CN115179514A

CN115179514A - Injection molding's wheel hub and forming die thereof

Info

Publication number: CN115179514A
Application number: CN202211098677.4A
Authority: CN
Inventors: 唐明辉
Original assignee: Ningbo Baiyi Automotive Parts Co ltd
Current assignee: Ningbo Xuanyuan Yihe Automotive Parts Co.,Ltd.
Priority date: 2022-09-09
Filing date: 2022-09-09
Publication date: 2022-10-14
Anticipated expiration: 2042-09-09
Also published as: CN115179514B

Abstract

The application discloses an injection molded wheel hub and a molding die thereof, wherein the wheel hub is suitable for injection molding by adding carbon fiber particles into thermoplastic plastics; the forming die comprises a fixed die component and a movable die component, wherein a cavity is formed between the fixed die component and the movable die component, and the forming die is characterized in that: a cooling device is arranged in the movable die assembly, the cooling device is suitable for extending into the cavity, and the cooling device is suitable for placing the framework insert and communicated with the cooling channel; before injection molding, the framework insert is suitable for being fixedly placed on the cooling device and is positioned in the cavity; after injection molding, the hub is adapted to disengage from the cavity and allow the skeleton insert to be separated from the cooling device. Its advantages are high strength, light weight and low cost.

Description

Injection molding's wheel hub and forming die thereof

Technical Field

The application relates to the field of automobile parts, in particular to a wheel hub and forming equipment thereof.

Background

The conventional automobile hub mainly comprises two main types, namely a common metal hub, a cast iron hub and an aluminum alloy hub, and is widely applied to various types of automobiles, and the other type is a lighter composite material hub, such as a carbon fiber hub, and is mainly applied to high-end sports cars and other performance vehicles with high requirements on the quality and strength of the hub. However, the composite hub in the existing market has high price of raw materials and relatively complex manufacturing process, so the selling price is high.

How to improve the composite hub and the manufacturing process thereof to overcome the above problems is a problem to be solved by those skilled in the art.

Disclosure of Invention

An object of the present application is to provide an injection molded wheel hub that is high in strength, light in weight, and low in cost.

Another object of the present application is to provide a molding die for molding the hub, which has high cooling efficiency.

In order to achieve the above purposes, the technical scheme adopted by the application is as follows: an injection moulded wheel hub, said wheel hub being adapted to be injection moulded by thermoplastic with addition of carbon fibre granules.

Further, by weight, 100 parts of thermoplastic plastics and 20 to 200 parts of carbon fiber particles; the thermoplastic comprises polypropylene.

Further, the hub comprises an inner ring, an outer ring and spokes, wherein a skeleton insert is embedded in the inner ring, and a cooling channel is formed in the skeleton insert; the cooling channel is suitable for introducing a cooling medium during injection molding.

A forming die for forming the hub comprises a fixed die assembly and a movable die assembly, wherein a cavity is formed between the fixed die assembly and the movable die assembly, a cooling device is arranged in the movable die assembly and is suitable for extending into the cavity, and the cooling device is suitable for placing the framework insert and communicated with the cooling channel;

before injection molding, the framework insert is suitable for being fixedly placed on the cooling device and is positioned in the cavity; during injection molding, the thermoplastic plastics added with the carbon fiber particles are suitable for entering the cavity and coating the skeleton insert to form the hub, and meanwhile, a cooling medium is suitable for entering the cooling channel from the cooling device; after injection molding, the hub is adapted to disengage from the cavity and allow the skeleton insert to be separated from the cooling device.

Furthermore, the skeleton insert is of an annular structure, a central shaft hole is formed in the middle of the skeleton insert, a water inlet hole and a water outlet hole are formed in the inner wall of the skeleton insert, two sides of the water inlet hole and the two sides of the water outlet hole are respectively communicated with the cooling channel and the central shaft hole, the cooling device comprises a central cylinder, the central cylinder is suitable for penetrating through the central shaft hole, a water inlet channel and a water outlet channel are formed in the central cylinder, and the water inlet channel and the water outlet channel respectively extend to the side wall of the central cylinder; when the framework insert is fixedly placed on the cooling device, the water inlet channel is suitable for being communicated with the water inlet hole, and the water outlet channel is suitable for being communicated with the water outlet hole.

Further, an air inlet hole and an air outlet hole are formed in the inner wall of the framework insert, two sides of the air inlet hole and the two sides of the air outlet hole are respectively communicated with the cooling channel and the central shaft hole, an air inlet channel and an air outlet channel are further formed in the central cylinder, and the air inlet channel and the air outlet channel respectively extend to the side wall of the central cylinder; when the framework insert is fixedly placed on the cooling device, the air inlet channel is suitable for being communicated with the air inlet hole, and the air outlet channel is suitable for being communicated with the air outlet hole.

Furthermore, a plurality of wear-resistant sleeves are arranged on the framework insert and are suitable for forming bolt channels on the inner ring; the periphery of the central column body is further provided with an installation disc, a plurality of positioning columns extend out of the installation disc, and the positioning columns are suitable for being tightly attached to and penetrate through the wear-resistant sleeve.

Furthermore, the framework insert comprises a base and an upper cover, the cooling channel is formed on the base, and the upper cover is hermetically fixed on the base; the base is also provided with a plurality of supporting lugs, and the upper cover is suitable for abutting against the supporting lugs; the upper cover is provided with a fool-proof mark.

Furthermore, nozzles are arranged on the water inlet channel and the water outlet channel; when the framework insert is fixedly placed on the cooling device, the nozzle is suitable for being hermetically embedded into the water outlet hole or the water inlet hole;

the central cylinder is suitable for tightly penetrating through the central shaft hole; the nozzle comprises a sliding pipe, a spring and a limiting ring, the sliding pipe slides and is arranged in the water inlet channel or the water outlet channel in a clinging mode, the limiting ring is fixedly arranged in the water inlet channel or the water outlet channel, the spring is arranged between the sliding pipe and the limiting ring and is suitable for forcing the sliding pipe to slide outwards, and a guide inclined plane is arranged on the outer side face of the sliding pipe; the framework insert is placed in the cooling device, the lower edge of the framework insert is suitable for abutting against the guide inclined plane and pushing the sliding pipe to slide inwards, and after the framework insert is placed in place, the spring is suitable for pushing the sliding pipe to slide outwards and enter the water outlet hole or the water inlet hole.

Furthermore, the central cylinder is suitable for tightly adhering to and penetrating through the central shaft hole, a convex edge is arranged on the peripheral side of the central cylinder, and the framework insert is suitable for being placed in a mode of abutting against the convex edge;

the water inlet holes and the water outlet holes are respectively provided with a plurality of water inlet holes and a plurality of water outlet holes which are uniformly and alternately distributed along the circumferential direction; the framework insert is fixedly placed on the cooling device along the vertical direction, the water inlet hole is formed in the upper end of the cooling channel, and the water outlet hole is formed in the lower end of the cooling channel.

Compared with the prior art, the beneficial effect of this application lies in: the wheel hub is made of the composite material (thermoplastic plastics are added with carbon fiber particles), and has the advantage of high strength; compared with a hub taking carbon fibers as a main body, the hub has the advantages that the weight is reduced by about 30-40%; and meanwhile, the material cost is lower. In addition, the wheel hub of the scheme is subjected to injection molding, is simpler in process, has higher molding precision, can mold a more complex wheel hub structure, can avoid stress concentration and has higher molding quality.

According to the scheme, the cooling device is arranged on the forming die, and the skeleton insert is arranged in the wheel hub, so that the wheel hub has higher cooling efficiency during forming, and the injection molding time is reduced; and the skeleton inserts are used as the filling skeleton of the wheel hub, so that the cooling deformation of the plastic on the periphery of the skeleton inserts can be reduced, and the molding quality is ensured.

Drawings

Fig. 1 is a perspective view of a hub according to a preferred embodiment of the present application.

Fig. 2 is a half sectional view of fig. 1 according to a preferred embodiment of the present application.

Fig. 3 is a perspective view of a hub according to a preferred embodiment of the present application after further modification.

Fig. 4 is a half sectional view of fig. 3 in accordance with a preferred embodiment of the present application.

FIG. 5 is an enlarged view at A of FIG. 4 in accordance with a preferred embodiment of the present application.

Fig. 6 is a schematic structural view of a forming die according to a preferred embodiment of the present application.

FIG. 7 is a diagram of the location of the hub and cooling device according to a preferred embodiment of the present application.

Fig. 8 is a half sectional view of fig. 7 in accordance with a preferred embodiment of the present application.

Fig. 9 is a perspective view of a skeleton insert placed on a cooling device according to a preferred embodiment of the present application.

FIG. 10 is a cross-sectional view taken through the center of the inlet and outlet channels of FIG. 9 according to a preferred embodiment of the present application.

FIG. 11 is a cross-sectional view of the water inlet channel and the water outlet channel of FIG. 9 taken along a central location thereof according to a preferred embodiment of the present application.

FIG. 12 is an enlarged view at B of FIG. 10 according to a preferred embodiment of the present application.

FIG. 13 is an enlarged view at C of FIG. 11 in accordance with a preferred embodiment of the present application.

Fig. 14 is a perspective view of a skeletal insert in accordance with a preferred embodiment of the present application.

Figure 15 is a cross-sectional view taken through the center of the inlet and outlet apertures of figure 14 according to a preferred embodiment of the present application.

FIG. 16 is a cross-sectional view of FIG. 14 taken along a center location of one of the sets of inlet and outlet openings in accordance with a preferred embodiment of the present application.

Fig. 17 is an exploded view of a skeleton insert according to a preferred embodiment of the present application.

Fig. 18 is a perspective view of a cooling device according to a preferred embodiment of the present application.

FIG. 19 is a bottom view of a cooling device according to a preferred embodiment of the present application.

FIG. 20 is a cross-sectional view taken along the direction D-D in FIG. 19, in accordance with a preferred embodiment of the present application.

FIG. 21 is a cross-sectional view taken along the direction E-E in FIG. 19, in accordance with a preferred embodiment of the present application.

FIG. 22 is a perspective view of a nozzle according to a preferred embodiment of the present application.

In the figure: 100. a hub; 101. an inner ring; 102. an outer ring; 103. spokes; 104. a bolt passage; 10. a skeleton insert; 200. forming a mold; 11. a cooling channel; 12. a central shaft hole; 13. a water inlet hole; 14. a water outlet hole; 15. an air inlet; 16. an air outlet; 17. a wear-resistant sleeve; 18. supporting the bump; 19. a fool-proof mark; 10a, a base; 10b, an upper cover; 20. a stationary die assembly; 30. a movable die assembly; 40. a cavity; 50. a cooling device; 51. a central column; 52. a convex edge; 53. a water inlet channel; 54. a water outlet channel; 55. an air intake passage; 56. an air outlet channel; 57. mounting a disc; 58. a positioning column; 59. a nozzle; 591. a slide pipe; 592. a spring; 593. a limiting ring; 5911. a guide slope.

Detailed Description

The present application is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.

In the description of the present application, it should be noted that, for the terms of orientation, such as "central", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., it indicates that the orientation and positional relationship shown in the drawings are based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be construed as limiting the specific scope of protection of the present application.

It is noted that the terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

The terms "comprises," "comprising," and "having," and any variations thereof, in the description and claims of this application, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

As shown in fig. 1 and 2, a hub 100 of a preferred embodiment of the present application is adapted for injection molding with thermoplastic-added carbon fiber pellets. 100 parts of thermoplastic plastics and preferably 50 parts of carbon fiber particles by weight; wherein the thermoplastic plastic main body component is polypropylene. The component distribution of the injection molding material of the embodiment can be adjusted according to the parameter requirements of the hub, and other necessary additives are considered, but the specific numerical values are not the key points to be protected in the application and are not particularly expanded.

The wheel hub 100 is made of composite materials (thermoplastic plastics are added with carbon fiber particles), and has the advantage of high strength; compared with a hub taking carbon fibers as a main body, the hub has the advantages that the weight is reduced by about 30-40%; and meanwhile, the material cost is lower. In addition, the wheel hub 100 of the scheme is formed by injection molding, the process is simpler, the forming precision is higher, a more complex wheel hub structure can be formed, stress concentration can be avoided, and the forming quality is higher.

As shown in fig. 1 and 2, the wheel hub 100 includes an inner ring 101, an outer ring 102 and spokes 103, wherein a central shaft hole 12 is formed at a middle position of the inner ring 101, five bolt passages 104 are formed around the central shaft hole 12 for connecting an axle, and the outer ring 102 is used for connecting a tire. As can be seen from fig. 2, in order to ensure sufficient mounting strength of the hub 100, the inner ring 101 is usually thickened. Because the hub 100 of the present embodiment is formed by injection molding, the inner ring 101 is formed by solidifying a large amount of plastic, and the cooling solidification time is long, which greatly reduces the injection molding efficiency; moreover, due to the effects of expansion with heat and contraction with cold, the hub 100 is easily cooled and deformed, and particularly, a recess is easily formed at the position of the inner ring 101, which affects the product quality.

Based on the above problems, the present application improves the wheel hub 100 itself, specifically, as shown in fig. 3 to 5, the wheel hub 100 of the present embodiment has a skeleton insert 10 embedded in an inner ring 101, and a cooling channel 11 is formed in the skeleton insert 10; the cooling channels 11 are adapted to being fed with a cooling medium during injection moulding. The skeleton insert 10 is preferably made of a metallic material, such as cast iron, stainless steel, or an aluminum alloy.

For the improved wheel hub 100, the present application further designs a dedicated forming mold 200, specifically as shown in fig. 6 to 22, the forming mold 200 includes a fixed mold component 20 and a movable mold component 30, a cavity 40 is disposed between the fixed mold component 20 and the movable mold component 30, a cooling device 50 is disposed in the movable mold component 30, the cooling device 50 is adapted to extend into the cavity 40, and the cooling device 50 is adapted to place the skeleton insert 10 and communicate with the cooling channel 11. The key point of the present application is that the skeleton insert 10 is used as a filling skeleton of the wheel hub 100 and a cooling structure of the forming mold 200, and has the advantages of improving the cooling efficiency of the forming mold 200 and ensuring the forming quality of the wheel hub 100.

It should be noted that the specific structure and the mode of opening and closing of the fixed mold assembly 20 and the movable mold assembly 30 are well known and not specifically described in the present embodiment, but this does not prevent the technical features from being implied in the present application. On the basis of the actions of the fixed die assembly 20 and the movable die assembly 30, the specific working principle of the framework insert 10 and the cooling device 50 is as follows:

before injection molding, the framework insert 10 is suitable for being fixedly placed on the cooling device 50 and positioned in the cavity 40; during injection molding, the thermoplastic plastics added with the carbon fiber particles are suitable for entering the cavity 40 and coating the skeleton insert 10 to form the hub 100, and meanwhile, a cooling medium is suitable for entering the cooling channel 11 from the cooling device 50; after injection molding, the hub 100 is adapted to be disengaged from the cavity 40 and the skeleton insert 10 is separated from the cooling device 50.

More specifically, as shown in fig. 9 to 21, the skeleton insert 10 is an annular structure, a central shaft hole 12 is formed in the middle of the skeleton insert 10, a water inlet hole 13 and a water outlet hole 14 are formed in the inner wall of the skeleton insert 10, two sides of the water inlet hole 13 and the water outlet hole 14 are respectively communicated with the cooling channel 11 and the central shaft hole 12, the cooling device 50 includes a central cylinder 51, the central cylinder 51 is suitable for being tightly attached to and penetrating through the central shaft hole 12, a convex edge 52 is arranged on the peripheral side of the central cylinder 51, the skeleton insert 10 is suitable for being placed against the convex edge 52, a water inlet channel 53 and a water outlet channel 54 are formed in the central cylinder 51, and the water inlet channel 53 and the water outlet channel 54 respectively extend to the side wall of the central cylinder 51; when the skeleton insert 10 is fixedly placed on the cooling device 50, the water inlet channel 53 is suitable for being communicated with the water inlet hole 13, and the water outlet channel 54 is suitable for being communicated with the water outlet hole 14. The water cooling is a common cooling method for the mold, and the cooling device 50 of the present embodiment can be seamlessly connected to the mold water cooling system and is suitable for controlling the water circulation through the electromagnetic valve.

As shown in fig. 14 to 17, since the cooling channel 11 has a large volume, the water inlet holes 13 and the water outlet holes 14 of the present embodiment are respectively provided with three water inlet holes and three water outlet holes, and are uniformly and alternately distributed along the circumferential direction, so as to increase the water inlet amount and the water outlet amount and improve the cooling efficiency; as shown in fig. 19, of course, three sets of water inlet channels 53 and water outlet channels 54 are also needed. The forming die 200 of this embodiment adopts vertical structure, and skeleton insert 10 is fixed along vertical direction and is placed on cooling device 50 promptly, as shown in fig. 21, designs inlet opening 13 and is located 11 upper ends of cooling channel, and apopore 14 is located 11 lower extremes of cooling channel, adopts the mode of going into from top to bottom for cooling water can flow out from apopore 14 under the action of gravity, with the residue of reduction cooling water in cooling channel 11.

As shown in fig. 9 to 21, in order to further reduce the cooling water residue, in this embodiment, the inner wall of the skeleton insert 10 is further provided with an air inlet hole 15 and an air outlet hole 16, two sides of the air inlet hole 15 and the air outlet hole 16 are respectively communicated with the cooling channel 11 and the central shaft hole 12, the central column 51 is further provided with an air inlet channel 55 and an air outlet channel 56, and the air inlet channel 55 and the air outlet channel 56 respectively extend to the side wall of the central column 51; when the skeleton insert 10 is fixedly placed on the cooling device 50, the air inlet channel 55 is suitable for being communicated with the air inlet hole 15, and the air outlet channel 56 is suitable for being communicated with the air outlet hole 16. Air inlet channel 55 and air outlet channel 56 are connected exhaust system, adopt the mode of negative pressure absorption to adsorb remaining cooling water in cooling channel 11, avoid in a large amount of cooling water flows to die cavity 40 or on the injection molding machine, influence normally moulding plastics. In addition, the air circulation and the process of evaporating the cooling water caused by the air circulation can take away a large amount of heat in the cooling channel 11, so that the cooling effect is achieved, the wheel hub 100 can be cooled for the second time, and the cooling efficiency is further improved.

It is expected that the hub 100 of this embodiment will have high strength, but will generally have wear resistance, particularly at the location of the bolt passages 104, requiring long contact with the fastening bolts and being prone to wear.

Based on the above problem, as shown in fig. 9 to 21, the skeleton insert 10 of the present embodiment is further provided with five wear-resistant sleeves 17, the five wear-resistant sleeves 17 are suitable for forming a bolt channel 104 on the inner ring 101, so that a fastening bolt directly contacts the wear-resistant sleeves 17, and the wear-resistant sleeves 17 are also made of a metal material and have high wear resistance; correspondingly, a mounting disc 57 is further disposed on the periphery of the central column 51, a plurality of positioning columns 58 extend from the mounting disc 57, and the positioning columns 58 are suitable for tightly adhering to and penetrating through the wear-resistant sleeve 17. It can be seen that the wear-resistant sleeve 17, in cooperation with the positioning column 58, can also limit the placement position of the skeleton insert 10 on the cooling device 50, so as to prevent the skeleton insert 10 from rotating.

In order to implement a specific processing technology, in order to facilitate processing of the cooling channel 11, as shown in fig. 17, in this embodiment, the skeleton insert 10 is divided into a base 10a and an upper cover 10b, the cooling channel 11 is formed on the base 10a, and the upper cover 10b is hermetically fixed on the base 10a, preferably by welding. Furthermore, the base 10a is further provided with a plurality of supporting protrusions 18, the upper cover 10b is suitable for abutting against the supporting protrusions 18, and the supporting protrusions 18 not only support the upper cover 10b, increase the strength of the skeleton insert 10, but also increase the contact area between the skeleton insert 10 and cooling water and cooling air, thereby improving the cooling efficiency. Because skeleton inserts 10 and cooling device 50 are the solid of revolution structure, still be provided with on upper cover 10b and prevent slow-witted sign 19, supply robot or manual identification, avoid skeleton inserts 10 dislocation to place.

As shown in fig. 13, 21 and 22, in order to reduce the leakage of the cooling water, nozzles 59 are provided on both the water inlet passage 53 and the water outlet passage 54; when the skeleton insert 10 is fixedly placed on the cooling device 50, the nozzle 59 is suitable for being hermetically embedded into the water outlet hole 13 or the water inlet hole 14; the nozzle 59 comprises a sliding tube 591, a spring 592 and a limit ring 593, the sliding tube 591 slides and is arranged in the water inlet channel 53 or the water outlet channel 54 in a clinging manner, the limit ring 593 is fixedly arranged in the water inlet channel 53 or the water outlet channel 54, the spring 592 is arranged between the sliding tube 591 and the limit ring 593 and is suitable for forcing the sliding tube 591 to slide outwards, and a guide inclined surface 5911 is arranged on the outer side surface of the sliding tube 591; during placement of the skeleton insert 10 in the cooling device 50, the lower edge of the skeleton insert 10 is adapted to abut against the guiding slope 5911 and push the sliding tube 591 to slide inwards, and after placement in place, the spring 592 is adapted to push the sliding tube 591 to slide outwards and into the water outlet hole 13 or the water inlet hole 14. The outer edges of the water outlet hole 13 and the water inlet hole 14 are preferably chamfered so as to be tightly attached to the guide inclined surface 5911 and increase the sealing performance.

The foregoing has described the general principles, essential features, and advantages of the application. It will be understood by those skilled in the art that the present application is not limited to the embodiments described above, which are merely illustrative of the principles of the application, but that various changes and modifications may be made without departing from the spirit and scope of the application, and these changes and modifications are intended to be within the scope of the application as claimed. The scope of protection claimed by this application is defined by the following claims and their equivalents.

Claims

1. An injection molded wheel hub, comprising: the hub is suitable for injection molding by adding carbon fiber particles into thermoplastic plastics; the hub comprises an inner ring, an outer ring and spokes, wherein a skeleton insert is embedded in the inner ring, and a cooling channel is formed in the skeleton insert; the cooling channel is suitable for introducing a cooling medium during injection molding.

2. The injection molded hub of claim 1, wherein: 100 parts of thermoplastic plastic and 20 to 200 parts of carbon fiber particles by weight; the thermoplastic comprises polypropylene.

3. A forming die for forming the wheel hub in claim 1, comprising a fixed die assembly and a movable die assembly, wherein a cavity is formed between the fixed die assembly and the movable die assembly, and the forming die is characterized in that: a cooling device is arranged in the movable die assembly, the cooling device is suitable for extending into the cavity, and the cooling device is suitable for placing the framework insert and is communicated with the cooling channel;

4. The molding die of claim 3, wherein: the framework insert is of an annular structure, a central shaft hole is formed in the middle of the framework insert, a water inlet hole and a water outlet hole are formed in the inner wall of the framework insert, two sides of the water inlet hole and the two sides of the water outlet hole are respectively communicated with the cooling channel and the central shaft hole, the cooling device comprises a central cylinder, the central cylinder is suitable for penetrating through the central shaft hole, a water inlet channel and a water outlet channel are formed in the central cylinder, and the water inlet channel and the water outlet channel respectively extend to the side wall of the central cylinder; when the framework insert is fixedly placed on the cooling device, the water inlet channel is suitable for being communicated with the water inlet hole, and the water outlet channel is suitable for being communicated with the water outlet hole.

5. The molding die according to claim 4, wherein: the inner wall of the framework insert is also provided with an air inlet hole and an air outlet hole, two sides of the air inlet hole and the air outlet hole are respectively communicated with the cooling channel and the central shaft hole, the central cylinder is also provided with an air inlet channel and an air outlet channel, and the air inlet channel and the air outlet channel respectively extend to the side wall of the central cylinder; when the framework insert is fixedly arranged on the cooling device, the air inlet channel is suitable for being communicated with the air inlet hole, and the air outlet channel is suitable for being communicated with the air outlet hole.

6. The molding die of claim 4, wherein: the framework insert is also provided with a plurality of wear-resistant sleeves, and the plurality of wear-resistant sleeves are suitable for forming bolt channels on the inner ring; the periphery of the central column body is further provided with an installation disc, a plurality of positioning columns extend out of the installation disc, and the positioning columns are suitable for being tightly attached to and penetrate through the wear-resistant sleeve.

7. The molding die of claim 3, wherein: the framework insert comprises a base and an upper cover, the cooling channel is formed on the base, and the upper cover is hermetically fixed on the base; the base is also provided with a plurality of supporting lugs, and the upper cover is suitable for abutting against the supporting lugs; the upper cover is provided with a fool-proof mark.

8. The molding die of claim 4, wherein: nozzles are arranged on the water inlet channel and the water outlet channel; when the framework insert is fixedly placed on the cooling device, the nozzle is suitable for being hermetically embedded into the water outlet hole or the water inlet hole.

9. The molding die of claim 8, wherein: the central cylinder is suitable for tightly penetrating through the central shaft hole; the nozzle comprises a sliding pipe, a spring and a limiting ring, the sliding pipe slides and is arranged in the water inlet channel or the water outlet channel in a clinging mode, the limiting ring is fixedly arranged in the water inlet channel or the water outlet channel, the spring is arranged between the sliding pipe and the limiting ring and is suitable for forcing the sliding pipe to slide outwards, and a guide inclined plane is arranged on the outer side face of the sliding pipe; the framework insert is placed in the cooling device, the lower edge of the framework insert is suitable for abutting against the guide inclined plane and pushing the sliding pipe to slide inwards, and after the framework insert is placed in place, the spring is suitable for pushing the sliding pipe to slide outwards and enter the water outlet hole or the water inlet hole.

10. The molding die of claim 4, wherein: the central cylinder is suitable for tightly penetrating through the central shaft hole, a convex edge is arranged on the peripheral side of the central cylinder, and the framework insert is suitable for being placed in a mode of abutting against the convex edge;

the water inlet holes and the water outlet holes are respectively provided with a plurality of water inlet holes and a plurality of water outlet holes which are evenly and alternately distributed along the circumferential direction; the framework insert is fixedly placed on the cooling device along the vertical direction, the water inlet hole is formed in the upper end of the cooling channel, and the water outlet hole is formed in the lower end of the cooling channel.