Forming die of thin-wall beam and die assembly

Abstract

The utility model provides a forming die of a thin-wall beam and a die assembly, which can improve the rebound cracking problem of the thin-wall beam and reduce the production cost. The forming die comprises a female die, the female die is provided with a first molded surface facing a male die, the female die further comprises drawing ridges or concave parts located on the two sides of the first molded surface in the width direction, the female die further comprises a first abutting face facing the male die, and the first abutting face is located on the side, away from the first molded surface in the width direction, of the drawing ridges of the female die; or the first pressing surface is positioned on one side, far away from the first molded surface, of the concave part of the concave die in the width direction; relative to the first molded surface and the first pressing surface, the drawing ridge of the female die protrudes towards the male die, or the concave part of the female die is sunken towards the direction far away from the male die; the male die is provided with a second molded surface facing the female die, the first molded surface is matched with the second molded surface, the male die is further provided with a second abutting surface facing the female die, and the second abutting surface is used for abutting against the first abutting surface; the male die further comprises a concave part matched with the drawing ridge of the female die, or the male die further comprises a drawing ridge matched with the concave part of the female die.

Description

Technical Field

[0001] The present application relates to the field of forming technology, and in particular to a forming die and a die assembly for a thin-walled beam. Background Art

[0002] Thin-walled beams are a common type of mechanical component. For example, they form many important parts of automobile bodies. Furthermore, to balance lightweighting and strength requirements, thin-walled beams made of high-strength materials are increasingly being used in the body structures of new energy vehicles.

[0003] Some thin-walled beam parts are not flat structures, but have a certain depth. For such thin-walled beam parts, the conventional processing technology is stamping technology. The blanking process is relatively complicated and the formability is relatively poor. The parts have the problem of rebound cracking, and the production cost is relatively high. Utility Model Content

[0004] The purpose of this application is to provide a forming die and die assembly for thin-walled beams, which can improve the rebound cracking problem of thin-walled beams and reduce production costs.

[0005] To solve the above technical problems, the present application provides a forming die for a thin-walled beam, comprising:

[0006] A die, wherein the die has a first profile facing the punch, the die further comprising drawing ridges or recessed portions located on both sides of the first profile in a width direction, and the die further comprising a first pressing surface facing the punch, the first pressing surface being located on a side of the die's drawing ridge that is away from the first profile in the width direction, or the first pressing surface being located on a side of the recessed portion of the die that is away from the first profile in the width direction; relative to the first profile and the first pressing surface, the die's drawing ridge is convex toward the punch, or the recessed portion of the die is concave in a direction away from the punch; the first profile, the first pressing surface, and the die's drawing ridge or the recessed portion are integrally formed;

[0007] A punch, wherein the punch has a second profile facing the die, the first profile and the second profile match, and the punch further has a second pressing surface facing the die, the second pressing surface being used to press against the first pressing surface; the punch further includes a recessed portion matching the drawing ridge of the die, or the punch further includes a drawing ridge matching the recessed portion of the die; the second profile, the second pressing surface and the recessed portion of the punch or the drawing ridge of the punch are integrally arranged.

[0008] Optionally, the depth of the depression of the first profile is not greater than the width of the first profile.

[0009] Optionally, the depth of the depression of the first profile is not greater than half of the width of the first profile.

[0010] Optionally, the depth H of the depression of the first profile is ≤ 90 mm, and the width W of the first profile is ≤ 180 mm.

[0011] Optionally, the die further comprises a first transition surface, which connects the first profile and the drawing ridge of the die, or connects the first profile and the concave portion of the die; the punch further comprises a second transition surface, which connects the second profile and the concave portion of the punch, or connects the second profile and the drawing ridge of the punch.

[0012] Optionally, the width of the first transition surface and the second transition surface is greater than 6 mm.

[0013] Optionally, the ratio of the height to the width of the draw channel is in the range of 0.7 to 1.3.

[0014] Optionally, the height of the draw ridge is in the range of 10-15 mm, and the width of the draw ridge is in the range of 11-14 mm.

[0015] Optionally, the first profile has a first side and a second side in the width direction;

[0016] The angle between the first side and the vertical direction is an obtuse angle, and the width of the first transition surface connecting the first side is not less than the width of the drawing ridge of the die or the concave portion of the die on the corresponding side; and / or, the angle between the second side and the vertical direction is an obtuse angle, and the width of the first transition surface connecting the second side is not less than the width of the drawing ridge of the die or the concave portion of the die on the corresponding side.

[0017] The present application also provides a mold assembly, comprising the forming mold for the thin-walled beam described in any one of the above items;

[0018] The mold assembly also includes a combination mold, which includes a first trimming mold, a second trimming mold and a punching mold. The punching mold is arranged between the first trimming mold and the second trimming mold. The first trimming mold is used to cut off one side edge in the width direction of the thin-walled beam blank formed by the forming mold, and the second trimming mold is used to cut off the other side edge in the width direction of the thin-walled beam blank. The punching mold is used to punch the thin-walled beam blank.

[0019] The forming die in this application is provided with a concave portion and a drawing ridge that cooperate with each other. The drawing ridge can provide feeding resistance for the sheet of thin-walled beam during the stamping process of the forming die, so that the sheet is fully stretched to improve the formability of the thin-walled beam, meet the dimensional quality requirements of the thin-walled beam, improve the rigidity of the product, and improve the rebound cracking of the product. At the same time, a first pressing surface and a second pressing surface are provided on one side of the drawing ridge to press the sheet and ensure the stable stretching of the sheet during the drawing process. Moreover, the first pressing surface, the drawing ridge, and the first molding surface are integrated, and the second pressing surface, the concave portion, and the second molding surface are also integrated. In this way, the pressing and forming of the die are all realized on one structure. Similarly, the pressing and forming of the punch are also all realized on one structure. The structure of the forming die is also relatively simple, the production cost is low, and the maintenance cost of the forming die is also low.

[0020] The mold assembly in this application includes the above-mentioned molding mold, and has the same technical effect as the molding mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a forming die for a thin-walled beam in one embodiment of the present application;

[0022] Figure 2 for Figure 1 Enlarged view of the middle part;

[0023] Figure 3 for Figure 1 Schematic diagram of the local position of the upper side of the middle die;

[0024] Figure 4 for Figure 3 Schematic diagram of the structure of the upper surface of the concave die and the formed thin-walled beam thereon;

[0025] Figure 5 for Figure 1 Schematic diagram of the structure of the thin-walled beam formed by the forming die;

[0026] Figure 6 for Figure 1 Schematic diagram of the structure of the concave die;

[0027] Figure 7 for Figure 6 Cross-sectional view of the die along the width direction;

[0028] Figure 8 for Figure 7 Enlarged view of part B in the middle;

[0029] Figure 9 Schematic diagram of the structure of the upper surface of the die and the formed thin-walled beam thereon in another embodiment of the present application;

[0030] Figure 10for Figure 9 Schematic diagram of the structure of a medium thin-walled beam, which is specifically the inner plate of the crossbeam of an automobile;

[0031] Figure 11 This is a schematic structural diagram of a combined mold of a mold assembly in one embodiment of the present application.

[0032] The following are the descriptions of the reference numerals:

[0033] 1000-forming mold;

[0034] 100 - punch; 101 - second molding surface; 102 - recess; 103 - second pressing surface; 104 - second transition surface;

[0035] 200 - die; 201 - first molding surface; 2011 - first side; 2011a - first edge; 2012 - second side; 2012a - second edge; 202 - drawing edge; 203 - first pressing surface; 204 - first transition surface; 205 - recess;

[0036] 2000 - combination die; 21 - first trimming die; 211 - first trimming portion; 212 - third oblique punching portion; 213 - fourth oblique punching portion; 23 - second trimming die; 231 - second trimming portion; 232 - second side punching portion;

[0037] 3000-plate; 3000'-thin-walled beam; 3001-side of the first beam; 3002-side of the second beam. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] In the embodiments of the present application, the terms "first" and "second" are only used to distinguish features with the same or similar structures, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0040] Please refer to Figures 1 to 5 , Figure 1 This is a schematic structural diagram of a forming die 1000 for a thin-walled beam in one embodiment of the present application; Figure 2 for Figure 1 Enlarged view of the middle part; Figure 3 for Figure 1 Schematic diagram of the local position of the upper side of the middle die 200; Figure 4 for Figure 3 A schematic structural diagram of the upper surface of the middle die 200 and the formed thin-walled beam thereon; Figure 5 for Figure 1Schematic diagram of the structure of the thin-walled beam 3000' formed by the intermediate forming die 1000.

[0041] In an embodiment of the present application, a thin-walled beam forming die 1000 is provided. The forming die 1000 is used to form a thin-walled beam 3000'. The thin-walled beam 3000' is a relatively thin plate-like structure. Figure 5 The thin-walled beam 3000' shown in the figure is a thin-walled beam of an automobile, specifically a front crossbeam of a car roof. The thickness D of the thin-walled beam 3000' formed by the forming mold 1000 in this embodiment is, for example, approximately 0.7-1.2 mm, which is relatively thin. The forming mold 1000 used is a drawing die.

[0042] The forming die 1000 is as follows Figure 1 As shown, it includes a female mold 200 and a male mold 100, Figure 1 The die 200 is the lower die, and the punch 100 is the upper die. During processing, the sheet is first obtained according to the thin-walled beam 3000'. The sheet can be formed into a relatively regular shape through simple cutting, stamping and other processes as the sheet to be drawn. The sheet is placed on the die 200, and then the punch 100 gradually approaches the die 200. After the die is closed, it is gradually pressed, so that the sheet is drawn to form a thin-walled beam blank 3000 of the thin-walled beam 3000'.

[0043] like Figure 3 As shown, the die 200 of the forming mold 1000 has a first molding surface 201 facing the punch 100. The first molding surface 201 is a portion of the upper surface of the die 200. The first molding surface 201 is identical to one side surface of the thin-walled beam 3000' to be formed and is located approximately in the middle of the die 200. The die 200 also includes draw ridges 202 located on either side of the first molding surface 201 in the width direction. Specifically, one draw ridge 202 is provided on one side of the first molding surface 201 in the width direction, and another draw ridge 202 is provided on the other side of the first molding surface 201 in the width direction. Furthermore, the die 200 also includes a first pressing surface 203 facing the punch 100. The first pressing surface 203 is located on the side of the draw ridge 202 that is away from the first molding surface 201 in the width direction. Each draw ridge 202 is equipped with a first pressing surface 203, and the two first pressing surfaces 203 on either side are approximately flush in the height direction. Relative to the first molding surface 201 and the first pressing surface 203, the drawing ridge 202 is protruded toward the punch 100. Figure 3 、 4 As shown, the draw channel 202 is convex upward.

[0044] Combine Figure 2It is understood that, to match the die 200, the punch 100 has a second profile 101 facing the die 200, the first profile 201 and the second profile 101 are adapted, and the second profile 101 is the same as the other side surface of the thin-walled beam 3000'. In this way, after the first profile 201 and the second profile 101 are clamped and pressurized, the plate between the two will be stretched and deformed into the shape of the thin-walled beam 3000'. At the same time, the punch 100 also has a second pressing surface 103 facing the die 200 and a recessed portion 102. The recessed portion 102 is recessed in the direction away from the die 200. The second pressing surface 103 is used to adapt to and press against the first pressing surface 203. The recessed portion 102 is adapted to the drawing ridge 202. That is, after the die 200 and the punch 100 are clamped, the first pressing surface 203 and the second pressing surface 103 are in Figure 1 From the perspective shown, they press against each other in the up and down directions, and the draw ridge 202 is inserted into the recess 102 . The height and width of the draw ridge 202 are substantially equal to the height and width of the recess 102 .

[0045] For details, please refer to Figure 2 It is understood that the left side of the first profile 201 of the concave portion 200 is a draw ridge 202 (the right side draw ridge 202 is shown in FIG. Figure 1 ), the width of the sheet material used to process the thin-walled beam 3000' must be greater than the width of the first profile 201 and the second profile 101, and a portion of the sheet material will be clamped between the first pressing surface 203 and the second pressing surface 103. The drawn sheet material (i.e., the thin-walled beam blank 3000) can be divided into five parts: the first part is located between the first profile 201 and the second profile 101, the second part is located between a set of drawing ridges 202 and recesses 102, the third part is located between a set of first pressing surfaces 203 and second pressing surfaces 103, the fourth part is located between another set of drawing ridges 202 and recesses 102, and the fifth part is located between another set of first pressing surfaces 203 and second pressing surfaces 103. Figure 1 shown.

[0046] The forming die 1000 in this embodiment is equipped with a cooperating recess 102 and a draw ridge 202. During the stamping process of the forming die 1000, the draw ridge 202 provides resistance to the sheet material of the thin-walled beam 3000', allowing the sheet material to be fully stretched, thereby improving the formability of the thin-walled beam 3000', meeting the dimensional quality requirements of the thin-walled beam 3000', and increasing the rigidity of the product. Furthermore, a first pressing surface 203 and a second pressing surface 103 are provided on one side of the draw ridge 202 to press the sheet material and ensure stable stretching of the sheet material during the drawing process. Moreover, the first pressing surface 203, the drawing ridge 202 and the first molding surface 201 are integrally arranged, and the second pressing surface 103, the recessed portion 102 and the second molding surface 101 are also integrally arranged. In this way, the pressing and forming of the die 200 are all achieved on one structure. Similarly, the pressing and forming of the punch 100 are also achieved on one structure. The structure of the molding die 1000 is also relatively simple, the production cost is low, and the maintenance cost of the molding die 1000 is also low.

[0047] like Figure 4 As shown, the depth H of the recessed first molding surface 201 of the die 200 in this embodiment can be set to be no greater than the width W of the first molding surface 201. The depth H is actually the depth of the thin-walled beam 3000', and the width W is actually the width of the thin-walled beam 3000'. As previously mentioned, the structure used to press the sheet material in this embodiment is the first pressing surface 203 and the second pressing surface 103. The first pressing surface 203 and the draw ridge 202 are integrally provided, and the second pressing surface 103 and the recess 102 are integrally provided. Therefore, the mutual pressure between the first pressing surface 203 and the second pressing surface 103 is also limited by the cooperation between the draw ridge 202 and the recess 102. That is, once the draw ridge 202 and the recess 102 are tightly abutted, the pressure between the first pressing surface 203 and the second pressing surface 103 no longer increases. Therefore, the pressure provided by the first pressing surface 203 and the second pressing surface 103 after the mold is closed is subject to a certain limit. Here, H≤W is set, that is, the entire first profile 201 is not concave to a large extent, so the force required to press the plate by the first pressing surface 203 and the second pressing surface 103 is relatively low, which can better adapt to the forming of this type of thin-walled beam 3000'.

[0048] Specifically, the depth H of the depression of the first profile 201 can be set to no greater than one-half of the width W of the first profile 201. This means that the first profile 201 is relatively flatter, and accordingly, the thin-walled beam 3000' to be processed can be a relatively flat structure. This is more conducive to ensuring the reliability of the first and second pressure surfaces 203 and 103 in clamping the sheet metal. More specifically, for example, the depth H of the depression of the first profile 201 is ≤ 90 mm, and the width W of the first profile 201 is ≤ 180 mm. This specifically limits the overall dimensions of the first profile 201. Within these dimensions, the first and second pressure surfaces 203 and 103, as well as the draw ridge 202, are fully functional.

[0049] In addition, you can continue to refer to Figure 3 、 4 , and combined with Figures 6 to 8 understand, Figure 6 for Figure 1 A schematic structural diagram of the concave die 200; Figure 7 for Figure 6 A cross-sectional view of the middle die 200 along the width direction; Figure 8 for Figure 7 Magnified view of area B.

[0050] The die 200 in this embodiment further includes a first transition surface 204, which connects the first molding surface 201 and the draw ridge 202 in the width direction. The punch 100 further includes a second transition surface 104, which connects the second molding surface 101 and the recess 102 in the width direction. As mentioned above, the draw ridge 202 is convex relative to the first molding surface 201, and correspondingly, the recess 102 is concave relative to the second molding surface 101. Figure 2 From a viewing angle, the recess 102 is recessed upward. The edges of the first and second profiles 201, 101 correspond to the edges of the thin-walled beam 3000'. The portion where the draw ridge 202 and the recess 102 cooperate is used to provide resistance to sheet material feeding. Processing wrinkles may appear on the edges of the draw ridge 202 and the recess 102 of the thin-walled beam blank 3000. If the first profile 201 and the draw ridge 202 are directly connected, and the recess 102 and the second profile 101 are directly connected, these wrinkles may affect the forming quality of the thin-walled beam 3000'. Therefore, the provision of the first and second transition surfaces 204, 104 can weaken or even eliminate the influence of the position of the draw ridge 202 on the forming of the sheet material from extending to the thin-walled beam 3000', thereby better ensuring the forming quality of the thin-walled beam 3000'.

[0051] For example, the width k of the first transition surface 204 and the second transition surface 104 is set to be greater than 6 mm. If the width k of the first transition surface 204 and the second transition surface 104 is too narrow, the above-mentioned transition effect will not be obvious. Setting the width k to be greater than 6 mm is conducive to ensuring the optimization of the forming quality of the thin-walled beam 3000'.

[0052] Please continue to refer to Figure 9 and Figure 10 understand, Figure 9 This is a schematic structural diagram of the upper surface of the die 200 and the formed thin-walled beam 3000' thereon in another embodiment of the present application; Figure 10 for Figure 9 Schematic diagram of the structure of a medium thin-walled beam 3000', which is specifically an inner panel of a crossbeam of an automobile.

[0053] In this embodiment, the draw ridge is provided on the punch 100 (not shown in the figure), and the die 200 is provided with a recess 205 corresponding to the draw ridge 202, and the recess 205 is recessed in a direction away from the punch. Figure 9 The middle is concave downward, which is understandable. Figure 4 In the embodiment, the drawing ridge 202 is provided on the punch 100 and the recess 102 is provided on the die 200. Similarly, Figure 9 It is also possible to set the recess 205 to the punch and the drawing ridge to the die 200, because the recess and the drawing ridge cooperate with each other, and one can be set on the die 200 and the other can be set on the punch 100. The embodiment of the present application is not limited to this.

[0054] It can be defined that the first profile 201 has a first side 2011 and a second side 2012 in the width direction, corresponding to Figure 10 The first beam side 3001 and the second beam side 3002 of the medium thin-walled beam 3000'. The edge of the first side 2011 is the first edge 2011a, and the edge of the second side 2012 is the second edge 2012a. Figure 9 The first edge 2011a is the left edge of the first profile 201, and the second edge 2012a is the right edge of the first profile 201. After the sheet is drawn to obtain the thin-walled beam blank 3000, it is necessary to cut along the first edge 2011a and the second edge 2012a to remove excess portions to obtain the desired thin-walled beam 3000'.

[0055] in, Figure 9 The angle α between the second side 2012 of the first mold surface 201 and the vertical direction facing the second mold surface of the punch is an obtuse angle, and the angle β between the first side 2011 and the vertical direction facing the second mold surface of the punch is an acute angle. When the angle is an obtuse angle, the side of the first mold surface 201 is relatively steep, while when the angle is an acute angle or zero, the side is relatively horizontal. Figure 9 As can be seen, the first side 2011 corresponds to the flange of the first molding surface 201, while the second side 2012 extends generally vertically. For steeper side edges, if the first transition surface 204 is narrow, the first transition surface 204 and the adjacent recess 102 (or draw ridge 202) will form a continuous concave-convex structure, which will significantly increase the resistance to sheet material feeding. In this case, the width k of the first transition surface 204 corresponding to the side edge with an obtuse angle can be set to be no less than the width d of the corresponding draw ridge 202 or recess 102.

[0056] Figure 9 In this example, the width k of the first transition surface 204 connecting the second side 2012 and the recess 205 is set to be no less than the width d of the recess 205. It is understood that if the angle between the first side 2011 and the vertical is also obtuse, the width k of the first transition surface 204 connecting the first side 2011 can also be set to be greater than the width d of the recess 205. This allows for a smoother transition between the first side 2011 or the second side 2012 and the recess 102 (or the draw ridge 202), thereby achieving appropriate feeding resistance. It is understood that the punch 100 and the die 200 are in a cooperative relationship, and the dimensions of the first transition surface 204 are the same as those of the second transition surface 104. The dimensions of the punch 100 will not be discussed further.

[0057] Furthermore, with respect to the above embodiment, the ratio of the height h to the width d of the draw ridge 202 can be set to a range of 0.7 to 1.3. This means that the draw ridge 202 is roughly square and neither too thick nor too narrow. A thicker shape would not effectively improve the sheet material's feeding resistance, while a narrow shape would result in excessive feeding resistance. When the ratio of the height to the width of the draw ridge 202 is within a range of 0.7 to 1.3, the draw ridge 202 can provide a relatively suitable feeding resistance. For example, the height h of the draw ridge 202 can be set to a range of 10 to 15 mm, and the width d of the draw ridge 202 can be set to a range of 11 to 14 mm. This means that the height h and width d of the draw ridge 202 are limited in specific dimensions. Within this range, the draw ridge 202 and the recesses 102 and 205 can achieve a relatively suitable feeding resistance for the sheet material.

[0058] This application embodiment also provides a mold assembly, including the forming mold 1000 of the thin-walled beam 3000 ′ in any of the above embodiments. The mold assembly has the same technical effects as the above forming mold 1000 and will not be described in detail.

[0059] In addition, the mold assembly also includes Figure 11 Please refer to the combination mold 2000 shown. Figure 11 , Figure 11This is a structural diagram of a combined mold 2000 of a mold assembly in one embodiment of the present application.

[0060] The combined die 2000 includes a first trimming die 21, a second trimming die 23, and a punching die. The punching die is disposed between the first trimming die 21 and the second trimming die 23. The first trimming die 21 is used to trim the side edges of the thin-walled beam blank 3000 formed by the forming die 1000 in the width direction. The first trimming die 21 specifically includes a first trimming portion 211, which is used to trim one side edge of the thin-walled beam blank 3000 and extends along the length of the first trimming die 21. The second trimming die 23 is used to trim the other side edge of the thin-walled beam blank 3000 in the width direction. The second trimming die 23 specifically includes a second trimming portion 231, which is used to trim the other side edge of the thin-walled beam blank 3000 and extends along the length of the second trimming die 23.

[0061] The punching die is used to punch the thin-walled beam blank 3000. The punching die includes a first side punching portion 221, a first oblique punching portion 222, and a second oblique punching portion 223. Figure 10 As shown, the first trimming die 21 in this embodiment also includes a third oblique punching portion 212 and a fourth oblique punching portion 213, and the second trimming die 23 includes a second side punching portion 232. This means that the trimming die is also used for punching. Thus, in this embodiment, combining trimming and punching in a single combined die 2000 can reduce process steps, streamline the number and structure of dies, improve production efficiency, and reduce production costs.

[0062] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A forming die for a thin-walled beam, characterized in that: include: A die, wherein the die has a first profile facing the punch, the die further comprising drawing ridges or recessed portions located on both sides of the first profile in a width direction, and the die further comprising a first pressing surface facing the punch, the first pressing surface being located on a side of the die's drawing ridge that is away from the first profile in the width direction, or the first pressing surface being located on a side of the recessed portion of the die that is away from the first profile in the width direction; relative to the first profile and the first pressing surface, the die's drawing ridge is convex toward the punch, or the recessed portion of the die is concave in a direction away from the punch; the first profile, the first pressing surface, and the die's drawing ridge or the recessed portion are integrally formed; A punch, wherein the punch has a second profile facing the die, the first profile and the second profile match, and the punch further has a second pressing surface facing the die, the second pressing surface being used to press against the first pressing surface; the punch further includes a recessed portion matching the drawing ridge of the die, or the punch further includes a drawing ridge matching the recessed portion of the die; the second profile, the second pressing surface and the recessed portion of the punch or the drawing ridge of the punch are integrally arranged.

2. The forming die for thin-walled beam according to claim 1, characterized in that: The depth of the depression of the first profile surface is not greater than the width of the first profile surface.

3. The forming die for thin-walled beam according to claim 2, characterized in that: The depth of the depression of the first profile surface is no greater than half of the width of the first profile surface.

4. The forming die for thin-walled beam according to claim 3, characterized in that: The depth H of the first profile is less than or equal to 90 mm, and the width W of the first profile is less than or equal to 180 mm.

5. The forming die for a thin-walled beam according to any one of claims 1 to 4, characterized in that: The die further includes a first transition surface, which connects the first profile and the drawing edge of the die, or connects the first profile and the concave portion of the die; the punch further includes a second transition surface, which connects the second profile and the concave portion of the punch, or connects the second profile and the drawing edge of the punch.

6. The forming die for thin-walled beam according to claim 5, characterized in that: The width of the first transition surface and the second transition surface is greater than 6 mm.

7. The forming die for a thin-walled beam according to any one of claims 1 to 4, characterized in that: The ratio of the height to the width of the draw channel is in the range of 0.7 to 1.

3.

8. The forming die for thin-walled beam according to claim 7, characterized in that: The height of the draw ridge is in the range of 10-15 mm, and the width of the draw ridge is in the range of 11-14 mm.

9. The forming die for a thin-walled beam according to any one of claims 1 to 4, characterized in that: The first profile has a first side and a second side in the width direction; The angle between the first side and the vertical direction is an obtuse angle, and the width of the first transition surface connecting the first side is not less than the width of the drawing ridge of the die on the corresponding side or the width of the recessed portion of the die; and / or, the angle between the second side and the vertical direction is an obtuse angle, and the width of the first transition surface connecting the second side is not less than the width of the drawing ridge of the die on the corresponding side or the width of the recessed portion of the die.

10. A mold assembly, characterized in that: A forming die comprising the thin-walled beam according to any one of claims 1 to 9; The mold assembly also includes a combination mold, which includes a first trimming mold, a second trimming mold and a punching mold. The punching mold is arranged between the first trimming mold and the second trimming mold. The first trimming mold is used to cut off one side edge in the width direction of the thin-walled beam blank formed by the forming mold, and the second trimming mold is used to cut off the other side edge in the width direction of the thin-walled beam blank. The punching mold is used to punch the thin-walled beam blank.

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