Hub positioning tool and machining method

Abstract

The invention provides a hub positioning tool which comprises a machine tool assembly, a clamping assembly, a mounting assembly and a limiting assembly, the clamping assembly comprises a bottom plate, a center positioning assembly, a special-shaped positioning seat, a hinge pressing mechanism, a main pressing mechanism and an auxiliary pressing mechanism are fixedly mounted on the surface of the bottom plate, and the mounting assembly is fixedly mounted at the bottom of the bottom plate; the limiting assembly is fixedly connected to the bottom end of the mounting assembly. According to the hub mounting and fixing device, the multiple clamping assemblies are mounted and fixed through the bottom plate, the hub is preliminarily fixed through center positioning, further limiting is achieved after the hub is mounted through cooperation of the mounting assembly and the limiting assembly, it is ensured that the hub is accurately positioned through the clamping assemblies after being stabilized, meanwhile, the hub can be conveniently and rapidly disassembled and assembled, and the mounting efficiency is improved. And meanwhile, the mounting assembly can be used for subsequent cooling liquid flow guiding, the clamping assembly is used for conducting pressing and fixing in the angular direction and the vertical direction, and the stability of the hub after positioning is improved.

Description

Technical Field

[0001] The invention relates to a wheel hub positioning tool and a processing method, belonging to the technical field of wheel hub processing. Background Art

[0002] A wheel hub, also known as a rim, wheel, or wheel rim, is a cylindrical metal component mounted centrally on an axle, supporting the tire's inner profile. Wheel hubs come in a wide variety of styles, depending on their diameter, width, molding method, and material. Surface treatments vary depending on the characteristics and requirements of each vehicle model, broadly categorized as painting or electroplating. In the past, the most common wheel hub bearings for passenger cars used pairs of single-row tapered roller or ball bearings. With technological advancements, wheel hub units have become widely used in passenger cars. The use and volume of wheel hub bearing units have steadily increased, reaching their third generation. The first generation consisted of double-row angular contact bearings. The second generation featured a flange on the outer raceway to secure the bearings, allowing the bearings to be simply screwed onto the axle and secured with nuts, facilitating vehicle maintenance. The third generation integrates the bearing unit with an anti-lock brake system. The wheel hub unit consists of an inner flange and an outer flange. The inner flange is bolted to the drive shaft, while the outer flange holds the entire bearing together.

[0003] The wheel hub is an important metal component that supports the car wheel. After the wheel hub is produced, it often has defects and needs further fine processing. Due to the complexity of the components of the wheel hub, deviations are easy to occur during positioning. During batch automated processing, inaccurate positioning can easily lead to reduced subsequent processing accuracy, making it difficult to perform high-precision processing on the wheel hub. Further positioning will also cause inconvenience in disassembly and assembly due to excessive use of positioning fixtures, affecting processing efficiency. Summary of the Invention

[0004] The present invention provides a wheel hub positioning tool and a processing method in order to solve the technical problems of low positioning accuracy and inconvenient assembly and disassembly during wheel hub processing.

[0005] The present invention solves the above technical problems through the following technical solutions: The present invention provides a wheel hub positioning tool, which is applied to a machine tool assembly. The machine tool assembly includes a base. The wheel hub positioning tool includes: A base, fixedly connected to the surface of the base, with fixing seats fixedly installed at both ends of the base; The clamping assembly includes a base plate, which is arranged between two fixing seats, and the center positioning assembly, the anisotropic positioning seat, the hinge pressing mechanism, the main pressing mechanism and the auxiliary pressing mechanism are fixedly installed on the surface of the base plate; The mounting assembly and the limiting assembly are fixedly mounted to the bottom of the base plate, the mounting assembly passes through the center positioning assembly, the limiting assembly is fixedly connected to the bottom end of the mounting assembly, the limiting assembly is inserted through the inside of the mounting assembly, and the limiting assembly extends to the inside of the center positioning assembly.

[0006] In this technical solution, a disc is provided on the inner wall of the fixed seat, and the disc is rotatably connected to the bearing component inside the fixed seat, and a driving device connected to the disc is provided on the outer wall of the fixed seat. An L-shaped support plate is fixedly installed on the side wall of the disc. There are two support plates, and both of the support plates are fixedly connected to the two ends of the base plate by screws.

[0007] In this technical solution, two central positioning columns are provided on the surface of the base plate, and a hinge clamping mechanism, a main clamping mechanism, an auxiliary clamping mechanism and a plurality of special-shaped positioning seats are respectively provided on the surface of the base plate around the positioning columns. The hinge clamping mechanism, the main clamping mechanism, the auxiliary clamping mechanism and the plurality of special-shaped positioning seats are all fixedly connected to the base plate by screws.

[0008] In this technical solution, the main clamping mechanism consists of an oil cylinder, a clamping rod, a connecting rod and a clamping claw. The oil cylinder is fixedly installed to the top surface of the base plate. The telescopic end of the oil cylinder telescopes in the vertical direction and is rotatably connected to one end of the clamping rod. The clamping rod is an L-shaped structure. The middle part of the clamping rod is rotatably connected to the connecting rod, and the other end of the connecting rod is rotatably connected to the main cylinder body of the oil cylinder. The other end of the clamping rod is fixedly connected to the clamping claw.

[0009] In the present technical solution, the auxiliary clamping mechanism has the same structure as the hinge clamping mechanism and the main clamping mechanism. The clamping claw on the auxiliary clamping mechanism is a V-shaped structure, the clamping claw on the main clamping mechanism is a bent structure, and the telescopic ends of the cylinders of the main clamping mechanism and the auxiliary clamping mechanism are oriented in the same direction, and the cylinder of the hinge clamping mechanism is telescopic in the horizontal direction.

[0010] In the present technical solution, the center positioning assembly is composed of a center positioning column with an annular structure, and the center positioning column is fixed to the inside of the base plate by a hexagon socket bolt. The surface of the center positioning column is sleeved with a hub workpiece, and the hinge clamping mechanism, the main clamping mechanism, the auxiliary clamping mechanism and a plurality of special-shaped positioning seats are all arranged around the center positioning column, and the special-shaped positioning seats are staggered between the hinge clamping mechanism, the main clamping mechanism and the auxiliary clamping mechanism.

[0011] In the present technical solution, a number of movable rods are inserted through the top of the center positioning column, and the several movable rods are evenly arranged on the edge of the center positioning column. Both ends of each movable rod are fixedly connected to the end of the semicircular structure, one of the ends is connected to the inside of the center positioning column through a spring, the spring is sleeved on the surface of the movable rod, and the other end extends to the inside of the center positioning column.

[0012] In the present technical solution, the mounting assembly includes a mounting plate and a shell, a filter screen is provided in the middle of the mounting plate, the mounting plate is fixedly mounted to the bottom surface of the base plate, the mounting plate is correspondingly arranged below the center positioning column, the shell is fixedly mounted to the bottom end of the mounting plate, the bottom end of the shell is an inward concave structure, the inner bottom surface of the shell is fixedly connected to a sealing ring of an annular structure, and a flow guide pipe is connected through the bottom of the shell.

[0013] In the present technical solution, the limiting assembly consists of a fixed plate and a stepper motor, the fixed plate is fixedly installed to the bottom of the shell, the stepper motor is fixedly connected to the bottom of the fixed plate, the output end of the stepper motor is fixedly connected to a drive shaft, and the drive shaft passes through the shell and the mounting plate respectively and extends to the inside of the center positioning column, the surface of the drive shaft is fixedly connected to a guide plate located inside the shell, the guide plate is a bowl-shaped structure and is located on the bottom of the shell, and the guide plate is in contact with the sealing ring, the top end of the drive shaft is fixedly connected to a turntable, the edge of the turntable is provided with a number of grooves with the same number as the movable rods, and the inner wall of the groove is in contact with the end head.

[0014] The present invention also provides a method for processing a wheel hub positioning tool, the method comprising the following steps: (1) Pre-installation and positioning of the wheel hub: The wheel hub workpiece is sleeved on the surface of the central positioning column, and the special-shaped positioning seat is used to limit the specific position of the wheel hub workpiece. The stepper motor is started to drive the drive shaft and the turntable to rotate synchronously. The groove on the edge of the turntable squeezes the end and pushes the movable rod to move. The movable rod overcomes the elasticity of the spring and drives the end to press against the inner wall of the wheel hub workpiece to achieve pre-installation positioning; (2) Positioning the outer contour of the wheel hub: first start the hinge clamping mechanism, use the horizontal extension of the telescopic end of the oil cylinder to drive the clamping rod to press against the wheel hub workpiece, so that it rests on the special-shaped positioning seat to achieve angular positioning, then start the main clamping mechanism, use the clamping claws at the telescopic end of the oil cylinder to press the top surface of the wheel hub workpiece, and finally start the auxiliary clamping mechanism to make the clamping claws further press and fix the wheel hub workpiece; (3) Machine tool processing: the wheel hub workpiece is processed using the machining tool on the machine tool side. The support plate can be installed and fixed to the base plate, and the support plate and the base plate can be rotated around the disc to achieve multi-axis processing to process the complex position of the wheel hub workpiece; (4) Coolant diversion: Coolant is sprayed on the hub workpiece processing position to cool it down. When the coolant flows in the center positioning column, it overflows from the mounting plate. The concave structure at the bottom of the shell is used to achieve smooth coolant diversion, and the guide plate and the sealing ring are fitted to avoid coolant leakage. When the stepper motor drives the guide plate on the drive shaft to rotate, the guide plate and the sealing ring are always effectively fitted, and the coolant is completely discharged from the guide pipe for collection.

[0015] On the basis of conforming to the common sense in this field, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.

[0016] The positive progress effect of the present invention is: The above-mentioned wheel hub positioning tooling and processing method adopts a base plate to realize the installation and fixation of multiple clamping components, adopts center positioning to realize the initial fixation of the wheel hub, and realizes further limiting of the wheel hub after installation through the cooperation of the installation component and the limit component, ensuring that the wheel hub is stable and then accurately positioned by the clamping component. At the same time, it is convenient for the convenient disassembly and assembly of the wheel hub, and also convenient for the effective fixation of the wheel hub during installation and positioning. At the same time, the installation component can be used for subsequent coolant diversion, which will not cause the problem of ineffective discharge of coolant and will not affect the drive of the limit component, thereby improving processing convenience. After the wheel hub is pre-installed by multi-point control, the clamping component is used to press and fix the angular and vertical positions, thereby improving the stability of the wheel hub after positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention.

[0018] Figure 2 For the present invention Figure 1 Schematic diagram of the locally enlarged structure at point A in the middle.

[0019] Figure 3 It is a schematic diagram of the partial three-dimensional structure of the central positioning column of the present invention.

[0020] Figure 4 For the present invention Figure 3 Schematic diagram of the locally enlarged structure at point B in the middle.

[0021] Figure 5 It is a schematic diagram of the half-section structure of the present invention.

[0022] Figure 6 For the present invention Figure 5 Schematic diagram of the partially enlarged structure at point C in the middle.

[0023] Figure 7 It is a schematic diagram of the external top view structure of the present invention.

[0024] Figure 8 It is a schematic diagram of the external front view structure of the present invention.

[0025] Figure 9 This is a schematic diagram of the top view of the central positioning column of the present invention.

[0026] Figure 10 It is a schematic diagram of the internal local structure of the hub workpiece of the present invention.

[0027] Description of Reference Numerals 10. Machine tool assembly; 11. Base; 12. Base; 13. Fixed seat; 14. Disc; 15. Pallet; 20. Clamping assembly; 21. Bottom plate; 22. Special-shaped positioning seat; 23. Hinge clamping mechanism; 24. Main clamping mechanism; 25. Auxiliary clamping mechanism; 251. Oil cylinder; 252. Clamping rod; 253. Connecting rod; 254. Clamping claw; 30. Center positioning assembly; 31. Center positioning column; 32. Hexagon socket bolt; 33. Hub workpiece; 34. Movable rod; 35. End; 36. Spring; 40. Mounting assembly; 41. Mounting plate; 42. Housing; 43. Flow guide tube; 44. Sealing ring; 50. Limiting assembly; 51. Fixing plate; 52. Stepping motor; 53. Driving shaft; 54. Guide plate; 55. Turntable; 56. Groove. DETAILED DESCRIPTION

[0028] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0029] like Figure 1-10 As shown, a hub positioning tool is applied to a machine tool assembly 10, the machine tool assembly 10 includes a base 11, and the hub positioning tool includes: The base 12 is fixedly connected to the surface of the base 11. The base 12 is installed by sliding the slide at its bottom and the groove on the surface of the base 11. After the base 12 and the base 11 are aligned, they are fastened and fixed with screws to form a whole. Fixed seats 13 are fixed at both ends of the base 12; the two fixed seats 13 are opposite to each other.

[0030] The clamping assembly 20 can be used for positioning the hub workpiece 33 after installation. A plurality of clamps are provided on the clamping assembly 20 for clamping and fixing the hub workpiece 33 at various positions. The clamping assembly 20 includes a base plate 21, which is provided between the two fixing seats 13. Centering assemblies 30 are fixedly installed on the surface of the base plate 21. The centering assemblies 30 are used for preliminary positioning of the center of the hub workpiece 33 during the initial installation, and then the edges thereof are pressed and limited by the clamping assembly 20, the anisotropic positioning seats, the hinge pressing mechanism 23, the main pressing mechanism 24 and the auxiliary pressing mechanism 25. The mounting assembly 40 and the limiting assembly 50 are used to fix the mounting assembly 40 to the bottom of the base plate 21, and the limiting assembly 50 can be fixed to the bottom of the base plate 21 through the mounting assembly 40. At the same time, the cooling water in the mounting assembly 40 can be used to guide the cooling water to discharge excess coolant. The limiting assembly 50 is fixed to the bottom of the mounting assembly 40 and can drive the turntable 55 to rotate. The turntable 55 is used to press against the movable rod 34 to realize the center positioning of the hub workpiece 33. The mounting assembly 40 is fixedly installed to the bottom of the base plate 21. The mounting assembly 40 passes through the center positioning assembly 30. The limiting assembly 50 is fixedly connected to the bottom end of the mounting assembly 40. The limiting assembly 50 is inserted into the inside of the mounting assembly 40, and the limiting assembly 50 extends to the inside of the center positioning assembly 30.

[0031] A disc 14 is provided on the inner wall of the fixing seat 13 facing the center positioning component 30, and the disc 14 is rotatably connected to the bearing component inside the fixing seat 13, and a driving device connected to the disc 14 is provided on the outer wall of the fixing seat 13 opposite to the inside. An L-shaped support plate 15 is fixedly installed on the side wall of the disc 14 facing the center positioning component 30. There are two support plates 15, and the two support plates 15 are respectively fixedly connected to the two ends of the base plate 21 by screws, and the two support plates 15 are symmetrical.

[0032] In this technical solution, the support plate 15 is used to install the base plate 21, and the driving disc 14 can drive the support plate 15 and the base plate 21 to rotate synchronously, so as to achieve angle adjustment of the fixed hub workpiece 33 after rotation to adapt to processing at different arbitrary angles.

[0033] Two central positioning columns 31 are provided on the surface of the bottom plate 21, and a hinge clamping mechanism 23, a main clamping mechanism 24, an auxiliary clamping mechanism 25 and a plurality of special-shaped positioning seats 22 are respectively provided on the surface of the bottom plate 21 around the positioning columns. The hinge clamping mechanism 23, the main clamping mechanism 24, the auxiliary clamping mechanism 25 and the plurality of special-shaped positioning seats 22 are fixedly connected to the bottom plate 21 by screws; the main clamping mechanism 24 is composed of an oil cylinder 251, a clamping rod 252, a connecting rod 253 and a clamping claw 254. The oil cylinder 251 is fixedly mounted to the top surface of the bottom plate 21, and the telescopic end of the oil cylinder 251 is telescopic in the vertical direction and rotates with one end of the clamping rod 252 The connection is that the clamping rod 252 is an L-shaped structure, the middle part of the clamping rod 252 is rotatably connected to the connecting rod 253, and the other end of the connecting rod 253 is rotatably connected to the main cylinder body of the oil cylinder 251, and the other end of the clamping rod 252 is fixedly connected with the clamping claw 254; the auxiliary clamping mechanism 25 has the same structure as the hinge clamping mechanism 23 and the main clamping mechanism 24, the clamping claw 254 on the auxiliary clamping mechanism 25 is a V-shaped structure, the clamping claw 254 on the main clamping mechanism 24 is a bent structure, and the telescopic ends of the oil cylinder 251 of the main clamping mechanism 24 and the auxiliary clamping mechanism 25 are oriented in the same direction, and the oil cylinder 251 of the hinge clamping mechanism 23 is telescopic in the horizontal direction.

[0034] In this technical solution, the center positioning column 31 is used to perform the preliminary fixation of the hub workpiece 33. During the preliminary fixation, the hub workpiece 33 is placed on the center positioning column 31. The movable rod 34 in the center positioning column 31 drives the end 35 to press against the inner wall of the hub workpiece 33 to achieve preliminary fixation, and relies on multiple special-shaped positioning seats 22 to achieve initial limit. When the hub workpiece 33 is placed on the center positioning column 31, multiple special-shaped positioning seats 22 press against the corresponding positions of the hub workpiece 33, and the initial limit can be achieved at this time. After the pre-installation and positioning of the installation component 40 and the limiting component 50, the pre-installation positioning is the initial fixation through the center positioning column 31 and the initial limiting state through the special-shaped positioning seat 22. The oil cylinder 251 of the hinge clamping mechanism 23 is horizontally extended and retracted to drive the hub workpiece 33 to press against the special-shaped positioning seat 22. After the hub workpiece 33 is clamped by the main clamping mechanism 24, it is clamped and fixed again by the auxiliary clamping mechanism 25 to achieve stable limiting of the hub workpiece 33 and ensure its positioning stability performance.

[0035] The center positioning assembly 30 is composed of a center positioning column 31 of an annular structure, and the center positioning column 31 is fixedly installed to the inside of the base plate 21 by an inner hexagonal bolt 32. The surface of the center positioning column 31 is sleeved with a hub workpiece 33, and the hinge clamping mechanism 23, the main clamping mechanism 24 and the auxiliary clamping mechanism 25 and a plurality of special-shaped positioning seats 22 are all arranged around the center positioning column 31, and the special-shaped positioning seats 22 are staggered between the hinge clamping mechanism 23, the main clamping mechanism 24 and the auxiliary clamping machine; a number of movable rods 34 are inserted through the top of the center positioning column 31, and the several movable rods 34 are evenly arranged on the edge of the center positioning column 31. Both ends of each movable rod 34 are fixedly connected to the end 35 of the semicircular structure, one of the ends 35 is connected to the inside of the center positioning column 31 through a spring 36, the spring 36 is sleeved on the surface of the movable rod 34, and the other end 35 extends to the inside of the center positioning column 31.

[0036] In this technical solution, the outer diameter of the center positioning column 31 is smaller than the inner diameter of the middle part of the hub workpiece 33, which can facilitate the smooth installation of the hub workpiece 33 on the center positioning column 31, and then multiple end heads 35 are used to fix the inner wall of the hub workpiece 33 at multiple points to ensure stable limiting for subsequent processing.

[0037] The mounting assembly 40 includes a mounting plate 41 and a shell 42. A filter screen is provided in the middle of the mounting plate 41. The mounting plate 41 is fixedly mounted to the bottom surface of the base plate 21. The mounting plate 41 is correspondingly arranged below the center positioning column 31. The shell 42 is fixedly mounted to the bottom end of the mounting plate 41. The bottom end of the shell 42 is a concave structure. A sealing ring 44 of an annular structure is fixedly connected to the bottom surface of the shell 42. A guide tube 43 is connected to the bottom of the shell 42. The limiting assembly 50 consists of a fixing plate 51 and a stepper motor 52. The fixing plate 51 is fixedly mounted to the bottom of the shell 42. The stepper motor 52 is fixed to the fixing plate 51. The bottom of the fixed plate 51 is fixedly connected, and the output end of the stepper motor 52 is fixedly connected to the drive shaft 53, and the drive shaft 53 passes through the shell 42 and the mounting plate 41 respectively and extends to the inside of the center positioning column 31. The surface of the drive shaft 53 is fixedly connected to a guide plate 54 located inside the shell 42. The guide plate 54 is a bowl-shaped structure and is located on the bottom surface of the shell 42, and the guide plate 54 is in contact with the sealing ring 44. The top of the drive shaft 53 is fixedly connected to a turntable 55. The edge of the turntable 55 is provided with a number of grooves 56 with the same number as the movable rod 34, and the inner wall of the groove 56 is in contact with the end head 35.

[0038] In this technical solution, the shell 42 is fixed to the bottom of the base plate 21 through the mounting plate 41. The shell 42 can guide the coolant. When part of the coolant flows down to the center positioning component 30 during processing, the coolant flows down through the filter in the middle of the mounting plate 41 and enters the interior of the shell 42. The concave structure at the bottom of the shell 42 allows the coolant to be guided smoothly and discharged through the guide pipe 43. At the same time, the sealing ring 44 and the guide plate 54 are arranged to cooperate to achieve sealing at the connection between the shell 42 and the drive shaft 53 without affecting the rotation of the drive shaft 53.

[0039] Furthermore, when the stepper motor 52 drives the drive shaft 53 to rotate, the guide plate 54 rotates on the surface of the sealing ring 44. At the same time, the drive shaft 53 rotates in the mounting plate 41 and drives the disc 14 to rotate. When the end head 35 moves out from the inside of the groove 56, the end head 35 pushes the movable rod 34 outward, and then presses against the inner wall of the hub workpiece 33. When the stepper motor 52 rotates in the opposite direction, the end head 35 re-enters the groove 56, and the elasticity of the spring 36 can drive the movable rod 34 to reset. At this time, the hub workpiece 33 can be easily removed, and the hub workpiece 33 can be conveniently disassembled and assembled.

[0040] A method for processing a wheel hub positioning tool comprises the following steps: (1) Pre-installation and positioning of the wheel hub: the wheel hub workpiece 33 is sleeved on the surface of the central positioning column 31, and the special-shaped positioning seat 22 is used to limit the specific position of the wheel hub workpiece 33. The stepper motor 52 is started to drive the drive shaft 53 and the turntable 55 to rotate synchronously. The groove 56 on the edge of the turntable 55 squeezes the end head 35 and pushes the movable rod 34 to move. The movable rod 34 overcomes the elasticity of the spring 36 and drives the end head 35 to press against the inner wall of the wheel hub workpiece 33 to achieve pre-installation and positioning; (2) Positioning the outer contour of the hub: first start the hinge clamping mechanism 23, and use the horizontal extension of the telescopic end of the oil cylinder 251 to drive the clamping rod 252 to press against the hub workpiece 33, so that it rests on the special-shaped positioning seat 22 to achieve angular positioning, then start the main clamping mechanism 24, and use the clamping claw 254 at the telescopic end of the oil cylinder 251 to press the top surface of the hub workpiece 33, and finally start the auxiliary clamping mechanism 25 to make the clamping claw 254 further press and fix the hub workpiece 33; (3) Machine tool processing: The wheel hub workpiece 33 is processed using a machining tool on the machine tool side. The support plate 15 can be installed and fixed to the base plate 21. The support plate 15 and the base plate 21 can be rotated around the disc 14 to achieve multi-axis processing to process complex positions of the wheel hub workpiece 33; (4) Coolant diversion: Coolant is sprayed on the processing position of the hub workpiece 33 to cool it down. When the coolant flows in the center positioning column 31, it overflows from the mounting plate 41. The concave structure at the bottom of the shell 42 is used to achieve smooth coolant diversion, and the guide plate 54 and the sealing ring 44 are fitted together to avoid coolant leakage. When the stepper motor 52 drives the guide plate 54 on the drive shaft 53 to rotate, the effective fit between the guide plate 54 and the sealing ring 44 is always ensured, and the coolant is completely discharged from the guide pipe 43 for collection.

[0041] The present invention is not limited to the above-described embodiments. Any changes in shape or structure fall within the scope of protection of the present invention. The scope of protection of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention. Such changes and modifications shall fall within the scope of protection of the present invention.

Claims

1. A wheel hub positioning tool, characterized in that: Applied to a machine tool assembly (10), the machine tool assembly (10) includes a base (11), and the hub positioning tool includes: A base (12) is fixedly connected to the surface of the base (11), and fixed seats (13) are fixedly installed at both ends of the base (12); A clamping assembly (20), the clamping assembly (20) comprising a base plate (21), the base plate (21) being arranged between two fixing seats (13), and a center positioning assembly (30), an anisotropic positioning seat, a hinge pressing mechanism (23), a main pressing mechanism (24), and an auxiliary pressing mechanism (25) being fixedly mounted on a surface of the base plate (21); The mounting assembly (40) and the limiting assembly (50) are fixedly mounted to the bottom of the base plate (21), the mounting assembly (40) passes through the center positioning assembly (30), the limiting assembly (50) is fixedly connected to the bottom end of the mounting assembly (40), the limiting assembly (50) is inserted through the inside of the mounting assembly (40), and the limiting assembly (50) extends into the inside of the center positioning assembly (30).

2. The wheel hub positioning tool according to claim 1, characterized in that: The inner wall of the fixing seat (13) is provided with a disc (14), the disc (14) is rotatably connected to the bearing component inside the fixing seat (13), and the outer wall of the fixing seat (13) is provided with a driving device connected to the disc (14), and the side wall of the disc (14) is fixedly mounted with an L-shaped support plate (15), the number of the support plates (15) is two, and the two support plates (15) are fixedly connected to the two ends of the bottom plate (21) through screws.

3. The wheel hub positioning tool according to claim 1, characterized in that: Two central positioning columns (31) are provided on the surface of the base plate (21), and a hinge pressing mechanism (23), a main pressing mechanism (24), an auxiliary pressing mechanism (25) and a plurality of special-shaped positioning seats (22) are respectively provided on the surface of the base plate (21) around the positioning columns. The hinge pressing mechanism (23), the main pressing mechanism (24), the auxiliary pressing mechanism (25) and the plurality of special-shaped positioning seats (22) are all fixedly connected to the base plate (21) by screws.

4. The wheel hub positioning tool according to claim 3, characterized in that: The main clamping mechanism (24) is composed of an oil cylinder (251), a clamping rod (252), a connecting rod (253) and a clamping claw (254). The oil cylinder (251) is fixedly mounted to the top surface of the base plate (21). The telescopic end of the oil cylinder (251) telescopes in the vertical direction and is rotatably connected to one end of the clamping rod (252). The clamping rod (252) is an L-shaped structure. The middle part of the clamping rod (252) is rotatably connected to the connecting rod (253), and the other end of the connecting rod (253) is rotatably connected to the main cylinder body of the oil cylinder (251). The other end of the clamping rod (252) is fixedly connected to the clamping claw (254).

5. The wheel hub positioning tool according to claim 3, characterized in that: The auxiliary pressing mechanism (25) has the same structure as the hinge pressing mechanism (23) and the main pressing mechanism (24); the clamping claw (254) on the auxiliary pressing mechanism (25) is a V-shaped structure, the clamping claw (254) on the main pressing mechanism (24) is a bent structure, and the telescopic ends of the oil cylinders (251) of the main pressing mechanism (24) and the auxiliary pressing mechanism (25) are oriented in the same direction, and the oil cylinder (251) of the hinge pressing mechanism (23) telescopes in the horizontal direction.

6. The wheel hub positioning tool according to claim 1, characterized in that: The center positioning assembly (30) is composed of a center positioning column (31) of an annular structure. The center positioning column (31) is fixed to the inside of the base plate (21) by a hexagon socket bolt (32). A hub workpiece (33) is sleeved on the surface of the center positioning column (31). A hinge clamping mechanism (23), a main clamping mechanism (24), an auxiliary clamping mechanism (25) and a plurality of special-shaped positioning seats (22) are all arranged around the center positioning column (31), and the special-shaped positioning seats (22) are staggered between the hinge clamping mechanism (23), the main clamping mechanism (24) and the auxiliary clamping mechanism.

7. The wheel hub positioning tool according to claim 6, characterized in that: A plurality of movable rods (34) are inserted through the top of the center positioning column (31), and the plurality of movable rods (34) are evenly arranged on the edge of the center positioning column (31). Both ends of each movable rod (34) are fixedly connected to the end (35) of the semicircular structure, one of the end (35) is connected to the inside of the center positioning column (31) through a spring (36), and the spring (36) is sleeved on the surface of the movable rod (34), and the other end (35) extends to the inside of the center positioning column (31).

8. The wheel hub positioning tool according to claim 1, characterized in that: The mounting assembly (40) includes a mounting plate (41) and a shell (42). A filter screen is provided in the middle of the mounting plate (41). The mounting plate (41) is fixedly mounted to the bottom surface of the base plate (21). The mounting plate (41) is correspondingly arranged below the central positioning column (31). The shell (42) is fixedly mounted to the bottom end of the mounting plate (41). The bottom end of the shell (42) is an inward concave structure. A sealing ring (44) of an annular structure is fixedly connected to the inner bottom surface of the shell (42). A guide pipe (43) is connected through the bottom of the shell (42).

9. The wheel hub positioning tool according to claim 1, characterized in that: The limiting assembly (50) is composed of a fixing plate (51) and a stepper motor (52), wherein the fixing plate (51) is fixedly mounted to the bottom of the housing (42), and the stepper motor (52) is fixedly connected to the bottom of the fixing plate (51). The output end of the stepper motor (52) is fixedly connected to a driving shaft (53), and the driving shaft (53) passes through the housing (42) and the mounting plate (41) respectively and extends to the inside of the central positioning column (31). The surface of the driving shaft (53) is fixedly connected to a guide plate (54) located inside the housing (42), and the guide plate (54) is a bowl-shaped structure and is located on the bottom surface of the housing (42), and the guide plate (54) is in contact with the sealing ring (44). The top end of the driving shaft (53) is fixedly connected to a turntable (55), and the edge of the turntable (55) is provided with a plurality of grooves (56) having the same number as the movable rod (34), and the inner wall of the groove (56) is in contact with the end (35).

10. A wheel hub processing method based on the wheel hub positioning tool according to any one of claims 1 to 9, characterized in that: The processing method comprises the following steps: (1) Pre-installation positioning of the wheel hub: the wheel hub workpiece (33) is sleeved on the surface of the central positioning column (31), and the special-shaped positioning seat (22) is used to limit the specific position of the wheel hub workpiece (33). The stepper motor (52) is started to drive the drive shaft (53) and the turntable (55) to rotate synchronously. The groove (56) on the edge of the turntable (55) squeezes the end head (35) and pushes the movable rod (34) to move. The movable rod (34) overcomes the elasticity of the spring (36) and drives the end head (35) to press against the inner wall of the wheel hub workpiece (33) to achieve pre-installation positioning; (2) Positioning the outer contour of the wheel hub: first, start the hinge clamping mechanism (23), use the horizontal extension of the telescopic end of the oil cylinder (251) to drive the clamping rod (252) to press against the wheel hub workpiece (33), so that it presses against the special-shaped positioning seat (22) to achieve angular positioning, then start the main clamping mechanism (24), use the clamping claw (254) at the telescopic end of the oil cylinder (251) to press the top surface of the wheel hub workpiece (33), and finally start the auxiliary clamping mechanism (25) to make the clamping claw (254) further press and fix the wheel hub workpiece (33); (3) machining the hub workpiece (33) using a machining tool on the machine tool side, the support plate (15) can be mounted and fixed on the base plate (21), and the support plate (15) and the base plate (21) can be rotated around the disc (14) to achieve multi-axis machining to process complex positions of the hub workpiece (33); (4) Coolant diversion: Coolant is sprayed on the processing position of the hub workpiece (33) to cool it down. When the coolant flows in the center positioning column (31), it overflows from the mounting plate (41). The concave structure at the bottom of the shell (42) is used to achieve smooth coolant diversion, and the guide plate (54) and the sealing ring (44) are arranged to fit together to avoid coolant leakage. When the stepper motor (52) mobilizes the guide plate (54) on the drive shaft (53) to rotate, the guide plate (54) and the sealing ring (44) are always effectively fitted together, and the coolant is completely discharged from the guide pipe (43) for collection.

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