnace.
Embodiment 5
Alloying constituent is the AA6022 aluminium alloy cast ingot of Al for 1.0%Si, 0.55%Mg, 0.1%Cu, 0.02%Mn, 0.14%Fe, 0.1%Cr, 0.10%Zn, 0.10%Ti, surplus by percentage to the quality, after 480 ℃ * 8h+550 ℃ * 12h homogenizing was handled, crop milled face, hot rolling and is cold-rolled to the thin plate of 1mm at last in the circulation wind furnace; Thin plate through 550 ℃ * 1h solution treatment after shrend, after room temperature is parked 12h, carry out the thermal treatment of 75 ℃ * 8h in the circulation wind furnace, at room temperature park after 1 month and stretch and drawing test, the baking vanish heat treated of 175 ℃ * 30min of simulation is carried out in oil bath furnace.
Embodiment 6
Alloying constituent is the AA6022 aluminium alloy cast ingot of Al for 1.0%Si, 0.55%Mg, 0.1%Cu, 0.02%Mn, 0.14%Fe, 0.1%Cr, 0.10%Zn, 0.10%Ti, surplus by percentage to the quality, after 480 ℃ * 8h+550 ℃ * 12h homogenizing was handled, crop milled face, hot rolling and is cold-rolled to the thin plate of 1mm at last in the circulation wind furnace; Thin plate through 550 ℃ * 1h solution treatment after shrend, after room temperature is parked 3 days, carry out the thermal treatment of 80 ℃ * 10h in the circulation wind furnace, at room temperature park after 1 month and stretch and drawing test, the baking vanish heat treated of 175 ℃ * 30min of simulation is carried out in oil bath furnace.
Embodiment 7
Alloying constituent is the AA6022 aluminium alloy cast ingot of Al for 1.0%Si, 0.55%Mg, 0.1%Cu, 0.02%Mn, 0.14%Fe, 0.1%Cr, 0.10%Zn, 0.10%Ti, surplus by percentage to the quality, after 480 ℃ * 8h+550 ℃ * 12h homogenizing was handled, crop milled face, hot rolling and is cold-rolled to the thin plate of 1mm at last in the circulation wind furnace; Thin plate through 550 ℃ * 1h solution treatment after shrend, after room temperature is parked a week, carry out the thermal treatment of 100 ℃ * 6h in the circulation wind furnace, at room temperature park after 1 month and stretch and drawing test, the baking vanish heat treated of 175 ℃ * 30min of simulation is carried out in oil bath furnace.
Embodiment 8
Alloying constituent is the AA6022 aluminium alloy cast ingot of Al for 1.4%Si, 0.65%Mg, 0.06%Cu, 0.06%Mn, 0.20%Fe, 0.1%Cr, 0.20%Zn, 0.10%Ti, surplus by percentage to the quality, after 480 ℃ * 8h+550 ℃ * 12h homogenizing was handled, crop milled face, hot rolling and is cold-rolled to the thin plate of 1mm at last in the circulation wind furnace; Thin plate through 550 ℃ * 1h solution treatment after shrend, after room temperature is parked 2h, carry out the thermal treatment of 65 ℃ * 1h in the circulation wind furnace, at room temperature park after 1 month and stretch and drawing test, the baking vanish heat treated of 175 ℃ * 30min of simulation is carried out in oil bath furnace.
Embodiment 9
Alloying constituent is the AA6022 aluminium alloy cast ingot of Al for 1.4%Si, 0.65%Mg, 0.06%Cu, 0.06%Mn, 0.20%Fe, 0.1%Cr, 0.20%Zn, 0.10%Ti, surplus by percentage to the quality, after 480 ℃ * 8h+550 ℃ * 12h homogenizing was handled, crop milled face, hot rolling and is cold-rolled to the thin plate of 1mm at last in the circulation wind furnace; Thin plate through 550 ℃ * 1h solution treatment after shrend, after room temperature is parked 2 days, carry out the thermal treatment of 70 ℃ * 8h in the circulation wind furnace, at room temperature park after 1 month and stretch and drawing test, the baking vanish heat treated of 175 ℃ * 30min of simulation is carried out in oil bath furnace.
Embodiment 10
Alloying constituent is the AA6022 aluminium alloy cast ingot of Al for 1.4%Si, 0.65%Mg, 0.06%Cu, 0.06%Mn, 0.20%Fe, 0.1%Cr, 0.20%Zn, 0.10%Ti, surplus by percentage to the quality, after 480 ℃ * 8h+550 ℃ * 12h homogenizing was handled, crop milled face, hot rolling and is cold-rolled to the thin plate of 1mm at last in the circulation wind furnace; Thin plate through 550 ℃ * 1h solution treatment after shrend, after room temperature is parked 24h, carry out the thermal treatment of 75 ℃ * 6h in the circulation wind furnace, at room temperature park after 1 month and stretch and drawing test, the baking vanish heat treated of 175 ℃ * 30min of simulation is carried out in oil bath furnace.
Comparative example
Alloying constituent is the AA6022 aluminium alloy cast ingot of Al for 1.4%Si, 0.65%Mg, 0.06%Cu, 0.06%Mn, 0.20%Fe, 0.1%Cr, 0.20%Zn, 0.10%Ti, surplus by percentage to the quality, after 480 ℃ * 8h+550 ℃ * 12h homogenizing was handled, crop milled face, hot rolling and is cold-rolled to the thin plate of 1mm at last in the circulation wind furnace; Thin plate through 550 ℃ * 1h solution treatment after shrend, at room temperature park after 1 month and stretch and drawing test, the baking vanish heat treated of 175 ℃ * 30min of simulation is carried out in oil bath furnace.
Performance index and comparative example performance after the foregoing description 1～10 handled AA6022 Aluminium Alloy Plate supply of material state performance index and baking vanish are handled compare, and see Table 1 in detail.
Table 1
By table 1 as seen, punching performance is good under 6022 latten supply of material states after the art breading of the present invention, and the intensity behind the baking vanish all is significantly improved.
Show that to sum up thermal treatment process of the present invention can effectively improve the intensity behind the AA6022 alloy baking vanish, help further excavating the potentiality of aluminium alloy age hardening; The intensity of material is lower before the punching press simultaneously, help drawing, promote auto producer extensively to adopt aluminum alloy plate materials to substitute steel plate better and produce the body of a motor car stamping parts, the purpose of satisfied realization energy-saving and emission-reduction, produce very significant social economic benefit, be worth in the field of business applying.
What need understand is: above-mentioned explanation is not to be limitation of the present invention, and in the present invention conceived scope, the interpolation of being carried out, conversion, replacement etc. also should belong to protection scope of the present invention.
Claims (3)
1. improve the method for AA6022 aluminum alloy plate materials bake hardening, it is characterized in that: after AA6022 aluminum alloy plate materials solid solution shrend, carry out thermal pretreatment within the Yu Yizhou, the thermal pretreatment temperature is 60 ℃～100 ℃, and the thermal pretreatment time is 30min～12 hour.
2. the method for improving AA6022 aluminum alloy plate materials bake hardening according to claim 1 is characterized in that: the temperature of described thermal pretreatment is 60 ℃～80 ℃, and the thermal pretreatment time is 6～10 hours.
3. the method for improving AA6022 aluminum alloy plate materials bake hardening according to claim 1, it is characterized in that: with the AA6022 aluminium alloy cast ingot in the circulation wind furnace after 480 ℃ * 8h+550 ℃ * 12h homogenizing is handled, crop mills face, hot rolling and is cold-rolled to thin plate; Thin plate through 550 ℃ * 1h solution treatment after shrend, after room temperature is parked 24h, in the circulation wind furnace, carry out the thermal pretreatment of 75 ℃ * 6h.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101935785A (en) * | 2010-09-17 | 2011-01-05 | 中色科技股份有限公司 | Aluminium alloy with high forming property for automobile body plate |
| CN102553799A (en) * | 2010-12-14 | 2012-07-11 | 张家港市华杨金属制品有限公司 | Production process for improving varnishability of aluminum profile |
| CN108193095A (en) * | 2018-03-06 | 2018-06-22 | 东北大学 | A kind of preparation method of 6022 aluminum alloy plate materials of body of a motor car |
| CN108588597A (en) * | 2018-05-09 | 2018-09-28 | 中南大学 | A kind of cycle heat treatment method improving aluminium alloy automobile plate baking vanish performance |
| CN112195376A (en) * | 2020-09-11 | 2021-01-08 | 中铝材料应用研究院有限公司 | 6xxx series aluminum alloy plate for high-strength automobile body and preparation method thereof |
| CN112410626A (en) * | 2020-10-30 | 2021-02-26 | 辽宁忠旺集团有限公司 | Aluminum material for building template and preparation method thereof |
-
2008
- 2008-10-22 CN CN2008101948415A patent/CN101407897B/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101935785A (en) * | 2010-09-17 | 2011-01-05 | 中色科技股份有限公司 | Aluminium alloy with high forming property for automobile body plate |
| CN101935785B (en) * | 2010-09-17 | 2012-03-28 | 中色科技股份有限公司 | Aluminium alloy with high forming property for automobile body plate |
| CN102553799A (en) * | 2010-12-14 | 2012-07-11 | 张家港市华杨金属制品有限公司 | Production process for improving varnishability of aluminum profile |
| CN108193095A (en) * | 2018-03-06 | 2018-06-22 | 东北大学 | A kind of preparation method of 6022 aluminum alloy plate materials of body of a motor car |
| CN108588597A (en) * | 2018-05-09 | 2018-09-28 | 中南大学 | A kind of cycle heat treatment method improving aluminium alloy automobile plate baking vanish performance |
| 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 |
| CN112195376A (en) * | 2020-09-11 | 2021-01-08 | 中铝材料应用研究院有限公司 | 6xxx series aluminum alloy plate for high-strength automobile body and preparation method thereof |
| CN112410626A (en) * | 2020-10-30 | 2021-02-26 | 辽宁忠旺集团有限公司 | Aluminum material for building template and preparation method thereof |
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