阅读说明：本技术 一种改善铝合金性能的连续正交轧制方法 (continuous orthogonal rolling method for improving performance of aluminum alloy ) 是由 张晓波 万雄斌 张潇 冯佰刚 张全鑫 任军强 于 2019-11-25 设计创作，主要内容包括：本发明公开了一种改善铝合金性能的连续正交轧制方法,通过将铸造好的铝合金粗胚进行多道次热轧,每一次热轧都是在粗胚初次通过轧辊后,将该粗胚的两个沿轧制方向的正交平面进行正交旋转90°,之后,使其再次通过轧辊,如此反复多次轧制,每一次正交轧制过程都是粗胚初次通过轧辊-正交旋转-粗胚再次通过轧辊。当正交轧制的样品达到一定厚度时,停止正交旋转,调节辊缝进行轧制,最终使铸态合金粗胚总的压下量为60～80%,从而得到正交轧制态产品。本发明正交轧制方法工艺要求简单,制备效率高,成本低,使铸态铝合金的组织均匀,提高了合金强度、延伸率和力学性能。(The invention discloses continuous orthogonal rolling methods for improving aluminum alloy performance, which are characterized in that cast aluminum alloy rough blanks are subjected to multi-pass hot rolling, after the rough blanks pass through a roller for the first time in every hot rolling, two orthogonal planes of the rough blanks along the rolling direction are subjected to orthogonal rotation for 90 degrees, then the rough blanks pass through the roller again, the rolling is repeated for multiple times, and each orthogonal rolling processes are that the rough blanks pass through the roller for the first time, the orthogonal rotation is performed, the rough blanks pass through the roller again, when the thickness of an orthogonal rolling sample reaches fixed thickness, the orthogonal rotation is stopped, a roller gap is adjusted for rolling, and finally the total reduction of the cast alloy rough blanks is 60-80%, so that orthogonal rolling products are obtained.)

1, A continuous orthogonal rolling method for improving the performance of aluminum alloy, which is characterized in that the rolling method comprises the following steps:

1) preheating a mould required by casting;

2) according to the formula (m)₁×50%)/(m₁+m₂) Calculating the mass ratio of pure aluminum ingot to intermediate alloy by =5%, wherein m₁Mass of the master alloy, m₂The mass of the pure aluminum ingot; respectively taking a pure aluminum ingot and an intermediate alloy with the quality meeting the formula, melting the pure aluminum ingot, adding the intermediate alloy, melting the intermediate alloy, standing, fully stirring, removing slag, casting into a preheated mold, and solidifying to obtain an as-cast alloy rough blank;

or, according to the formula (m)₁×50%)/(m₁+m₂) Calculating the mass ratio of pure aluminum ingot to intermediate alloy by =5%, wherein m₁Mass of the master alloy, m₂The mass of the pure aluminum ingot; respectively taking a pure aluminum ingot and an intermediate alloy with the quality meeting the formula, melting the pure aluminum ingot, adding the intermediate alloy, standing after the intermediate alloy is melted, fully stirring, removing slag to obtain an alloy melt, adding a refiner when the temperature of the alloy melt is reduced to 750 ℃, fully stirring, casting into a preheated mold, and solidifying to obtain an as-cast alloy rough blank;

3) heating the as-cast alloy rough blank to 400-450 ℃, preserving heat for 30-40 min, carrying out hot rolling to form a primary hot-rolled blank, carrying out 90-degree orthogonal rotation on two orthogonal planes of the primary hot-rolled blank along the rolling direction, carrying out secondary rolling, and preserving heat for 6-10 min at the temperature of 400-450 ℃;

4) reducing the roll gap of the roll by 1-2 mm, repeating the step 3), then repeating the step 3) for multiple times, wherein in the repeated process, the roll gap of the roll needs to be reduced before rolling for every times, so that the rolling reduction of each time is 5-10% until a blank with the thickness of 6-8 mm is obtained;

5) and stopping orthogonal rotation, adjusting the roll gap of the roll, rolling the blank to ensure that the total rolling reduction of the as-cast alloy rough blank is 60-80%, and preparing an orthogonal rolling product.

2. The continuous orthogonal rolling method for improving the performance of the aluminum alloy as claimed in claim 1, wherein in the step 1), the die is preheated for 30-40 min in an environment with the temperature of 240-250 ℃, so as to obtain the preheated die.

3. The continuous orthogonal rolling method for improving the performance of aluminum alloy according to claim 1, wherein in the step 2), the intermediate alloy is left for 1-2 min after being melted.

4. The continuous orthogonal rolling method for improving properties of aluminum alloy according to claim 1, wherein in the step 2), the mass of the refiner is 0.5% of the sum of the mass of the pure aluminum ingot and the mass of the master alloy.

5. The continuous orthogonal rolling method for improving properties of aluminum alloy according to claim 1 or 4, wherein Al5Ti1B is used as the refiner.

6. The continuous orthogonal rolling method for improving the performance of aluminum alloy according to claim 1, wherein in the step 3) and the step 4), the rolling stock is kept from deflecting during the secondary rolling after orthogonal rotation.

Technical Field

The invention belongs to the technical field of metal material preparation, and relates to continuous orthogonal rolling methods for improving the performance of aluminum alloy.

Background

Aluminum and its alloys have a very important status in modern industry, and its application is quite a, as kinds of materials commonly used in industrial production, it has many advantages such as light weight, corrosion resistance, good electric and thermal conductivity, excellent plastic forming performance, low cost, etc. therefore, there is a need in the fields of aerospace, construction, automobile manufacturing, etc. a.

, the properties of the as-cast metal can be effectively improved by the post-processing of the as-cast metal, while the strength can be improved by the conventional process of rolling along the rolling direction, but the elongation and plastic deformation capabilities are reduced.

Disclosure of Invention

The invention aims to provide continuous orthogonal rolling methods for improving the performance of aluminum alloy, and improve the strength and the elongation of cast aluminum alloy.

In order to achieve the aim, the invention adopts the technical scheme that continuous orthogonal rolling methods for improving the performance of aluminum alloy are shown in a flow chart of figure 1, and the rolling method is specifically carried out according to the following steps:

1) preheating the die for 30-40 min in an environment with the temperature of 240-250 ℃ to obtain a preheated die;

2) according to the formula (m)₁×50%)/(m₁+m₂) =5% calculated mass ratio of pure aluminum ingot to master alloy (AlCu 50), where m₁Mass of the master alloy, m₂The mass of the pure aluminum ingot; respectively taking a pure aluminum ingot and an intermediate alloy with the quality meeting the formula, heating the pure aluminum ingot to be molten, adding the intermediate alloy into molten aluminum, standing for 1-2 min after the intermediate alloy is molten, fully stirring, and removing slag to obtain an alloy molten liquid; casting the alloy melt into a preheated mold, and cutting off a dead head after solidification to obtain an as-cast alloy rough blank;

or, according to the formula (m)₁×50%)/(m₁+m₂) =5% calculated mass ratio of pure aluminum ingot to master alloy (AlCu 50), where m₁Mass of the master alloy, m₂The mass of the pure aluminum ingot; respectively taking a pure aluminum ingot and an intermediate alloy with the mass meeting the formula, heating the pure aluminum ingot to be molten, adding the intermediate alloy into molten aluminum, standing for 1-2 min after the intermediate alloy is molten, fully stirring, and removing slag to obtain an alloy melt; when the temperature of the alloy melt is reduced to 750 ℃, adding a refiner, wherein the mass of the refiner is 0.5 percent of the sum of the mass of the pure aluminum ingot and the mass of the intermediate alloy, fully stirring, deslagging, casting into a preheated mold, solidifying, and cutting off a dead head to obtain an as-cast alloy rough blank;

the refiner was Al5Ti 1B. After the refiner is added, the grains are refined, and the casting structure is more uniform.

3) Putting the as-cast alloy rough blank into a heat treatment furnace, heating to 400-450 ℃, preserving heat for 30-40 min, and then carrying out hot rolling, wherein the as-cast alloy rough blank forms a primary hot rolled blank after passing through a roller, two orthogonal planes of the primary hot rolled blank along the rolling direction are subjected to 90-degree orthogonal rotation, then the primary hot rolled blank is rolled again through the roller, and then the primary hot rolled blank is put into the heat treatment furnace, preserved heat for 6-10 min at the temperature of 400-450 ℃, and waits for times of orthogonal rolling;

the primary hot rolled stock is kept from deflection during the secondary rolling after the orthogonal rotation.

4) Reducing the roll gap of the roll by 1-2 mm, repeating the step 3), then repeating the step 3) for multiple times, wherein in the repeated process, the roll gap of the roll needs to be reduced before rolling for every times, so that the rolling reduction of each time is 5-10% until a blank with the thickness of 6-8 mm is obtained;

in each rolling process in the step 4), the hot rolling billet is kept from deflecting.

5) And adjusting the roll gap of the roll, rolling the blank to finally enable the total rolling reduction of the as-cast alloy rough blank to be 60-80%, and preparing the required orthogonal rolling product.

Compared with a cast sample and a product which is not subjected to orthogonal rolling, the cast structure after orthogonal rolling is more uniform, casting defects are eliminated, and the performance is greatly improved.

Drawings

FIG. 1 is a schematic flow diagram of the rolling method of the present invention.

FIG. 2 is a graph of engineering stress-strain curves for the cross-rolled product from example 1, the as-cast alloy billet from example 1, and the rolled product from comparative example 1.

FIG. 3 is a graph of engineering stress-strain curves for the cross-rolled product from example 2, the as-cast alloy billet from example 1, and the rolled product from comparative example 2.

FIG. 4 is a structural diagram of an as-cast alloy blank.

FIG. 5 is a structural diagram of a rolled product obtained in comparative example 1, an orthogonally rolled product obtained in example 1, and an orthogonally rolled product obtained in example 2.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.