A spinning lower die and a wheel hub spinning die using the same

Abstract

A spinning lower die and a hub spinning die using the same, comprising a fixed die module and a plurality of sliding die modules slidingly arranged on the fixed die module, the sliding die modules corresponding to spoke and rim connecting portions of a hub; characterized in that the sliding die module comprises first and second sliding blocks capable of sliding in a radial direction, outer wall surfaces of the first and second sliding blocks sliding outward can be spliced to form a smooth transition outer wall surface group, the outer wall surface groups of the plurality of sliding die modules can be connected to form an annular surface, at least part of the annular surface protrudes outward in a radial direction beyond a side wall surface of the fixed die module; adjacent first and second sliding blocks can slide in sequence with a stroke difference, the first and second sliding blocks sliding inward can be arranged in a staggered manner inside the side wall surface of the fixed die module; by arranging the sliding die modules on the fixed die module, a weight-reducing groove can be formed at the intersection of the rim and spoke of the hub blank during spinning forming, and the hub can be smoothly and easily demolded.

Description

Technical Field

[0001] This invention relates to the technical field of wheel hub manufacturing, and in particular to a spinning die and its application in wheel hub spinning. Background Technology

[0002] With the implementation and promotion of energy conservation and emission reduction policies, the automotive market, as a major energy consumer, is facing increasingly stringent energy-saving requirements. Further reducing vehicle weight is a key way to reduce raw material and energy consumption. However, after years of development, the main structural components of automobiles are largely fixed, making it extremely difficult to reduce weight simply by reducing the number of components. Therefore, people are considering improving the structural components of vehicles to reduce weight. Among these, the wheel hub, as an essential component, still has significant room for weight reduction. Research has found that reducing the weight of the wheel hub by one kilogram can increase a car's horsepower by ten, meaning that reducing the wheel hub weight allows the car to travel further.

[0003] Currently, the mainstream wheel hub manufacturing processes include low-pressure casting, spinning, and forging. Among these, due to the current trend towards lightweighting and economic efficiency, the spinning process has been gaining increasing market share year by year. The spinning process generally refers to first preparing the blank through low-pressure casting, then forming the rim by spinning the sidewall of the wheel hub blank, and finally manufacturing the wheel hub through machining and other processes. In the spinning process, forming a weight-reducing groove at the junction of the rim and spokes is a common weight-reduction measure. For example, Chinese utility model patent CN210146787U discloses a wheel spinning mold and demolding device. The wheel spinning mold includes an upper mold, a connecting sleeve, a slider, a lower mold, and a central connecting block. Multiple identical sliders are connected front to back to form a ring. The sliders are inserted into the annular groove between the side wall of the circular groove at the upper end of the lower mold and the central connecting block. During spinning, the arc-shaped convex edge is engaged at the junction of the outer wheel lip and the rim below the spokes. During demolding, the sliders can move up and down together with the wheel blank. This solves the problem of back-pull demolding at the junction of the rim and outer wheel lip of cold-spun wheels and can also produce wheel hubs with weight-reducing grooves.

[0004] However, the wheel spinning die disclosed in CN210146787U has certain problems. First, the slider can move up and down with the wheel blank during demolding, meaning that the slider and the lower die are separate structures. The slider needs to be reinstalled every time it is used, which is very inconvenient. At the same time, repeated installation will also cause installation dimension errors and affect manufacturing accuracy. Second, when the slider moves up with the wheel blank, it may fall and damage the die. Third, multiple identical sliders need to be connected front and back to form a ring to achieve the spinning of weight-reducing grooves. In order to ensure that they do not fall off easily when moving up, the multiple sliders must be tightly connected, making it very difficult to disassemble them from the wheel blank. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention proposes a spinning die, comprising a fixed module and several sliding modules slidably arranged on the fixed module. Each sliding module corresponds to the connection between the spokes and the rim of a wheel hub. Each sliding module includes a first slider and a second slider capable of radial sliding. The outer walls of the first and second sliders sliding outwards can be joined to form a smoothly transitioned outer wall surface group. The outer wall surface groups of the several sliding modules can be connected to form an annular surface, at least a portion of which protrudes radially outwards to the outer side wall of the fixed module. Adjacent first and second sliders can slide sequentially with a stroke difference, and the first and second sliders sliding inwards can be staggered and arranged inside the side wall of the fixed module.

[0006] The spinning lower die is a major component of the spinning die and is usually used in combination with the spinning upper die. The wheel hub blank is arranged between the spinning upper die and the spinning lower die and is inverted on the spinning lower die. The outer wall of the spinning upper die corresponds to the outer side of the wheel hub spokes, and the outer wall of the spinning lower die corresponds to the inner side of the wheel hub spokes and the downwardly extending rim. During spinning, the outer peripheral wall of the wheel hub blank extends and forms along the outer wall of the spinning lower die.

[0007] The fixing module is a component of the spinning lower die. It is generally fixedly arranged on the base component of the die (such as the lower die base mentioned below). The outer side wall of the fixing module corresponds to a section of the rim of the hub. In order to facilitate demolding, this section of the rim is designed as a flared shape that opens towards the opening.

[0008] The sliding module is a group of movable components movably mounted on the fixed module. When the sliding module slides outward, its outer wall surface can connect with the outer wall surface of the fixed module to form the outer wall surface of the spinning die. During spinning, the wheel hub blank can extend along the outer wall surface of the spinning die to form the desired rim shape. Furthermore, several sliding modules arranged in parallel can be connected to form a continuous, smooth, annular wall surface.

[0009] The first and second sliders are the basic components of each sliding module, and the arrangement of the first and second sliders on each sliding module is the same. Both sliders can slide back and forth on the fixed module, and their sliding direction is radial along the central axis of the spinning die. To enable the first and second sliders to slide back and forth, T-shaped sliders are provided on the first and second sliders, and a slide rail is provided on the fixed module. The first and second sliders are slidably arranged on the fixed module through the cooperation of the T-shaped sliders and the slide rail.

[0010] The first and second sliders can slide sequentially with a stroke difference, which includes at least the following aspects: First, the strokes of the first and second sliders are different, meaning that the strokes of the two sliders when moving inward or outward have a difference; second, the sliding of the first and second sliders is asynchronous, meaning that the two sliders slide sequentially; third, in order to enable inward and outward movement between two adjacent sliding modules, this means that adjacent sliders located in different sliding modules also slide sequentially; fourth, by setting the stroke difference between the two sliders, the first and second sliders are arranged in an inward and outward staggered manner after sliding inward.

[0011] The side wall of the fixing module refers to the wall facing the rim. During spinning, the sliding module protrudes outward to the outside of the side wall of the fixing module to press out the weight-reducing groove when the wheel hub blank is spun; while during demolding, the sliding module needs to be retracted into the inside of the side wall of the fixing module to allow the formed wheel hub to exit the spinning die.

[0012] According to the above technical solution, compared with the prior art, the beneficial technical effects of the present invention are as follows: First, by setting the sliding module on the fixed module, it ensures that the mold forms a weight-reducing groove at the junction of the rim and spokes when the wheel hub blank is spun, and also allows the wheel hub to be demolded smoothly and easily; Second, when the wheel hub is demolded, the sliding module only slides to avoid separation from the fixed module, and there is no need to separate it from the fixed module or reinstall it, effectively reducing the workload of personnel and ensuring the joining accuracy of the mold; Third, the sliding module will not move up and down with the wheel hub to separate, eliminating the need for... The process of assembling and disassembling the sliding module by personnel effectively improves processing efficiency; fourth, when multiple closely connected sliding modules slide inward, they will interfere and cannot slide, which is also one of the problems caused by the prior art (CN210146787U) when disassembling the slider. In order to solve this problem, the present invention splits the sliding module into two sliders that can slide sequentially. In this way, when moving the sliding module inward, one slider can be moved away first, and then the other slider can be moved away to move the entire sliding module inward, thereby solving the problem of difficulty in moving multiple sliders inward.

[0013] To enable the first and second sliders to slide inwards and outwards, a further technical solution is that, viewed along the axial direction of the spinning die, the first and second sliders are trapezoidal with an arc-bottom, wherein the outer side length of the first slider is shorter than the inner side length, and the outer side length of the second slider is longer than the inner side length. Furthermore, the outer sides of the first and second sliders are concentric arcs. The first and second sliders each have a first and a second joint surface arranged in parallel. When the first and second sliders slide outwards, the first and second joint surfaces abut against each other. Specifically, when the two sliders move outwards, the first and second joint surfaces fit together, providing mutual support. The trapezoidal arrangement of the two sliders has at least two advantages: First, when the two sliders slide inwards, the first slider (longer inside than outside) moves first, followed by the second slider, thus allowing the entire slider module to move inwards. Second, the two sliders also have a mutual pushing effect; for example, when the two sliders slide outwards, only the first slider needs to be pushed, and the second slider is driven to slide outwards through the engagement of the first and second joint surfaces. Furthermore, adjacent sliders between different sliding modules also form an engagement pattern similar to that between the first and second sliders. This not only allows them to move outward to form a continuous ring, but also allows the several sliding modules forming the ring to slide inward.

[0014] To enable the first and second sliders to slide inward, a further technical solution is that the spinning die also includes an ejector assembly. The ejector assembly includes a first ejector rod that is driven to the first slider and a second ejector rod that is driven to the second slider. When the ejector assembly drives the first and second sliders to slide inward, the first ejector rod first drives the first slider to move, and then the second ejector rod drives the second slider to move, thereby creating a stroke difference between the first and second sliders.

[0015] Since the multiple slider modules form a ring, it is not possible for all the slider modules to slide inwards simultaneously. The first slider needs to move first, and then the second slider needs to be driven to move inwards. To achieve this driving action, two specific implementation methods are described below:

[0016] First implementation method:

[0017] The first slider has a first groove that matches the first push rod, and the second slider has a second groove that matches the second push rod. The driving distance between the first push rod and the first groove is smaller than the driving distance between the second push rod and the second groove. The first and second push rods move synchronously toward the first and second sliders, respectively. The first push rod first drives the first slider to slide inward a certain distance, and then the second push rod drives the second slider to slide inward. The driving distance refers to the distance between the push rod and the groove. This driving distance can be formed by the first and second push rods having different lengths, the first and second grooves having different depths, the push rods and grooves having different lengths, or the push rods and grooves being positioned differently, as long as the first push rod touches the first slider first.

[0018] Furthermore, the ejection assembly also includes an ejection plate, a hydraulic cylinder, and an ejection shaft connected between the ejection plate and the hydraulic cylinder. The first ejector rod and the second ejector rod are fixedly connected to the ejection plate. The hydraulic cylinder drives the ejection plate to move synchronously toward the first slider and the second slider via the ejection shaft.

[0019] Second implementation method:

[0020] The ejection assembly also includes a controller and a first driving device and a second driving device connected to the controller via signals. The first driving device drives the first ejector rod, and the second driving device drives the second ejector rod. When the ejection assembly drives the first and second sliders to slide inward, the controller first controls the first driving device to drive the first ejector rod, causing the first slider to slide inward a certain distance. Then, the controller controls the second driving device to drive the second ejector rod, causing the second slider to slide inward. Controlling the first and second ejector rods to move with a certain time difference can also achieve the purpose of sequentially driving the first and second sliders.

[0021] To enable the first and second sliders to slide outwards, a further technical solution includes a third push rod and a reset block connected to the third push rod. The reset block is located inside the first slider, and has a driving slope on its side facing the first slider. The driving slope is arranged from top to bottom and from the outside inwards. When the third push rod moves upwards, it moves the reset block upwards, thus creating space for the first slider to slide inwards. When the third push rod moves downwards, it moves the reset block downwards. The reset block pushes the first slider outwards via the driving slope, and the first slider then pushes the second slider outwards via its sidewall. The third push rod is arranged parallel to the first and second push rods. The reset block moves up and down under the action of the third push rod, pushing the first slider outwards via the driving slope. Since the first and second sliders are two mating trapezoidal arc-bottoms, the first slider can further push the second slider outwards. Another advantage of setting the reset pressure block is that after the reset pressure block moves down, it falls inside the first slider, which is used to limit the movement of the first slider and the second slider, which helps to ensure the formation of the weight reduction groove during the spinning process of the wheel hub blank.

[0022] To enable demolding after the wheel hub is spun, a further technical solution includes a lower mold base and a central top block. The fixing module is mounted on the lower mold base, and the central top block is located within the fixing module, corresponding to the wheel hub's spokes and hub. A reset pull rod is also provided between the central top block and the lower mold base, and a reset spring is provided between the reset pull rod and the lower mold base. Under the action of the reset spring, the reset pull rod can pull the central top block downwards to reset. By setting the central top block, the mold can effectively achieve automatic demolding of the wheel hub, greatly reducing processing difficulty and improving processing efficiency.

[0023] Furthermore, the reset pressure block is disposed between the first slider and the central top block. The number of reset pressure blocks is the same as that of the first sliders and they correspond one-to-one. This ensures that multiple first sliders and second sliders can slide outwards, and at the same time, with the support of the central top block, the structural strength of the spinning die is further strengthened, ensuring the forming effect of the weight-reducing groove during the spinning process of the wheel hub blank.

[0024] Because the spinning die has the above-mentioned characteristics and advantages, it can be applied to wheel hub spinning dies, which include an upper spinning die and a lower spinning die.

[0025] Because of the above-mentioned features and advantages, this invention can be applied to spinning dies and their applications in wheel hub spinning dies. Attached Figure Description

[0026] Figure 1 This is a front view structural diagram of the hub spinning die;

[0027] Figure 2 This is a front view cross-sectional structural diagram of the hub spinning die;

[0028] Figure 3 This is an exploded structural diagram of the hub spinning mold;

[0029] Figure 4 This is a schematic diagram of the axial structure of the spinning die;

[0030] Figure 5 This is a top view of the structure of the spinning die;

[0031] Figure 6 yes Figure 5 A magnified schematic diagram of the structure at point K;

[0032] Figure 7 yes Figure 5 A schematic diagram of the cross-sectional structure along the AA direction;

[0033] Figure 8 yes Figure 7 A magnified schematic diagram of the structure at point M;

[0034] Figure 9 yes Figure 5 A schematic diagram of the cross-sectional structure along the BB direction;

[0035] Figure 10 yes Figure 9 A magnified schematic diagram of the structure at point N;

[0036] Figure 11 This is a schematic diagram of the axial structure of the sliding module mounted on the fixed module;

[0037] Figure 12 This is a schematic diagram of the axial structure of the first slider;

[0038] Figure 13 This is a schematic diagram of the axial side structure of the second slider;

[0039] Figure 14 This is a schematic diagram of the axial structure after the hub is spun;

[0040] Figure 15 This is a top view of the structure of the spinning die, showing the state of the sliding module when it moves inward;

[0041] Figure 16 yes Figure 15 A schematic diagram of the cross-sectional structure in the CC direction. Detailed Implementation

[0042] The structure of the wheel hub spinning die using the technical solution of the present invention will be further described below with reference to the accompanying drawings. Except where explicitly stated that they are equivalent or alternative embodiments, the various implementation details disclosed below may be selectively applied or combined in one embodiment even if they are not directly related or synergistic in function.

[0043] like Figures 1-3 as well as Figure 14 As shown, a wheel hub spinning die includes an upper spinning die 1 and a lower spinning die 2 arranged vertically. The upper spinning die 1 and the lower spinning die 2 are coaxially arranged, and a certain space is left between the upper spinning die 1 and the lower spinning die 2 for placing a wheel hub blank 3. The wheel hub blank 3 is fastened onto the lower spinning die 2. After spinning, the outer peripheral wall of the wheel hub blank 3 can be extended to form the rim 32 of the wheel hub. The formed wheel hub includes a wheel core 31, a rim 32, and spokes 33 connecting the wheel core 31 and the rim 32. The outer wall of the upper spinning die 1 corresponds to the front of the spokes 33 of the wheel hub and is pressed against the rim 32 to fix the wheel hub blank 3. The outer wall of the lower spinning die 2 corresponds to the back of the spokes 33 and the downwardly extending rim 32 of the wheel hub. During spinning, the outer peripheral wall of the wheel hub blank 3 extends along the outer wall of the lower spinning die 2 to form the shape.

[0044] like Figures 2-4As shown, the spinning lower die 2 includes a fixed module 4 and several sliding modules 5 slidably arranged on the fixed module 4. The sliding modules 5 are arranged between the spinning upper die 1 and the spinning lower die 2, and the sliding modules 5 correspond to the connection between the spoke 33 and the rim 32 of the wheel hub. The sliding modules 5 include a first slider 51 and a second slider 52. The first slider 51 and the second slider 52 can slide radially. The outer wall surfaces of the first slider 51 and the second slider 52 sliding outward can be spliced ​​to form a smoothly transitioned outer wall surface group. The outer wall surface groups of several sliding modules 5 can be connected to form an annular surface. At least part of the annular surface protrudes radially outward from the axial projection range of the fixed module 4. Adjacent first sliders 51 and second sliders 52 can slide sequentially and have a stroke difference. The first sliders 51 and the second sliders 52 sliding inward can be staggered within the axial projection range of the fixed module 4. The advantages of this design are as follows: First, by setting the sliding module 5 on the fixed module 4, it ensures that the mold forms a weight-reducing groove at the junction of the rim 32 and the spoke 33 when the wheel hub blank 3 is spun, and also allows the wheel hub to be demolded smoothly and easily. Second, when the wheel hub is demolded, the sliding module 5 simply slides to avoid the fixed module 4 without needing to separate from it or reinstall it, effectively reducing the workload of personnel and ensuring the processing accuracy of the mold. Third, the sliding module 5 does not move up and down with the wheel hub, eliminating the need for personnel to install and disassemble the sliding module 5, effectively improving processing efficiency.

[0045] like Figures 3-12As shown, the spinning die 2 has a central axis X, and both the fixed module 4 and the sliding module 5 are arranged along the central axis X. To spin the die into the shape of a wheel hub, the sliding module 5 is a movable component movably mounted on the fixed module 4. Several parallel sliding modules 5 can slide outwards. The outer wall surface of the sliding module 5 can not only connect vertically with the outer wall surface of the fixed module 4, but also connect horizontally to form a continuous, smooth annular outer wall surface, thereby supporting the wheel rim 32. The first slider 51 and the second slider 52 are the basic components of each sliding module 5, and the arrangement of the first slider 51 and the second slider 52 on each sliding module 5 is the same; that is, after several sliding modules 5 are connected together, the first slider 51 and the second slider 52 are arranged in an orderly, spaced-apart manner. To allow the first slider 51 and the second slider 52 to slide back and forth, a first T-shaped slider 511 is provided at the root of the first slider 51, and a second T-shaped slider 521 is provided on the second slider 52. Two types of slide rails are provided on the fixing module 4: a first slide rail 41 corresponding to the first T-shaped slider 511 and a second slide rail 42 corresponding to the second T-shaped slider 521. The first slider 51 and the second slider 52 are slidably arranged on the fixing module 4 through the cooperation of the sliders and slide rails. The first slide rail 41 and the second slide rail 42 are arranged radially along the central axis X of the spinning die 2, so that the two sliders can slide back and forth on the fixing module 4 along the radial direction of the central axis X.

[0046] To create weight-reducing grooves on the wheel hub blank, the annular surfaces formed by the sliding modules 5, after sliding outward, at least partially protrude outward from the side wall of the fixing module 4. However, this does not necessarily require all outer walls of the sliding modules 5 to protrude from the side wall of the fixing module 4; only the weight-reducing groove portion needs to protrude. Since the sliding modules 5 and the fixing module 4 exit from below the wheel hub together, the protruding sliding modules 5 effectively form barbs in the demolding direction. To ensure smooth demolding of the formed wheel hub, after sliding inward, the first slider 51 and the second slider 52 only need to be retracted to the inner side of the side wall of the fixing module 4. To allow the multiple sliding modules 5, which are combined into an annular shape, to contract inward to reduce their outer diameter, the first slider 51 and the second slider 52 need to be misaligned after inward movement; that is, the first slider 51 and the second slider 52 need to slide different lengths to create a certain stroke difference.

[0047] In order to allow the first slider 51 and the second slider 52 to slide inward and outward, as follows: Figures 4-16As shown, viewed along the axial direction of the spinning die 2, both the first slider 51 and the second slider 52 are trapezoidal with arc-bottomed shapes. The outer side length of the first slider 51 is shorter than the inner side length, while the outer side length of the second slider 52 is longer than the inner side length. The outer sides of the first slider 51 and the second slider 52 are concentric arcs. The first slider 51 and the second slider 52 have parallel first mating surfaces 512 and 522. The first slider 51 and the second slider 52 are two mating trapezoidal components. When the two sliders move outwards, the first mating surface 512 and the second mating surface 522 engage, and the outer sides of the first slider 51 and the second slider 52 smoothly connect to form a continuous arc. When the two sliders move inwards, due to the difference in their stroke, the outer sides of the first slider and the outer arc edges of the second slider separate and are arranged in an inward-outward offset manner. In this embodiment, both sliders are isosceles structures, and the center line of the sliders passes through the central axis X. The first joint surface 512 and the second joint surface 522 are parallel to the central axis X and arranged at intervals. The advantage of this arrangement is that when the adjacent sliding modules move outward and join, the left and right joint surfaces of the first slider 51 abut against the second slider 52 on both sides. This helps the first slider 51 and the second slider to form a ring with good strength, ensuring the spinning effect, while not affecting the inward movement of the first slider 51 and the second slider 52.

[0048] To allow the first slider 51 and the second slider 52 to slide inwards, as follows: Figures 3-11 As shown, the spinning die 2 further includes an ejector assembly 6. The ejector assembly 6 includes a first ejector rod 61 that is pulverizedly connected to the first slider 51 and a second ejector rod 62 that is pulverizedly connected to the second slider 52. When the ejector assembly 6 drives the first slider 51 and the second slider 52 to slide inward, the first ejector rod 61 first drives the first slider 51 to move, and then the second ejector rod 62 drives the second slider 52 to move, thereby causing the first slider 51 and the second slider 52 to slide sequentially.

[0049] In this embodiment, the first slider 51 is provided with a first groove 513 that matches the first push rod 61, and the second slider 52 is provided with a second groove 523 that matches the second push rod 62. The driving distance between the first push rod 61 and the first groove 513 is smaller than the driving distance between the second push rod 62 and the second groove 523. Further, the ejection assembly 6 also includes an ejection plate 63, a hydraulic cylinder 64, and an ejection shaft 65 connecting the ejection plate 63 and the hydraulic cylinder 64. The first push rod 61 and the second push rod 62 are fixedly connected to the ejection plate 63. The hydraulic cylinder 64 drives the ejection plate 63, along with the first push rod 61 and the second push rod 62, to move synchronously toward the first slider 51 and the second slider 52 via the ejection shaft 65. When the first push rod 61 and the second push rod 62 move synchronously toward the first slider 51 and the second slider 52, the first push rod 61 first drives the first slider 51 to slide inward for a certain distance, and then the second push rod 62 drives the second slider 52 to slide inward. The driving distance refers to the distance between the push rod and the slide groove, such as... Figures 7-10 As shown, the reason for the driving distance is that the first push rod 61 and the second push rod 62 have the same length, but the depths of the first slide groove 513 and the second slide groove 523 are different. Of course, setting the first push rod 61 and the second push rod 62 of different lengths and the first slide groove 513 and the second slide groove 523 of the same depth can achieve the same effect. In order to convert the upward driving force of the push rod into the inward sliding of the slider, the top of the first push rod 61 and the second push rod 62 are provided with a top inclined surface, and the bottom of the first slide groove 513 and the second slide groove 523 are provided with a bottom inclined surface. Through the interaction of the inclined surfaces, the first slider 51 and the second slider 52 can slide inward.

[0050] As another equivalent implementation: the ejector assembly 6 further includes a controller (not shown in the figure) and a first drive device (not shown in the figure) and a second drive device (not shown in the figure) connected to the controller via signals. The first drive device is used to drive the first ejector rod 61, and the second drive device is used to drive the second ejector rod 62. When the ejector assembly 6 drives the first slider 51 and the second slider 52 to slide inward, the controller first controls the first drive device to drive the first ejector rod 61 to move the first slider 51 inward for a certain distance, and then the controller controls the second drive device to drive the second ejector rod 62 to move the second slider 52 inward. By controlling the first ejector rod 61 and the second ejector rod 62 to move with a certain time difference, the purpose of driving the first slider 51 and the second slider 52 sequentially can also be achieved.

[0051] In order for the first slider 51 and the second slider 52 to slide outward, such as Figure 8 and Figure 11 As shown, the ejection assembly 6 further includes a third ejector rod 66 and a reset block 7 connected to the third ejector rod 66. The reset block 7 is disposed inside the first slider 51, and the reset block 7 has a driving inclined surface 71 on the side facing the first slider 51. The driving inclined surface 71 is arranged inclined from top to bottom from the outside to the inside. The reset block 7 has the following two functions: First, when the third ejector rod 66 moves upward, it can move the reset block 7 upward, thereby making room for the first slider 51 to slide inward; Second, when the third ejector rod 66 moves downward, it can move the reset block 7 downward. The reset block 7 pushes the first slider 51 to slide outward through the driving inclined surface 71, and the first slider 51 then pushes the second slider 52 to slide outward through its side wall. Figure 11 and Figure 12 As shown, to better cooperate with the driving inclined surface 71, a slider inclined surface 514 is also provided on the inner side of the first slider 51. The slider inclined surface 514 matches the driving inclined surface 71, thereby allowing the reset pressure block 7 to push the first slider 51 to slide outward more stably. The third push rod 66 is also fixedly connected to the ejector plate 63 and is arranged parallel to and moves synchronously with the first push rod 61 and the second push rod 62. The reset pressure block 7 moves up and down under the drive of the third push rod 66, pushing the first slider 51 through the driving inclined surface 71 to drive it to slide outward. The first slider 51 can further push the second slider 52 to slide outward, thereby realizing the outward movement of the sliding module 5.

[0052] In order to allow the wheel hub to be demolded after spinning, such as Figures 1-7As shown, it also includes a lower mold base 21 and a central top block 8. The fixing module 4, which is mounted on the lower mold base 21, has a central cavity. The central top block 8 is located in the central cavity of the fixing module 4 and corresponds to the spokes 33 and the hub 31 of the wheel hub. The central top block 8 is used to push the formed wheel hub upward. Its working principle is as follows: the hydraulic cylinder 64 pushes the ejector shaft 65 upward. The ejector shaft 65 drives the ejector plate 63 and the ejector rod fixing plate 67 connected to the ejector plate 63 to move upward. After moving upward a certain distance, the ejector rod fixing plate 67 contacts the bottom of the central top block 8 and pushes the central top block 8 upward. The purpose of this arrangement is to first move the first slider 51 and the second slider 52 inward, and then let the central top block 8 push out the wheel hub. A reset pull rod 81 is also provided at the lower part of the central top block 8. The lower end of the reset pull rod 81 passes through the lower mold base 21. A reset spring 82 is provided between the reset pull rod 81 and the lower mold base 21. Under the action of the reset spring 82, the reset pull rod 81 pulls the central top block 8 downward and resets it into the central cavity. By setting the central top block 8, the mold can achieve automatic demolding function, which greatly reduces the processing difficulty and improves the processing efficiency. Furthermore, the reset pressure block 7 is set between the first slider 51 and the central top block 8. The number of reset pressure blocks 7 is the same as the number of first sliders 51 and they correspond one-to-one. This ensures that multiple first sliders 51 and second sliders 52 can slide outward. At the same time, with the support of the central top block 8, the structural strength of the spinning lower mold 2 is further strengthened, especially in supporting the inward extrusion force of the roller during spinning, which is beneficial to ensuring the forming effect of the weight reduction groove of the wheel blank 3 during spinning.

Claims

1. A spinning die, comprising a fixed module and a plurality of sliding modules slidably arranged on the fixed module, wherein the sliding modules correspond to the connection portion between the spokes and the rim of a wheel hub; characterized in that, The sliding module includes a first slider and a second slider that can slide radially. The outer wall surfaces of the first slider and the second slider that slide outward can be spliced ​​together to form a smoothly transitioned outer wall surface group. The outer wall surface groups of several sliding modules can be connected to form an annular surface. At least part of the annular surface protrudes radially outward to the outer side wall of the fixed module. Adjacent first sliders and second sliders can slide sequentially and have a stroke difference. The first sliders and second sliders that slide inward can be staggered and arranged inside the side wall of the fixed module. Viewed along the axial direction of the spinning die, the first slider and the second slider are trapezoidal with an arc bottom. The outer side length of the first slider is less than the inner side length, and the outer side length of the second slider is greater than the inner side length. The outer sides of the first slider and the second slider are concentric arcs. The first slider and the second slider have a first joint surface and a second joint surface arranged in parallel. When the first slider and the second slider slide outward, the first joint surface and the second joint surface abut against each other. It also includes an ejection assembly, which includes a first ejector rod that is driven to the first slider and a second ejector rod that is driven to the second slider. When the ejection assembly drives the first slider and the second slider to slide inward, the first ejector rod first drives the first slider to move, and then the second ejector rod drives the second slider to move, thereby creating a stroke difference between the first slider and the second slider. It also includes a third push rod and a reset block connected to the third push rod. The reset block is disposed inside the first slider. The reset block has a driving slope on the side facing the first slider. The driving slope is arranged from top to bottom and from the outside to the inside. When the third push rod moves upward, it can move the reset block upward, thereby making room for the first slider to slide inward. When the third push rod moves downward, it can move the reset block downward. The reset block pushes the first slider to slide outward through the driving slope. The first slider then pushes the second slider to slide outward through its side wall. It also includes a lower mold base and a central top block. The fixing module is disposed on the lower mold base, and the central top block is disposed in the fixing module and corresponds to the spokes and the core of the wheel hub. A reset pull rod is also disposed between the central top block and the lower mold base, and a reset spring is disposed between the reset pull rod and the lower mold base. Under the action of the reset spring, the reset pull rod can pull the central top block down to reset. The reset pressure block is disposed between the first slider and the middle top block, and the number of reset pressure blocks is the same as that of the first slider and they correspond one-to-one.

2. The spinning die according to claim 1, characterized in that, The first slider is provided with a first groove that matches the first push rod, and the second slider is provided with a second groove that matches the second push rod. The driving distance between the first push rod and the first groove is less than the driving distance between the second push rod and the second groove. The first push rod and the second push rod move synchronously toward the first slider and the second slider. The first push rod first drives the first slider to slide inward for a certain distance, and then the second push rod drives the second slider to slide inward.

3. The spinning die according to claim 2, characterized in that, The ejection assembly further includes an ejection plate, a hydraulic cylinder, and an ejection shaft connected between the ejection plate and the hydraulic cylinder. The first ejector rod and the second ejector rod are fixedly connected to the ejection plate. The hydraulic cylinder drives the ejection plate to move synchronously toward the first slider and the second slider via the ejection shaft.

4. The spinning die according to claim 1, characterized in that, The ejection assembly also includes a controller and a first driving device and a second driving device connected to the controller. The first driving device is used to drive the first ejector rod, and the second driving device is used to drive the second ejector rod. When the ejection assembly drives the first slider and the second slider to slide inward, the controller first controls the first driving device to drive the first ejector rod to move the first slider inward for a certain distance, and then the controller controls the second driving device to drive the second ejector rod to move the second slider inward.

5. A wheel hub spinning die, characterized in that, It includes a spinning upper die and a spinning lower die as described in any one of claims 1 to 4.

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