Sheet die

Abstract

A sheet die comprises a die core, the die core comprises a base part and an extrusion part, a first direction is defined to be perpendicular to the base part, the extrusion part at least comprises a first extrusion area, the extrusion part comprises a second extrusion area, the maximum distance between the first extrusion area and the base part is defined as D1 in the first direction, the maximum distance between the second extrusion area and the base part is defined as D2, D1 is larger than D2, and D2 is larger than D2. Defining a second direction perpendicular to the first direction, along which the second extrusion region is closer to the base than the first extrusion region; and the error of size reduction caused by material thinning during extrusion forming of the plate is compensated, the height error of the plate at the extrusion part is reduced, and the size precision of the formed plate is improved.

Description

Technical Field

[0001] This application relates to the technical field of thermal management, and particularly relates to a sheet mold. Background Art

[0002] The sheet mold includes two mold cores. The sheet is placed between the two mold cores and extruded into shape. During the extrusion process, the sheet at the convex part of the mold core thins, and then a convex with a certain height is formed on the sheet. Since the mold core is usually set to have the same structure as the sheet surface, the material thinning degree of the material around the center of the sheet convex is the largest. Limited by the sheet thickness, the convex height at the center of the sheet convex is usually less than the designed height, resulting in dimensional errors. Summary of the Invention

[0003] The purpose of this application is to provide a sheet mold that improves the dimensional accuracy of the sheet.

[0004] An embodiment of this application provides a sheet mold, including a mold core. The mold core includes a base part and an extrusion part. Define the first direction as the direction perpendicular to the base part. The extrusion part includes at least one first extrusion area. The extrusion part includes a second extrusion area. Along the first direction, define the maximum distance between the first extrusion area and the base part as D1, and the maximum distance between the second extrusion area and the base part as D2. D1 is greater than D2. Define the second direction perpendicular to the first direction. Along the second direction, the second extrusion area is closer to the base part than the first extrusion area.

[0005] In the above technical solution, the mold core has a first extrusion area and a second extrusion area. Along the first direction, the distance between the second extrusion area and the base part is less than the distance between the first extrusion area and the base part. And along the second direction, the second extrusion area is closer to the base part than the first extrusion area. That is, along the second direction, the first heat exchange area far from the base part has a greater convex or concave distance in the first direction than the second heat exchange area close to the base part, causing a greater degree of sheet deformation at the corresponding position of the sheet, compensating for the dimensional reduction error caused by material thinning during sheet extrusion forming, reducing the sheet height error at the extrusion part, and improving the dimensional accuracy of the sheet after forming.

[0006] An embodiment of this application provides a sheet mold, including a first mold core and a second mold core. The first mold core includes a first base part, a first extrusion part, and an avoidance part. The first extrusion part is recessed or protruded from the first base part. Define the first direction as the direction perpendicular to the first base part. Along the first direction, the distance between at least part of the first base part and the second mold core is less than the distance between the avoidance part and the second mold core, and / or, the distance between at least part of the first extrusion part and the second mold core is less than the distance between the avoidance part and the second mold core.

[0007] In the above technical solution, the first die core includes an avoidance portion, and the distance between at least a part of the first base portion and the second die core is less than the distance between the avoidance portion and the second die core. When the first die core abuts against the second die core, there is no contact between the avoidance portion and the second die core. As a result, the avoidance portion does not play a role in pressing the sheet, and the material of the sheet at the avoidance portion is more likely to be thinned, compensating for the material thinning at the convex portion of the sheet, reducing the dimensional error of the sheet at the first extrusion portion, and thus improving the dimensional accuracy of the sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a schematic three-dimensional structure diagram of the sheet die of the present application;

[0009] Figure 2 is Figure 1 a schematic three-dimensional structure diagram of the middle die core;

[0010] Figure 3 is a schematic structure diagram of the first die core and the second die core in a separated state in the first embodiment of the present application;

[0011] Figure 4 is a schematic cross-sectional structure diagram of the first die core and the second die core in the first embodiment of the present application;

[0012] Figure 5 is Figure 4 a schematic cross-sectional structure diagram of the first die core, the second die core and the sheet;

[0013] Figure 6 is Figure 3 a schematic top view structure diagram of the first die core;

[0014] Figure 7 is Figure 3 a schematic cross-sectional structure diagram of the first die core;

[0015] Figure 8 is Figure 7 a schematic enlarged structure diagram of part A;

[0016] Figure 9 is Figure 3 a schematic top view structure diagram of the second die core;

[0017] Figure 10 is Figure 3 a schematic cross-sectional structure diagram of the second die core;

[0018] Figure 11 is Figure 10 a schematic enlarged structure diagram of part B;

[0019] Figure 12 is Figure 3 a schematic diagram of the first positional relationship among the first extrusion area, the second extrusion area and the base;

[0020] Figure 13 is Figure 3 a schematic diagram of the second positional relationship among the first extrusion zone, the second extrusion zone, and the base in

[0021] Figure 14 is Figure 6 a schematic diagram of the structure of the first extrusion part in

[0022] Figure 15 is Figure 9 a schematic diagram of the structure of the second extrusion part in

[0023] Figure 16 a schematic cross-sectional structure diagram of the first die core and the second die core in the second embodiment of the present application;

[0024] Figure 17 a schematic diagram of the structure of the first die core and the second die core in a separated state in the third embodiment of the present application;

[0025] Figure 18 is Figure 17 a schematic diagram of the structure of one implementation manner of the first extrusion part in

[0026] Figure 19 is Figure 17 a schematic diagram of the structure of another implementation manner of the first extrusion part in

[0027] Figure 20 a schematic cross-sectional structure diagram of the first die core and the second die core in the third embodiment of the present application.

[0028] Description of reference numerals:

[0029] 10. Die core; 111. First die core; 1111. First base; 1112. First extrusion part; 11121. First sub-turbulent flow area; 11122. Second sub-turbulent flow area; 11123. First top; 11124. Second top; 11125. First side; 112. Second die core; 1121. Second base; 1122. Second extrusion part; 1123. Fitting part; 11221. Third sub-turbulent flow area; 11222. Fourth sub-turbulent flow area; 11223. First bottom; 11224. Second bottom; 11225. Second side; 113. Extrusion part; 1131. First extrusion zone; 1132. Second extrusion zone; 114. Base; 115. Edge; 12. Plate; 1113. Avoidance part. Detailed implementation manners

[0030] Now, specific embodiments will be described in detail with reference to the accompanying drawings. To fully understand the present invention, numerous specific details are mentioned in the following detailed description. However, those skilled in the art should understand that the specific components, devices, and features illustrated in the drawings and described herein are merely exemplary and should not be considered as limitations.

[0031] As shown Figures 1 - 12 in the figure, it is the first embodiment of the sheet mold. The sheet mold includes a mold core 10. The mold core 10 includes a base portion 114 and an extrusion portion 113. The first direction is defined as the direction perpendicular to the base portion 114. The extrusion portion 113 protrudes from the base portion 114. It should be noted that the protrusion here can be that the extrusion portion 113 protrudes in one direction relative to the base portion 114, or the extrusion portion 113 is recessed in one direction relative to the base portion 114, that is, the protrusion means that the extrusion portion 113 and the base portion 114 are at different heights along the first direction. The extrusion portion 113 includes at least one first extrusion area 1131. The extrusion portion 113 includes a second extrusion area 1132. Along the first direction, the maximum height between the first extrusion area 1131 and the base portion 114 is defined as D1, and the maximum height between the second extrusion area 1132 and the base portion 114 is defined as D2. D1 is greater than D2. The first extrusion area 1131 protrudes farther from the base portion 114 than the second extrusion portion 1122. The second direction is defined perpendicular to the first direction. Along the second direction, the second extrusion area 1132 is closer to the base portion 114 than the first extrusion area 1131. Along the first direction, there is at least one first extrusion area 1131, and the height of the first extrusion area 1131 is greater than the height of the second extrusion area 1132. When the mold core 10 extrudes the sheet 12, the sheet 12 at the first extrusion area 1131 has a greater degree of deformation and more material thinning. The sheet 12 formed at the second extrusion area 1132 has a smaller degree of deformation and less material thinning of the sheet 12. The material of the sheet 12 at the second extrusion area 1132 compensates for the material thinning of the sheet 12 at the first extrusion area 1131, thereby reducing the thinning degree of the sheet 12 at the first extrusion area 1131 and reducing the probability of the sheet 12 at the first extrusion area 1131 cracking due to thinning, and improving the qualification rate of the sheet 12 forming. And because the second extrusion area 1132 is closer to the base portion 114 than the first extrusion area 1131, the deformation of the sheet 12 at the first extrusion area 1131 is more difficult than the deformation of the sheet 12 at the second extrusion area 1132. As a result, the actual formed deformation height of the sheet 12 at the first extrusion area 1131 is lower than the protruding height of the first extrusion area 1131. Therefore, the height of the first extrusion area 1131 is greater than the height of the second extrusion area 1132, which can compensate for the deformation height error of the sheet 12 at the first extrusion area 1131, reduce the height difference between the sheet 12 at the first extrusion area 1131 and the second extrusion area 1132, increase the dimensional accuracy of the formed sheet 12, and further reduce the fitting gap between the extrusion portions 113 when multiple sheets 12 are fitted, and further increase the welding qualification rate of multiple sheets 12. In this embodiment, as Figure 3 and Figure 12As shown, the die core 10 includes a side portion 115. The extrusion portion 113 is concentrated at the center of the die core 10. The base portion 114 is located outside the extrusion portion 113 and is closer to the side portion 115 than the extrusion portion 113. In other embodiments, as Figure 13 shown, it is also possible that part of the base portion 114 is closer to the side portion 115 than the extrusion portion 113, and part of the base portion 114 is closer to the center of the die core 10 than the extrusion portion 113. It should be noted that the die core 10 described here includes two separable components, and the sheet 12 is formed between the two components. In other embodiments, the die core 10 can also be a single component, and the sheet 12 is processed and formed by a single component.

[0032] Furthermore, as Figure 4 shown, it is defined that α1 = D1 - D2, and the range of α1 is 0.03 mm to 0.1 mm, that is, there is a height compensation of 0.03 mm to 0.1 mm between the first extrusion zone 1131 and the second extrusion zone 1132. In this embodiment, the height dimension error formed by the sheet 12 at the first extrusion zone 1131 after compensation is a positive deviation, that is, the height of the sheet 12 at the first extrusion zone 1131 is greater than the designed value of the sheet 12 and approaches the upper tolerance of the designed value. As the die core 10 is used, the protruding extrusion portion 113 of the die core 10 relative to the base portion 114 will wear, and the degree of wear will increase with the increase of the use time. The height of the first extrusion zone 1131 relative to the base portion 114 gradually decreases, that is, the positive deviation value at the first extrusion zone 1131 will gradually decrease, and then develop into a negative deviation and the negative deviation value gradually increases and approaches the lower tolerance of the designed value, so that the size of the first extrusion zone 1131 of the die core 10 changes in the direction from positive deviation to negative deviation, increasing the service life of the die core 10. In other embodiments, it is also possible that the height dimension formed by the sheet 12 at the first extrusion zone 1131 after compensation is a negative deviation and approaches the designed value, improving the dimensional accuracy of the formed sheet 12.

[0033] Furthermore, as Figure 4As shown, the range of α1 is 0.04 mm to 0.09 mm. The maximum value of the height difference between the first extrusion zone 1131 and the second extrusion zone 1132 is set to 0.09 mm. Compared with the dimension setting of 0.1 mm, the maximum height compensation of the first extrusion zone 1131 relative to the second extrusion zone 1132 is reduced, thereby reducing the deformation amount of the plate 12 at the first extrusion zone 1131, and further reducing the probability of the plate 12 cracking at the first extrusion zone 1131, and improving the qualification rate of the forming of the plate 12. The maximum value of the height difference between the first extrusion zone 1131 and the second extrusion zone 1132 is set to 0.04 mm. Compared with the dimension setting of 0.03 mm, the minimum height compensation of the first extrusion zone 1131 relative to the second extrusion zone 1132 is increased, the height difference between the first extrusion zone 1131 and the second extrusion zone 1132 is increased, and the positive height deviation value formed by the plate 12 at the first extrusion zone 1131 is increased, thereby increasing the service life of the die core 10.

[0034] This article focuses on improving the structure of the die core 10 of the plate die, which will be described in detail below with reference to the accompanying drawings.

[0035] Example 1

[0036] Please refer to Figures 3 - 8 、 Figure 14 In the first embodiment shown in the figure, this embodiment specifically discloses that the die core 10 includes a first die core 111. The first die core 111 includes a first base portion 1111 and a first extrusion portion 1112. The first extrusion portion 1112 protrudes from the first base portion 1111. The first extrusion portion 1112 includes a first sub-turbulent flow area 11121 and a second sub-turbulent flow area 11122. The first sub-turbulent flow area 11121 includes a first top portion 11123, and the second sub-turbulent flow area 11122 includes a second top portion 11124. Along the first direction, the maximum distance between the first top portion 11123 and the first base portion 1111 is greater than the maximum distance between the second top portion 11124 and the first base portion 1111. The deformation of the plate 12 at the first top portion 11123 is greater than the deformation at the second top portion 11124. The second sub-turbulent flow area 11122 is closer to the first base portion 1111 than the first sub-turbulent flow area 11121. The plate 12 is more difficult to deform at the first sub-turbulent flow area 11121 than at the second sub-turbulent flow area 11122. The error of the plate 12 at the first sub-turbulent flow area 11121 is larger than the error of the plate 12 at the second sub-turbulent flow area 11122. By increasing the protruding distance of the first sub-turbulent flow area 11121 relative to the first base portion 1111, the height error of the plate 12 caused by the large deformation difficulty at the first sub-turbulent flow area 11121 is compensated, thereby reducing the height difference between the first sub-turbulent flow area 11121 and the second sub-turbulent flow area 11122 of the plate 12, and further increasing the dimensional accuracy of the formed plate 12.

[0037] AsFigure 3 , 9 - Figure 11 , Figure 15 As shown in Figure 15 , the mold core 10 includes a second mold core 112. The second mold core 112 includes a second base portion 1121 and a second extrusion portion 1122. The second extrusion portion 1122 is recessed in the second base portion 1121. The second extrusion portion 1122 includes a mating portion 1123. At least a part of the first top portion 11123 or the second top portion 11124 can abut against the mating portion 1123. The sheet 12 is formed between the first mold core 111 and the second mold core 112. The first mold core 111 and the second mold core 112 move relative to each other to extrude and form the sheet 12 placed between the first mold core 111 and the second mold core 112, and stop moving after moving until the first top portion 11123 abuts against the mating portion 1123 and / or the second top portion 11124 abuts against the mating portion 1123.

[0038] In this embodiment, as Figures 9 - 11 shown, the mating portion 1123 includes a first bottom portion 11223 and a second bottom portion 11224. The second extrusion portion 1122 includes a third sub-turbulent flow area 11221 and a fourth sub-turbulent flow area 11222. The first bottom portion 11223 is located in the third sub-turbulent flow area 11221. Along the first direction, the first top portion 11123 can abut against the first bottom portion 11223, and the distance between the first bottom portion 11223 and the second base portion 1121 is D3, and D3 is equal to D1. The second bottom portion 11224 is located in the fourth sub-turbulent flow area 11222. Along the first direction, the second top portion 11124 can abut against the second bottom portion 11224, and the distance between the second bottom portion 11224 and the second base portion 1121 is D4, and D4 = D2. Define the plane perpendicular to the first direction as the first plane. For the overlapping part of the positive projection of the first extrusion portion 1112 and the second extrusion portion 1122 on the first plane, the protruding distance of the first extrusion portion 1112 is the same as the recessed distance of the second extrusion portion 1122. In other embodiments, it is also possible that part of the first top portion 11123 abuts against the mating portion 1123, and / or part of the second top portion 11124 abuts against the mating portion 1123.

[0039] In this embodiment, as Figure 5 shown, before processing the sheet 12, the first mold core 111 is located above the sheet 12, and the second mold core 112 is located below the sheet 12. When processing the sheet 12, the second mold core 112 does not move, and the first mold core 111 moves towards the second mold core 112 to process the sheet 12. In other embodiments, it is also possible that the first mold core 111 is located below the sheet 12, and the second mold core 112 is located above the sheet 12. When processing the sheet 12, the first mold core 111 does not move, and the second mold core 112 moves towards the first mold core 111 to process the sheet 12. It should be noted that the above and below mentioned here refer to one side of the sheet 12 and the opposite side.

[0040] Example 2

[0041] Please refer to Figure 3 、 Figure 5 、 Figure 16The second embodiment shown schematically. In this embodiment, it is specifically disclosed that the mold core 10 includes a first mold core 111. The first mold core 111 includes a first base portion 1111 and a first extrusion portion 1112. The first extrusion portion 1112 protrudes from the first base portion 1111. The first extrusion portion 1112 includes a first side portion 11125. The mold core 10 includes a second mold core 112. The second mold core 112 includes a second base portion 1121 and a second extrusion portion 1122. The second extrusion portion 1122 is recessed in the second base portion 1121. The second extrusion portion 1122 includes a second side portion 11225. Along the first direction, the distance between the first side portion 11125 and the second side portion 11225 is defined as β1, and the distance between the first base portion 1111 and the second base portion 1121 is defined as β2. β1 is greater than β2. Since β1 is greater than β2, when the first mold core 111 and the second mold core 112 are closed, the first base portion 1111 and the second base portion 1121 are in contact. At this time, there is a gap between the first side portion 11125 and the second side portion 11225. When the first mold core 111 and the second mold core 112 extrude the sheet 12, both the first base portion 1111 and the second base portion 1121 are in contact with the surface of the sheet 12. Since β1 is greater than β2, the distance between the first side portion 11125 and the second side portion 11225 is greater than the thickness of the sheet 12. Therefore, at least one of the first side portion 11125 and the second side portion 11225 is not in contact with the surface of the sheet 12, and the first side portion 11125 and the second side portion 11225 do not play a role in pressing the sheet 12. At this time, when the first top portion 11123 extrudes the sheet 12 and causes the sheet 12 to deform, the first top portion 11123 moves along the first direction and stretches the sheet 12 around the first top portion 11123, causing the sheet 12 around the first top portion 11123 to become thinner. Along the first direction, since the first side portion 11125 and the second side portion 11225 do not press the sheet 12 around the first top portion 11123, the sheet 12 around the first top portion 11123 is more likely to deform and become thinner, and then the sheet 12 at the first top portion 11123 is more likely to move along the first direction, thereby reducing the dimensional error of the height of the sheet 12 at the first top portion 11123. At the same time, since the second top portion 11124 extrudes the sheet 12 and causes the sheet 12 to deform, when the sheet 12 deforms, the second top portion 11124 moves along the first direction and stretches the sheet 12 around the second top portion 11124, causing the sheet 12 around the second top portion 11124 to become thinner. Along the first direction, the first side portion 11125 and the second side portion 11225 do not press the sheet 12 around the second top portion 11124, making the sheet 12 around the second top portion 11124 more likely to deform and become thinner, and then the sheet 12 at the second top portion 11124 is more likely to move along the first direction, thereby reducing the dimensional error of the height of the sheet 12 at the second top portion 11124.And since it is not pressed by the first side portion 11125 and the second side portion 11225, the sheet 12 around the first top portion 11123 and the second top portion 11124 is not easily broken during deformation, reducing the probability of the sheet 12 breaking.

[0042] Furthermore, define α2 = β1 - β2. The range of α2 is 0.42 mm to 0.5 mm. α2 is the gap between the first side portion 11125 and the second side portion 11225 after the first die core 111 and the second die core 112 are closed. Further restricting the gap between the first side portion 11125 and the second side portion 11225 to be greater than 0.42 mm is beneficial to the thinning of the sheet 12 when the first top portion 11123 and the second top portion 11124 are deformed. In this embodiment, α2 is the gap between the first side portion 11125 and the second side portion 11225 along the first direction after the first die core 111 and the second die core 112 are closed. In other embodiments, α2 can also be the vertical distance between the first side portion 11125 and the second side portion 11225.

[0043] Furthermore, the range of α2 is 0.44 m to 0.49 mm, further increasing the gap between the first side portion 11125 and the second side portion 11225, which is beneficial to the thinning of the sheet 12 when the first top portion 11123 and the second top portion 11124 are deformed.

[0044] Embodiment Three

[0045] Please refer to Figure 1 、 Figure 2 、 Figures 17 - 20The third embodiment shown schematically. In this embodiment, a sheet mold is specifically disclosed, which includes a first die core 111 and a second die core 112. The first die core 111 includes a first base 1111, a first extrusion part 1112, and an avoidance part 1113. The first direction is defined as the direction perpendicular to the first base 1111. It should be noted that the first base 1111 here is the flat part between the first extrusion parts 1112 that does not protrude or recess in the first direction. Along the first direction, the distance between at least part of the first base 1111 and the second die core 112 is less than the distance between the avoidance part 1113 and the second die core 112. That is, when the first die core 111 and the second die core 112 extrude the sheet 12, when the first base 1111 is in contact with the surface of the sheet 12, along the first direction, the avoidance part 1113 is not in contact with the surface of the sheet 12. Furthermore, the avoidance part 1113 does not play a role in pressing the sheet 12. At this time, when the first extrusion part 1112 extrudes the sheet 12 to cause the sheet 12 to deform, the first extrusion part 1112 moves along the first direction and stretches the sheet 12 around the first extrusion part 1112, causing the sheet 12 around the first extrusion part 1112 to become thinner. Along the first direction, the avoidance part 1113 does not play a role in pressing the sheet 12, making it easier for the sheet 12 around the first extrusion part 1112 to deform and become thinner. Furthermore, it makes it easier for the sheet 12 at the first top 11123 to move along the first direction, and further reduces the dimensional error of the height of the sheet 12 at the first extrusion part 1112.

[0046] In this embodiment, as Figure 19 shown, the first extrusion part 1112 is recessed in the first base 1111. In other embodiments, it can also be as Figure 18 shown, the first extrusion part 1112 protrudes from the first base 1111.

[0047] In this embodiment, along the first direction, the distance between at least part of the first base 1111 and the second die core 112 is less than the distance between the avoidance part 1113 and the second die core 112. In other embodiments, it can also be that the distance between at least part of the first extrusion part 1112 and the second die core 112 is less than the distance between the avoidance part 1113 and the second die core 112.

[0048] It should be noted that: The above has introduced the sheet mold provided by the present application in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the core idea of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and modifications can still be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A sheet die, characterized in that, It includes a mold core (10), the mold core (10) includes a base (114) and an extrusion part (113), a first direction is defined perpendicular to the base (114), the extrusion part (113) at least includes a first extrusion area (1131), the extrusion part (113) includes a second extrusion area (1132), along the first direction, the maximum distance between the first extrusion area (1131) and the base (114) is defined as D1, the maximum distance between the second extrusion area (1132) and the base (114) is defined as D2, D1 is greater than D2, a second direction is defined perpendicular to the first direction, along the second direction, the second extrusion area (1132) is closer to the base (114) than the first extrusion area (1131).

2. The sheet mold according to claim 1, characterized in that, Define α1 = D1 - D2, and the range of α1 is 0.03 mm to 0.1 mm.

3. The plate die according to claim 2, wherein The range of α1 is 0.04 mm to 0.09 mm.

4. The sheet mold according to any one of claims 1-3, characterized in that, The mold core (10) includes a first mold core (111), the first mold core (111) includes a first base (1111) and a first extrusion part (1112), the first extrusion part (1112) protrudes from the first base (1111), the first extrusion part (1112) includes a first sub-turbulence area (11121) and a second sub-turbulence area (11122), the first sub-turbulence area (11121) includes a first top (11123), the second sub-turbulence area (11122) includes a second top (11124), along the first direction, the maximum distance between the first top (11123) and the first base (1111) is greater than the maximum distance between the second top (11124) and the first base (1111), along the second direction, the second sub-turbulence area (11122) is closer to the first base (1111) than the first sub-turbulence area (11121).

5. The plate mold according to claim 4, characterized in that, It includes a second mold core (112), the second mold core (112) includes a second base (1121) and a second extrusion part (1122), the second extrusion part (1122) is recessed in the second base (1121), the second extrusion part (1122) includes a mating part (1123), along the first direction, at least part of the first top (11123) or the second top (11124) can abut against the mating part (1123).

6. The sheet mold according to claim 5, characterized in that, The mating part (1123) includes a first bottom (11223) and a second bottom (11224). The second extrusion part (1122) includes a third sub-turbulent flow area (11221) and a fourth sub-turbulent flow area (11222). The first bottom (11223) is located in the third sub-turbulent flow area (11221). Along the first direction, the first top (11123) and the first bottom (11223) can be in contact with each other, and the distance between the first bottom (11223) and the second base (1121) is D3, and D3 is equal to D1. The second bottom (11224) is located in the fourth sub-turbulent flow area (11222). Along the first direction, the second top (11124) and the second bottom (11224) can be in contact with each other, and the distance between the second bottom (11224) and the second base (1121) is D4, and D4 = D2.

7. The slab die according to claim 5 or 6, characterized in that, The first extrusion part (1112) includes a first side part (11125), and the second extrusion part (1122) includes a second side part (11225). Along the first direction, the distance between the first side part (11125) and the second side part (11225) is defined as β1, and the distance between the first base (1111) and the second base (1121) is β2, and β1 is greater than β2.

8. The plate die according to claim 7, wherein Define α2 = β1 - β2, and the range of α2 is 0.42 mm to 0.5 mm.

9. The plate die according to claim 8, characterized in that, The range of α2 is 0.44 m to 0.49 mm.

10. A sheet die, characterized in that, It includes a first die core (111) and a second die core (112). The first die core (111) includes a first base (1111), a first extrusion part (1112), and an avoidance part (1113). The first extrusion part (1112) is recessed or protruded from the first base (1111). Define the first direction perpendicular to the first base (1111). Along the first direction, the distance between at least part of the first base (1111) and the second die core (112) is less than the distance between the avoidance part (1113) and the second die core (112), and / or the distance between at least part of the first extrusion part (1112) and the second die core (112) is less than the distance between the avoidance part (1113) and the second die core (112).

11. The plate die according to claim 10, wherein, The first extrusion part (1112) is recessed from the first base (1111). The second die core (112) includes a second extrusion part (1122) and a second base (1121). The second extrusion part (1122) protrudes from the second base (1121). The first extrusion part (1112) is in contact with the second extrusion part (1122), and / or the first base (1111) is in contact with the second base (1121).

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