CN109136628A - A kind of hot rolling technology of 6xxx aluminium alloy - Google Patents

Abstract

A kind of hot rolling technology of 6xxx aluminium alloy provided by the present invention, rolling deformation and quenching are combined into one, carry out solution treatment before rolling, are being rolled while being quenched；During the rolling process, it heats and is contacted between workpiece and chill roll, workpiece is made to generate a large amount of heat loss, along with rolling deformation while workpiece temperature declines rapidly, effectively quenching and limitation thermal distoftion are realized using roll cooling；After the present invention can effectively solve the problem that temperature-room type plasticity difference and roll the problem of heat-treatment distortion, and obtained product forming property with higher, strengthening effect and dimensional accuracy；Meanwhile a kind of and short flow process.

Description

A kind of hot rolling technology of 6xxx aluminium alloy

Technical field

The present invention relates to aluminium alloy manufacturing technology fields, particularly belong to a kind of hot rolling technology of 6xxx aluminium alloy.

Background technique

6xxx aluminium alloy has been widely used in vapour due to well-known with good mechanical performance and chemical property Vehicle, space flight and building trade.In the production process of aluminium plate, conventional rolling mill practice is (1) Homogenization Treatments；(2) multiple tracks Secondary cold rolling；(3) recrystallization annealing and solution treatment；(4) artificial aging.

And existing rolling mill practice the problem of there is also following several respects: (1) temperature-room type plasticity is poor, it is difficult to shape complicated shape Component；(2) rebound is big, and Components Shape dimensional accuracy is difficult to be guaranteed；(3) it when being heat-treated after shaping, is heated or cooled It is easy uneven heating in the process and leads to part shape change in size.In the prior art, also occur corresponding solving the problems, such as to do Method, for example, in order to solve the problems, such as that plasticity is poor, rebound is big plasticity and decreasing rebound can be improved by heating；But pass through Forming temperature is improved to improve plasticity and decreasing rebound, formation of parts still needs to heat treatment to improve intensity, and heat-treatment distortion is asked Topic is not resolved yet.

Summary of the invention

The purpose of the present invention is to provide a kind of hot rolling technologies of 6xxx aluminium alloy, have 6xxx alloy product to reach There is the purpose of higher forming property, strengthening effect and dimensional accuracy.

A kind of hot rolling technology of 6xxx aluminium alloy, comprising the following steps:

Step 1: melting Al6061 alloy simultaneously adds nano-TiC particle inovulant: by machine after Al6061 alloy is melted Tool stirs 2min, then blowing argon gas purifies 1min, removes the gred later, 780-820 DEG C of heat preservation after slagging-off, by nano-TiC particle It is added in solution, additive amount is the 0.2%-1% of solution quality, is kept the temperature after ultrasonic disperse at 800 DEG C, and soaking time is Then 10-15min is cast into aluminium alloy cast ingot；

Step 2: Homogenization Treatments being carried out to aluminium alloy cast ingot, heating temperature is 550 DEG C -580 DEG C, heating time 6h- 8h；

Step 3: step 2 products obtained therefrom being put into heating furnace and is evenly heated, heating temperature is 490 DEG C -580 DEG C, heating Time is 0.5h-1h；

Step 4: the aluminium ingot taken out in heating is rolled immediately, as a time, and heating workpiece is rapid simultaneously in rolling 200 DEG C are cooled to hereinafter, completing rolling, quenching；

Step 5: step 4 products obtained therefrom being subjected to natrual ageing or artificial aging: carrying out condition when natrual ageing are as follows: temperature Degree is 18-28 DEG C, time 9-11h；Carry out condition when artificial aging are as follows: temperature is 170-190 DEG C, time 30- 90min；Obtain product of the present invention.

Preferably, in the step 1, nano-TiC particle before addition, is preheated to 450 DEG C -550 DEG C.

Preferably, described a time rolling is to be rolled down to 0.5-2mm from 3-10mm.

Above-mentioned Al6061 alloy is provided by upper Hisense Ran metal material Co., Ltd

Beneficial effects of the present invention:

6xxx aluminum alloy heat roll process provided by the present invention, rolling deformation and quenching is combined into one, before rolling Solution treatment is carried out, is rolling while being quenched；During the rolling process, it heats and is contacted between workpiece and chill roll, make workpiece A large amount of heat loss is generated, along with rolling deformation while workpiece temperature declines rapidly, has been realized using roll cooling Effect quenching and limitation thermal distoftion；After the present invention can effectively solve the problem that temperature-room type plasticity difference and roll the problem of heat-treatment distortion, and Obtained product forming property, strengthening effect and dimensional accuracy with higher；Meanwhile a kind of and short route preparation side Method.

Detailed description of the invention

Fig. 1 is temperature variation in hot rolling technology of the invention；

Fig. 2 is that the ess-strain that the room temperature of the plate of embodiment 1 to 3 and conventional cold rolling heat treatment method preparation stretches is bent Line；

Fig. 3 is 6xxx aluminium alloy respective organization area percentage figure prepared by embodiment 3；

Fig. 4 is the transmission electron micrograph of the nano-diffusion phase of 6xxx aluminium alloy prepared by embodiment 2 and 3.

Specific embodiment

Particular content of the invention is further illustrated below with reference to example；

Embodiment 1:

A kind of hot rolling technology of 6xxx aluminium alloy, comprising the following steps:

Step 1: melting Al6061 alloy simultaneously adds nano-TiC particle inovulant: Al6061 alloy is upper Hisense Ran metal Commercial product provided by Materials Co., Ltd；Pass through self- propagating fabricated in situ matter according to patent ZL201110209567.6 technology Amount score is 30%TiC-Al6061 intermediate alloy；Inovulant is done using nano TiC, by machinery after Al6061 alloy is melted 2min, blowing argon gas purification 1min, slagging-off, 800 DEG C of heat preservations are stirred, the nano-TiC particle that 500 DEG C are preheated is added in solution, adds Dosage is that the diameter of 0.3%, the TiC particle of solution quality is 60-90 nanometers；It is kept the temperature after ultrasonic disperse at 800 DEG C Then 12min is cast into aluminium alloy cast ingot；

Step 2: Homogenization Treatments being carried out to aluminium ingot casting, heating temperature is 570 DEG C, heating time 6h, furnace cooling；

Step 3: step 2 products obtained therefrom being put into heating furnace and is evenly heated, heating temperature is 500 DEG C, and heating time is 1h；

Step 4: the aluminium ingot taken out in heating is rolled (a time) immediately, and heating workpiece is in rolling cooling rapidly simultaneously To 190 DEG C, rolling, quenching are completed, is rolled down to 1mm from 6mm；

Rolled parts is done artificial aging by step 5, and aging temp is 170 DEG C, aging time 30min.

Curve a in the stress-strain diagram such as Fig. 2 that the room temperature of embodiment 1 stretches, can obtain: produced by the present invention from Fig. 2 6xxx alloy intensity with higher, tensile strength 302MPa；Workflow is being reduced compared to the plate of common process preparation Under conditions of tensile strength improve 11%.

Embodiment 2:

A kind of hot rolling technology of 6xxx aluminium alloy, comprising the following steps:

Step 1: melting Al6061 alloy simultaneously adds nano-TiC particle inovulant: inovulant is made using nano TiC, by quotient By mechanical stirring 2min, blowing argon gas purification 1min, slagging-off, 780 DEG C of heat preservations after being melted with Al6061 alloy, 450 DEG C are preheated Nano-TiC particle be added solution in, additive amount be solution quality 0.5%, after ultrasonic disperse 800 DEG C keep the temperature Then 10min is cast into aluminium alloy cast ingot；

Step 2:: Homogenization Treatments are carried out to aluminium ingot casting, heating temperature is 550 DEG C, heating time 7h, furnace cooling；

Step 3: step 2 products obtained therefrom being put into heating furnace and is evenly heated, heating temperature is 560 DEG C, and heating time is 0.8h；

Step 4: the aluminium ingot taken out in heating is rolled (a time) immediately, and heating workpiece is in rolling cooling rapidly simultaneously To 200 DEG C, rolling, quenching are completed, is rolled down to 2mm from 5.4mm；

Step 5: by rolled parts artificial aging, aging temp is 180 DEG C, aging time 1h.

Curve b in the room temperature tensile stress strain curve such as Fig. 2 of embodiment 2, it can be obtained from Fig. 2: produced by the present invention 6xxx alloy intensity with higher, tensile strength 365MPa；Workflow is being reduced compared to the plate of common process preparation Under conditions of tensile strength improve 34.2%.

Embodiment 3:

The hot rolling technology of 6xxx aluminium alloy provided in an embodiment of the present invention, the following steps are included:

Step 1: melting Al6061 alloy simultaneously adds nano-TiC particle inovulant: inovulant is made using nano TiC, by quotient By mechanical stirring 2min, blowing argon gas purification 1min, slagging-off, 820 DEG C of heat preservations after being melted with Al6061 alloy, 550 DEG C are preheated Nano-TiC particle be added solution in, additive amount be solution quality 1%, 15min is kept the temperature after ultrasonic disperse, is then poured Cast aluminium alloy cast ingot；

Step 2: Homogenization Treatments being carried out to aluminium ingot casting, heating temperature is 580 DEG C, heating time 8h, furnace cooling；

Step 3: step 2 products obtained therefrom being put into heating furnace and is evenly heated, heating temperature is 580 DEG C, and heating time is 0.5h；

Step 4: the aluminium ingot taken out in heating is rolled (a time) immediately, and heating workpiece is in rolling cooling rapidly simultaneously To 198 DEG C, rolling, quenching are completed, is rolled down to 0.5mm from 5.0mm；

Step 5: by rolled parts natrual ageing, placing 10h in air, temperature is 23-27 DEG C.

The room temperature tensile stress strain curve of embodiment 3 such as Fig. 2 curve c, it can be obtained from Fig. 2: 6xxx produced by the present invention Alloy intensity with higher, tensile strength 320MPa；Compared to common process preparation plate reduce workflow item Tensile strength improves 18% under part.And product of the present invention during the rolling process can be obtained by Fig. 3 and will appear reply tissue, cause back Multiple softening, makes material have good plasticity.After rolling available from figure 4, embodiment 2 and 3 product of embodiment, natrual ageing analysis Evenly dispersed precipitated phase is precipitated later in few precipitated phase out, artificial aging, also illustrates to cool down rapidly during the rolling process solid It is molten to work well.

Claims (3)

1. a kind of hot rolling technology of 6xxx aluminium alloy, which comprises the following steps:

Step 1: melting Al6061 alloy simultaneously adds nano-TiC particle inovulant: stirring after Al6061 alloy is melted by machinery 2min is mixed, then blowing argon gas purifies 1min, removes the gred later, 780-820 DEG C of heat preservation, nano-TiC particle is added after slagging-off In solution, additive amount is the 0.2%-1% of solution quality, is kept the temperature after ultrasonic disperse at 800 DEG C, soaking time 10- Then 15min is cast into aluminium alloy cast ingot；

Step 2: Homogenization Treatments being carried out to aluminium alloy cast ingot, heating temperature is 550 DEG C -580 DEG C, heating time 6h-8h；

Step 3: step 2 products obtained therefrom being put into heating furnace and is evenly heated, heating temperature is 490 DEG C -580 DEG C, heating time For 0.5h-1h；

Step 4: the aluminium ingot taken out in heating is rolled immediately, as a time, and heating workpiece is in rolling cooling rapidly simultaneously To 200 DEG C hereinafter, completing rolling, quenching；

Step 5: step 4 products obtained therefrom being subjected to natrual ageing or artificial aging: carrying out condition when natrual ageing are as follows: temperature is 18-28 DEG C, time 9-11h；Carry out condition when artificial aging are as follows: temperature is 170-190 DEG C, time 30-90min；I.e. Obtain product of the present invention.

2. the hot rolling technology of 6xxx aluminium alloy according to claim 1, which is characterized in that in the step 1, nano TiC Particle before addition, is preheated to 450 DEG C -550 DEG C.

3. the hot rolling technology of 6xxx aluminium alloy according to claim 1, which is characterized in that described a time rolling be from 3-10mm is rolled down to 0.5-2mm.