A device for press forming of automobile wheel hub

Abstract

This invention discloses an automotive wheel hub pressing and forming device, relating to the field of automotive wheel hub manufacturing technology. It includes a hydraulic press, an upper die positioned at one end of the hydraulic press's hydraulic push rod to deform a steel rim by downward pressure, and a lower die positioned on the hydraulic press table to cooperate with the upper die in deforming the lower end of the steel rim by pressure. It also includes an inner support assembly that moves through the middle of the lower die and is deformed by the upper die, thus filling the interior of the steel rim for pre-flexible centering. The flexible centering support method used in this invention causes minimal damage to the steel rim, and the contact area between the outer and inner support water strips and the steel rim is more sufficient, resulting in more balanced stress on the steel rim and improving the yield rate of finished products. This invention is applicable to steel rims of various sizes; the adaptive changes in the inner and outer support water strips, the first elastic spiral ring, and the second elastic spiral ring can achieve support and centering for steel rims of different sizes.

Description

Technical Field

[0001] This invention relates to the field of automobile wheel manufacturing technology, specifically to an automobile wheel pressing and forming apparatus. Background Technology

[0002] In modern transportation, automobiles, as the most common and crucial means of transportation, have always been a focus of attention regarding their performance and safety. As a key component of a car, the wheel hub plays an irreplaceable role not only in supporting the vehicle's weight and transmitting power and braking force, but also significantly impacts the car's handling, comfort, and aesthetics. A car wheel hub typically consists of two main parts: the rim and the spokes. The rim is the part of the rim where the tire is mounted. It directly contacts the tire and needs to possess good strength and sealing properties to ensure the tire can be stably mounted on the rim and withstand various pressures and impacts during vehicle operation. The spokes connect the rim and the center of the rim, serving to support the rim and transmit torque.

[0003] In the manufacturing of automobile wheel rims, the cut sheet metal is first bent using a bending machine to initially form a ring. Then, the joints of the bent sheet metal are welded together to form a complete ring-shaped wheel rim blank, commonly known as a "steel rim". Finally, a flaring hydraulic press is used to flare both ends of the steel rim to enhance its strength and sealing, preventing the tire from falling off during driving. During the flaring process, workers place the steel rim directly onto the lower die of the flaring hydraulic press and use the hydraulic rod of the press to push the upper die. The pressure from the upper and lower dies widens both ends of the steel rim. In this process, although the steel rim may initially tilt at a certain angle due to the direct placement by hand, the downward pressure of the upper die will force the steel rim to straighten and keep it in a vertical position.

[0004] By forcibly straightening the rim by pressing down with the upper die, the final flaring process is likely to be completed successfully. However, there is still a risk that the rim may tilt beyond the limit, and the forced pressing of the upper die, combined with the increasingly tight fit between the rim and the lower die, could cause uneven stress on the rim, leading to abnormal deformation or even damage. Furthermore, during the flaring process, because the inner and outer walls of the rim are unsupported, stress concentration at micro-cracks that meet production standards will become more pronounced. This could cause the cracks to expand further, forming visible cracks, or resulting in localized bulges or depressions, leading to uneven rim surface finish. Flatness reduces the pass rate of finished products. Currently, some rigid, fixed-size point-contact expansion plates are used in the market to support and center the steel ring. However, on the one hand, the rigid material of the point-contact expansion plate will inevitably cause damage to the steel ring. The expansion of the point-contact expansion plate will also apply more uneven force to the steel ring, causing stress imbalance. On the other hand, the size of the point-contact expansion plate is fixed. When the length of the steel ring changes, the point-contact expansion plate will lose its support for the upper part of the longer steel ring. As a result, the stress at the upper part of the steel ring will be unequal to the stress at the part supported by the expansion plate, increasing the probability of defects in the finished steel ring.

[0005] To address the aforementioned issues, there is an urgent need for innovative design based on the existing automotive wheel hub pressing and forming equipment. Summary of the Invention

[0006] The present invention addresses the problem of overly simplistic solutions in existing technologies by providing a significantly different solution. Specifically, the present invention aims to provide an automotive wheel hub pressing and forming device to solve the risk of uneven stress in the wheel hub caused by uneven stress in the lower mold due to the upper mold forcing the wheel hub to become increasingly tight when the tilt angle exceeds a certain value, resulting in abnormal deformation or even damage.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an automobile wheel hub pressing and forming device, comprising a hydraulic press, an upper mold disposed at one end of the hydraulic push rod of the hydraulic press to deform the steel ring by pressing it downward, and a lower mold disposed on the hydraulic press table to cooperate with the upper mold to deform the lower end of the steel ring by pressing it; further comprising an inner support component that is movable through the middle of the lower mold and deformed by being pressed by the upper mold to fill the interior of the steel ring and pre-flexibly center the steel ring; an outer support component that is movable on the hydraulic press table and deformed by being pulled upward by the lower movement of the inner support component to wrap around the outside of the steel ring and pre-support the steel ring; and a water control component that expands the outer support component by injecting water simultaneously when the inner support component is pressed down and then flexibly positions the steel ring by pressing it against the outer wall of the steel ring.

[0008] The inner support assembly includes a limiting rod that moves through the center of the lower mold, a first elastic spiral ring that moves around the upper end of the limiting rod, and an inner support water belt that moves along the spiral trajectory of the first elastic spiral ring and moves around the outside of the first elastic spiral ring.

[0009] The external support assembly includes a second elastic spiral ring movably disposed above the hydraulic press table and an external support water belt sleeved around the outside of the second elastic spiral ring along the spiral trajectory of the second elastic spiral ring;

[0010] The water control assembly includes water pipes symmetrically distributed on both sides inside the hydraulic press and a pressure plate fixedly sleeved on the outer wall of the limit rod.

[0011] Preferably, the inner support assembly further includes a first positioning plate fixed to the top of the limiting rod, a second positioning plate fixedly sleeved on the outer surface of the limiting rod, and a return spring fixed on the bottom surface of the second positioning plate. A fixing plate is fixed to the bottom end of the return spring, and the return spring is movably sleeved on the outside of the limiting rod.

[0012] The lower end of the hydraulic press has a cavity, and the fixing plate divides the cavity into upper and lower parts. The fixing plate is fixed to the inner wall of the cavity and is seamlessly connected. The fixing plate is located directly above the water pressure plate.

[0013] The top ends of the inner support water hose and the first elastic spiral ring are fixedly connected to the bottom surface of the first positioning plate, and the bottom ends of the inner support water hose and the first elastic spiral ring are fixedly connected to the top surface of the second positioning plate.

[0014] Preferably, the surface of the limiting rod is provided with a cross-shaped anti-rotation strip, and the lower end of the hydraulic press is provided with a sliding groove adapted to the limiting rod. The limiting rod slides through the lower end of the hydraulic press, and the two are sized to match.

[0015] Preferably, multiple sets of the inner support water belt and the first elastic spiral ring are provided, and the multiple sets of the inner support water belt and the first elastic spiral ring are distributed at equal intervals and intertwined in a circular axis array.

[0016] Preferably, the external support assembly further includes two sets of uprights slidably inserted on both sides of the lower end of the hydraulic press and symmetrically distributed, and a sleeve fixed to the upper end of the two sets of uprights. The bottom end of the limiting rod is fixed with a connecting plate, and the two ends of the connecting plate are movably provided with reversing rods. The other end of the reversing rod is movably connected to the bottom end of the upright.

[0017] The top ends of the outer support water hose and the second elastic spiral ring are fixedly connected to the top surface of the inner wall of the sleeve, and the sleeve is movably sleeved on the outside of the outer support water hose;

[0018] One side of the upright pole slides vertically up and down within the hydraulic press via an I-shaped slide rail.

[0019] Preferably, multiple sets of the external support water hose and the second elastic spiral coil are provided, and the multiple sets of the external support water hose and the second elastic spiral coil are distributed equidistantly and intertwined in a circular axis array.

[0020] Preferably, the reversing rod is provided in two symmetrically distributed sets, the middle of the reversing rod is rotatably connected to the inner wall of the hydraulic press through a rotating shaft, and anti-jamming grooves are provided through both ends of the reversing rod. Hinged columns are fixed at both ends of the connecting plate and the bottom end of the upright, and the hinged columns slide inside the anti-jamming grooves.

[0021] Preferably, the water control assembly further includes a water storage ring fixed above the hydraulic press table, and the interior of the water storage ring, the interior of the water pipe, and the interior of the hydraulic press cavity are connected.

[0022] Preferably, the outer support water hose is hollow inside, the bottom end of the outer support water hose is fixedly connected to the water storage ring, and the interior of the outer support water hose is connected to the interior of the water storage ring.

[0023] Preferably, the water storage ring surrounds the outside of the lower mold in a circular manner, and the inner diameter of the water storage ring is larger than the maximum outer diameter of the lower mold.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. In this invention, the upper mold first pushes the No. 1 positioning plate vertically downward, compressing the No. 1 elastic spiral ring and the inner support water belt. As the No. 1 elastic spiral ring is compressed, its diameter increases, and the inner support water belt gradually expands. Consequently, the inner support water belt and the No. 1 elastic spiral ring gradually move towards the inner wall of the steel ring, eventually adhering tightly to it. The inner support water belt also fills the interior of the steel ring. Simultaneously, the downward movement of the No. 1 positioning plate indirectly drives the sleeve upward, stretching the No. 2 elastic spiral ring and reducing its diameter. Ultimately, the No. 2 elastic spiral ring wraps around the outer wall of the steel ring, and the water in the hydraulic press cavity is squeezed into the outer support water belt, causing it to expand and envelop the outside of the steel ring. At this point, the upper mold... Before even touching the steel ring, the inner and outer support hoses and the second elastic spiral ring have already centered and aligned the steel ring. This means that when manually placing the steel ring, workers don't need to spend excessive time observing whether the tilt angle exceeds the normal range. Furthermore, compared to traditional point-contact expansion plates, the flexible centering support method used in this invention causes minimal damage to the steel ring. The contact area between the outer and inner support hoses and the steel ring is also more sufficient, resulting in more balanced stress on the steel ring and improving the finished product's pass rate. This invention is applicable to steel rings of various sizes; the adaptive changes in the inner and outer support hoses, the first elastic spiral ring, and the second elastic spiral ring allow for support and centering of steel rings of different sizes.

[0026] 2. This invention causes the inner support water belt, outer support water belt, first elastic spiral ring, and second elastic spiral ring to deform by moving the upper mold downward, and adapts to the size of different steel rings to provide more comprehensive wrapping and support. It does not require other power drive systems, which can save certain electricity and maintenance costs. Compared with the traditional upper mold forced downward centering, the flexible centering method of this invention has a more significant protective effect on the steel ring. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the first three-dimensional structure of the present invention.

[0028] Figure 2 This is a schematic diagram of the upper mold in the pressed-down state of the present invention.

[0029] Figure 3 This is a schematic diagram of the fully compressed structure of the present invention.

[0030] Figure 4 This is a cross-sectional front view of the structure of the present invention.

[0031] Figure 5 For the present invention Figure 3 A cross-sectional front view of the structure in the current state.

[0032] Figure 6 This is a partial cross-sectional structural diagram of the present invention.

[0033] Figure 7 This is a schematic diagram of the internal support water belt and the first elastic spiral ring structure of the present invention.

[0034] Figure 8 This is a partial cross-sectional structural diagram of the present invention.

[0035] Figure 9 This is a schematic diagram of the external support water hose and the second elastic spiral ring structure of the present invention.

[0036] Figure 10 This is a partial cross-sectional structural diagram of the present invention.

[0037] Figure 11 This is a schematic diagram of the commutator structure of the present invention.

[0038] Figure 12 This is a schematic diagram of the pole structure of the present invention.

[0039] In the diagram: 1. Hydraulic press; 2. Upper mold; 3. Positioning plate No. 1; 4. Sleeve; 5. Inner support water hose; 6. Limiting rod; 7. Lower mold; 8. Outer support water hose; 9. Return spring; 10. Water pipe; 11. Vertical pole; 12. Connecting plate; 13. Reversing rod; 14. Water storage ring; 15. Positioning plate No. 2; 16. Fixing plate; 17. Water pressure plate; 18. Elastic spiral ring No. 1; 19. Elastic spiral ring No. 2. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Please see Figures 1 to 12 The present invention provides a technical solution: an automobile wheel hub pressing and forming device, including a hydraulic press 1, an upper mold 2 set at one end of the hydraulic push rod of the hydraulic press 1 to deform the steel ring by pressing it downward, and a lower mold 7 set on the table of the hydraulic press 1 to cooperate with the upper mold 2 to complete the deformation of the lower end of the steel ring by pressing. It also includes an inner support component that moves through the middle of the lower mold 7 and is deformed by being pressed by the upper mold 2 to fill the interior of the steel ring and pre-flexibly center the steel ring; an outer support component that is moved on the table of the hydraulic press 1 and is deformed by being pulled upward by the inner support component to wrap around the outside of the steel ring and pre-support the steel ring; and a water control component that expands the outer support component by injecting water when the inner support component is pressed down and then flexibly positions the steel ring by pressing it against the outer wall of the steel ring.

[0042] The inner support assembly includes a limiting rod 6 that moves through the center of the lower mold 7, a first elastic spiral ring 18 that moves around the upper end of the limiting rod 6, and an inner support water belt 5 that moves along the spiral trajectory of the first elastic spiral ring 18 and is fitted around the first elastic spiral ring 18.

[0043] The external support assembly includes a second elastic spiral ring 19 movably mounted above the platform of the hydraulic press 1 and an external support water hose 8 that is fitted around the outside of the second elastic spiral ring 19 along its spiral trajectory.

[0044] The water control assembly includes water pipes 10 symmetrically distributed on both sides inside the hydraulic press 1 and a pressure plate 17 fixedly sleeved on the outer wall of the limit rod 6.

[0045] In specific implementation, the upper mold 2 and the hydraulic rod are integrated. The hydraulic press 1 includes a basic frame, control circuit box, hydraulic rod, etc., which can be directly referred to as existing technology. The specific circuit connection relationship and control method of the hydraulic press 1 can be kept consistent with existing technology, and will not be elaborated on here. The dimensions and force capacity of all components in the inner support assembly and outer support assembly must meet the requirements. The inner support water belt 5 and the outer support water belt 8 are filled with water without gaps, and the amount of water in the inner support water belt 5 and the outer support water belt 8 must be excessive. The height of the inner support water belt 5 and the first elastic spiral ring 18 under no-stress state must be higher than the height of the steel ring to be pressed. The minimum diameter of the second elastic spiral ring 19 after being stretched must also be smaller than the outer wall diameter of the steel ring. In other words, the amount of water must be more than necessary. 5. The deformation range of the outer support water belt 8, the first elastic spiral ring 18, and the second elastic spiral ring 19 must be compatible with the size of the steel ring to be produced. The inner support water belt 5 and the outer support water belt 8 must be made of flexible materials with sufficient elasticity and good wear resistance, including but not limited to natural rubber and silicone. The first elastic spiral ring 18 and the second elastic spiral ring 19 must be made of alloy materials with strong fatigue resistance and high elasticity, including but not limited to beryllium bronze alloy and nickel-titanium alloy. The shape of the first elastic spiral ring 18 and the second elastic spiral ring 19 is similar to that of existing springs. In addition, the maximum diameter of the first elastic spiral ring 18 after compression is smaller than the diameter of the second positioning plate 15, so as to prevent the first elastic spiral ring 18 from being unable to pass through the middle of the lower mold 7, causing damage to the structure of the lower mold 7 when the upper mold 2 is pressed down. The diameter of the outer support water belt 8 and the second elastic spiral ring 19 under no-force conditions must be larger than the bottom diameter of the lower mold 7 to prevent the flared opening at the bottom of the steel ring from being blocked by the outer support water belt 8 and the second elastic spiral ring 19 when taking out the material.

[0046] As a further embodiment of the present invention, the inner support assembly also includes a first positioning plate 3 fixed to the top of the limiting rod 6, a second positioning plate 15 fixedly sleeved on the outer surface of the limiting rod 6, and a return spring 9 fixed on the bottom surface of the second positioning plate 15, a fixing plate 16 fixed at the bottom end of the return spring 9, and the return spring 9 movably sleeved on the outside of the limiting rod 6.

[0047] The lower end of the hydraulic press 1 has a cavity. The fixed plate 16 divides the cavity into upper and lower parts. The fixed plate 16 is fixed to the inner wall of the cavity and is seamlessly connected. The fixed plate 16 is located directly above the pressure plate 17.

[0048] The top ends of the inner support water hose 5 and the first elastic spiral ring 18 are fixedly connected to the bottom surface of the first positioning plate 3, and the bottom ends of the inner support water hose 5 and the first elastic spiral ring 18 are fixedly connected to the top surface of the second positioning plate 15.

[0049] In practice, multiple sets of return springs 9 are provided, and these sets are coaxially distributed in an intertwined manner. The elastic force of these multiple sets of return springs 9 is greater than that of these multiple sets of No. 1 elastic spiral coils 18, ensuring that the inner support water belt 5 is compressed to its limit and remains fully filled inside the steel ring before it can move downwards. The diameter of the pressure plate 17 is adapted to the inner diameter of the cavity of the hydraulic press 1. A rubber sealing plug needs to be fixed to the side wall of the pressure plate 17. The downward push of the pressure plate 17 ensures that water can only enter the outer support water belt 8 through the water pipe 10. When the pressure plate 17 moves upwards with the limit rod 6, the excess water in the outer support water belt 8 is sucked into the cavity, similar to the principle of a syringe. Here, the cavity, water pipe 10, water storage ring 14, and outer support water belt 8 are all filled with water. That is, when the water in the cavity is pushed into the outer support water belt 8, the water originally stored in the outer support water belt 8, plus the continuously injected water, will cause it to expand, achieving the effect of covering the outer wall of the steel ring.

[0050] As a further embodiment of the present invention, the surface of the limiting rod 6 is provided with a cross-shaped anti-rotation strip, and the lower end of the hydraulic press 1 is provided with a sliding groove that matches the limiting rod 6. The limiting rod 6 slides through the lower end of the hydraulic press 1, and the two are sized to match.

[0051] In practice, the design of the cross anti-rotation bar allows the limit rod 6 to move vertically up and down only, without tilting or rotating. The movement of the limit rod 6 directly affects whether the inner support water hose 5, the outer support water hose 8, the first elastic spiral ring 18, and the second elastic spiral ring 19 can expand normally and wrap around the inner and outer walls of the steel ring.

[0052] As a further embodiment of the present invention, multiple sets of inner support water belt 5 and first elastic spiral coil 18 are provided. The multiple sets of inner support water belt 5 and first elastic spiral coil 18 are distributed equidistantly and intertwined in a circular axis array. Multiple sets of outer support water belt 8 and second elastic spiral coil 19 are provided. The multiple sets of outer support water belt 8 and second elastic spiral coil 19 are distributed equidistantly and intertwined in a circular axis array.

[0053] In practice, the coaxial winding distribution of multiple sets of inner support water belts 5 and No. 1 elastic spiral ring 18, as well as multiple sets of outer support water belts 8 and No. 2 elastic spiral ring 19, allows the multiple sets of No. 1 elastic spiral ring 18 and No. 2 elastic spiral ring 19 to be compressed more evenly, and the multiple sets of inner support water belts 5 and outer support water belts 8 can cover the inner and outer walls of the steel ring more quickly when compressed.

[0054] As a further embodiment of the present invention, the external support assembly also includes two sets of uprights 11 slidably inserted on both sides of the lower end of the hydraulic press 1 and symmetrically distributed, and a sleeve 4 fixed on the upper end of the two sets of uprights 11. The bottom end of the limiting rod 6 is fixed with a connecting plate 12, and the two ends of the connecting plate 12 are movably provided with reversing rods 13. The other end of the reversing rod 13 is movably connected to the bottom end of the upright 11. Two sets of reversing rods 13 are symmetrically distributed. The middle of the reversing rod 13 is rotatably connected to the inner wall of the hydraulic press 1 through a rotating shaft. Anti-jamming grooves are opened through both ends of the reversing rod 13. The two ends of the connecting plate 12 and the bottom end of the upright 11 are all fixed with hinge columns, and the hinge columns slide inside the anti-jamming grooves.

[0055] The top ends of the outer support water hose 8 and the second elastic spiral ring 19 are fixedly connected to the top surface of the inner wall of the sleeve 4, and the sleeve 4 is movably sleeved on the outside of the outer support water hose 8.

[0056] One side of the upright pole 11 slides vertically up and down within the hydraulic press 1 via an I-shaped slide rail.

[0057] In practice, the inner diameter of the top of the sleeve 4 should be 2 ± 1 mm larger than the outer diameter of the upper mold 2. When the upper mold 2 moves downward, the sleeve 4 will not generate excessive friction with the upper mold 2 or even hinder each other's movement. When the upper mold 2 pushes the first positioning plate 3 downward, the sleeve 4 can move upward in conjunction with the design of the connecting plate 12, the reversing rod 13 and the upright rod 11. No additional drive system is required, which saves costs. Furthermore, the inner support assembly and the outer support assembly expand almost simultaneously, which saves operation time.

[0058] As a further embodiment of the present invention, the water control component also includes a water storage ring 14 fixed above the platform of the hydraulic press 1. The interior of the water storage ring 14, the interior of the water pipe 10, and the interior of the cavity of the hydraulic press 1 are connected. The interior of the outer support water belt 8 is hollow. The bottom end of the outer support water belt 8 is fixedly connected to the water storage ring 14. The interior of the outer support water belt 8 is connected to the interior of the water storage ring 14. The water storage ring 14 surrounds the exterior of the lower mold 7 in a ring-like manner. The inner diameter of the water storage ring 14 is larger than the maximum outer diameter of the lower mold 7.

[0059] In practice, when the outer support water belt 8 is stretched along with the second elastic spiral ring 19, although the outer support water belt 8 is stretched, there will still be a lot of gaps between it and the outer wall of the steel ring. The downward movement of the limiting rod 6 can almost simultaneously cause the pressure plate 17 to squeeze the water in the cavity into the outer support water belt 8, to compensate for the amount of water in the outer support water belt 8, so that it passively expands, thereby covering the outer wall of the steel ring, reducing the gap between the outer support water belt 8 and the outer wall of the steel ring, and making the stress of the steel ring more uniform.

[0060] Working Principle: When using this automotive wheel hub pressing and forming device, first connect the mains power to power the entire device. Then, place the wheel hub steel ring onto the lower mold 7. Note that this invention is only applicable to existing cold-pressed steel ring forming technology; old-fashioned hot-pressing technology cannot be used to avoid damaging the parts. Next, start the hydraulic press 1, causing the hydraulic rod of the hydraulic press 1 to push the upper mold 2 downwards. When the upper mold 2 moves downwards, it will first contact the first positioning plate 3 and push the first positioning plate 3 downwards. The first positioning plate 3 then drives the limit rod 6 to move vertically downwards. At this time, under the resistance of the return spring 9, the second positioning plate 15 will not easily move downwards. Therefore, the first elastic spiral ring 18 will be compressed and deformed under the resistance of the second positioning plate 15 and the squeezing action of the first positioning plate 3. The diameter of the first elastic spiral ring 18 also increases as it is compressed. The inner support water belt 5 is compressed by the vertical squeezing of the first positioning plate 3 and the first elastic spiral ring... The spiral ring 18 moves laterally towards the inner wall of the steel ring under the lateral expansion until the inner support water band 5 is tightly attached to the inner wall of the steel ring and covers the inside of the steel ring. Here, since the first elastic spiral ring 18 is compressed vertically, the first elastic spiral ring 18 and the inner support water band 5 are also expanding horizontally. Therefore, even if the steel ring is in a tilted state, it will be gradually straightened under the push of the first elastic spiral ring 18 and the inner support water band 5. When the water in the inner support water band 5 is compressed to the limit, the first positioning plate 3, the inner support water band 5, the limit rod 6 and the first elastic spiral ring 18 are in a rigid state inside the steel ring. When the upper mold 2 continues to move down, the second positioning plate 15 will be indirectly pushed down and squeeze the return spring 9, so that the lower part of the inner support water band 5 and the first elastic spiral ring 18 gradually enters the cavity of the hydraulic press 1, providing space for the upper mold 2 to continue to press down.

[0061] When the limit rod 6 moves downward, it simultaneously drives the connecting plate 12 and the pressure plate 17 downward. The connecting plate 12 pushes one end of the reversing rod 13 downward, and the reversing rod 13 is in a "seesaw" state. Its other end pushes the upright rod 11 to move vertically upward. The upright rod 11 drives the sleeve 4 to move upward, and then the sleeve 4 stretches the outer support water belt 8 and the second elastic spiral ring 19. Similarly, the more the second elastic spiral ring 19 is stretched, the smaller its diameter becomes, until the second elastic spiral ring 19 expands the outer support water belt 8 and is tightly attached to the outside of the steel ring. At the same time, the pressure plate 17 continuously pumps the hydraulic press 1 into the air. The water in the lower end of the cavity is squeezed out and enters the water storage ring 14 through the water pipe 10. Then, it enters the outer support water belt 8 from the water storage ring 14. The outer support water belt 8 expands continuously until it covers the outer wall of the steel ring, providing support to the outside of the steel ring. Together with the inner support water belt 5, it supports the inside of the steel ring. The inner support water belt 5 and the outer support water belt 8 almost cover and support the entire inner and outer walls of the steel ring, making the stress of the steel ring uniform. The upper mold 2 continues to press down until both ends of the steel ring are pressed and expanded under the reverse extrusion force of the upper mold 2 and the lower mold 7.

[0062] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A kind of automobile wheel hub press forming device, including hydraulic press (1), the upper die (2) of being arranged in the hydraulic press (1) hydraulic push rod one end by downward extrusion steel ring and making it produce deformation and the lower die (7) of being arranged on the hydraulic press (1) table surface and cooperating upper die (2) complete to steel ring lower end extrusion and make deformation, it is characterized by: It also includes an inner support component that is active through the middle of the lower mold (7) and deformed by the upper mold (2) to fill the inside of the steel ring and pre-flexibly center the steel ring; an outer support component that is active on the table of the hydraulic press (1) and deformed by the inner support component being pulled up hard when it moves down, thus wrapping around the outside of the steel ring and pre-supporting the steel ring; and a water control component that expands the outer support component by injecting water when the inner support component is pressed down and flexibly positions the steel ring by pressing it against the outer wall of the steel ring. The inner support assembly includes a limiting rod (6) that moves through the center of the lower mold (7), a first elastic spiral ring (18) that moves around the upper end of the limiting rod (6), and an inner support water belt (5) that moves along the spiral trajectory of the first elastic spiral ring (18) and moves around the outside of the first elastic spiral ring (18). The external support assembly includes a second elastic spiral ring (19) movably mounted above the table of the hydraulic press (1) and an external support water belt (8) that is fitted around the outside of the second elastic spiral ring (19) along the spiral trajectory of the second elastic spiral ring (19). The water control assembly includes water pipes (10) symmetrically distributed on both sides inside the hydraulic press (1) and a pressure plate (17) fixedly sleeved on the outer wall of the limiting rod (6). The inner support assembly also includes a first positioning plate (3) fixed to the top of the limiting rod (6), a second positioning plate (15) fixedly sleeved on the outer surface of the limiting rod (6), and a return spring (9) fixed on the bottom surface of the second positioning plate (15), a fixing plate (16) fixed at the bottom end of the return spring (9), and the return spring (9) movably sleeved on the outside of the limiting rod (6). The lower end of the hydraulic press (1) has a cavity. The fixing plate (16) divides the cavity into upper and lower parts. The fixing plate (16) is fixed to the inner wall of the cavity and is seamlessly connected. The fixing plate (16) is located directly above the pressure plate (17). The diameter of the pressure plate (17) is adapted to the inner diameter of the cavity of the hydraulic press (1), and the side wall of the pressure plate (17) is fixed with a rubber sealing plug. The top ends of the inner support water belt (5) and the first elastic spiral ring (18) are fixedly connected to the bottom surface of the first positioning plate (3), and the bottom ends of the inner support water belt (5) and the first elastic spiral ring (18) are fixedly connected to the top surface of the second positioning plate (15).

2. The press forming apparatus for a vehicle wheel hub according to claim 1, wherein: The surface of the limiting rod (6) is provided with a cross-shaped anti-rotation strip, and the lower end of the hydraulic press (1) is provided with a sliding groove that matches the limiting rod (6). The limiting rod (6) slides through the lower end of the hydraulic press (1), and the two are sized to match.

3. The apparatus for press forming of an automobile wheel hub according to claim 1, wherein: The inner support water belt (5) and the first elastic spiral ring (18) are provided in multiple sets, and the multiple sets of the inner support water belt (5) and the first elastic spiral ring (18) are distributed equidistantly and intertwined in a circular axis array manner.

4. The apparatus for press forming of an automobile wheel hub according to claim 1, wherein: The external support assembly also includes two sets of uprights (11) slidably inserted on both sides of the lower end of the hydraulic press (1) and symmetrically distributed, and a sleeve (4) fixed on the upper end of the two sets of uprights (11). The bottom end of the limiting rod (6) is fixed with a connecting plate (12), and the two ends of the connecting plate (12) are movably provided with reversing rods (13). The other end of the reversing rod (13) is movably connected to the bottom end of the upright (11). The top ends of the outer support water belt (8) and the second elastic spiral ring (19) are fixedly connected to the top surface of the inner wall of the sleeve (4), and the sleeve (4) is movably sleeved on the outside of the outer support water belt (8). One side of the upright (11) slides vertically up and down in the hydraulic press (1) via an I-shaped slide rail.

5. The apparatus for press forming of an automobile wheel hub according to claim 3, wherein: The external support water belt (8) and the second elastic spiral ring (19) are provided in multiple sets, and the multiple sets of the external support water belt (8) and the second elastic spiral ring (19) are distributed equidistantly and intertwined in a circular axis array manner.

6. The apparatus for press forming of an automobile wheel hub according to claim 4, wherein: The reversing rod (13) is provided with two symmetrically distributed sets. The middle of the reversing rod (13) is rotatably connected to the inner wall of the hydraulic press (1) through a rotating shaft. Anti-jamming grooves are provided at both ends of the reversing rod (13). Hinged columns are fixed at both ends of the connecting plate (12) and the bottom end of the upright (11), and the hinged columns slide inside the anti-jamming grooves.

7. The apparatus for press forming of an automobile wheel hub according to claim 1, wherein: The water control assembly also includes a water storage ring (14) fixed above the platform of the hydraulic press (1), and the interior of the water storage ring (14), the interior of the water pipe (10), and the interior of the cavity of the hydraulic press (1) are connected.

8. The apparatus for press forming of an automobile wheel hub according to claim 1, wherein: The interior of the outer support water belt (8) is hollow. The bottom end of the outer support water belt (8) is fixedly connected to the water storage ring (14), and the interior of the outer support water belt (8) is connected to the interior of the water storage ring (14).

9. The apparatus for press forming of an automobile wheel hub according to claim 7, wherein: The water storage ring (14) surrounds the outside of the lower mold (7) in a circular manner, and the inner diameter of the water storage ring (14) is larger than the maximum outer diameter of the lower mold (7).

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