An automated wheel hub hole grinding and measuring system and method

Abstract

The present invention discloses an automated wheel hub hole grinding and measuring system and method. The system includes an overall control unit, a wheel hub maintenance production line, a wheel hub grinding and measuring unit, a dust collection and chip removal unit, and an automatic tool change unit. The wheel hub grinding and measuring unit is arranged on the wheel hub maintenance production line and includes a ferry transfer mechanism, a three-way drive sliding mechanism, a workpiece grinding unit, and a workpiece measuring unit. The overall control unit controls the dust collection and chip removal unit and the automatic tool change unit to clean the debris after grinding the wheel hub workpiece and replace the grinding head. It controls the workpiece grinding unit to perform circumferential and radial feed grinding on the hub hole of the wheel hub workpiece, clean and lubricate it. It controls the workpiece measuring unit to measure the inner diameter of nine points on three sides of the hub hole of the wheel hub workpiece, determine whether the measurement result is qualified, and store the data. It realizes the automatic grinding of the surface of the wheel hub hole and the automatic measurement of the diameter of the wheel hub hole, effectively improving the operation efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of wheel hub hole grinding and measurement, and more specifically, relates to an automated wheel hub hole grinding and measurement system and method. Background Art

[0002] Wheel hub hole grinding and measurement is an important process in the maintenance of EMU wheelsets. The maintenance content includes checking whether there are bumps, scratches, rust and other problems in the wheel seat and wheel hub hole of the EMU axle to be pressed, and polishing and repairing the defective surface of the inner hole, using 120-grit sandpaper for grinding, and cleaning the wheel hub hole after grinding; when measuring the wheel hub hole, the operator needs to use a manual inside diameter micrometer and use the three-side nine-point method for measurement, and then add the values of the nine points and take the average value as the diameter value of the hub hole; it can be seen that there are a series of problems on the maintenance site at present, such as the lack of intelligence and automation of operating equipment, uncertainty in manual grinding and measurement, and inability to guarantee quality. Summary of the Invention

[0003] In response to the above defects or improvement needs of the prior art, the present invention provides an automated wheel hub hole grinding and measurement system and method, which realizes automatic grinding of the wheel hub hole surface and automatic measurement of the wheel hub hole diameter, effectively improves work efficiency, eliminates the uncertainty of manual grinding and measurement, improves the quality of grinding and measurement, and effectively controls the quality of wheelset press-fitting.

[0004] In order to achieve the above-mentioned object, one aspect of the present invention provides an automated wheel hub hole grinding and measuring system, comprising an overall control unit, a wheel hub repair production line, a wheel hub grinding and measuring unit, a dust removal and chip removal unit, and an automatic tool changing unit; wherein,

[0005] The wheel hub grinding and measuring unit is provided on the wheel hub maintenance production line, and includes a ferrying and circulating mechanism, a three-way driving and sliding mechanism provided on the periphery of the ferrying and circulating mechanism, and a workpiece grinding unit and a workpiece measuring unit provided on the three-way driving and sliding mechanism;

[0006] The overall control unit is communicatively connected with the wheel hub maintenance production line, the wheel hub grinding and measuring unit, the dust and chip removal unit, and the automatic tool changing unit respectively;

[0007] The overall control unit controls the ferry transfer mechanism to realize the transfer of the hub workpiece at different workstations; the overall control unit controls the dust collection and chip removal unit and the automatic tool changing unit to clean the chips and replace the grinding head after grinding the hub workpiece; the overall control unit controls the workpiece grinding unit to perform circumferential and radial feed grinding, cleaning and oiling of the hub hole of the hub workpiece; the overall control unit controls the workpiece measuring unit to measure the inner diameter of the hub hole of the hub workpiece at three sides and nine points, determine the measurement results to be qualified and store the data.

[0008] Further, the ferry transfer mechanism includes a hub conveying unit in a straight line with the hub maintenance production line, a mandrel lifting and positioning mechanism arranged on the hub conveying unit, and a ferry plate clamping mechanism arranged above the mandrel lifting and positioning mechanism;

[0009] The hub conveying unit includes a bottom support frame, a horizontal conveying roller group arranged on the bottom support frame, and a workpiece loading station, a workpiece grinding and measuring station, and a workpiece unloading station arranged in sequence on the horizontal conveying roller group;

[0010] Both ends of the horizontal conveying roller group are seamlessly docked with the hub maintenance production line to realize the free transfer of hub workpieces between the hub maintenance production line and the hub conveying unit.

[0011] Further, the three-way driving sliding mechanism includes column components respectively arranged on both sides of the hub conveying unit, a longitudinal sliding unit arranged on the top of the column components, a transverse sliding unit horizontally and longitudinally sliding on the longitudinal sliding unit, and a vertical sliding unit vertically sliding on the transverse sliding unit;

[0012] The longitudinal sliding unit includes a first slide rail respectively arranged on the tops of the two column components and a first lead screw respectively arranged on the opposite sides of the two first slide rails; the longitudinal central axes of the two first slide rails are consistent with the longitudinal central axis of the hub conveying unit;

[0013] The transverse sliding unit includes a second slide rail and a third slide rail vertically and horizontally sliding on the two first slide rails, and a second lead screw and a third lead screw respectively arranged on the opposite sides of the second slide rail and the third slide rail;

[0014] The vertical sliding unit includes a first installation slider horizontally and transversely sliding on the second slide rail and the second lead screw, a second installation slider horizontally and transversely sliding on the third slide rail and the third lead screw, a first vertical slide rod vertically sliding in the center of the first installation slider, and a second vertical slide rod vertically sliding in the center of the second installation slider;

[0015] First grating ruler distance measuring sensors are respectively arranged on the two first slide rails for real-time determining the real-time positions of the second slide rail and the third slide rail; second grating ruler distance measuring sensors are respectively arranged on the second slide rail and the third slide rail for respectively real-time determining the positions of the first installation slider and the second installation slider and uploading them to the overall control unit;

[0016] A position sensor is provided on the first vertical slide bar, which is used to record the real-time vertical position of the workpiece grinding unit in real time and upload it to the overall control unit; a position sensor is also provided on the second vertical slide bar, which is used to record the real-time vertical position of the workpiece measuring unit in real time and upload it to the overall control unit.

[0017] Further, the workpiece grinding unit is arranged at the bottom of the first vertical slide bar; the workpiece measuring unit is arranged at the bottom of the second vertical slide bar;

[0018] The reciprocating movement of the workpiece grinding unit and the workpiece measuring unit in the longitudinal central axis direction of the hub conveying unit is realized through two first slide rails and a first lead screw;

[0019] The reciprocating movement of the workpiece grinding unit in the transverse central axis direction of the hub conveying unit is realized through the second slide rail and the second lead screw;

[0020] The reciprocating movement of the workpiece measuring unit in the transverse central axis direction of the hub conveying unit is realized through the third slide rail and the third lead screw;

[0021] The reciprocating movement of the workpiece grinding unit in the vertical direction is realized by the up and down sliding of the first vertical slide bar inside the first mounting slider;

[0022] The reciprocating feeding movement of the workpiece measuring unit in the vertical direction is realized by the up and down sliding of the second vertical slide bar inside the second mounting slider.

[0023] Further, the workpiece grinding unit includes a circumferential rotation mechanism arranged at the bottom of the first vertical slide bar, a radial feeding mechanism arranged below the circumferential rotation mechanism, and a grinding assembly arranged on the radial feeding mechanism;

[0024] The circumferential rotation mechanism is used to realize the circumferential grinding of the grinding assembly inside the hub hole of the hub workpiece;

[0025] The radial feeding mechanism is used to realize the radial feeding grinding of the grinding assembly inside the hub hole of the hub workpiece.

[0026] Further, the circumferential rotation mechanism includes a mounting plate arranged at the bottom of the first vertical slide bar, a rotating wheel arranged on the mounting plate, and a rotating drive motor for driving the rotating wheel to rotate;

[0027] A through hole for accommodating the grinding assembly to pass through is provided at the center of the rotating wheel;

[0028] The radial feeding mechanism includes two fourth slide rails arranged in parallel and spaced apart at the bottom of the rotating wheel and fourth lead screws arranged on the side of each fourth slide rail;

[0029] Two fourth slide rails are symmetrically arranged on both sides of the through hole;

[0030] The grinding assembly is arranged on the fourth slide rail and the fourth lead screw;

[0031] A radial driving motor is connected to the fourth lead screw; the grinding assembly is driven by the radial driving motor to slide on the fourth slide rail, thereby realizing the radial feeding operation of the grinding assembly in the through hole of the rotating wheel.

[0032] Further, the grinding assembly includes a grinding driving motor, a grinding head arranged at the output end of the grinding driving motor, and a radial floating sensor arranged on the grinding head;

[0033] The grinding head is communicatively connected to the overall control unit through a data cable;

[0034] The grinding head has an automatic tool changing function.

[0035] Further, the workpiece measuring unit includes a joint motor and a rotary indexing mechanism arranged at the bottom of the second vertical slide bar, a measuring head radial feeding reciprocating mechanism arranged at the bottom of the joint motor and the rotary indexing mechanism, a two-point power measuring driving mechanism arranged at the bottom of the measuring head radial feeding reciprocating mechanism, a measuring head arranged at the bottom of the two-point power measuring driving mechanism, and a measuring head protective housing arranged outside the two-point power measuring driving mechanism and the measuring head;

[0036] The joint motor and the rotary indexing mechanism are used to control the measuring head to rotate three times in the circumferential direction in a hub hole section; the second vertical slide bar is lifted vertically to switch the measuring head in the vertical measuring plane;

[0037] The measuring head is communicatively connected to the overall control unit through a data cable.

[0038] Further, the dust collection and chip removal unit includes a dust collector box body and a dust suction pipe connected to the dust collector box body; one end of the dust suction pipe away from the dust collector box body is arranged below the hub hole of the hub workpiece at the workpiece grinding and measuring station;

[0039] The automatic tool changing unit includes an automatic tool changer arranged at intervals on the side of the hub conveying unit and a plurality of grinding tool heads placed on the automatic tool changer.

[0040] Another aspect of the present invention provides an automated method for grinding and measuring a wheel hub hole, including the following steps:

[0041] S1: The overall control unit controls the wheel hub maintenance production line to transport the wheel hub workpiece to the workpiece loading station of the wheel ferry transfer mechanism. The mandrel lifting and positioning mechanism rises to lift the wheel hub workpiece, the ferry plate clamping mechanism clamps the workpiece, and the wheel hub conveying unit operates to transport the ferry clamping mechanism that clamps the wheel hub workpiece to the workpiece grinding and measuring station.

[0042] S2: The overall control unit enables the grinding head to reach the hub hole of the wheel hub workpiece to be ground and controls the workpiece grinding unit to perform the grinding task. After the grinding task is completed, the grinding head automatically replaces the cleaning wheel to clean the hub hole;

[0043] S3: The overall control unit automatically makes the workpiece measurement unit reach the position of the hub hole of the wheel hub workpiece to be measured and controls the workpiece measurement unit to perform a three-surface nine-point measurement task on the hub hole of the wheel hub workpiece and uploads the measurement results to the overall control unit;

[0044] S4: The overall control unit averages the measurement results, determines whether the measurement results are qualified, and then uploads the data to the server for storage;

[0045] S5: The overall control unit controls the three-way drive sliding mechanism to reset the workpiece measuring unit to zero, and the grinding head automatically replaces the oiling wheel to automatically complete the oiling and rust prevention operation for the hub hole of the wheel workpiece;

[0046] S6: The overall control unit controls the hub conveying unit to convey the oiled hub workpiece to the workpiece unloading station and flows out to the hub maintenance production line for the next process.

[0047] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0048] (1) An automated wheel hub hole grinding and measuring system and method of the present invention are provided. A wheel hub grinding and measuring unit, a dust suction and chip removal unit, and an automatic tool change unit are arranged on a wheel hub maintenance production line. The wheel hub maintenance production line, the wheel hub grinding and measuring unit, the dust suction and chip removal unit, and the automatic tool change unit are respectively communicatively connected to an overall control unit. A ferry transfer mechanism is arranged on the wheel hub grinding and measuring unit, a three-way driving sliding mechanism is arranged on the ferry transfer mechanism, a workpiece grinding unit and a workpiece measuring unit are arranged on the three-way driving sliding mechanism. The overall control unit controls the ferry transfer mechanism to realize the transfer of the wheel hub workpiece among different workstations. The overall control unit controls the dust suction and chip removal unit and the automatic tool change unit to clean the chips after grinding the wheel hub workpiece and replace the grinding head. The overall control unit controls the workpiece grinding unit to automatically feed and grind the circumference and radial direction of the hub hole of the wheel hub workpiece, clean and oil it. The overall control unit controls the workpiece measuring unit to automatically measure the inner diameter at three sides and nine points of the hub hole of the wheel hub workpiece, judge whether the measurement result is qualified, and store the data. It can realize the automatic grinding of the surface of the wheel hub hole and the automatic measurement of the diameter of the wheel hub hole, effectively improve the operation efficiency, eliminate the uncertainty of manual grinding and measurement, improve the grinding and measurement quality, and effectively control the wheel set press-fitting quality.

[0049] (2) An automated wheel hub hole grinding and measuring system and method of the present invention can replace the traditional manual grinding and measuring method, realize the automation of the grinding and measuring of the wheel hub hole of the wheel cake, reduce the labor intensity, and improve the working conditions.

[0050] (3) An automated wheel hub hole grinding and measuring system and method of the present invention have precise grinding and measuring methods, reduce the randomness of manual operation, are more conducive to ensuring the operation quality, and reduce the influence on the wheel cake press-fitting caused by poor quality in the grinding link.

[0051] (4) An automated wheel hub hole grinding and measuring system and method of the present invention can be associated with the existing wheel hub maintenance production line and the wheel cake three-dimensional library to form a pipeline operation mode, greatly improving the operation efficiency.

[0052] (5) An automated wheel hub hole grinding and measuring system and method of the present invention can realize data acquisition, storage and qualified judgment during the grinding and measuring operation process, and upload the data to the wheel cake database, realizing later data traceability and the standardization and digitization of the operation process and data management. Description of the Drawings

[0053] Figure 1 It is a schematic diagram of the overall structure of the working state of an automated wheel hub hole grinding and measuring system according to an embodiment of the present invention;

[0054] Figure 2Schematic diagram of the overall layout structure of the hub grinding and measuring unit, dust suction and chip removal unit, and automatic tool change unit of an automated wheel hub hole grinding and measuring system according to an embodiment of the present invention;

[0055] Figure 3 Schematic side view of the overall layout of the hub grinding and measuring unit, dust suction and chip removal unit, and automatic tool change unit of an automated wheel hub hole grinding and measuring system according to an embodiment of the present invention;

[0056] Figure 4 Schematic diagram of the overall structure of the workpiece measuring unit side of an automated wheel hub hole grinding and measuring system according to an embodiment of the present invention;

[0057] Figure 5 Schematic diagram of the overall structure of the workpiece grinding unit of an automated wheel hub hole grinding and measuring system according to an embodiment of the present invention;

[0058] Figure 6 Schematic diagram of the overall structure of the workpiece measuring unit of an automated wheel hub hole grinding and measuring system according to an embodiment of the present invention;

[0059] Figure 7 Schematic diagram of the overall structure of the workpiece measuring unit of an automated wheel hub hole grinding and measuring system after installing the measuring head protective housing according to an embodiment of the present invention;

[0060] Figure 8 Schematic flow chart of an automated wheel hub hole grinding and measuring method according to an embodiment of the present invention.

[0061] In all the drawings, the same reference numerals denote the same technical features, specifically: 1 - overall control unit, 2 - hub maintenance production line, 3 - hub grinding and measuring unit, 31 - ferry transfer mechanism, 311 - hub conveying unit, 3111 - bottom support frame, 3112 - horizontal conveying roller group, 312 - mandrel lifting and positioning mechanism, 313 - ferry plate clamping mechanism, 314 - workpiece loading station, 315 - workpiece grinding and measuring station, 316 - workpiece unloading station, 32 - three-way driving and sliding mechanism, 321 - column assembly, 322 - longitudinal sliding unit, 323 - transverse sliding unit, 324 - vertical sliding unit, 3241 - first mounting slider, 3242 - second mounting slider, 3243 - first vertical sliding rod, 3244 - second vertical sliding rod, 33 - workpiece grinding unit, 331 - circumferential rotation mechanism, 332 - radial feed mechanism, 333 - grinding assembly, 3331 - grinding drive motor, 3332 - grinding head, 3333 - radial floating sensor, 34 - workpiece measuring unit, 341 - joint motor and rotary indexing mechanism, 342 - measuring head radial feed reciprocating mechanism, 343 - two-point power measuring drive mechanism, 344 - measuring head, 345 - measuring head protective housing, 4 - dust and chip removal unit, 41 - vacuum cleaner box body, 42 - dust suction pipe, 5 - automatic tool changer unit, 51 - automatic tool changer rack, 6 - hub workpiece. Detailed implementation manners

[0062] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0063] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, when an element is referred to as "fixed to", "disposed on" or "provided on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element; the terms "mounted", "connected", "connected", "provided" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] In addition, terms such as "first", "second",... are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0065] As Figures 1-7 shown, an aspect of the present invention provides an automated wheel hub hole grinding and measuring system, including an overall control unit 1, a wheel hub maintenance production line 2, a wheel hub grinding and measuring unit 3, a dust collection and chip removal unit 4, and an automatic tool changing unit 5; the overall control unit 1 is respectively communicatively connected to the wheel hub maintenance production line 2, the wheel hub grinding and measuring unit 3, the dust collection and chip removal unit 4, and the automatic tool changing unit 5 for controlling the operations of the wheel hub maintenance production line 2, the wheel hub grinding and measuring unit 3, the dust collection and chip removal unit 4, and the automatic tool changing unit 5; the wheel hub grinding and measuring unit 3 is disposed on the wheel hub maintenance production line 2 and includes a ferry transfer mechanism 31, a three-way driving and sliding mechanism 32 disposed outside the ferry transfer mechanism 31, and a workpiece grinding unit 33 and a workpiece measuring unit 34 disposed on the three-way driving and sliding mechanism 32; the ferry transfer mechanism 31 is used to realize the transfer of the wheel hub workpiece 6 at different workstations; the three-way driving and sliding mechanism 32 is used to realize the reciprocating motions of the workpiece grinding unit 33 and the workpiece measuring unit 34 in three directions, namely, the transverse (X direction), longitudinal (Y direction), and vertical (Z direction), so as to realize the all-round grinding and measurement of the wheel hub workpiece 6; the overall control unit 1 controls the dust collection and chip removal unit 4 and the automatic tool changing unit 5 to clean the chips after the wheel hub workpiece is ground and replace the grinding head; the overall control unit 1 controls the three-way driving and sliding mechanism 32 and further controls the reciprocating motions of the workpiece grinding unit 33 in the longitudinal, transverse, and vertical directions to realize the circumferential and radial feeding grinding of the grinding head on the hub hole of the wheel hub workpiece, cleaning and oiling; the overall control unit 1 controls the three-way driving and sliding mechanism 32 and further controls the reciprocating motions of the workpiece measuring unit 34 in the longitudinal, transverse, and vertical directions to realize the three-side and nine-point inner diameter measurement of the hub hole of the wheel hub workpiece by the measuring head and upload it to the overall control unit 1; the overall control unit 1 takes the average value of the three-side and nine-point inner diameter measurement data, determines whether the measurement result is qualified, and stores the data.

[0066] Further, as Figures 1-7As shown in the figure, the ferry transfer mechanism 31 includes a hub conveying unit 311 that is in a straight line with the hub maintenance production line 2, a mandrel lifting and positioning mechanism 312 provided on the hub conveying unit 311, and a ferry plate clamping mechanism 313 provided above the mandrel lifting and positioning mechanism 312; the hub conveying unit 311 includes a bottom support frame 3111, a horizontal conveying roller group 3112 provided on the bottom support frame 3111, and a workpiece loading station 314, a workpiece grinding and measuring station 315, and a workpiece unloading station 316 that are sequentially provided on the horizontal conveying roller group 3112; positioning stop pins are respectively provided at the workpiece loading station 314, the workpiece grinding and measuring station 315, and the workpiece unloading station 316 for achieving precise positioning of the hub workpiece at different stations; both ends of the horizontal conveying roller group are seamlessly docked with the hub maintenance production line 2 to achieve the free flow of the hub workpiece 6 between the hub maintenance production line 2 and the hub conveying unit 311; a workpiece in-position sensor is provided on the mandrel lifting and positioning mechanism 312; the workpiece in-position sensor is communicatively connected to the overall control unit 1.

[0067] Further, as Figures 1-7As shown, the three-way driving sliding mechanism 32 includes column components 321 respectively arranged on both sides of the hub conveying unit 311, a longitudinal sliding unit 322 arranged on the top of the column components 321, a transverse sliding unit 323 horizontally longitudinally (in the direction consistent with the longitudinal central axis direction of the hub conveying unit) slidably arranged on the longitudinal sliding unit 322, and a vertical sliding unit 324 vertically slidably arranged on the transverse sliding unit 323; the column components 321 include two columns arranged in parallel at intervals along the longitudinal central axis direction of the hub conveying unit; the workpiece grinding unit 33 and the workpiece measuring unit 34 are both arranged on the vertical sliding unit 324; the longitudinal sliding unit 322 includes a first slide rail respectively arranged on the top of the two column components 321 and a first lead screw respectively arranged on the opposite sides of the two first slide rails; the two columns and the first slide rail on the same side of the hub conveying unit together form a gantry frame; the longitudinal central axes of the two first slide rails are consistent with the longitudinal central axis of the hub conveying unit 311; the transverse sliding unit 323 includes a second slide rail and a third slide rail vertically and horizontally longitudinally slidably arranged on the two first slide rails, a second lead screw and a third lead screw respectively arranged on the opposite sides of the second slide rail and the third slide rail; the second slide rail and the third slide rail are arranged in parallel at intervals; the two ends of the second slide rail and the third slide rail are respectively connected to the two first lead screws, and the reciprocating movement of the second slide rail and the third slide rail in the longitudinal central axis direction of the hub conveying unit 311 is realized through the two first slide rails and the two first lead screws; the vertical sliding unit 324 includes a first mounting slider 3241 horizontally transversely (in the direction consistent with the transverse central axis direction of the hub conveying unit) slidably arranged on the second slide rail and the second lead screw, a second mounting slider 3242 horizontally transversely slidably arranged on the third slide rail and the third lead screw, a first vertical slide bar 3243 vertically slidably arranged at the center of the first mounting slider 3241, and a second vertical slide bar 3244 vertically slidably arranged at the center of the second mounting slider 3242.

[0068] Further, as Figures 1-7As shown, the workpiece grinding unit 33 is provided at the bottom of the first vertical slide bar 3243; the workpiece measuring unit 34 is provided at the bottom of the second vertical slide bar 3244; servo motors are respectively connected to the first lead screw, the second lead screw and the third lead screw; the reciprocating movement of the workpiece grinding unit 33 and the workpiece measuring unit 34 in the longitudinal central axis direction of the hub conveying unit 311 is realized by two first slide rails and the first lead screw; the reciprocating movement of the workpiece grinding unit 33 in the transverse central axis direction of the hub conveying unit 311 is realized by the second slide rail and the second lead screw; the reciprocating movement of the workpiece measuring unit 34 in the transverse central axis direction of the hub conveying unit 311 is realized by the third slide rail and the third lead screw; the reciprocating movement of the workpiece grinding unit 33 in the vertical direction is realized by the up and down sliding of the first vertical slide bar 3243 inside the first mounting slider 3241; the reciprocating feed movement of the workpiece measuring unit 34 in the vertical direction is realized by the up and down sliding of the second vertical slide bar 3244 inside the second mounting slider 3242.

[0069] Further, as Figures 1-7As shown, the bottom support frame 3111 is connected to the ground by expansion bolts and leveled by a screw adjustment mechanism; the bottom of the column assembly 321 is connected to the workshop floor by expansion bolts and leveled by a screw adjustment mechanism; the ends of the two first slide rails and the tops of the corresponding column assemblies 321 are connected and fixed by fastening bolts and positioning pins; the two ends of the bottom of the second slide rail and the third slide rail and the two first slide rails are connected by sliders and two first lead screws. Two first grating scale distance measuring sensors are respectively arranged on the two first slide rails. The first lead screws are rotated by a servo motor to drive the second slide rail and the third slide rail to slide on the two first slide rails. The real-time positions of the second slide rail and the third slide rail are determined by the first grating scale distance measuring sensors; second grating scale distance measuring sensors are respectively arranged on the second slide rail and the third slide rail. The second lead screw is driven by a servo motor to drive the first mounting slider 3241 to slide on the second slide rail. At the same time, the position of the first mounting slider 3241 is determined in real time by the second grating scale distance measuring sensor arranged on the second slide rail, that is, the real-time position of the workpiece grinding unit 33 is determined and uploaded to the overall control unit; the third lead screw is driven by a servo motor to drive the second mounting slider 3242 to slide on the third slide rail. At the same time, the position of the second mounting slider 3242 is determined in real time by the second grating scale distance measuring sensor arranged on the third slide rail, that is, the lateral real-time position of the workpiece measuring unit 34 is determined and uploaded to the overall control unit; the workpiece measuring unit 34 is connected to the second vertical slide bar and its driving mechanism by a positioning pin and a fastening screw and communicates with the main control cabinet of the overall control unit 1 through a data cable; the workpiece grinding unit 33 is connected to the first vertical slide bar and its driving mechanism by a positioning pin and a fastening screw and communicates with the main control cabinet of the overall control unit 1 through a data cable; a position sensor is arranged on the first vertical slide bar for recording the real-time position of the workpiece grinding unit 33 in the vertical direction in real time and uploading it to the overall control unit; a position sensor is also arranged on the second vertical slide bar for recording the real-time position of the workpiece measuring unit 34 in the vertical direction in real time and uploading it to the overall control unit.

[0070] Further, as Figures 1-7As shown, the workpiece grinding unit 33 includes a circumferential rotation mechanism 331 provided at the bottom of the first vertical slide bar 3243, a radial feed mechanism 332 provided below the circumferential rotation mechanism 331, and a grinding assembly 333 provided on the radial feed mechanism 332; the circumferential rotation mechanism 331 is used to realize the circumferential grinding of the grinding assembly 333 inside the hub hole of the hub workpiece; the radial feed mechanism 332 is used to realize the radial feed grinding of the grinding assembly 333 inside the hub hole of the hub workpiece; the circumferential rotation mechanism 331 includes a mounting plate provided at the bottom of the first vertical slide bar 3243, a rotating wheel provided on the mounting plate, and a rotating drive motor for driving the rotating wheel to rotate; a through hole for the grinding assembly 333 to pass through is provided at the center of the rotating wheel; the radial feed mechanism 332 includes two fourth slide rails arranged in parallel and spaced below the rotating wheel and fourth lead screws provided on the side of each fourth slide rail; the two fourth slide rails are symmetrically arranged on both sides of the through hole; the grinding assembly 333 is provided on the fourth slide rails and the fourth lead screws; a radial drive motor is connected to the fourth lead screw; the radial drive motor drives the grinding assembly 333 to slide on the fourth slide rails, thereby realizing the radial feed operation of the grinding assembly 333 inside the through hole of the rotating wheel.

[0071] Further, as Figures 1-7 shown, the grinding assembly 333 includes a grinding drive motor 3331, a grinding head 3332 provided at the output end of the grinding drive motor, and a radial floating sensor 3333 provided on the grinding head; according to the shape of the hub workpiece to be ground, the grinding head has the ability of radial constant force floating, the radial force is constant and adjustable, and a radial floating sensor is built in, which can sense the magnitude of the radial swing of the grinding head and the magnitude of the floating force, and can be adjusted online; the grinding head is communicatively connected to the main control cabinet of the overall control unit 1 through a data cable;

[0072] The grinding spindle of the grinding head: 2.2KW, 6000RPM; force control range: 10 - 80N, pressure adjustable; radial floating range: ±6 degrees; floating force control: radial constant force floating, gravity compensation, position judgment; various types of grinding wheels made of different materials can be quickly replaced; maximum outer diameter of abrasive: φ = 150mm.

[0073] The grinding head has an automatic tool changing function and can replace grinding heads with various functions according to actual needs, such as cloth wheels, polishing wheels, oiling wheels, etc. to meet the cleaning, grinding and oiling operations of the wheel hub hole.

[0074] Further, as Figures 1-7As shown in the figure, the overall control unit 1 includes a main control cabinet, a computer client, and a server. The overall control unit 1 includes an upper-layer system, a management end, and an operation end; the upper-layer system is connected to the MES; a wheel hub three-dimensional warehouse is provided at the output end of the wheel hub maintenance production line 2; the management end includes a server, a data interface, a wireless AP, and an electronic display board; managers at all levels can query data and supervise the operation process through the management end; the operation end includes a main control cabinet (control terminal). After the operation end collects and uploads the data of each functional module in real time, and after passing the qualification judgment, it is stored in the wheel cake three-dimensional warehouse to provide data support for subsequent axle matching.

[0075] Further, as Figures 1-7 shown, the workpiece measurement unit 34 includes a joint motor and a rotary indexing mechanism 341 provided at the bottom of the second vertical slide bar 3244, a measuring head radial feed reciprocating mechanism 342 provided at the bottom of the joint motor and the rotary indexing mechanism 341, a two-point power measurement driving mechanism 343 provided at the bottom of the measuring head radial feed reciprocating mechanism 342, a measuring head 344 provided at the bottom of the two-point power measurement driving mechanism 343, and a measuring head protective housing 345 provided outside the two-point power measurement driving mechanism 343 and the measuring head 344; the joint motor and the rotary indexing mechanism 341 control the measuring head 344 to rotate three times in the circumferential direction in a hub hole section; the specific rotation angle executed by the joint motor and the rotary indexing mechanism 341 is adjusted according to the process requirements by setting the program of the overall control unit 1; by controlling the lifting of the second vertical slide bar 3244 in the vertical direction, the measurement plane of the measuring head 344 is switched. Usually, it only needs to be switched three times to obtain the nine-point inner diameter measurement values of the hub hole in three different sections; the measuring head 344 is communicatively connected to the main control cabinet of the overall control unit 1 through a data cable; the measuring head 344 transmits the measured hub hole diameter value back to the computer client of the main control cabinet in real time through the data cable. The computer client software takes the average value of the three-sided nine-point inner diameter measurement data, judges the qualification of the measurement result, and then uploads the data to the server of the overall control unit 1 for storage; that is, in the previous process, the ferry plate operation transfer mechanism has accurately positioned the workpiece, found the hub hole position according to the measuring head coordinate points, used the rotary drive at the end of the measuring head vertical slide rail lifting mechanism for indexing, performed three-point measurement on one side at a time, and then switched the measurement plane of the measuring head to complete the three-sided nine-point measurement. Finally, the average value is taken and uploaded to the system server.

[0076] Further, as Figures 1-7As shown in the figure, the dust suction and chip removal unit 4 includes a vacuum cleaner box body 41 and a suction pipe 42 connected to the vacuum cleaner box body 41; the vacuum cleaner box body 41 is arranged between the hub conveying unit 311 and one of the column assemblies 321; one end of the suction pipe 42 away from the vacuum cleaner box body 41 is arranged below the hub hole of the hub workpiece 6 at the workpiece grinding and measuring station; after starting the vacuum cleaner box body 41, dust is sucked from below the hub hole of the hub workpiece 6.

[0077] Further, as Figures 1-7 shown in the figure, the automatic tool change unit 5 includes an automatic tool changer 51 arranged at intervals on the side of the hub conveying unit 311 and a plurality of grinding tool heads placed on the automatic tool changer 51; by setting a grinding head tool magazine on the automatic tool changer 51 and designing different tool heads, such as a polishing cloth wheel and an oiling wheel, the rotation speed of the grinding head is controlled by the program setting of the overall control unit 1 to perform wiping and dust removal on the surface of the workpiece hub hole and oiling and rust prevention operations after hub hole measurement; by adopting a slide rail drive mechanism designed in the longitudinal, transverse, and vertical directions, i.e., the X, Y, and Z directions, to drive the movement of the grinding head in three directions, the compensation feed of the grinding head during grinding is realized. Specifically, a circle is drawn through the differential interpolation in the X and Y directions, and the vertical feed is completed in the Z direction; a circumferential rotation mechanism is designed below the front end of the grinding head support arm, and a radial feed mechanism is designed below the circumferential rotation mechanism, and the grinding head is installed on the radial feed mechanism; by combining the circumferential rotation mechanism, the radial feed mechanism, and the vertical guiding mechanism, the grinding operation of the grinding head inside the inner hole of the workpiece is completed.

[0078] As Figure 8 shown in the figure, another aspect of the present invention provides an automated method for grinding and measuring the hub holes of a wheel, including the following steps:

[0079] S1: The overall control unit controls the hub maintenance production line to convey the hub workpiece to the workpiece loading station of the wheel ferry transfer mechanism. The core shaft lifting and positioning mechanism rises to lift the hub workpiece, and the ferry plate clamping mechanism clamps the workpiece. The hub conveying unit operates to convey the ferry clamping mechanism clamping the hub workpiece to the workpiece grinding and measuring station. Specifically, the whole machine is reset to make the grinding head in a high position, the core shaft lifting and positioning mechanism in a low position, and the ferry clamping mechanism in an open position; specifically, after the workpiece in-position sensor at the workpiece loading station detects that the hub workpiece is in position, it sends a signal to the overall control unit. The overall control unit controls the core shaft lifting and positioning mechanism to rise to lift the hub workpiece, and the ferry plate clamping mechanism clamps the workpiece from four points; the overall control unit controls the hub conveying unit of the ferry transfer mechanism to operate to convey the ferry clamping mechanism clamping the hub workpiece to the workpiece grinding and measuring station. Specifically, through the flow of the conveyor line, the ferry plate and the workpiece flow to the grinding and measuring station and are positioned by the positioning stop pin.

[0080] S2: The overall control unit makes the grinding head reach the position to be ground of the hub hole of the hub workpiece and controls the workpiece grinding unit to perform the grinding task. After the grinding task is completed, the grinding head automatically replaces the cleaning wheel to clean the hub hole. Specifically, the three-way drive sliding mechanism is used to lower the grinding head to the edge of the workpiece. The position sensor on the first vertical slide bar records the vertical position of the grinding head in real time and transmits the signal back to the overall control unit. The overall control unit controls the rotation of the grinding head grinding wheel, and the feed motor of the grinding head works, so that the grinding head reaches the cutting position relative to the hub hole of the workpiece. The execution of the grinding task includes simultaneously and synchronously controlling the circumferential rotation mechanism, the radial feed mechanism and the vertical sliding unit on the grinding head, so that the grinding head makes a circumferential polishing movement in the hub hole of the hub workpiece, and the grinding head grinding wheel descends from the high position to the lowest position in the vertical direction for grinding operations. The overall control unit controls the circumferential rotation mechanism and the radial feed mechanism on the grinding head to perform a lifting tool action, so that the grinding head grinding wheel disengages from the workpiece surface. The vertical lifting mechanism on the vertical sliding unit acts to bring the grinding wheel back to the upper end face of the workpiece feed. The grinding head replaces the grinding wheel to clean the hub hole. After cleaning, the workpiece grinding unit returns to zero, the grinding head moves horizontally to make way, and the position of the hub workpiece and its clamping mechanism remain unchanged, and the measuring head is ready for work.

[0081] S3: The overall control unit makes the workpiece measuring unit automatically reach the position to be measured of the hub hole of the hub workpiece and controls the workpiece measuring unit to perform a three-sided nine-point measurement task on the hub hole of the hub workpiece and upload the measurement results to the overall control unit. Specifically, the workpiece measuring unit returns to zero. The overall control unit controls the three-way drive sliding mechanism to act to align the workpiece measuring unit with the center of the hub hole and lower it to directly above the hub hole of the hub workpiece. The measuring head descends to directly above the workpiece. The position sensor on the second vertical slide bar records the vertical position of the measuring head in real time and transmits the signal back to the overall control unit. The overall control unit controls the measuring head to descend and enter the hub hole of the workpiece, and rotate three times along the circumferential direction to measure three inner diameter cross-section values on the first cross-section of the hub hole. The measuring head descends a certain depth along the central axis of the workpiece hub hole again and rotates three times along the circumferential direction to measure three inner diameter cross-section values on the second cross-section of the hub hole. The measuring head descends a certain depth along the central axis of the workpiece hole again and rotates three times along the circumferential direction to measure three inner diameter cross-section values on the third cross-section of the hub hole. The measuring head immediately transmits the measured hub hole diameter value back to the computer client of the overall control unit.

[0082] S4: The overall control unit takes the average value of the measurement results, makes a qualified judgment on the measurement results, and then uploads the data to the server for storage. Specifically, the computer client software of the overall control unit takes the average value of the three-sided nine-point data, makes a qualified judgment on the measurement results, and then uploads the data to the server of the overall control unit for storage.

[0083] S5: The overall control unit controls the three-way driving sliding mechanism to act to zero the workpiece measuring unit. After replacing the grinding head with an oiling wheel and automatically completing the oiling and rust prevention operation on the hub hole of the hub workpiece, the grinding head returns to zero. Specifically, the vertical lifting mechanism acts to bring the measuring head back to the upper end face of the workpiece feeding. After the measuring head finishes measuring, all the mechanisms of the equipment return to the zero position. The grinding head changes the tool, replaces the grinding head with an oiling wheel, and after automatically completing the oiling and rust prevention operation on the hub hole, the grinding head leaves.

[0084] S6: The overall control unit controls the hub conveying unit to act to convey the hub workpiece that has been ground, measured, and oiled to the workpiece discharging station and flow out to the hub maintenance production line and be transported to the wheel disc three-dimensional warehouse.

[0085] The working principle of an automated wheel hub hole grinding and measuring system and method of the present invention: After the overall control unit 1 controls the hub workpiece 6 to be fed from the hub maintenance production line 2 to the workpiece loading station 314 of the hub conveying unit 311, it is positioned by the mandrel lifting and positioning mechanism 312, and the hub workpiece 4 is lifted. Then, the hub workpiece 4 is clamped by the ferry plate clamping mechanism 322. After the ferry plate clamping mechanism 322 clamps the hub workpiece 4 to form an integral body, it disengages from the mandrel lifting and positioning mechanism 315 and rotates to the workpiece grinding and measuring station 315 by relying on the power of the hub conveying unit 311 and stops positioning through the stop mechanism on the workpiece grinding and measuring station 315. After the overall control unit 1 controls the workpiece grinding unit 33 to grind the hub hole of the hub workpiece 6 in three directions of X, Y, and Z, it controls the workpiece measuring unit 34 to measure the inner diameter of nine points on three measuring planes of the hub hole. After the qualified determination of the measurement result is made through the client of the overall control unit 1, the data is uploaded to the server for storage. Then, the grinding head changes the tool, replaces the grinding head with an oiling wheel, and after automatically completing the oiling and rust prevention operation on the hub hole, the grinding head leaves. After the operation is completed, through the rotation of the hub conveying unit, the hub workpiece reaches the workpiece discharging station 316 and flows out to the hub maintenance production line 2. The present invention can realize the automatic grinding of the surface of the wheel hub hole and the automatic measurement of the wheel hub hole diameter, effectively improve the operation efficiency, eliminate the uncertainty of manual grinding and measurement, improve the grinding and measurement quality, and effectively control the wheel set pressing quality.

[0086] It is easy for those skilled in the art to understand that the above is only a preferred embodiment of the present invention and is not used to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An automated wheel hub hole grinding and measuring system, characterized in that: It includes an overall control unit (1), a hub maintenance production line (2), a hub grinding and measuring unit (3), a dust suction and chip removal unit (4), and an automatic tool change unit (5); among them, The hub grinding and measuring unit (3) is arranged on the hub maintenance production line (2), and includes a ferry transfer mechanism (31), a three-way drive sliding mechanism (32) arranged outside the ferry transfer mechanism (31), and a workpiece grinding unit (33) and a workpiece measuring unit (34) arranged on the three-way drive sliding mechanism (32); The workpiece measuring unit (34) includes a joint motor and a rotary indexing mechanism (341) arranged on the three-way drive sliding mechanism (32), a measuring head radial feed reciprocating mechanism (342) arranged at the bottom of the joint motor and the rotary indexing mechanism (341), a two-point power measuring drive mechanism (343) arranged at the bottom of the measuring head radial feed reciprocating mechanism (342), a measuring head (344) arranged at the bottom of the two-point power measuring drive mechanism (343), and a measuring head protective housing (345) arranged outside the two-point power measuring drive mechanism (343) and the measuring head (344); The joint motor and the rotary indexing mechanism (341) are used to control the measuring head (344) to rotate three times in the circumferential direction in a hub hole section; the three-way drive sliding mechanism (32) is used for lifting in the vertical direction to switch the measuring head (344) in the vertical measuring plane; The measuring head (344) is communicatively connected to the overall control unit (1) through a data cable; The overall control unit (1) is communicatively connected to the hub maintenance production line (2), the hub grinding and measuring unit (3), the dust suction and chip removal unit (4), and the automatic tool change unit (5) respectively; The ferry transfer mechanism (31) is controlled by the overall control unit (1) to realize the transfer of the hub workpiece (6) between different workstations; the dust suction and chip removal unit (4) and the automatic tool change unit (5) are controlled by the overall control unit (1) to clean the chips after hub workpiece grinding and replace the grinding head; the workpiece grinding unit (33) is controlled by the overall control unit (1) to automatically feed and grind the circumference and radius of the hub hole of the hub workpiece, clean and oil it; the workpiece measuring unit (34) is controlled by the overall control unit (1) to measure the inner diameter of the hub hole of the hub workpiece at three sides and nine points, judge whether the measurement result is qualified and store the data.

2. The automated wheel hub hole grinding and measuring system according to claim 1, wherein: The ferry transfer mechanism (31) includes a hub conveying unit (311) in a straight line with the hub maintenance production line (2), a mandrel lifting and positioning mechanism (312) arranged on the hub conveying unit (311), and a ferry plate clamping mechanism (313) arranged above the mandrel lifting and positioning mechanism (312); The hub conveying unit (311) includes a bottom support frame, a horizontal conveying roller group arranged on the bottom support frame, and a workpiece loading station, a workpiece grinding and measuring station, and a workpiece unloading station arranged in sequence on the horizontal conveying roller group; Both ends of the horizontal conveying roller group are seamlessly docked with the hub maintenance production line (2) to achieve the free flow of hub workpieces (6) on the hub maintenance production line (2) and the hub conveying unit (311).

3. An automated wheel hub hole grinding and measuring system according to claim 2, characterized in that: The three-way driving sliding mechanism (32) includes column components (321) respectively arranged on both sides of the hub conveying unit (311), a longitudinal sliding unit (322) arranged on the top of the column components (321), a transverse sliding unit (323) horizontally and longitudinally slidably arranged on the longitudinal sliding unit (322), and a vertical sliding unit (324) vertically slidably arranged on the transverse sliding unit (323); The longitudinal sliding unit (322) includes first slide rails respectively arranged on the tops of the two column components (321) and first lead screws respectively arranged on the opposite side surfaces of the two first slide rails; the longitudinal central axes of the two first slide rails are consistent with the longitudinal central axis of the hub conveying unit (311); The transverse sliding unit (323) includes a second slide rail and a third slide rail vertically and horizontally slidably arranged on the two first slide rails, and a second lead screw and a third lead screw respectively arranged on the opposite side surfaces of the second slide rail and the third slide rail; The vertical sliding unit (324) includes a first mounting slider (3241) horizontally and transversely slidably arranged on the second slide rail and the second lead screw, a second mounting slider (3242) horizontally and transversely slidably arranged on the third slide rail and the third lead screw, a first vertical slide rod (3243) vertically slidably arranged at the center of the first mounting slider (3241), and a second vertical slide rod (3244) vertically slidably arranged at the center of the second mounting slider (3242); First grating scale distance measuring sensors are respectively arranged on the two first slide rails for determining the real-time positions of the second slide rail and the third slide rail in real time; second grating scale distance measuring sensors are respectively arranged on the second slide rail and the third slide rail for respectively determining the positions of the first mounting slider (3241) and the second mounting slider (3242) in real time and uploading them to the overall control unit; A position sensor is arranged on the first vertical slide rod for recording the real-time vertical position of the workpiece grinding unit (33) in real time and uploading it to the overall control unit; a position sensor is also arranged on the second vertical slide rod for recording the real-time vertical position of the workpiece measuring unit (34) in real time and uploading it to the overall control unit.

4. An automated wheel hub hole grinding and measuring system according to claim 3, characterized in that: The workpiece grinding unit (33) is arranged at the bottom of the first vertical slide rod (3243); the workpiece measuring unit (34) is arranged at the bottom of the second vertical slide rod (3244); The reciprocating movement of the workpiece grinding unit (33) and the workpiece measuring unit (34) in the longitudinal central axis direction of the hub conveying unit (311) is realized through the two first slide rails and the first lead screw; The reciprocating movement of the workpiece grinding unit (33) in the transverse central axis direction of the hub conveying unit (311) is realized through the second slide rail and the second lead screw; The reciprocating movement of the workpiece measuring unit (34) in the lateral central axis direction of the hub conveying unit (311) is realized through the third slide rail and the third lead screw; The reciprocating movement of the workpiece grinding unit (33) in the vertical direction is realized by the up-and-down sliding of the first vertical slide bar (3243) inside the first mounting slider (3241); The reciprocating feeding movement of the workpiece measuring unit (34) in the vertical direction is realized by the up-and-down sliding of the second vertical slide bar (3244) inside the second mounting slider (3242).

5. An automated wheel hub hole grinding and measuring system according to claim 4, characterized in that: The workpiece grinding unit (33) includes a circumferential rotation mechanism (331) provided at the bottom of the first vertical slide bar (3243), a radial feeding mechanism (332) provided below the circumferential rotation mechanism (331), and a grinding assembly (333) provided on the radial feeding mechanism (332); The circumferential rotation mechanism (331) is used to realize the circumferential grinding of the grinding assembly (333) inside the hub hole of the hub workpiece; The radial feeding mechanism (332) is used to realize the radial feeding grinding of the grinding assembly (333) inside the hub hole of the hub workpiece.

6. An automated wheel hub hole grinding and measuring system according to claim 5, characterized in that: The circumferential rotation mechanism (331) includes a mounting plate provided at the bottom of the first vertical slide bar (3243), a rotating wheel provided on the mounting plate, and a rotating drive motor for driving the rotating wheel to rotate; A through hole for accommodating the grinding assembly (333) to pass through is provided at the center of the rotating wheel; The radial feeding mechanism (332) includes two fourth slide rails arranged in parallel and spaced apart at the bottom of the rotating wheel and fourth lead screws provided on the side of each fourth slide rail; The two fourth slide rails are symmetrically arranged on both sides of the through hole; The grinding assembly (333) is provided on the fourth slide rail and the fourth lead screw; A radial drive motor is connected to the fourth lead screw; the radial drive motor drives the grinding assembly (333) to slide on the fourth slide rail, thereby realizing the radial feeding operation of the grinding assembly (333) inside the through hole of the rotating wheel.

7. An automated wheel hub hole grinding and measuring system according to claim 6, characterized in that: The grinding assembly (333) includes a grinding drive motor (3331), a grinding head (3332) provided at the output end of the grinding drive motor, and a radial floating sensor (3333) provided on the grinding head; The grinding head (3332) is communicatively connected to the overall control unit (1) through a data cable; The grinding head has an automatic tool changing function.

8. An automated wheel hub hole grinding and measuring system according to claim 7, wherein: The dust suction and chip removal unit (4) includes a dust collector box body (41) and a dust suction pipe (42) connected to the dust collector box body (41); one end of the dust suction pipe (42) away from the dust collector box body (41) is provided below the hub hole of the hub workpiece (6) at the workpiece grinding and measuring station; The automatic tool changing unit (5) includes an automatic tool changer (51) arranged at intervals on the side of the hub conveying unit (311) and a plurality of grinding tool heads placed on the automatic tool changer (51).

9. An automated method for grinding and measuring the holes of a wheel hub, characterized in that, It is realized by applying an automated wheel hub hole grinding and measuring system as described in any one of claims 1-8, including the following steps: S1: The overall control unit controls the hub maintenance production line to convey the hub workpiece to the workpiece loading station of the wheel transfer mechanism. The mandrel lifting and positioning mechanism rises to lift the hub workpiece, and the ferry plate clamping mechanism clamps the workpiece. Then the hub conveying unit operates to convey the ferry clamping mechanism clamping the hub workpiece to the workpiece grinding and measuring station. S2: The overall control unit makes the grinding head reach the position to be ground on the hub hole of the hub workpiece and controls the workpiece grinding unit to perform the grinding task. After the grinding task is completed, the grinding head automatically replaces the cleaning wheel to clean the hub hole. S3: The overall control unit makes the workpiece measuring unit automatically reach the position to be measured on the hub hole of the hub workpiece and controls the workpiece measuring unit to perform the three-sided and nine-point measuring task on the hub hole of the hub workpiece and upload the measuring result to the overall control unit. S4: The overall control unit takes the average value of the said measuring result, makes a judgment on whether the measuring result is qualified, and then uploads the data to the server for storage. S5: The overall control unit controls the three-way drive sliding mechanism to operate to zero the workpiece measuring unit, and the grinding head automatically replaces the oiling wheel to automatically complete the oiling and rust prevention operation on the hub hole of the hub workpiece. S6: The overall control unit controls the hub conveying unit to operate to convey the hub workpiece that has been ground, measured, and oiled to the workpiece unloading station, flow out of the hub maintenance production line, and be transported to the wheel cake three-dimensional warehouse.

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