Lightweight aluminum alloy truck hub forging forming device

Abstract

The invention relates to the technical field of hub machining, in particular to a lightweight aluminum alloy truck hub forging forming device which comprises a lower die assembly, an edge die assembly is arranged on the outer side of the lower die assembly, an upper die assembly is arranged above the lower die assembly, and a middle die assembly is arranged in the middle of the upper die assembly. The upper die assembly and the lower die assembly form a spoke forming cavity, and the lower die assembly and the side die assembly form a rim forming cavity. The indicating piece comprises an air channel arranged in the lower die assembly, one end of the air channel communicates with the rim forming cavity, the other end of the air channel is connected with an elastic telescopic piece, and a sliding part is arranged at the end of the elastic telescopic piece; by arranging the indicating piece, when the die is closed, gas in the rim forming cavity can enter the elastic telescopic piece through the gas channel, and gas release is achieved; when the mold is split, the elastic telescopic piece presses the gas into the rim forming cavity again, and the negative pressure suction force of the deep cavity is eliminated; the hub forming quality can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wheel hub processing, and particularly relates to a forging and forming device for lightweight aluminum alloy truck wheel hubs. Background Art

[0002] As a key component of vehicles such as automobiles, the wheel hub plays a crucial role in the vehicle operation system. It not only bears the entire weight of the vehicle, but also has a direct and important impact on the driving performance, safety and comfort of the vehicle.

[0003] Currently, the manufacturing processes of wheel hubs mainly include methods such as casting, forging and spinning. Among them, the forging process is to apply pressure to the metal blank by means of forging machinery to cause it to undergo plastic deformation, and then obtain forgings with specific mechanical properties, shapes and dimensions. During the wheel hub forging process, the metal blank needs to be heated first, and then placed in the forging die. Through the impact or extrusion of the press, the metal blank fully fills the die cavity to form the initial shape of the wheel hub.

[0004] However, there are several problems that need to be solved urgently in the traditional forging process during the production of wheel hubs. In the demoulding process, if the forging is tilted after being ejected from the mould, it will hinder the grasping operation of the robotic arm, thereby affecting the production efficiency of the automated production line. Specifically, the robotic arm usually performs the grasping operation according to the preset program and position information. If the forging is tilted, there is a deviation between its actual position and the preset position, and the robotic arm is difficult to accurately grasp, resulting in the interruption or reduction of the production process.

[0005] Chinese Patent with application number 2021113859808 discloses a demoulding structure applied to an automated precision forging production line for automotive wheel hub bearings, including a lower die base, a demoulding insert block, a ejector rod and a screw rod. There is a die cavity in the lower die base. The demoulding insert block includes an upper boss, a middle disc and a lower slider. The lower slider includes two sliders, and long round holes are opened on the sliders. There is a central channel at the bottom of the lower die base, and two slide ways are arranged in the lower die base. The two sliders extend into the two slide ways, and the upper boss extends into the inner hole at the lower part of the parting surface of the wheel hub bearing forging. The middle disc bears the wheel hub bearing forging. The upper end of the ejector rod passes through the central channel and abuts against the middle disc. Two threaded holes are opened in the lower die base, and each threaded hole is fitted with a screw rod. The free end of each screw rod passes through the lower die base and extends out of the long round hole on the corresponding slider to limit the demoulding insert block. This document avoids the problem that the robot cannot accurately grip due to the tilt of the forging when it is ejected, ensures the stable demoulding of the forging, and improves the production line efficiency.

[0006] Although the technical solutions proposed in the above patent documents have successfully achieved the effect of smooth demoulding of forgings with the help of demoulding inserts, in the actual production application scenarios, there are still significant problems in the upper and lower die clamping links of the existing forming devices.

[0007] When the air in the mold cannot be completely discharged, as the gap between the upper and lower dies gradually narrows, the air inside the mold will be rapidly compressed. This phenomenon will have various adverse effects. On the one hand, the compressed air will exert an additional pressure on the mold. This additional pressure will not only exacerbate the wear of the mold, shorten the service life of the mold, but also cause the mold to bear stresses beyond the design range during the die clamping process, thereby affecting the accuracy and stability of the mold. On the other hand, the compressed gas occupies the cavity space, hindering the normal filling of the metal billet in the cavity, resulting in incomplete metal filling. This seriously affects the appearance quality and internal tissue structure of the forging, and reduces the mechanical properties and service reliability of the forging.

[0008] At the same time, during the demoulding process, if the depth of the mold cavity is relatively deep and the demoulding angle is relatively small, when the hub disengages from the mold cavity, the air inside the cavity will be rapidly evacuated, thus forming a local vacuum. This local vacuum effect will cause the workpiece to be adsorbed on the mold surface and be difficult to disengage. This will not only increase the difficulty and time of demoulding, reduce production efficiency, but also may cause damage to the surface of the hub during the forced demoulding process, affecting the quality and performance of the product. Summary of the Invention

[0009] The purpose of the present invention is to provide a lightweight aluminum alloy truck wheel hub forging forming device to solve the technical problems proposed in the above background technology.

[0010] To achieve the above purpose, the present invention provides the following technical solutions: A lightweight aluminum alloy truck wheel hub forging forming device includes a lower die assembly. An edge die assembly is arranged outside the lower die assembly. An upper die assembly is arranged above the lower die assembly. A middle die assembly is arranged in the middle of the upper die assembly. The upper die assembly and the lower die assembly form a spoke forming cavity, and the lower die assembly and the edge die assembly form a rim forming cavity; An indicating member, which includes an air duct arranged in the lower die assembly. One end of the air duct is communicated with the rim forming cavity, and the other end is connected with an elastic telescopic member. A sliding portion is arranged at the end of the elastic telescopic member; During die clamping, the gas in the rim forming cavity enters the elastic telescopic member through the air duct to realize the release of the gas; during die splitting, the elastic telescopic member presses the gas into the rim forming cavity to eliminate the negative pressure suction force in the deep cavity.

[0011] Preferably, a limiting groove is arranged below the sliding portion, and the limiting groove is used to limit the moving direction of the sliding portion.

[0012] Preferably, a displacement detection unit is provided inside the limit groove, and the displacement detection unit is used to detect the moving distance of the sliding part within a unit time.

[0013] Preferably, the upper die assembly includes: An upper die body, which is located directly above the lower die assembly, and an upper die driving member is provided at the top thereof; A spoke forming part, which is arranged at the bottom of the upper die body and jointly forms a spoke forming cavity with the lower die assembly.

[0014] Preferably, the lower die assembly includes: A first lower die body and a second lower die body, the second lower die body is located on top of the first lower die body, and the diameter of the second lower die body is smaller than that of the first lower die body; A mating part, a mating part that cooperates with the spoke forming part is provided at the top of the second lower die body; When the upper die body and the second lower die body are closed, the mating part and the spoke forming part jointly form a spoke forming cavity.

[0015] Preferably, the side die assembly includes: A side die body, which is located outside the lower die assembly, and a side die driving member is provided at the bottom thereof; A rim forming part and a rim forming part, a rim forming part is provided in the top area of the side die body, and a rim forming part is provided below the rim forming part; When the upper die body and the second lower die body are closed, the rim forming part and the side of the upper die body jointly form a rim forming cavity, and the rim forming part and the outside of the second lower die body jointly form a rim forming cavity.

[0016] Preferably, the air channels are distributed in an array on the outside of the first lower die body and are communicated with the rim forming cavity.

[0017] Preferably, the bottom of the side die body is provided with a plurality of arrayed relief areas, the top of the relief area is lower than the top of the first lower die body, and the sliding part can slide within the relief area.

[0018] Preferably, the middle die assembly includes a middle die body provided in the middle of the lower die assembly, and a middle cover forming part is provided at the top of the middle die body.

[0019] Preferably, the middle die assembly further includes a middle die driving member, and the middle die driving member is used to drive the middle die body to linearly move so that the middle cover forming part extends into the spoke forming cavity.

[0020] The technical effects and advantages of the present invention: 1. This invention connects an air duct to the elastic expansion member. During the mold closing process, the aluminum ingot deforms and squeezes the rim molding cavity, allowing the gas inside the cavity to enter the elastic expansion member through the air duct, achieving effective gas discharge. This design avoids the adverse effects of rapid compression of the gas inside the cavity during mold closing on mold precision and stability, ensuring that the stress experienced by the mold during the closing phase is within the design estimate, guaranteeing mold precision and stability, and thereby improving wheel hub molding quality.

[0021] 2. This invention incorporates a displacement detection unit within the limiting groove to measure the distance the sliding part moves per unit time. During mold closing, this distance is used to determine whether gas discharge is stable, and the expansion and contraction of the upper and side mold drive components are adjusted in real time to prevent premature mold closing, which could affect metal filling and prevent gas from being discharged in time. During mold release, the detection determines whether gas entry is stable. If a clamping phenomenon occurs, the side mold drive components are synchronously controlled to drive the side mold body upward, ensuring smooth demolding of the wheel hub. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic diagram of the working process of the spoke molding of the present invention; Figure 3 This is a schematic diagram of the working process of the wheel rim during molding of the present invention; Figure 4 This is a schematic diagram of the process of demoulding the wheel hub of the present invention; Figure 5 Schematic diagram of the structure of the side mold body of the present invention.

[0023] In the picture: 1. Upper mold assembly; 101. Upper mold body; 102. Spoke forming part; 2. Lower mold assembly; 201. First lower mold body; 202. Second lower mold body; 203. Matching portion; 3. Side mold assembly; 301. Side mold body; 302. Wheel rim forming part; 303. Wheel rim forming part; 4. Middle mold assembly; 401. Middle mold body; 402. Middle cover forming part; 5. Indicator; 501. Airway; 502. Elastic and retractable member; 503. Sliding portion; 6. Give way area. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Example 1

[0025] Refer to Figures 1 to 5 As shown, the present invention provides a lightweight aluminum alloy truck wheel hub forging and forming device, which includes a lower die assembly 2. A side die assembly 3 is arranged outside the lower die assembly 2, and an upper die assembly 1 is arranged above the lower die assembly 2. A middle die assembly 4 is arranged in the middle of the upper die assembly 1. The upper die assembly 1 and the lower die assembly 2 form a spoke forming cavity, and the lower die assembly 2 and the side die assembly 3 form a rim forming cavity. Under the combined action of the upper die assembly 1, the lower die assembly 2, the middle die assembly 4 and the side die assembly 3, the aluminum ingot forms the outer shape of the wheel hub.

[0026] Refer to Figures 1 to 2 As shown, the upper die assembly 1 includes an upper die body 101. A spoke forming part 102 is arranged at the bottom of the upper die body 101. The spoke forming part 102 includes convex blocks distributed in an array. When the upper die body 101 moves downward, the convex blocks at the bottom of the upper die body 101 and the lower die assembly 2 jointly form a spoke forming cavity.

[0027] The upper die body 101 is located directly above the lower die assembly 2, and an upper die driving part is arranged at the top of the upper die body 101; the upper die driving part includes a hydraulic cylinder, and the hydraulic cylinder drives the upper die body 101 to approach or move away from the lower die assembly 2.

[0028] The lower die assembly 2 includes a first lower die body 201 and a second lower die body 202. The second lower die body 202 is located on the top of the first lower die body 201. The diameter of the second lower die body 202 is smaller than that of the first lower die body 201. A matching part 203 matching with the spoke forming part 102 is arranged at the top of the second lower die body 202; when the upper die body 101 and the second lower die body 202 are closed, the matching part 203 and the spoke forming part 102 jointly form a spoke forming cavity.

[0029] The aluminum ingot is placed on the top of the second lower die body 202. When the upper die body 101 and the second lower die body 202 are closed, the matching part 203 and the spoke forming part 102 apply pressure to the aluminum ingot, so that the spoke part of the wheel hub is formed in the spoke forming cavity.

[0030] The side die assembly 3 includes a side die body 301 arranged outside the lower die assembly 2. A side die driving part is arranged at the bottom of the side die body 301; the side die driving part includes hydraulic push cylinders distributed in an array at the bottom of the side die body 301, and the hydraulic cylinders drive the side die body 301 to move up and down outside the lower die assembly 2.

[0031] The rim forming part 302 and the rim forming part 303 are provided. In the top area of the side die body 301, there is a rim forming part 302, and below the rim forming part 302, there is a rim forming part 303. When the upper die body 101 and the second lower die body 202 are closed, the rim forming part 302 and the side of the upper die body 101 together form a rim forming cavity, and the rim forming part 303 and the outside of the second lower die body 202 together form a rim forming cavity.

[0032] The middle die assembly 4 includes a middle die body 401 arranged in the middle of the lower die assembly 2, and a middle cover forming part 402 is provided on the top of the middle die body 401. A middle die driving part is provided at the bottom of the middle die body 401. The middle die driving part includes a hydraulic push cylinder, and the hydraulic push cylinder is used to drive the middle die body 401 to linearly move so that the middle cover forming part 402 extends into the spoke forming cavity.

[0033] During use, the middle die driving part drives the middle die body 401, and then drives the middle cover forming part 402 to move upward until the top of the middle cover forming part 402 is flush with the top of the mating part 203. Subsequently, an aluminum ingot is placed on the top of the second lower die body 202 with the help of an external device (specific reference Figure 1 as shown). At this time, the mating part 203 and the middle cover forming part 402 together provide support for the lower surface of the aluminum ingot.

[0034] The upper die driving part drives the upper die body 101 to move downward, prompting the upper die body 101, the second lower die body 202, and the side die body 301 to perform a die closing operation. During the die closing stage of the three, the spoke forming part 102 of the upper die body 101 and the mating part 203 of the second lower die body 202 cooperate to jointly form a spoke forming cavity; at the same time, the side of the upper die body 101 and the rim forming part 302 of the side die body 301 cooperate with each other to form a rim forming cavity. Under the combined action of the spoke forming cavity and the rim forming cavity, the aluminum ingot is gradually formed into the spoke part of the wheel hub (specific reference Figure 2 as shown).

[0035] It should be particularly noted that during the die closing process of the upper die body 101, the second lower die body 202, and the side die body 301, the side die driving part arranged at the bottom of the side die body 301 will keep the position of the side die body 301 unchanged to ensure that the cavity formed after die closing meets the final shape requirements of the wheel hub.

[0036] After the spoke part is formed, the upper die driving member continues to drive the upper die body 101 to move downward. At the same time, the side die driving member will contract accordingly according to the elongation distance of the upper die driving member, so as to control the synchronous downward movement of the upper die body 101 and the side die body 301. This operation aims to maintain the original shape of the rim part in the rim forming cavity. Since the projected area of the upper die body 101 is larger than that of the mating part 203, under the action of the same clamping pressure, the unit area pressure borne by the lower surface of the aluminum ingot is greater. This pressure difference causes the aluminum ingot to further deform, so as to form a rim part in the rim forming cavity jointly constituted by the rim forming part 303 and the outer side of the second lower die body 202 (specific reference Figure 3 as shown).

[0037] In addition, during the synchronous downward movement of the upper die body 101 and the side die body 301, the middle die driving member will synchronously drive the middle die body 401 to move downward. Finally, the boundary line between the middle cover forming part 402 and the middle die body 401 will completely coincide with the boundary line between the mating part 203 and the second lower die body 202, and the descending distance of the middle die body 401 corresponds to the elongation distance of the upper die driving member.

[0038] When the upper die body 101 and the side die body 301 are lowered to a preset value, the equipment enters the pressure holding stage. After reaching the specified pressure holding time, the upper die driving member drives the upper die body 101 to move upward, and at the same time the middle die driving member drives the middle die body 401 to eject the formed hub. After the hub is ejected, the side die driving member drives the side die body 301 to return to its original state for the next process (specific reference Figure 4 as shown). Embodiment 2

[0039] Although the foregoing embodiments can achieve the forming operation of the hub, in actual application scenarios, if the air inside the mold cannot be completely discharged, when the gap between the upper die body 101 and the second lower die body 202 gradually decreases, the air in the mold will be rapidly compressed. This process will cause the mold to bear stress beyond the design estimate during the mold closing stage, thus having an adverse impact on the accuracy and stability of the mold. In addition, during the demolding process, if the depth of the mold cavity is large and the demolding angle is small, due to the deep cavity negative pressure effect, the workpiece is easily adsorbed on the mold surface, resulting in difficult demolding. In view of this, on the basis of Embodiment 1, technical improvements are made, and the improved technical solutions are as follows: Refer to Figures 1 to 5As shown, the present invention provides a lightweight aluminum alloy truck wheel hub forging device, including an indicator 5, the indicator 5 includes an air channel 501 arranged on the outside of the first lower mold body 201, one end of the air channel 501 is connected to the rim molding cavity formed by the rim molding part 303 and the second lower mold body 202, and the other end of the air channel 501 is connected to an elastic telescopic part 502 arranged at the bottom of the first lower mold body 201, and the end of the elastic telescopic part 502 away from the first lower mold body 201 is connected to a sliding part 503.

[0040] The sliding portion 503 includes a movable block connected to the movable end of the elastic stretch member 502, and a pulley is provided at the bottom of the movable block. The pulley is provided to reduce the friction of the movable block.

[0041] The elastic telescopic member 502 includes an elastic telescopic rod driven by gas. The elastic telescopic member 502 is driven by gas to extend and retract, which belongs to the prior art and will not be described in detail here.

[0042] Reference Figures 1 to 5 As shown, the bottom of the side mold body 301 is provided with an array of distributed clearance areas 6 , the top of the clearance area 6 is lower than the top of the first lower mold body 201 , and the sliding part 503 can slide in the clearance area 6 .

[0043] When using, refer to Figure 1 As shown, before the mold is closed, the elastic member 502 is in a contracted state, and at this time, the end of the sliding portion 503 close to the second lower mold body 202 is located inside the clearance area 6.

[0044] When the upper mold driving member drives the upper mold body 101 to close the mold with the second lower mold body 202 and the side mold body 301, during the process of the upper mold body 101 extruding the aluminum ingot, the deformation of the aluminum ingot squeezes the rim forming cavity, so that the gas in the cavity is discharged through the air channel 501 connected to the rim forming cavity, and the gas enters the interior of the elastic telescopic member 502 through the air channel 501, so that the elastic telescopic member 502 changes from its original contracted state to an extended state, so as to release the gas in the cavity, and avoid the process of the upper mold body 101 extruding the aluminum ingot. The gas in the cavity applies too much additional pressure to the mold, affecting the accuracy and stability of the mold. During the extension of the elastic telescopic member 502, the sliding part 503 is pushed to move. When the aluminum ingot completes the molding of the hub spoke part, the sliding part 503 is close to one end of the second lower mold body 202 and overlaps with the side of the side mold body 301 (for details, refer to Figure 2 shown).

[0045] It should be noted that a channel connected to the air channel 501 may be provided in the second lower mold body 202 , and one end of the channel away from the air channel 501 is distributed on the peripheral side of the middle mold body 401 and is connected to the spoke forming cavity.

[0046] When the spoke part is formed, the upper mold driving member and the side mold driving member respectively drive the upper mold body 101 and the side mold body 301 to move downward synchronously. During the downward movement of the upper mold body 101 and the side mold body 301, the aluminum ingot forms the rim part in the rim forming cavity. At this time, the deformation of the aluminum ingot further squeezes the gas in the rim forming cavity, so that the elastic elastic member 502 is further extended and the sliding part 503 is further displaced (for details, refer to Figure 3 shown).

[0047] After completing the hub forming operation, the upper mold driving component drives the upper mold body 101 to move upward to separate the upper mold body 101 from the spoke forming cavity. Then the middle mold driving component drives the middle mold body 401 to eject the formed hub. During the hub ejection process, the gas stored in the elastic elastic component 502 is filled into the rim forming cavity through the air channel 501 under the influence of the elastic restoring force of the elastic elastic component 502. This avoids the problem that the air inside the cavity will be quickly extracted when the hub is separated from the mold cavity due to the small demoulding angle of the mold, thereby forming a deep cavity negative pressure adsorption phenomenon, causing the workpiece to be adsorbed on the mold surface and difficult to separate (for specific operations, please refer to Figure 4 ). Example 3

[0048] Although the aforementioned embodiment can achieve effective discharge of gas in the chamber, in actual engineering application scenarios, if the mold closing operation speed is too fast, some gas will not be able to escape from the chamber in time, and will accumulate in the chamber. These compressed gases occupy a certain amount of chamber space, hindering the normal filling of the metal blank in the cavity, and ultimately leading to insufficient metal filling. This phenomenon will significantly affect the appearance quality of the forging, destroy the uniformity of its internal structure, and thus reduce the mechanical properties and reliability of the forging. In view of this, technical improvements are made on the basis of Example 2, and the improved technical solution is as follows: Reference Figures 1 to 5 As shown, the present invention provides a lightweight aluminum alloy truck wheel hub forging device, wherein a displacement detection unit is provided inside the limiting groove, and the displacement detection unit is used to detect the moving distance of the sliding part 503 per unit time.

[0049] The displacement detection unit includes a pressure sensing device, which can determine the movement distance of the sliding part 503 per unit time by detecting the expansion and contraction of the elastic expansion member 502 through the pressure sensing device; the displacement detection unit can also be a distance measuring device such as a laser rangefinder.

[0050] A limiting groove is provided below the sliding portion 503 to limit the moving direction of the sliding portion 503. The limiting groove is provided to prevent the sliding portion 503 from moving in the opposite direction and causing deviation, which would affect the detection result of the displacement detection unit.

[0051] When the mold is closed, by detecting the moving distance of the sliding part 503 within a unit time, it is judged whether the gas discharge amount in the rim forming cavity is stable. When it is detected that the moving distance of the sliding part 503 within a unit time is too large, it indicates that the descending rate of the lower mold is too fast, resulting in too large a deformation amount of the aluminum ingot, and thus too much gas is discharged into the elastic telescopic part 502. At this time, the control system adjusts the telescopic amounts of the upper mold driving part and the side mold driving part in real time according to the current moving distance of the sliding part 503 within a unit time to control the deformation amount of the aluminum ingot, ensure that it is in a stable change state, and avoid too fast a mold closing rate, resulting in some gas not being able to enter the elastic telescopic part 502 through the air passage 501 in time, thus occupying the cavity space and causing incomplete metal filling, resulting in defective products.

[0052] When demolding, the middle mold body 401 ejects the hub through the middle cover forming part 402. During this process, by detecting the moving distance of the sliding part 503 within a unit time, it is judged whether the gas entering the rim forming cavity is stable. When it is detected that the moving distance of the sliding part 503 within a unit time is too small, it indicates that the gas is blocked when entering the rim forming cavity, that is, the rim part of the hub has a holding phenomenon with the mold. At this time, the control system synchronously controls the side mold driving part to drive the side mold body 301 to rise, so that the side mold body 301 and the middle mold body 401 apply an upward acting force on the hub synchronously to ensure the smooth demolding of the hub.

[0053] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0054] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lightweight aluminum alloy truck wheel hub forging and forming device, including a lower die assembly (2), characterized in that: A side mold assembly (3) is provided on the outer side of the lower mold assembly (2), an upper mold assembly (1) is provided above the lower mold assembly (2), a middle mold assembly (4) is provided in the middle of the upper mold assembly (1), the upper mold assembly (1) and the lower mold assembly (2) form a spoke molding cavity, and the lower mold assembly (2) and the side mold assembly (3) form a rim molding cavity; An indicator (5) comprising an air channel (501) disposed within the lower mold assembly (2), wherein one end of the air channel (501) is connected to the rim molding cavity, and the other end is connected to an elastic telescopic member (502), wherein the end of the elastic telescopic member (502) is provided with a sliding portion (503); When the mold is closed, the gas in the rim molding cavity enters the elastic telescopic member (502) through the air channel (501), thereby releasing the gas; when the mold is opened, the elastic telescopic member (502) presses the gas into the rim molding cavity, thereby eliminating the negative pressure suction of the deep cavity.

2. The lightweight aluminum alloy truck wheel hub forging and forming device according to claim 1, characterized in that, A limiting groove is provided below the sliding portion (503), and the limiting groove is used to limit the moving direction of the sliding portion (503).

3. The lightweight aluminum alloy truck wheel hub forging and forming device according to claim 2, characterized in that, A displacement detection unit is provided inside the limiting groove, and the displacement detection unit is used to detect the moving distance of the sliding part (503) within a unit time.

4. The lightweight aluminum alloy truck wheel hub forging and forming device according to claim 1, characterized in that, The upper mold assembly (1) comprises: An upper mold body (101) is located directly above the lower mold assembly (2), and an upper mold driving member is provided on the top of the upper mold body; The spoke forming portion (102) is arranged at the bottom of the upper mold body (101) and together with the lower mold assembly (2) forms a spoke forming cavity.

5. The lightweight aluminum alloy truck wheel hub forging and forming device according to claim 4, characterized in that, The lower mold assembly (2) comprises: a first lower mold body (201) and a second lower mold body (202), wherein the second lower mold body (202) is located on top of the first lower mold body (201), and the diameter of the second lower mold body (202) is smaller than the diameter of the first lower mold body (201); A matching portion (203), wherein the top of the second lower mold body (202) is provided with a matching portion (203) that matches the spoke forming portion (102); When the upper mold body (101) and the second lower mold body (202) are closed, the matching portion (203) and the spoke forming portion (102) together form a spoke forming cavity.

6. The lightweight aluminum alloy truck wheel hub forging and forming device according to claim 3, characterized in that, The side mold assembly (3) comprises: A side mold body (301) is located outside the lower mold assembly (2), and a side mold driving member is provided at the bottom thereof; A wheel rim forming portion (302) and a wheel rim forming portion (303), wherein the wheel rim forming portion (302) is provided in the top area of the side mold body (301), and the wheel rim forming portion (303) is provided below the wheel rim forming portion (302); When the upper mold body (101) and the second lower mold body (202) are closed, the rim forming portion (302) and the side of the upper mold body (101) together form a rim forming cavity, and the rim forming portion (303) and the outer side of the second lower mold body (202) together form a rim forming cavity.

7. The lightweight aluminum alloy truck wheel hub forging and forming device according to claim 5, characterized in that, The air channels (501) are arrayed on the outside of the first lower mold body (201) and are connected to the rim molding cavity.

8. The lightweight aluminum alloy truck wheel hub forging and forming device according to claim 6, characterized in that, The bottom of the side mold body (301) is provided with an array of distributed clearance areas (6), the top of the clearance area (6) is lower than the top of the first lower mold body (201), and the sliding part (503) can slide in the clearance area (6).

9. The lightweight aluminum alloy truck wheel hub forging and forming device according to claim 1, characterized in that, The middle mold assembly (4) includes a middle mold body (401) disposed in the middle of the lower mold assembly (2), and a middle cover forming portion (402) is provided at the top of the middle mold body (401).

10. The lightweight aluminum alloy truck wheel hub forging and forming device according to claim 5, characterized in that, The middle mold assembly (4) further includes a middle mold driving member, and the middle mold driving member is used to drive the middle mold body (401) to linearly move so that the middle cover forming portion (402) extends into the spoke forming cavity.

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