Magnesium alloy plate and preparation method for inhibiting rolling edge cracks of magnesium alloy plate

Abstract

The invention provides a preparation method for inhibiting rolling edge cracks of a magnesium alloy plate, and belongs to the technical field of magnesium alloy machining. The preparation method comprises the following steps: providing an auxiliary lining plate; the auxiliary lining plates are fixed to the two sides of the magnesium alloy plate raw material, and a combined plate is formed; carrying out preheating and heat preservation treatment on the combined plate; carrying out hot rolling treatment on the combined plate subjected to heat preservation; and the auxiliary lining plate is removed. The preparation method has the advantages that the phenomenon of edge cracking during rolling of the magnesium alloy plate is reduced, and the rolling cost of the magnesium alloy plate can be reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of magnesium alloy processing, and in particular to a magnesium alloy plate and a preparation method for inhibiting rolling edge cracking of the magnesium alloy plate. Background Art

[0002] Magnesium and magnesium alloys are the lightest metal structural materials currently used in engineering applications. They are characterized by light weight, high specific strength, excellent damping and vibration reduction performance, good electromagnetic shielding performance, and easy recycling. They are widely used in many fields such as electronic products, automobile industry, and aerospace. However, due to the close-packed hexagonal crystal structure of magnesium alloys, there are fewer independent slip systems that can be activated when deformed at low temperatures, and the room temperature deformation capacity is poor, which makes it very easy for magnesium alloy sheets to produce serious edge crack defects during ordinary traditional rolling. The main cause of edge cracks is that the magnesium alloy sheet is subjected to excessive tensile stress due to the lateral extension of the edge during the rolling process and the difference in flow velocity between the middle and edge. The generation of edge cracks reduces the production quality of magnesium alloy sheets and greatly limits the large-scale application of magnesium alloy sheets. Therefore, the edge crack problem has become a hot issue in the current magnesium alloy processing process. It is of great practical significance to study the process method to reduce or inhibit the edge cracking of magnesium alloy rolling.

[0003] After searching, it was found that the patent document with patent number CN114132022A disclosed a wedge-shaped liner for hard and brittle high modulus magnesium alloy and its edge crack control rolling method and application. The principle is to use a wedge-shaped liner containing a groove plate and a cover plate to assist in rolling the magnesium alloy sheet. Although this method can effectively reduce the rolling edge crack of the magnesium alloy sheet, it is only for hard and brittle high modulus magnesium alloy sheets and has certain limitations; and the wedge-shaped liner with grooves needs to be processed separately, and the magnesium alloy sheet may be difficult to remove after rolling and deforming in the groove of the wedge-shaped liner, which is not suitable for industrial application. Patent document CN110947766A discloses a tapered roller and rolling method for reducing edge cracks of magnesium alloy plates. The principle is to select a suitable tapered sleeve, use a tapered roller composed of a baffle, a tapered sleeve and a roller body to roll the slab in one pass, prefabricate the edge convexity of the corresponding height and width, and then use a common roller to roll the slab to a thin plate; or first use a tapered roller to roll in one pass to prefabricate the edge convexity of the slab, and the middle pass is an alternating rolling of a common flat roller and a tapered roller, and the last pass is a rolling with a common flat roller to roll the slab to a thin plate. This method requires the use of special rollers for rolling, has a high manufacturing cost, and a complicated process flow, and is not suitable for industrial applications.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] The purpose of the present disclosure is to overcome the shortcomings of the above-mentioned prior art and provide a magnesium alloy sheet and a preparation method for inhibiting edge cracking of the magnesium alloy sheet during rolling. In order to reduce the phenomenon of edge cracking of the magnesium alloy sheet during magnesium alloy processing, the preparation method uses a conventional rolling method to achieve the reduction of edge cracking of the magnesium alloy sheet. Furthermore, in the preparation method, the surface of the magnesium alloy sheet does not need to be pretreated, the entire process is easy to implement and simple to operate, and has good industrial application prospects.

[0006] According to a first aspect of the present disclosure, a preparation method for suppressing rolling edge cracking of a magnesium alloy sheet is provided, comprising:

[0007] Provide auxiliary lining;

[0008] The auxiliary lining plates are detachably fixed to both sides of the magnesium alloy sheet material to form a combined sheet;

[0009] Preheating and heat-insulating the combined plate;

[0010] hot rolling the combined plate after heat preservation;

[0011] The auxiliary liner is removed.

[0012] According to an embodiment of the present disclosure, the material of the auxiliary lining plate is at least one of pure magnesium, magnesium alloy or aluminum alloy.

[0013] According to an embodiment of the present disclosure, when the combined board is subjected to preheating and heat preservation treatment, the preheating and heat preservation temperature of the combined board is between 300 and 450°C.

[0014] According to an embodiment of the present disclosure, when the combined board is subjected to preheating and heat preservation treatment, the preheating and heat preservation time of the combined board is between 10 and 30 minutes.

[0015] According to an embodiment of the present disclosure, the thickness of the magnesium alloy sheet material is between 3 and 10 mm, the width of the magnesium alloy sheet material is between 50 and 200 mm, and the width of the auxiliary lining plate is smaller than the width of the magnesium alloy sheet material.

[0016] According to one embodiment of the present disclosure, the width of the auxiliary lining plate is between 10 and 30 mm.

[0017] According to one embodiment of the present disclosure, when the auxiliary lining plates are detachably fixed to both sides of the magnesium alloy sheet material to form a combined sheet material, the thickness of the auxiliary lining plates on both sides is the same as the thickness of the magnesium alloy sheet material, and the length of the magnesium alloy sheet material is the same as the length of the auxiliary lining plates.

[0018] According to one embodiment of the present disclosure, when the preheated and heat-insulated combined plate is hot rolled, the deformation of the combined plate in a single hot rolling process is between 15% and 65%, and the rolling speed of the combined plate is between 10 and 20 m / min.

[0019] According to an embodiment of the present disclosure, when the auxiliary lining plates are detachably fixed to both sides of the magnesium alloy sheet material to form a combined sheet material, the auxiliary lining plates are bundled to both sides of the magnesium alloy sheet material by metal wires.

[0020] According to another aspect of the present disclosure, there is provided a magnesium alloy sheet material, which is prepared by the preparation method for suppressing rolling edge cracking of a magnesium alloy sheet material as described in the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0022] Figure 1 The present invention is a schematic diagram of the preparation steps of a method for suppressing edge cracking of a magnesium alloy sheet during rolling in one embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of the macroscopic morphology of the magnesium alloy plate after rolling in Example 1.

[0024] Figure 3 This is a schematic diagram of the macroscopic morphology of the magnesium alloy plate after rolling in Example 2.

[0025] Figure 4 This is a schematic diagram of the macroscopic morphology of the magnesium alloy sheet after rolling in Comparative Example 1.

[0026] Figure 5 This is a schematic diagram of the macroscopic morphology of the magnesium alloy sheet after rolling in Comparative Example 2. DETAILED DESCRIPTION

[0027] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present disclosure will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale.

[0028] In the related art, there are several methods for rolling magnesium alloy sheets. First, the magnesium alloy sheets are rolled with the aid of a wedge-shaped liner containing a groove plate and a cover plate. This method can reduce the rolling edge cracks of the magnesium alloy sheets to a certain extent, but it is only applicable to hard, brittle and high modulus magnesium alloy sheets and has certain limitations. At the same time, the wedge-shaped liner containing the groove needs to be processed separately, and the magnesium alloy sheet may be difficult to remove after being deformed by rolling in the groove of the wedge-shaped liner, which is not suitable for industrial application. Second, select a suitable cone sleeve and use a tapered roller composed of a baffle, a cone sleeve and a roller body to roll the slab in one pass to pre-fabricate the edge convexity of the corresponding height and width, and then use ordinary rollers to roll the slab into a thin plate; or first use a tapered roller to roll in one pass to pre-fabricate the edge convexity of the slab, and use ordinary flat rollers and tapered rollers alternately in the middle pass, and use ordinary flat rollers in the last pass to roll the slab into a thin plate. This method requires the use of special rollers for rolling, has a high production cost, and a complicated and cumbersome process flow, and is not suitable for industrial applications.

[0029] Based on this, the present disclosure provides a method for suppressing edge cracking of magnesium alloy sheets during rolling. Figure 1 , the preparation method includes steps S1 to S5.

[0030] Step S1: providing an auxiliary lining plate.

[0031] Step S2: The auxiliary lining plates are detachably fixed to both sides of the magnesium alloy sheet material to form a combined sheet.

[0032] Step S3: preheating and heat-insulating the combined board.

[0033] Step S4: hot rolling the preheated composite plate.

[0034] Step S5: removing the auxiliary lining plate.

[0035] The preparation method for inhibiting the rolling edge crack of the magnesium alloy sheet provided by the present disclosure is to add auxiliary lining plates on both sides of the magnesium alloy sheet raw material, and the auxiliary lining plates are transversely combined with the magnesium alloy sheet raw material to form a combined sheet. The combined sheet is hot rolled using a traditional symmetrical rolling process. During the rolling process, the auxiliary lining plates arranged on both sides of the magnesium alloy sheet raw material can effectively inhibit the lateral widening of the edge of the magnesium alloy sheet raw material, reduce the edge tensile stress of the rolled magnesium alloy sheet raw material to a certain extent, and play the effect of inhibiting the edge crack of the magnesium alloy sheet raw material, thereby obtaining a magnesium alloy rolled sheet with significantly reduced edge cracks, and significantly improving the yield rate of the magnesium alloy sheet. At the same time, the preparation method for inhibiting the rolling edge crack of the magnesium alloy sheet provided by the present disclosure does not require special treatment of the magnesium alloy sheet raw material (for example, it does not require complex surface treatment processes such as grinding, cleaning and lubrication of the magnesium alloy sheet), which helps to improve the processing efficiency of the magnesium alloy sheet. Furthermore, the auxiliary lining plates are easy to obtain, and the entire process of rolling the magnesium alloy sheet is simple and easy to operate, which helps to reduce the processing cost of the magnesium alloy sheet.

[0036] In some embodiments of the present disclosure, the material of the magnesium alloy sheet is magnesium, zinc, zirconium and cerium.

[0037] The preparation method for suppressing rolling edge cracking of magnesium alloy sheets provided by the present invention will be described in detail below.

[0038] In some embodiments of the present disclosure, when providing an auxiliary lining plate, the material of the auxiliary lining plate may be at least one of pure magnesium, magnesium alloy or aluminum alloy plate. For example, the material of the auxiliary lining plate is pure magnesium, magnesium alloy or aluminum alloy.

[0039] In some embodiments of the present disclosure, when the auxiliary lining plates are detachably fixed to both sides of the magnesium alloy sheet material to form a combined sheet, the auxiliary lining plates are tied to both sides of the magnesium alloy sheet material by metal wires. For example, the metal wires may be iron wires, copper wires, or aluminum wires. It should be noted that in other embodiments, the material of the metal wires is not limited thereto.

[0040] At the same time, it should be noted that in the embodiment of the present disclosure, the two sides of the magnesium alloy sheet material refer to the two sides in the width direction of the magnesium alloy sheet material. At the same time, in the embodiment of the present disclosure, the metal wires are arranged at both ends of the combined sheet, and in the embodiment of the present disclosure, the specific position of the metal wires is not specifically limited.

[0041] As an example, the metal wire is an iron wire, and there is no specific restriction on the diameter of the iron wire, as long as it can achieve the function of detachably fixing the auxiliary lining plate to both sides of the magnesium alloy plate material.

[0042] In some embodiments of the present disclosure, when the auxiliary lining plates are detachably fixed to both sides of the magnesium alloy plate material to form a combined plate, the temperature of preheating and heat preservation of the combined plate is between 300 and 450° C. For example, the temperature of preheating and heat preservation of the combined plate is 300° C., 350° C., 400° C. or 450° C. It should be noted that in other embodiments of the present disclosure, the temperature of preheating and heat preservation of the combined plate is not limited to this.

[0043] In some embodiments of the present disclosure, when the auxiliary lining plates are detachably fixed to both sides of the magnesium alloy sheet material to form a combined sheet, the preheating and heat preservation time of the combined sheet is between 10 and 30 minutes. For example, the preheating and heat preservation time of the combined sheet is 10 minutes, 15 minutes, 25 minutes or 30 minutes. It should be noted that in other embodiments of the present disclosure, the preheating and heat preservation time of the combined sheet is not limited to this.

[0044] In some embodiments of the present disclosure, the thickness of the magnesium alloy sheet material is between 3 mm and 10 mm. For example, the thickness of the magnesium alloy sheet material is 3 mm, 6 mm, 9 mm or 10 mm. It should be noted that in other embodiments, the thickness of the magnesium alloy sheet material is not limited thereto.

[0045] In some embodiments of the present disclosure, the width of the magnesium alloy sheet material is between 50 and 200 mm. For example, the width of the magnesium alloy sheet material is 50 mm, 100 mm, 150 mm or 200 mm. It should be noted that in other embodiments, the width of the magnesium alloy sheet material is not limited thereto.

[0046] In some embodiments of the present disclosure, the width of the auxiliary lining plate is smaller than the width of the magnesium alloy sheet material.

[0047] As an example, the thickness of the magnesium alloy sheet material is between 3 and 10 mm, the width of the magnesium alloy sheet material is between 50 and 200 mm, and the width of the auxiliary lining plate is smaller than the width of the magnesium alloy sheet material.

[0048] In some embodiments of the present disclosure, the width of the auxiliary lining plate is between 10 and 30 mm. For example, the width of the auxiliary lining plate is 10 mm, 15 mm, 20 mm or 30 mm. It should be noted that in other embodiments, the width of the auxiliary lining plate is not limited thereto.

[0049] In some embodiments of the present disclosure, when the auxiliary lining plates are detachably fixed to both sides of the magnesium alloy sheet material to form a combined sheet material, the thickness of the auxiliary lining plates arranged on both sides of the magnesium alloy sheet material is the same as the thickness of the magnesium alloy sheet material. In this way, when the magnesium alloy sheet material is rolled, the surfaces of the magnesium alloy sheet material and the auxiliary lining plates can contact the rolling rollers together.

[0050] In some embodiments of the present disclosure, when the auxiliary lining plates are detachably fixed to both sides of the magnesium alloy sheet material to form a combined sheet material, the length of the magnesium alloy sheet material is the same as the length of the auxiliary lining plates, so that the lateral extension of the edge of the magnesium alloy sheet material can be effectively prevented.

[0051] As an example, when the auxiliary lining plates are detachably fixed to both sides of the magnesium alloy sheet material to form a combined sheet material, the thickness of the auxiliary lining plates arranged on both sides of the magnesium alloy sheet material is the same as the thickness of the magnesium alloy sheet material; the length of the magnesium alloy sheet material is the same as the length of the auxiliary lining plates.

[0052] In some embodiments of the present disclosure, when the preheated composite sheet is hot rolled, the deformation of the composite sheet in a single hot rolling process is between 15% and 65%. For example, the deformation of the composite sheet in a single hot rolling process is 15%, 35%, 55% or 65%. It should be noted that in other embodiments, the deformation of the composite sheet in a single hot rolling process is not limited thereto.

[0053] In some embodiments of the present disclosure, when the preheated composite sheet is hot rolled, the rolling speed of the hot rolling of the composite sheet is between 10 and 20 m / min. For example, the rolling speed of the hot rolling is 10 m / min, 14 m / min, 18 m / min or 20 m / min. It should be noted that in other embodiments, the rolling speed of the hot rolling is not limited thereto.

[0054] As an example, when the preheated and heat-insulated combined plate is hot rolled, the deformation of the combined plate in a single hot rolling process is between 15% and 65%; and the rolling speed of the combined plate in the hot rolling process is between 10 and 20 m / min.

[0055] The disclosed embodiment also provides a magnesium alloy sheet, which is prepared by the above-mentioned preparation method for suppressing rolling edge cracking of the magnesium alloy sheet.

[0056] The preparation method for suppressing rolling edge cracking of magnesium alloy sheet provided by the embodiment of the present disclosure is further described below in combination with different embodiments and corresponding drawings.

[0057] Embodiment 1:

[0058] Example 1 A magnesium alloy plate without edge cracks was prepared by transverse composite rolling with a set pass reduction of 61.6%.

[0059] The specific preparation steps are:

[0060] Step 1: Provide an auxiliary lining plate. In this embodiment, the material of the auxiliary lining plate is a magnesium alloy; the size of the auxiliary lining plate in the length direction (length) is 100 mm, the size in the width direction (width) is 15 mm, and the size in the thickness direction (height) is 5 mm.

[0061] Step 2: The auxiliary lining plates are detachably fixed to both sides of the magnesium alloy plate material to form a combined plate. Specifically, the auxiliary lining plates are tied together with fine iron wires to obtain a transversely stacked combined plate.

[0062] In this step, the magnesium alloy sheet material has a length of 100 mm, a width of 40 mm, and a thickness of 5 mm.

[0063] Step 3: Preheat and insulate the combined plate. Specifically, put the combined plate into a heat treatment path for preheat and insulate treatment, the preheat and insulate temperature is 350° C., and the preheat and insulate time is 30 minutes.

[0064] Step 4: hot rolling the preheated composite plate. Specifically, after the preheating and heat preservation of the composite plate, a double-roll mill is used to perform single-pass deformation synchronous rolling on the composite plate. In this step, the mill roll gap is set to 1.92 mm, the rolling reduction rate is 61.6%, and the rolling speed is 10 m / min.

[0065] Step 5: Removing the auxiliary lining plate. Specifically, after the composite plate is rolled, the auxiliary lining plate is removed to obtain a magnesium alloy plate without obvious edge cracks.

[0066] Figure 2 This is a schematic diagram of a magnesium alloy sheet after rolling. It can be seen that the magnesium alloy sheet has no obvious edge cracks.

[0067] Embodiment 2:

[0068] Example 2 A magnesium alloy sheet without edge cracks was prepared by transverse composite rolling with a set pass reduction of 63.6%.

[0069] The specific preparation steps are:

[0070] Step 1: Provide an auxiliary lining plate. In this embodiment, the auxiliary lining plate is made of magnesium alloy; the auxiliary lining plate has a length of 100 mm, a width of 15 mm, and a thickness of 5 mm.

[0071] Step 2: The auxiliary lining plates are detachably fixed to both sides of the magnesium alloy plate material to form a combined plate. Specifically, the auxiliary lining plates are tied together with fine iron wires to obtain a transversely stacked combined plate.

[0072] In this step, the magnesium alloy sheet material has a length of 100 mm, a width of 40 mm, and a thickness of 5 mm.

[0073] Step 3: Preheat and insulate the combined board. Specifically, put the combined board into a heat treatment furnace for preheat and insulate treatment, the preheat and insulate temperature is 350° C., and the preheat and insulate time is 30 minutes.

[0074] Step 4: hot rolling the preheated composite sheet. Specifically, after the preheating and heat preservation of the composite sheet is completed, a double-roll mill is used to perform single-pass deformation synchronous rolling on the composite sheet. In this step, the mill roll gap is set to 1.82 mm, the rolling reduction rate is 63.6%, and the rolling speed is 13 m / min.

[0075] Step 5: Removing the auxiliary lining plate. Specifically, after the composite plate is rolled, the auxiliary lining plate is removed to obtain a magnesium alloy plate without obvious edge cracks.

[0076] Figure 3 The schematic diagram of the magnesium alloy sheet after the second rolling is shown in Figure 1. It can be seen that the magnesium alloy sheet has no obvious edge cracks. To further verify the effect of the preparation method for inhibiting the edge cracks of the magnesium alloy sheet during rolling, the embodiment of the present disclosure provides comparative examples (such as comparative example 1 and comparative example 2) to further verify the preparation method.

[0077] Comparative Example 1:

[0078] It should be noted that the difference between Comparative Example 1 and Example 1 is that in Comparative Example 1, auxiliary lining plates are not bundled on both sides of the magnesium alloy plate raw material before rolling, and Comparative Example 1 and Example 1 use the same rolling process (for example, the rolling mill roll gap is set to 1.92 mm, the rolling reduction rate is 61.6%, and the rolling speed is 10 m / min).

[0079] Figure 4 Schematic diagram of the magnesium alloy sheet after rolling in Comparative Example 1. It can be seen that the magnesium alloy sheet after rolling contains a large number of edge cracks. Therefore, it can be verified that the preparation method can significantly reduce the phenomenon of edge cracks in the magnesium alloy sheet.

[0080] Comparative Example 2:

[0081] It should be noted that the difference between Comparative Example 2 and Example 2 is that in Comparative Example 2, auxiliary lining plates are not bundled on both sides of the magnesium alloy plate raw material before rolling, and Comparative Example 2 and Example 2 use the same rolling process (for example, the rolling mill roll gap is set to 1.82 mm, the rolling reduction rate is 63.6%, and the rolling speed is 13 m / min).

[0082] Figure 5 Schematic diagram of the magnesium alloy sheet after rolling in comparative example 2. It can be seen that the magnesium alloy sheet after rolling contains a large number of edge cracks. Therefore, it can be further verified that the preparation method can significantly reduce the phenomenon of edge cracks in the magnesium alloy sheet.

[0083] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A method for inhibiting edge cracking of magnesium alloy sheets during rolling, characterized in that: include: Provide auxiliary lining; The auxiliary lining plates are detachably fixed to both sides of the magnesium alloy sheet material to form a combined sheet; Preheating and heat-insulating the combined plate; Hot rolling the preheated composite plate; The auxiliary liner is removed.

2. The method for suppressing rolling edge cracking of magnesium alloy sheet according to claim 1, characterized in that: The auxiliary lining plate is made of at least one of pure magnesium, magnesium alloy or aluminum alloy.

3. The method for suppressing rolling edge cracking of magnesium alloy sheet according to claim 1, characterized in that: When the combined board is subjected to preheating and heat preservation treatment, the preheating and heat preservation temperature of the combined board is between 300 and 450°C.

4. The method for suppressing rolling edge cracking of magnesium alloy sheet according to claim 1 or 3, characterized in that: When the combined board is subjected to preheating and heat preservation treatment, the preheating and heat preservation time of the combined board is between 10 and 30 minutes.

5. The method for suppressing rolling edge cracking of magnesium alloy sheet according to claim 1, characterized in that: The thickness of the magnesium alloy sheet material is between 3 and 10 mm, the width of the magnesium alloy sheet material is between 50 and 200 mm, and the width of the auxiliary lining plate is smaller than the width of the magnesium alloy sheet material.

6. The method for suppressing rolling edge cracking of magnesium alloy sheet according to claim 1 or 5, characterized in that: The width of the auxiliary lining plate is between 10 and 30 mm.

7. The method for suppressing rolling edge cracking of magnesium alloy sheet according to claim 1, characterized in that: When the auxiliary lining plates are detachably fixed to both sides of the magnesium alloy sheet material to form a combined sheet material, the thickness of the auxiliary lining plates on both sides is the same as the thickness of the magnesium alloy sheet material, and the length of the magnesium alloy sheet material is the same as the length of the auxiliary lining plates.

8. The method for suppressing rolling edge cracking of magnesium alloy sheet according to claim 1, characterized in that: When the preheated and heat-insulated combined plate is hot-rolled, the deformation of the combined plate in a single hot-rolling process is between 15% and 65%, and the rolling speed of the combined plate is between 10 and 20 m / min.

9. The method for suppressing rolling edge cracking of magnesium alloy sheet according to claim 1, characterized in that: When the auxiliary lining plates are detachably fixed to the two sides of the magnesium alloy sheet material to form a combined sheet material, the auxiliary lining plates are bundled to the two sides of the magnesium alloy sheet material by metal wires.

10. A magnesium alloy sheet, characterized in that: The magnesium alloy sheet is prepared by the preparation method for inhibiting rolling edge cracking of the magnesium alloy sheet according to any one of claims 1 to 9.

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