Method and device for detecting coating range of vehicle body material

Abstract

The invention discloses a vehicle body material coating range detection method and device, and the method comprises the steps: selecting a standard vehicle body according to a coating parameter, and the standard vehicle body comprises a coating region corresponding to the coating parameter; selecting a calibration object on the standard vehicle body according to the coating area, wherein the calibration object is used for identifying the coating area; collecting images of the coating area and the calibration object to generate a standard image; preparing a projection card according to the standard image, wherein the projection card comprises a standard area corresponding to the coating area and a calibration area corresponding to the calibration object; and projecting the projection card on a to-be-measured vehicle body by using a handheld slide projector, so that the projection of the calibration area is aligned with a calibration object of the to-be-measured vehicle body, and evaluating the material coating range of the to-be-measured vehicle body according to the projection of the standard area.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle body material coating quality detection, and in particular to a vehicle body material coating range detection method and device. Background Art

[0002] The materials used to coat the vehicle body include paint, PVC glue, LASD (liquid spray sound insulation material), shock-absorbing gaskets, etc. Excessive coating of materials will lead to waste and affect the subsequent assembly process (causing interference), while too little coating will fail to meet the corresponding functional requirements such as anti-corrosion, sealing, and shock absorption.

[0003] One of the job responsibilities of a quality engineer is to conduct random inspections and evaluations on the coating range of vehicle body materials. The usual practice is for the reviewer to compare the actual vehicle coating status with the drawings and make a subjective evaluation of the deviation between the vehicle body status to be inspected and the requirements of the drawings. This practice is time-consuming, and the evaluation results are subjective and cannot be quantified.

[0004] In the existing technology, one method is to use a visual recognition system to evaluate the coating range of the vehicle body material. The disadvantages include: high equipment investment costs; professional personnel are required to program and debug for different vehicle models and different vehicle body positions; work can only be carried out at fixed workstations, which is inconvenient and therefore cannot be checked anywhere. Another method is for the reviewer to compare the actual vehicle coating status with the drawings and conduct a subjective evaluation. The disadvantages include that the reviewer needs to compare the vehicle body status with the drawing requirements one by one, which is inefficient; it is a subjective evaluation, the evaluation results cannot be quantified, and there are differences in the evaluation results of different reviewers; the evaluation results cannot be compared with the previous vehicle body status. Summary of the invention

[0005] To solve at least one aspect of the above problems, the present invention provides a method for detecting the coating range of vehicle body materials, comprising: selecting a standard vehicle body according to coating parameters, the standard vehicle body including a coating area corresponding to the coating parameters; selecting a calibration object on the standard vehicle body according to the coating area, the calibration object being used to identify the coating area; acquiring images of the coating area and the calibration object to generate a standard image; preparing a projection card according to the standard image, the projection card including a standard area corresponding to the coating area and a calibration area corresponding to the calibration object; using a handheld projector to project the projection card onto a vehicle body to be tested, so that the projection of the calibration area is aligned with the calibration object of the vehicle body to be tested, and evaluating the material coating range of the vehicle body to be tested according to the projection of the standard area.

[0006] Preferably, the step of preparing a projection card according to the standard image comprises: extracting the contours of the coating area and the calibration object according to the standard image to generate a template image; and printing the template image on a projection film to obtain the projection card.

[0007] Preferably, the template image further includes a deviation qualified outline and a non-qualified outline, the projection card includes a deviation qualified area and a non-qualified area, and the standard area, the deviation qualified area and the non-qualified area correspond to different colors respectively.

[0008] Preferably, the template image further includes a warning outline, and the projection card includes a warning area, and the warning area is used to indicate an area that is prone to contamination during coating.

[0009] Preferably, the calibration object includes at least three calibration points, and the calibration points are studs or mounting holes adjacent to the standard coating range.

[0010] Preferably, the handheld projector includes a handheld bracket, a light source and a lens assembly, the handheld bracket includes a light source mounting part, a card mounting part and a lens mounting part; the light source is fixedly connected to the handheld bracket through the light source mounting part; the lens assembly is fixedly connected to the handheld bracket through the lens mounting part, and the card mounting part is used to snap the projection card.

[0011] On the other hand, a vehicle body material coating range detection device is provided, comprising a handheld bracket, a light source, a lens assembly and a projection card, the handheld bracket comprising a light source mounting portion, a card mounting portion and a lens mounting portion; the light source is fixedly connected to the handheld bracket via the light source mounting portion; the lens assembly is fixedly connected to the handheld bracket via the lens mounting portion, the card mounting portion is used to buckle the projection card, the projection card comprises a standard area and a calibration area, a standard vehicle body is selected according to coating parameters, the standard vehicle body comprises a coating area corresponding to the coating parameters, a calibration object is selected on the standard vehicle body according to the coating area, the calibration object is used to identify the coating area, images of the coating area and the calibration object are collected to generate a standard image, contours of the coating area and the calibration object are extracted according to the standard image to generate a template image, the template image is printed on a projection film to obtain the projection card, the projection card comprises a standard area corresponding to the coating area, and a calibration area corresponding to the calibration object.

[0012] The vehicle body material coating range detection method and device of the present invention have the following beneficial effects: no equipment investment is required, the handheld slide projector is easy to operate, and the slides can be printed using an ordinary printer; after simple training, standard templates can be made for different vehicle models and different vehicle body positions, and the applicability is strong; the standard vehicle body state and the deviation qualified state are directly projected onto the vehicle body to be inspected, which significantly improves the accuracy of comparison; the evaluation efficiency is improved, and the consistency of evaluation by different assessors is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to better understand the above and other purposes, features, advantages and functions of the present invention, reference may be made to the embodiments shown in the accompanying drawings. The same reference numerals in the accompanying drawings refer to the same components. It should be understood by those skilled in the art that the accompanying drawings are intended to schematically illustrate the preferred embodiments of the present invention and have no limiting effect on the scope of the present invention, and the components in the drawings are not drawn to scale.

[0014] Figure 1 A schematic diagram showing a flow chart of a method for detecting a coating range of a vehicle body material according to an embodiment of the present invention is shown;

[0015] Figure 2 A schematic structural diagram of a vehicle body material coating range detection device according to an embodiment of the present invention is shown.

[0016] Reference numerals:

[0017] 10. Handheld bracket; 11. Light source mounting portion; 121. First lens mounting portion; 122. Second lens mounting portion; 13. Card mounting portion; 20. Light source; 31. First convex lens; 32. Second convex lens; 40. Projection card; 41. Standard area; 42. Calibration area. DETAILED DESCRIPTION

[0018] The following is a description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, including various details of the embodiments of the present disclosure to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0019] As used herein, the term "including" and its variations mean open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "based at least in part on". The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc. may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0020] In order to at least partially solve one or more of the above-mentioned problems and other potential problems, an embodiment of the present disclosure proposes a method for detecting the coating range of a vehicle body material, comprising: selecting a standard vehicle body according to coating parameters, the standard vehicle body including a coating area corresponding to the coating parameters; selecting a calibration object on the standard vehicle body according to the coating area, the calibration object being used to identify the coating area; collecting images of the coating area and the calibration object to generate a standard image; preparing a projection card according to the standard image, the projection card including a standard area corresponding to the coating area, and a calibration area corresponding to the calibration object; using a handheld projector to project the projection card onto the vehicle body to be tested, so that the projection of the calibration area is aligned with the calibration object of the vehicle body to be tested, and evaluating the material coating range of the vehicle body to be tested based on the projection of the standard area.

[0021] Specifically, Figure 1 As shown, the coating parameters are obtained through the design drawings, and the coating parameters include dimensions and reference positions. For example, the length, width and reference position of the material coating range are 290m in length and 70mm in width. The reference position includes the bottom edge being flush with welding point 1 along the z-axis direction and the lower right corner being flush with welding point 2 in the x-direction, or the reference position includes the bottom edge being parallel to the sheet metal welding edge. Or in another embodiment, the material coating range dimensions also include the diameter, the center of the circle and the reference position, or the material coating range also includes the side length and the reference position of the polygon. According to the coating parameters, the body whose coating area meets the parameters defined is selected as the standard body.

[0022] The calibration object is selected on the standard vehicle body according to the coating area. The calibration object is selected from the studs, holes or mounting surfaces around the coating area. The calibration object is a reference object fixed relative to the coating area on the standard vehicle body. The coating area can be calibrated by the fixed distance of the calibration object relative to the coating area.

[0023] The image of the coating area and the calibration object is captured by a camera to obtain a standard image including the coating area and the calibration object. The outline of the coating area on the standard image should be clearly visible and cover the calibration objects in the vicinity of the coating area. In some embodiments, the image of the coating area and the calibration object of the standard vehicle body is captured according to a preset angle to generate a standard image. The preset angle can be set according to the specific needs of the detection.

[0024] Prepare a projection card based on the standard image, so that the relative position and relative size of the standard area and the calibration area on the projection card are consistent with the relative position and relative size of the coating area and the calibration object in the standard image. Avoid rotating the standard image when processing it in the process of preparing the projection card based on the standard image to maintain the original viewing angle when taking the photo.

[0025] Place the prepared projection card on a handheld projector, and place the projection card between the light source and the lens assembly, so that when the light source is turned on, the standard area and the calibration area on the lens card are projected onto the vehicle body to be tested. The position and angle of the projection card are corrected by the one-to-one correspondence between the calibration area and the calibration object on the vehicle body to be tested, and then compare the projection of the standard area on the vehicle body to be tested with the coating range to be tested on the vehicle body to be tested. For example, in some embodiments, when the coating range to be tested exceeds the projection of the standard area, the coating of the vehicle body to be tested is judged to be unqualified; when the projection of the standard area exceeds the coating range to be tested, the coating of the vehicle body to be tested is judged to be unqualified; when the projection of the standard area coincides with the coating range to be tested, the coating of the vehicle body to be tested is judged to be qualified.

[0026] In some embodiments, the step of preparing a projection card according to a standard image includes: extracting the contours of a coating area and a calibration object according to the standard image to generate a template image, and printing the template image on a projection film to obtain a projection card.

[0027] Specifically, it also includes filling the coated area of ​​the template image and the outline of the calibration object with color, then printing the template image filled with color on a transparent projection film, and cutting the projection film into a size suitable for a handheld slide projector to form a projection card. In other embodiments, the standard image also includes multiple coated areas, the corresponding extracted template image includes the outlines of the multiple coated areas, and the generated projection card includes the standard areas corresponding to the multiple coated areas.

[0028] In some embodiments, the template image further includes a deviation qualified outline and a non-qualified outline, the projection card includes a deviation qualified area and a non-qualified area, and the standard area, the deviation qualified area and the non-qualified area correspond to different colors respectively.

[0029] Specifically, the template image includes information such as the standard area of ​​the standard vehicle body, the qualified deviation area, the unqualified area, and the calibration area. An optional marking method: the coating range of the standard area is indicated by a green outline, the qualified deviation area is indicated by a yellow outline, the unqualified area is indicated by a red outline, and the positioning point is indicated by a green dot.

[0030] A homemade handheld slide projector is used to project the projection card onto the vehicle to be inspected, and the coating area of ​​the standard vehicle body is located at the corresponding position of the vehicle to be inspected with the help of the calibration area, and then the coating state of the vehicle to be inspected is evaluated based on the coating range marks of the standard area, qualified deviation area and unqualified area. For example, when the coating area of ​​the vehicle to be inspected coincides with the standard area, the vehicle to be inspected is judged to be qualified; when the coating area of ​​the vehicle to be inspected exceeds the standard area and is less than or equal to the qualified deviation area, the vehicle to be inspected is judged to be qualified in deviation; when the coating area of ​​the vehicle to be inspected exceeds the qualified deviation area and reaches the unqualified area, the vehicle to be inspected is judged to be unqualified.

[0031] In some embodiments, the template image further includes a warning outline, and the projection card includes a warning area, and the warning area is used to prompt coating of an area that is prone to contamination.

[0032] Specifically, the coating area is the area covered by the coating material. Since the vehicle body structure is not a completely planar structure, it is easy to leave contamination traces of the coating material at other locations outside the coating area during the coating operation. By setting a warning contour, the area where contamination traces often appear can be marked with a warning contour.

[0033] In some embodiments, the calibration object includes at least three calibration points, and the calibration points are studs or mounting holes adjacent to the standard coating range.

[0034] Specifically, Figure 2 As shown, when the three calibration points in the calibration object are projected onto the vehicle body to be tested, the positions of the three calibration points correspond to the response studs or holes on the vehicle body respectively, and then the projection of the standard area is compared with the coating range on the vehicle body to be tested.

[0035] In some embodiments, the handheld projector includes a handheld bracket 10, a light source 20 and a lens assembly, the handheld bracket 10 includes a light source mounting part 11, a card mounting part 13 and a lens mounting part; the light source 20 is fixedly connected to the handheld bracket 10 through the light source mounting part 11; the lens assembly is fixedly connected to the handheld bracket 10 through the lens mounting part, and the card mounting part 13 is used to snap on the projection card 40.

[0036] Specifically, the light source 20 is fixedly arranged on the handheld bracket 10, and the lens assembly includes a first convex lens 31 and a second convex lens 32. The focal lengths of the first convex lens 31 and the second convex lens 32 can be selected according to specific projection requirements. The corresponding lens mounting part includes a first lens mounting part 121 and a second lens mounting part 122. The distance between the first lens mounting part 121 and the second lens mounting part 122 is set according to the specific projection requirements based on the imaging principle of the lens assembly.

[0037] On the other hand, a vehicle body material coating range detection device is provided, including a handheld bracket 10, a light source 20, a lens assembly and a projection card 40, the handheld bracket 10 including a light source mounting portion 11, a card mounting portion 13 and a lens mounting portion, the light source 20 is fixedly connected to the handheld bracket 10 through the light source mounting portion 11, the lens assembly is fixedly connected to the handheld bracket 10 through the lens mounting portion, the card mounting portion 13 is used to snap on the projection card 40, the projection card 40 includes a standard area 41 and a calibration area 42, a standard vehicle body is selected according to the coating parameters, the standard vehicle body includes a coating area corresponding to the coating parameters, a calibration object is selected on the standard vehicle body according to the coating area, the calibration object is used to identify the coating area, images of the coating area and the calibration object are collected to generate a standard image, the contours of the coating area and the calibration object are extracted according to the standard image to generate a template image, the template image is printed on a projection film to obtain the projection card 40, the projection card 40 includes a standard area 41 corresponding to the coating area, and a calibration area 42 corresponding to the calibration object.

[0038] Specifically, Figure 2 As shown, the light source mounting part 11, the card mounting part 13 and the lens mounting part of the handheld bracket 10 are in a straight line, so that the light source 20, the projection card 40 and the lens assembly are in a straight line. In some embodiments, the lens mounting part includes a first lens mounting part 121 and a second lens mounting part 122, and the first lens mounting part 121 and the second lens mounting part 122 are respectively connected to the handheld bracket 10 in a detachable manner. For example, the bottom of the lens mounting part includes a buckle structure. When the buckle structure holds the handheld bracket 10, the lens mounting part is relatively fixed to the handheld bracket 10. When the buckle structure is opened, the lens mounting part can move relative to the handheld bracket 10. The buckle structure of the lens mounting part can meet the installation requirements of different lens assemblies. In some embodiments, the projection card 40 includes a plurality of sub-projection cards, each of which corresponds to a template image, and the plurality of sub-projection cards can be moved in the card mounting part 13 to realize the projection of the template image in each sub-projection card on the vehicle body to be tested. By setting a plurality of sub-projection cards, the coating range of multiple positions can be detected efficiently.

[0039] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the present invention.

Claims

1. A method for detecting the coating range of a vehicle body material, characterized in that: include: selecting a standard vehicle body according to the coating parameters, the standard vehicle body including a coating area corresponding to the coating parameters; Selecting a calibration object on the standard vehicle body according to the coating area, wherein the calibration object is used to identify the coating area; Acquiring images of the coating area and the calibration object to generate a standard image; Preparing a projection card according to the standard image, the projection card comprising a standard area corresponding to the coated area and a calibration area corresponding to the calibration object; The projection card is projected onto the vehicle body to be tested by using a handheld slide projector, so that the projection of the calibration area is aligned with the calibration object of the vehicle body to be tested, and the material coating range of the vehicle body to be tested is evaluated according to the projection of the standard area.

2. The method according to claim 1, characterized in that The step of preparing a projection card according to the standard image includes: extracting the contours of the coating area and the calibration object according to the standard image to generate a template image, and printing the template image on a projection film to obtain the projection card.

3. The method according to claim 2, characterized in that The template image further includes a deviation qualified outline and a non-qualified outline, the projection card includes a deviation qualified area and a non-qualified area, and the standard area, the deviation qualified area and the non-qualified area correspond to different colors respectively.

4. The method according to claim 3, characterized in that The template image also includes a warning outline, and the projection card includes a warning area, and the warning area is used to prompt the coating of the easily contaminated area.

5. The method according to claim 2, characterized in that: The calibration object includes at least three calibration points, and the calibration points are studs or mounting holes adjacent to the standard coating range.

6. The method according to claim 2, characterized in that The handheld projector includes a handheld bracket, a light source and a lens assembly, wherein the handheld bracket includes a light source mounting portion, a card mounting portion and a lens mounting portion; the light source is fixedly connected to the handheld bracket via the light source mounting portion; the lens assembly is fixedly connected to the handheld bracket via the lens mounting portion, and the card mounting portion is used to clip the projection card.

7. A vehicle body material coating range detection device, characterized in that: The invention comprises a handheld bracket, a light source, a lens assembly and a projection card, wherein the handheld bracket comprises a light source mounting part, a card mounting part and a lens mounting part, wherein the light source is fixedly connected to the handheld bracket through the light source mounting part, the lens assembly is fixedly connected to the handheld bracket through the lens mounting part, the card mounting part is used to buckle the projection card, the projection card comprises a standard area and a calibration area, a standard vehicle body is selected according to coating parameters, the standard vehicle body comprises a coating area corresponding to the coating parameters, a calibration object is selected on the standard vehicle body according to the coating area, the calibration object is used to identify the coating area, images of the coating area and the calibration object are collected to generate a standard image, contours of the coating area and the calibration object are extracted according to the standard image to generate a template image, the template image is printed on a projection film to obtain the projection card, the projection card comprises a standard area corresponding to the coating area, and a calibration area corresponding to the calibration object.

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