CN108193095A

CN108193095A - A kind of preparation method of 6022 aluminum alloy plate materials of body of a motor car

Info

Publication number: CN108193095A
Application number: CN201810182424.2A
Authority: CN
Inventors: 田妮; 刘启隆; 袁飞; 赵紫研; 赵刚; 秦高梧; 左良
Original assignee: Northeastern University China
Current assignee: Northeastern University China
Priority date: 2018-03-06
Filing date: 2018-03-06
Publication date: 2018-06-22

Abstract

A kind of body of a motor car preparation method of 6022 aluminum alloy plate materials, includes the following steps：(1) 6022 aluminium alloy cast ingots are prepared；(2) 450~500 DEG C are heated to and keeps the temperature hot rolling after 2~4h；(3) after being heated to 460~550 DEG C of 2~6h of heat preservation, furnace cooling；(4) cold rolling obtains cold-reduced sheet；(5) solution treatment is carried out；(6) it is placed at room temperature for 5~20min；(7) Pre-aging treatment；(8) 4 weeks or more are placed at room temperature for.The present invention method can significantly shorten 6022 aluminum alloy plate materials production procedure, it is energy saving, production cost is greatly lowered and the press formability and baking hardenability of sheet alloy can be improved simultaneously.

Description

A kind of preparation method of 6022 aluminum alloy plate materials of body of a motor car

Technical field

The invention belongs to Aluminum alloy for automotive body board technology fields, and in particular to a kind of body of a motor car is closed with 6022 aluminium The preparation method of golden plate material.

Background technology

The energy, is the three big subjects that current auto industry faces safely at environmental protection, and body of a motor car accounts for about automobile gross weight 30%, car inner plate aluminium alloy, which substitutes steel plate, can substantially mitigate automobile gross weight, bear equally to impact, aluminium sheet absorbs more than steel plate Impact energy 50%；Therefore, aluminium alloy becomes the preferred material of automotive light weight technology, becomes major automaker's focus of attention.

Heat-treatable strengthened 6xxx line aluminium alloys have good comprehensive mechanical property and forming property and become manufacture One of optional material of auto body sheet；Past attempts be used for produce body of a motor car aluminium sheet type mainly have 6009-T4P, 6010-T4P, 6111-T4P, 6016-T4P, 6022-T4P etc.；Wherein 6022 alloys contain relatively low alloying element, have than The better formability of 6016,6111 alloys and corrosion resistance are considered not only doing plate material outside vehicle body but also can do inner panel Material has been widely used in automobile industry in North America；However, 6022 aluminum alloy plate materials of vehicle body prepared using traditional handicraft Production cost is significantly larger than conventional automobile bodies steel plate, and its deep drawability also has certain gap compared with low carbon steel plate, this is serious Hinder automotive light weight technology process.Therefore, how further to improve the deep drawability of 6022 aluminum alloy plate materials, significantly reduce simultaneously Car body of aluminum alloy sheet fabrication cost is imperative.

Invention content

Present invention aims at a kind of preparation method of 6022 aluminum alloy plate materials of body of a motor car is provided, in traditional preparation side Homogenization Treatments technique is omitted on the basis of method, directly carries out hot rolling, shortens the production procedure of 6022 aluminum alloy plate materials, save energy Production cost is greatly lowered in source.

The method of the present invention includes the following steps：

(1) prepared by ingot casting：Prepare 6022 aluminium alloy cast ingots；

(2) hot rolling：6022 aluminium alloy cast ingots are heated to 450~500 DEG C, keep the temperature hot rolling after 2~4h, hot rolled plate is made；

(3) intermediate annealing：Hot rolled plate is heated to 460~550 DEG C, after keeping the temperature 2~6h, cools to room temperature with the furnace, is obtained Annealed state rolls plate；

(4) cold rolling：Annealed state is rolled into plate cold rolling and obtains cold-reduced sheet；

(5) solution treatment：Solution treatment is carried out to cold-reduced sheet, rolls plate after forming solution treatment；The temperature of solution treatment is 535~550 DEG C, the time is 10~15min, and the type of cooling is water quenching to room temperature；

(6) it is placed at room temperature for：5~20min is placed at room temperature for rolling plate after solution treatment；

(7) Pre-aging treatment：Pre-aging treatment is carried out to rolling plate after being placed at room temperature for, rolls plate after forming Pre-aging treatment；Its Middle pre-ageing treatment temperature is 160~190 DEG C, and the time is 5~10min, and the type of cooling is is air-cooled to room temperature；

(8) it is placed at room temperature for：4 weeks or more are placed at room temperature for rolling plate after Pre-aging treatment, as T4P states, body of a motor car is made With 6022 aluminum alloy plate materials.

In the step (1), the ingredient of 6022 aluminium alloy cast ingots is by mass percentage：Si：0.80~1.10%, Mg：0.45~0.70%, Cu≤0.11%, Mn≤0.10%, Fe≤0.20%, Zn≤0.25%, Cr≤0.10%, Ti≤ 0.15%, impurity element≤0.15%, surplus Al.

6022 above-mentioned aluminium alloy cast ingot thickness be 150mm, the hot rolling plate thickness be 4~6mm, the cold-reduced sheet Thickness is 0.8~1.2mm.

In the step (1), 6022 aluminium alloy cast ingots are made using semi-continuous casting (DC castings).

In the step (2), 6022 aluminium alloy cast ingots before heating, through cropping milling surface treatment.

The hot rolling mode is combined for cross rolling with longitudinally rolling, and course of hot rolling is first rolled along ingot casting width direction 2~5 passages are made, 10~16 passages is rolled then along slab ingot length direction, obtains hot rolled plate.

The body of a motor car is with the performance indicator of 6022 aluminum alloy plate materials：σ_0.2=130~137MPa, σ_b=241~ 250MPa, r₁₅=0.60~0.73, n (strain hardening exponent)=0.24~0.29, δ=26.0~27.3%, I_E=7.61~ 8.05mm。

The body of a motor car is with the performance indicator after the paint baking of 6022 aluminum alloy plate materials：σ_0.2=200~ 212MPa, σ_b=270~283MPa, δ=22.6~23.9%.

The traditional preparation methods of 6022 aluminum alloy plate materials materials are usually all semi-continuous casting (Direct Chill Casting DC is cast) → Homogenization Treatments → hot rolling → intermediate annealing → cold rolling → solution treatment → preageing, wherein 6022 aluminium alloys are cast Generally above 530 DEG C of ingot Homogenization Treatments temperature, soaking time is more than 12h, not only time-consuming energy consumption, and seriously reduce life Efficiency is produced, improves production cost；It is worth noting that mainly the crystalline phase containing AlMnFeSi occurs during Homogenization Treatments It is partly dissolved, shrinks, assembling nodularization, this big blocky superfluous crystalline phase is broken and is in along deformation direction during deformation after unloading Broken chainlike distribution, this surplus crystalline phase shape of particle and distribution can deteriorate the stamping formabilily of plank；If using without Homogenize the direct hot rolling of processing, crystalline phase is broken under big deformation condition and tiny, disperse be distributed in matrix；Pass through improvement Intermediate annealing process so that solvable phased soln, broken crystalline phase nodularization are conducive to improve the plasticity and forming property of plank； Therefore the technique for changing intermediate annealing using the direct hot rolling of no Homogenization Treatments can significantly reduce cost, energy saving, shortening Production cycle, while the research work for optimizing sheet material forming performance has stronger innovative and very strong scientific meaning and reality Application value；The study found that by slab of 6022 aluminium alloy cast ingot of semi-continuous casting without the direct hot rolling of uniform treatment, then through 420 DEG C or so conventional intermediate annealing process, then cold rolling, solid solution, Pre-aging treatment are prepared again plank has the good baking hard Change property but formability it is still not fully up to expectations；Deep study and analysis is found, although can obtain surplus without the direct hot rolling of uniform treatment 6022 aluminium sheets of crystalline phase particle fine uniform Dispersed precipitate, but since intermediate anneal temperature is relatively low, annealing soaking time compared with It is short, solvable phase is caused to be difficult in follow-up conventional solid solution processing procedure during complete back dissolving enters matrix, more important is insoluble mistakes Surplus crystalline phase particle still has obvious wedge angle after the processing of conventional intermediate annealing process, fails to apparent nodularization, this is 6022 aluminum alloy plate materials prepared without Homogenization Treatments technique used at present is caused to fail to obtain the key of excellent deep drawability Problem；Further innovation experiment, continuous analysis and summary experimental result update experimental program, and the present invention proposes to break through conventional intermediate Annealing temperature combines the inventive concept that annealing soaking time is appropriately extended, and develops novel low-cost and prepares high deep drawing quality and height 6022 aluminium sheet fabricating technology of baking hardenability.

The method of the present invention omits Homogenization Treatments technique, and improve intermediate annealing system on the basis of traditional preparation methods Degree；Alloy cast ingot by Homogenization Treatments, does not carry out hot rolling directly, and crystalline phase is distributed in matrix to small and dispersed by after grating In；It is appropriate simultaneously that intermediate anneal temperature is further improved on the basis of conventional intermediate annealing process (420~440 DEG C, 1~2h) Extend intermediate annealing soaking time, the dissolving for making solvable crystalline phase is more abundant, and nodularization occurs for the crystalline phase of tiny fragmentation, can carry The press formability of high 6022 aluminum alloy plate materials；6022 automobile boards prepared after through cold rolling, solid solution water quenching, Pre-aging treatment Deep drawability and baking and hardening performance are superior to the plank of traditional handicraft preparation；This method can shorten 6022 aluminum alloy plate materials Production procedure, it is energy saving, production cost is greatly lowered, and the press formability of sheet alloy can be significantly improved.

Compared with prior art, the advantage of the invention is that：Plank is prepared using no Homogenization Treatments, it is energy saving, it carries High efficiency reduces production cost；It can implement on existing aluminium alloy production line, without changing existing tooling, it is not necessary to increase Equipment and technology investment, it is simple to operate feasible；Proper extension annealing soaking time is combined by improving intermediate anneal temperature, Make solvable crystallization phased soln, superfluous crystalline phase particle edges are round and smooth, nodularization, and 6022 aluminum alloy plate materials are improved simultaneously so as to final Press formability and baking vanish hardenability.Realize the deep-draw that plank is improved while 6022 aluminum alloy plate materials cost is reduced Performance and baking and hardening performance, the economic results in society brought therefrom are considerable.

Description of the drawings

Fig. 1 is that the optical microstructure of 6022 aluminum alloy plate materials made from the embodiment of the present invention 1 schemes；

Fig. 2 is that the optical microstructure of 6022 aluminum alloy plate materials made from comparative example 1 of the present invention schemes.

Specific embodiment

With reference to embodiment, the present invention is described in further detail.

6022 aluminum alloy plate materials of body of a motor car prepared by the embodiment of the present invention 1~26 and comparative example 1, performance indicator with Performance indicator after paint baking is shown in Table 1.

The performance after 6022 aluminum alloy plate materials supply of material state performance index and paint baking is made in 1 embodiment and comparative example of table Index

There is good forming property by 6022 aluminum alloy plate materials that the 1 visible present invention of table prepares, through simulating baking vanish Show good baking hardenability afterwards, hence it is evident that better than comparative example 1 by 6022 conventionally produced aluminum alloy plate materials into Shape index and baking vanish hardenability index.

It is GB/T228-2002 that tension test accepted standard is carried out in the embodiment of the present invention and comparative example 1《Metal material Tensile testing at ambient temperature》.

It is GB/T4156-2007 that cupping test accepted standard is carried out in the embodiment of the present invention and comparative example 1《Metal cupping Experimental method》.

Paint baking in the embodiment of the present invention 1~26 be after 2% predeformation, then in drying box carry out 170 DEG C × The simulation baking vanish heat treatment of 30min, then measures its intensity.

Paint baking in comparative example 1 of the present invention be after 2% predeformation, then in drying box carry out 170 DEG C × 30min Simulation baking vanish heat treatment, then measure its intensity.

6022 aluminium alloy cast ingots are made using direct water-cooling semi-continuous casting (DC castings) in the embodiment of the present invention and comparative example 1 .

In the embodiment of the present invention and comparative example 1 6022 aluminium alloy cast ingots before heating, through cropping milling surface treatment.

Hot rolling mode in the embodiment of the present invention and comparative example 1 is combined for cross rolling with longitudinally rolling, course of hot rolling 2~5 passages first are rolled along ingot casting width direction, 10~16 passages is rolled then along slab ingot length direction, obtains hot rolled plate Material.

The equipment that solution treatment and Pre-aging treatment use in the embodiment of the present invention and comparative example is resistance furnace.

Embodiment 1

A kind of preparation method of 6022 aluminum alloy plate materials, includes the following steps：

(1) prepared by ingot casting：6022 aluminium alloy cast ingots are prepared using semi-continuous casting；

(2) hot rolling：After 6022 aluminium alloy cast ingots are cut off milling surface treatment, 450 DEG C are heated in wind furnace is recycled, keeps the temperature 2h Hot rolling afterwards, hot rolling mode is first rolls 4 passages along rectangle ingot width direction, then along rectangle ingot length direction rolling 11 It is secondary, it is rolled into the hot rolled plate that thickness is 4mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 460 DEG C are heated in wind furnace is recycled, after keeping the temperature 2h, is furnace-cooled to Room temperature obtains annealed state and rolls plate；

(4) cold rolling：Annealed state is rolled into plate and carries out cold rolling, cold-reduced sheet is made；Wherein, Cold Rolled Plate Thickness 1.0mm；

(5) solution treatment：Solution treatment is carried out in salt bath furnace to cold-reduced sheet, the heating temperature of solution treatment is 540 DEG C, Soaking time is 12min, and the type of cooling is water quenching to room temperature, rolls plate after forming solution treatment；

(6) it is placed at room temperature for：18min is placed at room temperature for rolling plate after solution treatment；

(7) Pre-aging treatment：To rolling plate, progress Pre-aging treatment after being placed at room temperature for, pre-ageing treatment temperature is 165 DEG C, The Pre-aging treatment time is 8min, and the type of cooling forms after Pre-aging treatment to be air-cooled to room temperature and rolls plate；

(8) it is placed at room temperature for：Plate will be rolled after Pre-aging treatment, be placed at room temperature for 4 weeks or more, as T4P states, 6022- is made T4P aluminum alloy plate materials, optical microstructure are as shown in Figure 1；

6022 aluminum alloy plate materials made from the present embodiment are stretched and cupping test, and to made from the present embodiment 6022 aluminum alloy plate materials are after 2% predeformation, then the simulation baking vanish of 170 DEG C × 30min of progress heats in drying box, with After measure its intensity；Related performance indicators data are shown in Table 1.

Comparative example 1

(2) it homogenizes：6022 aluminium alloy cast ingots are fitted into cycle wind furnace, are warming up to 545 DEG C of heat preservations with stove within 2.5 hours After for 24 hours, come out of the stove and be air-cooled to room temperature；

(3) hot rolling：After 6022 aluminium alloy cast ingot after cooling is cut off milling surface treatment, 455 DEG C are heated to, keeps the temperature heat after 4h It rolls, hot rolling system rolls 16 passages first to roll 4 passages along rectangle ingot width direction, then along rectangle ingot length direction, It is rolled into the hot rolled plate that thickness is 5mm；

(4) intermediate annealing：After hot rolled plate is cut scale, 430 DEG C are heated in wind furnace is recycled, after keeping the temperature 1h, is furnace-cooled to Room temperature obtains annealed state and rolls plate；

(5) cold rolling：Annealed state is rolled into plate and carries out cold rolling, cold-reduced sheet is made；Wherein, Cold Rolled Plate Thickness 1.0mm；

(6) solution treatment：Solution treatment is carried out in salt bath furnace to cold-reduced sheet, the heating temperature of solution treatment is 540 DEG C, Soaking time is 12min, and the type of cooling is water quenching to room temperature, rolls plate after forming solution treatment；

(7) it is placed at room temperature for：15min is placed at room temperature for rolling plate after solution treatment；

(8) Pre-aging treatment：To rolling plate, progress Pre-aging treatment after being placed at room temperature for, pre-ageing treatment temperature is 165 DEG C, The Pre-aging treatment time is 8min, and the type of cooling forms after Pre-aging treatment to be air-cooled to room temperature and rolls plate；

(9) it is placed at room temperature for：Plate will be rolled after Pre-aging treatment, be placed at room temperature for 4 weeks or more, as T4P states, 6022- is made T4P aluminum alloy plate materials, optical microstructure are as shown in Figure 2；

6022 aluminum alloy plate materials made from this comparative example are stretched and cupping test, and to made from this comparative example 6022 aluminum alloy plate materials are after 2% predeformation, then the simulation baking vanish of 170 DEG C × 30min of progress heats in drying box, with After measure its intensity；Related performance indicators data are shown in Table 1.

Embodiment 2

(2) hot rolling：After 6022 aluminium alloy cast ingots are cut off milling surface treatment, 490 DEG C are heated in wind furnace is recycled, keeps the temperature 2h Hot rolling afterwards, hot rolling mode is first rolls 3 passages along rectangle ingot width direction, then along rectangle ingot length direction rolling 12 It is secondary, it is rolled into the hot rolled plate that thickness is 4.5mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 460 DEG C are heated in wind furnace is recycled, after keeping the temperature 5h, is furnace-cooled to Room temperature obtains annealed state and rolls plate；

(4) cold rolling：Annealed state is rolled into plate and carries out cold rolling, cold-reduced sheet is made；Wherein, Cold Rolled Plate Thickness 0.8mm；

(5) solution treatment：Solution treatment is carried out in salt bath furnace to cold-reduced sheet, the heating temperature of solution treatment is 535 DEG C, Soaking time is 12min, and the type of cooling is water quenching to room temperature, rolls plate after forming solution treatment；

(6) it is placed at room temperature for：8min is placed at room temperature for rolling plate after solution treatment；

(7) Pre-aging treatment：To rolling plate, progress Pre-aging treatment after being placed at room temperature for, pre-ageing treatment temperature is 190 DEG C, The Pre-aging treatment time is 8min, and the type of cooling forms after Pre-aging treatment to be air-cooled to room temperature and rolls plate；

(8) it is placed at room temperature for：Plate will be rolled after Pre-aging treatment, be placed at room temperature for 4 weeks or more, as T4P states, 6022- is made T4P aluminum alloy plate materials；

Embodiment 3

(2) hot rolling：After 6022 aluminium alloy cast ingots are cut off milling surface treatment, 460 DEG C are heated in wind furnace is recycled, keeps the temperature 3h Hot rolling afterwards, hot rolling mode is first rolls 4 passages along rectangle ingot width direction, then along rectangle ingot length direction rolling 12 It is secondary, it is rolled into the hot rolled plate that thickness is 5mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 465 DEG C are heated in wind furnace is recycled, after keeping the temperature 3h, is furnace-cooled to Room temperature obtains annealed state and rolls plate；

(4) cold rolling：Annealed state is rolled into plate and carries out cold rolling, cold-reduced sheet is made；Wherein, Cold Rolled Plate Thickness 0.9mm；

(5) solution treatment：Solution treatment is carried out in salt bath furnace to cold-reduced sheet, the heating temperature of solution treatment is 535 DEG C, Soaking time is 15min, and the type of cooling is water quenching to room temperature, rolls plate after forming solution treatment；

(6) it is placed at room temperature for：20min is placed at room temperature for rolling plate after solution treatment；

(7) Pre-aging treatment：To rolling plate, progress Pre-aging treatment after being placed at room temperature for, pre-ageing treatment temperature is 190 DEG C, The Pre-aging treatment time is 5min, and the type of cooling forms after Pre-aging treatment to be air-cooled to room temperature and rolls plate；

Embodiment 4

(2) hot rolling：After 6022 aluminium alloy cast ingots are cut off milling surface treatment, 480 DEG C are heated in wind furnace is recycled, keeps the temperature 4h Hot rolling afterwards, hot rolling mode is first rolls 3 passages along rectangle ingot width direction, then along rectangle ingot length direction rolling 13 It is secondary, it is rolled into the hot rolled plate that thickness is 6mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 465 DEG C are heated in wind furnace is recycled, after keeping the temperature 5h, is furnace-cooled to Room temperature obtains annealed state and rolls plate；

(4) cold rolling：Annealed state is rolled into plate and carries out cold rolling, cold-reduced sheet is made；Wherein, Cold Rolled Plate Thickness 1.1mm；

(5) solution treatment：Solution treatment is carried out in salt bath furnace to cold-reduced sheet, the heating temperature of solution treatment is 550 DEG C, Soaking time is 15min, and the type of cooling is water quenching to room temperature, rolls plate after forming solution treatment；

(6) it is placed at room temperature for：15min is placed at room temperature for rolling plate after solution treatment；

(7) Pre-aging treatment：To rolling plate, progress Pre-aging treatment after being placed at room temperature for, pre-ageing treatment temperature is 170 DEG C, The Pre-aging treatment time is 5min, and the type of cooling forms after Pre-aging treatment to be air-cooled to room temperature and rolls plate；

Embodiment 5

(2) hot rolling：After 6022 aluminium alloy cast ingots are cut off milling surface treatment, 490 DEG C are heated in wind furnace is recycled, keeps the temperature 3h Hot rolling afterwards, hot rolling mode is first rolls 4 passages along rectangle ingot width direction, then along rectangle ingot length direction rolling 12 It is secondary, it is rolled into the hot rolled plate that thickness is 4mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 470 DEG C are heated in wind furnace is recycled, after keeping the temperature 4h, is furnace-cooled to Room temperature obtains annealed state and rolls plate；

(5) solution treatment：Solution treatment is carried out in salt bath furnace to cold-reduced sheet, the heating temperature of solution treatment is 535 DEG C, Soaking time is 10min, and the type of cooling is water quenching to room temperature, rolls plate after forming solution treatment；

(7) Pre-aging treatment：To rolling plate, progress Pre-aging treatment after being placed at room temperature for, pre-ageing treatment temperature is 160 DEG C, The Pre-aging treatment time is 6min, and the type of cooling forms after Pre-aging treatment to be air-cooled to room temperature and rolls plate；

Embodiment 6

(2) hot rolling：After 6022 aluminium alloy cast ingots are cut off milling surface treatment, 500 DEG C are heated in wind furnace is recycled, keeps the temperature 2h Hot rolling afterwards, hot rolling mode is first rolls 2 passages along rectangle ingot width direction, then along rectangle ingot length direction rolling 14 It is secondary, it is rolled into the hot rolled plate that thickness is 4mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 470 DEG C are heated in wind furnace is recycled, after keeping the temperature 6h, is furnace-cooled to Room temperature obtains annealed state and rolls plate；

(6) it is placed at room temperature for：10min is placed at room temperature for rolling plate after solution treatment；

(7) Pre-aging treatment：To rolling plate, progress Pre-aging treatment after being placed at room temperature for, pre-ageing treatment temperature is 170 DEG C, The Pre-aging treatment time is 7min, and the type of cooling forms after Pre-aging treatment to be air-cooled to room temperature and rolls plate；

Embodiment 7

(2) hot rolling：After 6022 aluminium alloy cast ingots are cut off milling surface treatment, 485 DEG C are heated in wind furnace is recycled, keeps the temperature 3h Hot rolling afterwards, hot rolling mode is first rolls 4 passages along rectangle ingot width direction, then along rectangle ingot length direction rolling 11 It is secondary, it is rolled into the hot rolled plate that thickness is 5mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 475 DEG C are heated in wind furnace is recycled, after keeping the temperature 3h, is furnace-cooled to Room temperature obtains annealed state and rolls plate；

(4) cold rolling：Annealed state is rolled into plate and carries out cold rolling, cold-reduced sheet is made；Wherein, Cold Rolled Plate Thickness 1.2mm；

(5) solution treatment：Solution treatment is carried out in salt bath furnace to cold-reduced sheet, the heating temperature of solution treatment is 542 DEG C, Soaking time is 13min, and the type of cooling is water quenching to room temperature, rolls plate after forming solution treatment；

(7) Pre-aging treatment：To rolling plate, progress Pre-aging treatment after being placed at room temperature for, pre-ageing treatment temperature is 165 DEG C, The Pre-aging treatment time is 10min, and the type of cooling forms after Pre-aging treatment to be air-cooled to room temperature and rolls plate；

Embodiment 8

(2) hot rolling：After 6022 aluminium alloy cast ingots are cut off milling surface treatment, 500 DEG C are heated in wind furnace is recycled, keeps the temperature 2h Hot rolling afterwards, hot rolling mode is first rolls 5 passages along rectangle ingot width direction, then along rectangle ingot length direction rolling 10 It is secondary, it is rolled into the hot rolled plate that thickness is 4mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 475 DEG C are heated in wind furnace is recycled, after keeping the temperature 6h, is furnace-cooled to Room temperature obtains annealed state and rolls plate；

(5) solution treatment：Solution treatment is carried out in salt bath furnace to cold-reduced sheet, the heating temperature of solution treatment is 545 DEG C, Soaking time is 15min, and the type of cooling is water quenching to room temperature, rolls plate after forming solution treatment；

Embodiment 9

(2) hot rolling：After 6022 aluminium alloy cast ingots are cut off milling surface treatment, 475 DEG C are heated in wind furnace is recycled, keeps the temperature 2h Hot rolling afterwards, hot rolling mode is first rolls 2 passages along rectangle ingot width direction, then along rectangle ingot length direction rolling 12 It is secondary, it is rolled into the hot rolled plate that thickness is 6mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 480 DEG C are heated in wind furnace is recycled, after keeping the temperature 2h, is furnace-cooled to Room temperature obtains annealed state and rolls plate；

(5) solution treatment：Solution treatment is carried out in salt bath furnace to cold-reduced sheet, the heating temperature of solution treatment is 550 DEG C, Soaking time is 10min, and the type of cooling is water quenching to room temperature, rolls plate after forming solution treatment；

Embodiment 10

(2) hot rolling：After 6022 aluminium alloy cast ingots are cut off milling surface treatment, 465 DEG C are heated in wind furnace is recycled, keeps the temperature 4h Hot rolling afterwards, hot rolling mode is first rolls 4 passages along rectangle ingot width direction, then along rectangle ingot length direction rolling 13 It is secondary, it is rolled into the hot rolled plate that thickness is 5mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 480 DEG C are heated in wind furnace is recycled, after keeping the temperature 5h, is furnace-cooled to Room temperature obtains annealed state and rolls plate；

(5) solution treatment：Solution treatment is carried out in salt bath furnace to cold-reduced sheet, the heating temperature of solution treatment is 540 DEG C, Soaking time is 15min, and the type of cooling is water quenching to room temperature, rolls plate after forming solution treatment；

(7) Pre-aging treatment：To rolling plate, progress Pre-aging treatment after being placed at room temperature for, pre-ageing treatment temperature is 185 DEG C, The Pre-aging treatment time is 10min, and the type of cooling forms after Pre-aging treatment to be air-cooled to room temperature and rolls plate；

Embodiment 11

(2) hot rolling：After 6022 aluminium alloy cast ingots are cut off milling surface treatment, 470 DEG C are heated in wind furnace is recycled, keeps the temperature 3h Hot rolling afterwards, hot rolling mode is first rolls 2 passages along rectangle ingot width direction, then along rectangle ingot length direction rolling 13 It is secondary, it is rolled into the hot rolled plate that thickness is 5mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 485 DEG C are heated in wind furnace is recycled, after keeping the temperature 2h, is furnace-cooled to Room temperature obtains annealed state and rolls plate；

(5) solution treatment：Solution treatment is carried out in salt bath furnace to cold-reduced sheet, the heating temperature of solution treatment is 535 DEG C, Soaking time is 11min, and the type of cooling is water quenching to room temperature, rolls plate after forming solution treatment；

(7) Pre-aging treatment：To rolling plate, progress Pre-aging treatment after being placed at room temperature for, pre-ageing treatment temperature is 175 DEG C, The Pre-aging treatment time is 6min, and the type of cooling forms after Pre-aging treatment to be air-cooled to room temperature and rolls plate；

Embodiment 12

(2) hot rolling：After 6022 aluminium alloy cast ingots are cut off milling surface treatment, 495 DEG C are heated in wind furnace is recycled, keeps the temperature 3h Hot rolling afterwards, hot rolling mode is first rolls 3 passages along rectangle ingot width direction, then along rectangle ingot length direction rolling 12 It is secondary, it is rolled into the hot rolled plate that thickness is 6mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 485 DEG C are heated in wind furnace is recycled, after keeping the temperature 5h, is furnace-cooled to Room temperature obtains annealed state and rolls plate；

(7) Pre-aging treatment：To rolling plate, progress Pre-aging treatment after being placed at room temperature for, pre-ageing treatment temperature is 180 DEG C, The Pre-aging treatment time is 10min, and the type of cooling forms after Pre-aging treatment to be air-cooled to room temperature and rolls plate；

Embodiment 13

(2) hot rolling：After 6022 aluminium alloy cast ingots are cut off milling surface treatment, 500 DEG C are heated in wind furnace is recycled, keeps the temperature 4h Hot rolling afterwards, hot rolling mode is first rolls 4 passages along rectangle ingot width direction, then along rectangle ingot length direction rolling 14 It is secondary, it is rolled into the hot rolled plate that thickness is 4mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 490 DEG C are heated in wind furnace is recycled, after keeping the temperature 2h, is furnace-cooled to Room temperature obtains annealed state and rolls plate；

(7) Pre-aging treatment：To rolling plate, progress Pre-aging treatment after being placed at room temperature for, pre-ageing treatment temperature is 180 DEG C, The Pre-aging treatment time is 9min, and the type of cooling forms after Pre-aging treatment to be air-cooled to room temperature and rolls plate；

Embodiment 14

(2) hot rolling：After 6022 aluminium alloy cast ingots are cut off milling surface treatment, 470 DEG C are heated in wind furnace is recycled, keeps the temperature 4h Hot rolling afterwards, hot rolling mode is first rolls 4 passages along rectangle ingot width direction, then along rectangle ingot length direction rolling 11 It is secondary, it is rolled into the hot rolled plate that thickness is 4mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 490 DEG C are heated in wind furnace is recycled, after keeping the temperature 6h, is furnace-cooled to Room temperature obtains annealed state and rolls plate；

(5) solution treatment：Solution treatment is carried out in salt bath furnace to cold-reduced sheet, the heating temperature of solution treatment is 545 DEG C, Soaking time is 10min, and the type of cooling is water quenching to room temperature, rolls plate after forming solution treatment；

(7) Pre-aging treatment：To rolling plate, progress Pre-aging treatment after being placed at room temperature for, pre-ageing treatment temperature is 160 DEG C, The Pre-aging treatment time is 10min, and the type of cooling forms after Pre-aging treatment to be air-cooled to room temperature and rolls plate；

Embodiment 15

(2) hot rolling：After 6022 aluminium alloy cast ingots are cut off milling surface treatment, 500 DEG C are heated in wind furnace is recycled, keeps the temperature 3h Hot rolling afterwards, hot rolling mode is first rolls 4 passages along rectangle ingot width direction, then along rectangle ingot length direction rolling 11 It is secondary, it is rolled into the hot rolled plate that thickness is 4mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 495 DEG C are heated in wind furnace is recycled, after keeping the temperature 2h, is furnace-cooled to Room temperature obtains annealed state and rolls plate；

(5) solution treatment：Solution treatment is carried out in salt bath furnace to cold-reduced sheet, the heating temperature of solution treatment is 550 DEG C, Soaking time is 12min, and the type of cooling is water quenching to room temperature, rolls plate after forming solution treatment；

(7) Pre-aging treatment：To rolling plate, progress Pre-aging treatment after being placed at room temperature for, pre-ageing treatment temperature is 175 DEG C, The Pre-aging treatment time is 10min, and the type of cooling forms after Pre-aging treatment to be air-cooled to room temperature and rolls plate；

Embodiment 16

(2) hot rolling：After 6022 aluminium alloy cast ingots are cut off milling surface treatment, 455 DEG C are heated in wind furnace is recycled, keeps the temperature 3h Hot rolling afterwards, hot rolling mode is first rolls 2 passages along rectangle ingot width direction, then along rectangle ingot length direction rolling 11 It is secondary, it is rolled into the hot rolled plate that thickness is 5mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 495 DEG C are heated in wind furnace is recycled, after keeping the temperature 5h, is furnace-cooled to Room temperature obtains annealed state and rolls plate；

(7) Pre-aging treatment：To rolling plate, progress Pre-aging treatment after being placed at room temperature for, pre-ageing treatment temperature is 170 DEG C, The Pre-aging treatment time is 6min, and the type of cooling forms after Pre-aging treatment to be air-cooled to room temperature and rolls plate；

Embodiment 17

(2) hot rolling：After 6022 aluminium alloy cast ingots are cut off milling surface treatment, 460 DEG C are heated in wind furnace is recycled, keeps the temperature 2h Hot rolling afterwards, hot rolling mode is first rolls 2 passages along rectangle ingot width direction, then along rectangle ingot length direction rolling 14 It is secondary, it is rolled into the hot rolled plate that thickness is 5mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 500 DEG C are heated in wind furnace is recycled, after keeping the temperature 3h, is furnace-cooled to Room temperature obtains annealed state and rolls plate；

(5) solution treatment：Solution treatment is carried out in salt bath furnace to cold-reduced sheet, the heating temperature of solution treatment is 545 DEG C, Soaking time is 12min, and the type of cooling is water quenching to room temperature, rolls plate after forming solution treatment；

(6) it is placed at room temperature for：12min is placed at room temperature for rolling plate after solution treatment；

(7) Pre-aging treatment：To rolling plate, progress Pre-aging treatment after being placed at room temperature for, pre-ageing treatment temperature is 175 DEG C, The Pre-aging treatment time is 9min, and the type of cooling forms after Pre-aging treatment to be air-cooled to room temperature and rolls plate；

(8) it is placed at room temperature for：Plate will be rolled after Pre-aging treatment, be placed at room temperature for 4 weeks or more, as T4P states, 6022- is made T4P aluminum alloy plate materials.

Embodiment 18

(2) hot rolling：After 6022 aluminium alloy cast ingots are cut off milling surface treatment, 455 DEG C are heated in wind furnace is recycled, keeps the temperature 4h Hot rolling afterwards, hot rolling mode is first rolls 3 passages along rectangle ingot width direction, then along rectangle ingot length direction rolling 12 It is secondary, it is rolled into the hot rolled plate that thickness is 4.5mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 500 DEG C are heated in wind furnace is recycled, after keeping the temperature 5h, is furnace-cooled to Room temperature obtains annealed state and rolls plate；

(7) Pre-aging treatment：To rolling plate, progress Pre-aging treatment after being placed at room temperature for, pre-ageing treatment temperature is 185 DEG C, The Pre-aging treatment time is 8min, and the type of cooling forms after Pre-aging treatment to be air-cooled to room temperature and rolls plate；

Embodiment 19

(2) hot rolling：After 6022 aluminium alloy cast ingots are cut off milling surface treatment, 500 DEG C are heated in wind furnace is recycled, keeps the temperature 3h Hot rolling afterwards, hot rolling mode is first rolls 4 passages along rectangle ingot width direction, then along rectangle ingot length direction rolling 11 It is secondary, it is rolled into the hot rolled plate that thickness is 4.5mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 505 DEG C are heated in wind furnace is recycled, after keeping the temperature 3h, is furnace-cooled to Room temperature obtains annealed state and rolls plate；

(5) solution treatment：Solution treatment is carried out in salt bath furnace to cold-reduced sheet, the heating temperature of solution treatment is 545 DEG C, Soaking time is 13min, and the type of cooling is water quenching to room temperature, rolls plate after forming solution treatment；

(7) Pre-aging treatment：To rolling plate, progress Pre-aging treatment after being placed at room temperature for, pre-ageing treatment temperature is 180 DEG C, The Pre-aging treatment time is 8min, and the type of cooling forms after Pre-aging treatment to be air-cooled to room temperature and rolls plate；

Embodiment 20

(2) hot rolling：After 6022 aluminium alloy cast ingots are cut off milling surface treatment, 500 DEG C are heated in wind furnace is recycled, keeps the temperature 2h Hot rolling afterwards, hot rolling mode is first rolls 5 passages along rectangle ingot width direction, then along rectangle ingot length direction rolling 11 It is secondary, it is rolled into the hot rolled plate that thickness is 5mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 505 DEG C are heated in wind furnace is recycled, after keeping the temperature 6h, is furnace-cooled to Room temperature obtains annealed state and rolls plate；

(6) it is placed at room temperature for：9min is put to rolling plate room temperature after solution treatment；

Embodiment 21

(2) hot rolling：After 6022 aluminium alloy cast ingots are cut off milling surface treatment, 490 DEG C are heated in wind furnace is recycled, keeps the temperature 3h Hot rolling afterwards, hot rolling mode is first rolls 4 passages along rectangle ingot width direction, then along rectangle ingot length direction rolling 13 It is secondary, it is rolled into the hot rolled plate that thickness is 4mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 510 DEG C are heated in wind furnace is recycled, after keeping the temperature 2h, is furnace-cooled to Room temperature obtains annealed state and rolls plate；

(5) solution treatment：Solution treatment is carried out in salt bath furnace to cold-reduced sheet, the heating temperature of solution treatment is 545 DEG C, Soaking time is 11min, and the type of cooling is water quenching to room temperature, rolls plate after forming solution treatment；

(6) it is placed at room temperature for：9min is placed at room temperature for rolling plate after solution treatment；

(7) Pre-aging treatment：To rolling plate, progress Pre-aging treatment after being placed at room temperature for, pre-ageing treatment temperature is 175 DEG C, The Pre-aging treatment time is 5min, and the type of cooling forms after Pre-aging treatment to be air-cooled to room temperature and rolls plate；

Embodiment 22

(2) hot rolling：After 6022 aluminium alloy cast ingots are cut off milling surface treatment, 455 DEG C are heated in wind furnace is recycled, keeps the temperature 2h Hot rolling afterwards, hot rolling mode is first rolls 3 passages along rectangle ingot width direction, then along rectangle ingot length direction rolling 12 It is secondary, it is rolled into the hot rolled plate that thickness is 4mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 510 DEG C are heated in wind furnace is recycled, after keeping the temperature 5h, is furnace-cooled to Room temperature obtains annealed state and rolls plate；

(5) solution treatment：Solution treatment is carried out in salt bath furnace to cold-reduced sheet, the heating temperature of solution treatment is 535 DEG C, Soaking time is 14min, and the type of cooling is water quenching to room temperature, rolls plate after forming solution treatment；

(6) it is placed at room temperature for：11min is placed at room temperature for rolling plate after solution treatment；

Embodiment 23

(2) hot rolling：After 6022 aluminium alloy cast ingots are cut off milling surface treatment, 485 DEG C are heated in wind furnace is recycled, keeps the temperature 4h Hot rolling afterwards, hot rolling mode is first rolls 3 passages along rectangle ingot width direction, then along rectangle ingot length direction rolling 12 It is secondary, it is rolled into the hot rolled plate that thickness is 5mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 520 DEG C are heated in wind furnace is recycled, after keeping the temperature 3h, is furnace-cooled to Room temperature obtains annealed state and rolls plate；

(5) solution treatment：Solution treatment is carried out in salt bath furnace to cold-reduced sheet, the heating temperature of solution treatment is 540 DEG C, Soaking time is 10min, and the type of cooling is water quenching to room temperature, rolls plate after forming solution treatment；

(7) Pre-aging treatment：To rolling plate, progress Pre-aging treatment after being placed at room temperature for, pre-ageing treatment temperature is 185 DEG C, The Pre-aging treatment time is 5min, and the type of cooling forms after Pre-aging treatment to be air-cooled to room temperature and rolls plate；

Embodiment 24

(2) hot rolling：After 6022 aluminium alloy cast ingots are cut off milling surface treatment, 470 DEG C are heated in wind furnace is recycled, keeps the temperature 3h Hot rolling afterwards, hot rolling mode is first rolls 3 passages along rectangle ingot width direction, then along rectangle ingot length direction rolling 12 It is secondary, it is rolled into the hot rolled plate that thickness is 4.5mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 530 DEG C are heated in wind furnace is recycled, after keeping the temperature 5h, is furnace-cooled to Room temperature obtains annealed state and rolls plate；

Embodiment 25

(2) hot rolling：After 6022 aluminium alloy cast ingots are cut off milling surface treatment, 470 DEG C are heated in wind furnace is recycled, keeps the temperature 4h Hot rolling afterwards, hot rolling mode is first rolls 3 passages along rectangle ingot width direction, then along rectangle ingot length direction rolling 13 It is secondary, it is rolled into the hot rolled plate that thickness is 4.5mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 540 DEG C are heated in wind furnace is recycled, after keeping the temperature 2h, is furnace-cooled to Room temperature obtains annealed state and rolls plate；

Embodiment 26

(2) hot rolling：After 6022 aluminium alloy cast ingots are cut off milling surface treatment, 470 DEG C are heated in wind furnace is recycled, keeps the temperature 2h Hot rolling afterwards, hot rolling mode is first rolls 3 passages along rectangle ingot width direction, then along rectangle ingot length direction rolling 15 It is secondary, it is rolled into the hot rolled plate that thickness is 4.5mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 550 DEG C are heated in wind furnace is recycled, after keeping the temperature 6h, is furnace-cooled to Room temperature obtains annealed state and rolls plate；

(7) Pre-aging treatment：To rolling plate, progress Pre-aging treatment after being placed at room temperature for, pre-ageing treatment temperature is 190 DEG C, The Pre-aging treatment time is 10min, and the type of cooling forms after Pre-aging treatment to be air-cooled to room temperature and rolls plate；

Claims

1. a kind of body of a motor car preparation method of 6022 aluminum alloy plate materials, it is characterised in that include the following steps：

(1) prepared by ingot casting：Prepare 6022 aluminium alloy cast ingots；

(3) intermediate annealing：Hot rolled plate is heated to 460~550 DEG C, after keeping the temperature 2~6h, room temperature is cooled to the furnace, is annealed State rolls plate；

(5) solution treatment：Solution treatment is carried out to cold-reduced sheet, rolls plate after forming solution treatment；The temperature of solution treatment for 535~ 550 DEG C, the time is 10~15min, and the type of cooling is water quenching to room temperature；

(7) Pre-aging treatment：Pre-aging treatment is carried out to rolling plate after being placed at room temperature for, rolls plate after forming Pre-aging treatment；It is wherein pre- Aging temperature is 160~190 DEG C, and the time is 5~10min, and the type of cooling is is air-cooled to room temperature；

(8) it is placed at room temperature for：4 weeks or more are placed at room temperature for rolling plate after Pre-aging treatment, as T4P states, body of a motor car is made and uses 6022 aluminum alloy plate materials.

A kind of 2. preparation method of 6022 aluminum alloy plate materials of body of a motor car according to claim 1, it is characterised in that institute The ingredient of 6022 aluminium alloy cast ingots stated is by mass percentage：Si：0.80~1.10%, Mg：0.45~0.70%, Cu≤ 0.11%, Mn≤0.10%, Fe≤0.20%, Zn≤0.25%, Cr≤0.10%, Ti≤0.15%, impurity element≤ 0.15%, surplus Al.

A kind of 3. preparation method of 6022 aluminum alloy plate materials of body of a motor car according to claim 1, it is characterised in that institute 6022 aluminium alloy cast ingots stated are made using direct water-cooling semi-continuous casting.

A kind of 4. preparation method of 6022 aluminum alloy plate materials of body of a motor car according to claim 1, it is characterised in that institute 6022 aluminium alloy cast ingots stated before heating, through cropping milling surface treatment.Hot rolling mode is mutually tied for cross rolling and longitudinal direction rolling It closing, course of hot rolling first rolls 2~5 passages along ingot casting width direction, and 10~16 passages are rolled then along slab ingot length direction, Obtain hot rolled plate.

A kind of 5. preparation method of 6022 aluminum alloy plate materials of body of a motor car according to claim 1, it is characterised in that institute The 6022 aluminium alloy cast ingot thickness stated are 150mm, and the hot rolling plate thickness is 4~6mm, and the Cold Rolled Plate Thickness is 0.8 ~1.2mm.

A kind of 6. preparation method of 6022 aluminum alloy plate materials of body of a motor car according to claim 1, it is characterised in that institute The body of a motor car stated is with the performance indicator of 6022 aluminum alloy plate materials：σ_0.2=130~137MPa, σ_b=241~250MPa, r₁₅ =0.60~0.73, n (strain hardening exponent)=0.24~0.29, δ=26.0~27.3%, I_E=7.61~8.05mm.

A kind of 7. preparation method of 6022 aluminum alloy plate materials of body of a motor car according to claim 1, it is characterised in that institute The body of a motor car stated is with the performance indicator after the paint baking of 6022 aluminum alloy plate materials：σ_0.2=200~212MPa, σ_b=270 ~283MPa, δ=22.6~23.9%.