A hub positioning tool and machining method

Abstract

The application 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, and a center positioning assembly, a special-shaped positioning seat, a hinge pressing mechanism, a main pressing mechanism and an auxiliary pressing mechanism are fixedly installed on the surface of the bottom plate respectively, the mounting assembly is fixedly installed at the bottom of the bottom plate, and the limiting assembly is fixedly connected to the bottom end of the mounting assembly. The application realizes the installation and fixation of multiple clamping assemblies by using the bottom plate, realizes the preliminary fixation of the hub by using the center positioning, realizes the further limiting of the hub after installation by the cooperation of the mounting assembly and the limiting assembly, ensures the accurate positioning of the hub by the clamping assembly after the stable hub, and facilitates the convenient disassembly and assembly of the hub, and facilitates the effective fixation of the hub during installation and positioning, meanwhile, the mounting assembly can be used for subsequent cooling liquid flow guide, the clamping assembly is used for the pressing fixation of the angular and vertical positions, and the stability of the hub after positioning is improved.

Description

Technical Field

[0001] This invention relates to a wheel hub positioning fixture and processing method, belonging to the field of wheel hub processing technology. Background Technology

[0002] A wheel hub, also called a rim, steel rim, wheel, or tire rim, is a cylindrical metal component that supports the tire and is centrally mounted on an axle. Wheel hubs come in many varieties depending on their diameter, width, molding method, and materials. Depending on the characteristics and needs of different car models, wheel hub surface treatments also vary, broadly categorized as baking paint and electroplating. Historically, passenger car wheel bearings were mostly paired single-row tapered roller or ball bearings. With technological advancements, passenger cars now widely use wheel hub units. The application and usage of wheel hub bearing units have increased significantly, evolving to the third generation: the first generation consisted of double-row angular contact bearings. The second generation had a flange on the outer raceway for securing the bearing, allowing for simple mounting of the bearing onto the axle with a nut, simplifying car maintenance. The third generation wheel hub bearing units integrate the bearing unit with an anti-lock braking system (ABS). The wheel hub unit is designed with an inner and outer flange; the inner flange is bolted to the drive shaft, while the outer flange mounts the entire bearing assembly.

[0003] Wheel hubs are important metal components that support car wheels. After production, wheel hubs often have defects that require further precision processing. Due to the complexity of wheel hub components, deviations can easily occur during positioning. In batch automated processing, inaccurate positioning can easily lead to reduced processing accuracy in subsequent processes, making it difficult to perform high-precision processing on wheel hubs. Furthermore, the use of too many positioning fixtures during further positioning can cause inconvenience in disassembly and assembly, affecting processing efficiency. Summary of the Invention

[0004] To address the technical problems of low positioning accuracy and inconvenient disassembly and assembly during wheel hub processing, this invention provides a wheel hub positioning fixture and processing method.

[0005] The present invention solves the above-mentioned technical problems through the following technical solutions:

[0006] This invention provides a hub positioning fixture applied to a machine tool assembly, the machine tool assembly including a base, and the hub positioning fixture comprising:

[0007] A base is fixedly connected to the surface of the base, and a fixing seat is fixedly installed at both ends of the base;

[0008] A clamping assembly, comprising a base plate disposed between two fixed seats, wherein a center positioning assembly, a non-directional positioning seat, a hinge clamping mechanism, a main clamping mechanism, and an auxiliary clamping mechanism are respectively fixedly mounted on the surface of the base plate;

[0009] The mounting assembly is fixedly installed at the bottom of the bottom plate, penetrates the center positioning assembly, and the limiting assembly is fixedly connected to the bottom end of the mounting assembly, penetrates the inside of the mounting assembly, and extends into the inside of the center positioning assembly.

[0010] In the technical solution, the inner wall of the fixing seat is provided with a disc which is rotationally connected with a bearing part inside the fixing seat, and the outer wall of the fixing seat is provided with a driving device connected with the disc.

[0011] In the technical solution, the surface of the bottom plate is provided with two center positioning columns, the surface of the bottom plate around the positioning columns is respectively provided with a hinge pressing mechanism, a main pressing mechanism, an auxiliary pressing mechanism and a plurality of special-shaped positioning seats, and the hinge pressing mechanism, the main pressing mechanism, the auxiliary pressing mechanism and the plurality of special-shaped positioning seats are fixedly connected with the bottom plate through screws.

[0012] In the technical solution, the main pressing mechanism is composed of an oil cylinder, a clamping rod, a connecting rod and a clamping jaw, the oil cylinder is fixedly installed on the top surface of the bottom plate, the telescopic end of the oil cylinder is telescopically extended in the vertical direction and rotationally connected with one end of the clamping rod, the clamping rod is of L-shaped structure, the middle part of the clamping rod is rotationally connected with the connecting rod, the other end of the connecting rod is rotationally connected with the main cylinder body of the oil cylinder, and the other end of the clamping rod is fixedly connected with the clamping jaw.

[0013] In the technical solution, the auxiliary pressing mechanism has the same structure as the hinge pressing mechanism and the main pressing mechanism, the clamping jaw on the auxiliary pressing mechanism is of V-shaped structure, the clamping jaw on the main pressing mechanism is of bent structure, the telescopic ends of the oil cylinders of the main pressing mechanism and the auxiliary pressing mechanism are oriented in the same direction, and the oil cylinder of the hinge pressing mechanism is telescopically extended in the horizontal direction.

[0014] In the technical solution, the center positioning assembly is composed of a center positioning column of annular structure, the center positioning column is fixedly installed in the inside of the bottom plate through an inner hexagonal bolt, a hub workpiece is sleeved on the surface of the center positioning column, the hinge pressing mechanism, the main pressing mechanism, the auxiliary pressing mechanism and the plurality of special-shaped positioning seats are arranged around the center positioning column, and the special-shaped positioning seats are arranged alternately between the hinge pressing mechanism, the main pressing mechanism and the auxiliary pressing mechanism.

[0015] In the technical solution, a plurality of movable rods are inserted through the inside of the top end of the center positioning column, the plurality of movable rods are uniformly arranged at the edges of the center positioning column, both ends of each movable rod are fixedly connected with end heads of semicircular structure, one of the end heads is connected with 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 head extends into the inside of the center positioning column.

[0016] In the technical solution, the installation assembly comprises an installation plate and a shell, the installation plate is provided with a filter screen in the middle part, the installation plate is fixedly installed on the bottom surface of the bottom plate, the installation plate is correspondingly arranged below the center positioning column, the shell is fixedly installed on the bottom end of the installation plate, the bottom end of the shell is of an inner recess structure, the inner bottom surface of the shell is fixedly connected with a ring-shaped sealing ring, and the bottom part of the shell is connected with a flow guide pipe.

[0017] In the technical solution, the limiting assembly is composed of a fixed plate and a stepping motor, the fixed plate is fixedly installed on the bottom part of the shell, the stepping motor is fixedly connected with the bottom part of the fixed plate, the output end of the stepping motor is fixedly connected with a driving shaft, the driving shaft penetrates through the shell and the installation plate and extends into the center positioning column, the surface of the driving shaft is fixedly connected with a flow guide plate located in the shell, the flow guide plate is of a bowl-shaped structure and located on the bottom surface of the shell, the flow guide plate is in contact with the sealing ring, the top end of the driving shaft is fixedly connected with a rotating disc, the edge of the rotating disc is provided with a plurality of grooves which are the same in number as the movable rods, and the inner wall of the groove is in contact with the end head.

[0018] The application further provides a machining method of the hub positioning tool, and the machining method comprises the following steps:

[0019] (1) Hub pre-positioning, the hub workpiece is sleeved on the surface of the center positioning column, the special position of the hub workpiece is limited by the special-shaped positioning seat, the stepping motor is started to drive the driving shaft and the rotating disc to rotate synchronously, the grooves on the edge of the rotating disc extrude the end head and push the movable rods to move, the movable rods drive the end head to abut against the inner wall of the hub workpiece to realize pre-positioning, the spring is overcome.

[0020] (2) Hub outer contour positioning, first, the hinge pressing mechanism is started, the horizontal extension of the oil cylinder extension end drives the clamping rod to abut against the hub workpiece, so that the hub workpiece abuts against the special-shaped positioning seat to realize angular positioning, then, the main pressing mechanism is started, the clamping jaws of the oil cylinder extension end press the top surface of the hub workpiece, finally, the auxiliary pressing mechanism is started to further press and fix the hub workpiece by the clamping jaws.

[0021] (3) Machine tool machining, the machining tool on the side of the machine tool is used to machine the hub workpiece, the supporting plate can be installed and fixed on the bottom plate, so that the supporting plate and the bottom plate can rotate around the disc to realize multi-axis machining to machine the complex position of the hub workpiece.

[0022] (4) Cooling liquid flow guide, the hub workpiece machining position is sprayed with cooling liquid for cooling, the cooling liquid flows out of the installation plate in the center positioning column, the inner recess structure at the bottom of the shell is used to realize smooth flow of the cooling liquid, the fit of the flow guide plate and the sealing ring can avoid leakage of the cooling liquid, the effective fit of the flow guide plate and the sealing ring is always ensured when the flow guide plate on the driving shaft is rotated by the stepping motor, and the cooling liquid is completely discharged from the flow guide pipe to realize collection.

[0023] On the basis of common knowledge in the art, the above-mentioned preferred conditions can be combined arbitrarily, that is, to obtain each preferred example of the present application.

[0024] The positive progress effect of the present application is that:

[0025] The above-mentioned wheel hub positioning tool and processing method adopts a bottom plate to realize the installation and fixation of multiple clamping assemblies, adopts a center positioning to realize the preliminary fixation of the wheel hub, and realizes the further limiting of the wheel hub after installation through the cooperation of the installation assembly and the limiting assembly, ensures that the wheel hub is stably positioned through the clamping assembly, and can facilitate the convenient disassembly and assembly of the wheel hub, and can also facilitate the effective fixation of the wheel hub during installation and positioning, and the installation assembly can be used for subsequent cooling liquid flow guide, and will not cause the problem that the cooling liquid cannot be effectively discharged, and will not affect the driving of the limiting assembly, improves the processing convenience, and adopts multi-point control to realize the pre-assembly of the wheel hub, and then uses the clamping assembly to press and fix the angular and vertical positions, improves the stability of the wheel hub after positioning. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present application.

[0027] Figure 2 It is a schematic diagram of the overall three-dimensional structure of the present application. Figure 1

[0028] Figure 3 It is a schematic diagram of the overall three-dimensional structure of the present application.

[0029] Figure 4 It is a schematic diagram of the overall three-dimensional structure of the present application. Figure 3

[0030] Figure 5 It is a schematic diagram of the overall three-dimensional structure of the present application.

[0031] Figure 6 It is a schematic diagram of the overall three-dimensional structure of the present application. Figure 5

[0032] Figure 7 It is a schematic diagram of the overall three-dimensional structure of the present application.

[0033] Figure 8 It is a schematic diagram of the overall three-dimensional structure of the present application.

[0034] Figure 9 It is a schematic diagram of the overall three-dimensional structure of the present application.

[0035] Figure 10 It is a schematic diagram of the overall three-dimensional structure of the present application.

[0036] REFERENCE NUMERALS​​​

[0037] 10. Machine tool assembly; 11. Base; 12. Base; 13. Fixed seat; 14. Disc; 15. Pallet;

[0038] 20. Clamping assembly; 21. Base plate; 22. Irregularly shaped positioning seat; 23. Hinge clamping mechanism; 24. Main clamping mechanism; 25. Auxiliary clamping mechanism; 251. Hydraulic cylinder; 252. Clamping rod; 253. Connecting rod; 254. Gripper;

[0039] 30. Center positioning assembly; 31. Center positioning post; 32. Socket head bolt; 33. Wheel hub part; 34. Movable rod; 35. End; 36. Spring;

[0040] 40. Mounting components; 41. Mounting plate; 42. Housing; 43. Guide tube; 44. Sealing ring;

[0041] 50. Limiting component; 51. Fixing plate; 52. Stepper motor; 53. Drive shaft; 54. Guide plate; 55. Turntable; 56. Groove. Detailed Implementation

[0042] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0043] like Figures 1-10 As shown, a hub positioning fixture is applied to a machine tool assembly 10, which includes a base 11. The hub positioning fixture includes:

[0044] The base 12 is fixedly connected to the surface of the base 11. The base 12 is slidably installed in the groove on the surface of the base 11 through the slide at its bottom. After the base 12 and the base 11 are aligned, they are locked together with screws to form a whole. The base 12 is fixedly installed with a fixing seat 13 at both ends; the two fixing seats 13 are opposite to each other.

[0045] The clamping assembly 20 can be used for positioning the wheel hub workpiece 33 after installation. The clamping assembly 20 is equipped with multiple clamps for clamping and fixing the wheel hub workpiece 33 at various positions. The clamping assembly 20 includes a base plate 21, which is disposed between two fixed seats 13. A center positioning assembly 30 is fixedly installed on the surface of the base plate 21. The center positioning assembly 30 is used to initially position the center of the wheel hub workpiece 33 during initial installation, and then the clamping assembly 20 is used to press and limit its edges. It includes a non-standard positioning seat, a hinge pressing mechanism 23, a main pressing mechanism 24, and an auxiliary pressing mechanism 25.

[0046] The mounting assembly 40 is used for fixing the bottom of the bottom plate 21, and the limiting assembly 50 can be fixed on the bottom of the bottom plate 21 through the mounting assembly 40, and the mounting assembly 40 can be used for guiding the flow of cooling water to discharge excess cooling liquid, the limiting assembly 50 is fixed on the bottom of the mounting assembly 40 and can drive the rotating disc 55 to rotate, the rotating disc 55 is used for abutting against the movable rod 34 to realize the center positioning of the hub workpiece 33, the mounting assembly 40 is fixed on the bottom of the bottom plate 21, the mounting assembly 40 penetrates 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.

[0047] The fixed seat 13 is provided with a disc 14 facing the inner wall of the center positioning assembly 30, the disc 14 is rotationally connected with a bearing part in the inside of the fixed seat 13, and the fixed seat 13 is provided with a driving device connected with the disc 14 on the opposite outer wall in the inside, the disc 14 is fixedly installed with an L-shaped supporting plate 15 facing the side wall of the center positioning assembly 30, the number of the supporting plates 15 is two, and the two supporting plates 15 are fixedly connected with the two ends of the bottom plate 21 through screws respectively, and the two supporting plates 15 are symmetrical.

[0048] In the technical solution, the supporting plate 15 is used for the installation of the bottom plate 21, and the supporting plate 15 and the bottom plate 21 can be driven to rotate synchronously through the driving disc 14, so that the angle adjustment of the hub workpiece 33 after being fixed after rotation can be realized, so as to adapt to the processing of different arbitrary angles.

[0049] The surface of the bottom plate 21 is provided with two center positioning columns 31, the surface of the bottom plate 21 around the positioning columns is respectively provided with a hinge pressing mechanism 23, a main pressing mechanism 24, an auxiliary pressing mechanism 25 and a plurality of special-shaped positioning seats 22, 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 fixedly connected with the bottom plate 21 through screws; the main pressing mechanism 24 is composed of an oil cylinder 251, a clamping rod 252, a connecting rod 253 and a clamping jaw 254, the oil cylinder 251 is fixedly installed on the top surface of the bottom plate 21, the telescopic end of the oil cylinder 251 is telescopic in the vertical direction and is rotationally connected with one end of the clamping rod 252, the clamping rod 252 is of an L-shaped structure, the middle part of the clamping rod 252 is rotationally connected with the connecting rod 253, the other end of the connecting rod 253 is rotationally connected with the main cylinder body of the oil cylinder 251, and the other end of the clamping rod 252 is fixedly connected with the clamping jaw 254; the auxiliary pressing mechanism 25 is the same in structure as the hinge pressing mechanism 23 and the main pressing mechanism 24, the clamping jaw 254 on the auxiliary pressing mechanism 25 is of a V-shaped structure, the clamping jaw 254 on the main pressing mechanism 24 is of a bent structure, the telescopic ends of the oil cylinders 251 of the main pressing mechanism 24 and the auxiliary pressing mechanism 25 face the same direction, and the oil cylinder 251 of the hinge pressing mechanism 23 is telescopic in the horizontal direction.

[0050] In the technical solution, the center positioning column 31 is used for preliminary fixing of the hub workpiece 33. When the hub workpiece 33 is placed on the center positioning column 31, the movable rods 34 in the center positioning column 31 drive the end heads 35 to abut against the inner wall of the hub workpiece 33 to achieve preliminary fixing, and rely on the plurality of special-shaped positioning seats 22 to achieve primary limiting. When the hub workpiece 33 is placed on the center positioning column 31, the plurality of special-shaped positioning seats 22 abut against the corresponding positions of the hub workpiece 33, so that primary limiting can be achieved. After the pre-positioning of the mounting assembly 40 and the limiting assembly 50, the pre-positioning is in the state after the preliminary fixing by the center positioning column 31 and the primary limiting by the special-shaped positioning seat 22. The oil cylinder 251 of the hinge pressing mechanism 23 is horizontally extended and retracted, so as to drive the hub workpiece 33 to abut against the special-shaped positioning seat 22. After the hub workpiece 33 is pressed by the main pressing mechanism 24, the auxiliary pressing mechanism 25 is used for re-pressing and fixing, so that stable limiting of the hub workpiece 33 is achieved, and the positioning stability is ensured.

[0051] The center positioning assembly 30 is composed of the annular center positioning column 31. The center positioning column 31 is fixedly installed in the inner part of the bottom plate 21 through the inner hexagonal bolt 32. The hub workpiece 33 is sleeved on the surface of the center positioning column 31. The hinge pressing mechanism 23, the main pressing mechanism 24 and the auxiliary pressing mechanism 25 and the plurality of special-shaped positioning seats 22 are arranged around the center positioning column 31, and the special-shaped positioning seats 22 are staggered between the hinge pressing mechanism 23, the main pressing mechanism 24 and the auxiliary pressing mechanism. A plurality of movable rods 34 are inserted into the inner part of the top end of the center positioning column 31. The plurality of movable rods 34 are uniformly arranged at the edges of the center positioning column 31. Both ends of each movable rod 34 are fixedly connected with the semicircular end head 35. One end head 35 is connected with the inner part of the center positioning column 31 through the spring 36. The spring 36 is sleeved on the surface of the movable rod 34. The other end head 35 extends into the inner part of the center positioning column 31.

[0052] In the 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, so that the hub workpiece 33 can be smoothly sleeved on the center positioning column 31. Then the plurality of end heads 35 are used for multi-point fixing of the inner wall of the hub workpiece 33, so as to ensure stable limiting for subsequent processing.

[0053] The mounting assembly 40 comprises a mounting plate 41 and a shell 42, the mounting plate 41 is provided with a filter screen in the middle part, the mounting plate 41 is fixedly installed on the bottom surface of the bottom plate 21, the mounting plate 41 is correspondingly arranged below the center positioning column 31, the shell 42 is fixedly installed at the bottom end of the mounting plate 41, the bottom end of the shell 42 is of an inner recess structure, the inner bottom surface of the shell 42 is fixedly connected with a sealing ring 44 of an annular structure, and the shell 42 is connected with a flow guide pipe 43 at the bottom; the limiting assembly 50 is composed of a fixed plate 51 and a stepping motor 52, the fixed plate 51 is fixedly installed at the bottom of the shell 42, the stepping motor 52 is fixedly connected with the bottom of the fixed plate 51, the output end of the stepping motor 52 is fixedly connected with a driving shaft 53, the driving shaft 53 penetrates through the shell 42 and the mounting plate 41 and extends into the center positioning column 31, the driving shaft 53 is fixedly connected with a flow guide plate 54 located in the shell 42, the flow guide plate 54 is of a bowl structure and located on the bottom surface of the shell 42, and the flow guide plate 54 is in contact with the sealing ring 44, the top end of the driving shaft 53 is fixedly connected with a rotating disc 55, the rotating disc 55 is provided with a plurality of grooves 56 at the edge, and the number of the grooves 56 is same as that of the movable rods 34, and the inner wall of the groove 56 is in contact with the end 35.

[0054] In the technical solution, the shell 42 is fixed on the bottom of the bottom plate 21 through the mounting plate 41, the shell 42 can guide the flow of the cooling liquid, when part of the cooling liquid flows down at the center positioning assembly 30 during machining, the cooling liquid flows down through the filter screen in the middle part of the mounting plate 41 and enters the shell 42, the inner recess structure at the bottom of the shell 42 smoothly guides the flow of the cooling liquid and discharges the cooling liquid through the flow guide pipe 43, and the cooperation of the sealing ring 44 and the flow guide plate 54 realizes the sealing of the connection between the shell 42 and the driving shaft 53, without affecting the rotation of the driving shaft 53.

[0055] Further, when the stepping motor 52 drives the driving shaft 53 to rotate, the flow guide plate 54 rotates on the surface of the sealing ring 44, and the driving shaft 53 rotates in the mounting plate 41 and drives the disc 14 to rotate, when the end 35 moves out of the groove 56, the end 35 pushes the movable rod 34 to move outward, and then abuts against the inner wall of the wheel hub workpiece 33, when the stepping motor 52 reversely rotates, the end 35 reenters the groove 56, and the elasticity of the spring 36 drives the movable rod 34 to reset, at this time, the wheel hub workpiece 33 can be conveniently taken down, and the wheel hub workpiece 33 is conveniently disassembled and assembled.

[0056] A machining method of a wheel hub positioning tool, the machining method comprising the following steps:

[0057] (1) Hub pre-positioning, the hub workpiece 33 is sleeved on the surface of the center positioning column 31, the special position of the hub workpiece 33 is limited by the special-shaped positioning seat 22, the driving shaft 53 and the rotating disc 55 are synchronously rotated by starting the stepping motor 52, the recess 56 at the edge of the rotating disc 55 extrudes the end head 35 and drives the movable rod 34 to move, the end head 35 is driven by the movable rod 34 to resist the inner wall of the hub workpiece 33 to realize pre-positioning by overcoming the elasticity of the spring 36;

[0058] (2) Hub contour positioning, first, the hinge pressing mechanism 23 is started, the clamping rod 252 is driven to resist the hub workpiece 33 by the horizontal extension of the telescopic end of the oil cylinder 251, so that the hub workpiece 33 is positioned on the special-shaped positioning seat 22, then the main pressing mechanism 24 is started, the clamping jaw 254 of the telescopic end of the oil cylinder 251 is used to press the top surface of the hub workpiece 33, finally, the auxiliary pressing mechanism 25 is started to further press and fix the hub workpiece 33 by the clamping jaw 254;

[0059] (3) Machine tool machining, the machining tool on the side of the machine tool is used for machining the hub workpiece 33, the base plate 21 can be installed and fixed on the base plate 15, so that the base plate 15 and the base plate 21 can rotate around the disc 14 to realize multi-axis machining to process the complex position of the hub workpiece 33;

[0060] (4) Cooling liquid flow guide, the hub workpiece 33 is sprayed with cooling liquid for cooling, the cooling liquid flows out from the mounting plate 41 in the center positioning column 31, the inner recess structure at the bottom of the shell 42 is used to realize smooth flow of the cooling liquid, and the combination of the flow guide plate 54 and the sealing ring 44 can avoid leakage of the cooling liquid, the effective combination of the flow guide plate 54 and the sealing ring 44 is always ensured when the flow guide plate 54 on the driving shaft 53 is rotated by the stepping motor 52, and the cooling liquid is discharged from the flow guide pipe 43 to realize collection.

[0061] The application is not limited to the above-mentioned embodiments, and any changes in shape or structure fall within the protection scope of the application. The protection scope of the application is defined by the appended claims, and those skilled in the art can make various changes or modifications to the embodiments without departing from the principles and essence of the application, and these changes and modifications fall within the protection scope of the application.

Claims

1. A wheel hub positioning tool, characterized by, Be applied to machine tool assembly (10), the machine tool assembly (10) includes base (11), the wheel hub positioning tool includes: Base (12) is fixedly connected with the surface of the base (11), both ends of the base (12) are fixedly installed with fixed seat (13); Clamping assembly (20), the clamping assembly (20) includes bottom plate (21), the bottom plate (21) is arranged between two fixed seats (13), the surface of the bottom plate (21) is fixedly installed with center positioning assembly (30), special-shaped positioning seat, hinge compression mechanism (23), main compression mechanism (24) and auxiliary compression mechanism (25) respectively; Mounting assembly (40) and limiting assembly (50), the mounting assembly (40) is fixedly installed to the bottom of bottom plate (21), the mounting assembly (40) penetrates center positioning assembly (30), the limiting assembly (50) is fixedly connected to the bottom end of mounting assembly (40), the limiting assembly (50) is inserted through the inside of mounting assembly (40), and the limiting assembly (50) extends to the inside of center positioning assembly (30); The mounting assembly (40) includes mounting plate (41) and shell (42), the mounting plate (41) is provided with a filter screen in the middle, the mounting plate (41) is fixedly installed to the bottom surface of the bottom plate (21), the mounting plate (41) is correspondingly arranged below the center positioning column (31), the shell (42) is fixedly installed to the bottom end of the mounting plate (41), the bottom end of the shell (42) is of a concave structure, the inside bottom surface of the shell (42) is fixedly connected with a sealing ring (44) of annular structure, and the bottom of the shell (42) is connected with a flow guide pipe (43) penetratingly; The limiting assembly (50) is composed of fixed plate (51) and stepping motor (52), the fixed plate (51) is fixedly installed to the bottom of the shell (42), the stepping motor (52) is fixedly connected with the bottom of the fixed plate (51), the output end of the stepping motor (52) is fixedly connected with a driving shaft (53), the driving shaft (53) penetrates the shell (42) and the mounting plate (41) and extends to the inside of the center positioning column (31) respectively, the surface of the driving shaft (53) is fixedly connected with a flow guide plate (54) located in the inside of the shell (42), the flow guide plate (54) is of a bowl-shaped structure and is located on the bottom surface of the shell (42), and the flow guide plate (54) is in contact with the sealing ring (44), the top end of the driving shaft (53) is fixedly connected with a rotating disc (55), the edge of the rotating disc (55) is provided with a plurality of grooves (56) which are the same in number as the movable rods (34), and the inner wall of the groove (56) is in contact with the end (35).

2. The wheel hub positioning fixture of claim 1, wherein: The inner wall of the fixed seat (13) is provided with a disc (14), the disc (14) is rotatably connected with the bearing part in the inside of the fixed seat (13), and the outer wall of the fixed seat (13) is provided with a driving device connected with the disc (14), the side wall of the disc (14) is fixedly installed with an L-shaped structure of the supporting plate (15), the number of the supporting plate (15) is two, and both the supporting plates (15) are fixedly connected with both ends of the bottom plate (21) through the screw rod respectively.

3. The wheel hub positioning fixture of claim 1 wherein: The bottom plate (21) is provided with two center positioning columns (31) on the surface, and the surface of the bottom plate (21) around the positioning columns is respectively provided with a hinge pressing mechanism (23), a main pressing mechanism (24), an auxiliary pressing mechanism (25) and a plurality of special-shaped positioning seats (22), and 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 fixedly connected with the bottom plate (21) through screws.

4. The wheel hub positioning fixture of claim 3, wherein: The main pressing mechanism (24) is composed of an oil cylinder (251), a clamping rod (252), a connecting rod (253) and a clamping jaw (254), the oil cylinder (251) is fixedly installed on the top surface of the bottom plate (21), the telescopic end of the oil cylinder (251) is telescopic in the vertical direction and is rotationally connected with one end of the clamping rod (252), the clamping rod (252) is in L-shaped structure, the middle part of the clamping rod (252) is rotationally connected with the connecting rod (253), and the other end of the connecting rod (253) is rotationally connected with the main cylinder body of the oil cylinder (251), and the other end of the clamping rod (252) is fixedly connected with the clamping jaw (254).

5. The wheel hub positioning fixture of claim 3, wherein: The auxiliary pressing mechanism (25) is the same in structure as the hinge pressing mechanism (23) and the main pressing mechanism (24), the clamping jaw (254) on the auxiliary pressing mechanism (25) is in V-shaped structure, the clamping jaw (254) on the main pressing mechanism (24) is in bent structure, the telescopic ends of the oil cylinders (251) of the main pressing mechanism (24) and the auxiliary pressing mechanism (25) are in the same direction, and the telescopic end of the oil cylinder (251) of the hinge pressing mechanism (23) is telescopic in the horizontal direction.

6. The wheel hub positioning fixture of claim 1 wherein: The center positioning assembly (30) is composed of a center positioning column (31) in annular structure, the center positioning column (31) is fixedly installed in the inside of the bottom plate (21) through an inner hexagonal bolt (32), a hub workpiece (33) is sleeved on the surface of the center positioning column (31), the hinge pressing mechanism (23), the main pressing mechanism (24) and the auxiliary pressing mechanism (25) and the plurality of special-shaped positioning seats (22) are arranged around the center positioning column (31), and the special-shaped positioning seats (22) are arranged alternately between the hinge pressing mechanism (23), the main pressing mechanism (24) and the auxiliary pressing mechanism (25).

7. The wheel hub positioning fixture of claim 6, wherein: A plurality of movable rods (34) are inserted through the inside of the top end of the center positioning column (31), the plurality of movable rods (34) are uniformly arranged at the edges of the center positioning column (31), both ends of each movable rod (34) are fixedly connected with end heads (35) in semicircular structure, one of the end heads (35) is connected with 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 head (35) extends into the inside of the center positioning column (31).

8. A method of machining a wheel hub using a wheel hub positioning tool according to any one of claims 1 to 7, characterised in that: The processing method comprises the following steps: (1) Hub pre-positioning, the hub workpiece (33) is sleeved on the surface of the center positioning column (31), the special position of the hub workpiece (33) is limited by the special-shaped positioning seat (22), the step motor (52) is started to drive the driving shaft (53) and the rotating disc (55) to rotate synchronously, the recess (56) at the edge of the rotating disc (55) extrudes the end head (35) and drives the movable rod (34) to move, the movable rod (34) drives the end head (35) to abut against the inner wall of the hub workpiece (33) to realize pre-positioning against the elasticity of the spring (36); (2) Hub contour positioning, first start the hinge pressing mechanism (23), use the horizontal extension of the oil cylinder (251) to drive the clamping rod (252) to abut against the hub workpiece (33), so that it abuts against the special-shaped positioning seat (22), realize angular positioning, then start the main pressing mechanism (24), use the clamping jaw (254) of the oil cylinder (251) to press the top surface of the hub workpiece (33), finally start the auxiliary pressing mechanism (25) to further press and fix the hub workpiece (33) by the clamping jaw (254); (3) Machine tool machining, use the machining tool on the side of the machine tool to machine the hub workpiece (33), the supporting plate (15) can be installed and fixed on the bottom plate (21), so that the supporting plate (15) and the bottom plate (21) can rotate around the disc (14), realize multi-axis machining to process the complex position of the hub workpiece (33); (4) Cooling liquid flow guide, the hub workpiece (33) is processed in the position of spraying cooling liquid, the cooling liquid flows out from the mounting plate (41) when flowing in the center positioning column (31), the inner recess structure at the bottom of the shell (42) is used to realize smooth flow of the cooling liquid, and the combination of the flow guide plate (54) and the sealing ring (44) can avoid leakage of the cooling liquid, the step motor (52) mobilizes the flow guide plate (54) on the driving shaft (53) to rotate, and always ensures the effective combination of the flow guide plate (54) and the sealing ring (44), the cooling liquid is discharged from the flow guide pipe (43) to realize collection.

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