A polishing device for automobile parts machining

Abstract

The application relates to the technical field of polishing devices, and discloses a polishing device for automobile part machining, which comprises a polishing table; at least two polishing units, each polishing unit comprising a sliding frame and a loading frame connected to the sliding frame through a displacement assembly, and a polishing wheel being installed on the loading frame; a correction unit, the correction unit comprising a first roller in elastic floating contact with the outer circumferential surface of a polishing piece and a displacement sensor for detecting the radial displacement amount of the first roller, and the correction unit applying a radial extrusion force to the outer circumferential deformation position of the polishing piece according to the feedback of the displacement sensor to actively correct the bending deformation of the polishing piece during polishing. According to the application, the two polishing units are symmetrically arranged on the two sides of the workpiece, the polishing wheels simultaneously polish the workpiece from opposite directions, most of the polishing forces are self-canceled, and thus the driving force of the bending deformation of the workpiece is greatly reduced at the polishing principle level.

Description

Technical Field

[0001] This invention relates to the field of polishing equipment technology, and more specifically, to a polishing equipment for processing automotive parts. Background Technology

[0002] In automotive parts manufacturing, many cylindrical parts (such as drive shafts, exhaust pipes, and hollow shock absorber sleeves) require grinding or belt abrasion of their outer cylindrical surfaces to achieve the required cylindricity, roundness, and surface roughness. This is especially true for slender shaft parts, which have a large length-to-diameter ratio and weak radial stiffness. During grinding, they are prone to elastic bending deformation due to unidirectional grinding forces, resulting in a bulging or tapered outer cylindrical shape and severely out-of-tolerance cylindricity, directly affecting the assembly accuracy and performance of the parts.

[0003] Currently, traditional cylindrical grinding machines or belt grinders typically use a single grinding wheel for radial feed to grind workpieces. Since the grinding force is applied only from one side of the workpiece, the slender workpiece undergoes elastic bending under the radial force, and the bending amount is unevenly distributed along the axial direction. The deflection is greatest in the middle and smaller at both ends due to the support of the center. This results in the workpiece having a larger diameter in the middle and a smaller diameter at both ends after grinding, forming a waist-shaped profile, which seriously affects product quality.

[0004] While adding a fixed center support in the middle of the workpiece can suppress deflection, this fixed support requires manual adjustment of the radial position and locking force of the support claws after the machine is stopped. This adjustment process is cumbersome and highly dependent on the operator's experience. When changing to workpieces of different diameters or as the grinding wheel wears down, the original support settings become unsuitable and need to be readjusted, severely restricting production efficiency. More importantly, a fixed center support can only reduce deflection to a certain extent, but it cannot completely eliminate bending deformation, nor can it actively correct existing deformation. Summary of the Invention

[0005] This invention provides a grinding device for processing automotive parts, which solves the technical problem in related technologies where the grinding force is applied only from one side of the workpiece, causing the slender workpiece to elastically bend under the action of radial force, forming a drum-shaped profile, which seriously affects product quality.

[0006] This invention provides a grinding device for processing automotive parts, used for grinding the outer surface of the workpiece, comprising: A polishing table, wherein a polishing area is provided on the polishing table; At least two sets of grinding units are symmetrically arranged on both sides of the grinding area; each set of grinding units includes a sliding frame and a loading frame connected to the sliding frame via a displacement component. A grinding wheel is mounted on the loading frame, and the displacement component can drive the loading frame to move independently relative to the sliding frame along the radial direction of the grinding workpiece to adjust the radial feed of the grinding wheel. A correction unit is installed on at least one set of the grinding units. The correction unit includes a first roller that contacts the outer peripheral surface of the grinding part in an elastically floating manner and a displacement sensor for detecting the radial displacement of the first roller. The correction unit applies radial extrusion force to the outer peripheral deformation position of the grinding part according to the feedback of the displacement sensor, so as to actively correct the bending deformation of the grinding part during the grinding process.

[0007] As a further optimization of the present invention, the grinding wheel is provided with a protective cover, the protective cover including a back plate and a cover plate that are connected to each other.

[0008] As a further optimization of the present invention, the displacement component includes a second motor fixed to the loading frame and a first threaded rod rotatably connected to the loading frame. A first threaded sleeve is threadedly connected to the first threaded rod, and the first threaded sleeve is fixedly connected to the sliding frame. The output shaft of the second motor is connected to the first threaded rod through a second belt pulley transmission mechanism, so as to drive the loading frame to move radially relative to the sliding frame along the grinding workpiece by the rotation of the first threaded rod.

[0009] As a further optimization of the present invention, the correction unit further includes a first hydraulic cylinder mounted on the cover plate of the protective cover. The telescopic end of the first hydraulic cylinder is fixed with a connecting frame. A sleeve is provided on the connecting frame. A sliding shaft is slidably connected inside the sleeve. The first roller is rotatably connected to the end of the sliding shaft near the grinding part through a bearing. A fixing frame is installed at the end of the sleeve away from the first roller. The displacement sensor is fixed on the fixing frame.

[0010] As a further optimization of the present invention, the detection end of the displacement sensor is in contact with the sliding shaft, so as to characterize the contact state between the first roller and the grinding workpiece and the radial deformation of the grinding workpiece by the axial displacement of the sliding shaft.

[0011] As a further optimization of the present invention, a sliding protrusion and a spring are provided on the outside of the sliding shaft. The sliding protrusion is fixed on the sliding shaft, and the two ends of the spring abut against the end of the sleeve and the sliding protrusion, respectively, so that the first roller is elastically attached to the surface of the grinding part with a constant preload in the non-correction state.

[0012] As a further optimization of the present invention, a second hydraulic cylinder is also installed on the cover plate of the protective cover, and the extension and retraction end of the second hydraulic cylinder is rotatably connected to a second roller through a bearing.

[0013] As a further optimization of the present invention, the extension and retraction directions of the sliding shaft and the second hydraulic cylinder are both arranged radially along the grinding workpiece, and the axes of both point to the center of the grinding workpiece, so as to apply a balanced radial support or corrective force to the grinding workpiece from the same radial direction.

[0014] As a further optimization of the present invention, a movable unit disposed between the grinding table and the sliding frame is also included, for driving the grinding unit to reciprocate along the axial direction of the grinding workpiece, so that the grinding wheel covers the axial processing range of the grinding workpiece.

[0015] As a further optimization of the present invention, it also includes clamping units disposed at both ends of the grinding area for coaxially clamping the grinding workpiece and driving the grinding workpiece to rotate. The clamping unit includes a first clamping component and a second clamping component disposed at both ends of the grinding area. The first clamping component is provided with a chuck for actively clamping and driving one end of the grinding workpiece to rotate, and the second clamping component is provided with a conical centering block for centering and clamping the other end of the grinding workpiece.

[0016] The beneficial effects of this invention are as follows: By symmetrically arranging two sets of grinding units on both sides of the workpiece, the grinding wheels simultaneously grind the workpiece from opposite directions, resulting in radial grinding forces on both sides that are opposite in direction and controllable in magnitude. By adjusting the radial feed of the two sets of grinding units to make the grinding forces on both sides essentially equal, most of the grinding forces can be self-cancelled, making the net radial force acting on the workpiece approach zero, thereby significantly reducing the driving force for workpiece bending deformation at the grinding principle level.

[0017] Furthermore, through the real-time deformation sensing link consisting of the first roller, sliding shaft, spring, and displacement sensor, the radial deformation of the workpiece at any angle during rotation can be captured instantly and converted into an electrical signal. The controller drives the second hydraulic cylinder to perform the correction action according to the deformation signal, while the first roller continuously provides feedback on the deformation recovery. The entire correction process is completed online under the condition that the workpiece rotation and grinding are carried out simultaneously, without stopping the machine. This ensures that each workpiece can be continuously corrected to the target cylindricity during the processing, and the consistency and yield rate during mass production are reliably guaranteed. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a partial three-dimensional structural schematic diagram of the present invention; Figure 3 This is a three-dimensional structural diagram of the clamping unit of the present invention; Figure 4 This is a three-dimensional structural diagram of the polishing unit of the present invention; Figure 5 This is a cross-sectional perspective view of the grinding unit of the present invention. Figure 6 This is a schematic diagram showing the positional relationship between the grinding wheel and the straightening unit and the grinding part of the present invention; Figure 7 This is a three-dimensional structural diagram of the correction unit of the present invention; Figure 8 This is a partial cross-sectional three-dimensional structural schematic diagram of the correction unit of the present invention.

[0019] In the diagram: 100, grinding table; 200, grinding unit; 210, sliding frame; 220, loading frame; 230, first motor; 240, connecting shaft; 250, first belt pulley transmission mechanism; 260, grinding wheel; 270, protective cover; 280, second motor; 290, first threaded rod; 2100, first threaded sleeve; 2110, second belt pulley transmission mechanism; 300, grinding part; 400, straightening unit; 410, first hydraulic cylinder; 420, connecting frame; 430, sleeve; 440, Sliding shaft; 450, First roller; 460, Fixed frame; 470, Displacement sensor; 480, Spring; 490, Second hydraulic cylinder; 4100, Second roller; 500, Moving unit; 510, Second threaded rod; 520, Second threaded sleeve; 530, Third motor; 540, Guide rail; 550, Guide sleeve; 600, Clamping unit; 610, First clamping assembly; 620, Clamping plate; 630, Second clamping assembly; 640, Conical centering clamp; 650, Bearing platform. Detailed Implementation

[0020] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0021] According to the appendix Figure 1 and attached Figure 2As shown in the figure, this embodiment provides a grinding apparatus for processing automotive parts, used to grind the outer surface of a grinding part 300. The grinding part 300 is typically a slender cylindrical part, such as an automotive drive shaft, exhaust pipe, shock absorber reservoir, or steering shaft. The apparatus mainly includes a grinding table 100, a grinding unit 200, a straightening unit 400, a moving unit 500, and a clamping unit 600.

[0022] The upper surface of the grinding table 100 is provided with a grinding area, which extends along the length of the grinding table 100 and is used to accommodate the grinding parts 300 and provide installation space for each unit.

[0023] According to the appendix Figure 2 Appendix Figure 4 To be continued Figure 6 As shown, at least two sets of grinding units 200 are symmetrically arranged on both sides of the grinding area. Each set of grinding units 200 includes a sliding frame 210, a displacement assembly, a loading frame 220, and a grinding wheel 260. The sliding frame 210 is connected to the grinding table 100 via a moving unit 500 and can slide along the axial direction of the grinding workpiece 300 on the grinding table 100. The displacement assembly is used to drive the loading frame 220 to move independently relative to the sliding frame 210 along the radial direction of the grinding workpiece 300.

[0024] Specifically, the displacement assembly includes a second motor 280 fixed to the loading frame 220, and a first threaded rod 290 rotatably connected to the loading frame 220 via bearings. A first threaded sleeve 2100 is threaded onto the first threaded rod 290, and the first threaded sleeve 2100 is fixedly connected to the sliding frame 210. The output shaft of the second motor 280 is connected to the first threaded rod 290 via a second pulley transmission mechanism 2110.

[0025] It should be understood that when the second motor 280 starts, it drives the first threaded rod 290 to rotate through the second belt pulley transmission mechanism 2110. Since the first threaded sleeve 2100 is fixed to the sliding frame 210, the rotation of the first threaded rod 290 pushes the loading frame 220 to move the grinding wheel 260 radially. The displacement components of the two grinding units 200 are independently controlled, and the radial position and feed amount of each grinding wheel 260 can be adjusted respectively.

[0026] A first motor 230 is mounted on the loading frame 220. A connecting shaft 240 is also rotatably connected to the loading frame 220 via bearings. The output shaft of the first motor 230 and the connecting shaft 240 are connected by a first belt pulley transmission mechanism 250. The connecting shaft 240 and the grinding wheel 260 are detachably connected and can be connected by key or tapered fit, etc., to facilitate quick replacement of the grinding wheel 260 after wear.

[0027] The grinding wheel 260 is provided with a protective cover 270. The protective cover 270 includes a back plate and a cover plate that are connected to each other. The back plate is fixed on the loading frame 220 and connected to the connecting shaft 240 through a bearing. The cover plate is detachably installed on the back plate by bolts. The protective cover 270 serves both a safety protection function, preventing grinding debris from flying and accidental contact by operators, and a mounting base for the straightening unit 400.

[0028] According to the appendix Figure 6 To be continued Figure 8 As shown, the correction unit 400 is mounted on at least one set of grinding units 200. In this embodiment, it is mounted on the grinding unit 200 located above the grinding workpiece 300. The correction unit 400 includes a first hydraulic cylinder 410, a connecting frame 420, a sleeve 430, a sliding shaft 440, a first roller 450, a fixing frame 460, a displacement sensor 470, a spring 480, a second hydraulic cylinder 490, and a second roller 4100.

[0029] Specifically, the cylinder body of the first hydraulic cylinder 410 is fixedly installed on the cover plate of the protective cover 270, and its piston rod extends and retracts radially along the grinding part 300. The extension and retraction end of the first hydraulic cylinder 410 is fixed with a connecting frame 420, and a sleeve 430 is fixed on the connecting frame 420.

[0030] The sleeve 430 is a cylindrical component with a sliding cavity along the axial direction inside. The sliding shaft 440 is slidably fitted into the cavity of the sleeve 430, with one end extending out of the sleeve 430 and close to the grinding part 300. The first roller 450 is rotatably connected to the end of the sliding shaft 440 close to the grinding part 300 through a deep groove ball bearing, so that the first roller 450 can rotate freely around its own axis.

[0031] A mounting bracket 460 is installed at the end of the sleeve 430 away from the first roller 450. The displacement sensor 470 is fixed on the mounting bracket 460. The detection end of the displacement sensor 470 is in contact with the end face of the sliding shaft 440 away from the first roller 450 to directly sense the axial displacement of the sliding shaft 440. The displacement sensor 470 can be a contact linear displacement sensor 470, such as a resistive linear displacement sensor 470.

[0032] A ring of radially protruding sliding bumps is fixed on the outer circumferential surface of the middle part of the sliding shaft 440. The spring 480 is sleeved on the outside of the sliding shaft 440, and the two ends of the spring 480 abut against the end face of the sleeve 430 near the grinding part 300 and the sliding bumps, respectively.

[0033] It should be noted that, under natural conditions, the spring 480 pushes the sliding protrusion and the sliding shaft 440 together away from the displacement sensor 470 with a certain amount of pre-compression, so that the first roller 450 is elastically attached to the outer circumference of the grinding part 300 with a constant pre-pressure when no bending deformation occurs.

[0034] The cylinder body of the second hydraulic cylinder 490 is also fixedly installed on the cover plate of the protective cover 270. Its piston rod extends and retracts radially along the grinding part 300. The extension and retraction end of the second hydraulic cylinder 490 is rotatably connected to the second roller 4100 through the bearing, so that the second roller 4100 can also rotate freely around its own axis.

[0035] The extension and retraction directions of the sliding shaft 440 and the second hydraulic cylinder 490 are both arranged radially along the grinding workpiece 300, and their axes both point towards the center of the grinding workpiece 300. That is, the contact point between the first roller 450 and the workpiece surface, the contact point between the second roller 4100 and the workpiece surface, and the center of the workpiece are collinear. This collinear arrangement ensures that the detection and correction forces act in the same radial direction, and the correction force can be accurately aligned with the deformation direction without generating additional torque.

[0036] The corrective unit 400 operates as follows: Before processing, based on the initial diameter of the workpiece 300, the first hydraulic cylinder 410 drives its piston rod to extend and retract, adjusting the sleeve 430, sliding shaft 440, and first roller 450 as a whole to an appropriate initial radial position, so that the first roller 450 is attached to the surface of the workpiece 300 with the preload provided by the spring 480. At this time, the output value of the displacement sensor 470 is calibrated to zero.

[0037] During the grinding process, the grinding part 300 undergoes radial bending deformation due to grinding force, release of internal residual stress, or thermal deformation, and a certain part of its outer peripheral surface protrudes outward. When the protruding area rotates to the position of the first roller 450, the surface of the grinding part 300 presses against the first roller 450, pushing the sliding shaft 440 to overcome the elastic force of the spring 480 and retract axially away from the grinding part 300. The axial displacement of the sliding shaft 440 is detected in real time by the displacement sensor 470, which outputs an electrical signal proportional to the deformation.

[0038] After receiving the signal from the displacement sensor 470, the controller calculates the required corrective force based on the signal amplitude and direction. It then controls the piston rod of the second hydraulic cylinder 490 to extend accordingly, pushing the second roller 4100 to apply a reverse compressive force to the deformed area of ​​the grinding workpiece 300 from the same radial direction, pushing the protruding portion back. During the correction process, the first roller 450 continuously monitors the deformation recovery, and the output signal of the displacement sensor 470 gradually decreases as the deformation decreases. When the signal returns to the allowable threshold range, indicating that the deformation has been effectively corrected, the controller reduces the output force of the second hydraulic cylinder 490 until it reaches zero, completing one correction cycle.

[0039] It should be noted that during this correction process, the first roller 450 only contacts the workpiece surface with light pressure from the spring 480 for contact sensing and does not participate in force application correction; the second roller 4100 only applies correction force according to instructions and does not participate in deformation detection. The functions of the two are strictly separated, and the magnitude of the correction force is completely independent of the grinding radial feed rate set by the displacement component of the grinding unit 200.

[0040] Therefore, the grinding depth of the grinding wheel 260 remains unchanged during the correction process, and no additional material is removed due to correction. The workpiece diameter will not be too small due to correction, which fundamentally solves the technical problem of over-grinding during correction in the traditional force balance scheme.

[0041] According to the appendix Figure 2 As shown, the moving unit 500 is disposed between the grinding table 100 and the sliding frame 210, and is used to drive the grinding unit 200 to reciprocate along the axial direction of the grinding workpiece 300. The moving unit 500 includes a second threaded rod 510 rotatably connected to the grinding table 100 and a third motor 530 fixed to the grinding table 100. The output shaft of the third motor 530 is fixedly connected to the second threaded rod 510 through a coupling or directly. A second threaded sleeve 520 is threadedly connected to the second threaded rod 510, and the outer periphery of the second threaded sleeve 520 is fixedly connected to the sliding frame 210.

[0042] It should be noted that when the third motor 530 drives the second threaded rod 510 to rotate, the rotational motion is converted into linear motion of the second threaded sleeve 520 and the sliding frame 210 along the axial direction of the grinding workpiece 300 through the threaded pair. This drives the entire grinding unit 200 and the straightening unit 400 to move along the axial direction of the workpiece, so that the grinding action area of ​​the grinding wheel 260 and the contact straightening area of ​​the straightening unit 400 cover the entire length of the workpiece.

[0043] To improve the axial movement accuracy and load-bearing capacity, two guide rails 540 are fixed on the grinding table 100, arranged parallel to the second threaded rod 510. Each guide rail 540 is slidably connected to a guide sleeve 550, which is fixedly connected to the sliding frame 210 by bolts. The guide rails 540 and guide sleeves 550 form a rolling or sliding linear guide pair, which bears the overturning moment and axial force generated during the grinding process, ensuring the linearity of the grinding unit 200 during its full stroke.

[0044] According to the appendix Figure 3As shown, the clamping unit 600 is disposed at both ends of the grinding area for coaxially clamping the grinding workpiece 300 and driving it to rotate. The clamping unit 600 includes a first clamping component 610 and a second clamping component 630 disposed at both ends of the grinding area. Both the first clamping component 610 and the second clamping component 630 are provided with linear movement components, such as a lead screw guide module driven by a servo motor or a cylinder linear movement component, which can drive the first clamping component 610 and the second clamping component 630 to move closer or further away from each other along the axial direction of the grinding workpiece 300 to accommodate workpieces of different lengths.

[0045] The first clamping assembly 610 is equipped with a chuck 620, which is a three-jaw or four-jaw self-centering chuck that can actively clamp one end of the grinding part 300 and drive it to rotate by a built-in spindle motor, thereby causing the entire grinding part 300 to rotate at a constant speed around its own axis. The second clamping assembly 630 is equipped with a conical centering block 640, the front end of which is a conical surface that cooperates with the center hole at the end of the grinding part 300, providing axial clamping force while achieving radial automatic centering.

[0046] The bottom of both the first clamping assembly 610 and the second clamping assembly 630 is provided with a support platform 650. The support platform 650 includes a lifting cylinder and a V-shaped support plate fixed to the telescopic end of the lifting cylinder.

[0047] It is important to understand that when clamping the workpiece, the lifting cylinder first drives the V-shaped support plate to rise, and the operator places the grinding part 300 in the V-groove of the V-shaped support plate. The workpiece is then lifted to a height coaxial with the chuck 620 and the conical centering block 640.

[0048] Subsequently, the linear moving component drives the two clamping components to approach each other. The chuck 620 clamps one end of the workpiece, and the conical centering block 640 holds the other end of the workpiece. After clamping is completed, the lifting cylinder drives the V-shaped bearing plate to descend and detach from the workpiece. The grinding part 300 is supported only by the chuck 620 and the conical centering block 640 at both ends and can rotate freely.

[0049] Working principle: Step 1: Before processing, the first clamping component 610 and the second clamping component 630 in the clamping unit 600 approach each other along the axial direction under the drive of their respective linear moving components. The lifting cylinder of the bearing table 650 first drives the V-shaped bearing plate to rise, lifting the grinding workpiece 300 to a height coaxial with the chuck 620 and the conical centering clamp 640. The chuck 620 clamps one end of the grinding workpiece 300, and the conical centering clamp 640 centers and supports the other end. Then the lifting cylinder descends to make the bearing plate detach from the workpiece, completing the coaxial clamping.

[0050] Step 2: During processing, the chuck 620 drives the workpiece 300 to rotate at a constant speed around its own axis to ensure that all points on the circumference can be evenly ground and corrected.

[0051] Furthermore, the third motor 530 in the moving unit 500 drives the second threaded rod 510 to rotate, and the rotational motion is converted into linear motion of the sliding frame 210 along the axial direction of the guide rail 540 through the second threaded sleeve 520, thereby driving the entire grinding unit 200 to reciprocate along the axial direction of the grinding workpiece 300, so that the grinding action area of ​​the grinding wheel 260 and the contact correction area of ​​the correction unit 400 cover the entire length of the workpiece.

[0052] Step 3: Two sets of grinding units 200 are symmetrically arranged on both sides of the grinding workpiece 300. In each set of grinding units 200, the second motor 280 of the displacement component drives the first threaded rod 290 to rotate through the second belt pulley transmission mechanism 2110. Since the first threaded sleeve 2100 is fixed to the sliding frame 210, the rotation of the first threaded rod 290 pushes the loading frame 220 to move the grinding wheel 260 radially, thereby independently adjusting the radial feed of each grinding wheel 260.

[0053] During grinding, the first motor 230 drives the grinding wheel 260 to rotate through the first belt pulley transmission mechanism 250 and the connecting shaft 240. The two grinding wheels 260 feed synchronously in opposite directions, so that the radial grinding force is opposite in direction and controllable in magnitude, forming force-balanced grinding, which reduces the bending of the workpiece caused by unidirectional grinding force from the source.

[0054] Step 4: To detect the bending deformation of the workpiece 300 in real time during the grinding process, the correction unit 400 uses pre-detection settings based on elastic contact and displacement sensing to extend and retract the piston rod of the first hydraulic cylinder 410. This allows the radial positions of the sleeve 430, sliding shaft 440, and first roller 450 to be adjusted according to the initial diameter of the workpiece 300, ensuring that the first roller 450 adheres to the outer circumferential surface of the workpiece with appropriate preload. This preload is achieved by the two ends of the spring 480 abutting against the sliding protrusions on the ends of the sleeve 430 and the sliding shaft 440, respectively, ensuring stable contact of the first roller 450 without damaging the workpiece even when it is not bending.

[0055] When the grinding part 300 undergoes radial bending deformation due to grinding force, internal stress, or thermal deformation, the deformed protrusion area will squeeze the first roller 450, pushing the sliding shaft 440 to overcome the force of the spring 480 and contract into the sleeve 430. Its axial displacement is captured in real time by the displacement sensor 470 fixed on the fixed frame 460. The magnitude and direction of the displacement directly correspond to the amplitude and radial direction of the deformation. The contact sensing electrical signal conversion is completed through the displacement sensor 470.

[0056] Step 5: After receiving the output signal from the displacement sensor 470, the controller calculates based on the deformation direction and amplitude, and drives the second hydraulic cylinder 490 to make a corresponding response. The extension and retraction end of the second hydraulic cylinder 490 is connected to the second roller 4100 through a bearing. Its extension and retraction direction is coaxial with the sliding shaft 440 and both point to the center of the grinding part 300.

[0057] When the displacement sensor 470 detects an outward bending deformation at a certain point, i.e., an increase in the radius at that point, it compresses the first roller 450 and causes it to retract. The controller then commands the piston rod of the second hydraulic cylinder 490 to extend, pushing the second roller 4100 to apply a reverse compressive force to the grinding part 300 from the same radial direction, thus physically pushing and correcting the deformed part. Furthermore, since the first roller 450 and the second roller 4100 both act on the same radial line and point towards the center, a balanced radial couple can be formed, avoiding the introduction of additional torque disturbances.

[0058] During this process, the first roller 450 continuously monitors the deformation recovery, and the signal from the displacement sensor 470 gradually decreases. When the deformation returns to the allowable range, the controller reduces the output force of the second hydraulic cylinder 490 until the extrusion stops. By separating the contact detection and force correction functions, the magnitude of the correction force and the grinding depth of the grinding wheel 260 are completely decoupled. The grinding wheel 260 can maintain a uniform and symmetrical feed at all times, without generating additional material removal due to correction requirements, thus completely avoiding over-grinding.

[0059] The embodiments of this specific implementation have been described above. However, this embodiment is not limited to the specific implementation described above. The specific implementation described above is merely illustrative and not restrictive. Those skilled in the art can make many other forms based on the guidance of this embodiment, all of which are within the protection scope of this embodiment.

Claims

1. A grinding device for processing automotive parts, used for grinding the outer surface of the workpiece, characterized in that, include: A polishing table, wherein a polishing area is provided on the polishing table; At least two sets of grinding units are symmetrically arranged on both sides of the grinding area; each set of grinding units includes a sliding frame and a loading frame connected to the sliding frame via a displacement component. A grinding wheel is mounted on the loading frame, and the displacement component can drive the loading frame to move independently relative to the sliding frame along the radial direction of the grinding workpiece to adjust the radial feed of the grinding wheel. A correction unit is installed on at least one set of the grinding units. The correction unit includes a first roller that contacts the outer peripheral surface of the grinding part in an elastically floating manner and a displacement sensor for detecting the radial displacement of the first roller. The correction unit applies radial extrusion force to the outer peripheral deformation position of the grinding part according to the feedback of the displacement sensor, so as to actively correct the bending deformation of the grinding part during the grinding process.

2. The grinding device for processing automotive parts according to claim 1, characterized in that, The grinding wheel is provided with a protective cover, which includes a back plate and a cover plate that are connected to each other.

3. The grinding device for processing automotive parts according to claim 1, characterized in that, The displacement assembly includes a second motor fixed to the loading frame and a first threaded rod rotatably connected to the loading frame. A first threaded sleeve is threaded onto the first threaded rod, and the first threaded sleeve is fixedly connected to the sliding frame. The output shaft of the second motor is connected to the first threaded rod via a second pulley transmission mechanism to drive the loading frame to move radially relative to the sliding frame along the grinding workpiece by rotating the first threaded rod.

4. The grinding device for processing automotive parts according to claim 2, characterized in that, The correction unit further includes a first hydraulic cylinder mounted on the cover plate of the protective cover. The telescopic end of the first hydraulic cylinder is fixed with a connecting frame. A sleeve is provided on the connecting frame. A sliding shaft is slidably connected inside the sleeve. The first roller is rotatably connected to the end of the sliding shaft near the grinding part through a bearing. A fixing frame is installed at the end of the sleeve away from the first roller. The displacement sensor is fixed on the fixing frame.

5. The grinding device for processing automotive parts according to claim 4, characterized in that, The detection end of the displacement sensor is in contact with the sliding shaft to characterize the contact state between the first roller and the grinding workpiece and the radial deformation of the grinding workpiece by the axial displacement of the sliding shaft.

6. The grinding apparatus for processing automotive parts according to claim 4, characterized in that, The sliding shaft is provided with a sliding protrusion and a spring on its outside. The sliding protrusion is fixed on the sliding shaft, and the two ends of the spring abut against the end of the sleeve and the sliding protrusion, respectively, so that the first roller is elastically attached to the surface of the grinding part with a constant preload in the non-correction state.

7. The grinding apparatus for processing automotive parts according to claim 4, characterized in that, A second hydraulic cylinder is also installed on the cover plate of the protective cover, and the extension and retraction end of the second hydraulic cylinder is rotatably connected to a second roller through a bearing.

8. The grinding apparatus for processing automotive parts according to claim 7, characterized in that, The extension and retraction directions of the sliding shaft and the second hydraulic cylinder are both arranged radially along the grinding component, and their axes both point to the center of the grinding component, so as to apply a balanced radial support or corrective force to the grinding component from the same radial direction.

9. The grinding apparatus for processing automotive parts according to claim 1, characterized in that, It also includes a moving unit disposed between the grinding table and the sliding frame, for driving the grinding unit to reciprocate along the axial direction of the grinding workpiece, so that the grinding wheel covers the axial processing range of the grinding workpiece.

10. The grinding apparatus for processing automotive parts according to claim 1, characterized in that, It also includes clamping units disposed at both ends of the grinding area for coaxially clamping the grinding workpiece and driving the grinding workpiece to rotate. The clamping unit includes a first clamping component and a second clamping component disposed at both ends of the grinding area. The first clamping component is provided with a chuck for actively clamping and driving one end of the grinding workpiece to rotate. The second clamping component is provided with a conical centering block for centering and clamping the other end of the grinding workpiece.

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