Lightweight high-strength hub bearing flange and multi-stage ejection forging method thereof

Abstract

The application discloses a lightweight high-strength hub bearing flange and a multilevel ejection forging processing method thereof, and relates to the technical field.The lightweight high-strength hub bearing flange comprises a hub bearing flange body, an upper die assembly and a lower die assembly.The upper die assembly comprises a precision forging upper die core, a precision forging upper die top yoke, a precision forging upper die module, an ejection base, a first spring, a fixing ring, a top column, a module pressing block, a connecting block, a cushion block, a top rod, a second spring, a supporting block and a precision forging upper die bottom plate.The lower die assembly comprises a precision forging lower die bottom plate, a precision forging lower die top yoke, a top yoke base, a film core base, a precision forging lower die film core and a precision forging lower die module.The lightweight high-strength hub bearing flange increases the height of the precision forging upper die core and the precision forging lower die film core, and reduces the thickness of the intermediate continuous skin, so as to achieve the purpose of lightweight process design, reduce the product material blanking weight, reduce the production material consumption, and thus reduce the cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hub bearing flange, in particular to a lightweight high-strength hub bearing flange and a multi-level ejection forging processing method thereof. BACKGROUND

[0002] The hub bearing is a part applied to the axle of the automobile to bear the load and provide accurate guidance for the rotation of the hub, which bears the axial load and the radial load and is an important component of the automobile load and rotation. The hub bearing includes a flange shaft, an outer ring and an inner ring are arranged on the flange shaft, the flange shaft has two structures of solid and hollow, and the hollow flange shaft is matched with the driving shaft.

[0003] In the prior art, the hub bearing is generally designed with a skin thickness of 15mm to 18mm, which not only increases the weight of the hub bearing, but also increases the load of the hub during use, so that the hub is not easy to install and maintain, and therefore it is necessary to make the hub lightweight while keeping the use strength unchanged. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a lightweight high-strength hub bearing flange and a multi-level ejection forging processing method thereof, which solves the problem of lightweight hub proposed in the background art.

[0005] To achieve the above purpose, the present application realizes the following technical scheme: a lightweight high-strength hub bearing flange and a multi-level ejection forging processing method thereof, which comprises a hub bearing flange body, an upper die assembly and a lower die assembly, the upper die assembly is installed above the hub bearing flange body, the lower die assembly is arranged below the hub bearing flange body, the upper die assembly comprises a precision forging upper die core, a precision forging upper die top fork and a precision forging upper die module, the precision forging upper die core is provided with a precision forging upper die top fork on the side end face, the precision forging upper die top fork is provided with a precision forging upper die module on the side away from the precision forging upper die core, one end of the precision forging upper die core is provided with an ejection base, the outer surface of the ejection base is provided with a first spring, the outer side of the first spring is provided with a fixing ring, the upper side of the fixing ring is provided with a top column, the outer surface of the precision forging upper die module is provided with a module pressing block, the upper side of the precision forging upper die module is provided with a connecting block, the upper side of the connecting block is provided with a pad, one end of the precision forging upper die core is provided with a top rod, the outer surface of the top rod is provided with a second spring, the upper side of the pad is provided with a supporting block, and the upper side of the supporting block is provided with a precision forging upper die bottom plate.

[0006] Optionally, the lower die assembly comprises a precision forging lower die base plate and a precision forging lower die ejector pin, a precision forging lower die ejector pin is longitudinally arranged at the center of the precision forging lower die base plate, a groove is arranged on the upper end surface of the precision forging lower die base plate, a pin base is arranged in the groove, a core base is arranged above the pin base, a precision forging lower die core is arranged at one end of the precision forging lower die ejector pin, and a precision forging lower die module is arranged above the core base.

[0007] Optionally, the hub bearing flange body is in a five-equal-proportion boss structure, five sets of threaded positioning bosses are arranged on the upper end surface of the hub bearing flange body, the five sets of threaded positioning bosses are arranged in a uniform equidistance manner around the center of the hub bearing flange body, reinforcing ribs are arranged on both sides of each of the five sets of threaded positioning bosses, and ten sets of reinforcing ribs are arranged in total, and the skin thickness of the hub bearing flange body is six millimeters.

[0008] Optionally, the three sets of top posts are arranged in a symmetrical and uniform manner around the center of the fixed ring, the top rod and the support block form an up-and-down sliding structure, the top post, the precision forging upper die ejector pin, the precision forging upper die module and the fixed ring form an up-and-down sliding structure, the top rod is returned by the elastic force generated by the second spring, the precision forging upper die ejector pin is returned by the elastic force generated by the second spring, and the top rod, the top post and the precision forging upper die ejector pin are arranged in a clearance fit manner.

[0009] Optionally, the precision forging lower die ejector pin and the precision forging lower die core form an up-and-down sliding structure, the lower die assembly is directly below the upper die assembly, and the center of the lower die assembly and the center of the upper die assembly are on the same vertical line.

[0010] Optionally, five bosses are arranged on the upper end surface of the hub bearing flange body, and the bosses are arranged between the five sets of threaded positioning bosses, the reinforcing ribs are in an arc shape, M threaded holes are longitudinally arranged between the five sets of threaded positioning bosses, and the inner side of the hub bearing flange body is provided with a turning contour line and a forging contour line.

[0011] Optionally, the specific forging process is as follows:

[0012] a) Upsetting, the blank is cut from the round bar steel by a circular saw machine, the cut blank is in a round cake shape, the obtained blank is heated in a heating furnace, the obtained blank is placed in an upsetting die, and then a hot die forging press is used for forging to form an upsetting material;

[0013] b) Pre-forging, through after-heat normalizing and low-temperature tempering, rough turning is performed to obtain a pre-forging flange, the flange is cooled, the flange after rough turning is subjected to S460 and S390 double steel shot peening strengthening treatment in sequence, and the flange hole is processed by a drilling machine, so as to complete the die forging of the flange;

[0014] c) finish forging, after the completion of the die forging, the upper die assembly is ready to complete the return stroke work with the equipment, at this time the ejector rod moves vertically downward, contacts the three groups of ejector posts, and the ejector rod and the three groups of ejector posts continue to move downward, so that the finish forging upper die ejector also vertically moves downward, thereby achieving the effect of smoothly demolding the product, after completing the entire ejection action, the vertical force is removed, the ejector rod returns through the elastic force generated by the second spring, and the finish forging upper die ejector returns through the elastic force generated by the first spring, so that the ejector rod and the ejector post are reset, and the finish forging effect of the hub bearing flange body is completed through the upper die assembly and the lower die assembly.

[0015] The present application provides a lightweight high-strength hub bearing flange and a multi-level ejection forging processing method thereof, which has the following beneficial effects: the lightweight high-strength hub bearing flange increases the height of the finish forging upper die core and the finish forging lower die core, reduces the thickness of the intermediate skin, achieves the purpose of lightweight design of the process, reduces the weight of the product material blank, reduces the consumption of production materials, and thus reduces the cost;

[0016] The lightweight high-strength hub bearing flange first performs lightweight design on the hub bearing flange forging under the premise of ensuring the mechanical properties of tensile strength and yield strength, thins the flange thickness locally, forms a five-equal-tube structure, and performs a drill-free chamfer design on the boss, so that the hub flange and the brake disc form the final assembly, generally a M6 threaded hole is designed to play the role of accurate positioning during assembly, in order to improve the production efficiency of threaded hole machining, five groups of threaded positioning bosses are designed on the forging, so that one threaded positioning boss can be machined at random through a visual sensor during subsequent machining, greatly improving the production efficiency, and the positioning hole height is raised to increase the length of the threaded connection and improve the assembly strength. The hub bearing will be subjected to dynamic load and static load during use, and the main load-bearing component is the flange. The present application increases 10 1mm*1mm reinforcing ribs in view of the above lightweight design, connects the five bosses and five threaded positioning bosses, and smoothly transitions with a circular arc, greatly improving the product strength. The connection design also improves the dynamic balance requirement, achieving a more stable effect during use.

[0017] The light-weight high-strength hub bearing flange reduces the thickness of the intermediate skin by increasing the height of the fine forging upper die core, so as to achieve the purpose of process lightening, the lengthening of the core height increases the difficulty of die demolding in the production process, and because the core is thin, the design of the intermediate ejector rod leads to too thin wall thickness, and the service life of the die is reduced, the present application designs a fork ejection structure, through the design of the ejection end face, increases the contact area, so that the product can be smoothly demolded, at the same time, combining the design of the fine forging upper die core and the fine forging upper die module, a multi-level ejection structure design is invented, through one-time indirect ejection plus one-time direct ejection, two-time simultaneous springback design is designed, through the return stroke of the upper die assembly with the equipment preparation completed, at this time, the ejector rod moves vertically downward, contacts three groups of ejector rods, the ejector rod and the three groups of ejector rods continue to move downward, so that the fine forging upper die fork also moves vertically downward, thereby achieving the effect of smoothly demolding the product, after completing the entire ejection action, the force in the vertical direction is removed, the ejector rod returns through the elastic force generated by the second spring, the fine forging upper die fork returns through the elastic force generated by the first spring, so that the ejector rod and the ejector rod are reset, and the fine forging of the hub bearing flange body is completed through the upper die assembly and the lower die assembly. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a front view structural diagram of the present application;

[0019] Figure 2 It is a front view structural diagram of the present application;

[0020] Figure 3 It is a front view structural diagram of the present application;

[0021] Figure 4 It is a front view structural diagram of the present application Figure 2 It is a front view structural diagram of the present application

[0022] Figure 5 It is a front view structural diagram of the present application Figure 3 It is a front view structural diagram of the present application

[0023] Figure 6 It is a front view structural diagram of the present application

[0024] Figure 7 It is a front view structural diagram of the present application

[0025] In the figure: 1, hub bearing flange body; 101, threaded positioning boss; 102, reinforcing rib; 103, turning profile line; 104, forging profile line; 2, upper die assembly; 201, fine forging upper die core; 202, fine forging upper die ejector pin; 203, fine forging upper die module; 204, ejector base; 205, first spring; 206, fixing ring; 207, ejector post; 208, module pressing block; 209, connecting block; 2010, cushion block; 2011, ejector rod; 2012, second spring; 2013, support block; 2014, fine forging upper die bottom plate; 3, lower die assembly; 301, fine forging lower die bottom plate; 302, ejector pin base; 303, fine forging lower die ejector pin; 304, core base; 305, fine forging lower die core; 306, fine forging lower die module. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0027] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] Please refer to Figures 1 to 7The application provides a technical scheme: a lightweight high-strength hub bearing flange and a multi-level ejection forging processing method thereof, which comprises a hub bearing flange body 1, an upper die assembly 2 and a lower die assembly 3. The upper die assembly 2 is installed above the hub bearing flange body 1, and the lower die assembly 3 is arranged below the hub bearing flange body 1. The upper die assembly 2 comprises a precision forging upper die core 201, a precision forging upper die ejector 202 and a precision forging upper die module 203. The precision forging upper die ejector 202 is installed on the side end face of the precision forging upper die core 201. The precision forging upper die module 203 is arranged on the side, away from the precision forging upper die core 201, of the precision forging upper die ejector 202. The precision forging upper die core 201 is provided with an ejection base 204 at one end, and the outer surface of the ejection base 204 is provided with a first spring 205. The outer side of the first spring 205 is provided with a fixing ring 206, and the upper side of the fixing ring 206 is provided with a jacking post 207. The outer surface of the precision forging upper die module 203 is installed with a module pressing block 208, and the upper side of the precision forging upper die module 203 is provided with a connecting block 209. The upper side of the connecting block 209 is installed with a pad 2010. The precision forging upper die core 201 is provided with a jacking rod 2011 at one end, and the outer surface of the jacking rod 2011 is provided with a second spring 2012. The upper side of the pad 2010 is installed with a supporting block 2013, and the upper side of the supporting block 2013 is installed with a precision forging upper die bottom plate 2014. The jacking post 207 is provided with three groups, and the three groups of jacking posts 207 are uniformly arranged in the center of the fixing ring 206 in a symmetrical manner. The jacking rod 2011 and the supporting block 2013 form an up-down sliding structure, the jacking post 207 and the precision forging upper die ejector 202 form an up-down sliding structure with the precision forging upper die module 203 and the fixing ring 206, and the jacking rod 2011, the jacking post 207 and the precision forging upper die ejector 202 are arranged in a clearance fit.

[0030] The lower die assembly 3 comprises a precision forging lower die base plate 301 and a precision forging lower die ejector pin 303, the precision forging lower die base plate 301 is longitudinally provided with the precision forging lower die ejector pin 303 at the center, and the upper end surface of the precision forging lower die base plate 301 is provided with a groove, the inside of the groove is provided with an ejector pin base 302, and the upper side of the ejector pin base 302 is provided with a film core base 304, one end of the precision forging lower die ejector pin 303 is provided with a precision forging lower die film core 305, the upper side of the film core base 304 is provided with a precision forging lower die module 306, the precision forging lower die ejector pin 303 and the precision forging lower die film core 305 constitute an up-down sliding structure, the lower die assembly 3 is directly below the upper die assembly 2, and the center of the lower die assembly 3 and the center of the upper die assembly 2 are on the same vertical line, the thickness of the intermediate flash is reduced by increasing the height of the precision forging upper die film core 201, so as to achieve the purpose of process lightening, the lengthening of the height of the film core will increase the difficulty of mold demolding in the production process, and because the film core is thin, the design of the intermediate ejector pin 2011 will cause the wall thickness to be too thin, and the service life of the mold is reduced, the present application designs an ejector pin ejection structure, through the design of the ejection end face, the contact area is increased, so that the product can be smoothly demolded, and combined with the design of the precision forging upper die film core 201 and the module, a multi-level ejection structure design is invented, through one-time indirect ejection plus one-time direct ejection, two-time simultaneous springback design is designed, through the return stroke of the upper die assembly 2 with the equipment ready to complete the return stroke, at this time, the ejector pin 2011 moves vertically downward, contacts three groups of ejector pins 207, the ejector pin 2011 and the three groups of ejector pins 207 continue to move downward, so that the precision forging upper die ejector pin 202 also moves vertically downward, thereby achieving the effect of smoothly demolding the product, after completing the entire ejection action, the force in the vertical direction is removed, the ejector pin 2011 returns through the elastic force generated by the second spring 2012, the precision forging upper die ejector pin 202 returns through the elastic force generated by the first spring 205, so that the ejector pin 2011 and the ejector pin 207 are reset, and the upper die assembly 2 and the lower die assembly 3 complete the precision forging effect on the hub bearing flange body 1;

[0031] The hub bearing flange body 1 is in five-equal-proportion boss structure, and the upper end face of the hub bearing flange body 1 is provided with five groups of threaded positioning bosses 101, which are arranged in equal distance around the center of the hub bearing flange body 1, and the two sides of each threaded positioning boss 101 is provided with a reinforcing rib 102, and ten groups of reinforcing ribs 102 are arranged in total, the skin thickness of the hub bearing flange body 1 is six millimeters, the upper end face of the hub bearing flange body 1 is provided with five groups of bosses, and the bosses are arranged between the five groups of threaded positioning bosses 101, the reinforcing rib 102 is in arc shape, M6 threaded holes are longitudinally arranged between the five groups of threaded positioning bosses 101, and the inner side of the hub bearing flange body 1 is provided with a turning contour line 103 and a forging contour line 104, firstly, under the premise of ensuring the mechanical properties of the product such as tensile strength and yield strength, the hub bearing flange forging is designed to be lightweight, the thickness of the flange is locally thinned to form a five-equal-proportion boss structure, and the boss is designed to be free of drilling and chamfering, the hub flange is finally assembled with the brake disc, generally, an M6 threaded hole is designed to enable accurate positioning during assembly, in order to improve the production efficiency of threaded hole machining, five groups of threaded positioning bosses 101 are designed on the forging, so that one threaded positioning boss 101 can be randomly selected for machining through a visual sensor during subsequent machining, thereby greatly improving the production efficiency, and the height of the positioning hole is increased to increase the length of the threaded connection and improve the assembly strength, the hub bearing is subjected to dynamic load and static load during use, and the main load-bearing component is the flange, the present application increases 10 reinforcing ribs 102 with a size of 1mm*1mm for the above lightweight design, connects the five bosses and the five groups of threaded positioning bosses 101, and uses a circular arc to smoothly transition, thereby greatly improving the strength of the product and the dynamic balance requirement of the connection, and achieving more stable effect during use.

[0032] The specific multi-level ejection forging process is as follows:

[0033] a) Upsetting, the blank is cut from the round bar steel by a circular saw machine, the cut blank is in a round cake shape, the obtained blank is placed in a heating furnace for heating, and then the blank is placed in an upsetting die, and then a hot die forging press is used for forging to form an upsetting material;

[0034] b) Pre-forging, through after-heating normalizing and low-temperature tempering, rough turning is performed to obtain a pre-forging flange, the flange is cooled, and the flange after rough turning is subjected to S460 and S390 double steel shot peening strengthening treatment, and then a drilling machine is used to process the flange hole to complete the die forging of the flange;

[0035] c) finish forging, after the completion of the die forging, the upper die assembly 2 is ready to complete the return stroke, at this time the ejector rod 2011 moves vertically downward, contacts the three sets of ejector posts 207, the ejector rod 2011 and the three sets of ejector posts 207 continue to move downward, so that the finish forging upper die ejector yoke 202 also moves vertically downward, thereby achieving the effect of smoothly demolding the product, after the completion of the entire ejection action, the vertical force is removed, the ejector rod 2011 returns through the elastic force generated by the second spring 2012, the finish forging upper die ejector yoke 202 returns through the elastic force generated by the first spring 205, so that the ejector rod 2011 and the ejector posts 207 are reset, and the finish forging effect of the hub bearing flange body 1 is completed through the upper die assembly 2 and the lower die assembly 3.

[0036] In summary, the lightweight high-strength hub bearing flange first guarantees the mechanical properties of the product tensile strength, yield strength, and then lightweight design of the hub bearing flange forging, locally thinning the flange thickness, forming a five-equal boss structure, and at the same time, the boss is designed without drilling and chamfering. The hub flange and the brake disc form the final assembly, and a M6 threaded hole is generally designed to enable accurate positioning during assembly. In order to improve the production efficiency of threaded hole machining, the invention designs five sets of threaded positioning bosses 101 on the forging, which can be machined by randomly selecting one threaded positioning boss 101 through a visual sensor during subsequent machining, greatly improving production efficiency. At the same time, the height of the positioning hole is raised, the length of the threaded connection is increased, the assembly strength is improved, and the hub bearing will be subjected to dynamic load and static load during use. The main load-bearing component is the flange. The invention adds 10 1mm*1mm reinforcing ribs 102 to the above lightweight design to connect the five bosses and five threaded positioning bosses 101, and at the same time, it is smoothly transitioned with a circular arc, greatly improving the strength of the product. The design of the connection also improves the dynamic balance requirement, achieving a more stable effect during use. By increasing the height of the precision forging upper die core 201, the thickness of the intermediate skin is thinned to achieve the purpose of process lightweight. The lengthening of the die core increases the difficulty of die demolding during production. Because the die core is thin, the design of the intermediate ejector rod 2011 will result in too thin wall thickness, reducing the service life of the die. The invention designs a fork ejector structure, which increases the contact area through the design of the ejector end face, enabling the product to be smoothly demolded. At the same time, in combination with the design of the precision forging upper die core 201 and the die block, a multi-level ejection structure design is invented. Through indirect ejection once and direct ejection once, two simultaneous springback designs are designed. The upper die assembly 2 completes the return stroke with the equipment, at which time the ejector rod 2011 moves vertically downward and contacts the three sets of ejector posts 207. The ejector rod 2011 and the three sets of ejector posts 207 continue to move downward, causing the precision forging upper die fork 202 to also move vertically downward, thereby achieving the effect of smoothly demolding the product. After completing the entire ejection action, the vertical force is removed, the ejector rod 2011 returns through the elastic force generated by the second spring 2012, and the precision forging upper die fork 202 returns through the elastic force generated by the first spring 205, thereby resetting the ejector rod 2011 and the ejector posts 207. The upper die assembly 2 and the lower die assembly 3 complete the precision forging effect of the hub bearing flange body 1.

[0037] The specific production process is as follows:

[0038] a) Upsetting, sawing the bar material The embryo material is cut from the round bar steel using a circular saw machine, and the cut embryo material is in the form of a round cake. The obtained embryo material is placed in a heating furnace for heating, and then placed in an upsetting die, and then forged by a hot die forging press to form an upsetting material;

[0039] b) pre-forging, by means of afterglow normalizing, low temperature tempering, rough turning, obtaining pre-broken flange, cooling flange, S460 and S390 double steel shot peening strengthening treatment on flange after rough turning, drilling flange hole by drill press, so as to complete flange die forging;

[0040] c) finish forging, after completing die forging, the upper die assembly 2 is ready to complete the return stroke, at this time the ejector rod 2011 moves vertically downward, contacts the three groups of ejector posts 207, the ejector rod 2011 and the three groups of ejector posts 207 continue to move downward, the finish forging upper die ejector yoke 202 also moves vertically downward, so as to achieve the effect of smooth demolding of the product, after completing the entire ejecting action, the force in the vertical direction is removed, the ejector rod 2011 returns by the elastic force generated by the second spring 2012, the finish forging upper die ejector yoke 202 returns by the elastic force generated by the first spring 205, so as to reset the ejector rod 2011 and the ejector posts 207, and the upper die assembly 2 and the lower die assembly 3 complete the finish forging effect of the hub bearing flange body 1.

Claims

1. A multi-stage ejection forging die for a lightweight, high-strength wheel hub bearing flange, comprising a wheel hub bearing flange body (1), an upper die assembly (2), and a lower die assembly (3), characterized in that: The upper mold assembly (2) is installed above the wheel hub bearing flange body (1), and the lower mold assembly (3) is provided below the wheel hub bearing flange body (1). The upper mold assembly (2) includes a precision forging upper mold core (201), a precision forging upper mold top fork (202), and a precision forging upper mold module (203). The precision forging upper mold core (201) is equipped with a precision forging upper mold top fork (202) on its side end face, and a precision forging upper mold module is provided on the side of the precision forging upper mold top fork (202) away from the precision forging upper mold core (201). 203), one end of the precision forging upper die core (201) is provided with an ejector base (204), and the outer surface of the ejector base (204) is provided with a first spring (205), the outer side of the first spring (205) is provided with a fixing ring (206), and the top post (207) is provided above the fixing ring (206). The outer surface of the precision forging upper die module (203) is equipped with a module pressure block (208), and the top of the precision forging upper die module (203) is provided with a connecting block (209). A pad (2010) is installed above the die core (201) of the precision forging upper die. A push rod (2011) is provided at one end of the die core (201), and a second spring (2012) is provided on the outer surface of the push rod (2011). A support block (2013) is installed above the pad (2010), and a precision forging upper die base plate (2014) is installed above the support block (2013). Three sets of push columns (207) are provided, and the three sets of push columns (207) are symmetrically and evenly arranged around the center of the fixing ring (206). The push rod (2010) is installed on the upper die core (201) of the precision forging upper die. 11) It forms an up-and-down sliding structure with the support block (2013). The top column (207) and the precision forging upper die top fork (202) form an up-and-down sliding structure with the precision forging upper die module (203) and the fixing ring (206). The top rod (2011) returns through the elastic force generated by the second spring (2012). The precision forging upper die top fork (202) returns through the elastic force generated by the first spring (205). The top rod (2011), the top column (207) and the precision forging upper die top fork (202) are arranged with a clearance fit.

2. The multi-stage ejection forging die for the lightweight high-strength wheel hub bearing flange according to claim 1, characterized in that: The lower die assembly (3) includes a precision forging lower die base plate (301) and a precision forging lower die top fork (303). The precision forging lower die base plate (301) is longitudinally provided with a precision forging lower die top fork (303) at the center. The upper end face of the precision forging lower die base plate (301) is provided with a groove. A top fork base (302) is installed inside the groove. A die core base (304) is provided above the top fork base (302). A precision forging lower die core (305) is provided at one end of the precision forging lower die top fork (303). A precision forging lower die module (306) is provided above the die core base (304).

3. The multi-stage ejection forging die for the lightweight high-strength wheel hub bearing flange according to claim 1, characterized in that: The hub bearing flange body (1) has a five-part boss structure, and the upper end face of the hub bearing flange body (1) is provided with five sets of threaded positioning bosses (101). The five sets of threaded positioning bosses (101) are evenly and equidistantly arranged around the center of the hub bearing flange body (1). Reinforcing ribs (102) are provided on both sides of the five sets of threaded positioning bosses (101), and a total of ten sets of reinforcing ribs (102) are installed. The thickness of the hub bearing flange body (1) is six millimeters.

4. The multi-stage ejection forging die for the lightweight high-strength wheel hub bearing flange according to claim 2, characterized in that: The precision forging lower die top fork (303) and the precision forging lower die core (305) form an up-and-down sliding structure. The lower die assembly (3) is located directly below the upper die assembly (2), and the center of the lower die assembly (3) and the center of the upper die assembly (2) are on the same vertical line.

5. The multi-stage ejection forging die for a lightweight, high-strength wheel hub bearing flange according to claim 3, characterized in that: The upper end face of the wheel hub bearing flange body (1) is provided with five sets of bosses, and the bosses are all installed between the five sets of threaded positioning bosses (101). The reinforcing rib (102) is specifically arc-shaped. The five sets of threaded positioning bosses (101) are longitudinally drilled with M6 threaded holes. The inner side of the wheel hub bearing flange body (1) is provided with machining contour lines (103) and forging contour lines (104).

6. The forging method of the multi-stage ejection forging die for the lightweight high-strength wheel hub bearing flange according to any one of claims 1 to 5, characterized in that: The specific forging process is as follows: a) Upsetting: The billet is cut from the round steel bar using a circular saw. The cut billet is in the shape of a round disc. The obtained billet is heated in a heating furnace and then placed in an upsetting die. It is then forged using a hot forging press to form the upsetting material. b) Pre-forging: Through residual heat normalizing and low temperature tempering, rough turning is performed to obtain a pre-forged flange. After cooling, the flange after rough turning is subjected to double shot peening treatment with S460 and S390 steel shot. Then, the flange hole is machined using a drilling machine to complete the flange die forging. c) Precision forging: After the die forging is completed, the upper die assembly (2) completes the return stroke as the equipment prepares. At this time, the ejector rod (2011) moves vertically downward and contacts the three sets of ejector pins (207). The ejector rod (2011) and the three sets of ejector pins (207) continue to move downward, causing the precision forging upper die ejector fork (202) to also move vertically downward, thereby achieving the effect of smooth demolding of the product. After the entire ejection action is completed, the vertical force is removed, and the ejector rod (2011) returns through the elastic force generated by the second spring (2012). The precision forging upper die ejector fork (202) returns through the elastic force generated by the first spring (205), thereby resetting the ejector rod (2011) and ejector pins (207). The effect of precision forging of the wheel hub bearing flange body (1) is completed through the upper die assembly (2) and the lower die assembly (3).

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