A continuous coiling rolling system and rolling process for magnesium and magnesium alloy sheet / foil coils

Abstract

This invention provides a continuous winding and rolling system for magnesium and magnesium alloy sheet / foil rolls, comprising a first temperature-controlled winding roll, a first temperature-controlled tension roll, a temperature-controlled work roll, a second temperature-controlled tension roll, a second temperature-controlled winding roll, and support rolls located on both sides of the temperature-controlled work roll, arranged sequentially. The first temperature-controlled winding roll, the first temperature-controlled tension roll, the temperature-controlled work roll, the second temperature-controlled tension roll, and the second temperature-controlled winding roll are all dual-purpose (hot and cold) rolls, and each dual-purpose roll includes a heating system and a cooling system. Based on this continuous winding and rolling system, during the rolling process, different hot and cold combinations of the winding roll, tension roll, and work roll can be used according to the material properties of the magnesium alloy material, and the temperatures of the winding roll, tension roll, and work roll can be controlled to perform multi-pass continuous winding and rolling of the magnesium alloy material until the target thickness is achieved. This invention enables continuous rolling of magnesium and magnesium alloy sheet / foil rolls, ensuring product quality stability and improving production efficiency.

Description

Technical Field

[0001] This invention relates to the field of magnesium and magnesium alloy rolling technology, specifically to a continuous winding and rolling system and rolling process for magnesium and magnesium alloy sheet / foil rolls. Background Technology

[0002] Magnesium alloys, as the lightest metallic structural materials currently used in practical applications, have a low specific gravity and significant weight-saving effects. In recent years, they have been gradually applied in aerospace, defense, automotive, and 3C electronics industries, with different fields having different requirements for magnesium alloys. Currently, wrought magnesium alloy products produced through processes such as extrusion, forging, and rolling are gradually replacing traditional cast magnesium alloys due to their higher strength, better ductility, and superior mechanical properties. Among these, rolling, as an efficient and low-cost plastic forming method in magnesium alloy industrial production, can refine grains, improve microstructure, and significantly enhance the mechanical properties of the alloy. In recent years, to meet customer needs, coil rolling has gradually replaced single-sheet rolling and has been incorporated into research, achieving significant advantages in coil technology. Advantages of coil rolling:

[0003] (1) Tension rolling is beneficial to the stability of the rolling process and the control of the plate shape;

[0004] (2) It reduces the contact area between the strip and the air, so the temperature drops slowly and oxidation can be avoided;

[0005] (3) It is conducive to the welding of the head and tail and makes it easy to achieve continuous rolling;

[0006] (4) It is beneficial to the heat treatment process.

[0007] However, the current technology for rolling magnesium alloy sheets is not yet mature. The rolled sheets have high anisotropy, poor stamping formability, severe edge cracking, and low material utilization. These factors greatly limit the application of magnesium alloy sheets, especially the rolling of magnesium alloy thin sheets and foil rolls (less than 0.1 mm) of 1 mm and below.

[0008] To address the bottlenecks in magnesium alloy sheet / foil roll fabrication, such as difficulties in preparation, low production efficiency, and product quality, current rolling methods for magnesium alloy sheet / foil rolls can be divided into two categories. The first category involves heating the billet or rolls. This rolling method utilizes the good plasticity of magnesium alloys at certain temperatures. Examples include a combination of heated billet and cold roll rolling, or modifications to the rolling equipment to achieve hot roll rolling via internal or external heating of the rolls. However, because the thickness of the sheet / foil is less than 1 mm, the temperature of the sheet is difficult to control precisely during rolling due to air convection and heat conduction through contact with the rolls. Uneven temperature distribution leads to uneven deformation and a tendency to create waves. Furthermore, localized softening of the billet during rolling, under tension, makes it prone to tearing and surface oxidation, severely impacting production efficiency, yield, and quality stability. Another method is cold rolling + cold billet + intermediate annealing. However, this rolling method, which involves rolling to a certain deformation and then re-annealing, has extremely low production efficiency. Furthermore, during re-annealing, the thin sheet / strip is prone to surface oxidation upon contact with hot air, and the temperature is uneven. Therefore, there is a need to provide a continuous rolling process for magnesium and magnesium alloy thin sheets / foil rolls to solve the problems of difficult preparation, poor surface quality and dimensional accuracy, and low production efficiency in existing magnesium and magnesium alloy thin sheet / foil roll production. Summary of the Invention

[0009] To address the aforementioned technical problems, this invention provides a continuous winding and rolling system and rolling process for magnesium and magnesium alloy sheet / foil rolls. This system solves the problems of difficult preparation of magnesium and magnesium alloy sheet / foil rolls, poor surface quality and dimensional accuracy, and low production efficiency. It enables continuous rolling of magnesium and magnesium alloy sheet / foil rolls, ensuring product quality stability and improving production efficiency.

[0010] The present invention adopts the following technical solution:

[0011] The present invention provides a continuous winding and rolling system for magnesium and magnesium alloy sheet / foil rolls, comprising a first temperature-controlled winding roll, a first temperature-controlled tension roll, a temperature-controlled working roll, a second temperature-controlled tension roll, a second temperature-controlled winding roll, and support rolls located on both sides of the temperature-controlled working roll arranged in sequence.

[0012] Temperature sensors are provided on one or both sides of the first temperature-controlled take-up roller, the first temperature-controlled tension roller, the temperature-controlled work roller, the second temperature-controlled tension roller, and the second temperature-controlled take-up roller.

[0013] The first temperature-controlled take-up roller, the first temperature-controlled tension roller, the temperature-controlled work roller, the second temperature-controlled tension roller, and the second temperature-controlled take-up roller are all dual-purpose rollers for both hot and cold applications, and the dual-purpose rollers for both hot and cold applications include a heating system and a cooling system.

[0014] The heating system, cooling system, and temperature sensor of the first temperature-controlled take-up roller, the first temperature-controlled tension roller, the temperature-controlled work roller, the second temperature-controlled tension roller, and the second temperature-controlled take-up roller are all connected to the temperature control system.

[0015] In the above technical solution, the first temperature-controlled take-up roll, the first temperature-controlled tension roll, the temperature-controlled work roll, the second temperature-controlled tension roll, and the second temperature-controlled take-up roll are all dual-purpose rolls for both heating and cooling. The dual-purpose rolls for both heating and cooling include a heating system and a cooling system, which can be achieved by axially arranging heating rods and cooling water holes inside the roll.

[0016] Furthermore, the first temperature-controlled take-up roller and the second temperature-controlled take-up roller are provided with heat insulation covers.

[0017] In the above technical solutions, when the first temperature-controlled take-up roller and the second temperature-controlled take-up roller are hot winding rollers, it is usually necessary to set up a heat insulation cover to prevent heat loss, or a heating cover can be set up to ensure temperature stability.

[0018] Furthermore, the temperature-controlled work roll is a reversible rolling mill work roll.

[0019] In addition, based on the above-mentioned continuous coiling and rolling system, the present invention also provides a continuous coiling and rolling process for magnesium and magnesium alloy sheet / foil coils, comprising the following steps:

[0020] (1) Determine the type and characteristics of magnesium and magnesium alloys, and determine the hot and cold combination of the first / second temperature-controlled take-up roller, the first / second temperature-controlled tension roller and the temperature-controlled work roller based on the room temperature plasticity of magnesium alloy materials.

[0021] (2) The magnesium or magnesium alloy coil is rolled onto the first temperature-controlled take-up roller, the coil is unwound, and the direction of the unwound strip is adjusted by the first temperature-controlled tension roller so that it enters the temperature-controlled work roller horizontally for one rolling pass. After one rolling pass, the direction of the strip is adjusted by the second temperature-controlled tension roller so that it is rolled onto the second temperature-controlled take-up roller.

[0022] (3) Adjust the reversible mill to work in reverse so that the coil on the second temperature-controlled take-up roll passes through the second temperature-controlled tension roll and the temperature-controlled work roll in sequence for two passes of rolling. After the two passes of rolling, the direction of the strip is adjusted by the first temperature-controlled tension roll so that it is rolled onto the first temperature-controlled take-up roll.

[0023] Repeat steps (1)-(3) above to perform multiple continuous winding and rolling until the target thickness of magnesium or magnesium alloy sheet / foil roll is obtained, specifically 0.01-1.0mm magnesium or magnesium alloy sheet / foil roll.

[0024] Further, the hot and cold combination of the first / second temperature-controlled take-up roller, the first / second temperature-controlled tension roller, and the temperature-controlled work roller in step (1) includes: hot take-up roller + cold tension roller + cold work roller, hot take-up roller + hot tension roller + cold work roller, cold take-up roller + hot tension roller + cold work roller, cold take-up roller + cold tension roller + cold work roller, hot take-up roller + hot tension roller + hot work roller, cold take-up roller + hot tension roller + hot work roller, hot take-up roller + cold tension roller + hot work roller; preferably, the following combinations are used: hot take-up roller + cold tension roller + cold work roller, hot take-up roller + hot tension roller + cold work roller, cold take-up roller + hot tension roller + cold work roller, hot take-up roller + hot tension roller + hot work roller.

[0025] Further, in step (1), when the magnesium alloy material has good plasticity, the hot and cold combination of the first / second temperature-controlled coiling roll, the first / second temperature-controlled tension roll, and the temperature-controlled work roll is selected as either hot coiling roll + cold tension roll + cold work roll or cold coiling roll + hot tension roll + cold work roll. For the hot and cold combination of hot coiling roll + cold tension roll + cold work roll, the temperature of the first / second temperature-controlled coiling roll is controlled at 100-150℃, the temperature of the first / second temperature-controlled tension roll is controlled at 20-25℃, and the temperature of the temperature-controlled work roll is controlled at 20-25℃ during the rolling process. For the cold and hot combination of cold coiling roll + hot tension roll + cold work roll, the temperature of the first / second temperature-controlled coiling roll is controlled at 20-25℃, the temperature of the first / second temperature-controlled tension roll is controlled at 100-150℃, and the temperature of the temperature-controlled work roll is controlled at 20-25℃ during the rolling process.

[0026] When the magnesium alloy material has moderate plasticity, the hot and cold combination of the first / second temperature-controlled take-up roll, the first / second temperature-controlled tension roll, and the temperature-controlled work roll is selected as hot take-up roll + hot tension roll + cold work roll; for the hot take-up roll + hot tension roll + cold work roll hot and cold combination, the temperature of the first / second temperature-controlled take-up roll is controlled at 150-200℃, the temperature of the first / second temperature-controlled tension roll is controlled at 150-200℃, and the temperature of the temperature-controlled work roll is controlled at 20-25℃ during the rolling process;

[0027] When magnesium alloy materials have poor plasticity, the hot and cold combination method of the first / second temperature-controlled coiling roll, the first / second temperature-controlled tension roll, and the temperature-controlled work roll is selected as hot coiling roll + hot tension roll + hot work roll; for the hot coiling roll + hot tension roll + hot work roll hot and cold combination method, the temperature of the first / second temperature-controlled coiling roll, the temperature of the first / second temperature-controlled tension roll, and the temperature of the temperature-controlled work roll are controlled at 200-250℃ during the rolling process.

[0028] In the above technical solution, for magnesium alloy materials with good plasticity (room temperature elongation of more than 20%), when hot coiling roll + cold tension roll + cold work roll or cold coiling roll + hot tension roll + cold work roll is used, the hot coiling roll or hot tension roll can enable the magnesium alloy material to achieve online stress relief and static recrystallization annealing softening and grain refinement. Then, cold rolling is performed to cause plastic deformation and reduce the thickness of the material. After rolling, online stress relief annealing and static recrystallization are performed again on the hot coiling roll or hot tension roll to refine the grain and avoid grain growth. Repeated rolling can ensure good surface quality and dimensional accuracy of magnesium alloy, and obtain magnesium alloy sheet / foil roll with fine grain structure and excellent mechanical properties.

[0029] For magnesium alloys with moderate plasticity (10%-20% elongation at room temperature), when rolling is performed using a combination of hot and cold rolling with hot coiling rolls, hot tension rolls, and cold work rolls, the magnesium alloy enters the hot tension rolls through the hot coiling rolls, where it is heated to a certain temperature through heat conduction. Then it enters the cold work rolls for cold rolling, which deforms and thins the magnesium alloy material. The material is then heated again by the hot coiling rolls and hot tension rolls, which causes static recrystallization of the grains to refine the grains and improve the mechanical properties of the magnesium alloy material.

[0030] For magnesium alloys with poor plasticity (room temperature elongation below 10%), when rolling is carried out using a combination of hot coiling rolls, hot tension rolls, and hot work rolls, the hot coiling rolls enable the magnesium alloy to achieve online stress relief and static recrystallization annealing softening and grain refinement. After being heated by the hot tension rolls and hot work rolls, the plastic deformation capacity of the plate during the rolling process is further improved. Finally, hot rolling is performed to make the plate reach the expected thickness and mechanical property requirements.

[0031] Further, in step (1), for magnesium alloys with good plasticity, when hot coiling roll + hot tension roll + cold work roll or hot coiling roll + cold tension roll + cold work roll is selected, the temperature of the first / second coiling roll is set to T = T0 + 10℃, where T0 is the recrystallization temperature of the magnesium alloy material under Δh cold rolling deformation and time t = L / 2v, t is the time for the effective length of the magnesium alloy strip to pass through the work roll, L is the effective length of the magnesium alloy strip passing through the work roll, and v is the linear speed of the magnesium alloy strip rolling process.

[0032] Furthermore, during the rolling process in step (2), the first / second temperature-controlled take-up roll, the first / second temperature-controlled tension roll, and the temperature-controlled work roll heat or cool the magnesium alloy material through surface contact heat conduction.

[0033] Furthermore, the thickness of the magnesium and magnesium alloy material before rolling is 0.1 to 5 mm, and the thickness of the magnesium and magnesium alloy material after rolling is 0.01 to 1.0 mm.

[0034] The beneficial effects of this invention are:

[0035] (1) This invention provides a continuous winding and rolling system for magnesium and magnesium alloy sheet / foil rolls, including temperature-controlled winding rolls, temperature-controlled tension rolls and temperature-controlled working rolls. The temperature-controlled winding rolls, temperature-controlled tension rolls and temperature-controlled working rolls are all dual-purpose rolls for both heating and cooling. Their heating and cooling are adjustable and their temperatures are controllable. Different combinations of heating and cooling can be selected for rolling according to the type and characteristics of magnesium alloy materials. In addition, this invention achieves direct heating or cooling of magnesium alloy materials through each roll. That is, heat or cold is transferred to the magnesium alloy sheet material in contact with the roll through contact heat conduction, so that it is heated to or cooled to a specific temperature, ensuring smooth rolling. This can improve the surface quality, dimensional accuracy and mechanical properties of sheet and foil materials. There is no need to set up heating methods such as resistance furnaces and hot air, avoiding the oxidation of magnesium alloy surface caused by hot air from resistance furnaces and other heating methods coming into contact with the sheet and strip.

[0036] (2) The present invention also provides a rolling process based on a continuous rolling system, which can select different cold and hot combinations for rolling according to the characteristics of different types of magnesium alloys, and realize continuous coiling rolling with high production efficiency; at the same time, the cold and hot combination of coiling roll, tension roll and work roll can also realize the free combination of cold deformation, hot deformation, static recrystallization and dynamic recrystallization, thereby obtaining magnesium alloy sheet / foil roll with high surface quality and excellent mechanical properties; and the thickness of the obtained magnesium alloy sheet / foil roll can reach 0.01-1.0mm. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the continuous winding and rolling system of the present invention;

[0038] Figure 2 This is a schematic diagram of the structure of the hot and cold dual-purpose roller of the present invention;

[0039] Figure 3 Metallographic image of the Mg-Zn-RE magnesium alloy coil obtained by rolling in Example 1;

[0040] Figure 4 Metallographic image of the AZ31 magnesium alloy coil obtained by rolling in Example 2;

[0041] The diagram is labeled as follows: 1. First temperature-controlled take-up roller; 2. First temperature-controlled tension roller; 3. Temperature-controlled work roller; 4. Second temperature-controlled tension roller; 5. Second temperature-controlled take-up roller; 6. Support roller; 7. Temperature sensor; 8. Temperature control system; 9. Insulation cover; 10. Heating channel; 11. Cooling water channel. Detailed Implementation

[0042] The present invention will now be described in detail with reference to the accompanying drawings:

[0043] See Figure 1 and Figure 2 This invention provides a continuous winding and rolling system for magnesium and magnesium alloy sheet / foil rolls, comprising a first temperature-controlled winding roll 1, a first temperature-controlled tension roll 2, a temperature-controlled working roll 3, a second temperature-controlled tension roll 4, a second temperature-controlled winding roll 5 arranged in sequence, and support rolls 6 located on both sides of the temperature-controlled working roll 3. The first and second temperature-controlled tension rolls are each composed of three tension rolls to control the direction and force on the magnesium alloy sheet / strip. In addition, the first temperature-controlled winding roll 1, the first temperature-controlled tension roll 2, the temperature-controlled working roll 3, the second temperature-controlled tension roll 4, and the second temperature-controlled winding roll 5 are all reversible rolls, capable of rotating in both forward and reverse directions.

[0044] Temperature sensors 7 are provided on one or both sides of the first temperature-controlled take-up roller 1, the first temperature-controlled tension roller 2, the temperature-controlled working roller 3, the second temperature-controlled tension roller 4 and the second temperature-controlled take-up roller 5. Specifically, temperature sensors can be provided on the front side of the first temperature-controlled take-up roller 1 and the first temperature-controlled tension roller 2, the rear side of the second temperature-controlled tension roller 4 and the second temperature-controlled take-up roller 5, and the front and rear sides of the temperature-controlled working roller 3.

[0045] In addition, the first temperature-controlled take-up roller 1, the first temperature-controlled tension roller 2, the temperature-controlled work roller 3, the second temperature-controlled tension roller 4, and the second temperature-controlled take-up roller 5 are all dual-purpose rollers for both heating and cooling. The dual-purpose rollers for both heating and cooling include a heating system and a cooling system. Specifically, a heating channel 10 can be provided at the center of each roller along its axial direction, and several axial cooling water channels 11 can be provided radially around the outer ring of the heating channel. Heating rods can be installed in the heating channel 10 for heating, and the cooling water channels 11 are connected to cooling water pipes for cooling.

[0046] The aforementioned continuous winding and rolling system also includes a temperature control system 8, and the heating systems, cooling systems, and temperature sensors 7 of the first temperature-controlled winding roll 1, the first temperature-controlled tension roll 2, the temperature-controlled work roll 3, the second temperature-controlled tension roll 4, and the second temperature-controlled winding roll 5 are all connected to the temperature control system 8. Through the aforementioned temperature control system and temperature sensors, the temperature of each roll and the sheet / foil can be monitored in real time and adjusted as needed.

[0047] In addition, when the first temperature-controlled take-up roller 1 and the second temperature-controlled take-up roller 5 are hot winding rollers, a heat insulation cover 9 or a heating cover can usually be installed on their exterior to prevent heat loss and ensure temperature stability.

[0048] Example 1

[0049] Based on the aforementioned continuous coiling and rolling system, Mg-Zn-RE magnesium alloy is continuously rolled. The initial thickness of the Mg-Zn-RE magnesium alloy coil is 3 mm, and the target thickness is 0.6 mm. The specific rolling process is as follows:

[0050] (1) The room temperature plasticity of Mg-Zn-RE magnesium alloy rolled coils reaches more than 20%. Select a hot coiling roll + cold tension roll + cold work roll or a cold coiling roll + hot tension roll + cold work roll combination method, select a suitable temperature, and set the temperature of the corresponding rolls through the temperature control system.

[0051] If a hot-cold combination of hot take-up rolls, cold tension rolls, and cold work rolls is selected, then during the rolling process, the temperature of the first / second temperature-controlled take-up rolls is controlled at 100-150℃, the temperature of the first / second temperature-controlled tension rolls is controlled at 20-25℃, and the temperature of the temperature-controlled work rolls is controlled at 20-25℃. In this embodiment, the specific temperature settings are: the temperature of the first / second temperature-controlled take-up rolls is 120℃, the temperature of the first / second temperature-controlled tension rolls is 25℃, and the temperature of the temperature-controlled work rolls is 25℃.

[0052] If a combination of cold take-up rolls, hot tension rolls, and cold work rolls is selected, the temperature of the first / second temperature-controlled take-up rolls is controlled at 20-25℃, the temperature of the first / second temperature-controlled tension rolls is controlled at 100-150℃, and the temperature of the temperature-controlled work rolls is controlled at 20-25℃ during the rolling process. In this embodiment, the temperature of the first / second temperature-controlled take-up rolls is specifically set at 20℃, the temperature of the first / second temperature-controlled tension rolls is set at 150℃, and the temperature of the temperature-controlled work rolls is set at 20℃.

[0053] (2) The Mg-Zn-RE magnesium alloy coil is wound on the first temperature-controlled take-up roll. The roll is heated or cooled according to the selected hot and cold combination method and temperature. When the set temperature is reached, the rolling system is started. The magnesium alloy material is unwound and conveyed from the first temperature-controlled take-up roll. When passing through the first temperature-controlled tension roll, the temperature of the magnesium alloy coil is measured and adjusted simultaneously. At the same time, the position of the first temperature-controlled tension roll is adjusted to control the direction and stress state of the magnesium alloy coil, so that the magnesium alloy material enters the temperature-controlled work roll horizontally for one rolling pass. After one rolling pass, the direction of the strip is adjusted by the second temperature-controlled tension roll, so that it is wound onto the second temperature-controlled take-up roll.

[0054] (3) Adjust the reversible mill to work in reverse so that the coil on the second temperature-controlled take-up roll passes through the second temperature-controlled tension roll and the temperature-controlled work roll in sequence for two passes of rolling. After the two passes of rolling, the direction of the strip is adjusted by the first temperature-controlled tension roll so that it is rolled onto the first temperature-controlled take-up roll.

[0055] Repeat steps (1)-(3) above for a total of 26 continuous winding and rolling passes, with a deformation amount of 1-10% per pass, until a 0.6mm magnesium alloy sheet coil is obtained.

[0056] Example 2

[0057] Based on the aforementioned continuous coiling and rolling system, AZ31 magnesium alloy was continuously rolled. The initial thickness of the AZ31 magnesium alloy coil was 1 mm, and the target thickness was 0.15 mm. The specific rolling process is as follows:

[0058] (1) Based on the material properties of AZ31 magnesium alloy rolled coil (room temperature elongation 10-20%), select the hot and cold combination method of hot take-up roll + hot tension roll + cold work roll and a suitable temperature, and set the temperature of the corresponding roll through the temperature control system.

[0059] The temperatures of the first / second temperature-controlled take-up rollers are 150-200℃, the temperatures of the first / second temperature-controlled tension rollers are 150-200℃, and the temperatures of the temperature-controlled work rollers are 20-25℃. In this embodiment, the temperatures of the first / second temperature-controlled take-up rollers are specifically set to 160℃, the temperatures of the first / second temperature-controlled tension rollers are 180℃, and the temperatures of the temperature-controlled work rollers are 25℃.

[0060] (2) The AZ31 magnesium alloy coil is wound onto the first temperature-controlled take-up roll. The roll is heated or cooled according to the selected hot and cold combination method and temperature. When the set temperature is reached, the rolling system is started. The magnesium alloy material is unwound and conveyed from the first temperature-controlled take-up roll. When passing through the first temperature-controlled tension roll, the temperature of the magnesium alloy coil is measured and adjusted simultaneously. At the same time, the position of the first temperature-controlled tension roll is adjusted to control the direction and stress state of the magnesium alloy coil, so that the magnesium alloy material enters the temperature-controlled work roll horizontally for one rolling pass. After one rolling pass, the direction of the strip is adjusted by the second temperature-controlled tension roll, so that it is wound onto the second temperature-controlled take-up roll.

[0061] (3) Adjust the reversible mill to work in reverse so that the coil on the second temperature-controlled take-up roll passes through the second temperature-controlled tension roll and the temperature-controlled work roll in sequence for two passes of rolling. After the two passes of rolling, the direction of the strip is adjusted by the first temperature-controlled tension roll so that it is rolled onto the first temperature-controlled take-up roll.

[0062] Repeat steps (1)-(3) above for 32 consecutive winding and rolling passes, with a deformation of 1-6% per pass, until a 0.15mm magnesium alloy sheet coil is obtained.

[0063] Example 3

[0064] Based on the aforementioned continuous coiling and rolling system, pure magnesium is continuously rolled. The initial thickness of the pure magnesium coil is 0.1 mm, and the target thickness is 0.03 mm. The specific rolling process is as follows:

[0065] (1) Based on the material properties of pure magnesium, select the hot and cold combination method of hot coiling roller + hot tension roller + hot working roller and the appropriate temperature, and set the temperature of the corresponding roller through the temperature control system.

[0066] The temperatures of the first / second temperature-controlled take-up rollers are 200-250℃, the temperatures of the first / second temperature-controlled tension rollers are 200-250℃, and the temperatures of the temperature-controlled work rollers are 200-250℃. In this embodiment, the temperatures of the first / second temperature-controlled take-up rollers are specifically set to 200℃, the temperatures of the first / second temperature-controlled tension rollers are 220℃, and the temperatures of the temperature-controlled work rollers are 220℃.

[0067] (2) The pure magnesium coil is wound onto the first temperature-controlled take-up roll. The roll is heated or cooled according to the selected hot and cold combination method and temperature. When the set temperature is reached, the rolling system is started. The magnesium alloy material is unwound and conveyed from the first temperature-controlled take-up roll. When passing through the first temperature-controlled tension roll, the temperature of the magnesium alloy coil is measured and adjusted simultaneously. At the same time, the position of the first temperature-controlled tension roll is adjusted to control the direction and stress state of the magnesium alloy coil, so that the magnesium alloy material enters the temperature-controlled work roll horizontally for one rolling pass. After one rolling pass, the direction of the strip is adjusted by the second temperature-controlled tension roll, so that it is wound onto the second temperature-controlled take-up roll.

[0068] (3) Adjust the reversible rolling mill to work in reverse so that the coil on the second temperature-controlled take-up roll passes through the second temperature-controlled tension roll and the temperature-controlled work roll in sequence for two passes of rolling. After the two passes of rolling, the direction of the strip is adjusted by the first temperature-controlled tension roll so that it is rolled onto the first temperature-controlled take-up roll.

[0069] Repeat steps (1)-(3) above for 18 consecutive winding and rolling passes, with a deformation of 0.5-4% per pass, until a pure magnesium coil of 0.03 mm is obtained.

[0070] Samples of the magnesium or magnesium alloy coils rolled in Examples 1-3 above were tested, and their mechanical properties and surface quality are shown in Table 1 below.

[0071] Table 1

[0072]

[0073] The magnesium or magnesium alloy coils rolled by the method of this invention have superior mechanical properties and high surface quality, meeting the requirements.

[0074] In addition, metallographic analysis was performed on samples of the magnesium alloy coils rolled using a hot-roller + cold tension roll + cold work roll combination method in Example 1 and the magnesium alloy coils rolled in Example 2, as shown below. Figure 3 , 4 As shown. From Figure 3 , 4 As can be seen, the final magnesium alloy coil has fine and uniformly distributed grains, with no obvious coarse grains.

[0075] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A continuous winding and rolling process for magnesium and magnesium alloy sheet / foil rolls, implemented using a continuous winding and rolling system, characterized in that, The continuous coiling and rolling system includes a first temperature-controlled coiling roll, a first temperature-controlled tension roll, a temperature-controlled work roll, a second temperature-controlled tension roll, a second temperature-controlled coiling roll, and support rolls located on both sides of the temperature-controlled work roll, arranged in sequence. Temperature sensors are provided on one or both sides of the first temperature-controlled take-up roller, the first temperature-controlled tension roller, the temperature-controlled work roller, the second temperature-controlled tension roller, and the second temperature-controlled take-up roller. The first temperature-controlled take-up roller, the first temperature-controlled tension roller, the temperature-controlled work roller, the second temperature-controlled tension roller, and the second temperature-controlled take-up roller are all dual-purpose rollers for both heating and cooling. Each dual-purpose roller includes a heating system and a cooling system. Each roller has a heating channel at its center and along its axial direction. Several axial cooling water channels are arranged radially around the heating channel. Heating rods are installed in the heating channels for heating, and the cooling water channels are connected to cooling water pipes for cooling. The heating system, cooling system, and temperature sensor of the first temperature-controlled take-up roller, the first temperature-controlled tension roller, the temperature-controlled work roller, the second temperature-controlled tension roller, and the second temperature-controlled take-up roller are all connected to the temperature control system. The continuous coiling and rolling process includes the following steps: (1) Determine the types of magnesium and magnesium alloys, and determine the hot and cold combination of the first / second temperature-controlled take-up rollers, the first / second temperature-controlled tension rollers and the temperature-controlled work rollers based on the room temperature plasticity of magnesium and magnesium alloy materials. (2) The magnesium or magnesium alloy coil is rolled onto the first temperature-controlled take-up roller, the coil is unwound, and the direction of the unwound strip is adjusted by the first temperature-controlled tension roller so that it enters the temperature-controlled work roller horizontally for one rolling pass. After one rolling pass, the direction of the strip is adjusted by the second temperature-controlled tension roller so that it is rolled onto the second temperature-controlled take-up roller. (3) Adjust the reversible rolling mill to work in reverse so that the coil on the second temperature-controlled take-up roll passes through the second temperature-controlled tension roll and the temperature-controlled work roll in sequence for two passes of rolling. After the two passes of rolling, the direction of the strip is adjusted by the first temperature-controlled tension roll so that it is rolled onto the first temperature-controlled take-up roll. Repeat steps (1)-(3) above to perform multiple continuous winding and rolling until magnesium or magnesium alloy sheet / foil rolls of the target thickness are obtained. The hot and cold combination methods of the first / second temperature-controlled take-up roller, the first / second temperature-controlled tension roller and the temperature-controlled work roller in step (1) include: hot take-up roller + cold tension roller + cold work roller, hot take-up roller + hot tension roller + cold work roller, cold take-up roller + hot tension roller + cold work roller, cold take-up roller + cold tension roller + cold work roller, hot take-up roller + hot tension roller + hot work roller, hot take-up roller + cold tension roller + hot work roller, cold take-up roller + cold tension roller + hot work roller; In step (1), when the magnesium alloy material has good plasticity, that is, the room temperature elongation of the magnesium alloy material is more than 20%, the hot and cold combination of the first / second temperature-controlled winding roll, the first / second temperature-controlled tension roll and the temperature-controlled working roll is selected as hot winding roll + cold tension roll + cold working roll or cold winding roll + hot tension roll + cold working roll. When the magnesium alloy material has medium plasticity, that is, the room temperature elongation of the magnesium alloy material is 10%-20%, the hot and cold combination method of the first / second temperature-controlled take-up roll, the first / second temperature-controlled tension roll and the temperature-controlled work roll is selected as hot take-up roll + hot tension roll + cold work roll. When the magnesium alloy material has poor plasticity, that is, the room temperature elongation of the magnesium alloy material is less than 10%, the hot and cold combination method of the first / second temperature-controlled take-up roll, the first / second temperature-controlled tension roll, and the temperature-controlled work roll is selected as hot take-up roll + hot tension roll + hot work roll.

2. The continuous winding and rolling process for magnesium and magnesium alloy sheet / foil rolls according to claim 1, characterized in that, The first temperature-controlled take-up roller and the second temperature-controlled take-up roller are provided with heat insulation covers.

3. The continuous winding and rolling process for magnesium and magnesium alloy sheet / foil rolls according to claim 1, characterized in that, The temperature-controlled work roll is a reversible rolling mill work roll.

4. The continuous winding and rolling process for magnesium and magnesium alloy sheet / foil rolls according to claim 1, characterized in that, In step (2) of the rolling process, the first / second temperature-controlled take-up roll, the first / second temperature-controlled tension roll and the temperature-controlled work roll heat or cool the magnesium alloy material through surface contact heat conduction.

5. The continuous winding and rolling process for magnesium and magnesium alloy sheet / foil rolls according to claim 1, characterized in that, Before rolling, the thickness of the magnesium and magnesium alloy material is 0.1~5.0mm, and after rolling, the thickness of the magnesium and magnesium alloy material is 0.01~1.0mm.

Images