A double cutter milling equipment for the outer ring surface of an automobile wheel hub

Abstract

The present application relates to the technical field of automobile hub milling, in particular to a double-tool milling equipment for the outer ring surface of an automobile hub. The equipment comprises a machining seat, a rotating centering assembly is arranged on the top of the machining seat, and double-tool milling assemblies for the outer ring surface are arranged on both sides of the rotating centering assembly on the top of the machining seat. In the present application, the outer support centering structure, the clutch and the end fixing structure are integrally arranged, the outer support device automatically slides outward to contact the inner wall of the hub to realize automatic centering when the main shaft rotates, the clutch is driven to move upward to engage with the lower disc body, the torque of the main shaft is transmitted to the hub through the clutch, the lower disc body and the screw rod, the automatic centering and the rotary driving of the hub are integrated, no additional centering device or independent rotary driving clamp is needed, the structure is compact and the operation is simple, and the problem that the existing milling equipment cannot rotate and drive and cannot automatically center and clamp when machining the rim is effectively solved.

Description

Technical Field

[0001] This invention relates to the field of automobile wheel hub milling technology, and more specifically, to a double-blade milling machine for the outer rim of an automobile wheel hub. Background Technology

[0002] The outer rim of a car wheel hub is the outermost ring of the wheel that directly contacts the tire bead and supports the tire. Its contour accuracy and surface quality directly affect the tire's air tightness and the wheel's dynamic balance, and it is usually machined by rotary milling.

[0003] In the prior art, patent CN213672799U discloses a milling device for intermediate supports. This device uses a clamping seat to fix the workpiece and a linear guide to drive the milling cutter head to move along the Y and X axes, achieving double-sided milling of the intermediate support blank. However, this device has the following direct drawbacks when applied to automobile wheel rim machining: First, it lacks the ability to rotate the hub. This equipment relies on a clamping seat to hold the workpiece stationary, but the wheel rim is a continuous annular surface, requiring the hub to rotate uniformly around its own axis to complete circumferential milling. Without a rotating spindle, continuous tool feed is impossible, segmented machining easily produces tool marks, and it's difficult to meet the requirements for airtightness and dynamic balance.

[0004] Secondly, it is impossible to automatically center and stably clamp thin-walled annular parts. The hub has low radial stiffness, and the mounting groove of the clamping seat cannot provide uniform centripetal support. When there are casting deviations in the inner hole of the blank, it is difficult to make the workpiece axis automatically coincide with the center of rotation. Centering deviation will directly lead to uneven rim wall thickness, affecting the strength and dynamic balance of the wheel.

[0005] Third, the single-sided milling layout cannot simultaneously machine the upper and lower areas of the rim. The milling cutter head of this equipment is located above the workpiece, allowing only single-sided machining. Since the rim needs to be milled to different heights, such as the upper and lower flanges, multiple tool shifts and reclampings are not only inefficient but also make it difficult to guarantee the relative dimensional accuracy and symmetry of the upper and lower machined surfaces, easily leading to contour misalignment.

[0006] In summary, existing milling equipment has several drawbacks when machining automobile wheel rims, including lack of rotary drive, difficulty in centering and clamping, and inability to perform simultaneous dual-blade machining. Summary of the Invention

[0007] The purpose of this invention is to solve the problems of existing milling equipment in machining wheel rims, such as lack of rotary drive, inability to automatically center and clamp, and inability to perform simultaneous machining with two blades.

[0008] To achieve the above objectives, the present invention aims to provide a double-blade milling machine for the outer surface of an automobile wheel hub, comprising a machining base, a rotary centering assembly on the top of the machining base, and outer surface double-blade milling assemblies on both sides of the rotary centering assembly on the top of the machining base. The outer surface double-blade milling assemblies are used to mill the wheel hub. A machining groove is formed on the upper surface of the middle part of the machining base, and a receiving ring disc for supporting the wheel hub is provided in the machining groove. The rotary centering assembly includes a main motor fixed inside the machining base, an end fixing structure and an external support centering structure located above the receiving ring. The end fixing structure includes a lower plate and an upper plate that clamp and fix the mounting surface of the wheel hub. The central axis of the lower plate and the upper plate coincides with the central axis of the wheel hub. A chuck cover is also attached to the outer edge of the lower plate. The external support centering structure includes a main shaft whose bottom end is connected to the main motor drive and multiple external supports that are horizontally slidably engaged with the outer periphery of the main shaft. The top of the main shaft is also provided with a clutch that can move up and down, and the outer periphery of the clutch is slidably engaged with the external supports. The clutch is configured to be driven upward when the outer support slides outward and engage with the bottom surface of the lower plate, so that the torque of the main shaft is transmitted to the lower plate through the clutch; The end of the external support is provided with a smooth inclined surface, and the inner wall of the chuck cover is provided with an inclined surface that cooperates with the smooth inclined surface. When the external support slides outward, its smooth inclined surface contacts the inclined surface of the inner wall of the chuck cover, generating a component force that presses the lower plate down.

[0009] As a further improvement to this technical solution, the lower plate includes a meshing plate, one side of which is used to contact the wheel hub wall, and the other side is provided with a meshing tooth groove. The meshing plate has two first sliding grooves symmetrically provided, and a screw is slidably connected in the first sliding groove. The upper plate includes a contact plate, and the upper plate has two corresponding second sliding grooves. A locking block is slidably connected in the second sliding groove. The top end of the screw passes through the screw fixing hole of the wheel hub to be processed, the locking block and is connected to the nut in sequence.

[0010] As a further improvement to this technical solution, a screw shaft is rotatably connected to the center of the contact disc. The two ends of the screw shaft are threadedly connected to the locking block, and the two screws move closer or further apart synchronously when the screw shaft is rotated.

[0011] As a further improvement to this technical solution, a sliding rod is connected to the outer wall of the portion of the top of the spindle located above the receiving ring. The outer support includes a slider that slides horizontally with the sliding rod. A spring is connected to one side of the slider, and the slider is elastically connected to the outer wall of the spindle through the spring.

[0012] As a further improvement to this technical solution, an outer support arm is rotatably connected to the other side of the slider, and an outer support wheel for contacting the inner wall of the hub is provided at the end of the outer support arm.

[0013] As a further improvement to this technical solution, the top end of the slider is slidably engaged with the clutch, and the smooth inclined surface is provided at the end of the slider.

[0014] As a further improvement to this technical solution, a shaft groove is provided at the top center of the main shaft. The clutch includes a ratchet sub-shaft with its bottom end located in the shaft groove and slidingly engaged with the inner wall of the shaft groove. The upper surface of the ratchet sub-shaft is provided with ratchet teeth for meshing with the bottom surface of the lower disc. A lower ring is sleeved around the ratchet sub-shaft. An upper ring is inserted into the top of the lower ring, and the lower ring and the upper ring are elastically connected. The outer periphery of the upper ring is slidably engaged with the top of the slider.

[0015] As a further improvement to this technical solution, the meshing disc of the lower disc body is provided with a disc edge, the chuck cover is an annular shell that is clamped on the disc edge, and an inner folded edge is connected to the bottom edge of the chuck cover. The inner wall of the inner folded edge forms the inclined surface that cooperates with the smooth inclined surface.

[0016] As a further improvement to this technical solution, the bottom surface of the receiving ring is provided with multiple balls, and the bottom surface of the receiving ring makes rolling contact with the inner surface of the processing groove through the balls.

[0017] As a further improvement to this technical solution, the top two ends of the machining base are connected to horizontal rods, and the outer ring double-blade milling assembly includes a displacement frame that slides horizontally with the horizontal rods and a first motor that controls the movement of the displacement frame. The displacement frame is vertically equipped with two milling cutters for milling the wheel hub, and the surface of the displacement frame is also equipped with a second motor for adjusting the height of the milling cutters.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In this double-blade milling machine for the outer rim of an automobile wheel hub, the outer support centering structure, clutch, and end fixing structure are integrated. When the spindle rotates, the outer support automatically slides outward to contact the inner wall of the wheel hub to achieve automatic centering. At the same time, the drive clutch moves upward to engage with the lower plate, so that the torque of the spindle is transmitted to the wheel hub through the clutch, the lower plate, and the screw. This achieves the integration of automatic centering and rotary drive of the wheel hub, eliminating the need for additional centering devices or independent rotary drive fixtures. The structure is compact and easy to operate, effectively solving the problem that existing milling equipment lacks rotary drive and cannot automatically center and clamp when processing wheel rims.

[0019] 2. In this double-blade milling machine for the outer rim of an automobile wheel hub, the end of the outer support is provided with a smooth inclined surface, and the inner wall of the chuck cover is provided with an inclined surface that mates with this smooth inclined surface. When the outer support slides outward, the two work together to generate a component force that presses down on the lower plate, pressing the wheel hub tightly onto the receiving ring plate. This downward force is converted from centrifugal force and automatically increases with the rotational speed, achieving dynamic matching between the clamping force and the milling conditions. This avoids deformation of the thin-walled wheel hub caused by rigid clamping and ensures the stability of the workpiece clamping during rotary milling. Combined with the double-blade milling components on both sides, it can simultaneously mill the upper and lower areas of the wheel rim in one clamping operation, improving machining accuracy and efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional schematic diagram of the structural mating parts of the machining base, the rotary centering assembly, and the wheel hub of the present invention. Figure 3 This is a schematic diagram showing the assembly of the end fixing structure and the external support centering structure of the present invention. Figure 4 This is a schematic diagram showing the disassembled end fixing structure of the present invention; Figure 5 This is a cross-sectional schematic diagram of the mating part of the lower and upper disc bodies of the present invention; Figure 6 This is a schematic cross-sectional view of the lower plate body and the chuck cover structure of the present invention. Figure 7 This is a schematic diagram of the cooperation between the main shaft and the external support structure of the present invention; Figure 8 This is a cross-sectional schematic diagram of the mating parts of the main shaft, external support, and clutch of the present invention. Figure 9 This is a cross-sectional schematic diagram of the mating part of the machining seat and the outer ring surface double-blade milling assembly structure of the present invention.

[0021] The meanings of the labels in the diagram are as follows: 1. Machining base; 11. Machining groove; 12. Receiving ring plate; 13. Horizontal bar; 2. Rotary centering assembly; 21. Main motor; 22. End fixing structure; 221. Lower plate body; 2211. Engaging plate; 2212. First slide groove; 2213. Screw; 2214. Plate edge; 222. Upper plate body; 2221. Contact plate; 2222. Second slide groove; 2223. Locking block; 2224. Screw shaft; 223. Chuck cover; 2231. Inner folded edge; 23. Outer support centering structure; 231. Main shaft; 2311. Slide rod; 2312. Shaft groove; 232. Outer support; 2321. Slider; 2322. Spring; 2323. Outer support arm; 2324. Outer support wheel; 233. Clutch; 2331. Ratchet sub-shaft; 2332. Lower ring; 2333. Upper ring; 3. Outer ring double-blade milling assembly; 31. Displacement frame; 32. First motor; 33. Milling cutter; 34. Second motor; 4. Wheel hub. Detailed Implementation

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] Please see Figure 1 , Figure 2 , Figure 3As shown, this embodiment of the invention provides a double-blade milling machine for the outer surface of an automobile wheel hub, including a machining base 1, a rotation centering component 2 on the top of the machining base 1, and outer surface double-blade milling components 3 on both sides of the rotation centering component 2 on the top of the machining base 1. The outer surface double-blade milling components 3 are used to mill the wheel hub 4. A machining groove 11 is provided on the upper surface of the middle part of the machining base 1. A receiving ring 12 for supporting the hub 4 is provided in the machining groove 11. The rotation centering assembly 2 includes a main motor 21 fixed in the machining base 1 and an end fixing structure 22 and an outer support centering structure 23 located above the receiving ring 12. The end fixing structure 22 includes a lower plate 221 and an upper plate 222 for clamping and fixing the mounting surface of the hub 4. The central axis of the lower plate 221 and the upper plate 222 coincides with the central axis of the hub 4. A chuck cover 223 is also attached to the outer edge of the lower plate 221. The outer support centering structure 23 includes a main shaft 231 whose bottom end is connected to the main motor 21 for transmission and a plurality of outer supports 232 that are horizontally slidably engaged with the outer periphery of the main shaft 231. A clutch 233 that can move up and down is also provided on the top of the main shaft 231. The outer periphery of the clutch 233 is slidably engaged with the outer supports 232.

[0026] The following describes the working process of this equipment in conjunction with its specific structure: After the chuck cover 223 is fastened onto the lower plate 221, the lower plate 221 and the upper plate 222 are placed on both sides of the mounting surface of the hub 4, respectively. The screw 2213 passes through the screw fixing hole of the hub 4 and is locked with the nut, thus achieving pre-clamping and fixing of the lower plate 221, the upper plate 222 and the hub 4; at this time, the torque of the main shaft 231 has not yet been transmitted to the lower plate 221. The pre-clamped hub 4 assembly is then placed on the receiving ring plate 12. When the main motor 21 is started, the main shaft 231 rotates and generates centrifugal force. The outer support 232 slides outward to contact the inner wall of the hub 4 to achieve automatic centering. When the outer support 232 slides outward, it drives the clutch 233 to move upward and engage with the bottom surface of the lower plate 221. At this time, the torque of the main shaft 231 is transmitted to the lower plate 221 through the clutch 233, and then to the hub 4 through the screw 2213, which drives the hub 4 to rotate. At the same time, the smooth inclined surface at the end of the outer support 232 contacts the inclined surface of the inner wall of the chuck cover 223, generating a component force that presses the lower plate 221 down, pressing the hub 4 tightly onto the receiving ring 12, thus achieving stable processing in the rotating state.

[0027] The specific structure and clamping method of the lower plate 221 and the upper plate 222 are as follows: Figure 2 , Figure 4 , Figure 5As shown, to facilitate clamping and fixing of hubs 4 with different diameters, the lower plate 221 includes a meshing plate 2211. One side of the meshing plate 2211 contacts the wall of the hub 4, and the other side has a meshing tooth groove. The meshing plate 2211 has two symmetrically arranged first sliding grooves 2212, and a screw 2213 is slidably connected in the first sliding groove 2212. The upper plate 222 includes a contact plate 2221, and the upper plate 222 has two corresponding second sliding grooves 2222. A locking block 2223 is slidably connected in the second sliding groove 2222. The top end of the screw 2213 is adapted to pass through the screw fixing hole of the hub to be processed, the locking block 2223, and connect with the nut in sequence. By tightening the nut, the lower plate 221, the upper plate 222, and the hub 4 are pre-clamped and fixed. By setting a sliding fit, the distance between the two screws 2213 can be adjusted so that they pass through the screw fixing hole in the diameter direction of the hub 4, thereby matching hubs 4 with different diameters. Furthermore, to ensure that the central axis of the lower disc 221 coincides with the central axis of the hub 4, a screw shaft 2224 is rotatably connected to the middle of the contact disc 2221. The two ends of the screw shaft 2224 are threadedly connected to the locking block 2223 respectively. Rotating the screw shaft 2224 can make the two screws 2213 move closer or further away synchronously, thereby ensuring that the midpoint of the two screws 2213 is always located on the central axis of the meshing disc 2211, which facilitates the subsequent stable rotation of the hub 4.

[0028] After clamping and fixing the wheel hub 4, place the wheel hub 4 on the receiving ring plate 12. Centering of the wheel hub 4 is then required. The specific composition and centering process of the outer support centering structure 23 are as follows: Figure 2 , Figure 7 As shown, a slide rod 2311 is connected to the outer wall of the portion of the top of the main shaft 231 located above the receiving ring 12. The outer support 232 includes a slider 2321 that slides horizontally with the slide rod 2311. A spring 2322 is connected to one side of the slider 2321, and the slider 2321 is elastically connected to the outer wall of the main shaft 231 through the spring 2322. The main motor 21 drives the main shaft 231 to rotate. Under centrifugal force, the slider 2321 slides outward along the slide rod 2311 until it contacts the inner wall of the hub 4. To prevent damage to the inner wall of the hub 4 due to hard contact, an outer support arm 2323 is rotatably connected to the other side of the slider 2321. The end of the outer support arm 2323 is provided with an outer support wheel 2324 for contacting the inner wall of the hub 4. The rotatable connection between the outer support arm 2323 and the slider 2321 allows the outer support wheel 2324 to adaptively adjust its angle when contacting the inner wall of the hub 4, which can both protect the surface of the workpiece and ensure reliable external support and centering of the hub 4.

[0029] To achieve torque transmission and workpiece clamping while simultaneously centering, the following linkage structure is adopted: the top end of the slider 2321 slides in engagement with the clutch 233, and the end of the slider 2321 is provided with a smooth inclined surface that matches the inclined surface of the inner wall of the chuck cover 223. For example... Figure 8As shown, the main shaft 231 has a shaft groove 2312 in the middle of the top. The clutch 233 includes a ratchet sub-shaft 2331 whose bottom end is located in the shaft groove 2312 and slides up and down with the shaft groove 2312. The upper surface of the ratchet sub-shaft 2331 is provided with ratchet teeth. A lower ring 2332 is sleeved around the ratchet sub-shaft 2331. An upper ring 2333 is inserted and fitted at the top of the lower ring 2332, and the lower ring 2332 and the upper ring 2333 are elastically connected. The outer periphery of the upper ring 2333 slides with the top of the slider 2321. When the slider 2321 slides outward, it drives the upper ring 2333 to slide upward, which in turn drives the ratchet countershaft 2331 to move upward through the lower ring 2332 until the ratchet teeth of the ratchet countershaft 2331 engage in the meshing groove on the bottom surface of the meshing disc 2211, thereby achieving synchronous rotation of the main shaft 231 and the meshing disc 2211. At this time, the torque of the main shaft 231 is transmitted sequentially through the ratchet countershaft 2331, the meshing disc 2211, and the screw 2213 to the hub 4, driving the hub 4 to rotate. It should be noted that when the main shaft 231 is not rotating, the clutch 233 is in a disengaged state from the lower disc 221, and the screw 2213 and nut only perform a pre-clamping function; after the main shaft 231 rotates, the clutch 233 moves upward and engages, and the torque transmission path is then connected. At the same time, as Figure 2 , Figure 5 , Figure 6 As shown, the engagement disc 2211 has a disc edge 2214 around its periphery, and the chuck cover 223 is an annular shell that is clamped onto the disc edge 2214, with an inner folded edge 2231 connected to its bottom edge. When the slider 2321 slides outward, its smooth inclined surface at the end contacts the inclined surface of the inner wall of the inner folded edge 2231. The radial displacement of the slider 2321 applies a downward component force to the chuck cover 223, which in turn applies downward pressure to the hub 4 through the engagement disc 2211, stabilizing the hub 4 on the receiving ring disc 12. To reduce the rotational resistance of the hub 4, multiple balls are provided on the bottom surface of the receiving ring disc 12, and the receiving ring disc 12 forms rolling friction with the inner surface of the machining groove 11 through the balls.

[0030] The structure and machining operation of the outer ring double-blade milling assembly 3 are as follows: Figure 9 As shown, the machining base 1 has horizontal rods 13 connected to both ends of its top. The outer rim double-blade milling assembly 3 includes a displacement frame 31 that slides horizontally with the horizontal rods 13, and a first motor 32 that controls the movement of the displacement frame 31 via a threaded feed. Two milling cutters 33 for milling the hub 4 are vertically mounted on the displacement frame 31, and a second motor 34 for adjusting the height of the milling cutters 33 is also mounted on the displacement frame 31. When the hub 4 is centered and rotating stably, the first motor 32 controls the horizontal feed of the displacement frame 31, and the second motor 34 adjusts the vertical position of the milling cutters 33, so that the upper and lower double-layer milling cutters 33 simultaneously mill the outer rim surface of the hub 4. The forming of the upper and lower areas of the rim can be completed in one clamping.

[0031] The basic operating principle of this device is as follows: In use, first fasten the chuck cover 223 onto the rim 2214 of the lower chuck body 221. Then, place the lower chuck body 221 and the upper chuck body 222 on both sides of the mounting surface of the hub 4. Adjust the screw shaft 2224 so that the two screws 2213 are aligned with the screw fixing holes of the hub 4, and tighten the nut to complete the pre-clamping. At this time, the clutch 233 has not yet engaged with the lower chuck body 221, and the torque of the main shaft 231 will not be transmitted to the hub 4. Subsequently, place the clamped hub 4 on the receiving ring 12 so that the main shaft 231 and the external support 232 are located in the inner cavity of the hub 4. When the main motor 21 is started, the main shaft 231 rotates and generates centrifugal force. The slider 2321 overcomes the tension of the spring 2322 and moves outward along the slide rod 2311. The outer support wheel 2324 contacts the inner wall of the hub 4 to complete automatic centering. At the same time, the slider 2321 pushes the upper ring 2333 to move upward, and through the lower ring 2332, the ratchet sub-shaft 2331 rises and engages the meshing disc 2211. The torque of the main shaft 231 is transmitted to the hub 4 through the clutch 233, the lower disc body 221 and the screw 2213, driving the hub 4 to rotate. When the slider 2321 moves outward, its smooth inclined surface at the end interacts with the inclined surface of the inner folded edge 2231 of the chuck cover 223, converting the centrifugal force into a continuous downward pressure on the lower disc body 221, so that the hub 4 is tightly attached to the receiving ring disc 12 and rotates stably. Finally, the first motor 32 and the second motor 34 control the feed of the upper and lower milling cutters 33 to simultaneously mill the outer surface of the hub 4, completing the precise machining of the rim in one go.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-blade milling machine for the outer surface of an automobile wheel hub, comprising a machining base (1), wherein a rotation centering assembly (2) is provided on the top of the machining base (1), and double-blade milling assemblies (3) for the outer surface are provided on both sides of the rotation centering assembly (2) on the top of the machining base (1), wherein the double-blade milling assemblies (3) are used to mill the wheel hub (4), characterized in that: The upper surface of the middle part of the processing base (1) is provided with a processing groove (11), and a receiving ring (12) for supporting the hub (4) is provided in the processing groove (11). The rotation centering assembly (2) includes a main motor (21) fixed in the processing base (1) and an end fixing structure (22) and an outer support centering structure (23) located above the receiving ring (12). The end fixing structure (22) includes a lower plate (221) and an upper plate (222) for clamping and fixing the mounting surface of the hub (4). The central axis of the lower plate (221) and the upper plate (222) coincides with the central axis of the hub (4). A chuck cover (223) is also attached to the outer edge of the lower plate (221). The external support centering structure (23) includes a main shaft (231) whose bottom end is connected to the main motor (21) for transmission, and a plurality of external supports (232) that are horizontally slidably engaged with the outer periphery of the main shaft (231). The top of the main shaft (231) is also provided with a clutch (233) that can move up and down. The outer periphery of the clutch (233) is slidably engaged with the external supports (232). The clutch (233) is configured to be driven upward when the outer support (232) slides outward and engage with the bottom surface of the lower plate (221), so that the torque of the main shaft (231) is transmitted to the lower plate (221) through the clutch (233). The end of the external support (232) is provided with a smooth inclined surface, and the inner wall of the chuck cover (223) is provided with an inclined surface that cooperates with the smooth inclined surface. When the external support (232) slides outward, its smooth inclined surface contacts the inclined surface of the inner wall of the chuck cover (223), generating a component force that presses down the lower plate (221).

2. The double-blade milling machine for the outer surface of an automobile wheel hub according to claim 1, characterized in that: The lower plate (221) includes a meshing plate (2211), one side of which is used to contact the wall of the hub (4), and the other side is provided with a meshing tooth groove. The meshing plate (2211) is symmetrically provided with two first sliding grooves (2212), and a screw (2213) is slidably connected in the first sliding groove (2212). The upper plate (222) includes a contact plate (2221), and the upper plate (222) is provided with two corresponding second sliding grooves (2222). A locking block (2223) is slidably connected in the second sliding groove (2222). The top end of the screw (2213) passes through the screw fixing hole of the hub to be processed, the locking block (2223) in sequence, and is connected to the nut.

3. The double-blade milling machine for the outer surface of an automobile wheel hub according to claim 2, characterized in that: The contact plate (2221) is also rotatably connected to a screw shaft (2224). The two ends of the screw shaft (2224) are threadedly connected to the locking block (2223). When the screw shaft (2224) is rotated, the two screws (2213) move closer or further away synchronously.

4. The double-blade milling machine for the outer surface of an automobile wheel hub according to claim 1, characterized in that: The top of the main shaft (231) is connected to the outer wall of the portion above the receiving ring (12) by a slide rod (2311). The outer support (232) includes a slider (2321) that slides horizontally with the slide rod (2311). A spring (2322) is connected to one side of the slider (2321). The slider (2321) is elastically connected to the outer wall of the main shaft (231) through the spring (2322).

5. The double-blade milling machine for the outer surface of an automobile wheel hub according to claim 4, characterized in that: The slider (2321) is rotatably connected to an outer support arm (2323) on the other side, and the end of the outer support arm (2323) is provided with an outer support wheel (2324) for contacting the inner wall of the hub (4).

6. The double-blade milling machine for the outer surface of an automobile wheel hub according to claim 4, characterized in that: The top end of the slider (2321) is slidably engaged with the clutch (233), and the smooth inclined surface is provided at the end of the slider (2321).

7. The double-blade milling machine for the outer surface of an automobile wheel hub according to claim 4, characterized in that: The main shaft (231) has a shaft groove (2312) at the top center. The clutch (233) includes a ratchet sub-shaft (2331) with its bottom end located in the shaft groove (2312) and slidingly engaged with the inner wall of the shaft groove (2312). The upper surface of the ratchet sub-shaft (2331) is provided with ratchet teeth for meshing with the bottom surface of the lower plate (221). A lower ring (2332) is sleeved around the ratchet sub-shaft (2331). An upper ring (2333) is inserted into the top of the lower ring (2332) and the lower ring (2332) is elastically connected to the upper ring (2333). The outer periphery of the upper ring (2333) is slidably engaged with the top of the slider (2321).

8. The double-blade milling machine for the outer surface of an automobile wheel hub according to claim 1, characterized in that: The lower disc body (221) has a disc edge (2214) around the meshing disc (2211). The chuck cover (223) is an annular shell that is clamped on the disc edge (2214). An inner folded edge (2231) is connected to the bottom edge of the chuck cover (223). The inner wall of the inner folded edge (2231) forms the inclined surface that cooperates with the smooth inclined surface.

9. The double-blade milling machine for the outer surface of an automobile wheel hub according to claim 1, characterized in that: The bottom surface of the receiving ring (12) is provided with a plurality of balls, and the bottom surface of the receiving ring (12) makes rolling contact with the inner surface of the processing groove (11) through the balls.

10. The double-blade milling machine for the outer surface of an automobile wheel hub according to claim 1, characterized in that: The machining base (1) has horizontal rods (13) connected to both ends of the top. The outer ring double-blade milling assembly (3) includes a displacement frame (31) that slides horizontally with the horizontal rod (13) and a first motor (32) that controls the movement of the displacement frame (31). The displacement frame (31) is vertically provided with two milling cutters (33) for milling the hub (4). The surface of the displacement frame (31) is also provided with a second motor (34) for adjusting the height of the milling cutters (33).

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