A die for uniform extrusion forming of a magnesium alloy-aluminum alloy profile

Abstract

The present invention discloses a die for uniformly extruding a magnesium alloy profile, which includes a punch assembly installed below the upper template of a press and a die assembly installed above the lower template of the press; the punch assembly is formed with a punch body protruding downward; the die assembly forms a material receiving cavity with an open top directly below the punch body. The material receiving cavity is for placing a blank and for the punch body to insert downward. The bottom of the material receiving cavity forms an extrusion surface, and the extrusion surface conducts downward to form a main cavity and a plurality of fin-shaped cavities connected around the main cavity. The main cavity and the plurality of fin-shaped cavities together form a contour corresponding to the workpiece. The extrusion surface is respectively concave downward between every two adjacent fin-shaped cavities to form a current-limiting groove. Each current-limiting groove forms a first groove surface near the main cavity to limit the flow of the blank to the main cavity and a second groove surface near the fin-shaped cavity to limit the flow of the blank to the fin-shaped cavity. The present invention enables the blank to uniformly flow to the main cavity and the fin-shaped cavities during the extrusion forming process.

Description

Technical Field

[0001] The invention relates to the technical field of extrusion forming dies, and in particular to a uniform extrusion forming die for a magnesium-aluminum alloy profile. Background Art

[0002] Forward extrusion forming technology is a commonly used magnesium alloy plastic forming technology. The magnesium alloy products obtained by extrusion deformation have a series of advantages such as high material utilization, high forming precision and high production efficiency.

[0003] However, forward extrusion forming usually has the following problems: when the blank is filled into the mold cavity, the flow restriction of the blank at various places in the cavity is uneven, resulting in uneven metal flow lines after the blank fills the cavity, resulting in large residual stress in the final workpiece, and large anisotropy of microstructure and mechanical properties. During the use of the workpiece, it is easy to fail along the parts with poor mechanical properties, which reduces the service life of the workpiece;

[0004] Especially for workpieces with complex shapes, such as workpieces with thin fins arranged on the periphery of the workpiece body, since the cavity is smaller in volume and narrower in width at the fins, and larger in volume and width at the workpiece body, it is difficult for the blank to flow to the fins of the cavity, and the mechanical properties of the final workpiece will be greatly affected. Summary of the invention

[0005] The object of the present invention is to provide a uniform extrusion die for magnesium-aluminum alloy profiles, which overcomes the above-mentioned defects and enables the blank to flow evenly to the wing of the cavity and the main body of the workpiece during the extrusion process.

[0006] To achieve the above-mentioned purpose, the solution of the present invention is: a uniform extrusion forming die for magnesium-aluminum alloy profiles, comprising a male die assembly installed below an upper die plate of a press, and a female die assembly installed above a lower die plate of the press;

[0007] The male mold assembly is formed with a male mold body protruding downward;

[0008] The female die assembly is provided with a material receiving cavity with a top opening directly below the male die body, the material receiving cavity is for placing the blank and for inserting the male die body downward, the bottom of the material receiving cavity forms an extrusion surface, the extrusion surface is downwardly connected to form a main cavity and a plurality of wing cavities connected around the main cavity, the main cavity and the plurality of wing cavities together form a contour corresponding to the workpiece, the extrusion surface is respectively recessed to form a flow limiting groove between each two adjacent wing cavities, each of the flow limiting grooves forms a first groove surface on the side close to the main cavity to limit the flow of the blank to the main cavity, and forms a second groove surface on the side close to the wing cavity to limit the flow of the blank to the wing cavity.

[0009] Furthermore, the main cavity is a longitudinally extending cylindrical cavity, the fin cavity is a longitudinally extending cuboid cavity, the cross-section of the current-limiting groove is fan-shaped, and the horizontal angle between the two second groove surfaces of a current-limiting groove is greater than or less than the horizontal angle between the two fin cavities adjacent to the current-limiting groove.

[0010] Furthermore, the top of the first groove surface inclines towards the main cavity, the top of the second groove surface inclines towards the adjacent fin cavity, and the inclination angle of the first groove surface is greater than or less than the inclination angle of the second groove surface.

[0011] Furthermore, the extrusion surface is a conical surface that is lower in the middle and higher around or higher in the middle and lower around, and the top end of the main cavity communicates with the center of the extrusion surface.

[0012] Furthermore, a third groove surface is formed on the side of the current-limiting groove facing away from the main cavity, and the height of the third groove surface is greater than or less than the height of the first groove surface.

[0013] Furthermore, a third groove surface is formed on the side of the current-limiting groove facing away from the main cavity, the top of the first groove surface inclines towards the main cavity side, the top of the third groove surface inclines towards the side facing away from the main cavity, and the inclination angle of the first groove surface is greater than or less than the inclination angle of the third groove surface.

[0014] Furthermore, the length of the first groove surface is greater than or less than the length of the second groove surface.

[0015] Furthermore, the first groove surface, the second groove surface, the third groove surface, and the extrusion surface are smoothly transitioned.

[0016] Furthermore, a core rod protrudes downward from the bottom of the punch body, and the core rod is used to insert downward into the main cavity, and a gap for the blank to flow in is left between the core rod and the side wall of the main cavity.

[0017] Furthermore, a ejector rod is longitudinally slidably mounted on the lower template of the press, and the ejector rod is located at the bottom of the main cavity to eject the workpiece upward when inserted into the main cavity.

[0018] After adopting the above solution, the beneficial effects of the present invention are as follows: The female die assembly forms a material-containing cavity with an open top directly below the male die body. The material-containing cavity is for placing the blank and for the male die body to insert downward. The bottom of the material-containing cavity forms an extrusion surface, and the extrusion surface conducts downward to form a main cavity and a plurality of fin-shaped cavities connected around the main cavity. The main cavity and the plurality of fin-shaped cavities together form a contour corresponding to the workpiece. When the male die body inserts into the material-containing cavity, it pushes the blank in the material-containing cavity to deform and flow into the main cavity and each fin-shaped cavity. The extrusion surface respectively concaves downward between every two adjacent fin-shaped cavities to form a flow-limiting groove. Each flow-limiting groove forms a first groove surface that restricts the flow of the blank to the main cavity on the side close to the main cavity and a second groove surface that restricts the flow of the blank to the flow-limiting groove on the side close to the fin-shaped cavity. By configuring the first groove surface and the second groove surface with different inclination angles, heights, lengths, etc., the flow of the blank has different degrees of flow restriction when flowing to the main cavity and each fin-shaped cavity, thereby balancing the flow rates of the blank flowing to the main cavity and each fin-shaped cavity and achieving uniform extrusion forming. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic top view structure diagram of the workpiece after forming in the present invention;

[0020] Figure 2 It is a schematic top view structure diagram of the female die core in the present invention;

[0021] Figure 3 It is a schematic top view cross-sectional structure diagram of the female die core in the present invention;

[0022] Figure 4 It is a schematic cross-sectional structure diagram of the flow-limiting groove along the radial direction of the female die core when h3 is greater than h1 in the present invention;

[0023] Figure 5 It is a schematic structure diagram of the mold before feeding in the present invention;

[0024] Figure 6 It is a schematic structure diagram of the mold after feeding in the present invention;

[0025] Figure 7 It is a schematic structure diagram of the mold after perforation in the present invention;

[0026] Figure 8 It is a schematic structure diagram of the mold after forming in the present invention;

[0027] Figure 9 It is a schematic structure diagram of the mold for the ejector rod to eject the workpiece and the female die core after omitting the upper template of the press and the male die assembly in the present invention;

[0028] Figure 10 It is a schematic three-dimensional structure diagram of the female die core installed in the female die sleeve in the present invention.

[0029] Label description: 1 - upper template of the press, 2 - punch assembly, 3 - lower template of the press, 4 - die assembly, 5 - punch body, 6 - material containing cavity, 7 - blank, 8 - extrusion surface, 9 - main cavity, 10 - fin cavity, 11 - workpiece, 12 - flow limiting groove, 13 - first groove surface, 14 - second groove surface, 15 - third groove surface, 16 - core rod, 17 - ejector rod, 18 - shaft hole, 19 - die core, 20 - die sleeve. Detailed implementation manner

[0030] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0031] The present invention provides a magnesium alloy profile uniform extrusion forming die, as Figure 1-10 shown, including a punch assembly 2 installed and fixed below the upper template 1 of the press, and a die assembly 4 installed and fixed above the lower template 3 of the press. The press drives the upper template 1 of the press and the lower template 3 of the press to open and close, thereby driving the punch assembly 2 and the die assembly 4 to open and close;

[0032] The punch assembly 2 is formed with a punch body 5 protruding downward, and the punch body 5 is in a cylindrical shape; the die assembly 4 forms a material containing cavity 6 with an open top directly below the punch body 5. The material containing cavity 6 is a cylindrical cavity with a diameter slightly larger than that of the punch body 5. The material containing cavity 6 is for placing the blank 7 and for the punch body 5 to insert downward. The bottom of the material containing cavity 6 forms an extrusion surface 8. The extrusion surface 8 is downwardly conducted to form a main cavity 9 and a plurality of fin cavities 10 communicating around the main cavity 9. The main cavity 9 is a longitudinally extending cylindrical cavity, and each of the fin cavities 10 is a longitudinally extending rectangular parallelepiped cavity. Thus, the main cavity 9 and the plurality of fin cavities 10 together form a contour corresponding to the workpiece 11. In this embodiment, a shaft hole 18 is also downwardly conducted in the center of the top of the workpiece 11. In order to simultaneously form the shaft hole 18 in one time, a core rod 16 protrudes downward from the bottom of the punch body 5. The core rod 16 descends with the punch body 5, punches out the shaft hole 18 on the blank 7 located in the material containing cavity 6, and then when the punch body 5 continues to descend, the core rod 16 is used to insert downward into the main cavity 9 and leave a gap for the blank 7 to flow between the core rod 16 and the side wall of the main cavity 9. In a more specific embodiment, for the convenience of manufacturing the die assembly 4, the die assembly 4 includes a die core 19 and a die sleeve 20. The die sleeve 20 is in a cylindrical shape, the top surface of the die core 19 forms the extrusion surface 8, the main cavity 9 and the fin cavities 10 are both opened on the die core 19, and the die core 19 is coaxially and circumferentially fixed in the die sleeve 20, as Figure 2 , Figure 3 , Figure 10As shown, the extrusion surface 8 may be a plane. In a preferred embodiment, in order to make the blank 7 easier to flow into the main cavity 9 and the wing cavity 10, as shown in FIG. Figure 5-9 As shown, the edge of the extrusion surface 8 can also be set as an inwardly inclined slope, which is not specifically limited;

[0033] Due to the restrictions of the shapes and positions of the main cavity 9 and the wing cavity 10, the resistance of the blank 7 to flow into the main cavity 9 and the wing cavity 10 after being extruded is different, resulting in different speeds of the blank 7 flowing to the main cavity 9 and the wing cavity 10. In order to balance the speed of the blank 7 flowing to the main cavity 9 and the wing cavity 10, the extrusion surface 8 is respectively recessed between each two adjacent wing cavities 10 to form a flow limiting groove 12. In order to match the contours formed by the main cavity 9 and the wing cavity 10 on the extrusion surface 8, the cross-section of the flow limiting groove 12 is fan-shaped. Each of the flow limiting grooves 12 forms a first groove surface 13 on the side close to the main cavity 9 to limit the flow of the blank 7 to the main cavity 9, and a groove surface 13 on the side close to the main cavity 9 to limit the flow of the blank 7 to the main cavity 9. A second groove surface 14 is formed on the side of the wing cavity 10 to limit the flow of the blank 7 toward the wing cavity 10, and a third groove surface 15 is formed on the side away from the main cavity 9 to limit the flow of the blank 7 in the direction away from the main cavity 9. The first groove surface 13, the second groove surface 14, the third groove surface 15 and the extrusion surface 8 have a smooth transition. By adjusting the positions and shapes of the first groove surface 13, the second groove surface 14 and the third groove surface 15, the resistance of the blank 7 to flow in various directions is adjusted, so that the blank can flow evenly into the main cavity 9 and the wing cavity 10. The metal streamlines of the workpiece 11 after forming will be more uniform, thereby improving the anisotropy of the mechanical properties of the workpiece 11 and improving the comprehensive mechanical properties of the material.

[0034] Specifically in this embodiment, the focus here is on Figure 2-4 As shown, the height of the first groove surface 13 is h1 and the length is L1. The top of the first groove surface 13 is inclined at an angle of θ1 toward the main cavity 9, and is spaced apart from the main cavity 9 by a distance d1; the length of each of the second groove surfaces 14 is L2, and the top is inclined at an angle of θ2 toward the adjacent airfoil cavity 10 (θ2 is not given in the attached figure), and is spaced apart from the adjacent airfoil cavity 10 by a distance d2, and the horizontal angle between the two second groove surfaces 14 on the same flow limiting groove 12 is w; the height of the third groove surface 15 is h3, and the third groove surface 15 is inclined at an angle of θ3 toward the side away from the main cavity 9.

[0035] The horizontal angle w between the two second groove surfaces 14 of a flow limiting groove 12 is greater than or less than the horizontal angle between the two wing cavities 10 adjacent to the flow limiting groove 12, with particular reference to Figure 3As shown, specifically, when the horizontal angle w between the two second groove surfaces 14 of a current-limiting groove 12 is greater than the horizontal angle between two adjacent fin cavities 10 of the current-limiting groove 12, the end of the second groove surface 14 far from the main cavity 9 is closer to the fin cavity 10 than the end close to the main cavity 9. When the blank 7 is continuously extruded, the part in the current-limiting groove 12 climbs out of the current-limiting groove 12 along the second groove surface 14 and then flows laterally to the adjacent fin cavity 10, and it flows into the end of the fin cavity 10 far from the main cavity 9 faster; conversely, when the horizontal angle w between the two second groove surfaces 14 of a current-limiting groove 12 is less than the horizontal angle between two adjacent fin cavities 10 of the current-limiting groove 12, it flows into the end of the fin cavity 10 close to the main cavity 9 faster. The actual angle of the angle w is specifically adjusted according to the actual forming effect.

[0036] The inclination angle θ1 of the first groove surface 13 is greater than or less than the inclination angle θ2 of the second groove surface 14. Specifically, since the smaller the inclination angles of the first groove surface 13 and the second groove surface 14, the greater the resistance to the lateral flow of the blank 7 in the corresponding direction. When θ1 is greater than θ2, the blank 7 is more likely to flow in the direction of the first groove surface 13, and then flows to the main cavity 9 beside the first groove surface 9 faster; conversely, when θ1 is less than θ2, the blank 7 is more likely to flow in the direction of the second groove surface 14, and then flows to the fin cavity 10 beside the second groove surface 10 faster. The specific values of θ1 and θ2 are specifically set according to the actual forming effect.

[0037] Focusing on Figure 4 As shown, the height h3 of the third groove surface 15 is greater than or less than the height h1 of the first groove surface 13. Specifically, since the greater the heights of the third groove surface 15 and the first groove surface 13, the greater the resistance to the lateral flow of the blank 7 in the corresponding direction. When h3 is greater than h1, the blank 7 is more likely to flow to the main cavity 9; conversely, when h3 is less than h1, the blank 7 is more likely to flow in the direction away from the main cavity 9, and then is more likely to flow to the fin cavities 10 around the main cavity 9. The specific values of h3 and h1 are specifically set according to the actual forming effect.

[0038] Focusing on Figure 4 As shown, the inclination angle θ1 of the first groove surface 13 is greater than or less than the inclination angle θ3 of the third groove surface 15. Specifically, since the greater the inclination angles of the third groove surface 15 and the first groove surface 13, the smaller the resistance to the lateral flow of the blank 7 in the corresponding direction. When θ1 is greater than θ3, the blank 7 is more likely to flow to the main cavity 9; conversely, when θ1 is less than θ3, the blank 7 is more likely to flow in the direction away from the main cavity 9, and then is more likely to flow to the fin cavities 10 around the main cavity 9. The specific values of θ1 and θ3 are specifically set according to the actual forming effect.

[0039] The length L1 of the first groove surface 13 is greater than or less than the length L2 of the second groove surface 14. Specifically, since the greater the lengths of the first groove surface 13 and the second groove surface 14, the greater the resistance to the lateral flow of the blank 7 in the corresponding direction. When L1 > L2, the blank 7 is more likely to flow in the direction where the first groove surface 13 is located, and thus flows faster to the main cavity 9 beside the first groove surface 13; conversely, when L1 < L2, the blank 7 is more likely to flow in the direction where the second groove surface 14 is located, and thus flows faster to the fin cavity 10 beside the second groove surface 14. The specific values of L1 and L2 are specifically set according to the actual forming effect.

[0040] The top of the main cavity 9 is conductively connected to the center of the extrusion surface 8. The extrusion surface 8 can also be a conical surface with a lower middle and higher periphery or a higher middle and lower periphery (not shown in the attached drawing); when the extrusion surface 8 has a lower middle and higher periphery, the blank 7 is more likely to flow towards the center of the extrusion surface 8 and enter the main cavity 9 faster; when the extrusion surface 8 has a higher middle and lower periphery, the blank 7 is more likely to flow towards the edge of the extrusion surface 8 and enter each fin cavity 10 faster.

[0041] In a preferred embodiment, to facilitate the demolding of the blank 7 after forming the workpiece 11, a ejector rod 17 is longitudinally slidably mounted on the lower template 3 of the press. The ejector rod 17 is located at the bottom of the main cavity 9 to jack up the workpiece 11 when inserted upward into the main cavity 9.

[0042] A method for direct extrusion and uniform forming of complex profiles includes the following steps:

[0043] S1. Focusing on combining Figure 5 as shown, set up the above-mentioned die for uniform extrusion forming of magnesium alloy profiles.

[0044] S2. Focusing on combining Figure 6 as shown, feeding: put the blank 7 into the material containing cavity 6.

[0045] S3. Focusing on combining Figure 7 , Figure 8 as shown, forming: make the punch body 5 drive the core rod 16 to move downward, so that the core rod 16 punches out the shaft hole 18 on the blank 7 located in the material containing cavity 6, and then make the punch body 5 continue to move downward and press into the material containing cavity 6 to push the blank 7 in the material containing cavity 6 to flow into the main cavity 9 and the fin cavity 10, and finally fill the main cavity 9 and the fin cavity 10 to form the workpiece 11.

[0046] S4. Focusing on combining Figure 9As shown, blanking: Raise the ejector rod 17 to eject the workpiece 11 upward and take out the workpiece 11. Preferably, in this embodiment, to facilitate the demolding of the workpiece 11, the female die core 19 can be set to be composed of multiple petals. The joining position and the specific number of petals are not specifically limited and are set conventionally, which will not be specifically elaborated in this embodiment. Thus, when ejecting the workpiece 11 upward, the female die core 19 and the workpiece 11 are ejected upward from the female die sleeve 20 together, and then the female die core 19 is opened along the joining place, so that the workpiece 11 can be taken out more conveniently;

[0047] S5. Flow rate adjustment: During step S3, if the speed at which the blank 7 fills the main cavity 9 is greater than the speed at which it fills the fin cavity 10, then increase the ratio of L1 / L2, and / or decrease the ratio of θ1 / θ2, and / or increase the ratio of d1 / d2, and / or decrease the ratio of h3 / h1, and / or decrease the ratio of θ1 / θ3, and / or increase the value of w, so that the blank 7 is more likely to flow into the fin cavity 10; if the speed at which the blank 7 fills the main cavity 9 is less than the speed at which it fills the fin cavity 10, then decrease the ratio of L1 / L2, and / or increase the ratio of θ1 / θ2, and / or decrease the ratio of d1 / d2, and / or increase the ratio of h3 / h1, and / or increase the ratio of θ1 / θ3, and / or decrease the value of w, so that the blank 7 is more likely to flow into the main cavity 9, until the speeds at which the blank 7 fills the main cavity 9 and the fin cavity 10 are equal. At this time, the metal flow line of the formed workpiece 11 will be more uniform, having better isotropy and mechanical properties;

[0048] S6. Repeat steps S2 to S4 until the predetermined number of workpieces 11 are formed.

[0049] In a preferred embodiment, the extrusion surface 8 is a conical surface that is higher in the middle and lower around or lower in the middle and higher around; when the extrusion surface 8 is a conical surface that is higher in the middle and lower around, if the speed at which the blank 7 fills the main cavity 9 is greater than the speed at which it fills the fin cavity 10, then increase the convex height in the middle of the extrusion surface 8, and if the speed at which the blank 7 fills the main cavity 9 is less than the speed at which it fills the fin cavity 10, then decrease the convex height in the middle of the extrusion surface 8; when the extrusion surface 8 is a conical surface that is lower in the middle and higher around, if the speed at which the blank 7 fills the main cavity 9 is greater than the speed at which it fills the fin cavity 10, then decrease the depth of the concave in the middle of the extrusion surface 8, and if the speed at which the blank 7 fills the main cavity 9 is less than the speed at which it fills the fin cavity 10, then increase the depth of the concave in the middle of the extrusion surface 8.

[0050] The above is only a preferred embodiment of the present invention and does not limit the design of this case. All equivalent changes made according to the key design of this case fall within the protection scope of this case.

Claims

1. A magnesium alloy profile uniform extrusion forming die, characterized in that: It comprises a male die assembly (2) installed below an upper die plate (1) of a press machine, and a female die assembly (4) installed above a lower die plate (3) of the press machine; The male mold assembly (2) is formed with a male mold body (5) protruding downward; The female mold assembly (4) is provided with a material receiving cavity (6) with a top opening directly below the male mold body (5), wherein the material receiving cavity (6) is provided for placing the blank (7) and for inserting the male mold body (5) downwardly, and the cavity bottom of the material receiving cavity (6) forms an extrusion surface (8), wherein the extrusion surface (8) is connected downwardly to form a main mold cavity (9) and a plurality of wing mold cavities (10) connected to the periphery of the main mold cavity (9), wherein the main mold cavity (9) and the plurality of wing mold cavities ( 10) together form a profile corresponding to the workpiece (11), the extrusion surface (8) is respectively recessed between each two adjacent winglet cavities (10) to form a flow limiting groove (12), each of the flow limiting grooves (12) forms a first groove surface (13) on the side close to the main cavity (9) to limit the blank (7) from flowing toward the main cavity (9), and forms a second groove surface (14) on the side close to the winglet cavity (10) to limit the blank (7) from flowing toward the winglet cavity (10); The main cavity (9) is a cylindrical cavity extending longitudinally, the wing cavity (10) is a rectangular cavity extending longitudinally, and the cross section of the flow limiting groove (12) is fan-shaped; The flow limiting groove (12) forms a third groove surface (15) on the side facing away from the main cavity (9); The first groove surface (13) has a height of h1 and a length of L1, the top of the first groove surface (13) is inclined at an angle of θ1 toward the main cavity (9), and is spaced from the main cavity (9) by a distance of d1; each of the second groove surfaces (14) has a length of L2, and the top is inclined at an angle of θ2 toward the adjacent wing cavity (10), and is spaced from the adjacent wing cavity (10) by a distance of d2, and the horizontal angle between the two second groove surfaces (14) on the same flow limiting groove (12) is w; the height of the third groove surface (15) is h3, and the third groove surface (15) is inclined at an angle of θ3 toward the side away from the main cavity (9); If the speed at which the blank (7) fills the main cavity (9) is greater than the speed at which it fills the fin cavity (10), the ratio of L1 / L2 is increased, and / or the ratio of θ1 / θ2 is decreased, and / or the ratio of d1 / d2 is increased, and / or the ratio of h3 / h1 is decreased, and / or the ratio of θ1 / θ3 is decreased, and / or the value of w is increased, so that the blank (7) can flow more easily to the fin cavity (10); if the blank (7) fills the main cavity (9) If the speed is less than the speed of filling the wing cavity (10), the ratio of L1 / L2 is reduced, and / or the ratio of θ1 / θ2 is increased, and / or the ratio of d1 / d2 is reduced, and / or the ratio of h3 / h1 is increased, and / or the ratio of θ1 / θ3 is increased, and / or the value of w is reduced, so that the blank (7) can flow more easily to the main cavity (9), until the speed at which the blank (7) fills the main cavity (9) and the wing cavity (10) is equal.

2. The uniform extrusion forming die for a magnesium alloy profile according to claim 1, wherein: The main cavity (9) is a longitudinally extending cylindrical cavity, the wing cavity (10) is a longitudinally extending rectangular cavity, the cross section of the flow limiting groove (12) is fan-shaped, and the horizontal angle between two second groove surfaces (14) of a flow limiting groove (12) is greater than or less than the horizontal angle between two wing cavities (10) adjacent to the flow limiting groove (12).

3. The uniform extrusion forming die for a magnesium alloy profile according to claim 1, characterized in that: The top of the first groove surface (13) is inclined toward the main cavity (9), and the top of the second groove surface (14) is inclined toward the wing cavity (10) adjacent thereto, and the inclination angle of the first groove surface (13) is greater than or less than the inclination angle of the second groove surface (14).

4. The uniform extrusion forming die for a magnesium alloy profile according to claim 1, wherein: The extrusion surface (8) is a conical surface with a low middle and high surroundings or a high middle and low surroundings, and the top end of the main cavity (9) is connected to the center of the extrusion surface (8).

5. The uniform extrusion forming die for a magnesium alloy profile according to claim 1, characterized in that: The flow limiting groove (12) forms a third groove surface (15) on the side facing away from the main cavity (9), and the height of the third groove surface (15) is greater than or less than the height of the first groove surface (13).

6. The uniform extrusion forming die for a magnesium alloy profile according to claim 1, characterized in that: The flow limiting groove (12) forms a third groove surface (15) on the side facing away from the main cavity (9); the top of the first groove surface (13) is inclined toward the side of the main cavity (9); the top of the third groove surface (15) is inclined toward the side facing away from the main cavity (9); and the inclination angle of the first groove surface (13) is greater than or less than the inclination angle of the third groove surface (15).

7. The uniform extrusion forming die for a magnesium alloy profile according to claim 1, characterized in that: The length of the first groove surface (13) is greater than or less than the length of the second groove surface (14).

8. The uniform extrusion forming die for a magnesium alloy profile according to claim 7, wherein: There is a smooth transition between the first groove surface (13), the second groove surface (14), the third groove surface (15) and the extrusion surface (8).

9. The uniform extrusion forming die for a magnesium alloy profile according to claim 1, characterized in that: The bottom of the male mold body (5) is convexly formed with a core rod (16), which is used to be inserted downward into the main cavity (9) and has a gap between the core rod (16) and the side wall of the main cavity (9) for the blank (7) to flow in.

10. The uniform extrusion forming die for a magnesium alloy profile according to claim 1, wherein: A push rod (17) is longitudinally slidably mounted on the lower mold plate (3) of the press, and the push rod (17) is located at the bottom of the main cavity (9) so as to push out the workpiece (11) when the workpiece is inserted upward into the main cavity (9).

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