A machining device for an automobile wheel hub and a machining method thereof

Abstract

The application relates to a machining device and a machining method of an automobile hub, and relates to the technical field of automobile hubs. The machining device comprises a rack, a servo motor mounted on the rack, a working disc drivingly connected to the output end of the servo motor, a sliding block radially slidingly connected in the working disc, a polishing piece slidingly arranged on the sliding block in the vertical direction, a guide block mounted in the working disc, a guide surface arranged at the bottom of the guide block, the top end of the polishing piece slidingly connected with the guide surface, a spring one fixed to one end of the sliding block, and the other end of the spring one fixed to the working disc. The application can complete twice polishing of different annular surfaces of the hub through controlling the acceleration and deceleration of the servo motor once, improves the machining efficiency, the polishing head polishes different annular surfaces of the hub through different positions, reduces the abrasion amount of the polishing head, prolongs the service life, the machining device reduces the number of driving sources, thereby reducing the investment cost of the driving sources and reducing the difficulty of electric control operation.

Description

Technical Field

[0001] This application relates to the field of automotive wheel hub technology, and in particular to an automotive wheel hub processing apparatus and processing method. Background Technology

[0002] A car wheel rim is a metal component that supports the tire's inner contour. Car wheel rims are cylindrical in shape, and their center is mounted on the axle. Wheel rims are also called wheel hubs, steel rims, or rims. They can be divided into many types based on their diameter, width, molding method, and materials. Meeting basic usage requirements for car wheel rims is quite simple; current improvements mainly focus on their appearance.

[0003] Reference Figure 1 This is a type of automotive wheel hub in the related technology. The front of the wheel hub is provided with multiple reinforcing ribs. The surfaces of the reinforcing ribs are located on multiple annular surfaces, including annular surface 101 near the center of the wheel hub, annular surface 102 located outside annular surface 101, and annular surface 103 located outside annular surface 102. Annular surface 101 is used to contact nuts or caps, while annular surface 102 and annular surface 103 are responsible for the main appearance display effect. The slopes of annular surface 101, annular surface 102, and annular surface 103 are all different.

[0004] The front of the wheel hub needs to be polished to make the surface of the reinforcing ribs shiny and improve its appearance. For the wheel hubs described in the aforementioned technologies, since the front of the wheel hub has multiple surfaces with varying slopes, each surface needs to be polished separately, resulting in low efficiency. Summary of the Invention

[0005] This application provides a processing device and method for automobile wheel hubs, which can automatically complete the grinding of the front side of the wheel hub in one go, thus improving processing efficiency.

[0006] Firstly, the processing apparatus for automobile wheel hubs provided in this application adopts the following technical solution: A processing device for automobile wheel hubs includes a frame and a servo motor mounted on the frame. The output end of the servo motor is drivenly connected to a work plate. A slider is slidably connected radially inside the work plate. A grinding component is slidably disposed on the slider in the vertical direction. A guide block is installed inside the work plate. The bottom of the guide block is provided with a guide surface. The top end of the grinding component is slidably connected to the guide surface. A spring is fixed to one end of the slider, and the other end of the spring is fixed to the work plate.

[0007] By adopting the above technical solution, the servo motor is started to drive the working disc to rotate. The grinding part first grinds the area near the center of the hub. Then, the servo motor speed is increased. As the speed of the working disc increases, the centrifugal force of the grinding part also increases. Therefore, the grinding part gradually compresses the spring and moves to the outside of the working disc. At the same time, the tip of the grinding part moves along the guide surface, and the grinding part gradually completes the grinding of the entire hub surface, conforming to the uneven surface shape of the hub. By controlling the acceleration and deceleration of the servo motor once, two grinding operations on different annular surfaces of the hub can be completed, improving processing efficiency.

[0008] Optionally, the grinding component includes a sleeve and a slide rod slidably connected to the inner wall of the sleeve. The grinding component is slidably connected to the slider through the outer wall of the sleeve. A sliding seal is established between the sleeve and the slide rod through a sealing ring. A sealed air cavity is formed between the inner wall of the sleeve and the slide rod.

[0009] By adopting the above technical solution, when the slide bar moves upward relative to the sleeve, the air chamber is compressed and generates a reaction force. This reaction force enables the grinding head to press firmly against the surface of the hub, ensuring the grinding effect.

[0010] Optionally, the cross-section of the slide rod is not circular, and the inner wall shape of the sleeve corresponds to that of the slide rod.

[0011] By adopting the above technical solution, relative rotation is avoided through the non-circular cross-section of the slide rod and the inner wall of the sleeve, allowing the grinding part to contact the hub at a fixed position.

[0012] Optionally, the outer wall cross-section of the sleeve is not circular, and the slider has a sliding hole corresponding to the shape of the outer wall of the sleeve.

[0013] By adopting the above technical solution, through the non-circular cross-section sliding hole and sleeve, relative rotation is avoided, and the grinding part contacts the hub at a certain position.

[0014] Optionally, the grinding component also includes a grinding head fixed to the bottom end of the slide bar, the grinding head having multiple grinding surfaces corresponding to different annular surfaces on the hub.

[0015] By adopting the above technical solution, the grinding head grinds different annular surfaces of the wheel hub from different positions, reducing the wear of the grinding head and extending its service life.

[0016] Optionally, a balance block is slidably connected in the radial direction inside the working disk. The balance block and the slider are located on the radial sides of the working disk, respectively. A spring is fixed to one end of the balance block, and the other end of the spring is fixed to the working disk.

[0017] By adopting the above technical solution, during the rotation of the working disc, the balance block also moves radially along the working disc under the action of centrifugal force, and spring two provides restoring force for the movement of the balance block. The balance block is used to balance the change in the center of gravity of the working disc after the grinding workpiece moves, avoid the generation of eccentric force when the working disc rotates, and make the working disc rotate smoothly.

[0018] Optionally, the grinding component further includes a magnet fixed to the top of the sleeve, the top surface of the magnet being an arc surface, and the guide block having an iron sheet attracted to the magnet.

[0019] By adopting the above technical solution, the iron sheet and the magnet attract each other, so that the magnet can always stick to the guide surface, allowing the slide rod to move in accordance with the guide surface, and the slide rod always remains vertical.

[0020] Secondly, this application provides a method for processing automobile wheel hubs, employing the following technical solution: A method for processing automobile wheel hubs, using the automobile wheel hub processing apparatus according to any one of claims 1-8, is characterized by comprising the following steps: Step S1: Place the wheel hub on the worktable below the work plate, and raise the worktable to bring the wheel hub to the processing position; Step S2: Start the servo motor to drive the worktable to rotate, and the grinding workpiece rotates to complete the grinding of the first ring surface; Step S3: Gradually increase the speed of the servo motor. Under the action of centrifugal force, the grinding part moves to the outside of the working plate. The top of the grinding part moves in contact with the guide surface to complete the grinding of the second and third annular surfaces. Step S4: Gradually reduce the speed of the servo motor. Under the elastic force of spring one, the grinding part moves towards the center of the working plate and performs secondary grinding on ring surface three, ring surface two, and ring surface one in sequence. Step S5: Stop the machine, lower the height of the worktable, and replace it with another wheel hub.

[0021] By adopting the above technical solution and completing the grinding of the wheel hub end face through the above steps, the grinding of different annular surfaces of the wheel hub can be completed twice by controlling the acceleration and deceleration of the servo motor once, thereby improving the processing efficiency.

[0022] Optionally, the guide block is made of sintered clay, and the iron sheet is installed by insertion after the clay is formed but before it is cured.

[0023] By adopting the above technical solution, since clay can be molded into any shape, the shapes of toroidal surface one, toroidal surface two, and toroidal surface three can be replicated by directly applying clay to the wheel hub. A guide block can then be formed from this clay slice. Using clay, an accurate wheel hub toroidal surface curve can be obtained in one go, reducing adjustments and rework.

[0024] Optionally, the guide block is generated by 3D printing, and a slot for inserting iron sheets is reserved during 3D printing.

[0025] By adopting the above technical solution, automobile wheel hubs generally have three-dimensional images. The cross-sectional curves of toroidal surface one, toroidal surface two, and toroidal surface three can be directly derived from the three-dimensional image, and the accurate wheel hub toroidal surface curve can be obtained in one go.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. By controlling the acceleration and deceleration of the servo motor once, two grinding operations on different annular surfaces of the wheel hub can be completed, improving processing efficiency; 2. The grinding head grinds different annular surfaces of the wheel hub from different positions, reducing the wear of the grinding head and extending its service life; 3. The number of drive sources is reduced, thereby reducing the investment cost of drive sources and reducing the difficulty of electronic control operation. Attached Figure Description

[0027] Figure 1 These are a perspective view and sectional view of a wheel hub in related technologies; Figure 2 This is a cross-sectional view of a processing device for automobile wheel hubs according to Embodiment 1; Figure 3 This is a partial view of Embodiment 1; Figure 4 yes Figure 2 Enlarged view of point A.

[0028] Explanation of reference numerals in the attached drawings: 101, Toroidal surface one; 102, Toroidal surface two; 103, Toroidal surface three; 1, Frame; 11, Servo motor; 2, Working disc; 3, Slider; 4, Grinding component; 5, Guide block; 51, Guide surface; 21, Spring one; 22, Slide rail; 23, Counterweight; 41, Sleeve; 42, Slide rod; 43, Magnet; 44, Grinding head; 31, Sliding hole; 45, Air chamber; 52, Iron sheet; 441, Grinding surface one; 442, Grinding surface two; 443, Grinding surface three; 24, Balance block; 25, Partition plate; 26, Spring two. Detailed Implementation

[0029] The present application will be further described in detail below with reference to the accompanying drawings.

[0030] Example 1: Reference Figure 2 This embodiment discloses a processing device for automobile wheel hubs, including a frame 1 and a servo motor 11 mounted on the frame 1. The output end of the servo motor 11 is connected to a worktable 2, and the servo motor 11 can be controlled to precisely adjust its speed. A slider 3 is slidably connected radially inside the worktable 2, and a grinding element 4 is slidably disposed on the slider 3 in the vertical direction.

[0031] Reference Figure 2 and Figure 3 A guide block 5 is bolted inside the working disc 2. The bottom of the guide block 5 has a guide surface 51, the shape of which corresponds to the longitudinal cross-sectional shape of the combined annular surface 101, annular surface 102, and annular surface 103. The top of the grinding part 4 is slidably connected to the guide surface 51. One end of the slider 3 is fixed with a spring 21, and the other end of the spring 21 is fixed to the working disc 2. The spring 21 is located on the side of the slider 3 furthest from the center of the working disc 2. A slide rail 22 for sliding connection of the slider 3 is fixed inside the working disc 2. A counterweight 23 is bolted inside the working disc 2. The counterweight 23 and the guide block 5 are located on opposite radial sides of the working disc 2. When the working disc 2 rotates, the counterweight 23 balances the weight of the guide block 5, preventing eccentric force from occurring during rotation of the working disc 2.

[0032] The grinding component 4 includes a sleeve 41, a slide rod 42 slidably connected to the inner wall of the sleeve 41, a magnet 43 fixed to the top of the sleeve 41, and a grinding head 44 fixed to the bottom of the slide rod 42. The grinding component 4 is slidably connected to the slider 3 through the outer wall of the sleeve 41. The cross-section of the slide rod 42 is non-circular, preferably rectangular, and the shape of the inner wall of the sleeve 41 corresponds to that of the slide rod 42. The cross-section of the outer wall of the sleeve 41 is non-circular, preferably rectangular, and the slider 3 has a sliding hole 31 corresponding to the shape of the outer wall of the sleeve 41. By using the non-circular cross-section of the slide rod 42 and the sleeve 41, relative rotation is avoided, allowing the grinding head 44 to contact the hub at a defined position.

[0033] A sliding seal is established between the sleeve 41 and the slide rod 42 through a sealing ring. A sealed air cavity 45 is formed between the inner wall of the sleeve 41 and the slide rod 42. When the slide rod 42 moves upward relative to the sleeve 41, the air cavity 45 is compressed and generates a reaction force. This reaction force allows the grinding head 44 to press firmly against the surface of the hub, ensuring the grinding effect. The top surface of the magnet 43 is an arc surface. The guide block 5 is fixed with an iron piece 52 that attracts the magnet 43. The iron piece 52 is curved and set close to the guide surface 51. The iron piece 52 and the magnet 43 cooperate to allow the slide rod 42 to move in accordance with the guide surface 51, and the slide rod 42 always remains vertical.

[0034] Reference Figure 4 The grinding head 44 is provided with multiple grinding surfaces corresponding to different annular surfaces on the wheel hub. Specifically, the grinding surfaces include grinding surface 441 corresponding to annular surface 101, grinding surface 442 corresponding to annular surface 202, and grinding surface 443 corresponding to annular surface 303.

[0035] Reference Figure 2A balance block 24 is slidably connected radially inside the working disc 2. The balance block 24 and the slider 3 are located on opposite radial sides of the working disc 2. The balance block 24 is slidably connected to the slide rail 22. A partition 25 is fixed in the middle of the slide rail 22, separating the balance block 24 and the slider 3. A second spring 26 is fixed to one end of the balance block 24, and the other end of the second spring 26 is fixed to the working disc 2. The second spring 26 is located on the side of the balance block 24 away from the center of the working disc 2.

[0036] The implementation principle of a processing device for automobile wheel hubs according to an embodiment of this application is as follows: This processing device adopts a form in which the workpiece does not rotate and the grinding part 4 rotates. Under the elastic force of spring 21, the grinding head 44 is initially located near the center of the working disc 2, that is, near the center of the wheel hub.

[0037] The servo motor 11 is started to drive the working disc 2 to rotate. The grinding head 44 first grinds the annular surface 101 on the hub through the first grinding surface 441. Then, the servo motor 11 is controlled to increase the speed. As the speed of the working disc 2 increases, the centrifugal force of the grinding part 4 also increases. Therefore, the grinding part 4 gradually compresses the spring 21 and moves to the outside of the working disc 2. Then, the grinding head 44 grinds the annular surface 102 on the hub through the second grinding surface 442. As the speed of the working disc 2 continues to increase, the grinding part 4 continues to move to the outside of the working disc 2. Then, the grinding head 44 grinds the annular surface 103 on the hub through the third grinding surface 443.

[0038] During the rotation of the working disc 2, the balance block 24 also moves radially along the working disc 2 under the action of centrifugal force. The balance block 24 is used to balance the change in the center of gravity of the working disc 2 after the grinding part 4 moves, so as to avoid the generation of eccentric force when the working disc 2 rotates and make the working disc 2 rotate smoothly.

[0039] After the grinding head 44 finishes grinding the third annular surface 103 on the hub, the speed of the servo motor 11 is gradually reduced. Then the grinding head 44 moves in the opposite direction along the radial direction of the working disc 2, so that the grinding head 44 performs secondary grinding on the third annular surface 103, the second annular surface 102, and the first annular surface 101 of the hub in sequence, thereby improving the grinding effect and making the surface of the hub brighter.

[0040] In summary, this application can complete two grinding operations on different annular surfaces of the wheel hub by controlling the servo motor 11 to accelerate and decelerate once. Furthermore, the grinding head 44 grinds different annular surfaces of the wheel hub from different positions, which reduces the wear of the grinding head 44 and extends its service life.

[0041] Example 2: A method for processing automobile wheel hubs, using the automobile wheel hub processing apparatus of Embodiment 1, includes the following steps: Preliminary step: Fabrication of guide block 5. Guide block 5 is made of sintered clay. Since clay can be molded into any shape, the shapes of ring surface 101, ring surface 102, and ring surface 103 can be replicated by directly attaching clay to the wheel hub. Slicing the clay will form guide block 5. After the clay is formed but before it hardens, the iron plate 52 is installed by insertion. At this time, the clay is still soft, so the iron plate 52 can be inserted directly, making installation convenient.

[0042] In another embodiment, the guide block 5 is generated by 3D printing, and a slot for inserting the iron sheet 52 is reserved during 3D printing. Car wheel hubs generally have 3D models, and the cross-sectional curves of toroidal surface 101, toroidal surface 202, and toroidal surface 303 can be directly derived from the 3D model.

[0043] Step S1: Place the wheel hub on the worktable below the worktable 2, and raise the worktable to bring the wheel hub to the processing position.

[0044] The worktable has slots for the wheel hubs to be inserted. Due to the significant weight of the wheel hubs, clamps are not required. The lifting of the worktable is accomplished by a pneumatic cylinder, hydraulic cylinder, or electric screw mechanism.

[0045] Step S2: Start the servo motor 11 to drive the work plate 2 to rotate, and the grinding part 4 rotates to complete the grinding of the annular surface 101.

[0046] Under the elastic force of spring 21, the grinding head 44 is initially positioned near the center of the working disc 2, that is, near the center of the hub. The servo motor 11 is started to drive the working disc 2 to rotate, and the grinding head 44 first grinds the annular surface 101 on the hub through the grinding surface 441.

[0047] Step S3: Gradually increase the speed of the servo motor 11. The grinding part 4 moves to the outside of the working plate 2 under the action of centrifugal force. The top of the grinding part 4 moves to fit the guide surface 51, completing the grinding of the second annular surface 102 and the third annular surface 103.

[0048] As the servo motor 11 increases its speed, the speed of the working disc 2 also increases, and the centrifugal force of the grinding component 4 also increases. Therefore, the grinding component 4 gradually compresses the spring 21, and moves the grinding component 4 to the outside of the working disc 2. Then, the grinding head 44 grinds the annular surface 102 on the hub through the grinding surface 442. As the speed of the working disc 2 continues to increase, the grinding component 4 continues to move to the outside of the working disc 2, and the grinding head 44 grinds the annular surface 103 on the hub through the grinding surface 443.

[0049] Step S4: Gradually reduce the speed of the servo motor 11. Under the elastic force of the spring 21, the grinding part 4 moves towards the center of the working plate 2 and performs secondary grinding on the annular surface 103, annular surface 102, and annular surface 101 in sequence.

[0050] After reducing the speed of the servo motor 11, the centrifugal force on the grinding head 44 is reduced. The elastic force of the spring 21 drives the grinding part 4 to move in the opposite direction along the radial direction of the working disc 2, so that the grinding head 44 performs secondary grinding on the three annular surfaces 103, 102, and 101 of the wheel hub in sequence, thereby improving the grinding effect and making the surface of the wheel hub brighter.

[0051] Step S5: Stop the machine, lower the height of the worktable, and replace it with another wheel hub.

[0052] In summary, the grinding of the wheel hub end face is completed through the above steps. By controlling the servo motor 11 to accelerate and decelerate once, two grinding operations can be completed on different annular surfaces of the wheel hub. Furthermore, the grinding head 44 grinds different annular surfaces of the wheel hub from different positions, reducing the wear of the grinding head 44 and extending its service life.

[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A processing apparatus for automobile wheel hubs, characterized in that, Includes a frame (1) and a servo motor (11) mounted on the frame (1). The output end of the servo motor (11) is connected to a working disk (2). A slider (3) is slidably connected in the radial direction inside the working disk (2). A grinding part (4) is slidably arranged on the slider (3) in the vertical direction. A guide block (5) is installed inside the working disk (2). A guide surface (51) is provided at the bottom of the guide block (5). The top end of the grinding part (4) is slidably connected to the guide surface (51). A spring (21) is fixed at one end of the slider (3). The other end of the spring (21) is fixed to the working disk (2). The front of the wheel hub is provided with multiple reinforcing ribs, and the surfaces of the reinforcing ribs are located on the first ring surface (101), the second ring surface (102), and the third ring surface (103); the shape of the guide surface (51) corresponds to the longitudinal section shape of the combination of the first ring surface (101), the second ring surface (102), and the third ring surface (103); The grinding component (4) includes a sleeve (41) and a slide rod (42) slidably connected to the inner wall of the sleeve (41). The grinding component (4) is slidably connected to the slider (3) through the outer wall of the sleeve (41). A sliding seal is established between the sleeve (41) and the slide rod (42) through a sealing ring. A sealed air cavity (45) is formed between the inner wall of the sleeve (41) and the slide rod (42). The grinding component (4) also includes a grinding head (44) fixed to the bottom end of the slide bar (42), and the grinding head (44) is provided with multiple grinding surfaces corresponding to different annular surfaces on the hub; A balance block (24) is slidably connected in the radial direction inside the working disk (2). The balance block (24) and the slider (3) are located on the radial sides of the working disk (2). One end of the balance block (24) is fixed with a spring (26), and the other end of the spring (26) is fixed to the working disk (2).

2. The processing apparatus for automobile wheel hubs according to claim 1, characterized in that, The cross-section of the slide rod (42) is not circular, and the inner wall shape of the sleeve (41) corresponds to that of the slide rod (42).

3. The processing apparatus for automobile wheel hubs according to claim 1, characterized in that, The outer wall cross-section of the sleeve (41) is not circular, and the slider (3) has a sliding hole (31) corresponding to the shape of the outer wall of the sleeve (41).

4. The processing apparatus for automobile wheel hubs according to claim 1, characterized in that, The grinding component (4) also includes a magnet (43) fixed to the top of the sleeve (41), the top surface of the magnet (43) is an arc surface, and the guide block (5) is fixed with an iron piece (52) that attracts the magnet (43).

5. A method for processing an automobile wheel hub, using the automobile wheel hub processing apparatus according to claim 4, characterized in that, Includes the following steps: Step S1: Place the wheel hub on the worktable below the worktable (2), and raise the worktable to bring the wheel hub to the processing position; Step S2: Start the servo motor (11) to drive the work plate (2) to rotate, and the grinding part (4) rotates to complete the grinding of the ring surface (101); Step S3: Gradually increase the speed of the servo motor (11), and the grinding part (4) moves to the outside of the working plate (2) under the action of centrifugal force. The top of the grinding part (4) moves in contact with the guide surface (51) to complete the grinding of the second ring surface (102) and the third ring surface (103). Step S4: Gradually reduce the speed of the servo motor (11), and the grinding part (4) moves towards the center of the working plate (2) under the elastic force of the spring (21), and performs secondary grinding on the three ring surfaces (103), the two ring surfaces (102), and the one ring surface (101) in sequence. Step S5: Stop the machine, lower the height of the worktable, and replace it with another wheel hub.

6. The method for processing an automobile wheel hub according to claim 5, characterized in that, The guide block (5) is made of sintered clay. After the clay is formed but before it is cured, the iron sheet (52) is installed by insertion.

7. A method for processing an automobile wheel hub according to claim 5, characterized in that, The guide block (5) is generated by 3D printing, and a slot for inserting the iron sheet (52) is reserved during 3D printing.

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