A polishing device for manufacturing automobile wheel hubs

Abstract

The application provides a polishing device for manufacturing automobile wheel hub, and relates to the field of wheel hub manufacturing wire drawing lathe. The polishing device for manufacturing automobile wheel hub comprises a lathe body, further comprises a wheel hub clamping assembly installed on the lathe body, the wheel hub clamping assembly can be adjusted in position along the lathe body; further comprises a secondary flywheel assembly installed on the lathe body and capable of being adjusted in position along the lathe body, the secondary flywheel assembly is arranged on one side of the wheel hub clamping assembly. The polishing device for manufacturing automobile wheel hub is provided with a tool holder and a centrifugal conversion tool group, when the wheel hub rotates, the high-speed wheel rotates at ordinary speed, the plane part of the multiple sets of cutting tools contacts the wheel hub, grinding and polishing can be realized, under the action of high-speed rotation of the high-speed wheel, the contact surface of the cutting tool is converted from the plane part to the tip part, therefore, higher-precision machining can be realized, and different effects are presented under different rotating speeds, and multiple effects such as grinding, wire drawing and polishing are realized at one time.

Description

Technical Field

[0001] This invention relates to the field of wire drawing lathes for wheel hub manufacturing, specifically a polishing device for manufacturing automobile wheel hubs. Background Technology

[0002] The wheel hub is the part of the wheel where the axle is mounted; it's commonly referred to as the "wheel rim" or "rim." Wheel hubs easily accumulate dirt, and if not cleaned regularly, they can corrode and deform, potentially creating safety hazards. Therefore, special attention must be paid to wheel hub maintenance. Polishing refers to a processing method that uses mechanical, chemical, or electrochemical processes to reduce the surface roughness of a workpiece, resulting in a bright, smooth surface. It involves using polishing tools and abrasive particles or other polishing media to refine the surface of a workpiece.

[0003] Brushing is a common wheel surface polishing method that can effectively remove the oxide layer on the wheel surface, change the texture of the wheel surface, or make it present a better visual effect. Generally speaking, the side of the wheel is roughly the surface of revolution, and the side of the spokes generally does not need to be brushed.

[0004] After automotive wheel hubs are manufactured and cast, their surfaces generally need to be polished. Polishing automotive wheel hubs usually requires the use of specialized polishing equipment. The existing wire drawing process first locks the wheel hub onto the spindle of the lathe. The wire drawing and polishing process of automotive wheel hubs requires at least two processes: rough grinding and fine wire drawing. How to achieve a more refined wire drawing effect and how to change tools without stopping the machine are difficult technical challenges to overcome. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a polishing device for manufacturing automobile wheel hubs, solving the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: a polishing device for manufacturing automobile wheel hubs, including a lathe body and a wheel hub clamping assembly mounted on the lathe body, wherein the wheel hub clamping assembly can be adjusted in position laterally along the lathe body; It also includes an auxiliary flywheel assembly, which is mounted on the lathe body and can be adjusted in position laterally. The auxiliary flywheel assembly is located on one side of the hub clamping assembly. The secondary flywheel assembly includes a high-speed wheel assembly, a tool holder, and a centrifugal conversion tool set. The tool holder is installed in the high-speed wheel assembly and can adjust the distance between itself and the center of the high-speed wheel assembly along its radial line. The centrifugal conversion tool set is installed in the tool holder and is slidably connected to the tool holder. The high-speed wheel assembly can adjust the extension length of the centrifugal conversion tool set from the tool holder along the axial direction of the high-speed wheel assembly. The high-speed wheel assembly can switch the rotation speed to control the switching between grinding, polishing, and wire drawing.

[0007] Preferably, the auxiliary flywheel assembly further includes a Y-axis host, which is mounted on the lathe body and slides in the same direction as the hub clamping assembly. The high-speed wheel assembly is mounted on the Y-axis host, which can control the rotation of the high-speed wheel assembly and can also control the movement of the high-speed wheel assembly along the radial line of the hub clamping assembly.

[0008] Preferably, the high-speed wheel assembly includes a drive wheel, a balance wheel, and a counterweight A. The drive wheel is connected to the rotary output shaft of the Y-axis host. The balance wheel is located on one side of the drive wheel and is suspended and fixed to the drive wheel. The counterweight A is fixedly installed on the balance wheel and is located on the side corresponding to the tool holder. A servo telescopic top plate is fixedly installed on the side of the drive wheel near the balance wheel. The tool holder is connected to the balance wheel using a screw adjuster and corresponds to the servo telescopic top plate.

[0009] Preferably, the centrifugal conversion blade assembly includes a slide, a guide rail, and a blade box. The blade box is fixed to the slide. Multiple sets of guide rails are provided, all of which are fixed to the blade box and the slide. The blade box and the slide are slidably connected to the blade holder through the guide rail. A push rod is fixedly installed on one side of the slide. The other end of the push rod passes through the blade holder and contacts the servo telescopic top plate. A spring A is sleeved on the end of the push rod between the blade holder and the slide. The two ends of the spring A are fixed to the blade holder and the slide, respectively. The tool box contains multiple cutting tools arranged side by side. The middle part of the cutting tool is hinged to the tool box by a rotating shaft. The cutting end of the cutting tool is outside the tool box. The other end of the cutting tool is hinged together by a locking block. A sliding slide is installed in the slide rail. The side of the slide rail near the locking block is connected to the locking block by multiple springs B. One end of the slide rail is connected to the end of the slide rail by a spring C. A counterweight B is fixedly installed at the other end of the slide rail. The counterweight B is located at the end of the slide rail away from the center of the balance wheel.

[0010] Preferably, the upper and lower inner walls of the tool holder are provided with sliding grooves, and the guide rail slides in cooperation with the sliding grooves.

[0011] Preferably, the end of the cutting tool is a flat end, and the two sides of the end are pointed structures.

[0012] Preferably, the hub clamping assembly includes an X-axis main unit, a hydraulic chuck, and a hub center positioning rod. The hydraulic chuck is mounted on the rotating shaft of the X-axis main unit, and the hub center positioning rod is mounted at the center of the hydraulic chuck. A retaining ring is fixedly mounted on the hub center positioning rod to abut against the center hole of the hub.

[0013] Preferably, the lathe body is equipped with two sets of servo slide rails, with the Y-axis main unit and the X-axis main unit mounted on the servo slide rails for changing positions.

[0014] Preferably, the balance wheel is provided with a groove on the side opposite to the counterweight A, and the tool holder is locked in the groove and slidably connected to it.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This polishing device for manufacturing automobile wheel hubs, by setting a secondary flywheel assembly, can rotate the cutting tool and the wheel hub simultaneously. By setting it to the opposite direction of the wheel hub's rotation, the wheel hub can be ground and polished when the cutting tool contacts the wheel hub. Compared with traditional pure tool grinding, the relative rotation method has higher grinding efficiency, and the processing area is larger and the precision is higher.

[0016] 2. This polishing device for manufacturing automobile wheel hubs, by setting up a tool holder and a centrifugal tool conversion group, allows the high-speed wheel to rotate at a normal speed while the wheel hub rotates. The flat parts of multiple sets of cutting tools contact the wheel hub, enabling grinding and polishing. Under the action of high-speed rotation of the high-speed wheel, the counterweight B pulls the slide table to move, thereby causing multiple cutting tools to shift. As a result, the contact surface of the cutting tools changes from the flat part to the pointed part, thus achieving higher precision machining and producing a wire drawing effect. Moreover, the effect varies at different speeds, achieving multiple effects such as grinding, wire drawing, and polishing in one operation.

[0017] 3. The polishing device for manufacturing automobile wheel hubs, by setting a servo telescopic top plate and push rod, can control the distance of the internal centrifugal conversion tool group extending outward from the tool holder when the balance wheel rotates with the tool holder. During grinding and polishing, the position of the tool can be continuously adjusted to change the contact force between the tool and the wheel hub.

[0018] 4. This polishing device for manufacturing automobile wheel hubs can be manually adjusted by setting a screw adjuster, allowing for manual adjustment of the distance between the tool holder and the center of the balance wheel, or the feed distance between the tool holder and the wheel hub can be automatically adjusted by the Y-axis main unit. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a front view of the structure of the present invention; Figure 3 This is a top view of the structure of the present invention; Figure 4 This is a structural diagram of the hub clamping assembly of the present invention; Figure 5 This is a structural diagram of the secondary flywheel assembly of the present invention; Figure 6 This is a schematic diagram of the high-speed wheel assembly of the present invention; Figure 7 This is a structural diagram of the balance wheel and tool holder of the present invention; Figure 8 This is a diagram showing the internal structure of the tool holder of the present invention; Figure 9This is a schematic diagram of the centrifugal conversion blade assembly of the present invention; Figure 10 This is a schematic diagram of the cutting tool of the present invention.

[0020] In the diagram: 1. Lathe body; 2. Hub clamping assembly; 201. X-axis main unit; 202. Hydraulic chuck; 203. Hub center positioning rod; 204. Retaining ring; 3. Secondary flywheel assembly; 301. High-speed wheel assembly; 3011. Drive wheel; 3012. Balance wheel; 3013. Counterweight A; 3014. Servo telescopic top plate; 3015. Screw adjuster; 302. Tool post; 303. Centrifugal conversion tool set; 3031. Slide rail; 3032. Guide rail; 3033. Tool box; 3034. Push rod; 3035. Spring A; 3036. Cutting tool; 3037. Clamping block; 3038. Slide table; 3039. Spring C; 30310. Counterweight B; 30311. Spring B; 304. Y-axis main unit; 305. Slide groove; 4. Servo slide rail. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0022] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0023] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0025] like Figure 1-10 As shown, a polishing apparatus for manufacturing automobile wheel hubs includes a lathe body 1 and a wheel hub clamping assembly 2 mounted on the lathe body 1. The wheel hub clamping assembly 2 is adjustable in position laterally along the lathe body 1.

[0026] It also includes a secondary flywheel assembly 3, which is mounted on the lathe body 1 and can be adjusted in position laterally. The secondary flywheel assembly 3 is located on one side of the hub clamping assembly 2.

[0027] The secondary flywheel assembly 3 includes a high-speed wheel assembly 301, a tool holder 302, and a centrifugal conversion tool group 303. The tool holder 302 is installed in the high-speed wheel assembly 301 and can adjust the distance between itself and the center of the high-speed wheel assembly 301 along the radial line of the high-speed wheel assembly 301. The centrifugal conversion tool group 303 is installed in the tool holder 302 and is slidably connected to the tool holder 302. The high-speed wheel assembly 301 can adjust the extension length of the centrifugal conversion tool group 303 from the tool holder 302 along the axial direction of the high-speed wheel assembly 301. The high-speed wheel assembly 301 can switch the rotation speed to control the switching between grinding, polishing, and wire drawing.

[0028] The lathe body 1 includes a control system, a hydraulic system, and an electrical system, which are used to control the operation and movement of the hub clamping assembly 2 and the auxiliary flywheel assembly 3.

[0029] The lathe body 1 has an overall L-shaped structure. The hub clamping assembly 2, which is used to drive the hub to rotate, is installed at the bottom. The auxiliary flywheel assembly 3, which is used to grind the hub, is installed at the rear. The auxiliary flywheel assembly 3 is located to the left of the hub clamping assembly 2. The two can move relative to each other and achieve the machining effect when they come into contact.

[0030] In an optional embodiment, the secondary flywheel assembly 3 further includes a Y-axis host 304, which is mounted on the lathe body 1 and slides in the same direction as the hub clamping assembly 2. The high-speed wheel assembly 301 is mounted on the Y-axis host 304, which can control the rotation of the secondary high-speed wheel assembly 301. The Y-axis host 304 can also control the high-speed wheel assembly 301 to move along the radial line of the hub clamping assembly 2.

[0031] In this embodiment, the Y-axis host 304 is equipped with a motor and a gear transmission mechanism inside. The Y-axis host 304 is also equipped with a lateral moving component that moves in the Y-axis direction. Its body can move along the X-axis, while the Y-axis direction is used to control the high-speed wheel assembly 301 to move towards the center of the wheel hub. The servo motor and lead screw combination can be selected for controlling the Y-axis direction. The motor and the gear transmission mechanism are both installed in the head in the Y-axis direction.

[0032] In an optional embodiment, the high-speed wheel assembly 301 includes a drive wheel 3011, a balance wheel 3012, and a counterweight A3013. The drive wheel 3011 is connected to the rotary output shaft of the Y-axis host 304. The balance wheel 3012 is located on one side of the drive wheel 3011 and is suspended and fixed to the drive wheel 3011. The counterweight A3013 is fixedly installed on the balance wheel 3012 and is located on the side corresponding to the tool holder 302. A servo telescopic top plate 3014 is fixedly installed on the side of the drive wheel 3011 close to the balance wheel 3012. The tool holder 302 is connected to the balance wheel 3012 by a screw adjuster 3015 and corresponds to the servo telescopic top plate 3014.

[0033] In this embodiment, the drive wheel 3011 is equipped with a main shaft for connecting to the motor, while the balance wheel 3012 is a rotational force output component. The two are connected by several transmission shafts. The counterweight A3013 is located at the eccentric position of the balance wheel 3012. The counterweight A3013 is a combination of several iron discs, and the weight can be adjusted according to the requirements. Basically, the weight is not adjusted without changing the tool. The servo telescopic top plate 3014 is controlled by a servo motor or hydraulic system.

[0034] In an optional embodiment, the centrifugal conversion blade assembly 303 includes a slide rail 3031, a guide rail 3032, and a blade box 3033. The blade box 3033 is fixed to the slide rail 3031. Multiple sets of guide rails 3032 are provided, all of which are fixed to the blade box 3033 and the slide rail 3031. The blade box 3033 and the slide rail 3031 are slidably connected to the blade holder 302 through the guide rail 3032. A push rod 3034 is fixedly installed on one side of the slide rail 3031. The other end of the push rod 3034 passes through the blade holder 302 and contacts the servo telescopic top plate 3014. A spring A3035 is sleeved on the end of the push rod 3034 between the blade holder 302 and the slide rail 3031. The two ends of the spring A3035 are fixed to the blade holder 302 and the slide rail 3031, respectively.

[0035] The tool holder 3033 contains multiple cutting tools 3036 arranged side by side. The middle part of the cutting tool 3036 is hinged to the tool holder 3033 by a rotating shaft. The cutting end of the cutting tool 3036 is outside the tool holder 3033. The other end of the cutting tool 3036 is hinged together by a locking block 3037. A sliding slide 3038 is installed in the slide rail 3031. The side of the slide 3038 near the locking block 3037 is connected to the locking block 3037 by multiple springs B30311. One end of the slide 3038 is connected to the end of the slide rail 3031 by a spring C3039. A counterweight B30310 is fixedly installed at the other end of the slide 3038. The counterweight B30310 is located at the end of the slide rail 3031 away from the center of the balance wheel 3012.

[0036] In this embodiment, multiple cutting tools 3036 are provided. To achieve the best machining effect, a minimum of three are selected. Different specifications of cutting tools 3036 can be selected. Some cutting tools 3036 can be modified to replace their cutting tips with grinding heads. A locking block 3037 connects the tails of all cutting tools 3036. When the locking block 3037 moves, it can stretch the spring C3039. The spring C3039 is used to keep the locking block 3037 returning to its original position, while the spring B30311 can always maintain a soft connection with the locking block 3037 when the slide table 3038 moves.

[0037] In an optional embodiment, the upper and lower inner walls of the tool holder 302 are provided with sliding grooves 305, and the guide rail 3032 slides in cooperation with the sliding grooves 305.

[0038] In this embodiment, the guide rail 3032 can change position relative to the tool holder 302, and lubricating oil is applied between the slide groove 305 and the guide rail 3032.

[0039] In an optional embodiment, the cutting tool 3036 has a flat end with pointed structures on both sides.

[0040] In this embodiment, the cutting tool 3036 can be a grinding head or a cutting head, and can be used for various effects such as rust removal, cutting and fine grinding. In addition, the tip structure of the cutting tool 3036 is made of diamond grinding head for wire drawing or fine grinding.

[0041] In an optional embodiment, the wheel hub clamping assembly 2 includes an X-axis main unit 201, a hydraulic chuck 202, and a wheel hub center positioning rod 203. The hydraulic chuck 202 is mounted on the rotating shaft of the X-axis main unit 201, and the wheel hub center positioning rod 203 is mounted at the center of the hydraulic chuck 202. A retaining ring 204 is fixedly mounted on the wheel hub center positioning rod 203 to abut against the center hole of the wheel hub.

[0042] In this embodiment, the X-axis host 201 is also equipped with a motor and gear transmission mechanism. The hydraulic chuck 202 is a device in the prior art, used to clamp the inner wall of the hub and prevent the outer edge of the hub from being damaged.

[0043] In an optional embodiment, two sets of servo slide rails 4 are mounted on the lathe body 1, and the Y-axis host 304 and the X-axis host 201 are mounted on the servo slide rails 4 for changing positions.

[0044] In this embodiment, the servo slide rail 4 is used to control the lateral movement of the Y-axis host 304 and the X-axis host 201.

[0045] In an optional embodiment, a groove 305 is provided on the side of the balance wheel 3012 opposite to the counterweight A3013, and the tool holder 302 is locked in the groove 305 and slidably connected thereto.

[0046] In use, the car wheel hub is clamped on the wheel hub clamping assembly 2. The center position of the wheel hub is located by the wheel hub center positioning rod 203. After clamping, the X-axis host 201 is started, and the wheel hub begins to rotate under the drive of the hydraulic chuck 202. The X-axis host 201 can be automatically controlled to move left and right on the lathe body 1.

[0047] After setting the cutting tool 3036, start the Y-axis host 304, which drives the drive wheel 3011 to rotate, thereby balancing the wheel 3012 to rotate simultaneously. During rotation, control the Y-axis host 304 or the X-axis host 201 to move, or both to move relative to each other simultaneously, so that the tool can contact the side of the hub. After the rotating tool contacts the side of the hub, it can grind it.

[0048] When the balance wheel 3012 rotates, the servo telescopic top plate 3014 can intermittently apply pressure to the tool, thereby enabling the tool to perform different machining forces on a hub surface. This can be used to polish concave hub surfaces or to frequently change the contact force of the cutting tool 3036.

[0049] After grinding to a certain extent, increasing the rotation speed of the balance wheel can cause the counterweight B30310 to slide along the slide 3031, thereby pulling the locking block 3037 so that all the cutting tools 3036 are offset together along an angle. After the offset, the cutting tool 3036 no longer contacts the hub with a flat part, but with a pointed part with a certain included angle. The higher moving speed and smaller contact area can achieve a more refined polishing effect.

[0050] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0051] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A polishing apparatus for manufacturing automobile wheel hubs, comprising a lathe body, characterized in that: It also includes a hub clamping assembly mounted on the lathe body, the hub clamping assembly being able to adjust its position laterally along the lathe body; It also includes an auxiliary flywheel assembly, which is mounted on the lathe body and can be adjusted in position laterally. The auxiliary flywheel assembly is located on one side of the hub clamping assembly. The secondary flywheel assembly includes a high-speed wheel assembly, a tool holder, and a centrifugal conversion tool set. The tool holder is installed in the high-speed wheel assembly and can adjust the distance between itself and the center of the high-speed wheel assembly along its radial line. The centrifugal conversion tool set is installed in the tool holder and is slidably connected to the tool holder. The high-speed wheel assembly can adjust the extension length of the centrifugal conversion tool set from the tool holder along the axial direction of the high-speed wheel assembly. The high-speed wheel assembly can switch the rotation speed to control the switching between grinding, polishing, and wire drawing. The auxiliary flywheel assembly also includes a Y-axis host, which is mounted on the lathe body and slides in the same direction as the hub clamping assembly. The high-speed wheel assembly is mounted on the Y-axis host, which can control the rotation of the high-speed wheel assembly and can also control the movement of the high-speed wheel assembly along the radial line of the hub clamping assembly. The high-speed wheel assembly includes a drive wheel, a balance wheel, and a counterweight A. The drive wheel is connected to the rotary output shaft of the Y-axis host. The balance wheel is located on one side of the drive wheel and is suspended and fixed to the drive wheel. The counterweight A is fixedly installed on the balance wheel and is located on the side corresponding to the tool holder. A servo telescopic top plate is fixedly installed on the side of the drive wheel near the balance wheel. The tool holder is connected to the balance wheel using a screw adjuster and corresponds to the servo telescopic top plate. The centrifugal conversion blade assembly includes a slide, a guide rail, and a blade box. The blade box is fixed to the slide. Multiple sets of guide rails are provided, all of which are fixed to the blade box and the slide. The blade box and the slide are slidably connected to the blade holder through the guide rail. A push rod is fixedly installed on one side of the slide. The other end of the push rod passes through the blade holder and contacts the servo telescopic top plate. A spring A is sleeved on the end of the push rod between the blade holder and the slide. The two ends of the spring A are fixed to the blade holder and the slide, respectively. The tool box contains multiple cutting tools arranged side by side. The middle part of the cutting tool is hinged to the tool box by a rotating shaft. The cutting end of the cutting tool is outside the tool box. The other end of the cutting tool is hinged together by a locking block. A sliding slide is installed in the slide rail. The side of the slide rail near the locking block is connected to the locking block by multiple springs B. One end of the slide rail is connected to the end of the slide rail by a spring C. A counterweight B is fixedly installed at the other end of the slide rail. The counterweight B is located at the end of the slide rail away from the center of the balance wheel.

2. The polishing apparatus for manufacturing automobile wheel hubs according to claim 1, characterized in that: The upper and lower inner walls of the tool holder are provided with sliding grooves, and the guide rail slides in cooperation with the sliding grooves.

3. The polishing apparatus for manufacturing automobile wheel hubs according to claim 2, characterized in that: The cutting tool has a flat end and pointed structures on both sides of the end.

4. The polishing apparatus for manufacturing automobile wheel hubs according to claim 3, characterized in that: The hub clamping assembly includes an X-axis main unit, a hydraulic chuck, and a hub center positioning rod. The hydraulic chuck is mounted on the rotating shaft of the X-axis main unit, and the hub center positioning rod is mounted at the center of the hydraulic chuck. A retaining ring is fixedly installed on the hub center positioning rod to abut against the center hole of the hub.

5. The polishing apparatus for manufacturing automobile wheel hubs according to claim 4, characterized in that: The lathe body is equipped with two sets of servo slide rails. The Y-axis main unit and the X-axis main unit are mounted on the servo slide rails for changing position.

6. The polishing apparatus for manufacturing automobile wheel hubs according to claim 5, characterized in that: The balance wheel is provided with a groove on the side opposite to the counterweight A, and the tool holder is locked in the groove and slidably connected to it.

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