A method for producing a magnesium alloy foil

Abstract

The application discloses a magnesium alloy foil preparation method, which comprises the following steps: rolling a magnesium alloy sheet with a thickness of 1mm into a magnesium alloy foil with a thickness of 0.08mm through three passes; the roller temperature of the first pass is 120 DEG C, the rolling tension is 1.5kN, the rolling speed is 0.15m / s, the rolling temperature is 180-220 DEG C, and the rolling reduction is 55%-65%; the roller temperature of the second pass is 120 DEG C, the rolling tension is 1.5kN, the rolling speed is 0.15m / s, the rolling temperature is 40 DEG C-60 DEG C, and the rolling reduction is 40%-60%; and the roller temperature of the third pass is 120 DEG C, the rolling tension is 1.5kN, the rolling speed is 0.15m / s, the rolling temperature is room temperature, and the rolling reduction is 50%-60%. The magnesium foil preparation method solves the problem of complicated preparation process, can be used for industrial production, and has low capital investment cost.

Description

Technical Field

[0001] This invention relates to the field of magnesium alloy material forming and manufacturing technology, and in particular to a method for preparing magnesium alloy foil. Background Technology

[0002] Magnesium alloy foil possesses excellent specific damping coefficient, internal dissipation coefficient, specific stiffness, and specific strength, exhibiting high-fidelity sound quality when used as diaphragm and acoustic diaphragm materials, making it a promising candidate for applications in audio equipment. Furthermore, magnesium alloy foil also exhibits excellent magnetic permeability, electrical conductivity, outstanding vibration damping performance, and electromagnetic shielding properties, making it suitable for use as shielding foil in high-end electronic products and aerospace applications. Moreover, magnesium is an essential trace element for the human body, thus magnesium alloy foil as a packaging material would be more beneficial to human health and environmentally friendly. In addition, magnesium and magnesium alloy foil possess advantages such as high theoretical specific capacity (2.22 Ahg⁻¹), low cost, non-toxicity, and high power, making them ideal negative electrode materials for batteries. Therefore, magnesium or magnesium alloy foil has a broad market prospect in the future.

[0003] In materials handbooks, non-ferrous metal materials with a thickness of 0.3 mm or less and varying lengths and widths are referred to as foils. Rolling is the most common method for producing foils. However, due to the close-packed crystal structure and large c / a axis ratio of magnesium alloys, their conventional plastic processing performance is poor. Therefore, using conventional ultra-thin plate rolling methods results in drawbacks such as difficulty in maintaining rolling temperature due to the small thickness and rapid temperature drop during rolling, leading to numerous rolling passes and repeated reheating of the billet between passes. This results in extremely low production efficiency for magnesium alloy foils and extremely high prices for magnesium foils.

[0004] Therefore, the conventional rolling method for ultra-thin plates to roll magnesium alloys usually requires more than 3, at least 4-6 rolling passes. For example, CN200910307937.2 disclosed a method for rolling magnesium or magnesium alloy foil; CN201210100705.1 disclosed a method for rolling magnesium alloy sheet / foil and its rolling system; and CN201710188862.5 disclosed a method for preparing magnesium alloy foil, etc.

[0005] Therefore, how to design a magnesium alloy foil rolling method that can complete the rolling process with fewer rolling passes, thereby reducing the difficulty of the process and the production cost, has become a problem that needs to be further solved by those in the field. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is: how to provide a method for preparing magnesium alloy foil that only requires three rolling processes, is simpler in process, and has lower cost.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] A method for preparing magnesium alloy foil, using a metal foil rolling mill, is characterized by rolling a 1mm thick magnesium alloy sheet into a 0.08mm thick magnesium alloy foil through three passes; the rolling process includes the following steps:

[0009] (1) Set the rolling parameters and preheat and temperature control the rolls and magnesium alloy sheet so that they can complete three passes of rolling under the required temperature conditions;

[0010] (2) The first pass of rolling is carried out. The roll temperature of the first pass is 120 ℃, the rolling tension is 1.5 kN, the rolling speed is 0.15 m / s, the rolling temperature (referring to the temperature of the plate) is 180~220 ℃, and the rolling reduction is 55%~65%; the thin plate after rolling is trimmed.

[0011] (3) The second pass of rolling is carried out. The roll temperature of the second pass is 120 ℃, the rolling tension is 1.5 kN, the rolling speed is 0.15 m / s, the rolling temperature is 40 ℃~60 ℃, and the rolling reduction is 40%~60%. The thin plate after rolling is trimmed.

[0012] (4) Perform the third pass of rolling. The roll temperature of the third pass is 120 ℃, the rolling tension is 1.5 kN, the rolling speed is 0.15 m / s, the rolling temperature is room temperature, and the rolling reduction is 50%~60%. After rolling, the required magnesium alloy foil is obtained.

[0013] In this rolling method, both the roll temperature and the sheet temperature are simultaneously regulated and controlled. The roll temperature is maintained at 120℃ for all three rolling passes, while the sheet temperature gradually decreases from approximately 200℃ to approximately 50℃ and then to room temperature. This slows down grain growth and prevents 0.4mm or 0.2mm thin sheets from oxidizing and sticking to the rolls at higher temperatures. Furthermore, under a tension of 1.5 kN, the sheet is prone to softening and melting defects at higher temperatures. Therefore, this material maintains good surface quality under controlled temperature conditions and effectively meets the requirement of forming the sheet in just three rolling passes.

[0014] Furthermore, in step (1), the roll is hollowed out and connected to a heat transfer circulation pipe, and the roll is preheated by driving the hot oil medium to circulate through the inner cavity of the roll. This is more convenient, faster, and easier to control.

[0015] Further, in step (1), hydraulic metal chucks are used to clamp the two ends of the rolled plate passing through the roll gap. At the same time, the hydraulic metal chucks apply an outward stretching tension to the two ends of the rolled plate. Then, the hydraulic metal chucks at both ends are connected to the current circuit. The heat effect generated by the current is used to raise the plate temperature to the required temperature. After the temperature is raised, the current circuit is disconnected. Rolling is carried out on the basis of maintaining the outward stretching tension of the hydraulic metal chucks on the two ends of the rolled plate.

[0016] This method of heating the material by applying electricity is more convenient and faster, and the heating effect is more reliable. At the same time, during the rolling process, outward tension is applied to both ends of the rolled plate, which, together with the rolls, allows the plate to be rolled thinner more quickly and efficiently, thus better ensuring the rolling effect.

[0017] Furthermore, the tension is 1.5 kN, which better ensures the effect.

[0018] Furthermore, the magnesium alloy sheet has the following material composition by mass percentage: Gd 0.45%, Mn 0.027%, Fe 0.0083%, Na 0.0006%, Ca 0.0003%, B 0.0002%, with the remainder being Mg and non-removable impurity elements.

[0019] Magnesium alloy materials using the above-mentioned proportions exhibit reduced recrystallization grain growth due to solute segregation. Furthermore, recrystallization is also suppressed at a rolling temperature of 200 °C. In addition, the addition of Gd alters the bonding state between Mg atoms, promoting the initiation of non-basal slip, significantly weakening the texture of the magnesium alloy sheet, thereby improving the formability and plasticity of the magnesium alloy material. Therefore, this magnesium alloy material exhibits good ductility under controlled temperature conditions, well meeting the requirement of being rollable in just three passes.

[0020] Furthermore, during the trimming process, the total trimming width on both sides is 4mm.

[0021] Therefore, this invention employs an online heating rolling technology with three rolling passes to prepare magnesium alloy foil with a minimum thickness of 0.08 mm and no wrinkles on the surface. In the first rolling pass, a 1 mm magnesium alloy sheet is rolled to 0.4 mm thickness at a rolling temperature of 200 ℃. The edge cracks generated in the first pass are cut off, and then the sheet enters the second rolling pass. At a rolling temperature of 50 ℃, the 0.4 mm magnesium alloy sheet is rolled to 0.2 mm. Similarly, the edge cracks generated in the second pass are cut off, and then the sheet enters the third rolling pass. At room temperature, the 0.2 mm magnesium alloy sheet is rolled to 0.08 mm. The rolling process can simultaneously ensure the flatness of the sheet. The method of this invention solves the problem of cumbersome preparation process of magnesium foil and can be used for industrial production with low infrastructure investment costs. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to specific embodiments.

[0023] Preferred embodiment: A method for preparing magnesium alloy foil, using a metal foil rolling mill, characterized in that a 1mm thick magnesium alloy sheet is rolled into a 0.08mm thick magnesium alloy foil in three passes; the rolling process includes the following steps:

[0024] (1) Set the rolling parameters and preheat and temperature control the rolls and magnesium alloy sheet so that they can complete three passes of rolling under the required temperature conditions;

[0025] (2) The first pass of rolling is carried out. The roll temperature of the first pass is 120 ℃, the rolling tension is 1.5 kN, the rolling speed is 0.15 m / s, the rolling temperature (referring to the temperature of the plate) is 200 ℃, and the rolling reduction is 60%. After rolling, the thin plate is trimmed. The first pass of rolling yields a 0.4 mm magnesium alloy thin plate.

[0026] (3) The second rolling pass is carried out. The roll temperature of the second pass is 120 ℃, the rolling tension is 1.5 kN, the rolling speed is 0.15 m / s, the rolling temperature is 50 ℃, and the rolling reduction is 50%. The thin plate after rolling is trimmed.

[0027] (4) The third rolling pass is carried out. The rolling temperature of the third pass is 120 ℃, the rolling tension is 1.5 kN, the rolling speed is 0.15 m / s, the rolling temperature is room temperature, and the rolling reduction is 60%. After rolling, a magnesium alloy foil with a required thickness of 0.08 mm is obtained.

[0028] In this rolling method, both the roll temperature and the sheet temperature are simultaneously regulated and controlled. The roll temperature is maintained at 120℃ for all three rolling passes, while the sheet temperature gradually decreases from approximately 200℃ to approximately 50℃ and then to room temperature. This slows down grain growth and prevents 0.4mm or 0.2mm thin sheets from oxidizing and sticking to the rolls at higher temperatures. Furthermore, under a tension of 1.5 kN, the sheet is prone to softening and melting defects at higher temperatures. Therefore, this material maintains good surface quality under controlled temperature conditions and effectively meets the requirement of forming the sheet in just three rolling passes.

[0029] In practice, in step (1), the roll is hollow and connected to a heat transfer circulation pipe, and the roll is preheated by driving the hot oil medium to circulate through the inner cavity of the roll.

[0030] In implementation, in step (1), hydraulic metal chucks are used to clamp the two ends of the rolled plate passing through the roll gap. At the same time, the hydraulic metal chucks apply an outward stretching tension to the two ends of the rolled plate. Then, the hydraulic metal chucks at both ends are connected to the current circuit. The heat effect generated by the current is used to raise the plate temperature to the required temperature. After the temperature is raised, the current circuit is disconnected. Rolling is carried out on the basis of maintaining the outward stretching tension of the hydraulic metal chucks on the two ends of the rolled plate. The tension is 1.5 kN.

[0031] This method of heating the material by applying electricity is more convenient and faster, and the heating effect is more reliable. At the same time, during the rolling process, outward tension is applied to both ends of the rolled plate, which, together with the rolls, allows the plate to be rolled thinner more quickly and efficiently, thus better ensuring the rolling effect.

[0032] In practice, the magnesium alloy sheet has the following material composition by mass percentage: Gd 0.45%, Mn 0.027%, Fe 0.0083%, Na 0.0006%, Ca 0.0003%, B 0.0002%, with the remainder being Mg and other non-removable impurity elements.

[0033] Magnesium alloy materials using the above-mentioned proportions exhibit reduced recrystallization grain growth due to solute segregation. Furthermore, recrystallization is also suppressed at a rolling temperature of 200 °C. In addition, the addition of Gd alters the bonding state between Mg atoms, promoting the initiation of non-basal slip, significantly weakening the texture of the magnesium alloy sheet, thereby improving the formability and plasticity of the magnesium alloy material. Therefore, this magnesium alloy material exhibits good ductility under controlled temperature conditions, well meeting the requirement of being rollable in just three passes.

[0034] During implementation, the total shearing width on both sides is 4mm after the first two rolling processes.

Claims

1. A method for preparing magnesium alloy foil, comprising rolling using metal foil rolling equipment, characterized in that, A 1mm thick magnesium alloy sheet is rolled into a 0.08mm thick magnesium alloy foil through three passes; the rolling process includes the following steps: (1) Set the rolling parameters and preheat and temperature control the rolls and magnesium alloy sheet so that they can complete three passes of rolling under the required temperature conditions; (2) The first pass of rolling is carried out. The roll temperature of the first pass is 120 ℃, the rolling tension is 1.5 kN, the rolling speed is 0.15 m / s, the rolling temperature is 180~220 ℃, and the rolling reduction is 55%~65%. After rolling, the thin plate is trimmed. (3) The second pass of rolling is carried out. The roll temperature of the second pass is 120 ℃, the rolling tension is 1.5 kN, the rolling speed is 0.15 m / s, the rolling temperature is 40 ℃~60 ℃, and the rolling reduction is 40%~60%. The thin plate after rolling is trimmed. (4) Perform the third pass of rolling. The roll temperature of the third pass is 120 ℃, the rolling tension is 1.5 kN, the rolling speed is 0.15 m / s, the rolling temperature is room temperature, and the rolling reduction is 50%~60%. After rolling, the required magnesium alloy foil is obtained.

2. The method for preparing magnesium alloy foil as described in claim 1, characterized in that, (1) In the step, the roll is hollow and connected to a heat transfer circulation pipe, and the roll is preheated by driving the hot oil medium to circulate through the inner cavity of the roll.

3. The method for preparing magnesium alloy foil as described in claim 1, characterized in that, (1) In the step, hydraulic metal chucks are used to clamp the two ends of the rolled plate passing through the roll gap. At the same time, the hydraulic metal chucks apply an outward stretching tension to the two ends of the rolled plate. Then, the hydraulic metal chucks at both ends are connected to the current circuit. The heat effect generated by the current is used to raise the plate temperature to the required temperature. After the temperature is raised, the current circuit is disconnected. Rolling is carried out on the basis of maintaining the outward stretching tension of the hydraulic metal chucks on the two ends of the rolled plate.

4. The method for preparing magnesium alloy foil as described in claim 1, characterized in that, The magnesium alloy sheet has the following material composition by mass percentage: Gd 0.45%, Mn 0.027%, Fe 0.0083%, Na 0.0006%, Ca 0.0003%, B 0.0002%, with the remainder being Mg and non-removable impurity elements.

5. The method for preparing magnesium alloy foil as described in claim 1, characterized in that, When trimming the edges, the total trimming width on both sides is 4mm.