Guide wheel rim and radial plate machining process, guide wheel machining process and forging die

Abstract

The invention belongs to the technical field of agricultural machinery part machining, and particularly relates to a guide wheel rim and radial plate machining process, a guide wheel machining process and a forging die. The rim and the spoke plate are subjected to the die forging machining technology, the finished rim tightly wraps and wraps the peripheral plate edge of the spoke plate, on one hand, reliable connection of the rim and the spoke plate can be achieved without welding, mutual separation of the rim and the spoke plate is effectively avoided, on the other hand, the rim and the spoke plate have the large contact area, and rotation of the rim relative to the spoke plate can be limited; therefore, the stability of connection between the guide wheel spoke plate and the rim is ensured. In the machining process, the rim is formed in the forming cavity defined by the upper forging die and the lower forging die, after machining of the rim and the radial plate is completed, production and machining of the guide wheel can be completed by welding and connecting the hub and the radial plate, materials of the rim are saved, and meanwhile the production efficiency is remarkably improved.

Description

Technical Field

[0001] The invention belongs to the technical field of agricultural machinery parts processing, and in particular relates to a guide wheel rim and spoke plate processing technology, a guide wheel processing technology, and a forging die. Background Art

[0002] The applicant's prior application CN115255820A discloses a guide wheel assembly method. In order to overcome the problems of the traditional guide wheel using an integral forging process, a spoke formed by a combination of several petals is used to transitionally connect the hub and the rim, and the spoke is welded to the hub and the rim. The guide wheel does not need to be processed by casting or forging during production, and the processing technology is relatively energy-saving and environmentally friendly. However, when the carbon content of the rim and the spoke is greatly different, the welding strength between the two is difficult to ensure. After long-term use, the connection between the spoke and the rim is prone to loosening or even relative rotation, affecting the reliability of the guide wheel body. Summary of the invention

[0003] The purpose of the present invention is to provide a guide wheel rim and spoke plate processing technology, a guide wheel processing technology, and a forging die, which can effectively improve the reliability of the finished guide wheel body.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is:

[0005] A guide wheel rim and spoke plate processing process, comprising step A and step B.

[0006] A. Material preparation: provide rim blanks and spokes;

[0007] The spoke plate is in the shape of an annular plate, and the middle part is a circular central through hole;

[0008] The rim blank is in a ring shape, and the inner diameter of the rim blank is greater than or equal to the maximum outer diameter of the spoke plate;

[0009] B. Forging: The rim blank and the spoke plate are forged as one piece;

[0010] The finished rim is tightly wrapped around the outer circumferential edge of the spoke.

[0011] A guide wheel processing process using the guide wheel rim and spoke plate processing process, in step A, a wheel hub is also provided, and after the die forging process is completed, the following process is entered:

[0012] C. Welding: Insert the hub into the center through hole of the spoke plate and perform welding.

[0013] A forging die used in the above-mentioned guide wheel rim and spoke plate processing technology comprises a forging upper die and a forging lower die, wherein the forging upper die and the forging lower die enclose a forming cavity which is an annular disc as a whole; the forming cavity comprises an annular plate portion and an annular ring portion, wherein the spacing between the upper and lower cavity walls of the annular plate portion is consistent with the plate thickness of the spoke plate, the inner diameter of the annular plate portion is consistent with that of the spoke plate, and the outer diameter is smaller than the outer diameter of the spoke plate, the inner edge of the annular ring portion is connected to the outer edge of the annular plate portion, and the cavity cross-section of the annular ring portion is a trapezoid with a larger inner portion and a smaller outer portion as a whole, the inner diameter of the annular ring portion is smaller than the inner diameter of the rim blank, and the outer diameter is greater than or equal to the outer diameter of the rim blank.

[0014] Compared with the prior art, the present invention has the following technical effects: the rim and the spoke plate are processed by die forging, and the finished rim tightly wraps and covers the outer peripheral plate edge of the spoke plate. On the one hand, the two can be reliably connected without welding, effectively avoiding the separation of the two. On the other hand, the two have a large contact area, which can limit the rotation of the rim relative to the spoke plate, thereby ensuring the stability of the connection between the guide wheel spoke plate and the rim. During processing, the rim is formed in a forming cavity formed by the forging upper die and the forging lower die. After the processing of the rim and the spoke plate is completed, the production and processing of the guide wheel can be completed by welding the hub and the spoke plate. While saving the rim material, the production efficiency is also significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The following is a brief description of the contents and symbols in the drawings of this specification:

[0016] Figure 1 It is a front view of the present invention;

[0017] Figure 2 yes Figure 1 AA section view in;

[0018] Figure 3 is a front view of the spoke plate in the first embodiment;

[0019] Figure 4 is a front view of the spoke plate in the second embodiment;

[0020] Figure 5 is a front view of the spoke plate in the third embodiment;

[0021] Figure 6 is a front view of the spoke plate in the fourth embodiment;

[0022] Figure 7 It is a half-section schematic diagram of the forging upper die and the forging lower die in the separation position;

[0023] Figure 8 It is a half-section schematic diagram of the forging upper die and the forging lower die in the die closing position;

[0024] Fig. 9 It is a schematic diagram of the radial plate installed in the forging lower die;

[0025] Fig.10 It is a schematic diagram of the installation of the spoke plate and rim blank in the forging lower die;

[0026] Fig.11 yes Fig.10 The enlarged schematic diagram of the middle B part;

[0027] Fig.12 It is a schematic diagram of the forging upper die and the forging lower die after die forging the spoke plate and the rim blank;

[0028] Fig.13 is a front view of the spoke plate in the fifth embodiment;

[0029] Fig.14 is a front view of the spoke plate in the sixth embodiment;

[0030] Fig.15 is a three-dimensional schematic diagram of the spoke plate in the sixth embodiment;

[0031] Fig.16 yes Fig.14 BB section view in;

[0032] Fig.17 is a front view of the spoke plate in Embodiment 7;

[0033] Fig.18 is a three-dimensional schematic diagram of the spoke plate in the seventh embodiment;

[0034] Fig.19 yes Fig.17 CC section view in. DETAILED DESCRIPTION

[0035] The specific implementation of the present invention is further described in detail below through description of embodiments in conjunction with the accompanying drawings.

[0036] A guide wheel rim and spoke plate processing process, comprising the following steps:

[0037] A. Material preparation: Provide rim blank 10a and spoke plate 20. Figure 3-6 As shown, the spoke plate 20 is in the shape of an annular plate as a whole, and the middle of the spoke plate 20 is a central through hole 21 for the hub 30 to pass through. In this embodiment, the central through hole 21 is a circular hole.

[0038] In the preferred embodiment, in order to reduce the deadweight of the guide wheel, a weight-reducing hole 24 is further provided on the plate body of the spoke plate 20. In the embodiment shown in the drawings, the circular weight-reducing holes 24 are arranged at equal angles around the plate core of the spoke plate 20, and the hole cores of the circular weight-reducing holes 24 are cocircular. In other embodiments, the weight-reducing holes 24 may also be selected from common hole shapes such as waist-shaped holes and fan-shaped holes.

[0039] As attached Fig.10 As shown, the rim blank 10a is in the shape of a ring as a whole. The inner diameter of the rim blank 10a needs to be greater than or equal to the maximum outer diameter of the spoke 20, so that the spoke 20 can be inserted into the inner ring of the rim blank 10a along the axial direction of the rim blank 10a for subsequent processing.

[0040] B. Forging: The rim blank 10a and the spoke plate 20 are forged into one piece.

[0041] The rim blank 10 and the spoke plate 20 are placed in the forming cavity of the forging die and processed and connected as a whole. Figure 1 , 2 As shown, the finished rim 10 tightly wraps and covers the outer peripheral plate edge of the spoke plate 20, wherein the outer peripheral plate edge of the spoke plate 20 includes the outer peripheral surface of the spoke plate 20 and the two side plate surfaces adjacent to the outer peripheral surface, that is, the finished rim 10 covers the outer peripheral surface of the spoke plate 20 and the two side plate surfaces adjacent to the outer peripheral surface, a total of three adjacent arrangement surfaces.

[0042] The finished rim 10 and spoke plate 20 obtained by die forging can ensure a stable and reliable connection between the two without welding, which can fundamentally avoid welding quality problems that may be caused by different materials of the two, thereby avoiding guide wheel quality problems caused by welding connection failure in the prior art.

[0043] Specifically, during the die forging process, if Fig. 9 As shown, the spoke plate 20 needs to be placed in the forging die first, and then the rim blank 10a heated to a preset temperature is sleeved on the outer periphery of the spoke plate 20. The forging die maintains the co-centric arrangement of the rim blank 10a and the spoke plate 20 and closes the die, so that the rim blank 10a located in the forming cavity can be forged. The inner ring surface of the finished rim 10 obtained by die forging forms an annular groove that matches the contour of the outer peripheral plate edge of the spoke plate 20. After the finished rim 10 cools to room temperature, it will further shrink and tightly wrap the outer peripheral plate edge of the spoke plate 20, thereby ensuring the reliability and stability of the connection between the two.

[0044] Attached Figure 7 The forging die for forging the guide wheel rim and the spoke plate is shown in a separated position, including an upper forging die 41 and a lower forging die 42. Figure 8 As shown, the forging upper die 41 and the forging lower die 42 enclose a forming cavity 43 which is in the shape of an annular disk as a whole.

[0045] The molding cavity 43 includes an annular plate portion 43a and an annular ring portion 43b. The distance between the upper and lower cavity walls of the annular plate portion 43a is consistent with the plate thickness of the spoke 20. The inner diameter of the annular plate portion 43a is consistent with the spoke 20, and the outer diameter is smaller than the outer diameter of the spoke 20. Fig. 9As shown, a boss 431 is provided in the middle of the forming cavity 43, and the outer contour of the boss 431 coincides with the inner contour of the central through hole 21 of the spoke 20. When the spoke 20 is installed in the forming cavity 43, the boss 431 penetrates and fills the central through hole 21 to achieve accurate positioning of the spoke 20, and the outer peripheral edge of the spoke 20 in the installation position extends to the ring portion 43b in a suspended state.

[0046] The inner edge of the ring portion 43b is connected to the outer edge of the ring plate portion 43a, and the inner diameter of the ring portion 43b is smaller than the inner diameter of the rim blank 10a, and the outer diameter is greater than or equal to the outer diameter of the rim blank 10a. Fig.10 As shown, before the forging upper die 41 and the forging lower die 42 are closed, the inner ring surface of the rim blank 10a is matched with the spoke plate 20, and the outer ring surface is matched with the vertical inner wall surface of the ring portion 43b, and the bottom end surface of the rim blank 10a is lower than the lower plate surface of the spoke plate 20, and there is a cavity below the spoke plate 20 for the rim blank 10a to flow and fill and wrap the edge of the suspended spoke plate 20. Fig.11 As shown, the outer peripheral wall of the cavity ring portion 43b of the forging lower die 42 includes a lower die outer cylindrical wall 421, and the bottom end of the lower die outer cylindrical wall 421 is lower than the lower cavity wall 423 of the cavity ring plate portion 43a of the forging lower die 42, that is, the surface c1 where the bottom surface of the lower cavity wall 423 is located is higher than the surface c2 where the bottom end of the lower die outer cylindrical wall 421 is located, so that it can be ensured that when the spoke plate 20 and the rim blank 10a are installed in the forming cavity 43, the bottom surface of the rim blank 10a is lower than the lower plate surface of the spoke plate 20.

[0047] Furthermore, the outer diameter of the cavity at the bottom of the lower die outer cylindrical wall 421 is reduced, which can prevent the rim blank 10a from further moving downward without external force, so that the bottom of the rim blank 10a is basically flush with the bottom end of the lower die outer cylindrical wall 421, maintaining the installation posture of the rim blank 10a. In addition, in this embodiment, the bottom end of the lower die outer cylindrical wall 421 is higher than 1 / 2 of the cavity depth of the cavity ring portion 43b of the forging lower die 42. Fig.11 As shown, the cavity depth of the ring portion 43b of the forging lower die 42 is h, and the distance between the surface c2 where the bottom end of the lower die outer cylindrical wall 421 is located and the bottom surface of the ring portion 43b of the forging lower die 42 is greater than 0.5h, leaving sufficient space for the flow of the rim blank 10a when the forging upper die 41 and the forging lower die 42 are closed.

[0048] In this embodiment, the cavity cross section of the ring portion 43b is generally trapezoidal in shape with a larger inner portion and a smaller outer portion. Figure 8As shown, the cavity cross section of the ring portion 43b is a trapezoidal shape with a larger portion near the ring core of the ring portion 43b and a smaller portion away from the ring core of the ring portion 43b. In other embodiments, the cross section of the ring portion 43b may also be other shapes, but the axial dimension of the inner end of the ring portion 43b adjacent to the ring core should be larger than the axial dimension of the ring plate portion 43a, and protrude toward the upper and lower sides of the ring plate portion 43a, respectively, to ensure that the rim blank 10a can cover the plate edge of the spoke plate 20 suspended on the ring portion 43b.

[0049] In this embodiment, in the installed state, as shown in the attached Fig.10 As shown, the inner and outer walls of the spoke plate 20 and the rim blank 10a are perpendicular to the axis of the annular plate portion 43a / ring portion 43b, that is, perpendicular to the axis of the boss 431. Therefore, the parting surface 432 of the molding cavity 43 is also perpendicular to the axis of the boss 431.

[0050] The preferred solution is as follows Figure 8 As shown, the parting surface 432 of the molding cavity 43 is located at 1 / 2 of the thickness direction of the molding cavity 43. In order to reliably position the spoke plate 20, the middle part of the cavity of the forging lower die 42 protrudes upward to form a boss 431, and the protruding height of the boss 431 is the plate thickness of the spoke plate 20. In this way, when the forging upper die 41 and the forging lower die 42 are in the enclosed position, the protruding top surface of the boss 431 can be closely fitted with the molding surface of the forging upper die 41. In this way, the boss 431 is used to realize the axial positioning of the forging upper die 41 and the forging lower die 42 in the closed state while realizing the positioning and installation of the spoke plate 20.

[0051] Furthermore, when manufacturing the guide wheel using the above-mentioned rim and spoke structure, it is necessary to provide a hub 30 in an overall tubular shape in the material preparation step, i.e., step A. After the die forging process, i.e., step B is completed, step C, welding, is performed: the hub 30 is inserted into the central through hole 21 of the spoke 20 for welding. Figure 2 As shown, the inner plate edge of the spoke plate 20 is welded to the middle part of the hub 30 in the axial direction to obtain a finished guide wheel. The guide wheel has simple processing steps, good operation and integrity, and its service life is improved.

[0052] In order to further prevent the spoke plate 20 and the rim 10 arranged around the outer circumference of the spoke plate 20 from rotating relative to each other in the finished guide wheel, the outer circumferential plate edge of the spoke plate 20 has a protrusion 22 or a recess 23. The protrusion 22 is arranged in the radial direction or axial direction of the spoke plate 20, and the recess 23 can also be arranged in the radial direction or axial direction of the spoke plate 20. After the die forging process is completed, the rim blank 10a is deformed and tightly wraps the protrusion 22 or fills the recess 23, which can effectively limit the circumferential relative rotation displacement between the finished rim 10 and the spoke plate 20.

[0053] When the protruding direction of the protrusion 22 or the recessed direction of the notch 23 is arranged along the radial direction of the spoke 20, the outer peripheral contour of the spoke 20 will be a non-circular contour. In the preferred embodiment, in order to save materials, after obtaining the circular spoke blank, the spoke blank is cut to have at least one notch 23, so that during the die forging process, the rim blank 10a is deformed and the notch 23 is filled to limit the relative rotation displacement between the rim and the spoke. Of course, the spoke 20 with at least one protrusion 22 can also be directly cut during the processing of the spoke 20.

[0054] Attached Figure 3 In the first embodiment shown, the spoke plate 20 is an integral plate body, which can be formed by stamping a plate in one step. The outer peripheral plate edge of the spoke plate 20 is recessed inward along its radial direction to form two crescent-shaped concave notches 23 as a whole. The two concave notches 23 are symmetrically arranged on both sides of the outer periphery of the spoke plate 20, so that the outer peripheral contour of the spoke plate 20 is elliptical as a whole, as shown in the attached manual. Figure 3 As shown in FIG. 1 , the major axis of the outer contour of the web 20 is a, and the minor axis is b, and a>b.

[0055] Attached Figure 4 In the second embodiment shown, four semicircular notches 23 are provided at equal angles around the outer edge of the spoke 20, so that the outer contour of the spoke 20 is a non-circular contour. In other embodiments, the notches 23 may also be of other shapes, and the number of notches 23 may also be increased or decreased according to demand.

[0056] Attached Figure 5 In the third embodiment shown, a plurality of notches 23 are evenly, continuously and closely arranged around the circumference of the outer peripheral plate edge of the spoke plate 20 so that the outer peripheral edge of the spoke plate 20 is sawtooth-shaped.

[0057] Attached Figure 6 In the fourth embodiment shown, the outer peripheral plate edge of the spoke plate 20 protrudes outward in the radial direction to form a protrusion 22. The protrusion 22 is semicircular in shape as a whole, and four protrusions are arranged at equal angles around the spoke plate 20. In other embodiments, the protrusions 22 may also be of other shapes, and the number of protrusions 22 may be increased or decreased according to demand.

[0058] In order to ensure the anti-rotation effect, the attached Figure 4 , 5 In the embodiment shown in 6, a plurality of protrusions 22 or recesses 23 are arranged at intervals in the circumferential direction of the radial plate 20. In the preferred embodiment, in order to ensure the appearance quality of the finished rim 10, the following Figure 3 As shown in the figure, two crescent-shaped recesses 23 or protrusions 22 are continuously arranged on the outer periphery of the spoke 20, and it is also possible to Figure 3As shown in the figure, only a crescent-shaped concave notch 23 or convex portion 22 is arranged on the outer periphery of the spoke plate 20. In this way, the curvature change rate of the outer periphery of the spoke plate 20 is small, and it cooperates with the ring-shaped rim blank 10a whose inner contour is a cylindrical surface with a diameter a, and can also effectively avoid the appearance quality problems that may be caused by the excessive local distance between the spoke plate 20 and the rim blank 10a during the die forging process. In order to ensure the appearance quality of the guide wheel, as shown in the attached Figure 4 In the second embodiment shown, during die forging, a convex ridge that matches the concave notch 23 can be provided on the inner ring surface of the rim blank 10a. Figure 6 In the fourth embodiment shown, during die forging, a groove matching the protrusion 22 may be provided on the inner ring surface of the rim blank 10 a to ensure the appearance quality of the finished rim 10 .

[0059] Attached Fig.13 In the fifth embodiment shown, the dotted line in the figure is a circle arranged concentrically with the core of the central through hole 21, and the outer peripheral plate edge of the spoke plate 20 is recessed inward along its radial direction to form a crescent-shaped notch 23. In this embodiment, although the outer peripheral contour of the spoke plate 20 can be a perfect circle, the outer peripheral plate edge of the spoke plate 20 is eccentrically arranged with the central through hole 21, and the spoke plate 20 is in an eccentric annular plate shape as a whole. After die forging, the body of the rim 10 of this embodiment is filled with the notch 23, so that the spoke plate 20 and the rim 10 are in an eccentric wheel disc shape as a whole, so that when the wheel disc rotates around its hub 30 tube core, it has a large moment of inertia, thereby improving the stability of the wheel disc's rotation state, reducing the torque between the spoke plate 20 and the rim 10 in the rotation state, and reducing the interaction force between the mating surfaces of the spoke plate 20 and the rim 10, thereby improving the stability of the mating surfaces of the two after long-term use.

[0060] When the outer peripheral edge of the spoke plate 20 is non-circular or the outer peripheral edge of the spoke plate 20 is eccentrically arranged with the central through hole 21, in order to maintain the structure of the outer peripheral contour of the rim 10 and the hub 30 in the finished guide wheel being arranged concentrically, the rim 10 body has a thickness difference in the radial direction of the guide wheel body, and the thickness change point of the rim 10 forms a circumferential limit fit with the outer peripheral edge of the spoke plate 20, thereby effectively preventing the two from rotating relative to each other. In specific implementation, in order to avoid excessive deviation between the center of gravity of the guide wheel 10 and the center of the guide wheel body, which makes the guide wheel's rotational inertia too large, the eccentricity of the eccentric annular spoke plate 20 should not be too large.

[0061] Attached Figure 14-16 In the sixth embodiment shown, the two side surfaces of the spoke plate 20 adjacent to the outer peripheral edge are respectively provided with protrusions 22 extending axially along the spoke plate 20. The protrusions 22 are formed by fixing a columnar element at the outer peripheral edge of the spoke plate 20. Fig.11As shown, the columnar member is inserted through the hole opened on the spoke plate 20, and the columnar member exposed on both sides of the spoke plate 20 is symmetrically arranged on both sides of the plate surface of the spoke plate 20. In other embodiments, the protrusion 22 and the spoke plate 20 can be an integrally formed structure; or two columnar elements can be fixed on the two sides of the plate surface of the spoke plate 20 to form the protrusion 22 respectively. The protrusion 22 can cooperate with the rim 10 to limit the relative rotation of the two.

[0062] Attached Figure 17-19 In the seventh embodiment shown, the two side plate surfaces of the spoke plate 20 adjacent to the outer peripheral edge are respectively provided with through holes formed by being recessed along the axial direction of the spoke plate 20, and the through holes constitute the recess 23. In other embodiments, blind holes may also be provided on the plate surface of the spoke plate 20 adjacent to the outer peripheral edge, and the recess 23 is formed by the blind holes, and the blind holes may be respectively provided on the two side plate surfaces of the spoke plate 20.

[0063] It can be known from the above embodiments that the protrusions 22 or recesses 23 can be arranged one or more around the circumference of the spoke plate 20; when there are multiple protrusions 22 or recesses 23, they can be arranged at intervals or continuously, only protrusions 22 or recesses 23 can be arranged, or protrusions 22 or recesses 23 can be arranged at the outer circumferential plate edge of the same spoke plate 20; protrusions 22 or recesses 23 can be arranged at equal angles around the circumference of the spoke plate 20; protrusions 22 or recesses 23 can be arranged symmetrically around the circumference of the spoke plate 20 or in the thickness direction of the spoke plate 20, or they can be arranged asymmetrically. As long as the protrusions 22 and recesses 23 can cooperate with the rim 10 to limit the relative rotation of the rim 10 and the spoke plate 20 in the circumferential direction, it will be sufficient.

Claims

1. A guide wheel rim and spoke plate processing process, comprising the following steps: A. Material preparation: providing a rim blank (10a) and a spoke plate (20); The spoke plate (20) is in the shape of an annular plate, and has a circular central through hole (21) in the middle; The rim blank (10a) is in a ring shape, and the inner diameter of the rim blank (10a) is greater than or equal to the maximum outer diameter of the spoke plate (20); B. Forging: The rim blank (10a) and the spoke plate (20) are integrally forged by die forging; The finished rim (10) tightly wraps and covers the outer peripheral plate edge of the spoke plate (20).

2. The guide wheel rim and spoke plate processing process according to claim 1, characterized in that: During the die forging process of step B, the heated rim blank (10a) is sleeved on the outer periphery of the spoke plate (20), and the rim blank (10a) and the spoke plate (20) are maintained in a co-centric arrangement posture and die-forged in the forming cavity of the forging die.

3. The guide wheel rim and spoke plate processing process according to claim 1, characterized in that: The outer peripheral plate edge of the spoke plate (20) has a protrusion (22), and the protrusion (22) is arranged in the radial direction and / or axial direction of the spoke plate (20); Or the outer peripheral plate edge of the web (20) has a notch (23), and the recessed direction of the notch (23) is arranged along the radial direction and / or axial direction of the web (20).

4. The guide wheel rim and spoke plate processing process according to claim 1, characterized in that: The plate body of the spoke plate (20) is provided with a weight-reducing hole (24).

5. A process for preparing a guide wheel by using the guide wheel rim and spoke plate processing process according to any one of claims 1 to 4, characterized in that: In step A, a wheel hub (30) is provided. After the die forging process is completed, the following process is performed: C. Welding: insert the hub (30) into the central through hole (21) of the spoke plate (20), and then weld and connect the hub (30) and the spoke plate (20).

6. A forging die for the guide wheel rim and spoke plate processing process according to any one of claims 1 to 4, characterized in that: It comprises a forging upper die (41) and a forging lower die (42), wherein the forging upper die (41) and the forging lower die (42) enclose a forming cavity (43) which is in the shape of an annular disk as a whole; The molding cavity (43) comprises an annular plate portion (43a) and an annular ring portion (43b); the distance between the upper and lower cavity walls of the annular plate portion (43a) is consistent with the plate thickness of the spoke plate (20); the inner diameter of the annular plate portion (43a) is consistent with the spoke plate (20) and the outer diameter is smaller than the outer diameter of the spoke plate (20); the inner edge of the annular ring portion (43b) is connected to the outer edge of the annular plate portion (43a); the inner diameter of the annular ring portion (43b) is smaller than the inner diameter of the rim blank (10a) and the outer diameter is greater than or equal to the outer diameter of the rim blank (10a).

7. The forging die according to claim 6, characterized in that: A boss (431) is provided in the middle of the molding cavity (43), the outer contour of the boss (431) matches the inner contour of the central through hole (21) of the spoke plate (20), and the parting surface (432) of the molding cavity (43) is perpendicular to the axis of the boss (431).

8. The forging die according to claim 7, characterized in that: The parting surface (432) of the molding cavity (43) is located at 1 / 2 of the thickness direction of the molding cavity (43).

9. The forging die according to claim 7, characterized in that: The cavity cross section of the ring portion (43b) is generally in the shape of a trapezoid with a larger inner portion and a smaller outer portion; The outer peripheral wall of the cavity ring portion (43b) of the forging lower die (42) includes a lower die outer cylindrical wall (421), and the outer diameter of the cavity at the bottom of the lower die outer cylindrical wall (421) is reduced; The bottom end of the lower die outer cylindrical wall (421) is lower than the lower cavity wall (423) of the cavity ring plate portion (43a) of the forging lower die (42), and the bottom end of the lower die outer cylindrical wall (421) is higher than 1 / 2 of the cavity depth of the cavity ring portion (43b) of the forging lower die (42).

10. The forging die according to claim 7, characterized in that: The middle part of the cavity of the forging lower die (42) protrudes upward to form a boss (431), and the protruding height of the boss (431) is the plate thickness of the spoke plate (20). When the forging upper die (41) and the forging lower die (42) are in the enclosed position, the protruding top surface of the boss (431) is tightly fitted with the molding surface of the forging upper die (41).

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