Method and device for detecting the cooperation of a hub bearing flange with a brake disc cooperation surface

Abstract

The application provides a method and device for detecting the cooperation surface of a hub bearing flange and a brake disc, wherein the method comprises the steps of: obtaining the cooperation surface pattern of the hub bearing flange and the brake disc; identifying defects or foreign matters in the cooperation surface pattern; and alarming when defects or foreign matters exist in the cooperation surface pattern. The application can effectively ensure the qualified rate of the end jump test after the assembly of the brake is completed.

Description

Technical Field

[0001] This invention relates to the field of brake assembly inspection, specifically to a method and apparatus for inspecting the mating surface between a wheel hub bearing flange and a brake disc. Background Technology

[0002] If paint spots, metal shavings, or defects in the bearing-brake disc mating surfaces are mixed in during the assembly of the brake at the base, it will cause the end face runout to exceed the tolerance. After 20,000 km of use, the runout will be converted into DTV, causing brake vibration and thus triggering a brake disc claim.

[0003] like Figure 1 As shown, among 60 assembled brake assemblies, one case of runout exceeding the tolerance was found due to foreign matter contamination, with a runout of 0.056 mm. After the foreign matter was removed, the runout decreased to 0.02 mm.

[0004] Currently available brake assembly runout control devices use a 100-point inspection of the brake assembly runout after assembly. Adjustments are made when runout exceeds tolerance to ensure acceptable runout. However, this device is expensive, occupies approximately 10 square meters, and requires significant space. Furthermore, exceeding runout tolerance necessitates rework and disassembly of the brake disc and wheel hub bearings for defect inspection. This approach is time-consuming, labor-intensive, and inefficient. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the present invention provides a method and apparatus for detecting the mating surface between the wheel hub bearing flange and the brake disc, so as to ensure the pass rate of the brake assembly end-jump inspection.

[0006] To achieve the above and other related objectives, the present invention provides a method for detecting the mating surface between a wheel hub bearing flange and a brake disc, comprising the following steps:

[0007] Obtain the mating surface diagram of the wheel hub bearing flange and the brake disc;

[0008] Defects or foreign objects are identified in the mating surface pattern;

[0009] An alarm will be triggered when there are defects or foreign objects in the mating surface pattern.

[0010] In one embodiment of the present invention, the defect or foreign object identification of the mating surface pattern includes the steps of: detecting whether there is a connected region on the mating surface pattern that meets the set conditions; if it exists, then there is a defect or foreign object; if it does not exist, then there is no defect or foreign object.

[0011] In an embodiment of the present application, the step of obtaining the matching surface pattern of the hub bearing flange and the brake disc comprises the steps of: obtaining an initial picture, performing feature recognition on the initial picture to determine whether the hub bearing flange exists in the initial picture, and if so, extracting the matching surface pattern in the initial picture.

[0012] In an embodiment of the present application, the step of extracting the matching surface pattern in the initial picture comprises the steps of: performing gray scale processing on the initial picture, obtaining the center of the hub bearing flange, determining the contour range of the inner and outer circles of the matching surface based on the center, and performing binary processing to obtain the matching surface pattern.

[0013] In an embodiment of the present application, the method further comprises the step of: when the matching surface pattern has no defects or foreign matters, entering the next process.

[0014] The present application also provides a device for detecting the matching surface of the hub bearing flange and the brake disc, comprising: a pattern obtaining module, an identification module and an alarm module; wherein the pattern obtaining module is used for obtaining the matching surface pattern of the hub bearing flange and the brake disc; the identification module is used for identifying defects or foreign matters in the matching surface pattern; the image obtaining module and the identification module can be integrated in a processor. The alarm module is used for alarming when defects or foreign matters exist in the matching surface pattern; the alarm module comprises an alarm.

[0015] In an embodiment of the present application, the device for detecting the matching surface of the hub bearing flange and the brake disc further comprises: an automatic transport vehicle, a support, an image collector and a light source. The automatic transport vehicle is provided with a tooling table, and the tooling table is provided with a work station for fixing a workpiece, wherein the workpiece is the hub bearing flange, and when fixed, the matching surface of the hub bearing flange and the brake disc needs to be directed towards the image collector. The image collector, the light source, the alarm and the processor are respectively installed on the support. The image collector is used for collecting pictures of the hub bearing flange, the light source is used for providing light environment for image collection, the alarm is used for alarming, and the processor is used for performing pattern processing. The processor is electrically connected with the alarm and the image collector.

[0016] In an embodiment of the present application, the device for detecting the matching surface of the hub bearing flange and the brake disc further comprises: a display, which is arranged on the support and electrically connected with the processor. The display is used for displaying the matching surface pattern, so as to facilitate the staff to monitor the detection result.

[0017] In an embodiment of the present application, the automatic transport vehicle is provided with at least one tooling table, and the device for detecting the flange of the hub bearing and the mating surface of the brake disc comprises at least one bracket, at least one image collector and a plurality of light sources, the number of the brackets, the number of the image collectors and the number of the light sources are consistent with the number of the tooling tables.

[0018] In an embodiment of the present application, the automatic transport vehicle is an AGV.

[0019] In an embodiment of the present application, the bracket is provided with a mounting rack, and the image collector and the light source are respectively mounted in the mounting rack, and the light source is located below the image collector.

[0020] The method for detecting the flange of the hub bearing and the mating surface of the brake disc can obtain the mating surface pattern of the flange of the hub bearing and the brake disc, and detect the foreign matter or defects on the mating surface to determine whether there are defects or foreign matters on the mating surface of the flange of the hub bearing and the brake disc, and if there are defects, an alarm is given for subsequent processing by the staff. The method can detect whether there are defects or foreign matters on the mating surface before the brake assembly is assembled. When there are defects or foreign matters, the defects are repaired or the foreign matters are cleaned before the brake assembly is assembled, so that the qualified rate of the end jump test of the brake assembly can be effectively ensured. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 The number distribution diagram of the jump amount in the 60 brake assembly end jump tests of the present application;

[0023] Figure 2 The flowchart of the method for detecting the flange of the hub bearing and the mating surface of the brake disc of the present application;

[0024] Figure 3 The structural block diagram of the device for detecting the flange of the hub bearing and the mating surface of the brake disc of the present application;

[0025] Figure 4 The structural schematic diagram of the device for detecting the flange of the hub bearing and the mating surface of the brake disc of the present application;

[0026] Figure 5 The enlarged schematic diagram of the A area in the present application; Figure 4 ​

[0027] Figure 6 The mating surface pattern in the binary image when the invention has a defect or foreign matter;

[0028] Figure 7 The mating surface pattern in the binary image when the invention has a defect or foreign matter; Figure 6 The enlarged schematic view of the B area in the invention;

[0029] Figure 8 The mating surface pattern in the binary image when the invention has a defect or foreign matter.

[0030] Element number explanation

[0031] 100, automatic transport vehicle; 101, tooling table; 200, support; 201, mounting bracket; 300, image collector; 400, light source; 500, alarm module; 501, alarm; 600, processor; 601, pattern acquisition module; 602, identification module; 700, display; 800, hub bearing flange; 810, mating surface; 811, inner ring; 812, outer ring; 813, defect or foreign matter. DETAILED DESCRIPTION

[0032] The embodiments of the present application will be described herein below with reference to specific embodiments. Other advantages and effects of the present application, which can be easily understood by those skilled in the art, can be easily obtained from this description. The present application can also be implemented or applied in other different embodiments, and various modifications or changes can be made to the details in this description based on different views and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the present application are for describing specific embodiments, and are not intended to limit the protection scope of the present application. The test methods in the following embodiments are not specified, and are generally performed under conventional conditions or under the conditions recommended by the manufacturers.

[0033] It should be understood that the terms such as "up", "down", "left", "right", "middle", and "one" in this description are only for the convenience of clear description, and are not intended to limit the scope of the present application. Changes or adjustments of the relative relationship without substantial changes in the technical content are also considered as the scope of the present application.

[0034] Please refer to Figures 2 to 4 The present application provides a method for detecting the mating surface of a hub bearing flange and a brake disc, comprising the steps of:

[0035] The automatic transport vehicle 100 stops when moving to the lower position of the image collector 300, the image collector 300 takes a picture of the workbench, and sends the initial picture to the processor 600. The processor 600 acquires the initial picture, and performs feature recognition on the initial picture to determine whether the initial picture contains the hub bearing flange 800. The feature in the feature recognition refers to a round hole or a circle that meets the first set condition. In this step, because the hub bearing flange 800 is provided with a mounting hole, whether the initial picture contains the hub bearing flange 800 can be determined by identifying whether the initial picture contains a round hole or a circle that meets the first set condition. The first set condition can be a hole diameter range set by the flange mounting hole. The hole diameter range in the first set condition can be set and adjusted by the staff according to the actual hub bearing flange 800.

[0036] If the initial picture does not contain the hub bearing flange 800, the process is terminated, and the automatic transport vehicle 100 enters the next process.

[0037] Referring to Figures 5 to 8 , if the initial picture contains the hub bearing flange 800, the mating surface 810 pattern is extracted from the initial picture. The specific extraction process is as follows: the initial picture is subjected to gray scale processing, and the center position of the hub bearing flange 800 can be determined in the picture by recognizing the picture after gray scale processing. According to the center position of the hub bearing flange 800, the distance range between the inner circle 811 of the mating surface 810 and the center, and the distance range between the outer circle 812 of the mating surface 810 and the center, the contour range of the inner circle 811 and the outer circle 812 of the mating surface 810 is determined, the gray scale value of the image outside the contour range is set to 255 (i.e. white), and the contour range of the inner circle 811 and the outer circle 812 of the mating surface 810 is subjected to binaryzation processing: in the contour range, the gray scale value of the pixel point higher than the set threshold value is 255, and the gray scale value of the pixel point lower than the set threshold value is 0. A binaryzation image is obtained, which includes the mating surface pattern. In this embodiment, the black area in the binaryzation image is the mating surface 810 pattern (i.e. the area with a gray scale value of 0). In this step, the working principle of determining the center position of the hub bearing flange 800 is as follows: the outer contour or inner contour of the bearing flange is recognized, the outer contour or inner contour is a circle, and the center can be determined after recognizing the circle. The distance range between the inner circle 811 of the mating surface 810 and the center, and the distance range between the outer circle 812 of the mating surface 810 and the center are set by the staff according to the model of the hub bearing flange 800 and stored in the processor 600. The pixel point refers to the smallest unit that constitutes an image, which is an indivisible unit or element in the entire image.

[0038] The defect or foreign matter 813 on the matching surface 810 pattern is identified: whether there is a connected region meeting the second set condition on the matching surface 810 pattern, if there is, there is a defect or foreign matter 813, if not, there is no defect or foreign matter 813. The judgment basis of the connected region is whether there is a connected region meeting the second set condition in the matching surface 810 pattern (the black region in the figure). The second set condition can be whether the number of pixel points is within the set range, for example, the number of pixel points in the connected region is greater than or equal to A and less than or equal to B, A and B are positive integers. The specific identification process of the connected region is: the contour recognition is performed on the region in the contour range of the inner circle 811 and the outer circle 812 of the matching surface 810 in the binary image, and the connected region is obtained. For the connected region (for example Figure 6 ) in the binary image at the edge, since the detection range is within the contour range of the matching surface 810, the edge line of the contour (that is, the dashed part in the figure) is implied, so the defect at the edge is also a complete connected region, that is, this step can detect the defect at the edge, thereby ensuring the accuracy of the detection result. It should be noted that Figure 6 The dashed line in the figure is artificially added for easy understanding, and is not a real line in the binary image.

[0039] When the matching surface 810 pattern has a defect or foreign matter 813, an alarm is given. The workers will perform subsequent processing (such as defect repair or foreign matter removal) according to the alarm information. When the matching surface 810 pattern has no defect or foreign matter 813, the next process (such as assembly with the brake disc) is entered.

[0040] The method for detecting the matching surface 810 of the hub bearing flange 800 and the brake disc of the present application can detect whether there is a defect or foreign matter 813 on the matching surface 810 of the hub bearing flange 800 and the brake disc by obtaining the matching surface 810 pattern of the hub bearing flange 800 and the brake disc and detecting the defect or foreign matter 813 on the matching surface 810 pattern. If there is a defect, an alarm is given for subsequent processing by workers. This method can detect whether there is a defect or foreign matter on the matching surface 810 before the brake assembly is performed, thereby effectively ensuring the qualified rate of the end jump test after the brake assembly is completed.

[0041] Please refer to Figures 3 to 8The application further provides a device for detecting a flange of a hub bearing and a mating surface of a brake disc, comprising: a pattern acquisition module 601, an identification module 602, and an alarm module 500; wherein the pattern acquisition module 601 is configured to acquire a pattern of the mating surface of the flange of the hub bearing and the brake disc; the identification module 602 is configured to identify defects or foreign matters in the pattern; the pattern acquisition module 601 and the identification module 602 are integrated in a processor 600; and the alarm module 500 is configured to alarm when there are defects or foreign matters in the pattern; and the alarm module 500 comprises an alarm 501.

[0042] Please refer to Figures 4 to 8 In an embodiment of the application, the device for detecting the mating surface of the flange of the hub bearing and the brake disc further comprises: an automatic transport vehicle 100, a support 200, an image collector 300, and a light source 400; the automatic transport vehicle 100 is provided with a tooling table 100, the tooling table 100 is provided with a work station for fixing a workpiece, the workpiece is the flange 800 of the hub bearing, and when the flange 800 of the hub bearing is fixed, the mating surface 810 of the flange 800 of the hub bearing and the brake disc is directed towards the image collector 300; the image collector 300, the light source 400, the alarm 501, and the processor 600 are respectively installed on the support 200; the automatic transport vehicle 100 is configured to transport the hub bearing to be detected to below the image collector 300; the image collector 300 is configured to collect pictures of the flange 800 of the hub bearing; the light source 400 is configured to provide a light environment for image collection; the alarm 501 is configured to alarm; and the processor 600 is configured to perform pattern processing; and the processor 600 is electrically connected to the alarm 501 and the image collector 300.

[0043] In an embodiment of the application, the device for detecting the mating surface 810 of the flange 800 of the hub bearing and the brake disc further comprises: a display 700, which is provided on the support 200 and electrically connected to the processor 600; and the display 700 is a touch display screen, configured to display original pictures, binary images, detection results, and input related setting information, so as to facilitate a staff to manage and monitor the detection results.

[0044] In an embodiment of the present application, the automatic transport vehicle 100 is provided with at least one tooling table 100, and the device for detecting the hub bearing flange 800 and the brake disc mating surface 810 comprises at least one bracket 200, at least one image collector 300 and at least one light source 400. The number of tooling tables 100 can be multiple (for example, two), and the number of brackets 200, image collectors 300 and light sources 400 can be one. One image collector 300 detects by moving the hub bearing flange, for example, the right hub bearing is moved to the lower side of the image collector 300 for detection, and then the left hub bearing is moved to the lower side of the image collector 300 for detection.

[0045] In an embodiment of the present application, the number of brackets 200, the number of image collectors 300 and the number of light sources 400 are consistent with the number of tooling tables 100, for example, two. In this way, multiple images can be collected at the same time, and the work efficiency is improved.

[0046] In an embodiment of the present application, the bracket 200 is provided with a mounting bracket 201, and the image collector 300 and the light source 400 are respectively mounted in the mounting bracket 201, and the light source 400 is located below the image collector 300. The distance difference between the distance between adjacent two image collectors 300 and the distance between adjacent two hub bearings to be detected is within the range allowed by independent shooting, so as to avoid cross shooting and ensure the shooting effect.

[0047] In an embodiment of the present application, the automatic transport vehicle 100 is an AGV trolley, and the AGV trolley is provided with a power assembly and a control assembly. The control assembly can control the power assembly to move along the set route. The AGV trolley is also provided with a first detection device to detect whether it reaches the lower side of the image collector 300. The bracket 200 or the image collector 300 is provided with a second detection device to detect whether the tooling table 100 reaches the lower side of the image collector 300.

[0048] The image collector 300 can be an industrial camera. The light source 400 is a ring-shaped light source. The processor 600 can be a visual controller. The alarm 501 can be an audible and visual alarm. The industrial camera, the touch display screen, the alarm 501 and the visual controller are connected by a wire harness. The image information collected by the industrial camera is transmitted to the visual controller, and the visual controller displays the processed information on the display screen. If defects or foreign matters 813 are found on the hub bearing flange 800 and the brake disc mating surface 810, the alarm 501 will alarm. The ring-shaped light source, the visual controller and the touch display screen are powered by a 220V power supply, and the industrial camera and the alarm 501 are powered by the USB interface of the visual controller.

[0049] The mounting structure of the device for detecting the hub bearing flange 800 and the brake disc mating surface 810 is as shown in the figure Figure 3 As shown in the device structure diagram, the industrial camera, the annular light source, the touch display screen, the alarm 501, and the visual controller are fixed on the mounting bracket 200, and the mounting bracket 200 is fixed on the ground. The visual controller can control two industrial cameras at the same time. The left front hub bearing and the right front hub bearing are placed in the fixed tooling of the tooling table 100, and the tooling table 100 is fixed on the AGV trolley.

[0050] The working process of the device for detecting the hub bearing flange 800 and the brake disc mating surface 810 is as follows: when the AGV trolley fixed with the tooling table 100 stops running at the lower end of the industrial camera, the two industrial cameras take pictures of the positions of the left and right hub bearings placed on the tooling table 100, respectively. The pictures are transmitted to the visual controller, which analyzes the pictures and identifies the presence of the hub bearing flange 800 on the tooling table 100. If no bearing flange is present, the picture processing work will be stopped. After identifying the presence of the bearing flange on the tooling table 100, the visual controller processes the image, extracts the hub bearing and the brake disc mating surface 810, and identifies defects and foreign matter on the mating surface 810. If no defects and foreign matter are identified, the tooling table 100 is moved to the next station. If defects and foreign matter are identified, the tooling table 100 stops running and an audible and visual alarm is sounded. The position of the defect is displayed on the touch screen display 700, indicating the presence of the defect. The operator adjusts the hub bearing mating surface 810 according to the prompt, and after the adjustment is completed, the mating surface 810 is re-identified for defects. If no defects are found, the tooling table 100 is moved to the next station for the next process.

[0051] In the brake assembly end face run-out test, the main causes of run-out exceeding the tolerance are foreign matter on the hub bearing and brake disc mating surface 810, rust or scratches on the mounting surface. The present application identifies the defects and foreign matter on the bearing and brake disc mating surface 810 before the assembly of the brake assembly, and alarms if defects or foreign matter 813 are detected. The operator adjusts it. By identifying the defects and foreign matter on the hub bearing flange 800 and the brake disc mating surface 810 before the assembly of the hub bearing and the brake disc, the assembly run-out exceeding the tolerance caused by defects and foreign matter after the assembly of the brake disc is avoided. This method has the advantages of low cost and small space occupation, and avoids the problem of rework and disassembly of the brake disc and hub bearing for defect and foreign matter inspection after the occurrence of run-out exceeding the tolerance. Therefore, the present application effectively overcomes some practical problems in the prior art, thereby having high utilization value and use significance.

[0052] The above embodiments are only illustrative of the principles of the present application and its efficacy, and are not intended to limit the present application. Any modification or change made by any person skilled in the art without departing from the spirit and scope of the present application shall be covered by the claims of the present application.

Claims

1. A method of detecting the fit of a hub bearing flange to a brake disc mating surface, characterized by, The method comprises the steps of: acquiring a matching surface pattern of a hub bearing flange and a brake disc; identifying defects or foreign matters in the matching surface pattern; warning when defects or foreign matters exist in the matching surface pattern; wherein the step of acquiring the matching surface pattern of the hub bearing flange and the brake disc comprises the steps of acquiring an initial picture, identifying features in the initial picture to determine whether the hub bearing flange exists in the initial picture, and extracting the matching surface pattern in the initial picture if the hub bearing flange exists; the features in the feature identification refer to round holes or circles that meet a first set condition; the first set condition is a hole diameter range set through a flange mounting hole; the step of extracting the matching surface pattern in the initial picture comprises the steps of performing gray scale processing on the initial picture, acquiring a center of the hub bearing flange, determining contour ranges of inner and outer circles of the matching surface based on the center, and performing binary processing to obtain the matching surface pattern.

2. The method of claim 1, wherein, The step of identifying defects or foreign matters in the matching surface pattern comprises the steps of detecting whether a connected region that meets a set condition exists on the matching surface pattern, and determining that defects or foreign matters exist if the connected region exists, and determining that defects or foreign matters do not exist if the connected region does not exist.

3. The method of claim 1, wherein, The method further comprises the step of entering a next process when the matching surface pattern does not have defects or foreign matters.

4. A device for detecting the fit of a hub bearing flange to a brake disc mating surface, characterized by, The method comprises the steps of: a pattern acquisition module for acquiring a matching surface pattern of a hub bearing flange and a brake disc; an identification module for identifying defects or foreign matters in the matching surface pattern; a warning module for warning when defects or foreign matters exist in the matching surface pattern; wherein the step of acquiring the matching surface pattern of the hub bearing flange and the brake disc comprises the steps of acquiring an initial picture, identifying features in the initial picture to determine whether the hub bearing flange exists in the initial picture, and extracting the matching surface pattern in the initial picture if the hub bearing flange exists; the features in the feature identification refer to round holes or circles that meet a first set condition; the first set condition is a hole diameter range set through a flange mounting hole; the step of extracting the matching surface pattern in the initial picture comprises the steps of performing gray scale processing on the initial picture, acquiring a center of the hub bearing flange, determining contour ranges of inner and outer circles of the matching surface based on the center, and performing binary processing to obtain the matching surface pattern.

5. The apparatus of claim 4, wherein, The method further comprises the steps of: an automatic transport vehicle, wherein a tooling table is arranged on the automatic transport vehicle, and a work station for fixing a workpiece is arranged on the tooling table.

6. The apparatus of claim 4, wherein, The method further comprises the steps of: an image collector for image acquisition.

7. The apparatus of claim 4, wherein, The method further comprises the steps of: a light source for providing a light environment during image acquisition.

8. The apparatus of claim 7, wherein, The method further comprises the steps of: a bracket, wherein the light source is arranged on the bracket.

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