Waisted middle hub sand core structure and its forming die

Abstract

This utility model discloses a waist-shaped intermediate hub sand core structure and its molding die, belonging to the field of sand core technology. It includes a first arc-shaped boss, a second arc-shaped boss integrally formed at the bottom of the first arc-shaped boss, a third arc-shaped boss above the first arc-shaped boss, a positioning component connecting the first and third arc-shaped bosses, a fourth arc-shaped boss integrally formed at the top of the third arc-shaped boss, and a fifth arc-shaped boss integrally formed at the top of the fourth arc-shaped boss. The first, second, third, fourth, and fifth arc-shaped bosses are integrally formed with straight holes, and the top dimensions of the first, fourth, and fifth arc-shaped bosses are smaller than their bottom dimensions, while the top dimensions of the second and third arc-shaped bosses are larger than their bottom dimensions. This utility model generates an assembled waist-shaped sand core structure, which is then applicable to waist-shaped intermediate hub structures.

Description

Technical Field

[0001] This utility model relates to the field of sand core technology, specifically to a waist-shaped intermediate hub sand core structure and its molding die. Background Technology

[0002] Motorcycle wheel designs are becoming increasingly diverse, especially hollow structures. To meet the demands for aesthetic appeal and lightweight design, more and more products feature a tapered waist, resulting in a slimmer appearance and practicality. However, conventional sand core molds, with their top and bottom demolding structures, make it difficult to achieve a concave waist in the sand core design. This requires significant structural modifications to the machine, such as adding side molds for the sand core, but these modifications are too drastic and severely limit the machine's capabilities.

[0003] Based on this, the present invention designs a waist-shaped intermediate hub sand core structure and its molding die. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the existing technology, this utility model provides a waist-shaped intermediate hub sand core structure and its molding die.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] The waist-shaped intermediate hub sand core structure includes a first arc-shaped boss, a second arc-shaped boss integrally formed at the bottom of the first arc-shaped boss, a third arc-shaped boss above the first arc-shaped boss, a positioning component connecting the first and third arc-shaped bosses, a fourth arc-shaped boss integrally formed at the top of the third arc-shaped boss, and a fifth arc-shaped boss integrally formed at the top of the fourth arc-shaped boss. The first, second, third, fourth, and fifth arc-shaped bosses are integrally formed with straight holes, and the top dimensions of the first, fourth, and fifth arc-shaped bosses are smaller than their bottom dimensions, while the top dimensions of the second and third arc-shaped bosses are larger than their bottom dimensions. The first and third arc-shaped bosses are each provided with a reinforcing support component for reinforcement.

[0007] Furthermore, the positioning component includes a plug, which is integrally formed at equal intervals along the circumference at the bottom of the second arc-shaped boss, and the top of the first arc-shaped boss has an insertion hole integrally formed along the circumference to mate with the plug.

[0008] Furthermore, the reinforcement support assembly is provided in two groups, upper and lower. The upper group of reinforcement support assemblies is located inside the third, fourth, and fifth arc-shaped bosses, while the lower group of reinforcement support assemblies is located inside the first and second arc-shaped bosses.

[0009] Furthermore, the reinforcement support component includes annular reinforcing ribs and straight supporting ribs. The annular reinforcing ribs are fixedly installed at equal intervals on the outer wall of the straight supporting ribs, and the straight supporting ribs are arranged at equal intervals along the circumference inside the annular reinforcing ribs. The annular reinforcing ribs and straight supporting ribs are embedded in the first arc-shaped boss, the second arc-shaped boss, the third arc-shaped boss, the fourth arc-shaped boss, and the fifth arc-shaped boss.

[0010] A set of molding dies for forming a waist-shaped intermediate hub sand core structure includes a first die and a second die. The first die is used for forming a first arc-shaped boss, a second arc-shaped boss, a straight hole, and an insertion hole. The second die is used for forming a third arc-shaped boss, a fourth arc-shaped boss, a fifth arc-shaped boss, and an insertion block. The bottom of both the first die and the second die is connected to a positioning support for reinforcing support components and a pushing component for forming and ejecting.

[0011] Furthermore, the first mold includes a first upper mold, a first column, a first lower mold, a first arc-shaped boss forming groove, a sliding hole, and an insertion hole forming protrusion. The top of the first lower mold has a first arc-shaped boss forming groove for forming the second arc-shaped boss. The bottom of the first arc-shaped boss forming groove is fixedly connected to a first column for forming straight holes in the first arc-shaped boss and the second arc-shaped boss. The bottom of the first upper mold has a sliding hole for forming the first arc-shaped boss. The top of the sliding hole is fixedly connected to insertion hole forming protrusions at equal intervals along the circumference. The first lower mold is connected to the pushing assembly, and the first upper mold is located directly above the first lower mold.

[0012] Furthermore, the second mold includes a second upper mold, a second column, a second lower mold, a fifth arc-shaped boss forming groove, a fourth arc-shaped boss forming groove, a third arc-shaped boss forming groove, and an insert forming groove. The top of the second lower mold has a fourth arc-shaped boss forming groove for forming the fourth arc-shaped boss. The bottom of the second lower mold has a third arc-shaped boss forming groove for forming the third arc-shaped boss. The bottom of the third arc-shaped boss forming groove is fixedly connected to the second column formed by the straight holes in the third arc-shaped boss, the fourth arc-shaped boss, and the fifth arc-shaped boss. The bottom of the third arc-shaped boss forming groove has insert forming grooves for forming inserts at equal intervals along the circumference. The second upper mold is located directly above the second lower mold. The bottom of the second upper mold has a fifth arc-shaped boss forming groove for forming the fifth arc-shaped boss. The second lower mold is connected to the pushing assembly.

[0013] Furthermore, the pushing component includes a lifting component and an inward pushing component. The pushing component is movably connected to the second lower mold or the first lower mold, and the inward pushing component is connected to the pushing component.

[0014] Beneficial effects

[0015] The top dimensions of the first, fourth, and fifth arc-shaped bosses of this invention are smaller than their bottom dimensions, while the top dimensions of the second and third arc-shaped bosses are larger than their bottom dimensions. The first, second, third, fourth, and fifth arc-shaped bosses are formed into a waist-shaped intermediate hub sand core structure. Then, the positioning component facilitates the positioning and connection of the first and third arc-shaped bosses, realizing the splicing of the sand core and generating an assembled waist-shaped sand core structure, which is then suitable for a waist-shaped intermediate hub structure. In addition, the reinforcement support component helps to support the waist-shaped intermediate hub structure, ensuring stability during transportation and use. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 The three-dimensional main structure of the waist-shaped intermediate hub sand core structure of this utility model. Figure 1 ;

[0018] Figure 2 This is a front view of the waist-shaped intermediate hub sand core structure of this utility model;

[0019] Figure 3 For along Figure 2 A sectional view along the AA direction;

[0020] Figure 4 This is a three-dimensional view of the first mold;

[0021] Figure 5 This is a front view of the first mold;

[0022] Figure 6 For along Figure 5 BB direction section view

[0023] Figure 7 This is a 3D view of the second mold;

[0024] Figure 8 This is a front view of the second mold;

[0025] Figure 9 For along Figure 8 A cross-sectional view along the CC direction;

[0026] Figure 10 This is a structural diagram of the second lower mold.

[0027] The labels in the diagram represent:

[0028] 1. First arc-shaped boss 2. Second arc-shaped boss 3. Third arc-shaped boss 4. Fourth arc-shaped boss 5. Fifth arc-shaped boss 6. Straight hole 7. Annular reinforcing rib 8. Supporting straight rib 9. Insert block 10. Insert hole 11. First upper mold 12. First column 13. First lower mold 14. Pushing outer rod 15. First connecting plate 16. Support cylinder 17. Second connecting plate 18. First hydraulic cylinder 19. Second hydraulic cylinder 20. Third connecting plate 21. Push tube 22. First arc-shaped boss forming groove 23. Second arc-shaped boss forming groove 24. Sliding hole 25. Insert hole forming protrusion 26. Second upper mold 27. Second column 28. Second lower mold 29. Fifth arc-shaped boss forming groove 30. Fourth arc-shaped boss forming groove 31. Third arc-shaped boss forming groove 32. Insert block forming groove. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0030] The present invention will be further described below with reference to the embodiments.

[0031] Example 1: Please refer to the appendix of the instruction manual. Figure 1-3 The waist-shaped intermediate hub sand core structure includes a first arc-shaped boss 1, a second arc-shaped boss 2 integrally formed at the bottom of the first arc-shaped boss 1, a third arc-shaped boss 3 above the first arc-shaped boss 1, a positioning component connecting the first arc-shaped boss 1 and the third arc-shaped boss 3, a fourth arc-shaped boss 4 integrally formed at the top of the third arc-shaped boss 3, and a fifth arc-shaped boss 5 integrally formed at the top of the fourth arc-shaped boss 4. The first arc-shaped boss 1, the second arc-shaped boss 2, the third arc-shaped boss 3, the fourth arc-shaped boss 4 and the fifth arc-shaped boss 5 are integrally formed with straight holes 6, and the top dimensions of the first arc-shaped boss 1, the fourth arc-shaped boss 4 and the fifth arc-shaped boss 5 are smaller than their bottom dimensions, while the top dimensions of the second arc-shaped boss 2 and the third arc-shaped boss 3 are larger than their bottom dimensions. The first arc-shaped boss 1 and the third arc-shaped boss 3 are each provided with a reinforcing support component for reinforcement.

[0032] The top dimensions of the first arc-shaped boss 1, the fourth arc-shaped boss 4, and the fifth arc-shaped boss 5 are smaller than their bottom dimensions, while the top dimensions of the second arc-shaped boss 2 and the third arc-shaped boss 3 are larger than their bottom dimensions. The first arc-shaped boss 1, the second arc-shaped boss 2, the third arc-shaped boss 3, the fourth arc-shaped boss 4, and the fifth arc-shaped boss 5 are formed into a waist-shaped intermediate hub sand core structure. Then, the positioning component facilitates the positioning and connection of the first arc-shaped boss 1 and the third arc-shaped boss 3, realizing the splicing of the sand core and generating an assembled waist-shaped sand core structure, which is then suitable for the waist-shaped intermediate hub structure. In addition, the reinforcement support component helps to support the waist-shaped intermediate hub structure, ensuring stability during transportation and use.

[0033] The positioning component includes a plug 9, which is integrally formed at equal intervals along the circumference at the bottom of the second arc-shaped boss 2. The top of the first arc-shaped boss 1 is integrally formed with a socket 10 that mates with the plug 9 along the circumference.

[0034] The insertion block 9 and insertion hole 10 of the positioning component cooperate to facilitate the positioning and connection of the first arc-shaped boss 1 and the third arc-shaped boss 3, realize the splicing of the sand core, generate the assembled waist-shaped sand core structure, and then apply the waist-shaped intermediate hub structure.

[0035] The reinforcement support assembly is provided in two groups, upper and lower. The upper group of reinforcement support assemblies is located in the third arc-shaped boss 3, the fourth arc-shaped boss 4 and the fifth arc-shaped boss 5, and the lower group of reinforcement support assemblies is located in the first arc-shaped boss 1 and the second arc-shaped boss 2.

[0036] The reinforcement support assembly includes annular reinforcing ribs 7 and supporting straight ribs 8. The annular reinforcing ribs 7 are fixedly installed at equal intervals on the outer wall of the supporting straight ribs 8, and the supporting straight ribs 8 are arranged at equal intervals along the circumference within the annular reinforcing ribs 7. The annular reinforcing ribs 7 and the supporting straight ribs 8 are embedded in the first arc-shaped boss 1, the second arc-shaped boss 2, the third arc-shaped boss 3, the fourth arc-shaped boss 4, and the fifth arc-shaped boss 5.

[0037] The ring-shaped reinforcing rib 7 and the straight supporting rib 8 of the reinforcement support assembly work together to help support the waist-shaped intermediate hub structure, ensuring stability during transportation and use.

[0038] Example 2: Please refer to the appendix of the instruction manual. Figure 4-10 A set of molding dies for forming a waist-shaped intermediate hub sand core structure includes a first die and a second die. The first die is used for forming a first arc-shaped boss 1, a second arc-shaped boss 2, a straight hole 6 and an insertion hole 10. The second die is used for forming a third arc-shaped boss 3, a fourth arc-shaped boss 4, a fifth arc-shaped boss 5 and an insertion block 9. The bottom of both the first die and the second die is connected to a positioning support for reinforcing support components and a pushing component for forming and ejecting.

[0039] The first mold facilitates the forming of the first arc-shaped boss 1, the second arc-shaped boss 2, the straight hole 6, and the insertion hole 10. The second mold facilitates the forming of the third arc-shaped boss 3, the fourth arc-shaped boss 4, the fifth arc-shaped boss 5, and the insertion block 9. The pushing component facilitates the reinforcement and positioning of the support component, as well as the lifting and discharge of the waist-shaped sand core structure.

[0040] The first mold includes a first upper mold 11, a first column 12, a first lower mold 13, a first arc-shaped boss forming groove 22, a sliding hole 24, and a hole forming protrusion 25. The top of the first lower mold 13 is provided with a first arc-shaped boss forming groove 22 for forming the second arc-shaped boss 2. The bottom of the first arc-shaped boss forming groove 22 is fixedly connected with a first column 12 for forming the straight holes 6 in the first arc-shaped boss 1 and the second arc-shaped boss 2. The bottom of the first upper mold 11 is provided with a sliding hole 24 for forming the first arc-shaped boss 1. The top of the sliding hole 24 is fixedly connected with hole forming protrusions 25 at equal intervals along the circumference. The first lower mold 13 is connected to the pushing assembly, and the first upper mold 11 is located directly above the first lower mold 13.

[0041] After the first upper mold 11 and the first lower mold 13 are closed, molding sand is added into the first arc-shaped boss forming groove 22 and the sliding hole 24. The first arc-shaped boss forming groove 22, the first column 12 and the sliding hole 24 form the first arc-shaped boss 1, the second arc-shaped boss 2 and the straight hole 6. The insertion hole forming protrusion 25 forms the insertion hole 10.

[0042] The second mold includes a second upper mold 26, a second column 27, a second lower mold 28, a fifth arc-shaped boss forming groove 29, a fourth arc-shaped boss forming groove 30, a third arc-shaped boss forming groove 31, and an insert forming groove 32. The second lower mold 28 has a fourth arc-shaped boss forming groove 30 at its top for forming the fourth arc-shaped boss 4, and a third arc-shaped boss forming groove 31 at the bottom of the fourth arc-shaped boss forming groove 30 for forming the third arc-shaped boss 3. The bottom of the forming groove 31 is fixedly connected to the second column 27 formed by the straight holes 6 in the third arc-shaped boss 3, the fourth arc-shaped boss 4 and the fifth arc-shaped boss 5. The bottom of the third arc-shaped boss forming groove 31 is provided with insert forming grooves 32 for forming insert blocks 9 at equal intervals along the circumference. The second upper mold 26 is located directly above the second lower mold 28. The bottom of the second upper mold 26 is provided with a fifth arc-shaped boss forming groove 29 for forming the fifth arc-shaped boss 5. The second lower mold 28 is connected to the pushing assembly.

[0043] The second upper mold 26 and the second lower mold 28 are combined, and molding sand is added into the fifth arc-shaped boss forming groove 29, the fourth arc-shaped boss forming groove 30, the third arc-shaped boss forming groove 31 and the insert forming groove 32. The third arc-shaped boss 3, the fourth arc-shaped boss 4 and the fifth arc-shaped boss 5, the straight hole 6 and the insert 9 are formed in the fifth arc-shaped boss forming groove 29, the fourth arc-shaped boss forming groove 30, the third arc-shaped boss forming groove 31 and the insert forming groove 32.

[0044] The second lower mold 28 and the first lower mold 13 are fixedly installed on the frame. The first upper mold 11 and the second upper mold 26 are both fixedly installed on the vertical position adjustment device on the frame. The top of the fifth arc-shaped boss forming groove 29 and the top of the sliding hole 24 are both provided with sand guide holes that can be inserted into the output end of the sand-shooting machine.

[0045] The pushing component includes a lifting component and an inward pushing component. The pushing component is movably connected to the second lower mold 28 or the first lower mold 13, and the inward pushing component is connected to the pushing component.

[0046] The lifting assembly includes a pushing outer rod 14, a first connecting plate 15, a support cylinder 16, a second connecting plate 17, and a first hydraulic cylinder 18. The driving end of the first hydraulic cylinder 18 is fixedly connected to the bottom of the second connecting plate 17. Both ends of the second connecting plate 17 are fixedly connected to the bottom of the support cylinder 16, and the top of the support cylinder 16 is fixedly connected to both ends of the support cylinder 16. The pushing outer rod 14 is installed at equal intervals along the circumference on the top of the first connecting plate 15. Both the second lower mold 28 and the first lower mold 13 are provided with a second arc-shaped boss forming groove 23, and the pushing outer rod 14 is in close sliding connection with the second arc-shaped boss forming groove 23.

[0047] The internal push assembly includes a second hydraulic cylinder 19, a third connecting plate 20, and a push tube 21. The second hydraulic cylinder 19 is fixedly installed on the top of the second connecting plate 17, the third connecting plate 20 is fixedly installed on the drive end of the second hydraulic cylinder 19, and the push tube 21 is fixedly installed on the third connecting plate 20 at equal intervals along the circumference. The push tube 21 is in close contact with the inner wall of the push rod 14 and is slidably connected. The support rib 8 is in close contact with the inner wall of the push tube 21.

[0048] During the installation of the annular reinforcing rib 7 and the supporting straight rib 8, the second hydraulic cylinder 19 of the inner push assembly drives the third connecting plate 20 to move downwards, the third connecting plate 20 drives the push tube 21 to move downwards, and the top of the push tube 21 moves below the top of the pushing outer rod 14. The first hydraulic cylinder 18 drives the second connecting plate 17 to move, the second connecting plate 17 drives the support cylinder 16 to move, the support cylinder 16 drives the first connecting plate 15 to move, and the first connecting plate 15 drives the pushing outer rod 14 to move until the top of the pushing outer rod 14 is flush with the bottom of the first arc-shaped boss forming groove 22 or the bottom of the third arc-shaped boss forming groove 31. Then, the supporting straight rib 8 is inserted into the top of the pushing outer rod 14, and the first arc-shaped boss... After sand is injected into the forming groove 22 or the third arc-shaped boss forming groove 31, the second hydraulic cylinder 19 drives the third connecting plate 20 to move upward, the third connecting plate 20 drives the push tube 21 to move upward, the push tube 21 moves upward until it is flush with the top of the push rod 14, and then sand is added again to avoid the positional displacement of the annular reinforcing rib 7 and the supporting straight rib 8 when sand is added at the beginning. After forming, the first hydraulic cylinder 18 drives the second connecting plate 17 to move upward, the second connecting plate 17 drives the supporting cylinder 16 to move, the supporting cylinder 16 drives the first connecting plate 15 to move, the first connecting plate 15 drives the push rod 14 to move, and the push rod 14 pushes the formed part upward to facilitate the ejection of the formed part.

[0049] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A tapered intermediate hub core structure comprising a first arcuate boss (1), characterized in that, The bottom of the first arc-shaped boss (1) is integrally formed with a second arc-shaped boss (2), and a third arc-shaped boss (3) is provided above the first arc-shaped boss (1). A positioning component is connected between the first arc-shaped boss (1) and the third arc-shaped boss (3). The top of the third arc-shaped boss (3) is integrally formed with a fourth arc-shaped boss (4), and the top of the fourth arc-shaped boss (4) is integrally formed with a fifth arc-shaped boss (5). The first arc-shaped boss (1), the second arc-shaped boss (2), the third arc-shaped boss (3), the fourth arc-shaped boss (4), and the fifth arc-shaped boss (5) are integrally formed with a straight hole (6). The top dimensions of the first arc-shaped boss (1), the fourth arc-shaped boss (4), and the fifth arc-shaped boss (5) are smaller than their bottom dimensions. The top dimensions of the second arc-shaped boss (2) and the third arc-shaped boss (3) are larger than their bottom dimensions. The first arc-shaped boss (1) and the third arc-shaped boss (3) are both provided with a reinforcing support component for reinforcing support.

2. The tapered intermediate hub core structure of claim 1 wherein, The positioning component includes a plug (9), which is integrally formed at equal intervals along the circumference at the bottom of the second arc-shaped boss (2), and the top of the first arc-shaped boss (1) is integrally formed with a socket (10) that mates with the plug (9) along the circumference.

3. The tapered intermediate hub core structure of claim 2 wherein, The reinforcement support assembly is provided in two groups, upper and lower. The upper group of reinforcement support assemblies is located in the third arc-shaped boss (3), the fourth arc-shaped boss (4) and the fifth arc-shaped boss (5), while the lower group of reinforcement support assemblies is located in the first arc-shaped boss (1) and the second arc-shaped boss (2).

4. The tapered intermediate hub core structure of claim 3 wherein, The reinforcement support assembly includes annular reinforcing ribs (7) and support straight ribs (8). The annular reinforcing ribs (7) are fixedly installed at equal intervals on the outer wall of the support straight ribs (8), and the support straight ribs (8) are arranged at equal intervals along the circumference inside the annular reinforcing ribs (7). The annular reinforcing ribs (7) and support straight ribs (8) are embedded in the first arc-shaped boss (1), the second arc-shaped boss (2), the third arc-shaped boss (3), the fourth arc-shaped boss (4), and the fifth arc-shaped boss (5).

5. A forming mold for forming the tapered intermediate hub core structure of claim 4, comprising a first mold and a second mold, wherein, The first mold is used for forming the first arc-shaped boss (1), the second arc-shaped boss (2), the straight hole (6) and the insertion hole (10); the second mold is used for forming the third arc-shaped boss (3), the fourth arc-shaped boss (4), the fifth arc-shaped boss (5) and the insertion block (9). The bottom of both the first mold and the second mold is connected to a positioning support for reinforcing the support components and a pushing component for forming and ejecting.

6. The molding die according to claim 5, characterized in that, The first mold includes a first upper mold (11), a first column (12), a first lower mold (13), a first arc-shaped boss forming groove (22), a sliding hole (24), and a socket forming protrusion (25). The top of the first lower mold (13) is provided with a first arc-shaped boss forming groove (22) for forming the second arc-shaped boss (2). The bottom of the first arc-shaped boss forming groove (22) is fixedly connected with a first column (12) for forming the straight hole (6) in the first arc-shaped boss (1) and the second arc-shaped boss (2). The bottom of the first upper mold (11) is provided with a sliding hole (24) for forming the first arc-shaped boss (1). The top of the sliding hole (24) is fixedly connected with a socket forming protrusion (25) at equal intervals along the circumference. The first lower mold (13) is connected to the pushing assembly. The first upper mold (11) is located directly above the first lower mold (13).

7. The molding die according to claim 5, characterized in that, The second mold includes a second upper mold (26), a second column (27), a second lower mold (28), a fifth arc-shaped boss forming groove (29), a fourth arc-shaped boss forming groove (30), a third arc-shaped boss forming groove (31), and an insert forming groove (32). The second lower mold (28) has a fourth arc-shaped boss forming groove (30) at the top for forming the fourth arc-shaped boss (4), and a third arc-shaped boss forming groove (31) at the bottom of the fourth arc-shaped boss forming groove (30) for forming the third arc-shaped boss (3). The bottom of the groove (31) is fixedly connected to the second column (27) formed by the straight hole (6) in the third arc-shaped boss (3), the fourth arc-shaped boss (4) and the fifth arc-shaped boss (5). The bottom of the third arc-shaped boss forming groove (31) is provided with a block forming groove (32) for forming the block (9) at equal intervals along the circumference. The second upper mold (26) is located directly above the second lower mold (28). The bottom of the second upper mold (26) is provided with a fifth arc-shaped boss forming groove (29) for forming the fifth arc-shaped boss (5). The second lower mold (28) is connected to the pushing assembly.

8. The molding die according to claim 6 or 7, characterized in that, The pushing component includes a lifting component and an inward pushing component. The pushing component is movably connected to the second lower mold (28) or the first lower mold (13), and the inward pushing component is connected to the pushing component.

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