A hub bearing machining device and a hub bearing machining process

Abstract

The application discloses a kind of hub bearing machining device and hub bearing machining process, belong to hub bearing machining technical field.It includes processing machine tool, with fixed grinding bar's processing spindle, and the clamping assembly with three-jaw chuck fixed on top.It also includes lifting assembly, the blowing assembly of sleeve set in chuck periphery and driving assembly;Blowing assembly is equipped with two groups of upper and lower rotary shafts with transmission gear and spray head;Driving assembly includes the driving rack with smooth section and toothed section.The application lifts blowing assembly by lifting assembly after workpiece unloading, utilizes driving rack linear displacement and cooperates with transmission gear, drives spray head to rotate and dynamically sprays high-pressure gas and flushing liquid towards chuck clamping surface.This structure effectively cleans the metal swarf stagnated by gravity in vertical machining, avoids the surface wear caused by metal swarf between chuck and workpiece in next cycle clamping precision attenuation and internal grinding.

Description

Technical Field

[0001] This invention relates to the field of wheel hub bearing processing technology, and in particular to a wheel hub bearing processing device and a wheel hub bearing processing technology. Background Technology

[0002] When performing precision grinding on the inner diameter of wheel hub bearings, a vertical machining structure is typically used. Currently, in the layout of this type of vertical machine tool, the machining spindle is usually arranged vertically above the machine tool, and the clamping device for fixing the workpiece is located on the rotary worktable below.

[0003] During machining, cutting fluid is sprayed from top to bottom to remove cutting heat and metal shavings. To achieve automated clamping, the bottom clamping device typically uses a three-jaw chuck. Its structure mainly includes a horizontal positioning reference surface to support the bottom end face of the wheel hub bearing, and guide rail grooves for the three clamping blocks to slide radially back and forth. During operation, the robot arm places the wheel hub bearing to be machined on the positioning reference surface, and each clamping block moves synchronously inward along the guide rail grooves to achieve centering and clamping of the outer circumference of the wheel hub bearing.

[0004] However, this solution based on downward flushing and chip removal, combined with a conventional three-jaw chuck at the bottom, has shortcomings. The reason for the decrease in clamping accuracy after continuous machining operations is that the vertical structure causes the waste fluid containing metal shavings to inevitably accumulate in the chuck area below due to gravity. Taking the long-cycle continuous operation of the machine tool as an example, when the machined wheel bearing is manually removed, some of the metal shavings mixed with the cutting fluid will flow and remain on the exposed clamping surface as the workpiece is removed. During the next loading operation, the metal shavings remaining on the clamping surface will be placed between the bearing end face and the chuck, causing surface wear on the workpiece during the inner cylindrical grinding after clamping. Summary of the Invention

[0005] The present invention provides a wheel hub bearing processing device and a wheel hub bearing processing technology to solve the problem that when unloading workpieces in continuous processing, waste liquid containing metal grinding chips flows onto the exposed clamping surface of the clamping block, causing subsequent workpieces to experience surface wear during grinding due to the pressure of grinding chips.

[0006] The present invention adopts the following technical solution: a wheel hub bearing processing device, including a machine tool; The clamping assembly is vertically slidable and rotatable inside the machine tool, and a three-jaw chuck for positioning and clamping the workpiece is coaxially fixed at its top. The machining spindle is fixed inside the machine tool and located above the clamping assembly, and has a fixed grinding rod for contact grinding of the inner hole of the workpiece; The lifting component is concealed and installed at the moving end of the clamping component; The purging assembly is sleeved around the three-jaw chuck via the lifting assembly. The purging assembly includes a mounting ring plate. The bottom surface of the mounting ring plate is rotatably mounted with two sets of upper and lower rotating shafts in a vertical direction. Each rotating shaft is fixed with a nozzle facing the clamping surface of the three-jaw chuck. One end of each rotating shaft is coaxially fixed with a transmission gear. The upper and lower sets of nozzles are respectively adapted to spray high-pressure gas and flushing liquid. The drive assembly, disposed on the mounting ring plate, includes a drive rack capable of vertical linear displacement. The drive rack consists of smooth sections at both ends and a toothed section in the middle. In the initial state, the smooth sections are located on the side of the transmission gear at the lower end. The lifting assembly is adapted to lift the purging assembly to a designated position after the workpiece is unloaded.

[0007] Furthermore, an air-blowing ring and a flushing ring are respectively suspended and fixed on the bottom surface of the mounting ring plate; The two sets of nozzles are respectively connected to the air blowing ring and the flushing ring via hoses. The hoses are flexible connecting pipes, which are suitable for providing clearance when the nozzles pitch and swing.

[0008] Furthermore, the bottom surface of the mounting ring plate is provided with three U-shaped frames arranged in a circular array. Each U-shaped frame has two concave blocks spaced apart along the vertical direction. The upper and lower sets of rotating shafts are respectively horizontally rotated and assembled inside the corresponding concave blocks. A return torsion spring is connected between the rotating shaft and the inner wall of the U-shaped frame. The return torsion spring is adapted to release energy when the toothed section disengages from the transmission gear, so that the nozzle corresponding to the pitch returns to its initial orientation.

[0009] Furthermore, the drive assembly also includes a miniature cylinder vertically fixed to the top surface of the mounting ring plate, and a slide rail plate vertically fixed to the bottom surface of the mounting ring plate; The drive rack is vertically connected to the telescopic end of the miniature cylinder and slides on the slide rail plate.

[0010] Furthermore, when the drive rack returns to its original position downwards with the micro cylinder, the smooth section at its bottom is adapted to avoid the transmission gear at the upper end. A protective cover is fixed to the bottom surface of the mounting ring plate, which encloses and shields the transmission gear, the drive rack, and their downward motion trajectory.

[0011] Furthermore, the clamping assembly includes a support column that is vertically fixed inside the machine tool, and a lifting slide is slidably mounted on the side of the support column in the vertical direction; The support column is equipped with a servo motor and a ball screw that is threadedly driven by the lifting slide. The servo motor drives the ball screw to rotate, thereby driving the lifting slide to rise and fall.

[0012] Furthermore, the lifting assembly is concealed inside the lifting slide and includes a vertically fixed lifting cylinder and a cantilever support fixed to the telescopic end of the lifting cylinder. The cantilever support extends laterally outward and is fixedly connected to the mounting ring plate. A guide rod is vertically fixed on the bottom surface of the cantilever support, and the guide rod slides downward along the axial direction through the outer shell of the lifting slide.

[0013] Furthermore, a spindle box is fixedly installed on the side wall of the lifting slide, and a rotating shaft is rotatably installed inside the spindle box. The three-jaw chuck is coaxially fixed to the top of the rotating shaft. A drive motor is fixed at the bottom of the spindle box, and the output end of the drive motor is connected to the rotating shaft for transmission.

[0014] Furthermore, the fixed grinding rod has a hollow internal structure, and the top end of the fixed grinding rod is connected to a spindle inlet pipe, which is adapted to introduce cutting fluid and penetrate the hollow structure of the fixed grinding rod.

[0015] Furthermore, the following steps are included: S1. Workpiece clamping and feeding: The workpiece to be processed is placed on the three-jaw chuck of the clamping assembly for positioning and clamping. The clamping assembly is driven to rotate and slide vertically, thereby causing the workpiece to rotate and be fed upward. S2, Internal Grinding: The fixed grinding rod of the machining spindle extends into the inner hole of the workpiece to perform contact grinding on the workpiece; S3. Workpiece unloading and cleaning lifting: After grinding is completed and the workpiece is unloaded, the lifting component is activated to lift the blowing component to the designated position. S4. Dynamic sequential sweeping cleaning: The drive rack moves upward, and its toothed section first engages with the lower transmission gear, driving the lower nozzle to produce a pitching motion to spray flushing fluid; then the toothed section disengages from the lower transmission gear and engages with the upper transmission gear, driving the upper nozzle to produce a pitching motion to spray high-pressure gas for air blowing. S5. Mechanism Reset and Cycle: After the clamping surface is cleaned, the drive rack and the lifting assembly are reset, and the blowing assembly falls downward to avoid the impact, preparing to enter the next round of processing.

[0016] The technical solutions adopted in the embodiments of the present invention can achieve the following beneficial effects: This invention discloses a wheel hub bearing processing device and process. The invention utilizes a hidden lifting component installed at the moving end of the clamping assembly. After processing and workpiece unloading, the blowing assembly, fitted around the three-jaw chuck, is lifted to a designated position. A drive assembly then drives a drive rack to perform vertical linear displacement, causing the smooth section at the toothed end of the drive rack to mesh with the transmission gear. This, in turn, drives the upper and lower rotating shafts and the nozzles fixed thereon to rotate, dynamically spraying high-pressure gas and flushing fluid towards the clamping surface of the three-jaw chuck. This structure utilizes mechanical transmission to achieve sweeping cleaning of the clamping surface, effectively removing metal shavings that accumulate and deposit in the chuck area under gravity in vertical grinding structures. This avoids the problem of residual waste fluid and shavings padding between the bearing end face and the chuck during long-cycle continuous machining operations and the next loading cycle, thus ensuring the positioning and clamping accuracy of the three-jaw chuck and preventing workpiece surface wear caused by clamping reference attenuation during internal grinding. Attached Figure Description

[0017] The accompanying drawings, which are provided to further illustrate the invention and form part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0018] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of the wheel hub bearing processing device in this application; Figure 2 For the present invention Figure 1 A schematic diagram of a partial structure; Figure 3 This is an enlarged structural diagram of point A in part 3 of the present invention; Figure 4 For the present invention Figure 1 Schematic diagram of the clamping assembly structure; Figure 5 For the present invention Figure 4 Enlarged structural diagram at point B; Figure 6 For the present invention Figure 5 Enlarged structural diagram at point C; Figure 7 For the present invention Figure 4 A schematic diagram of a partial structure; Figure 8 For the present invention Figure 4 A schematic diagram of the bottom view structure; Figure 9 For the present invention Figure 8 A schematic diagram of a partial structure; Figure 10 For the present invention Figure 9 Enlarged structural diagram at point D.

[0019] Figure label: 1. Machine tool; 2. Clamping assembly; 21. Support column; 22. Lifting slide; 23. Telescopic dust cover; 24. Spindle box; 25. Rotary axis; 26. Three-jaw chuck; 27. Drive motor; 28. Ball screw; 29. ​​Servo motor; 3. Machining spindle; 31. Spindle bracket; 32. Adjusting block; 33. Adjusting knob; 34. Support rod; 35. Mounting panel; 36. Fixed grinding rod; 37. Spindle inlet pipe; 4. Blowing... 41. Sweeping assembly; 42. Mounting ring plate; 43. Air blowing ring; 44. Flushing ring; 45. U-shaped frame; 46. Concave block; 47. Rotating shaft; 48. Nozzle; 5. Hose; 6. Drive assembly; 51. Miniature cylinder; 52. Slide rail plate; 53. Drive rack; 531. Smooth section; 532. Toothed section; 54. Transmission gear; 55. Protective cover; 6. Lifting assembly; 61. Lifting cylinder; 62. Cantilever support; 63. Guide rod. Detailed Implementation

[0020] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0021] The technical solutions provided by the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] Example 1: This example mainly introduces the basic structure and working principle of the wheel hub bearing processing device, specifically: like Figures 1-2 , Figure 4 and Figure 7 As shown, this application provides a wheel hub bearing processing device, including a processing machine tool 1, with two clamping assemblies 2 arranged in parallel inside the processing machine tool 1. The clamping assemblies 2 are suitable for alternating feeding operations and are used to position and clamp the wheel hub bearing and drive it to feed upward.

[0023] Specifically, the clamping assembly 2 includes a support column 21 vertically fixed to the inner wall of the machine tool 1, a servo motor 29 fixed inside the support column 21, a ball screw 28 rotatably supported inside the support column 21, the output end of the servo motor 29 being connected to the ball screw 28 for driving the ball screw 28 to rotate, and a lifting slide 22 slidably mounted on the side of the support column 21 in the vertical direction, the lifting slide 22 being threadedly engaged with the ball screw 28.

[0024] Telescopic dust covers 23 are connected between the upper and lower ends of the lifting slide 22 and the supporting column 21, respectively. A spindle box 24 is fixedly installed on the side wall of the lifting slide 22. A rotating shaft 25 is rotatably installed inside the spindle box 24 through bearings. A drive motor 27 is fixed at the bottom of the spindle box 24. The output end of the drive motor 27 is connected to the rotating shaft 25 for transmission. A three-jaw chuck 26 is coaxially fixed at the top of the rotating shaft 25. Three clamping blocks with clamping surfaces are arranged in a circular array on the three-jaw chuck 26.

[0025] It should be noted that during the operation of the aforementioned clamping component 2: First, the wheel hub bearing to be processed is placed on the three-jaw chuck 26 through alternating feeding operations. The three clamping blocks on the three-jaw chuck 26 move radially synchronously, thereby positioning and clamping the wheel hub bearing.

[0026] Subsequently, the servo motor 29 starts and drives the ball screw 28 to rotate. Due to the threaded transmission between the lifting slide 22 and the ball screw 28, the rotation of the ball screw 28 is converted into a linear feed motion of the lifting slide 22 vertically upward along the support column 21. During this displacement process, the telescopic dust covers 23 connected to the upper and lower ends of the lifting slide 22 undergo synchronous tensile and compressive deformation, protecting the transmission components inside the support column 21.

[0027] The upward movement of the lifting slide 22 drives the spindle box 24, the rotating shaft 25 and the three-jaw chuck 26 to feed upward as a whole, so that the clamped workpiece reaches the specified processing height; at the same time, the drive motor 27 starts, and its output end drives the rotating shaft 25 to rotate at high speed inside the spindle box 24, thereby driving the three-jaw chuck 26 at the top and the wheel hub bearing to rotate synchronously.

[0028] Reference Figures 2-3 As shown, a machining spindle 3 is further provided inside the machining tool 1. Specifically, the machining spindle 3 includes a spindle support 31 fixed to the inner wall of the machining tool 1. An adjusting block 32 is fixed to one end of the spindle support 31. A support rod 34 is vertically movably inserted through the adjusting block 32. An adjusting knob 33 is threadedly connected to the support rod 34 to achieve locking.

[0029] A mounting panel 35 is fixed to the bottom end of the support rod 34, and a fixed grinding rod 36 is fixed on the mounting panel 35. The fixed grinding rod 36 is used for contact friction with the inner circle of the workpiece, and its interior has a hollow structure. A spindle fluid inlet pipe 37 is connected to the top end of the fixed grinding rod 36. The spindle fluid inlet pipe 37 is used to introduce cutting fluid and pass through the hollow structure of the fixed grinding rod 36. In the working state, the clamping assembly 2 moves the workpiece upward to contact the fixed grinding rod 36, and the cutting fluid achieves cooling and chip removal from the inner hole from top to bottom through the hollow structure.

[0030] When the clamping assembly 2 holds the workpiece and drives it to rotate at high speed and feed upward in a straight line, the fixed grinding rod 36 located above extends into the inner hole of the workpiece to perform contact grinding on its inner surface.

[0031] While the aforementioned contact grinding action continues, external cutting fluid is introduced into the hollow structure of the fixed grinding rod 36 through the spindle inlet pipe 37, and flows out from the bottom end of the fixed grinding rod 36 to the grinding contact area. Utilizing this continuous coordinated action, real-time cooling of the grinding area is achieved, and the downward flow of the cutting fluid flushes away the metal chips generated during cutting, thus completing the continuous internal grinding and cooling chip removal operation.

[0032] It should be noted that a cutting fluid pipe is installed inside the machine tool 1 at the position corresponding to the machining spindle 3. Specifically, the cutting fluid pipe is fixed to the inner wall of the machine tool 1, and its nozzle end is oriented towards the workpiece held by the top of the clamping assembly 2.

[0033] During the aforementioned machining operation, when the fixed grinding rod 36 performs internal grinding on the workpiece, the cutting fluid pipe simultaneously and continuously sprays cutting fluid into the external machining area of ​​the workpiece to achieve external cooling and flushing. In the continuous external spraying and internal cooling process, due to the vertical machine tool structure, the cutting fluid sprayed from the cutting fluid pipe mixes with the waste fluid discharged from the spindle inlet pipe 37, along with metal shavings, and flows downwards under gravity.

[0034] Example 2: In the aforementioned vertical machining layout, the cutting fluid containing metal shavings flows downwards under gravity and collects on the clamping surface of the three-jaw chuck 26, affecting the subsequent internal grinding of the workpiece. (Refer to...) Figures 5-8 As shown, a lifting assembly 6 is concealed inside the lifting slide 22. Specifically, the lifting assembly 6 includes a lifting cylinder 61 vertically fixed inside the lifting slide 22, a cantilever support 62 fixed at the telescopic end of the lifting cylinder 61, the cantilever support 62 extending laterally outward; and a guide rod 63 vertically fixed on the bottom surface of the cantilever support 62, the guide rod 63 sliding downward along the axial direction through the outer shell of the lifting slide 22.

[0035] Continue to refer to Figures 5-8 As shown, a purge assembly 4 is coaxially sleeved in a ring around the periphery of the three-jaw chuck 26, and the purge assembly 4 is fixedly connected to the end of the cantilever support 62 of the lifting assembly 6 that extends laterally outward.

[0036] Specifically, the purging assembly 4 includes a mounting ring plate 41 arranged horizontally and coaxially sleeved on the outside of the three-jaw chuck 26. A pneumatic ring 42 is suspended and fixed on the bottom surface of the mounting ring plate 41 by a connecting rod. A flushing ring 43 is suspended and fixed on the bottom surface of the mounting ring plate 41, and the flushing ring 43 is parallel to and located directly below the pneumatic ring 42. Furthermore, the air inlet end of the pneumatic ring 42 is connected to an external high-pressure air source pipeline, and the liquid inlet end of the flushing ring 43 is connected to an external flushing liquid supply device to provide high-pressure gas and flushing liquid respectively.

[0037] Three U-shaped frames 44 are arranged in a 120-degree circular array along the bottom surface of the mounting ring plate 41, with the open end of each U-shaped frame 44 facing the clamping block corresponding to the three-jaw chuck 26. Two concave blocks 45 are arranged vertically spaced inside each U-shaped frame 44, with the two concave blocks 45 at the same horizontal height as the air blowing ring 42 and the flushing ring 43, respectively. A rotating shaft 46 is horizontally rotatably mounted inside each concave block 45, and a return torsion spring (not shown in the figure) is connected between the rotating shaft 46 and the inner wall of the U-shaped frame 44. A nozzle 47 is fixed on each rotating shaft 46, and each nozzle 47 is oriented toward the corresponding clamping block. The upper and lower sets of nozzles 47 are connected to the air blowing ring 42 and the flushing ring 43 respectively through a hose 48. The hose 48 is a flexible connecting pipe connecting the nozzle 47 and the corresponding fluid ring pipe. The upper nozzle 47 is suitable for spraying high-pressure gas, and the lower nozzle 47 is suitable for spraying flushing liquid. In the initial state, under the elastic force of the return torsion spring, the nozzles 47 on the rotating shaft 46 maintain the specified orientation position.

[0038] In the initial state, during normal grinding operations on the workpiece by the machining spindle 3 and during workpiece loading and unloading, the lifting assembly 6 is in its initial reset state. Specifically, the telescopic end of the lifting cylinder 61 is in the retracted and lowered position, causing the cantilever support 62 and the blowing assembly 4 suspended by the mounting ring plate 41 to be positioned below the clamping surface of the three-jaw chuck 26. This ensures that the blowing assembly 4 can completely avoid interference with the normal clamping and grinding feed space of the wheel hub bearing during non-cleaning periods.

[0039] After the processing is completed and the workpiece is removed from the three-jaw chuck 26, the lifting cylinder 61 is activated, and its telescopic end pushes upward, driving the cantilever support 62 and the entire blowing assembly 4 to rise vertically in sync. During this upward displacement, the guide rod 63 slides along the inner wall of the outer shell of the lifting slide 22. When the blowing assembly 4 is lifted to the cleaning station, the upper and lower sets of nozzles 47 in each U-shaped frame 44 distributed in a circumferential array are directly aligned with the three clamping blocks and clamping surfaces on the three-jaw chuck 26.

[0040] At this time, the external flushing fluid and high-pressure gas are respectively introduced into the flushing ring 43 and the air blowing ring 42, and are guided to the corresponding lower nozzle 47 and upper nozzle 47 through the hose 48. The flushing fluid sprayed from the lower nozzle 47 is used to rinse the metal shavings and residual waste liquid attached to the clamping surface, while the high-pressure gas sprayed from the upper nozzle 47 is used to blow away water and clean the flushed surface, thereby realizing the fixed-point cleaning operation of the clamping surface.

[0041] Reference Figures 9-10 As shown, in order to achieve sequential swing drive of the upper and lower sets of nozzles 47 that connect the flushing ring 43 and the air blowing ring 42 respectively, and to further improve the cleaning effect, drive components 5 are arranged in a circumferential array on the mounting ring plate 41, and the number of drive components 5 corresponds one-to-one with the U-shaped frame 44. Specifically, the drive component 5 includes a miniature cylinder 51 vertically fixed to the top surface of the mounting ring plate 41, whose telescopic end extends downward corresponding to the position of the U-shaped frame 44, and a slide rail plate 52 is vertically fixed to the bottom surface of the mounting ring plate 41. A drive rack 53 is vertically connected to the telescopic end of the miniature cylinder 51, and the drive rack 53 slides on the slide rail plate 52.

[0042] The drive rack 53 consists of smooth sections 531 at both ends and a toothed section 532 in the middle. A transmission gear 54 is coaxially fixed at one end of each rotating shaft 46. The transmission gear 54 is adapted to mesh with the toothed section 532 of the drive rack 53. In the initial state, the smooth section 531 at the top of the drive rack 53 is located on the side of the lower transmission gear 54. A protective cover 55 is fixed on the side wall of the U-shaped frame 44. The protective cover 55 encloses and shields the transmission gear 54, the drive rack 53 and their downward motion trajectory.

[0043] It should be noted that after the workpiece is unloaded after processing, the device enters the cleaning process. The lifting cylinder 61 drives the cantilever support 62 and the mounting ring plate 41 to rise as a whole, reaching the designated cleaning position of the three-jaw chuck 26. Subsequently, the micro cylinder 51 retracts upward, pulling the drive rack 53 to slide upward along the slide rail plate 52. Since the smooth section 531 at the top of the drive rack 53 is located on the side of the lower transmission gear 54 in the initial state, as the drive rack 53 moves upward, its toothed section 532 first contacts and meshes with the lower transmission gear 54, driving the lower rotating shaft 46 to rotate, causing the lower nozzle 47 connected to the flushing ring 43 to pitch downward, performing a top-down flushing operation on the clamping surface of the clamping block.

[0044] As the drive rack 53 continues to move upward, the toothed segment 532 disengages from the lower transmission gear 54, and the lower transmission gear 54 contacts the lower smooth segment 531 and stops rotating. The lower nozzle 47 resets and stops pitching. Simultaneously, the toothed segment 532 moves upward to the position of the upper transmission gear 54 and meshes with it, driving the upper rotating shaft 46 to rotate. This causes the upper nozzle 47, which is connected to the air blowing ring 42, to pitch downward, performing high-pressure gas sweeping and drying on the rinsed clamping surface from top to bottom. By utilizing the upward movement of the drive rack 53 and the sequential meshing of the upper and lower transmission gears 54, this mechanism achieves the sequential oscillation of the two sets of nozzles 47 from top to bottom, achieving the timing control of water washing followed by air blowing.

[0045] In summary, the wheel hub bearing processing device proposed in this application achieves a high-efficiency processing and self-cleaning closed-loop operation through the cooperation of a vertical processing structure and an automated cleaning mechanism. After grinding is completed and the workpiece is unloaded, the lifting component 6 is activated, raising the blowing component 4, which was originally in a downward avoidance state, to the cleaning position of the three-jaw chuck 26. Subsequently, the drive component 5 uses a micro cylinder 51 to pull the drive rack 53 with specific tooth segments upward. Through the arrangement of the smooth segment 531 and the toothed segment 532, it sequentially meshes with the upper and lower transmission gears 54, transforming the single linear stretching motion into the sequential pitching and oscillating of the lower flushing nozzle 47 and the upper air blowing nozzle 47. This effectively eliminates the surface residue of waste liquid and metal shavings, and effectively ensures the clamping reference accuracy of the three-jaw chuck 26 during continuous alternating loading operations of the processing machine tool 1.

[0046] Example 3: Based on the wheel hub bearing processing apparatus in Examples 1 and 2, this example provides a wheel hub bearing processing technology. Its core lies in organically combining processing feed, gravity-driven chip removal, and automated sequential cleaning actions. This technology specifically includes the following steps: S1. Workpiece clamping and feeding The wheel hub bearing to be processed is placed on the three-jaw chuck 26 of the clamping assembly 2. The clamping blocks are controlled to move radially synchronously to complete the positioning and clamping of the wheel hub bearing. The servo motor 29 inside the support column 21 is started to drive the ball screw 28 to rotate, which drives the lifting slide 22 and the spindle box 24 to move upward. At the same time, the drive motor 27 drives the three-jaw chuck 26 and the workpiece to rotate at high speed, so that the wheel hub bearing is fed upward in a linear motion to the specified processing height.

[0047] S2, Internal Grinding and Gravity Chip Removal As the workpiece is fed upward, the fixed grinding rod 36 on the machining spindle 3 makes contact grinding relative to the inner hole of the wheel hub bearing. During the grinding operation, the external cutting fluid pipe sprays cutting fluid into the machining area around the workpiece, while the spindle inlet pipe 37 guides the cutting fluid into the hollow structure of the fixed grinding rod 36 and out from its bottom end. The metal shavings are washed away by gravity by the vertical machine tool frame and cooled by the dual internal and external cooling.

[0048] S3. Workpiece unloading and cleaning lifting After the grinding process is completed, the clamping assembly 2 stops rotating and descends back to unload the processed workpiece from the three-jaw chuck 26. Then, the lifting cylinder 61 of the lifting assembly 6 is activated, and its telescopic end extends to lift the blowing assembly 4, which is in a avoidance state below the three-jaw chuck 26, vertically to the cleaning station, so that the nozzles 47 distributed in a circular array are aligned with the clamping blocks and clamping surfaces on the three-jaw chuck 26.

[0049] S4, Dynamic Timing Sweep Cleanup The flushing fluid and high-pressure gas are respectively introduced into the flushing ring 43 and the air blowing ring 42. The miniature cylinder 51 of the drive assembly 5 retracts, pulling the drive rack 53 upward along the slide rail 52. Liquid washing for dandruff removal: The toothed section 532 of the drive rack 53 first meshes with the lower transmission gear 54, driving the lower rotating shaft 46 to rotate, causing the lower flushing nozzle 47 to produce a pitching motion from top to bottom, dynamically flushing the clamping surface with liquid.

[0050] Air blowing for water removal: The drive rack 53 continues to move upward, and the toothed segment 532 disengages from the lower drive gear 54 and meshes with the upper drive gear 54, driving the upper air blowing nozzle 47 to produce a pitching motion from top to bottom, dynamically blowing dry the rinsed clamping surface with high-pressure air. Through the above mechanical transmission sequence, the fixed-point cleaning operation of first liquid washing and then air blowing is completed.

[0051] S5, Mechanism Reset and Cyclic After the clamping surface is cleaned, the micro cylinder 51 extends and resets, driving the rack 53 downward. Under the elastic force of the internal reset torsion spring, each rotating shaft 46 drives the nozzle 47 to return to the initially set horizontal orientation position. The lifting cylinder 61 retracts, driving the blowing assembly 4 to fall back to the avoidance position. The processing machine tool 1 returns to the initial state, ready to enter the next round of hub bearing loading and cycle processing.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A wheel hub bearing processing device, characterized in that, include: Machine tool (1); The clamping assembly (2) is vertically slidable and rotatable inside the machine tool (1), and a three-jaw chuck (26) for positioning and clamping the workpiece is coaxially fixed on its top. The machining spindle (3) is fixed inside the machining machine tool (1) and located above the clamping assembly (2), and has a fixed grinding rod (36) for contact grinding of the inner hole of the workpiece. The lifting assembly (6) is concealed and installed at the moving end of the clamping assembly (2); The purging assembly (4) is sleeved around the three-jaw chuck (26) via the lifting assembly (6). The purging assembly (4) includes a mounting ring plate (41). The bottom surface of the mounting ring plate (41) is rotatably mounted with two sets of upper and lower rotating shafts (46) in the vertical direction. Each rotating shaft (46) is fixed with a nozzle (47) facing the clamping surface of the three-jaw chuck (26). One end of each rotating shaft (46) is coaxially fixed with a transmission gear (54). The upper and lower sets of nozzles (47) are respectively suitable for spraying high-pressure gas and flushing liquid. The drive assembly (5) is disposed on the mounting ring plate (41) and includes a drive rack (53) capable of vertical linear displacement. The drive rack (53) is composed of smooth sections (531) at both ends and a toothed section (532) in the middle. In the initial state, the smooth sections (531) are located on the side of the transmission gear (54) at the lower end. The lifting assembly (6) is adapted to lift the purging assembly (4) to a designated position after the workpiece is unloaded.

2. The wheel hub bearing processing device according to claim 1, characterized in that: The bottom surface of the mounting ring plate (41) is respectively suspended and fixed with an air blowing ring (42) and a flushing ring (43). The two sets of nozzles (47) are respectively connected to the air blowing ring (42) and the flushing ring (43) via hoses (48). The hoses (48) are flexible connecting pipes, which are suitable for providing clearance when the nozzles (47) pitch and swing.

3. The wheel hub bearing processing device according to claim 2, characterized in that: The bottom surface of the mounting ring plate (41) is provided with three U-shaped frames (44) arranged in a circular array. Each U-shaped frame (44) has two concave blocks (45) spaced apart in the vertical direction. The upper and lower sets of rotating shafts (46) are respectively horizontally rotated and assembled inside the corresponding concave blocks (45). A reset torsion spring is connected between the rotating shaft (46) and the inner wall of the U-shaped frame (44). The reset torsion spring is adapted to release energy when the toothed section (532) disengages from the transmission gear (54), so that the nozzle (47) corresponding to the pitch returns to its initial orientation.

4. The wheel hub bearing processing device according to claim 1, characterized in that: The drive assembly (5) also includes a miniature cylinder (51) vertically fixed to the top surface of the mounting ring plate (41), and a slide rail plate (52) vertically fixed to the bottom surface of the mounting ring plate (41). The drive rack (53) is vertically connected to the telescopic end of the micro cylinder (51) and slides on the slide rail plate (52).

5. The wheel hub bearing processing device according to claim 4, characterized in that: When the drive rack (53) returns to its original position as the micro cylinder (51) moves downwards, the smooth section (531) at its bottom is adapted to avoid the transmission gear (54) at its upper end. The bottom surface of the mounting ring plate (41) is fixed with a protective cover (55), which encloses and shields the transmission gear (54), the drive rack (53) and their downward motion trajectory.

6. The wheel hub bearing processing device according to claim 1, characterized in that: The clamping assembly (2) includes a support column (21) that is vertically fixed inside the machine tool (1), and a lifting slide (22) is slidably mounted on the side of the support column (21) in the vertical direction. The support column (21) is equipped with a servo motor (29) and a ball screw (28) that is threadedly driven to the lifting slide (22). The servo motor (29) drives the ball screw (28) to rotate so as to lift the lifting slide (22) up and down.

7. The wheel hub bearing processing device according to claim 6, characterized in that: The lifting assembly (6) is concealed inside the lifting slide (22), including a vertically fixed lifting cylinder (61) and a cantilever support (62) fixed on the telescopic end of the lifting cylinder (61). The cantilever support (62) extends laterally outward and is fixedly connected to the mounting ring plate (41). A guide rod (63) is vertically fixed on the bottom surface of the cantilever support (62). The guide rod (63) slides downward along the axial direction through the outer shell of the lifting slide (22).

8. The wheel hub bearing processing device according to claim 6, characterized in that: A spindle box (24) is fixedly installed on the side wall of the lifting slide (22), and a rotating shaft (25) is rotatably installed inside the spindle box (24). The three-jaw chuck (26) is coaxially fixed to the top of the rotating shaft (25). The bottom end of the spindle box (24) is fixed with a drive motor (27), and the output end of the drive motor (27) is connected to the rotating shaft (25) for transmission.

9. The wheel hub bearing processing device according to claim 1, characterized in that: The fixed grinding rod (36) has a hollow interior structure. The top end of the fixed grinding rod (36) is connected to a spindle inlet pipe (37). The spindle inlet pipe (37) is adapted to introduce cutting fluid and penetrate the hollow structure of the fixed grinding rod (36).

10. A wheel hub bearing processing technology, characterized in that, The wheel hub bearing processing device described in claim 1 is used to achieve this, comprising the following steps: S1. Workpiece clamping and feeding: The workpiece to be processed is placed on the three-jaw chuck (26) of the clamping assembly (2) for positioning and clamping. The clamping assembly (2) is driven to rotate and slide vertically, thereby rotating the workpiece and feeding it upward. S2, Internal grinding: The fixed grinding rod (36) of the machining spindle (3) extends into the inner hole of the workpiece to perform contact grinding on the workpiece; S3. Workpiece unloading and cleaning lifting: After grinding is completed and the workpiece is unloaded, the lifting assembly (6) is started to lift the blowing assembly (4) to the designated position. S4. Dynamic sequential sweeping cleaning: The drive rack (53) moves upward, and its toothed segment (532) first meshes with the lower transmission gear (54), driving the lower nozzle (47) to produce a pitching motion to spray flushing fluid for rinsing; then the toothed segment (532) disengages from the lower transmission gear (54) and meshes with the upper transmission gear (54), driving the upper nozzle (47) to produce a pitching motion to spray high-pressure gas for air blowing. S5. Mechanism Reset and Cycle: After the clamping surface is cleaned, the drive rack (53) and the lifting assembly (6) are reset, and the blowing assembly (4) falls back down to avoid the impact, preparing to enter the next round of processing.

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