CN108265245A

CN108265245A - A kind of preparation method of 6009 aluminum alloy plate materials of body of a motor car

Info

Publication number: CN108265245A
Application number: CN201810182525.XA
Authority: CN
Inventors: 田妮; 刘启隆; 张豪; 王光东; 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: 2018-07-10

Abstract

A kind of body of a motor car preparation method of 6009 aluminum alloy plate materials, includes the following steps：(1) 6009 aluminium alloy cast ingots are prepared；(2) 6009 aluminium alloy cast ingots are heated to 200~400 DEG C, keep the temperature 2~6h；460~500 DEG C are then raised temperature to, hot rolling of coming out of the stove after 2~4h of heat preservation；(3) 480~550 DEG C are heated to, keeps the temperature 2~6h furnace coolings；(4) cold rolling obtains cold-reduced sheet；(5) solution treatment；(6) it is placed at room temperature for 5~30min；(7) Pre-aging treatment；(8) it to rolling plate after Pre-aging treatment, carries out being placed at room temperature for 4 weeks or more, 6009 aluminum alloy plate materials of body of a motor car is made.The present invention method can significantly shorten 6009 car body of aluminum alloy plates 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 6009 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 6009 aluminium The preparation method of golden plate material.

Background technology

While China's automobile industry high speed development, bring that such as traffic congestion, environmental pollution be serious, energy consumption mistake A series of social concerns such as big.Aluminium alloy density is the 1/3 of steel, using aluminium alloy to vehicle body, a weight loss effect up to 30~ 40%, secondary loss of weight then can further improve to 50%, and aluminium alloy also has good deep drawability, corrosion resistance and dissipates Hot property, it should be noted that also there is excellent energy absorption performance when aluminium alloy collides；Therefore, body of a motor car calorize is The mainstream of automotive light weight technology at present.

At present, Aluminum alloy for automotive body plank mainly has 2xxx systems, 5xxx systems and 6xxx systems.Wherein 6xxx line aluminium alloys Thin plate has the main direction of development that good comprehensive performance becomes current vehicle body outside plate；Europe and Japan favor in use close 6009 relatively low aluminum alloy plate materials of gold dollar cellulose content have preferable press formability, after sheet material forming after T4P is handled Vehicle body by baking vanish application can realize artificial aging strengthen, obtain higher intensity, improve the dent resistance energy of vehicle body； Current 6009 aluminum alloy plate materials have been applied to automobile engine cover inner and outer plates, outer panel in car door, the portions such as inner panel at the top of driver's cabin Position.However, conventional automobile bodies are significantly larger than with the production cost of 6009 aluminum alloy plate materials using vehicle body prepared by traditional handicraft With steel plate, and its deep drawability also has certain gap compared with low carbon steel plate, this is the bottle that 6009 aluminium sheets is hindered to substitute steel plate on a large scale Neck problem；Therefore, how further to improve the deep drawability of 6009 aluminum alloy plate materials, while significantly reduce car body of aluminum alloy plate Material processing cost is imperative.

Invention content

Present invention aims at a kind of preparation method of 6009 aluminum alloy plate materials of body of a motor car is provided, in traditional processing side Homogenization Treatments technique is saved on the basis of method, hot rolled plate intermediate anneal temperature is increased substantially, annealing heat preservation is appropriately extended, show Write shorten 6009 car body of aluminum alloy plates production procedure, it is energy saving, production cost is greatly lowered, and can carry simultaneously The press formability and baking hardenability of high alloy plank.

The method of the present invention includes the following steps：

(1) prepared by ingot casting：6009 aluminium alloy cast ingots are prepared using semi-continuous casting method；

(2) pretreatment and hot rolling：6009 aluminium alloy cast ingots are heated to 200~400 DEG C, keep the temperature 2~6h；It then raises temperature to It 460~500 DEG C, comes out of the stove hot rolling after keeping the temperature 2~4h, obtains hot rolled plate；

(3) intermediate annealing：Hot rolled plate is heated to 480~550 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, cold-reduced sheet is made；

(5) solution treatment：Solution treatment is carried out to cold-reduced sheet, obtains solution treatment state plank；Wherein solid solution temperature 535~550 DEG C, 10~15min of time, the type of cooling is water quenching to room temperature；

(6) it is placed at room temperature for：Solution treatment state plank is placed at room temperature for 5~30min；

(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 Pre-aging treatment time is 5~10min, and the type of cooling is is air-cooled to room temperature；

(8) it is placed at room temperature for：To rolling plate after Pre-aging treatment, carry out being placed at room temperature for 4 weeks or more, as T4P states, vapour is made 6009 aluminum alloy plate materials of vehicle vehicle body.

In the step (1), ingredient and its mass percent that 6009 aluminium alloy cast ingots contain are：Si：0.60~ 1.00%, Mg：0.40~0.80%, Mn：0.20~0.80%, Cu：0.15~0.60%, Fe≤0.50%, Zn≤ 0.25%, Cr≤0.10%, Ti≤0.10%, impurity element≤0.15%, surplus Al.

6009 above-mentioned aluminium alloy cast ingot thickness be 170mm, hot rolling plate thickness be 4~7mm, Cold Rolled Plate Thickness 0.8~ 1.2mm。

In the step (1), 6009 aluminium alloy cast ingots are made using semi-continuous casting (DC castings).

In the step (2), 6009 aluminium alloy cast ingots before heating, through cropping milling surface treatment.

Above-mentioned body of a motor car is with the performance indicator of 6009 aluminum alloy plate materials：σ_0.2=120~126MPa, σ_b=229~ 235MPa, r₁₅=0.72~0.81, n (strain hardening exponent)=0.25~0.27, δ=27.3~29.8%, I_E=8.70~ 9.08mm。

Above-mentioned body of a motor car is with the performance indicator after the paint baking of 6009 aluminum alloy plate materials：σ_0.2=217~ 230MPa, σ_b=288~297MPa, δ=19.0~22.0%.

Above-mentioned hot rolling mode is combined for cross rolling with longitudinally rolling, and course of hot rolling is first rolled along ingot casting width direction 3~5 passages are made, 10~15 passages is rolled then along slab ingot length direction, obtains hot rolled plate.

Traditional 6009 car body of aluminum alloy plate preparation processes are cast for DC at (Direct Chill Casting) → homogenization Reason → hot rolling → intermediate annealing → cold rolling → solution treatment/preageing → supply of material is parked, wherein 6009 aluminium alloy cast ingots homogenize Treatment temperature generally above 530 DEG C, soaking time be more than 12h, not only time-consuming energy consumption, and seriously reduce production efficiency, Significantly improve production cost, it is often more important that mainly part occurs for the crystalline phase containing AlMnFeSi during Homogenization Treatments Dissolving is shunk, aggregation nodularization, and this big blocky superfluous crystalline phase is broken and along deformation direction in broken during deformation after unloading Chainlike distribution, this surplus crystalline phase shape of particle and distribution can deteriorate the stamping formabilily of plank；If using without uniformly Change and handle direct hot rolling, 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 Border application value；The study found that by slab of 6009 aluminium alloy cast ingot of semi-continuous casting without the direct hot rolling of uniform treatment, then pass through 420 DEG C or so of conventional intermediate annealing process, the plank that then cold rolling, solid solution, Pre-aging treatment are prepared again have good dry It bakes hardenability but formability is still not fully up to expectations；Deep study and analysis is found, although can be obtained without the direct hot rolling of uniform treatment 6009 aluminium sheets of superfluous crystalline phase particle fine uniform Dispersed precipitate are obtained, but since intermediate anneal temperature is relatively low, annealing heat preservation Time is shorter, solvable phase is caused to be difficult in follow-up conventional solid solution processing procedure during complete back dissolving enters matrix, more important is not Solvable surplus crystalline phase particle still has obvious wedge angle after the processing of conventional intermediate annealing process, fails to apparent ball Change, this be cause to use at present fail to obtain excellent deep-draw without 6009 car body of aluminum alloy plates prepared by Homogenization Treatments technique The critical issue of performance；Further innovation experiment, continuous analysis and summary experimental result update experimental program, and the present invention proposes prominent Broken routine intermediate anneal temperature combines the inventive concept that annealing soaking time is appropriately extended, and develops novel low-cost preparation 6009 aluminium sheet fabricating technology of high deep drawing quality and high baking hardenability.

The method of the present invention saves Homogenization Treatments technique, and improve intermediate annealing system on the basis of traditional diamond-making technique Degree；Alloy cast ingot by Homogenization Treatments, is not directly over low-temperature short-time pretreatment to regulate and control containing Mn, Cr disperse phase particle It is precipitated, then carries out hot rolling, crystalline phase is distributed in the base to small and dispersed by after grating；In conventional intermediate annealing process Further improved on the basis of (420~440 DEG C, 1~2h) intermediate anneal temperature be appropriately extended simultaneously intermediate annealing heat preservation when Between, the dissolving for making solvable crystalline phase is more abundant, and nodularization occurs for the crystalline phase of tiny fragmentation, can improve 6009 aluminum alloy plate materials Press formability；The 6009 vehicle body plate deep drawabilities prepared after through cold rolling, solid solution water quenching, Pre-aging treatment and baking Roasting hardening capacity is superior to the plank of traditional handicraft preparation；This method can shorten 6009 car body of aluminum alloy plates 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；When combining proper extension annealing heat preservation by improving intermediate anneal temperature Between, make solvable crystallization phased soln, superfluous crystalline phase particle edges are round and smooth, nodularization, and 6009 aluminium alloys are improved simultaneously so as to final The press formability of plank and baking vanish hardenability.It realizes and improves plate while 6009 car body of aluminum alloy plate cost is reduced The deep drawability and baking and hardening performance of material, the economic results in society brought therefrom are considerable.

Description of the drawings

Fig. 1 is that the optical microstructure of 6009 aluminum alloy plate materials made from the embodiment of the present invention 1 schemes；

Fig. 2 is that the optical microstructure of 6009 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.

Made from Examples 1 to 26 and comparative example 1 at the performance indicator and baking vanish of 6009 aluminum alloy plate materials of body of a motor car Performance indicator data after reason are shown in Table 1.

The property after 6009 aluminum alloy plate materials supply of material state performance index and paint baking is made in 1 embodiment and comparative example of table It can index

There is good forming property by 6009 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 6009 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.

6009 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 6009 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 3~5 passages first are rolled along ingot casting width direction, 10~15 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 1 is resistance furnace.

Embodiment 1

A kind of body of a motor car preparation method of 6009 aluminum alloy plate materials, includes the following steps：

(1) prepared by ingot casting：6009 aluminium alloy cast ingots are prepared using semi-continuous casting；

(2) pretreatment and hot rolling：After 6009 aluminium alloy cast ingots are cut off milling surface treatment, 200 are heated in wind furnace is recycled DEG C, keep the temperature 6h；460 DEG C are then raised temperature to, hot rolling of coming out of the stove after heat preservation 4h, hot rolling mode is first rolls along rectangle ingot width direction 5 passages are made, 14 passages are rolled then along rectangle ingot length direction, are rolled into the hot rolled plate that thickness is 4mm；

(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；

(4) cold rolling：Annealed state is rolled into plate and carries out cold rolling, the cold-reduced sheet that thickness is 1.0mm is made；

(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 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；

(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, 6009- is made T4P aluminum alloy plate materials, optical microstructure are as shown in Figure 1；

6009 aluminum alloy plate materials made from the present embodiment are stretched and cupping test, and to made from the present embodiment 6009 aluminum alloy plate materials are after 2% predeformation, then the simulation baking vanish of 170 DEG C × 30min of progress heats in drying box, Then measure its intensity；Related performance indicators data are shown in Table 1.

Comparative example 1

(2) it homogenizes：6009 aluminium alloy cast ingots are fitted into cycle wind furnace, are warming up to 550 DEG C of heat preservations for 24 hours with stove within 2 hours, It comes out of the stove and is air-cooled to room temperature；

(3) hot rolling：After 6009 aluminium alloy cast ingot after cooling is cut off milling surface treatment, 440 DEG C are heated to, keeps the temperature heat after 2h It rolls, hot rolling system rolls 14 passages first to roll 5 passages along rectangle ingot width direction, then along rectangle ingot length direction, It is rolled into the hot rolled plate that thickness is 4mm；

(4) intermediate annealing：After hot rolled plate is cut scale, 420 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, the cold-reduced sheet that thickness is 1.0mm is made；

(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：18min 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 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；

(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, 6009- is made T4P aluminum alloy plate materials, optical microstructure are as shown in Figure 2；

6009 aluminum alloy plate materials made from this comparative example are stretched and cupping test, and to made from this comparative example 6009 aluminum alloy plate materials are after 2% predeformation, then the simulation baking vanish of 170 DEG C × 30min of progress heats in drying box, Then measure its intensity；Related performance indicators data are shown in Table 1.

Embodiment 2

(2) pretreatment and hot rolling：After 6009 aluminium alloy cast ingots are cut off milling surface treatment, 210 are heated in wind furnace is recycled DEG C, keep the temperature 5h；480 DEG C are then raised temperature to, hot rolling of coming out of the stove after heat preservation 3h, hot rolling mode is first rolls along rectangle ingot width direction 4 passages are made, 10 passages are rolled then along rectangle ingot length direction, are 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；

(4) cold rolling：Annealed state is rolled into plate and carries out cold rolling, the cold-reduced sheet that thickness is 0.8mm is made；

(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；

(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 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；

(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, 6009- is made T4P aluminum alloy plate materials；

Embodiment 3

(2) pretreatment and hot rolling：After 6009 aluminium alloy cast ingots are cut off milling surface treatment, 220 are heated in wind furnace is recycled DEG C, keep the temperature 6h；470 DEG C are then raised temperature to, hot rolling of coming out of the stove after heat preservation 3h, hot rolling mode is first rolls along rectangle ingot width direction 4 passages are made, 10 passages are rolled then along rectangle ingot length direction, are rolled into the hot rolled plate that thickness is 4mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 485 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, the cold-reduced sheet that thickness is 0.9mm is made；

(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 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 4

(2) pretreatment and hot rolling：After 6009 aluminium alloy cast ingots are cut off milling surface treatment, 230 are heated in wind furnace is recycled DEG C, keep the temperature 6h；490 DEG C are then raised temperature to, hot rolling of coming out of the stove after heat preservation 2h, hot rolling mode is first rolls along rectangle ingot width direction 3 passages are made, 11 passages are rolled then along rectangle ingot length direction, are 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 6h, 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, the cold-reduced sheet that thickness is 1.1mm is made；

(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；

(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 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 5

(2) pretreatment and hot rolling：After 6009 aluminium alloy cast ingots are cut off milling surface treatment, 240 are heated in wind furnace is recycled DEG C, keep the temperature 6h；480 DEG C are then raised temperature to, hot rolling of coming out of the stove after heat preservation 3h, hot rolling mode is first rolls along rectangle ingot width direction 4 passages are made, 13 passages are rolled then along rectangle ingot length direction, are rolled into the hot rolled plate that thickness is 5mm；

(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；

(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；

(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；

Embodiment 6

(2) pretreatment and hot rolling：After 6009 aluminium alloy cast ingots are cut off milling surface treatment, 250 are heated in wind furnace is recycled DEG C, keep the temperature 4h；460 DEG C are then raised temperature to, hot rolling of coming out of the stove after heat preservation 3h, hot rolling mode is first rolls along rectangle ingot width direction 5 passages are made, 12 passages are rolled then along rectangle ingot length direction, are 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 550 DEG C, Soaking time is 10min, 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：30min 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 7

(2) pretreatment and hot rolling：After 6009 aluminium alloy cast ingots are cut off milling surface treatment, 260 are heated in wind furnace is recycled DEG C, keep the temperature 5h；470 DEG C are then raised temperature to, hot rolling of coming out of the stove after heat preservation 2h, hot rolling mode is first rolls along rectangle ingot width direction 4 passages are made, 14 passages are rolled then along rectangle ingot length direction, are rolled into the hot rolled plate that thickness is 6mm；

(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；

(4) cold rolling：Annealed state is rolled into plate and carries out cold rolling, the cold-reduced sheet that thickness is 1.2mm is made；

(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；

(6) it is placed at room temperature for：25min 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 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 8

(2) pretreatment and hot rolling：After 6009 aluminium alloy cast ingots are cut off milling surface treatment, 270 are heated in wind furnace is recycled DEG C, keep the temperature 6h；480 DEG C are then raised temperature to, hot rolling of coming out of the stove after heat preservation 3h, hot rolling mode is first rolls along rectangle ingot width direction 3 passages are made, 15 passages are rolled then along rectangle ingot length direction, are 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 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 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 9

(2) pretreatment and hot rolling：After 6009 aluminium alloy cast ingots are cut off milling surface treatment, 280 are heated in wind furnace is recycled DEG C, keep the temperature 4h；480 DEG C are then raised temperature to, hot rolling of coming out of the stove after heat preservation 2h, hot rolling mode is first rolls along rectangle ingot width direction 4 passages are made, 15 passages are rolled then along rectangle ingot length direction, are rolled into the hot rolled plate that thickness is 4mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 500 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 10

(2) pretreatment and hot rolling：After 6009 aluminium alloy cast ingots are cut off milling surface treatment, 290 are heated in wind furnace is recycled DEG C, keep the temperature 3h；460 DEG C are then raised temperature to, hot rolling of coming out of the stove after heat preservation 2h, hot rolling mode is first rolls along rectangle ingot width direction 3 passages are made, 10 passages are rolled then along rectangle ingot length direction, are 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 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 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 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 11

(2) pretreatment and hot rolling：After 6009 aluminium alloy cast ingots are cut off milling surface treatment, 300 are heated in wind furnace is recycled DEG C, keep the temperature 4h；470 DEG C are then raised temperature to, hot rolling of coming out of the stove after heat preservation 2h, hot rolling mode is first rolls along rectangle ingot width direction 5 passages are made, 10 passages are rolled then along rectangle ingot length direction, are rolled into the hot rolled plate that thickness is 6mm；

(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 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：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 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 12

(2) pretreatment and hot rolling：After 6009 aluminium alloy cast ingots are cut off milling surface treatment, 310 are heated in wind furnace is recycled DEG C, keep the temperature 5h；490 DEG C are then raised temperature to, hot rolling of coming out of the stove after heat preservation 3h, hot rolling mode is first rolls along rectangle ingot width direction 3 passages are made, 10 passages are rolled then along rectangle ingot length direction, are rolled into the hot rolled plate that thickness is 7mm；

(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；

(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 13

(2) pretreatment and hot rolling：After 6009 aluminium alloy cast ingots are cut off milling surface treatment, 320 are heated in wind furnace is recycled DEG C, keep the temperature 4h；500 DEG C are then raised temperature to, hot rolling of coming out of the stove after heat preservation 3h, hot rolling mode is first rolls along rectangle ingot width direction 4 passages are made, 11 passages are rolled then along rectangle ingot length direction, are 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 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 14

(2) pretreatment and hot rolling：After 6009 aluminium alloy cast ingots are cut off milling surface treatment, 330 are heated in wind furnace is recycled DEG C, keep the temperature 4h；460 DEG C are then raised temperature to, hot rolling of coming out of the stove after heat preservation 2h, hot rolling mode is first rolls along rectangle ingot width direction 4 passages are made, 13 passages are rolled then along rectangle ingot length direction, are rolled into the hot rolled plate that thickness is 7mm；

(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；

(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 15

(2) pretreatment and hot rolling：After 6009 aluminium alloy cast ingots are cut off milling surface treatment, 330 are heated in wind furnace is recycled DEG C, keep the temperature 4h；480 DEG C are then raised temperature to, hot rolling of coming out of the stove after heat preservation 3h, hot rolling mode is first rolls along rectangle ingot width direction 4 passages are made, 13 passages are rolled then along rectangle ingot length direction, are rolled into the hot rolled plate that thickness is 6mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 515 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；

(6) it is placed at room temperature for：17min is placed at room temperature for rolling plate after solution treatment；

Embodiment 16

(2) pretreatment and hot rolling：After 6009 aluminium alloy cast ingots are cut off milling surface treatment, 340 are heated in wind furnace is recycled DEG C, keep the temperature 5h；470 DEG C are then raised temperature to, hot rolling of coming out of the stove after heat preservation 2h, hot rolling mode is first rolls along rectangle ingot width direction 5 passages are made, 14 passages are rolled then along rectangle ingot length direction, are rolled into the hot rolled plate that thickness is 5mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 515 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 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 9min, and the type of cooling forms after Pre-aging treatment to be air-cooled to room temperature and rolls plate；

Embodiment 17

(2) pretreatment and hot rolling：After 6009 aluminium alloy cast ingots are cut off milling surface treatment, 350 are heated in wind furnace is recycled DEG C, keep the temperature 6h；480 DEG C are then raised temperature to, hot rolling of coming out of the stove after heat preservation 4h, hot rolling mode is first rolls along rectangle ingot width direction 3 passages are made, 12 passages are rolled then along rectangle ingot length direction, are rolled into the hot rolled plate that thickness is 4mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 520 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 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 18

(2) pretreatment and hot rolling：After 6009 aluminium alloy cast ingots are cut off milling surface treatment, 360 are heated in wind furnace is recycled DEG C, keep the temperature 2h；490 DEG C are then raised temperature to, hot rolling of coming out of the stove after heat preservation 3h, hot rolling mode is first rolls along rectangle ingot width direction 3 passages are made, 10 passages are rolled then along rectangle ingot length direction, are rolled into the hot rolled plate that thickness is 4mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 520 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 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 19

(2) pretreatment and hot rolling：After 6009 aluminium alloy cast ingots are cut off milling surface treatment, 370 are heated in wind furnace is recycled DEG C, keep the temperature 4h；490 DEG C are then raised temperature to, hot rolling of coming out of the stove after heat preservation 3h, hot rolling mode is first rolls along rectangle ingot width direction 4 passages are made, 11 passages are rolled then along rectangle ingot length direction, are rolled into the hot rolled plate that thickness is 5mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 525 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 20

(2) pretreatment and hot rolling：After 6009 aluminium alloy cast ingots are cut off milling surface treatment, 380 are heated in wind furnace is recycled DEG C, keep the temperature 4h；490 DEG C are then raised temperature to, hot rolling of coming out of the stove after heat preservation 3h, hot rolling mode is first rolls along rectangle ingot width direction 4 passages are made, 11 passages are rolled then along rectangle ingot length direction, are rolled into the hot rolled plate that thickness is 5mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 525 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；

Embodiment 21

(2) pretreatment and hot rolling：After 6009 aluminium alloy cast ingots are cut off milling surface treatment, 400 are heated in wind furnace is recycled DEG C, keep the temperature 5h；500 DEG C are then raised temperature to, hot rolling of coming out of the stove after heat preservation 4h, hot rolling mode is first rolls along rectangle ingot width direction 3 passages are made, 15 passages are rolled then along rectangle ingot length direction, are rolled into the hot rolled plate that thickness is 4mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 530 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 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 5min, and the type of cooling forms after Pre-aging treatment to be air-cooled to room temperature and rolls plate；

Embodiment 22

(2) pretreatment and hot rolling：After 6009 aluminium alloy cast ingots are cut off milling surface treatment, 210 are heated in wind furnace is recycled DEG C, keep the temperature 6h；500 DEG C are then raised temperature to, hot rolling of coming out of the stove after heat preservation 4h, hot rolling mode is first rolls along rectangle ingot width direction 5 passages are made, 14 passages are rolled then along rectangle ingot length direction, are rolled into the hot rolled plate that thickness is 4mm；

(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；

(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；

Embodiment 23

(2) pretreatment and hot rolling：After 6009 aluminium alloy cast ingots are cut off milling surface treatment, 220 are heated in wind furnace is recycled DEG C, keep the temperature 5h；500 DEG C are then raised temperature to, hot rolling of coming out of the stove after heat preservation 3h, hot rolling mode is first rolls along rectangle ingot width direction 5 passages are made, 11 passages are rolled then along rectangle ingot length direction, are rolled into the hot rolled plate that thickness is 4.5mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 535 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；

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

Embodiment 24

(2) pretreatment and hot rolling：After 6009 aluminium alloy cast ingots are cut off milling surface treatment, 230 are heated in wind furnace is recycled DEG C, keep the temperature 4h；500 DEG C are then raised temperature to, hot rolling of coming out of the stove after heat preservation 2h, hot rolling mode is first rolls along rectangle ingot width direction 3 passages are made, 10 passages are rolled then along rectangle ingot length direction, are rolled into the hot rolled plate that thickness is 4.5mm；

(3) intermediate annealing：After hot rolled plate is cut scale, 535 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 8min, and the type of cooling forms after Pre-aging treatment to be air-cooled to room temperature and rolls plate；

Embodiment 25

(2) pretreatment and hot rolling：After 6009 aluminium alloy cast ingots are cut off milling surface treatment, 240 are heated in wind furnace is recycled DEG C, keep the temperature 2h；500 DEG C are then raised temperature to, hot rolling of coming out of the stove after heat preservation 4h, hot rolling mode is first rolls along rectangle ingot width direction 3 passages are made, 10 passages are rolled then along rectangle ingot length direction, are rolled into the hot rolled plate that thickness is 4.6mm；

(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；

(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；

Embodiment 26

(2) pretreatment and hot rolling：After 6009 aluminium alloy cast ingots are cut off milling surface treatment, 250 are heated in wind furnace is recycled DEG C, keep the temperature 3h；490 DEG C are then raised temperature to, hot rolling of coming out of the stove after heat preservation 3h, hot rolling mode is first rolls along rectangle ingot width direction 3 passages are made, 11 passages are rolled then along rectangle ingot length direction, are rolled into the hot rolled plate that thickness is 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 165 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；

Claims

1. a kind of body of a motor car preparation method of 6009 aluminum alloy plate materials, it is characterised in that include the following steps：

(1) prepared by ingot casting：Prepare 6009 aluminium alloy cast ingots；

(2) pretreatment and hot rolling：6009 aluminium alloy cast ingots are heated to 200~400 DEG C, keep the temperature 2~6h；Then raise temperature to 460 It~500 DEG C, comes out of the stove hot rolling after keeping the temperature 2~4h, obtains hot rolled plate；

(3) intermediate annealing：Hot rolled plate is heated to 480~550 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, obtains solution treatment state plank；Wherein solid solution temperature 535~ 550 DEG C, 10~15min of time, 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 Pre-aging treatment time is 5~10min, and the type of cooling is is air-cooled to room temperature；

(8) it is placed at room temperature for：To rolling plate after Pre-aging treatment, carry out being placed at room temperature for 4 weeks or more, as T4P states, body of a motor car is made With 6009 aluminum alloy plate materials.

A kind of 2. preparation method of 6009 aluminum alloy plate materials of body of a motor car according to claim 1, it is characterised in that institute The ingredient and its mass percent that 6009 aluminium alloy cast ingots stated contain be：Si：0.60~1.00%, Mg：0.40~0.80%, Mn：0.20~0.80%, Cu：0.15~0.60%, Fe≤0.50%, Zn≤0.25%, Cr≤0.10%, Ti≤0.10%, Impurity element≤0.15%, surplus Al.

A kind of 3. preparation method of 6009 aluminum alloy plate materials of body of a motor car according to claim 1, it is characterised in that institute 6009 aluminium alloy cast ingots stated are made using direct water-cooling semi-continuous casting.

A kind of 4. preparation method of 6009 aluminum alloy plate materials of body of a motor car according to claim 1, it is characterised in that institute State 6009 aluminium alloy cast ingots before heating, by cutting off milling surface treatment, hot rolling mode is combined for cross rolling with longitudinally rolling, Course of hot rolling first rolls 3~5 passages along ingot casting width direction, rolls 10~15 passages then along slab ingot length direction, obtains Obtain hot rolled plate.

A kind of 5. preparation method of 6009 aluminum alloy plate materials of body of a motor car according to claim 1, it is characterised in that institute The 6009 aluminium alloy cast ingot thickness stated are 170mm, and hot rolling plate thickness is 4~7mm, 0.8~1.2mm of Cold Rolled Plate Thickness.

A kind of 6. preparation method of 6009 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 6009 aluminum alloy plate materials：σ_0.2=120~126MPa, σ_b=229~235MPa, r₁₅ =0.72~0.81, n=0.25~0.27, δ=27.3~29.8%, I_E=8.70~9.08mm.

A kind of 7. preparation method of 6009 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 6009 aluminum alloy plate materials：σ_0.2=217~230MPa, σ_b=288 ~297MPa, δ=19.0~22.0%.