High-precision processing and forming device for center spline hole of aluminum alloy hub
Patent Information
- Application Number
- CN202522473380.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-21
- Publication Date
- 2026-10-16
- Estimated Expiration
- 2035-11-21
AI Technical Summary
现有铝合金轮毂中心花键孔的成型装置大多是将轮毂放置在加工台上，将拉杆插入轮毂预留加工孔，并通过液压装置带动拉杆下移，依靠拉杆外表面一系列切削齿完成作业，但在加工前，轮毂的定位固定大多仅靠加工台顶部的圆柱与轮毂内圈的接触以完成，缺乏更加有效地固定结构，而拉杆在对轮毂进行切削时，极易因切削齿的挤压导致轮毂发生轻微偏移，进而易导致花键孔的成型精度受到影响
本实用新型通过设置固定机构，具体是将轮毂居中放置在加工台顶部后，启动电动推杆带动三角块向加工台中心处移动，挤压推动升降环上移，升降环会挤压推动四个底柱和弧形块相互靠近，与轮毂外表面接触并将其固定，加工完成后启动电动推杆带动三角块远离加工台中心，升降环通过自身重力下坠，底柱失去了挤压，弹簧一通过自身弹力推动环形块和弧形块复位，解除对轮毂的固定，此结构能够快速固定和拆卸轮毂，能够有效地使轮毂在加工过程中，保持稳定，进而有效提高花键孔的成型精度。
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Figure CN224855072U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of aluminum alloy wheel hub processing technology, and in particular relates to a high-precision processing and forming device for the center spline hole of aluminum alloy wheel hub. Background Technology
[0002] A high-precision machining and forming device for the center spline hole of an aluminum alloy wheel hub is an integrated precision manufacturing equipment designed specifically for the center spline hole of an aluminum alloy wheel hub (a toothed hole structure used for precise matching with automotive drive shafts, bearings and other components). Its core objective is to ensure the reliable connection between the aluminum alloy wheel hub and the transmission system, efficient power transmission and long-term stability. Most existing aluminum alloy wheel hub center spline hole forming devices place the wheel hub on a machining table, insert a tie rod into the pre-drilled hole in the wheel hub, and use a hydraulic device to move the tie rod downwards. The operation is completed by a series of cutting teeth on the outer surface of the tie rod. However, before processing, the positioning and fixing of the wheel hub is mostly completed by the contact between the cylinder on the top of the machining table and the inner ring of the wheel hub. There is a lack of a more effective fixing structure. When the tie rod cuts the wheel hub, the wheel hub is very easy to be slightly offset due to the extrusion of the cutting teeth, which can easily affect the forming accuracy of the spline hole. Utility Model Content
[0003] The purpose of this invention is to provide a high-precision machining and forming device for the center spline hole of an aluminum alloy wheel hub. By setting a fixing mechanism, specifically, after the wheel hub is placed centered on the top of the machining table, an electric push rod is activated to move a triangular block towards the center of the machining table, squeezing and pushing a lifting ring upwards. The lifting ring squeezes and pushes the four base columns and arc-shaped blocks closer together, contacting and fixing them to the outer surface of the wheel hub. After machining, the electric push rod is activated to move the triangular block away from the center of the machining table. The lifting ring falls due to its own gravity, the base columns lose their compression, and the spring pushes the ring block and arc-shaped block back to their original position, releasing the wheel hub from fixation. This structure allows for quick fixing and disassembly of the wheel hub, effectively maintaining its stability during machining, thereby significantly improving the forming accuracy of the spline hole. It solves the problem that existing wheel hub spline hole machining methods mostly rely solely on the cylinder at the top of the machining table contacting the inner ring of the wheel hub for positioning and fixing, lacking a more effective fixing structure. Furthermore, the cutting teeth of the pull rod squeeze the wheel hub during machining, easily causing slight wheel hub displacement, which in turn affects the forming accuracy of the spline hole.
[0004] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model relates to a high-precision machining and forming device for the center spline hole of an aluminum alloy wheel hub. It includes a base, inside which a hydraulic cylinder is installed. Two guide rods are fixedly connected to the top of the base. A lifting plate is fixedly connected to the top output end of the hydraulic cylinder. A fixing column is fixedly connected to the top of the lifting plate. A pull rod is arranged above the lifting plate. A machining table is fixedly connected to the top of the two guide rods. The device also includes: a fixing mechanism, located inside the machining table, used to fix the wheel hub; the fixing mechanism includes four arc-shaped blocks; a circular groove is formed inside the machining table; a lifting ring is slidably limited to the inner wall of the circular groove; and a triangular block is arranged inside the circular groove. A locking mechanism is located inside the fixing column, used to lock the pull rod. The triangular block is triangular in shape, and the outer and inner surfaces of the lifting ring are both annular conical surfaces.
[0005] Furthermore, the lifting plate is slidably limited to the outer surfaces of the two guide rods, and an annular groove is provided at the bottom of the outer surface of the pull rod.
[0006] Furthermore, the fixing mechanism includes four movable rods, each with an annular block fixedly connected to its outer surface. A spring is sleeved on the outer side of each movable rod. A block is fixedly connected to the end of each of the four movable rods that is close to each other. A top column is fixedly connected to the top of each block. The ends of the four arc-shaped blocks that are far apart from each other are fixedly connected to the four top columns respectively. A bottom column is fixedly connected to the bottom of each block. The arc-shaped blocks are arc-shaped, and the bottom end of the bottom column is spherical. The spherical bottom end of the bottom column allows the inner ring of the lifting ring to better contact it, ensuring the stable operation of the fixing work.
[0007] Furthermore, the locking mechanism includes a push plate, a connecting rod is fixedly connected to the side of the push plate near the fixed post, a ring is fixedly connected to the end of the connecting rod near the fixed post, a lifting groove is provided on the outer surface of the fixed post, and the connecting rod slides and limits the engagement with the lifting groove.
[0008] Furthermore, the top of the processing table has four square slots, and the square block slides and limits the movement of the square slots. The inside of the processing table has four circular slots, and the annular block slides and limits the movement of the circular slots. The moving rod slides and limits the movement of the processing table. One end of the spring is fixedly connected to the annular block, and the other end of the spring is fixedly connected to the inner wall of the circular slot. Four support rods are fixedly connected to the outer surface of the lifting ring. The inner wall of the circular slot has four limiting slots, and the support rods slide and limit the movement of the limiting slots. The square slots and circular slots are interconnected. During the lifting and lowering process, the lifting ring will drive the four support rods to move in the corresponding limiting slots. The four support rods work together to ensure that the lifting ring does not rotate. In addition, there is a distance between the bottom of the limiting slot and the top of the base plate, so that when the lifting ring descends to the lowest point, its bottom will not contact the top of the base plate, allowing the triangular block to better compress the lifting ring.
[0009] Furthermore, the inner wall of the circular groove is provided with a receiving groove, and an electric push rod is fixedly connected inside the processing table. The output end of the electric push rod is fixedly connected to the side of the triangular block near the electric push rod. The triangular block is slidably limited in cooperation with the receiving groove. A base plate is fixedly connected to the bottom of the processing table. The receiving groove is interconnected with the circular groove. During the processing, a small amount of debris will enter the circular groove through the square groove and eventually fall onto the base plate. When cleaning, the base plate can be removed for cleaning by unscrewing the bolts on the base plate.
[0010] Furthermore, a slot is provided at the top of the fixed column, the pull rod is inserted into the slot, a second circular groove is provided inside the fixed column, the ring is slidably limited to the second circular groove, and three movable grooves are provided on the inner wall of the second circular groove; the slot, the second circular groove and the three movable grooves are interconnected.
[0011] Furthermore, each of the three movable grooves has a wedge block that is slidably limited to its inner wall. The wedge block has an inclined groove inside. The ring is slidably limited to the inclined groove. Each of the three wedge blocks has a spring two fixedly connected to its opposite side. The end of the spring two that is away from the wedge block is fixedly connected to the inner wall of the movable groove. The inclined groove is adapted to the outer surface of the ring. The sides of the three wedge blocks that are close to each other are all inclined surfaces.
[0012] This utility model has the following beneficial effects: This invention utilizes a fixing mechanism. Specifically, after the wheel hub is placed centered on the top of the processing table, an electric push rod is activated to move the triangular block towards the center of the processing table. This pushes the lifting ring upwards, causing the lifting ring to press and push the four bottom pillars and the arc-shaped block closer together, contacting and fixing them to the outer surface of the wheel hub. After processing, the electric push rod is activated to move the triangular block away from the center of the processing table. The lifting ring falls due to its own gravity, the bottom pillars are no longer compressed, and the spring pushes the ring block and the arc-shaped block back to their original positions, releasing the wheel hub from fixation. This structure allows for quick fixing and disassembly of the wheel hub, effectively maintaining its stability during processing and thus significantly improving the forming accuracy of the spline hole.
[0013] This invention features a locking mechanism. Specifically, the push plate is first pushed up, causing the ring to move. Then, the pull rod is inserted into the slot, which compresses and pushes the three wedges away from each other. Simultaneously, the second spring is compressed. Once the slot is fully inserted, the second spring, through its own elasticity, pushes the wedges, now free from compression, into the annular groove and into contact with the pull rod, thus locking the pull rod. For disassembly, the push plate is pushed down, causing the ring to enter the inclined grooves of the three wedges and compress and push the three wedges away from each other until the ring moves to its limit. At this point, the wedges leave the annular groove, and the pull rod can be removed. This mechanism allows for quick locking and unlocking of the pull rod, ensuring the stable operation of broaching.
[0014] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description
[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the overall structure of the fixing mechanism of this utility model; Figure 3 This is a schematic diagram of the limiting groove structure of this utility model; Figure 4 This is a schematic diagram of the annular block structure of this utility model; Figure 5 This is a schematic diagram of the lifting groove structure of this utility model; Figure 6 This is a schematic diagram of the circular groove structure of this utility model; Figure 7 This is a schematic diagram of the movable slot structure of this utility model.
[0017] The attached diagram lists the components represented by each number as follows: 1. Base; 11. Hydraulic cylinder; 12. Guide rod; 13. Lifting plate; 14. Fixed column; 15. Pull rod; 151. Annular groove; 16. Processing table; 2. Fixing mechanism; 21. Moving rod; 211. Annular block; 212. Spring one; 213. Square block; 214. Top column; 215. Arc block; 216. Bottom column; 22. Square groove; 23. Circular groove; 24. Lifting ring; 241. Support rod; 242. Limiting groove; 25. Circular groove one; 26. Receiving groove; 27. Electric push rod; 271. Triangular block; 28. Base plate; 3. Locking mechanism; 31. Push plate; 311. Connecting rod; 312. Circular ring; 32. Lifting groove; 33. Slot; 34. Circular groove two; 35. Moving groove; 36. Wedge block; 361. Inclined groove; 362. Spring two. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0019] Please see Figures 1-7As shown, this utility model is a high-precision machining and forming device for the center spline hole of an aluminum alloy wheel hub. It includes a base 1, a hydraulic cylinder 11 installed inside the base 1, two guide rods 12 fixedly connected to the top of the base 1, a lifting plate 13 fixedly connected to the top output end of the hydraulic cylinder 11, a fixed column 14 fixedly connected to the top of the lifting plate 13, a pull rod 15 arranged above the lifting plate 13, and a processing table 16 fixedly connected to the top of the two guide rods 12. It also includes: a fixing mechanism 2, which is located inside the processing table 16 and is used to fix the wheel hub. The fixing mechanism 2 includes four arc-shaped blocks 215. A circular groove 25 is opened inside the processing table 16. A lifting ring 24 is slidably limited and fitted inside the inner wall of the circular groove 25. A triangular block 271 is arranged inside the circular groove 25; a locking mechanism 3, which is located inside the fixed column 14 and is used to lock the pull rod 15; the triangular block 271 is triangular, and the outer surface and inner side of the lifting ring 24 are both annular conical surfaces. The lifting plate 13 slides and is limited by the outer surface of the two guide rods 12. The bottom of the outer surface of the pull rod 15 is provided with an annular groove 151. The fixing mechanism 2 includes four moving rods 21. The outer surface of the moving rods 21 is fixedly connected to an annular block 211. A spring 212 is sleeved on the outer side of the moving rods 21. The ends of the four moving rods 21 that are close to each other are fixedly connected to a block 213. The top of the block 213 is fixedly connected to a top post 214. The ends of the four arc-shaped blocks 215 that are far from each other are fixedly connected to the four top posts 214 respectively. The bottom of the block 213 is fixedly connected to a bottom post 216. The arc-shaped blocks 215 are arc-shaped, and the bottom end of the bottom post 216 is spherical. The locking mechanism 3 includes a push plate 31. A connecting rod 311 is fixedly connected to the side of the push plate 31 near the fixed post 14. A ring 312 is fixedly connected to the end of the connecting rod 311 near the fixed post 14. A lifting groove 32 is provided on the outer surface of the fixed post 14. The connecting rod 311 and the lifting groove 32 are slidably limited to each other. The top of the processing table 16 has four square slots 22, and the square block 213 is slidably limited to the square slots 22. The inside of the processing table 16 has four circular slots 23, and the annular block 211 is slidably limited to the circular slots 23. The moving rod 21 is slidably limited to the inside of the processing table 16. One end of the spring 212 is fixedly connected to the annular block 211, and the other end of the spring 212 is fixedly connected to the inner wall of the circular slot 23. Four support rods 241 are fixedly connected to the outer surface of the lifting ring 24. The inner wall of the circular slot 25 has four limiting slots 242, and the support rods 241 are slidably limited to the limiting slots 242. The square slots 22 and the circular slots 23 are interconnected.The inner wall of the circular groove 25 is provided with a receiving groove 26. An electric push rod 27 is fixedly connected inside the processing table 16. The output end of the electric push rod 27 is fixedly connected to the side of the triangular block 271 near the electric push rod 27. The triangular block 271 is slidably limited in cooperation with the receiving groove 26. A base plate 28 is fixedly connected to the bottom of the processing table 16. After the wheel hub is placed in the center on the top of the processing table 16, the electric push rod 27 is activated to move the triangular block 271 toward the center of the processing table 16, which squeezes and pushes the lifting ring 24 upward. The lifting ring 24 will squeeze and push the four bottom pillars 216 and the arc-shaped block. 215 approach each other, contact and fix the outer surface of the hub. After processing, the electric push rod 27 is activated to move the triangular block 271 away from the center of the processing table 16. The lifting ring 24 falls due to its own weight, the bottom column 216 is no longer compressed, and the spring 212 pushes the ring block 211 and the arc block 215 to reset through its own elasticity, releasing the hub from fixation. This structure can quickly fix and disassemble the hub, effectively keeping the hub stable during processing, thereby effectively improving the forming accuracy of the spline hole; the receiving groove 26 is connected to the circular groove 25.
[0020] The top of the fixed column 14 has a slot 33, and the pull rod 15 is inserted into the slot 33. The fixed column 14 has a second circular groove 34 inside, and the ring 312 is slidably limited to the second circular groove 34. The inner wall of the second circular groove 34 has three moving grooves 35. The slot 33, the second circular groove 34 and the three moving grooves 35 are interconnected. The inner wall of each of the three moving grooves 35 is slidably limited to a wedge 36. The wedge 36 has an inclined groove 361 inside, and the ring 312 is slidably limited to the inclined groove 361. The side of each of the three wedges 36 that is away from each other is fixedly connected to a second spring 362. The end of the second spring 362 that is away from the wedge 36 is fixedly connected to the inner wall of the moving groove 35. First, push the push plate 31, and the ring 312 moves accordingly. Then, insert the pull rod 15 into the slot 33, which will squeeze and push the three wedges 36 away from each other. At the same time, the second spring 362 is squeezed. After the slot 33 is inserted, the second spring 362 pushes with its own elasticity. When the wedge 36 loses its compression, it enters the annular groove 151 and contacts the pull rod 15, locking the pull rod 15. During disassembly, the push plate 31 is pushed down, and the ring 312 enters the inclined groove 361 of the three wedges 36, squeezing and pushing the three wedges 36 away from each other until the ring 312 moves to its limit. At this point, the wedges 36 leave the annular groove 151, and the pull rod 15 can be removed. This mechanism can quickly lock and unlock the pull rod 15, ensuring the stable operation of the broaching process. The inclined groove 361 is adapted to the outer surface of the ring 312, and the sides of the three wedges 36 that are close to each other are all inclined.
[0021] A specific application of this embodiment is as follows: In use, first place the wheel hub centered on the top of the processing table 16. Then, activate the electric push rod 27 to extend and drive the triangular block 271 to move towards the center of the processing table 16. At this time, the inclined surface of the triangular block 271 will squeeze and push the lifting ring 24 upward. At this time, the inner ring of the lifting ring 24 will squeeze and push the four bottom pillars 216 closer to each other. The four arc-shaped blocks 215 follow the movement until they contact the outer surface of the wheel hub. Then, the electric push rod 27 can be turned off. At this time, the four arc-shaped blocks 215 work together to fix the wheel hub centered on the top of the processing table 16. When the bottom pillars 216 move, they will drive the moving rod 21 to move together through the square block 213. At the same time, the annular block 211 and the circular groove 23 work together to compress the spring 212. Then, the hydraulic cylinder 1 can be activated. 1. Extend and drive the lifting plate 13 upward until the lifting plate 13 moves to the limit position. Insert the smooth end of the pull rod 15 into the pre-reserved machining hole of the wheel hub. At the same time, push the push plate 31 upward so that the ring 312 is separated from the contact with the three wedges 36. Then the pull rod 15 will enter the circular groove 25 and be inserted into the slot 33 through the hole at the center of the base plate 28. During the insertion process, the bottom of the pull rod 15 will contact the inclined surface of the three wedges 36, squeezing and pushing the three wedges 36 away from each other. At this time, the spring 362 is compressed until the bottom of the pull rod 15 contacts the bottom of the inner wall of the slot 33. The wedges 36 lose their compression. The three springs 362 push the three wedges 36 closer to each other through their own elasticity and enter the annular groove 151. At this time, the pull rod 15 cannot be pulled out of the slot 33. At this point, the hydraulic cylinder 11 can be activated to slowly retract and drive the lifting plate 13 and the pull rod 15 downwards. A series of cutting teeth on the pull rod 15 sequentially remove a small amount of metal, and the last precision cutting tooth forms the final spline tooth shape and size. After processing, the pull rod 15 has completely detached from the processing table 16. At this point, the push plate 31 can be pressed down, and the ring 312 will move down together. During the downward movement, it will enter the inclined groove 361 of the three wedges 36 and squeeze the inclined groove 361, pushing the three wedges 36 away from each other until the ring 312 moves down to the limit position, at which point all three wedges 36 are separated. After the annular groove 151 is opened, the pull rod 15 can be pulled upwards, and then the push plate 31 can be pushed upwards until the ring 312 is completely out of the inclined groove 361. The second spring 362 pushes the wedge block 36 to reset through its own elastic force. Finally, the electric push rod 27 is activated to retract and drive the triangular block 271 away from the center of the processing table 16. At this time, after the lifting ring 24 loses its compression and pushing, it slowly falls down by its own gravity. After the bottom column 216 loses its compression, the first spring 212 pushes the annular block 211 and the arc block 215 to reset through its own elastic force. Then the wheel hub can be removed.
[0022] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0023] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the present utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.
Claims
1. A high-precision machining and forming device for the center spline hole of an aluminum alloy wheel hub, comprising a base (1), wherein a hydraulic cylinder (11) is installed inside the base (1), two guide rods (12) are fixedly connected to the top of the base (1), a lifting plate (13) is fixedly connected to the top output end of the hydraulic cylinder (11), a fixing column (14) is fixedly connected to the top of the lifting plate (13), a pull rod (15) is provided above the lifting plate (13), and a processing table (16) is fixedly connected to the top of the two guide rods (12), characterized in that, Also includes: A fixing mechanism (2) is installed inside the processing table (16). The fixing mechanism (2) is used to fix the wheel hub. The fixing mechanism (2) includes four arc-shaped blocks (215). A circular groove (25) is opened inside the processing table (16). A lifting ring (24) is slidably limited to the inner wall of the circular groove (25). A triangular block (271) is provided inside the circular groove (25). Locking mechanism (3), which is located inside the fixed column (14), is used to lock the pull rod (15). The triangular block (271) is triangular in shape, and the outer and inner surfaces of the lifting ring (24) are both annular conical surfaces.
2. The high-precision machining and forming device for the center spline hole of an aluminum alloy wheel hub according to claim 1, characterized in that, The lifting plate (13) is slidably limited to the outer surface of the two guide rods (12), and an annular groove (151) is provided at the bottom of the outer surface of the pull rod (15).
3. The high-precision machining and forming device for the center spline hole of an aluminum alloy wheel hub according to claim 1, characterized in that, The fixing mechanism (2) includes four moving rods (21). An annular block (211) is fixedly connected to the outer surface of the moving rod (21). A spring (212) is sleeved on the outer side of the moving rod (21). A block (213) is fixedly connected to the end of each of the four moving rods (21). A top column (214) is fixedly connected to the top of the block (213). The ends of the four arc-shaped blocks (215) that are far apart from each other are fixedly connected to the four top columns (214). A bottom column (216) is fixedly connected to the bottom of the block (213). The arc-shaped block (215) is arc-shaped, and the bottom end of the bottom column (216) is spherical.
4. The high-precision machining and forming device for the center spline hole of an aluminum alloy wheel hub according to claim 1, characterized in that, The locking mechanism (3) includes a push plate (31), a connecting rod (311) is fixedly connected to the side of the push plate (31) near the fixed post (14), a ring (312) is fixedly connected to the end of the connecting rod (311) near the fixed post (14), a lifting groove (32) is provided on the outer surface of the fixed post (14), and the connecting rod (311) and the lifting groove (32) are slidably limited to each other.
5. The high-precision machining and forming device for the center spline hole of an aluminum alloy wheel hub according to claim 3, characterized in that, The processing table (16) has four square slots (22) on its top. The square block (213) is slidably limited to the square slots (22). The processing table (16) has four circular slots (23) inside. The annular block (211) is slidably limited to the circular slots (23). The moving rod (21) is slidably limited to the inside of the processing table (16). One end of the spring (212) is fixedly connected to the annular block (211), and the other end of the spring (212) is fixedly connected to the inner wall of the circular slot (23). Four support rods (241) are fixedly connected to the outer surface of the lifting ring (24). The inner wall of the circular slot (25) has four limiting slots (242), and the support rods (241) are slidably limited to the limiting slots (242). The square groove (22) and the circular groove (23) are interconnected.
6. The high-precision machining and forming device for the center spline hole of an aluminum alloy wheel hub according to claim 5, characterized in that, The inner wall of the circular groove (25) is provided with a receiving groove (26). An electric push rod (27) is fixedly connected inside the processing table (16). The output end of the electric push rod (27) is fixedly connected to the side of the triangular block (271) near the electric push rod (27). The triangular block (271) is slidably limited to the receiving groove (26). A base plate (28) is fixedly connected to the bottom of the processing table (16). The receiving groove (26) is connected to the circular groove (25).
7. The high-precision machining and forming device for the center spline hole of an aluminum alloy wheel hub according to claim 4, characterized in that, The top of the fixed column (14) is provided with a slot (33), the pull rod (15) is inserted into the slot (33), the inside of the fixed column (14) is provided with a circular groove (34), the ring (312) is slidably limited to the circular groove (34), and the inner wall of the circular groove (34) is provided with three moving grooves (35). The slot (33), the second circular slot (34), and the three movable slots (35) are interconnected.
8. The high-precision machining and forming device for the center spline hole of an aluminum alloy wheel hub according to claim 7, characterized in that, The inner walls of the three movable grooves (35) are all fitted with wedges (36) for sliding and limiting. The wedges (36) have inclined grooves (361) inside. The ring (312) is fitted with the inclined grooves (361) for sliding and limiting. The sides of the three wedges (36) that are far apart from each other are all fixedly connected with springs (362). The end of the springs (362) that is far away from the wedges (36) is fixedly connected to the inner wall of the movable grooves (35). The inclined groove (361) is adapted to the outer surface of the ring (312), and the three wedges (36) are all inclined on the side that is close to each other.