A hub forming hot die forging die

Abstract

The application provides a hub forming hot die forging die, which comprises an upper die, a lower surface of the upper die being provided with a first profile surface of a hub upper part to be formed, and a groove structure being arranged on the first profile surface; a lower die assembly being arranged oppositely to the upper die, comprising a lower die body, an upper surface of the lower die body being provided with a convex structure corresponding to the groove structure; a stripping plate, the stripping plate being provided with through holes corresponding to the convex structure, the stripping plate being arranged on the lower die body in a lifting manner, and an upper surface of the stripping plate being provided with a second profile surface of a hub lower part to be formed; and a plurality of split side dies, the split side dies being arranged around the outer periphery of the upper die and the lower die body, and being closed to form a rim forming cavity. The application solves the problems of near-net-shape forming forging of the hub and stripping difficulty during the near-net-shape forming forging of the hub, and effectively improves the material utilization rate during the hub forming process and the mechanical properties of the final product.

Description

Technical Field

[0001] This invention belongs to the field of mold manufacturing technology, and in particular relates to a hot forging mold for wheel hub forming. Background Technology

[0002] Wheel hubs are key load-bearing components in a vehicle's driving system, and their quality directly affects the vehicle's safety and comfort. Currently, high-quality wheel hubs are widely produced using hot forging technology. This process enables the metal material to achieve excellent streamline distribution and mechanical properties, thereby meeting the requirements of wheel hubs under complex operating conditions.

[0003] The forging production of aluminum alloy automotive wheels currently relies mainly on a hot forging + spinning composite process, which suffers from long processes and high equipment costs. Especially in the hot forging stage, the hollowed-out structure of the wheel cannot be directly formed, requiring extensive subsequent machining to remove excess material. This results in large press tonnage requirements, low material utilization, and large machining allowances. Therefore, this invention provides a hot forging die for wheel forming, aiming to achieve direct forging of the hollowed-out area through improved die structure, reducing subsequent processing and lowering press tonnage and production costs. Summary of the Invention

[0004] This invention provides a hot forging die for wheel hub forming, which can at least solve the technical problems that the hollow structure of the wheel hub cannot be directly formed in the hot forging process, and that a large amount of subsequent machining is required to remove the excess material, resulting in a large press tonnage, low material utilization, and large machining allowance.

[0005] The technical solution of this invention is as follows: A hot forging die for wheel hub forming, comprising: The upper mold has a first profile on its lower surface, which is provided with a groove structure on the upper part of the hub to be formed. The lower mold assembly, disposed vertically opposite to the upper mold, includes: The lower mold body has a raised structure corresponding to the groove structure on its upper surface; The groove structure and the protrusion structure are interlocked during mold closing to directly form the hollow area of ​​the wheel hub; The template has through holes corresponding to the protruding structure and is mounted on the lower mold body in a liftable manner. The upper surface of the template has a second profile of the lower part of the hub to be formed. Multiple split-type side molds are arranged around the outer periphery of the upper mold and the lower mold body, and when they are closed, they form a rim forming cavity.

[0006] In one optional embodiment, a mutually cooperating anti-detachment structure is provided between the lower mold body and the split side mold, the anti-detachment structure being used to restrict the split side mold from moving upward relative to the lower mold body.

[0007] In one optional embodiment, the anti-detachment mating structure is a bayonet structure, including a locking protrusion disposed on the outer peripheral surface of the stripping template and a locking groove disposed on the lower inner side of the split side mold, wherein the locking protrusion is engaged in the locking groove.

[0008] In one alternative embodiment, a locking ring is further included, which is elliptically fitted onto the outer periphery of the plurality of split side molds for locking or releasing the split side molds.

[0009] In one alternative embodiment, a cooperating conical surface structure is provided between the locking ring and the split side die for applying radially inward pressure and axially downward pressure to the side die during forging.

[0010] In one optional embodiment, the conical mating structure includes a conical surface disposed on the inner ring of the locking ring and a conical surface disposed on the outer side of the side mold, wherein the conical surface of the locking ring and the conical surface of the side mold are in contact with each other.

[0011] In one alternative embodiment, the taper angle of the conical surface is 3°-15°.

[0012] In one optional embodiment, the lower surface of the upper mold is provided with at least one groove, and the upper surface of the lower mold body is provided with a protrusion corresponding to the groove. The protrusion and the groove are interlocked when the mold is closed, for directly forming the hollow structure of the wheel hub.

[0013] The number of protrusions and grooves is multiple, and they are distributed at intervals along the circumference.

[0014] It also includes a demolding ejector plate, the lower end of which is fixedly connected to the demolding template, and the demolding ejector plate is connected to the ejection drive device.

[0015] The side mold is divided into 2-4 pieces.

[0016] In one optional embodiment, the demolding template is provided with a through hole corresponding to the protrusion structure of the lower mold body. The through hole and the protrusion structure are in clearance fit, which is used to allow the demolding template to move up and down relative to the protrusion structure during demolding.

[0017] In one alternative embodiment, multiple protrusions are provided and are evenly distributed along the circumference of the upper mold; the number of grooves is equal to the number of protrusions and their positions correspond one-to-one.

[0018] In one alternative embodiment, the sidewalls of the protrusion structure and / or the groove structure are vertical surfaces.

[0019] It also includes a heating device disposed inside the upper mold, lower mold body, and / or side mold. The heating device is an electric heating element. It also includes a lubricant spraying device, the nozzle of which is positioned facing the profiles of the upper mold, lower mold body, side mold, and blank surface. This invention solves the problem of direct forming of hollow structures in wheel hubs by interlocking the groove structure of the upper mold assembly with the protrusion structure of the lower mold assembly during mold closing, thus achieving near-net-shape forming of the wheel hub. This invention effectively improves material utilization in the wheel hub forming process and the mechanical properties of the final product.

[0020] The summary section of this invention is provided to present the chosen concepts in a simplified form, which will be further described in the detailed embodiments below. The summary section is not intended to identify essential or necessary features of this disclosure, nor is it intended to limit the scope of this disclosure. Attached Figure Description

[0021] The above and other objects, features and advantages of this disclosure will become more apparent from the accompanying drawings, in which like reference numerals generally denote like parts.

[0022] Figure 1 This is a schematic diagram of the hot forging die structure for wheel hub forming. Figure 2 This is a schematic diagram of the cross-sectional structure of a hot forging die for wheel hub forming. Figure 3 This is a schematic diagram of the upper mold structure.

[0023] Figure 4 This is a structural schematic diagram of the lower mold body.

[0024] Figures 5-11 This is a schematic diagram of the forging process.

[0025] Figure 12 This is a schematic diagram of the final forging.

[0026] Figure label: 1-Upper mold, 2-Lower mold body, 3-Ejection plate, 4-Side mold, 5-Locking ring, 6-Ejection plate, 7-T-slot, 8-T-shaped boss, 9-Mounting base. Detailed Implementation

[0027] Embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0028] The term "comprising" and its variations as used herein signify open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc., may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0029] Please see Figure 1 and Figure 2 As shown, the present invention provides a hot forging die for wheel hub forming, comprising: an upper die 1, a lower die assembly, a lower die body 2, a stripping die 3, and multiple split side dies 4.

[0030] Among them, the upper mold 1 has a first profile on its lower surface, which is provided with a groove structure for the upper part of the hub to be formed; The lower mold assembly, positioned vertically opposite the upper mold 1, includes: The lower mold body 2 has a raised structure on its upper surface that corresponds to the groove structure; the raised structure and the groove structure are interlocked during mold closing to directly form the hollow area of ​​the wheel hub.

[0031] The template 3 has through holes corresponding to the protruding structure and is vertically mounted on the lower mold body 2. Its upper surface is provided with a second profile of the lower part of the hub to be formed.

[0032] Multiple split-type side molds 4 are arranged around the outer periphery of the upper mold 1 and the lower mold body 2, and when they are closed, they form a rim forming cavity. Among them, the stripping template 3 and the split side mold 4 are provided with a mutually cooperating anti-detachment structure, which is used to restrict the split side mold 4 from moving upward relative to the stripping template 3.

[0033] like Figures 1-4 As shown, where Figure 3 This is a schematic diagram of the upper mold 1 structure. Figure 4The diagram shows the structure of the lower mold body 2. The mold provided in this embodiment mainly comprises three core parts: an upper mold 1, a lower mold assembly, and side molds 4. The upper mold 1 is located at the top of the overall mold, and its lower surface has a first profile corresponding to the shape of the upper part of the wheel hub. The lower mold assembly is located directly below the upper mold 1, and is vertically opposite to the upper mold 1. The lower mold assembly further includes a lower mold body 2 and a stripping template 3: the upper surface of the stripping template 3 has a second profile corresponding to the shape of the lower part of the wheel hub; the stripping template 3 is mounted on the upper surface of the lower mold body 2 and can move vertically relative to the lower mold body 2. Multiple split side molds 4 are arranged around the outer periphery of the upper mold 1 and the lower mold body 2. When these side molds 4 are closed, they, together with the upper mold 1 and the lower mold body 2, form a complete wheel rim forming cavity.

[0034] Specifically, an anti-detachment fitting structure is provided between the ejector plate 3 and the side die 4. The function of this structure is that during the forging process, when the upper die 1 presses down on the billet, the billet metal rebounds upward, which will exert an upward force on the side die 4; the anti-detachment fitting structure can effectively limit the upward movement of the side die 4 relative to the ejector plate 3, ensuring that the side die 4 maintains a stable position during the forging process.

[0035] The embodiments of the present invention solve the problem of direct forming of hollow structures in wheel hubs by interlocking the protrusions and grooves during mold closing, thus achieving near-net-shape forming of wheel hubs.

[0036] In one optional embodiment, the anti-detachment mating structure is a bayonet structure, including a locking protrusion disposed on the outer peripheral surface of the stripping template 3 and a locking groove disposed on the lower inner side of the split side mold 4, with the locking protrusion engaging into the locking groove.

[0037] like Figure 2 As shown, one specific implementation of the anti-detachment mating structure is a bayonet structure. Specifically, a locking protrusion is provided on the outer peripheral surface of the ejector plate 3, and a corresponding locking groove is provided at the lower end of the inner side of the side mold 4. During mold closing, the locking groove of the side mold 4 is aligned with the locking protrusion of the ejector plate 3 and engaged, forming a mechanical interlock. This bayonet structure is simple and reliable, and can effectively withstand the upward demolding force on the side mold 4.

[0038] In one alternative embodiment, a locking ring 5 is also included, which is elliptically fitted around the outer periphery of the plurality of split side molds 4 for locking or releasing the split side molds 4.

[0039] like Figures 1-2 As shown, the mold provided in this embodiment of the invention also includes a locking ring 5. The locking ring 5 is an annular component that is vertically and flexibly fitted around the outer periphery of multiple split side molds 4. When the locking ring 5 descends, it applies radially inward pressure to the side molds 4, tightly locking the multiple side molds 4 together; when the locking ring 5 rises, it releases the pressure on the side molds 4, allowing the side molds 4 to open outward for easy demolding.

[0040] The introduction of the locking ring 5 provides a second layer of locking force for the side die 4. During the forging process, the locking ring 5 holds the side die 4 tightly from the outer periphery, forming a double guarantee with the anti-disengagement structure between the lower die body 2 and the side die 4: the anti-disengagement structure mainly prevents the side die 4 from moving upward, while the locking ring 5 mainly prevents the side die 4 from opening outward. The two work together to keep the side die 4 stable during the forging process, ensuring the accuracy of the rim forming cavity.

[0041] In an alternative embodiment, a tapered mating structure is provided between the locking ring 5 and the split side die 4 to apply radially inward pressure and axially downward pressure to the side die 4 during forging.

[0042] like Figure 2 As shown, the locking ring 5 and the side mold 4 adopt a conical surface fit structure. That is, the inner ring of the locking ring 5 is a conical surface, and the outer surface of the side mold 4 is a corresponding conical surface. When the locking ring 5 descends, its inner conical surface and the outer conical surface of the side mold 4 fit together, generating radially inward and axially downward components of force.

[0043] The ingenious aspect of the conical mating structure lies in its use of the inclined plane principle to convert the vertical downward pressure of the locking ring 5 into radial and axial pressure on the side mold 4. The radial pressure prevents the side mold 4 from opening outward, while the axial pressure prevents it from floating upward. This "one pressure, two effects" design allows the locking ring 5 to simultaneously address the outward and upward movement of the side mold 4, resulting in a compact structure and significant effectiveness.

[0044] In one optional embodiment, the conical mating structure includes a conical surface disposed on the inner ring of the locking ring 5 and a conical surface disposed on the outer side of the side mold 4, wherein the conical surface of the locking ring 5 and the conical surface of the side mold 4 are in contact with each other.

[0045] The inner ring of the locking ring 5 is conical, and the outer surface of the side mold 4 is also conical. Their tapers are matched, allowing them to fit together during mold closing. This surface contact fit ensures uniform distribution of locking force, preventing localized stress concentration. Compared to line or point contact, the surface contact between conical surfaces provides a larger contact area, enabling it to withstand greater forging forces while reducing wear on the contact surfaces and extending the mold's service life.

[0046] In one alternative embodiment, the taper angle of the cone surface is 3°-15°.

[0047] The taper angle refers to the angle between the generatrix of the conical surface and the axis. Experiments have shown that a taper angle within the range of 3°-15° provides the best overall performance. If the taper is too small (e.g., less than 5°), the self-locking property is too strong, making demolding difficult; if the taper is too large (e.g., greater than 15°), the radial force generated is insufficient, weakening the radial locking effect.

[0048] This invention limits the taper angle to the range of 3°-15°, ensuring sufficient radial and axial locking force while avoiding excessive self-locking that could lead to demolding difficulties, thus achieving a balance between locking effect and demolding convenience. The selection of this parameter range is an optimal solution derived from extensive experimental data and exhibits significant technical advantages.

[0049] In one alternative embodiment, the lower surface of the upper mold 1 is provided with at least three grooves, and the upper surface of the lower mold body 2 is provided with protrusions corresponding to the protrusions. The protrusions and grooves are interlocked when the mold is closed, for directly forming the hollow structure of the wheel hub.

[0050] like Figures 2-3 As shown, this embodiment of the invention employs a "floral arrangement" mold design. Specifically, the lower surface of the upper mold 1 is provided with a groove, and the upper surface of the lower mold body 2 is provided with a protrusion corresponding to the groove. When the mold is closed, the protrusion of the lower mold 2 is inserted into the groove of the upper mold, and the two are interlocked to directly imprint the hollow structure of the wheel hub (i.e., the gap between the spokes) on the blank. This "protrusion-concave interlocking" shape resembles a flower arrangement, hence the name "floral arrangement".

[0051] In traditional manufacturing processes, the hollow structure of wheel hubs cannot be directly forged; it requires material removal through machining after forging. This invention, using an insert-type mold design, directly forms the hollow structure during forging, achieving near-net-shape forming and significantly reducing subsequent machining. Taking a certain model of wheel hub as an example, the traditional process requires approximately 26 kg of material, with a final product weighing only 8 kg, resulting in low material utilization. Using this invention, material preparation can be reduced to approximately 12 kg, significantly saving material.

[0052] For wheel hubs with multiple hollowed-out areas (such as...) Figure 1 As shown in the finished product drawing, the lower surface of the upper mold 1 is provided with multiple grooves, and the upper surface of the lower mold body 2 is provided with multiple protrusions. These protrusions and grooves are distributed circumferentially and correspond one-to-one with the hollow areas of the wheel hub.

[0053] In this embodiment of the invention, multiple protrusions and grooves are circumferentially spaced, enabling the formation of multiple hollow areas in one step, resulting in high production efficiency.

[0054] In one optional embodiment, the template 3 is provided with a through hole corresponding to the protrusion, and the through hole and the protrusion are in clearance fit.

[0055] The split-type lower die design is intended to solve the demolding problem. In this die, because the raised sidewalls lack draft angles (the sidewalls are vertical), demolding cannot be achieved through conventional ejection methods. This invention employs a split-type lower die, where the ejection plate 3 can rise relative to the lower die body 2, lifting the final forging from the lower die body 2 as a whole, thus achieving reliable demolding without draft angles.

[0056] In one optional embodiment, a demolding ejector plate 6 is further included, the lower end of the demolding template 3 is fixedly connected to the demolding ejector plate 6, and the demolding ejector plate 6 is connected to the ejection drive device for transmission.

[0057] like Figure 1 , Figure 2 As shown, this embodiment of the invention also includes a demolding ejector plate 6. The lower end of the demolding template 3 is fixedly connected to the demolding ejector plate 6, and the demolding ejector plate 6 is connected to an ejection drive device (such as a hydraulic cylinder, pneumatic cylinder, or electric push rod). During demolding, the ejection drive device pushes the demolding ejector plate 6 upward, and the demolding ejector plate 6 drives the demolding template 3 and the final forging placed on it to rise together, realizing overall ejection demolding.

[0058] The introduction of the ejector plate 6 allows for precise control of the lifting and lowering motion of the ejector plate 3 via an external drive device, ensuring a smooth and reliable demolding process. The integral ejection demolding method avoids forging deformation or damage that may occur with traditional ejection methods, making it particularly suitable for complex forging structures without draft angles.

[0059] In one optional embodiment, the side mold 4 is divided into 2-4 pieces. In a preferred embodiment, the side mold 4 is divided into two equal parts. The two side mold pieces 4 are evenly distributed at 180° intervals, and each side mold piece 4 has the same structure, facilitating processing and spare parts management.

[0060] In one alternative embodiment, multiple protrusions are provided and are evenly distributed along the circumference of the lower mold body 1; the number of grooves is equal to the number of protrusions and their positions correspond one-to-one.

[0061] In one alternative embodiment, a mounting base 9 is also included, which is located below the lower mold body 2 and provides support for the lower mold body 2.

[0062] In one optional embodiment, a heating device is further included, which is disposed inside the upper mold 1, the lower mold body 2, and / or the side mold 4. The heating device is an electric heating tube. A lubricant spraying device is also included, with the nozzle of the lubricant spraying device facing the profiles of the upper mold 1, the lower mold body 2, the side mold 4, and the surface of the blank.

[0063] To achieve isothermal forging or control the die temperature, the die of this invention is also equipped with a heating device. The heating device can be located inside the upper die 1, the lower die body 2, and / or the side die 4, for example, by drilling holes inside the die and inserting heating elements. Die heating can significantly improve metal fluidity, reduce deformation resistance, and improve the forming quality of the forging. Simultaneously, heating the die can reduce the temperature drop when the billet contacts the die, which is beneficial for maintaining the billet within the appropriate forging temperature range to complete deformation and avoid cracking or uneven microstructure caused by temperature drop.

[0064] Example 1

[0065] See Figures 5 to 11 The mold in this embodiment includes an upper mold 1, a lower mold body 2, a stripping mold 3, a side mold 4, and a locking ring 5.

[0066] The lower surface of the upper mold 1 has a first profile corresponding to the shape of the upper part of the wheel hub. The upper surface of the ejector plate 3 has a second profile corresponding to the shape of the lower part of the wheel hub. The ejector plate 3 is mounted on the lower mold body 2 and can move up and down relative to the lower mold body 2.

[0067] The side mold 4 is divided into two equal parts, which are arranged around the outer periphery of the upper mold 1 and the lower mold body 2. When the two side molds 4 are closed, they together with the upper mold 1 and the lower mold body 2 form the rim forming cavity.

[0068] The outer periphery of the mold plate 3 is provided with a retaining protrusion 7, and the lower end of the inner side of the side mold 4 is provided with a retaining groove 8 that matches the retaining protrusion 7. When the mold is closed, the retaining protrusion 7 slides into the retaining groove 8 from the side to form a retaining structure.

[0069] The locking ring 5 is fitted around the outer periphery of the two side molds 4. The inner ring of the locking ring 5 is a conical surface, and the outer surface of the side mold 4 is also a conical surface, with a taper angle of 4° for both.

[0070] The lower end of the demolding template 3 is fixedly connected to the demolding ejector plate 6, and the demolding ejector plate 6 is connected to the hydraulic cylinder (not shown in the figure) for transmission.

[0071] Electric heating tubes (not shown in the figure) are embedded inside the upper mold 1, the lower mold body 2, and the side mold 4. Lubricant spraying devices (not shown in the figure) are provided above and to the side of the mold, with the nozzles facing each surface.

[0072] The forging process using the above-mentioned mold is as follows: Step 1: Mold Preparation. Close the two side mold pieces 4 together, lower the locking ring 5, and lock the side mold pieces 4 using the conical surface fit. Turn on the electric heating element to heat the mold to the set temperature. The lubricant spraying device automatically sprays lubricant (the lubricant type is not specifically specified) onto the mold cavity surface.

[0073] The second step is to place the billet. The pre-formed billet is placed on the lower die assembly, and the billet temperature is maintained within the appropriate forging temperature range.

[0074] The third step is pressing down. The upper mold 1 presses down. The blank deforms under the pressure of the upper mold 1, and the metal is extruded upward to fill the rim forming cavity, forming the rim and flange. At the same time, the protrusion of the lower mold body 2 is inserted into the groove of the upper mold 1, directly forming the hollow area on the blank (the blank already has hollow features when it arrives, so it is not imprinted).

[0075] Step 4: Pull out the upper mold. The upper mold 1 rises and is pulled out.

[0076] Fifth step, the locking ring disengages. The locking ring 5 rises, releasing the locking force on the opposite mold 4.

[0077] Step 6: Open the side mold. Side mold 4 opens outward to create space for demolding.

[0078] Step 7, Demolding. The hydraulic cylinder pushes the demolding ejector plate 6 upward, which in turn lifts the demolding template 3. The demolding template 3 then lifts the final forging from the lower mold body 2 as a whole, completing the demolding process. For details, please refer to [link to relevant documentation]. Figure 12 .

[0079] Example 2

[0080] This embodiment is basically the same as Embodiment 1, except that: The taper angle of the conical surface is 8°. It is suitable for applications requiring rapid demolding but with relatively low locking force requirements.

[0081] The side mold is divided into 4 sections. This is suitable for applications requiring a short movement trajectory for the side mold.

[0082] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A hot forging die for wheel hub forming, characterized in that, include: The upper mold has a first profile on its lower surface, which is provided with a groove structure on the upper part of the hub to be formed. The lower mold assembly, disposed vertically opposite to the upper mold, includes: The lower mold body has a raised structure on its upper surface that corresponds to the groove structure; The groove structure and the protrusion structure are interlocked during mold closing to directly form the hollow area of ​​the wheel hub; The template has through holes corresponding to the protruding structure and is mounted on the lower mold body in a liftable manner. The upper surface of the template has a second profile of the lower part of the hub to be formed. Multiple split-type side molds are arranged around the outer periphery of the upper mold and the lower mold body, and when they are closed, they form a rim forming cavity.

2. The hot forging die for wheel hub forming according to claim 1, characterized in that, A mutually cooperating anti-detachment structure is provided between the stripping template and the split side mold, the anti-detachment structure being used to restrict the side mold from moving upward relative to the stripping template.

3. The hot forging die for wheel hub forming according to claim 2, characterized in that, The anti-detachment mating structure is a bayonet structure, including a locking protrusion on the outer peripheral surface of the release template and a locking groove on the lower inner side of the side mold, wherein the locking protrusion is engaged in the locking groove.

4. The hot forging die for wheel hub forming according to claim 2, characterized in that, It also includes a locking ring, which is movably fitted onto the outer periphery of the plurality of split side molds for locking or releasing the split side molds; The locking ring and the split side die are provided with a matching conical surface structure, which is used to apply radially inward pressure and axially downward pressure to the side die during forging.

5. The hot forging die for wheel hub forming according to claim 4, characterized in that, The conical mating structure includes a conical surface disposed on the inner ring of the locking ring and a conical surface disposed on the outer side of the side mold, wherein the conical surface of the locking ring and the conical surface of the side mold are in contact with each other.

6. The hot forging die for wheel hub forming according to claim 5, characterized in that, The taper angle of the cone surface is 3°-15°.

7. The hot forging die for wheel hub forming according to claim 4, characterized in that, The demolding template is provided with through holes corresponding to the protrusions of the lower mold body. The through holes and the protrusions are in clearance fit, which is used to allow the demolding template to move up and down relative to the protrusions during demolding.

8. The hot forging die for wheel hub forming according to claim 1, characterized in that, The sidewalls of the protruding structure and / or the groove structure are vertical surfaces; The protruding structures are provided in multiple ways and are evenly distributed along the circumference of the upper mold; the number of the groove structures is equal to the number of the protruding structures and their positions correspond one-to-one.

9. The hot forging die for wheel hub forming according to claim 1, characterized in that, It also includes a demolding ejector plate, the lower end of which is fixedly connected to the demolding template, and the demolding ejector plate is connected to the ejection drive device.

10. The hot forging die for wheel hub forming according to claim 1, characterized in that, The lower mold body is a split type, and the ejector plate can rise relative to the lower mold body to lift the final forging out of the lower mold body 2 as a whole.

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