阅读说明：本技术 一种改善5系铝合金带材表面冲制吕德斯带的制造方法 (Manufacturing method for improving punching Luders belt on surface of 5-series aluminum alloy strip ) 是由 陈博宇 徐宏大 万旭 谭树栋 赵国奇 车德财 刘玉龙 刘世雷 于 2020-12-14 设计创作，主要内容包括：一种改善5系铝合金带材表面冲制吕德斯带的制造方法,它涉及一种5系铝合金带材的制造方法。本发明的目的是要解决现有方法制备的铝合金带材产生吕德斯带导致力学性能低,不满足用户使用的问题。方法：一、称料；二、熔炼；三、铸造；四、加热；五、热轧；六、冷轧；七、退火；八、继续冷轧；九、继续退火。本发明制得的铝合金带材的抗拉强度为210MPa～230MPa,屈服强度为80MPa～90MPa,延伸率为18％～20％,符合用户要求。(A manufacturing method for improving a punched Luders strip on the surface of a 5-series aluminum alloy strip relates to a manufacturing method of a 5-series aluminum alloy strip. The invention aims to solve the problems that the aluminum alloy strip prepared by the existing method generates a Luders strip, so that the mechanical property is low and the use by a user is not satisfied. The method comprises the following steps: firstly, weighing materials; secondly, smelting; thirdly, casting; fourthly, heating; fifthly, hot rolling; sixthly, cold rolling; seventhly, annealing; eighthly, continuously cold rolling; and ninthly, continuously annealing. The tensile strength of the aluminum alloy strip prepared by the invention is 210 MPa-230 MPa, the yield strength is 80 MPa-90 MPa, and the elongation is 18% -20%, thus meeting the requirements of users.)

1. A manufacturing method for improving the punching Luders strip on the surface of a 5-series aluminum alloy strip is characterized in that the manufacturing method for improving the punching Luders strip on the surface of the 5-series aluminum alloy strip is completed according to the following steps:

firstly, weighing materials:

weighing raw materials for improving the punching of the Luders belt on the surface of the 5-series aluminum alloy strip; the raw materials for improving the punching of the Luders strip on the surface of the 5-series aluminum alloy strip comprise, by weight, 0.1% of Cu, 0.005% of Ni, 0.15% of Zn, 0.015% of Ti, 0.2% -0.3% of Mn, 2.8% -3.4% of Mg, 0.3% of Si, 0.3% of Fe and the balance of Al;

secondly, smelting:

smelting the raw material for punching the Luders belt on the surface of the 5-series aluminum alloy strip weighed in the step one to obtain an aluminum alloy solution;

thirdly, preparing the aluminum alloy solution obtained in the second step into an aluminum alloy ingot under the conditions that the casting temperature is 680-720 ℃, the casting speed is 55-60 mm/min, the casting cooling water pressure is 0.003-0.1 MPa and the cooling water temperature is 20-26 ℃;

fourthly, placing the aluminum alloy ingot obtained in the third step into a heating furnace for heating to obtain a heated aluminum alloy ingot;

fifthly, hot rolling the heated aluminum alloy cast ingot to a thickness of 3.9-4.1 mm to obtain a hot-rolled intermediate blank;

sixthly, cooling the hot-rolled intermediate blank to room temperature, and then performing cold rolling to 1-1.2 mm to obtain a cold-rolled intermediate blank;

seventhly, putting the cold-rolled intermediate blank into a furnace with the temperature of 320-330 ℃ for annealing for 1-1.5 h to obtain an annealed cold-rolled intermediate blank;

eighthly, rolling the annealed cold-rolled intermediate blank to a thickness of 0.7-0.9 mm to obtain a strip with a thickness of 0.7-0.9 mm;

and ninthly, putting the strip with the thickness of 0.7-0.9 mm obtained in the step eight into a furnace with the temperature of 320-330 ℃ for annealing for 1-1.5 h, discharging and air cooling to obtain the aluminum alloy strip, namely completing the manufacturing method for improving the punching of the Luders strip on the surface of the 5-series aluminum alloy strip.

2. The method as claimed in claim 1, wherein the raw material for improving the punching Luders strip on the surface of the 5-series aluminum alloy strip in the step one comprises, by weight, 0.1% Cu, 0.005% Ni, 0.15% Zn, 0.015% Ti, 0.25% Mn, 3.1% Mg, 0.3% Si, 0.3% Fe and the balance Al.

3. The manufacturing method for improving the surface punching Luders strip of the 5-series aluminum alloy strip according to the claim 1, wherein the raw material for improving the surface punching Luders strip of the 5-series aluminum alloy strip weighed in the step one is smelted at 660-680 ℃ in the step two to obtain the aluminum alloy solution.

4. The method for manufacturing the improved luders strip on the surface of the 5-series aluminum alloy strip according to claim 1, wherein the aluminum alloy solution obtained in the second step is manufactured into the aluminum alloy ingot in the third step under the conditions that the casting temperature is 690 ℃, the casting speed is 55mm/min, the casting cooling water pressure is 0.006MPa, and the cooling water temperature is 24 ℃.

5. The manufacturing method of improving the punching Luders strip on the surface of the 5-series aluminum alloy strip according to claim 1, wherein in the fourth step, the aluminum alloy ingot obtained in the third step is firstly placed at the temperature of 530-560 ℃ and heated for 5-6 h, and then placed at the temperature of 450-470 ℃ and heated for 28-30 h, so as to obtain the heated aluminum alloy ingot.

6. The method for manufacturing the improved Luders strip on the surface of the 5-series aluminum alloy strip according to claim 5, wherein in the fourth step, the aluminum alloy ingot obtained in the third step is firstly placed at 560 ℃ and heated for 5.5h, and then placed at 470 ℃ and heated for 29h, so that the heated aluminum alloy ingot is obtained.

7. The method for improving the surface punching Luders' strip of 5-series aluminum alloy strip according to claim 1, wherein in the fifth step, the heated aluminum alloy ingot is hot rolled to a thickness of 4.0mm to obtain a hot rolled intermediate billet.

8. The manufacturing method of improving the surface punching Luders strip of the 5-series aluminum alloy strip according to the claim 1, wherein the hot-rolled intermediate blank is cooled to room temperature in the sixth step, and then is subjected to cold rolling to 1.1mm, so as to obtain the cold-rolled intermediate blank.

9. The method for manufacturing improved 5-series aluminum alloy strip surface punching Luders' belt as claimed in claim 1, wherein the annealed cold-rolled intermediate blank is rolled to a thickness of 0.8mm in step eight, so as to obtain a strip with a thickness of 0.8 mm.

10. The manufacturing method of improving the surface punched Luders strip of the 5 series aluminum alloy strip according to the claim 1, wherein the strip with the thickness of 0.7mm to 0.9mm obtained in the step eight in the step nine is placed into a furnace with the temperature of 325 ℃ for annealing for 1h, discharged from the furnace and cooled in air, so as to obtain the aluminum alloy strip, and the manufacturing method of improving the surface punched Luders strip of the 5 series aluminum alloy strip is completed.

Technical Field

The invention relates to a method for manufacturing a 5-series aluminum alloy strip.

Background

The main additive element of the 5-series aluminum alloy is Mg element, the Mg element of the annealed 5-series aluminum alloy which is dissolved in a matrix is easy to nail roll at a dislocation to form a Cocker air mass, and at the initial stage of stamping deformation, the interaction of the air mass and the dislocation causes the annealed 5-series aluminum alloy to have upper and lower yield points and yield platforms on a stress-strain curve, and macroscopically a Luders.

Disclosure of Invention

The invention aims to solve the problems that the mechanical property of an aluminum alloy strip prepared by the existing method is low and the use of the aluminum alloy strip by a user is not satisfied, and provides a manufacturing method for improving a punched Luders strip on the surface of a 5-series aluminum alloy strip.

A manufacturing method for improving a punched Luders strip on the surface of a 5-series aluminum alloy strip is completed according to the following steps:

firstly, weighing materials:

weighing raw materials for improving the punching of the Luders belt on the surface of the 5-series aluminum alloy strip; the raw materials for improving the punching of the Luders strip on the surface of the 5-series aluminum alloy strip comprise, by weight, 0.1% of Cu, 0.005% of Ni, 0.15% of Zn, 0.015% of Ti, 0.2% -0.3% of Mn, 2.8% -3.4% of Mg, 0.3% of Si, 0.3% of Fe and the balance of Al;

secondly, smelting:

smelting the raw material for punching the Luders belt on the surface of the 5-series aluminum alloy strip weighed in the step one to obtain an aluminum alloy solution;

thirdly, preparing the aluminum alloy solution obtained in the second step into an aluminum alloy ingot under the conditions that the casting temperature is 680-720 ℃, the casting speed is 55-60 mm/min, the casting cooling water pressure is 0.003-0.1 MPa and the cooling water temperature is 20-26 ℃;

fourthly, placing the aluminum alloy ingot obtained in the third step into a heating furnace for heating to obtain a heated aluminum alloy ingot;

fifthly, hot rolling the heated aluminum alloy cast ingot to a thickness of 3.9-4.1 mm to obtain a hot-rolled intermediate blank;

sixthly, cooling the hot-rolled intermediate blank to room temperature, and then performing cold rolling to 1-1.2 mm to obtain a cold-rolled intermediate blank;

seventhly, putting the cold-rolled intermediate blank into a furnace with the temperature of 320-330 ℃ for annealing for 1-1.5 h to obtain an annealed cold-rolled intermediate blank;

eighthly, rolling the annealed cold-rolled intermediate blank to a thickness of 0.7-0.9 mm to obtain a strip with a thickness of 0.7-0.9 mm;

and ninthly, putting the strip with the thickness of 0.7-0.9 mm obtained in the step eight into a furnace with the temperature of 320-330 ℃ for annealing for 1-1.5 h, discharging and air cooling to obtain the aluminum alloy strip, namely completing the manufacturing method for improving the punching of the Luders strip on the surface of the 5-series aluminum alloy strip.

Compared with the prior art, the invention has the advantages that:

the invention adopts 5 series Al-Mg alloy, takes 0.1 percent of Cu, 0.005 percent of Ni, 0.15 percent of Zn, 0.015 percent of Ti, 0.2 to 0.3 percent of Mn, 2.8 to 3.4 percent of Mg, 0.3 percent of Si, 0.3 percent of Fe and the balance of Al as smelting raw materials to cast, and manufactures finished products through working procedures of hot rolling, cold rolling, annealing and the like, the influence of different cold deformation degrees and annealing temperatures on the grain size in the product structure is simultaneously explored, technical parameters are provided for large-scale production, the control difficulty is relatively low, the product quality is stable, and the requirements of users on the product can be met.

Drawings

FIG. 1 is a polarized photograph of punched Luders' bands on the surface of the improved 5-series aluminum alloy strip prepared in example 1.

Detailed Description

The first embodiment is as follows: the embodiment is a manufacturing method for improving a punched Luders strip on the surface of a 5-series aluminum alloy strip, which is completed by the following steps:

firstly, weighing materials:

weighing raw materials for improving the punching of the Luders belt on the surface of the 5-series aluminum alloy strip; the raw materials for improving the punching of the Luders strip on the surface of the 5-series aluminum alloy strip comprise, by weight, 0.1% of Cu, 0.005% of Ni, 0.15% of Zn, 0.015% of Ti, 0.2% -0.3% of Mn, 2.8% -3.4% of Mg, 0.3% of Si, 0.3% of Fe and the balance of Al;

secondly, smelting:

smelting the raw material for punching the Luders belt on the surface of the 5-series aluminum alloy strip weighed in the step one to obtain an aluminum alloy solution;

thirdly, preparing the aluminum alloy solution obtained in the second step into an aluminum alloy ingot under the conditions that the casting temperature is 680-720 ℃, the casting speed is 55-60 mm/min, the casting cooling water pressure is 0.003-0.1 MPa and the cooling water temperature is 20-26 ℃;

fourthly, placing the aluminum alloy ingot obtained in the third step into a heating furnace for heating to obtain a heated aluminum alloy ingot;

fifthly, hot rolling the heated aluminum alloy cast ingot to a thickness of 3.9-4.1 mm to obtain a hot-rolled intermediate blank;

sixthly, cooling the hot-rolled intermediate blank to room temperature, and then performing cold rolling to 1-1.2 mm to obtain a cold-rolled intermediate blank;

seventhly, putting the cold-rolled intermediate blank into a furnace with the temperature of 320-330 ℃ for annealing for 1-1.5 h to obtain an annealed cold-rolled intermediate blank;

eighthly, rolling the annealed cold-rolled intermediate blank to a thickness of 0.7-0.9 mm to obtain a strip with a thickness of 0.7-0.9 mm;

and ninthly, putting the strip with the thickness of 0.7-0.9 mm obtained in the step eight into a furnace with the temperature of 320-330 ℃ for annealing for 1-1.5 h, discharging and air cooling to obtain the aluminum alloy strip, namely completing the manufacturing method for improving the punching of the Luders strip on the surface of the 5-series aluminum alloy strip.

The advantages of this embodiment over the prior art are:

in the embodiment, a 5-series Al-Mg alloy is adopted, 0.1 percent of Cu, 0.005 percent of Ni, 0.15 percent of Zn, 0.015 percent of Ti, 0.2 percent to 0.3 percent of Mn, 2.8 percent to 3.4 percent of Mg, 0.3 percent of Si, 0.3 percent of Fe and the balance of Al are taken as smelting raw materials to be cast, and a finished product is manufactured through the working procedures of hot rolling, cold rolling, annealing and the like, the influence of different cold deformation degrees and annealing temperatures on the grain size of the product structure is explored, technical parameters are provided for large-scale production, the control difficulty is relatively low, the product quality is stable, and the requirements of users on the product can be met.

The second embodiment is as follows: the present embodiment differs from the present embodiment in that: in the first step, the raw materials for improving the punching of the Luders strip on the surface of the 5-series aluminum alloy strip comprise, by weight, 0.1% of Cu, 0.005% of Ni, 0.15% of Zn, 0.015% of Ti, 0.25% of Mn, 3.1% of Mg, 0.3% of Si, 0.3% of Fe and the balance of Al. Other steps are the same as in the first embodiment.

The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: and in the second step, the raw material for punching the Luders belt on the surface of the improved 5-series aluminum alloy strip weighed in the first step is smelted at 660-680 ℃ to obtain an aluminum alloy solution. The other steps are the same as in the first or second embodiment.

The fourth concrete implementation mode: the difference between this embodiment and one of the first to third embodiments is as follows: and step three, preparing the aluminum alloy solution obtained in the step two into an aluminum alloy ingot under the conditions that the casting temperature is 690 ℃, the casting speed is 55mm/min, the casting cooling water pressure is 0.006MPa and the cooling water temperature is 24 ℃. The other steps are the same as those in the first to third embodiments.

The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: in the fourth step, the aluminum alloy ingot obtained in the third step is firstly placed at the temperature of 530-560 ℃ for heating for 5-6 h, and then placed at the temperature of 450-470 ℃ for heating for 28-30 h, so that the heated aluminum alloy ingot is obtained. The other steps are the same as those in the first to fourth embodiments.

The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is as follows: in the fourth step, the aluminum alloy ingot obtained in the third step is firstly placed at the temperature of 560 ℃ to be heated for 5.5h, and then placed at the temperature of 470 ℃ to be heated for 29h, so that the heated aluminum alloy ingot is obtained. The other steps are the same as those in the first to fifth embodiments.

The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is: and step five, hot rolling the heated aluminum alloy ingot to the thickness of 4.0mm to obtain a hot-rolled intermediate blank. The other steps are the same as those in the first to sixth embodiments.

The specific implementation mode is eight: the difference between this embodiment and one of the first to seventh embodiments is: and step six, cooling the hot-rolled intermediate blank to room temperature, and then carrying out cold rolling to 1.1mm to obtain the cold-rolled intermediate blank. The other steps are the same as those in the first to seventh embodiments.

The specific implementation method nine: the difference between this embodiment and the first to eighth embodiments is: and step eight, rolling the annealed cold-rolled intermediate blank to the thickness of 0.8mm to obtain the strip with the thickness of 0.8 mm. The other steps are the same as those in the first to eighth embodiments.

The detailed implementation mode is ten: the difference between this embodiment and one of the first to ninth embodiments is as follows: and step nine, putting the strip with the thickness of 0.7 mm-0.9 mm obtained in the step eight into a furnace with the temperature of 325 ℃ for annealing for 1 hour, discharging and air-cooling to obtain an aluminum alloy strip, and thus completing the manufacturing method for improving the punched Luders strip on the surface of the 5-series aluminum alloy strip. The other steps are the same as those in the first to ninth embodiments.

The following examples were used to demonstrate the beneficial effects of the present invention:

example 1: a manufacturing method for improving a punched Luders strip on the surface of a 5-series aluminum alloy strip is completed according to the following steps:

firstly, weighing materials:

weighing raw materials for improving the punching of the Luders belt on the surface of the 5-series aluminum alloy strip; the raw materials for improving the punching of the Luders strip on the surface of the 5-series aluminum alloy strip comprise, by weight, 0.1% of Cu, 0.005% of Ni, 0.15% of Zn, 0.015% of Ti, 0.25% of Mn, 3.1% of Mg, 0.3% of Si, 0.3% of Fe and the balance of Al;

secondly, smelting:

smelting the raw material for punching the Luders belt on the surface of the 5-series aluminum alloy strip weighed in the step one at 670 ℃ to obtain an aluminum alloy solution;

thirdly, preparing the aluminum alloy solution obtained in the second step into an aluminum alloy ingot under the conditions that the casting temperature is 690 ℃, the casting speed is 55mm/min, the casting cooling water pressure is 0.006MPa and the cooling water temperature is 24 ℃;

fourthly, firstly heating the aluminum alloy ingot obtained in the third step at the temperature of 560 ℃ for 5.5 hours, and then heating the aluminum alloy ingot at the temperature of 470 ℃ for 29 hours to obtain a heated aluminum alloy ingot;

fifthly, hot rolling the heated aluminum alloy ingot to a thickness of 4.0mm to obtain a hot-rolled intermediate blank;

sixthly, cooling the hot-rolled intermediate blank to room temperature, and then performing cold rolling to 1.1mm to obtain a cold-rolled intermediate blank;

seventhly, putting the cold-rolled intermediate blank into a furnace with the temperature of 325 ℃ for annealing for 1h to obtain an annealed cold-rolled intermediate blank;

eighthly, rolling the annealed cold-rolled intermediate blank to the thickness of 0.8mm to obtain a strip with the thickness of 0.8 mm;

and ninthly, putting the strip with the thickness of 0.8mm obtained in the step eight into a furnace with the temperature of 325 ℃ for annealing for 1-1.5 h, discharging and air cooling to obtain an aluminum alloy strip, namely completing the manufacturing method for improving the surface punching of the 5-series aluminum alloy strip to obtain the Luders strip.

The aluminium alloy strip produced in example 1 was sampled and compared for mechanical properties (see table 1).

Table 1 results of mechanical property measurements of the first prepared aluminum alloy strip

Serial number	Yield strength/MPa	Tensile strength/MPa	Elongation/percent
				1	87	224	18
2	87	224	20
				3	86	225	20
Mean value of	86.6	224.3	19.3

As can be seen from Table 1, the first example has required tensile strength of 190-240 MPa, yield strength of 80MPa or more, elongation of 14% or more,

FIG. 1 is a polarized photograph of punched Luders' bands on the surface of the improved 5-series aluminum alloy strip prepared in example 1.

As can be seen from FIG. 1, the aluminum alloy strip produced in example 1 was relatively uniform in grain size, measured between 140 μm and 160 μm, and was relatively large in grain size, effectively preventing the generation of surface punched Luders' bands.