阅读说明：本技术 新能源汽车电池箱体用铝合金及其生产方法 (Aluminum alloy for new energy automobile battery box and production method thereof ) 是由 孙雯娜 陈登斌 曹城 凌侦靖 邱洪龙 于 2020-06-24 设计创作，主要内容包括：本发明提供了一种新能源汽车电池箱体用铝合金及其生产方法,其中各组分的质量百分比为：硅0.2％-0.6％、铁0.05％-0.10％、铜0.05％-0.12％、钛0.005％-0.04％、锰0.10％-0.30％、镁3.2％-4.2％、锌≤0.02％,余量为铝和不可避免杂质；生产其铝合金步骤为：配料,然后进行熔炼、除渣以及铸造形成铝合金铸锭,将铝合金铸锭进行均匀化退火、热轧、冷轧、成品退火以及风冷处理得到新能源汽车电池箱体用铝合金板材。与相关技术相比,本发明利用此生产方法制得的新能源汽车电池箱体用铝合金易成型且强度高。(The invention provides an aluminum alloy for a new energy automobile battery box body and a production method thereof, wherein the aluminum alloy comprises the following components in percentage by mass: 0.2 to 0.6 percent of silicon, 0.05 to 0.10 percent of iron, 0.05 to 0.12 percent of copper, 0.005 to 0.04 percent of titanium, 0.10 to 0.30 percent of manganese, 3.2 to 4.2 percent of magnesium, less than or equal to 0.02 percent of zinc, and the balance of aluminum and inevitable impurities; the aluminum alloy production steps are as follows: the preparation method comprises the following steps of proportioning, smelting, deslagging and casting to form an aluminum alloy ingot, and carrying out homogenization annealing, hot rolling, cold rolling, finished product annealing and air cooling treatment on the aluminum alloy ingot to obtain the aluminum alloy plate for the new energy automobile battery box. Compared with the prior art, the aluminum alloy for the new energy automobile battery box prepared by the production method is easy to form and high in strength.)

1. A production method of an aluminum alloy for a new energy automobile battery box body is characterized by comprising the following steps:

step S1, batching: the aluminum alloy material is prepared from the following components in percentage by mass: 0.2 to 0.6 percent of silicon, 0.05 to 0.10 percent of iron, 0.05 to 0.12 percent of copper, 0.005 to 0.04 percent of titanium, 0.10 to 0.30 percent of manganese, 3.2 to 4.2 percent of magnesium, less than or equal to 0.02 percent of zinc, and the balance of aluminum and inevitable impurities;

step S2, smelting, deslagging and casting: putting the aluminum alloy raw material into a smelting furnace for smelting to prepare an aluminum alloy melt; when the temperature of the aluminum alloy melt reaches 720-750 ℃, refining; degassing and deslagging the refined aluminum alloy melt, and casting the degassed and descaled aluminum alloy melt in a semi-continuous casting machine to obtain an aluminum alloy slab ingot;

step S3, homogenizing annealing: raising the temperature to enable the temperature of the aluminum alloy slab ingot to reach 450-550 ℃, and preserving the heat for 5-20 h;

step S4, hot rolling: carrying out hot rolling on the aluminum alloy slab ingot subjected to the homogenizing annealing treatment to obtain a hot rolled coil, wherein the finish rolling temperature is 260-330 ℃;

step S5, cold rolling, finished product annealing and air cooling treatment: and sequentially carrying out cold rolling, finished product annealing and air cooling treatment on the hot rolled coil to obtain the aluminum alloy plate for the new energy automobile battery box.

2. The production method of the aluminum alloy for the battery box of the new energy automobile as claimed in claim 1, wherein the temperature of the melting furnace is 1050 ℃ to 1150 ℃ when the melting in step S2 is performed.

3. The method for producing the aluminum alloy for the battery box of the new energy automobile according to claim 1, wherein the aluminum alloy melt is filtered by an online filtering system of plate filtration and deep bed filtration when refining in the step S2.

4. The method for producing the aluminum alloy for the battery box of the new energy automobile as recited in claim 1, wherein in the step S2, when degassing and deslagging are performed, online degassing and deslagging are performed by using a degassing tank and a filter tank.

5. The method for producing the aluminum alloy for the battery box of the new energy automobile as recited in claim 1, wherein in the step S5, the annealing temperature of the finished product is 350 ℃ to 450 ℃.

6. The method for producing the aluminum alloy for the battery box of the new energy automobile as claimed in claim 1, wherein in the step S5, the tapping temperature of the finished product after annealing is 350-450 ℃.

7. The method for producing the aluminum alloy for the battery box of the new energy automobile according to claim 1, wherein in the step S5, the cooling rate is greater than or equal to 10 ℃/sec when the air cooling treatment is performed.

8. The aluminum alloy for the battery box body of the new energy automobile is characterized by comprising the following components in percentage by mass: 0.2 to 0.6 percent of silicon, 0.05 to 0.10 percent of iron, 0.05 to 0.12 percent of copper, 0.005 to 0.04 percent of titanium, 0.10 to 0.30 percent of manganese, 3.2 to 4.2 percent of magnesium, less than or equal to 0.02 percent of zinc, and the balance of aluminum and inevitable impurities.

9. The aluminum alloy for the battery box body of the new energy automobile as claimed in claim 9, wherein the aluminum alloy for the battery box body of the new energy automobile is prepared by the production method of the aluminum alloy for the battery box body of the new energy automobile as claimed in any one of claims 1 to 7.

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of aluminum alloy for a new energy automobile battery box body, in particular to aluminum alloy for a new energy automobile battery box body and a production method thereof.

[ background of the invention ]

In recent years, with the development of new energy automobiles, the battery industry as the core is also developed; the energy density becomes the standard for measuring the quality of the battery, so the light weight of the battery box is more and more emphasized by people, and the raw material for manufacturing the battery box is aluminum alloy.

[ summary of the invention ]

The invention aims to provide an aluminum alloy for a new energy automobile battery box, which is easy to mold and high in strength, and a production method thereof.

In order to achieve the aim, the invention provides a production method of an aluminum alloy for a battery box body of a new energy automobile, which comprises the following steps:

step S1, batching: the aluminum alloy material is prepared from the following components in percentage by mass: 0.2 to 0.6 percent of silicon, 0.05 to 0.10 percent of iron, 0.05 to 0.12 percent of copper, 0.005 to 0.04 percent of titanium, 0.10 to 0.30 percent of manganese, 3.2 to 4.2 percent of magnesium, less than or equal to 0.02 percent of zinc, and the balance of aluminum and inevitable impurities;

step S2, smelting, deslagging and casting: putting the aluminum alloy raw material into a smelting furnace for smelting to prepare an aluminum alloy melt; when the temperature of the aluminum alloy melt reaches 720-750 ℃, refining; degassing and deslagging the refined aluminum alloy melt, and casting the degassed and descaled aluminum alloy melt in a semi-continuous casting machine to obtain an aluminum alloy slab ingot;

step S3, homogenizing annealing: raising the temperature to enable the temperature of the aluminum alloy slab ingot to reach 450-550 ℃, and preserving the heat for 5-20 h;

step S4, hot rolling: carrying out hot rolling on the aluminum alloy slab ingot subjected to the homogenizing annealing treatment to obtain a hot rolled coil, wherein the finish rolling temperature is 260-330 ℃;

step S5, cold rolling, finished product annealing and air cooling treatment: and sequentially carrying out cold rolling, finished product annealing and air cooling treatment on the hot rolled coil to obtain the aluminum alloy plate for the new energy automobile battery box.

Preferably, the temperature of the melting furnace when the melting in the step S2 is performed is 1050 ℃ to 1150 ℃.

Preferably, the aluminum alloy melt is filtered by an online filtering system of plate filtration and deep bed filtration when refining in the step S2.

Preferably, when the degassing and deslagging are performed in step S2, the degassing and deslagging are performed on-line by using a degassing tank and a filtering tank.

Preferably, in the step S5, the annealing temperature of the finished product is 350 ℃ to 450 ℃.

Preferably, in the step S5, the tapping temperature of the finished product after annealing is 350 ℃ to 450 ℃.

Preferably, in the step S5, the cooling rate is 10 ℃/sec or more in the air-cooling treatment.

The invention also provides an aluminum alloy for the battery box body of the new energy automobile, which comprises the following components in percentage by mass: 0.2 to 0.6 percent of silicon, 0.05 to 0.10 percent of iron, 0.05 to 0.12 percent of copper, 0.005 to 0.04 percent of titanium, 0.10 to 0.30 percent of manganese, 3.2 to 4.2 percent of magnesium, less than or equal to 0.02 percent of zinc, and the balance of aluminum and inevitable impurities.

Preferably, the aluminum alloy for the battery box body of the new energy automobile is prepared by the production method of the aluminum alloy for the battery box body of the new energy automobile.

Compared with the prior art, the invention adds certain silicon into the aluminum-magnesium alloy to form the aging strengthening phase Mg₂Adding a certain content of copper into the Si phase for solid solution strengthening; and sequentially carrying out cold rolling, finished product annealing and air cooling treatment on the hot-rolled aluminum alloy slab ingot to obtain the aluminum alloy plate for the new energy automobile battery box, namely carrying out recrystallization annealing on the finished product, and then carrying out quick cooling by adopting air cooling treatment to obtain the alloy in a state similar to T4. The aluminum alloy for the new energy automobile battery box, which is prepared by the production method of the aluminum alloy for the new energy automobile battery box, has relatively low strength before forming and is easy to punch and form; after forming, the strength is improved through natural aging, and the use requirement is met.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

FIG. 1 is a schematic flow chart of a production method of the aluminum alloy for the new energy automobile battery box.

[ detailed description ] embodiments

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to the attached drawing 1, the invention provides a production method of an aluminum alloy for a new energy automobile battery box body, which comprises the following steps:

step S1, batching: the aluminum alloy material is prepared from the following components in percentage by mass: 0.2 to 0.6 percent of silicon, 0.05 to 0.10 percent of iron, 0.05 to 0.12 percent of copper, 0.005 to 0.04 percent of titanium, 0.10 to 0.30 percent of manganese, 3.2 to 4.2 percent of magnesium, less than or equal to 0.02 percent of zinc, and the balance of aluminum and inevitable impurities.

Step S2, smelting, deslagging and casting: and (3) putting the aluminum alloy raw material into a smelting furnace with furnace gas temperature of 1050-1150 ℃ for smelting to prepare an aluminum alloy melt, and naturally, selecting a proper smelting furnace for smelting according to actual conditions.

When the temperature of the aluminum alloy melt reaches 720-750 ℃, refining; in this embodiment, will refine the back aluminum alloy fuse-element utilizes the degassing tank to carry out the degasification, adopts plate-type filtration + deep bed to filter and removes the sediment.

In this embodiment, preferably, when the temperature of the aluminum alloy melt reaches 720-:

adding a sodium-free refining agent according to the dosage of 0.5 kg/t.Al refining agent, refining for 30min, standing for 10min, and removing slag, wherein the temperature of the aluminum alloy melt in the process is not more than 760 ℃.

And after the furnace is turned over, the temperature of the aluminum alloy melt is determined to be 740 and 750 ℃, refining is carried out again, and a refining agent is added according to the dosage of 0.75 kg/t.Al refining agent, and refining is carried out for 30-40 min.

Refining for 15min by using argon, removing slag to ensure that no obvious suspended slag exists on the surface of the melt, standing for 15-30min, and entering the next step for casting. The refining process can be reasonably selected according to the weight of the actual aluminum alloy melt, and the refined aluminum alloy melt can enter the next step only if the components are qualified.

And casting the aluminum alloy melt subjected to degassing and deslagging in a semi-continuous casting machine to obtain an aluminum alloy slab ingot.

Step S3, homogenizing annealing: raising the temperature to make the temperature of the aluminum alloy slab ingot reach 450-550 ℃, and preserving the heat for 5-20 h.

In this embodiment, during the homogenization annealing, the furnace gas temperature is set to 560 ℃, so that the aluminum alloy slab ingot is kept at 480 ℃ for 8 hours.

Step S4, hot rolling: and carrying out hot rolling on the aluminum alloy slab ingot subjected to the homogenizing annealing treatment to obtain a hot rolled coil, wherein the finishing temperature is 260-330 ℃.

In this example, a hot rolled coil having a thickness of 6mm was rolled by a 1+3 hot rolling mill, wherein the finishing temperature was 302 ℃.

Step S5, cold rolling, finished product annealing and air cooling treatment: and sequentially carrying out cold rolling, finished product annealing and air cooling treatment on the hot rolled coil to obtain the aluminum alloy plate for the new energy automobile battery box.

In this embodiment, when performing cold rolling, the hot-rolled coil is subjected to multiple-pass cold rolling, and is annealed after being rolled to a finished product thickness of 1.5 mm.

When the finished product annealing is carried out, the annealing temperature of the finished product is 350-450 ℃, and the tapping temperature of the finished product after annealing is 350-450 ℃. Preferably, the annealing temperature of the finished product is 400 ℃.

And after the finished product is annealed, immediately transferring the finished product to a coiling device provided with a powerful cooling fan, opening the cooling fan, and carrying out air cooling treatment while coiling, wherein the cooling speed is more than or equal to 10 ℃/s, and finally obtaining the aluminum alloy plate for the battery box of the new energy automobile. The tensile strength of the produced aluminum alloy plate for the new energy automobile battery box is more than or equal to 280MPa, the tensile strength of the aluminum alloy plate after being stamped into the box is more than or equal to 300MPa after being placed for more than or equal to 10 days, and the mechanical property is better.

The aluminum alloy for the new energy automobile battery box produced by the steps comprises the following components in percentage by mass: 0.2 to 0.6 percent of silicon, 0.05 to 0.10 percent of iron, 0.05 to 0.12 percent of copper, 0.005 to 0.04 percent of titanium, 0.10 to 0.30 percent of manganese, 3.2 to 4.2 percent of magnesium, less than or equal to 0.02 percent of zinc, and the balance of aluminum and inevitable impurities.

Compared with the prior art, the invention adds certain silicon into the aluminum-magnesium alloy to form the aging strengthening phase Mg₂Adding a certain content of copper into the Si phase for solid solution strengthening; and sequentially carrying out cold rolling, finished product annealing and air cooling treatment on the hot-rolled aluminum alloy slab ingot to obtain the aluminum alloy plate for the new energy automobile battery box, namely carrying out recrystallization annealing on the finished product, and then carrying out quick cooling by adopting air cooling treatment to obtain the alloy in a state similar to T4.The aluminum alloy for the new energy automobile battery box, which is prepared by the production method of the aluminum alloy for the new energy automobile battery box, has relatively low strength before forming and is easy to punch and form; after forming, the strength is improved through natural aging, and the use requirement is met.

While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.