Expansion forming die and forming assembly

Abstract

The utility model relates to an expansion forming die and a forming assembly. The expansion forming die comprises a guide column, a lower punching sleeve and an upper punching sleeve. The lower punching sleeve is clamped and fixed with the end part of the guide post through a clamping part on the inner wall, the upper punching sleeve is in sliding fit with the other end of the guide post, a movable area is reserved between the upper punching sleeve and the guide post, a limiting part on the inner wall of the upper punching sleeve can extend into the movable area through elastic connection, and an abutting point on the limiting part and a clamping point on the clamping part are positioned on the same plane when abutting against the guide post; the first limiting part and the second limiting part have height difference in the height direction, the projections of the first limiting part and the second limiting part are overlapped and are arranged in parallel, the abutting points are located in the same face, each limiting part comprises an arc part, the circle center of the arc part faces upwards, the forming assembly comprises the die and a rotor retaining ring arranged in a guide column through groove, and the lower punching sleeve and the upper punching sleeve are located on the two sides of the retaining ring respectively. The connecting line of the abutting point and the clamping point is perpendicular to the cross section of the retaining ring, and the limiting part and the clamping part are both parallel to the cross section of the retaining ring. According to the utility model, the die can be quickly and accurately aligned.

Description

Technical Field

[0001] The utility model relates to the technical field of mold engineering, in particular to an expansion molding mold and a molding component. Background Art

[0002] In the manufacturing process of generator rotor guard rings, hydraulic expansion forming is a widely used technical means. This process places extremely high demands on the precise alignment of the upper and lower punch sleeves of the mold. However, in actual production scenarios, the mold often faces potential challenges during transfer and handling - the upper and lower punch sleeves may have subtle displacement deviations due to various uncertain factors, such as transportation bumps, loading and unloading vibrations, or changes in ambient temperature and humidity.

[0003] After the mold transfer is completed, the traditional alignment method relies on manual and meticulous adjustments. This process is not only complicated and time-consuming, but also inevitably introduces subjective errors in manual operation, and it is impossible to ensure that each alignment can achieve the ideal high-precision level. This practical problem has a direct impact on the molding quality of the rotor guard ring. Once the upper and lower punch sleeves are not accurately aligned, the final molded guard ring will have reduced dimensional accuracy, uneven thickness, poor surface quality, and other problems, which will seriously affect the overall performance and service life of the generator rotor. Utility Model Content

[0004] The utility model aims to provide an expansion forming die and a forming assembly to solve the problem of inconvenient forming die alignment proposed by the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A kind of expansion forming mold, comprises a guide column, a lower punch sleeve and an upper punch sleeve; a through groove is opened on the side wall of the guide column; a clamping part is provided on the inner wall of the lower punch sleeve, and the clamping part has a plurality of clamping points, which are used to clamp the lower punch sleeve to one end of the guide column; the upper punch sleeve is sleeved on the other end of the guide column, the upper punch sleeve and the guide column are slidably matched, and there is a movable area between the inner wall of the upper punch sleeve and the side wall of the guide column; a plurality of limiting parts are provided on the inner wall of the upper punch sleeve, the limiting parts are elastically connected with the upper punch sleeve, the limiting parts can extend into the movable area, and the limiting parts have a plurality of abutting points, which are used to abut the guide column; wherein, when the limiting parts abut against the guide column, all the abutting points on the limiting parts and all the clamping points on the clamping parts are located on the same plane.

[0007] Furthermore, the plurality of limiting portions include at least a first limiting portion and a second limiting portion, and along a height direction of the active area, there is a height difference between the first limiting portion and the second limiting portion.

[0008] Furthermore, projections of the first limiting portion and the second limiting portion in the height direction of the active area have an overlapping portion.

[0009] Furthermore, the first limiting portion and the second limiting portion are parallel.

[0010] Furthermore, a plurality of the abutment points are arranged at one end of the limiting portion close to the guide post, and along the height direction of the guide post, the plurality of the abutment points are located in the same plane.

[0011] Furthermore, the limiting portion has an arc portion, and the arc portion is arranged on the lower side of the plurality of abutment points, and the center of the arc portion is located upward.

[0012] A forming assembly, comprising the above-mentioned expansion forming die and a rotor guard ring; the rotor

[0013] The guard ring is inserted into the through groove of the guide column, the lower punch sleeve is arranged on one side of the rotor guard ring, and the upper punch sleeve is arranged on the other side of the rotor guard ring; wherein, when the lower punch sleeve and the upper punch sleeve are aligned, the connecting line of several abutment points and several clamping points is perpendicular to the cross section of the rotor guard ring.

[0014] Furthermore, the limiting portion and the clamping portion are both parallel to the cross section of the rotor guard ring.

[0015] The advantages of the expansion forming mold described in the utility model over the prior art are:

[0016] By arranging the clamping part on the lower punch sleeve, it is ensured that the lower punch sleeve will not deviate from its proper position under any circumstances.

[0017] At the same time, by providing a limiting part elastically connected to the upper punch sleeve, even if there is a slight shake or displacement during transportation or other operations, it can automatically return to the precise predetermined position at the moment the mold closes by relying on the power of the elastic limiting part, without the need for additional manual intervention.

[0018] More importantly, when the mold enters the closed state, the clamping part of the inner wall of the lower punch sleeve and the clamping point on the guide column form a seamless linkage mechanism. At this time, each abutment point on the limiter will be precisely on the same reference plane as the clamping point on the clamping part. This ingenious structural design quickly realizes the fast and accurate alignment between the upper and lower punch sleeves, greatly reduces the frequency of manual adjustment, thus greatly improving work efficiency, and also effectively guarantees the high precision requirements of the molded products.

[0019] The advantages of the molding assembly described in the utility model over the prior art are:

[0020] The rotor guard ring is inserted into the through groove of the guide column. Through the precise alignment of the lower punch sleeve and the upper punch sleeve, the verticality and accuracy of the pressure transmission during the forming process are ensured, thereby ensuring the forming quality of the rotor guard ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] Figure 2 It is a plan view of the utility model;

[0023] Figure 3 It is a structural schematic diagram of the guide column of the utility model;

[0024] Figure 4 It is a partial structural schematic diagram of the upper punch sleeve of the utility model;

[0025] Figure 5 It is a plan view of the limiting part of the utility model.

[0026] Markings and corresponding parts names in the attached drawings:

[0027] Guide column, 101, through groove, 20, lower punch sleeve, 201, clamping part, 2011, clamping point, 30, upper punch sleeve, 301, limiting part, 3011, abutment point, 302, first limiting part, 303, second limiting part, 40, arc part, 50, rotor guard ring. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0029] Example 1: Figure 1 As shown, an expansion forming mold provided in this embodiment includes a guide column 10, a lower punch sleeve 20 and an upper punch sleeve 30; the guide column 10 is made of high-strength steel, and its side wall

[0030] A through groove 101 adapted to the shape of the rotor guard ring 50 is milled on the upper surface for accommodating the rotor guard ring 50 to be formed.

[0031] The lower punch sleeve 20 can be made of a material with excellent wear resistance, such as a high-hardness alloy or other wear-resistant materials suitable for mold working conditions. Its inner wall design can include four annularly arranged clamping parts 201, which can be fixed on the inner wall of the lower punch sleeve 20 by welding technology to ensure its firmness and stability.

[0032] Regarding the specific form of the clamping portion 201, it can be designed as an annular structure, which is evenly distributed around the inner wall of the lower punch sleeve 20. It is worth noting that the number and layout of the clamping points 2011 on these clamping portions 201 can be set as needed, and they can cooperate with the corresponding structure (such as a groove or a protrusion) at the end of the guide pillar 10, so that when the mold is assembled, the lower punch sleeve 20 can be accurately fixed through the clamping cooperation between the clamping points 2011 and the guide pillar 10.

[0033] When the mold needs to be installed, the lower punch sleeve 20 can be sleeved on one end of the guide column 10, and the clamping point 2011 on the clamping portion 201 can be smoothly embedded in the groove on the guide column 10 by rotating or gently tapping. In this way, during the expansion molding process, no matter what force is applied, the lower punch sleeve 20 can maintain a good fixed state, thereby ensuring the expansion molding accuracy and product quality of the rotor guard ring 50.

[0034] The upper punch sleeve 30 is also made of high-performance wear-resistant materials to ensure its durability and stability during repeated use. The upper punch sleeve 30 is designed to slide along the guide post 10, and the movable area between its inner wall and the side wall of the guide post 10 provides the necessary flexibility for precise positioning. On the inner wall of the upper punch sleeve 30, there are provided a plurality of limit portions 301, which can be

[0035] The elastic component is elastically connected to the upper punch sleeve 30 body, so that when the mold is working, the limiting portion 301 can extend into or withdraw from the active area as needed.

[0036] Specifically, a fine groove structure can be pre-opened on the inner wall of the upper punch sleeve 30, and the function of these grooves is to accommodate the spring device, one end of which can be fastened to the bottom of the groove by bolts to ensure the stability of the spring during the operation of the upper punch sleeve 30. The other end of the spring is fixedly connected to the limit part 301 in the same way, for example, by using bolts to pass through the preset holes of the spring and the limit part 301 for fixing.

[0037] Before the mold is put into use, that is, before the upper punch sleeve 30 is inserted into the guide post 10, the limiting portion 301 is pre-extended into the active area between the inner wall of the upper punch sleeve 30 and the side wall of the guide post 10 under the thrust of the spring. Such a design ensures that when the mold is installed, after the upper punch sleeve 30 contacts the guide post 10, the limiting portion 301 can gradually contact the guide post 10 as the upper punch sleeve 30 slides along the guide post 10, and the abutment point 3011 can accurately contact the guide post 10 under the action of the spring.

[0038] The limiting portion 301 is provided with a plurality of abutment points 3011, which can be designed and arranged according to the mold structure and process requirements to ensure that when abutting with the guide pillar 10, all abutment points 3011 and the clamping points 2011 on the clamping portion 201 on the inner wall of the lower punch sleeve 20 can be located on the same plane. The purpose of such a design is to ensure that the upper punch sleeve 30 and the lower punch sleeve 20 are accurately aligned when the mold is closed, thereby achieving accurate bulging of the rotor guard ring 50.

[0039] Embodiment 2: Based on the above embodiment, in order to achieve a more precise and reliable limiting effect,

[0040] A multi-stage limiting structure is designed, which includes at least a first limiting portion 302 and a second limiting portion 303. The two portions are arranged along the height direction of the active area, with a clear height difference between them, thereby forming a stepped limiting system.

[0041] Specifically, the first limiting portion 302 can be placed above the second limiting portion 303 to ensure that the second limiting portion 303 first contacts the guide post 10 and performs preliminary positioning during the downward movement of the upper punch sleeve 30. The bottom position of the second limiting portion 303 can be adjusted according to actual needs.

[0042] On the one hand, the bottom of the first limiting portion 302 can be arranged above the top of the second limiting portion 303. In this configuration, when the upper punch sleeve 30 starts to move downward, the second limiting portion 303 first contacts the guide post 10 and starts the limiting action. As the upper punch sleeve 30 continues to be pressed downward, the first limiting portion 302 gradually contacts the guide post 10, forming a double limit, ensuring the precise alignment of the upper punch sleeve 30 and the lower punch sleeve 20.

[0043] On the other hand, the bottom of the first limiting portion 302 can also be set between the bottom and the top of the second limiting portion 303, but closer to the top. In this case, although the second limiting portion 303 contacts the guide post 10 first, after the upper punch sleeve 30 moves down a certain distance, the first limiting portion 302 quickly follows up and completes the limiting almost at the same time as the second limiting portion 303, forming a continuous limiting mechanism, ensuring stable contact and accurate alignment between the upper punch sleeve 30 and the guide post 10.

[0044] In addition, since the bottom of the first limiting portion 302 is closer to the top of the second limiting portion 303, this layout makes the distance between the first limiting portion 302 and the second limiting portion 303 shorter, and the limiting can be achieved more quickly, thereby improving the response speed and working efficiency of the mold.

[0045] At the same time, since the abutment points 3011 of the first limiting portion 302 and the second limiting portion 303 complete the limiting at almost the same time, the impact force concentration and mold wear problems caused by the single limiting portion 301 contacting the guide pillar 10 too early can be effectively avoided, thereby improving the stability and durability of the mold.

[0046] Embodiment 3: Based on the above embodiment, the projections of the first limiting portion 302 and the second limiting portion 303 in the height direction of the active area have an overlapping part, that is, when observed from the height direction perpendicular to the active area, the first limiting portion 302 and the second limiting portion 303 have a certain intersection.

[0047] For example, the bottom of the first limiting portion 302 can be arranged above the top of the second limiting portion 303, and one side of the first limiting portion 302 can be arranged between the two sides of the second limiting portion 303. In this way, when the upper punch sleeve 30 moves downward along the guide column 10, after the second limiting portion 303 contacts the guide column 10 and performs preliminary positioning, as the upper punch sleeve 30 continues to move downward, the bottom of the first limiting portion 302 begins to contact the guide column 10. At the same time, since one side of the first limiting portion 302 is arranged between the two sides of the second limiting portion 303, the projections of the first limiting portion 302 and the second limiting portion 303 in the height direction of the active area overlap, that is, a partial area of ​​the first limiting portion 302 covers a partial area of ​​the second limiting portion 303.

[0048] The advantage of this overlapping design is that it can ensure that at different stages of the upper punch sleeve 30 moving downward, there are always at least two limiting parts 301 to simultaneously position the upper punch sleeve 30, forming a continuous and stable limiting chain, thereby improving the positioning accuracy and stability of the mold.

[0049] The degree of upward projection overlap can flexibly adjust the positioning response speed and strength of the mold to adapt to different process requirements and expansion molding needs of the rotor guard ring 50.

[0050] Embodiment 4: Based on the above embodiment, the first limiting portion 302 and the second limiting portion 303 are parallel, which means that they are arranged horizontally in the height direction of the active area and the distance between them is kept constant. This design aims to enhance the positioning accuracy and stability of the mold during the expansion molding process by maintaining the parallel relationship between the limiting portions 301.

[0051] Specifically, the first limiting portion 302 and the second limiting portion 303 can be completely parallel, that is, they are located on the same plane in the height direction perpendicular to the active area. This arrangement can ensure that when the upper punch sleeve 30 moves downward along the guide column 10, the first limiting portion 302 and the second limiting portion 303 always position the upper punch sleeve 30 at the same height, forming a continuous and stable limiting chain, thereby improving the positioning accuracy and stability of the mold.

[0052] Of course, the first limiting portion 302 and the second limiting portion 303 can also be staggered and parallel, that is, they are located on different planes in the height direction perpendicular to the active area, and the distance between them is constantly changing. This arrangement can achieve continuous positioning of the upper punch sleeve 30, that is, at different stages of the downward movement of the upper punch sleeve 30, different limiting portions 301 are used to position the upper punch sleeve 30, forming a continuous and stable limiting chain, thereby improving the positioning accuracy and stability of the mold.

[0053] Embodiment 5: Based on the above embodiment, a plurality of abutment points 3011 are arranged at one end of the limiting portion close to the guide post 10 , and along the height direction of the guide post 10 , the plurality of abutment points 3011 are located in the same plane.

[0054] Specifically, the surface where the abutment points 3011 are located can be a plane. This design is concise and clear, easy to process and manufacture, and can achieve precise positioning of the upper punch sleeve 30 along the height direction of the guide column 10.

[0055] The surface where the abutment points 3011 are located can also be a curved surface, and the surface where the abutment points 3011 are located is designed to be a curved surface that matches the outer wall of the guide post 10, so that when the upper punch sleeve 30 moves along the guide post 10, the abutment points 3011 can maintain continuous and uniform contact with the surface of the guide post 10. This curved surface can be an accurate replica of the outer wall of the guide post 10. For example, if the guide post 10 is cylindrical, the surface where the abutment points 3011 are located is a coaxial circular curved surface; if the outer wall of the guide post 10 has a special profile (such as a cone, an arc, etc.), the surface where the abutment points 3011 are located is correspondingly designed to be a curved surface that matches it. The curved surface design can effectively cope with and ensure the precise positioning of the upper punch sleeve 30 in various positions.

[0056] Embodiment 6: Based on the above embodiment, an arc portion 40 is specially added to the structure of the position limiting portion 301, and the arc portion 40 is located at the lower side of the plurality of abutment points 3011, and its center is facing upward. This design aims to achieve a smooth transition and buffering effect of the upper punch sleeve 30 contacting the guide pillar 10 during the downward movement process through the morphological characteristics of the arc portion 40, reduce the impact force between the mold parts, protect the mold structure, and extend its service life.

[0057] Specifically, the arc portion 40 can be designed to be semicircular or elliptical, and its diameter or major axis length should match the diameter or related dimensions of the guide column 10 to ensure that the arc portion 40 can fully cover the contact area below the abutment point 3011. The center of the arc portion 40 is located in the upward direction.

[0058] That is, the side close to the central axis of the upper punch sleeve 30 , so that when the upper punch sleeve 30 moves downward, the arc portion 40 can contact the guide column 10 before the abutment point 3011 , thereby dispersing part of the impact force in advance and reducing the direct pressure on the abutment point 3011 .

[0059] Example 7: This example provides an expansion molding die and a rotor guard ring 50 as described above. The rotor guard ring 50 is one of the key components of the generator, and its quality directly affects the operating performance and life of the generator. Before expansion molding, the rotor guard ring 50 is inserted into the through groove 101 of the guide column 10 to ensure that it is concentric with the guide column 10.

[0060] When the lower punch sleeve 20 and the upper punch sleeve 30 are aligned, the position of the upper punch sleeve 30 is adjusted to ensure that the connecting line of the plurality of abutment points 3011 and the plurality of clamping points 2011 is perpendicular to the cross section of the rotor guard ring 50. This design can ensure that the extrusion force of the upper punch sleeve 30 and the lower punch sleeve 20 on the rotor guard ring 50 is evenly distributed during the expansion forming process, thereby avoiding deformation or rupture of the guard ring due to excessive local stress.

[0061] Embodiment 8: Based on the above embodiments, the limiting portion 301 and the clamping portion 201 are both parallel to the cross section of the rotor guard ring 50. That is to say, in the actual application of the expansion molding mold, whether it is the limiting portion 301 or the clamping portion 201, its relative position with the cross section of the rotor guard ring 50 always remains parallel, rather than tilted or crossed.

[0062] Specifically, the stopper 301 disposed on the inner wall of the upper punch sleeve 30 has abutment points 3011 distributed thereon that will contact the guide pillar 10 when the mold is working, thereby limiting the movement range of the upper punch sleeve 30 to ensure accurate alignment of the mold.

[0063] When they are parallel, it means that during the process of the mold closing and applying pressure to the rotor guard ring 50, the force applied by the abutment point 3011 is always along the radial direction of the guard ring, avoiding lateral force caused by angle deviation, thereby ensuring uniform force and good molding effect of the guard ring during the expansion process.

[0064] The clamping portion 201 of the inner wall of the lower punch sleeve 20 is fixedly connected to the guide pillar 10 through the clamping point 2011, ensuring that the lower punch sleeve 20 remains stable during the expansion forming process. When the clamping portion 201 is parallel to the cross section of the rotor guard ring 50, it means that the contact surface between the clamping point 2011 and the guide pillar 10 is consistent with the radial direction of the guard ring, which also avoids the lateral force caused by the angle deviation and ensures the accuracy and stability of the pressure applied by the lower punch sleeve 20 to the guard ring.

[0065] In this embodiment, the limiting portion 301 and the clamping portion 201 are designed to be parallel to the cross section of the rotor guard ring 50, aiming to eliminate the possible influence of lateral forces by optimizing the relative position relationship between the various parts of the mold and the guard ring, thereby ensuring that the rotor guard ring 50 is subjected to uniform force and has excellent molding effect during the expansion molding process, thereby improving the quality and consistency of the final product.

[0066] Working principle: When the mold is used to expand the rotor guard ring 50, first, the guide column 10 plays a role of central support and guidance, and the through groove 101 on its side wall is used to accommodate the rotor guard ring 50. The lower punch sleeve 20 cooperates with the clamping point 2011 at one end of the guide column 10 through the clamping part 201 on its inner wall, thereby achieving fixed and accurate installation and positioning.

[0067] The upper punch sleeve 30 can slide along the guide post 10, and a movable area is left between its inner wall and the side wall of the guide post 10. A limiting structure including at least a first limiting portion 302 and a second limiting portion 303 is arranged in this area. The two limiting portions 301 have a certain height in the height direction.

[0068] There is a difference, and there is an overlapping part in their projections in the height direction of the active area, so as to ensure that the upper punch sleeve 30 gradually and smoothly contacts with the guide column 10 during the movement process, thereby realizing multi-level limit control.

[0069] The first limiting portion 302 and the second limiting portion 303 are both arranged in parallel, and the abutment points 3011 arranged on one end close to the guide column 10 are located in the same height plane. When these abutment points 3011 abut against the guide column 10, they are on the same plane as the surface where the clamping points 2011 of the clamping portion 201 are located. This ensures that the upper punch sleeve 30 can be accurately aligned with the lower punch sleeve 20 in three-dimensional space when closed.

[0070] In addition, the limiting portion 301 is also specially designed with an arc portion 40, whose center faces upward, so that when the mold is closed, the arc portion 40 can play a buffering and guiding role, making the contact between the upper punch sleeve 30 and the lower punch sleeve 20 smoother and more evenly stressed, reducing impact and protecting the mold structure from damage.

[0071] In the actual forming operation, the rotor guard ring 50 is inserted into the through groove 101 of the guide column 10, and the lower punch sleeve 20 and the upper punch sleeve 30 are respectively located on both sides of the guard ring. When the upper punch sleeve 30 slides on the guide column 10 to align with the lower punch sleeve 20, the line connecting all the abutment points 3011 and the clamping points 2011 is just perpendicular to the cross section of the rotor guard ring 50, ensuring that the pressure acts vertically on the guard ring to achieve uniform bulging. At the same time, the limiting part 301 and the clamping part 201 are both parallel to the cross section of the rotor guard ring 50, ensuring stability and accuracy during the forming process. Through such a design, the expansion forming mold can effectively improve the forming quality and production efficiency of the rotor guard ring 50.

[0072] In this specification, reference is made to various illustrative embodiments.

[0073] The specific structure described is included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when a structure is described in conjunction with any embodiment, it is claimed that the structure is implemented in conjunction with other embodiments within the scope of the utility model.

Claims

1. An expansion molding die, characterized in that: include: A guide post, wherein a through groove is formed on a side wall of the guide post; A lower punch sleeve, wherein a clamping portion is provided on the inner wall of the lower punch sleeve, and the clamping portion has a plurality of clamping points for clamping the lower punch sleeve to one end of the guide column; An upper punch sleeve, the upper punch sleeve is sleeved on the other end of the guide post, the upper punch sleeve and the guide post are slidably matched, and there is a movable area between the inner wall of the upper punch sleeve and the side wall of the guide post; A plurality of limiting parts are arranged on the inner wall of the upper punch sleeve, the limiting parts are elastically connected to the upper punch sleeve, the limiting parts can extend into the active area, and the limiting parts have a plurality of abutting points for abutting the guide pillars; Wherein, when the limiting portion is in abutment with the guide post, all the abutment points on the limiting portion and all the clamping points on the clamping portion are located on the same plane.

2. An expansion forming mold according to claim 1, characterized in that: The plurality of limiting portions at least include a first limiting portion and a second limiting portion, and along the height direction of the active area, there is a height difference between the first limiting portion and the second limiting portion.

3. An expansion forming die according to claim 2, characterized in that: Projections of the first limiting portion and the second limiting portion in the height direction of the active area have an overlapping portion.

4. An expansion molding die according to claim 3, characterized in that: The first limiting portion and the second limiting portion are parallel.

5. An expansion molding die according to claim 4, characterized in that: several The abutment point is arranged at one end of the limiting portion close to the guide post, and along the height direction of the guide post, a plurality of the abutment points are located in the same plane.

6. An expansion molding die according to claim 5, characterized in that: The limiting portion has an arc portion, which is arranged at the lower side of the plurality of contact points, and the center of the arc portion is located upward.

7. A molding component, characterized in that: include: The expansion molding die according to any one of claims 1 to 6; A rotor guard ring, wherein the rotor guard ring is inserted into the through slot of the guide column, the lower punch sleeve is arranged on one side of the rotor guard ring, and the upper punch sleeve is arranged on the other side of the rotor guard ring; Wherein, when the lower punch sleeve and the upper punch sleeve are aligned, the connecting line of the plurality of abutment points and the plurality of clamping points is perpendicular to the cross section of the rotor guard ring.

8. A molding assembly according to claim 7, characterized in that: The limiting portion and the clamping portion are both parallel to the cross section of the rotor guard ring.

Images