Vehicle body door cover piece coating deformation measuring method

Abstract

The embodiment of the invention provides a vehicle body door cover piece coating deformation measurement method, relates to the technical field of vehicle manufacturing, and has the main conception that a door cover piece is integrated with a vehicle body and then is subjected to coating and subsequent measurement links, so that the measurement process is simplified, and the deformation influence caused by transportation and man-made factors is effectively avoided. Meanwhile, accurate quantized data of a complete size can be obtained; besides, fitting points are selected in a stable area on the vehicle body for data fitting, that is, other stable areas except the door cover part on the vehicle body are adopted for fitting data before and after coating, the deformation influence of the door cover part can be eliminated, and the analysis result of comparing the size difference before and after coating is more accurate; and finally, on the basis of a coating deformation result of the door cover piece, correlation analysis is performed on area data of matched parts on the vehicle body, so that the installation, adjustment and standard correction of the door cover piece and related parts thereof can be reliably and quantitatively guided.

Description

[Technical field]

[0001] The embodiments of the present application relate to the field of vehicle manufacturing technology, and in particular to a method for measuring the deformation of a vehicle body door cover during painting. [Background technology]

[0002] At present, in the process of size matching of door cover parts such as engine hoods, it is found that the door cover that is installed on the body and meets the white body inspection standards often has a matching state inconsistent with the body matching state after entering the final assembly. The conventional problem analysis idea is to find the impact of the final assembly parts on the door cover or the impact of assembly operations and processes, while ignoring the impact of the painting process on the size of the door cover parts. [Summary of the invention]

[0003] The embodiment of the present application proposes a method for measuring the deformation of a vehicle body door cover during painting, which relates to the field of vehicle manufacturing technology. The present application can take into account the influence of the painting process on the deformation of the vehicle body door cover, and provide a method for measuring the deformation before and after painting. It can also be used to guide the installation and adjustment of the vehicle body door cover.

[0004] The present application provides a method for measuring deformation of a vehicle body door cover during painting, the method comprising:

[0005] Fix the position of the door cover to be tested on the assembled and adjusted vehicle body in white;

[0006] Scanning the outer surface area of ​​the door cover and the parts associated with it to obtain first scanning data;

[0007] After the vehicle body is painted, the outer surface area of ​​the door cover and the parts associated with it are scanned again to obtain second scanning data;

[0008] Selecting several points in the same preset stable area on the vehicle body in the two scanning data respectively, and performing data fitting;

[0009] According to the fitting results, the deformation of the door cover before and after painting is measured and compared;

[0010] The vehicle body adjustment standard is updated based on the deformation amount.

[0011] In at least one possible implementation manner, the deformation measurement method further includes:

[0012] Before painting, the assembly reference value at the preset position between the door cover and the associated matching parts is measured;

[0013] After painting, check whether the size of the preset position meets the assembly reference value, and scan after confirming that the check is correct.

[0014] In at least one possible implementation manner, the deformation measurement method further includes: after painting and before the second scanning, fixing the position of the door cover again.

[0015] In at least one possible implementation, the deformation measurement method further includes: measuring and comparing the deformation of components associated with the door cover before and after painting based on the fitting result.

[0016] In at least one possible implementation, updating the vehicle body adjustment standard based on the deformation includes: correcting the vehicle body section difference adjustment benchmark at the assembly position of the door cover component and the component based on the difference in deformation between the door cover component and the component.

[0017] In at least one possible implementation, the selection range of the site covers the X-axis direction, Y-axis direction, and Z-axis direction of the vehicle body.

[0018] In at least one possible implementation, the locations are selected symmetrically on the left and right sides of the vehicle body.

[0019] In at least one possible implementation, the data fitting includes: setting a fitting standard, and if the fitting result does not meet the fitting standard, re-changing a number of the sites and fitting again.

[0020] In at least one possible implementation manner, performing data fitting further includes: using the fitting data to create a colored vehicle body door cover graphic to obtain a measurement diagram.

[0021] In at least one possible implementation, a plurality of measuring points for measuring deformation are provided on the vehicle body door cover figure in the measurement diagram.

[0022] The technical effects of the above scheme can be referenced as follows: after the door cover parts are integrated into the body, they are subjected to painting and subsequent measurement steps together, which simplifies the measurement process and effectively avoids the deformation caused by transportation and human factors, while obtaining accurate quantitative data of the complete size; in addition, fitting points are selected in the stable area on the body for data fitting, that is, other stable areas on the body other than the door cover parts are used to fit the data before and after painting, which can eliminate the deformation influence of the door cover parts themselves, making the analysis results of the size difference before and after painting more accurate; finally, based on the painting deformation results of the door cover parts, correlation analysis is performed with the data of the matching parts area on the body, so as to reliably and quantitatively guide the installation and standard correction of the door cover parts and their related components.

Brief Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic flow chart of a method for measuring deformation of a vehicle body door cover during painting provided in an embodiment of the present application. [Specific implementation method]

[0025] In order to better understand the technical solution of this specification, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0026] It should be clear that the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this specification.

[0027] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit this specification. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0028] At present, there are at least the following problems in the measurement and analysis of coating deformation of conventional door covers such as engine hoods:

[0029] (1) Due to the particularity of the painting process, it is difficult to paint the door cover assembly alone. Special lifting equipment and tooling are required to complete the process. In addition, the painted parts need to be moved back to the inspection fixture for dimensional measurement. The process is complicated and increases the risk of part deformation during the process.

[0030] (2) If the door cover is painted along with the body, the door cover assembly must be removed from the body first, and the circumference of the part must be measured using a gauge. After completion, the door cover is installed back on the body and placed in the painting process along with the body. After leaving the paint shop, the door cover assembly is removed from the body and the gauge measurement is repeated. This process is complex and inefficient, with the risk of human-caused deformation, and requires manual comparison and analysis of the measurement results.

[0031] (3) The dimensional deformation of the coating is difficult to quantify, the inspection fixture cannot measure the full size, and the deformation of the middle area of ​​the part cannot be known. Conventional inspection fixture measurement and analysis methods are difficult to obtain accurate and complete results and are inefficient.

[0032] (4) In addition, the measurement results are difficult to correlate with data from other areas on the vehicle body, and cannot provide intuitive guidance for vehicle body assembly and adjustment.

[0033] In view of this, an embodiment of the present application provides a method for measuring the painting deformation of a vehicle body door cover, in which the door cover is integrated into the vehicle body and then undergoes painting and subsequent measurement steps together, which is convenient for simplifying the measurement process and effectively avoiding the influence of deformation caused by transportation and human factors, while being able to obtain accurate quantitative data of the complete size; in addition, fitting points are selected in a stable area on the vehicle body for data fitting, that is, other stable areas on the vehicle body other than the door cover are used to fit the data before and after painting, which can eliminate the deformation influence of the door cover itself, and make the analysis results of comparing the size differences before and after painting more accurate; finally, based on the painting deformation results of the door cover, a correlation analysis is performed with the data of the matching component area on the vehicle body, so as to reliably and quantitatively guide the installation and adjustment of the door cover and its related components as well as the standard correction.

[0034] The technical solution protected by the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0035] See also Figure 1 , is a schematic diagram of a process flow of a method for measuring deformation of a vehicle body door cover coating provided in an embodiment of the present application. The process flow of the method is described as follows:

[0036] Step 101: Positioning the door cover to be tested on the assembled and adjusted body-in-white.

[0037] This embodiment takes the matching of the engine hood and the fender as an example. Specifically, in this step, the engine hood position can be fixed by using the engine hood front installation tool (located at the upper curved beam) on the body that has been assembled and adjusted in the body shop, and the gap between the engine hood and the front end of the fender at 30mm is measured by using a gap gauge while ensuring the fixed and stable state, and the assembly reference value at this position is recorded. That is, here, the parts that match with the door cover parts are used, and the assembly reference value at the preset position between the door cover parts and the associated matching parts before painting is measured in advance.

[0038] Step 102: Scan the entire surface area of ​​the door cover and its associated and matched parts to obtain first scanning data.

[0039] Specifically, the measuring equipment can be used to scan the entire outer surface area of ​​the engine hood, especially the contour, which requires relatively detailed data collection to ensure more completeness. During the scanning process, the upper / front end of the fender that matches the engine hood, as well as the upper mounting plate on the body, the lower part of the A-pillar and other related parts with good rigidity and relatively stable areas can also be synchronously scanned and measured to obtain relevant data on the features of the matching parts around the engine hood.

[0040] Step 103: After the vehicle body is painted, the door cover is positioned again, and the complete surface area of ​​the door cover and its associated parts is scanned again to obtain second scanning data.

[0041] Specifically, the vehicle body is painted according to the process flow, and then the upper curved beam is installed (the upper curved beam needs to be removed before painting) and the engine hood can be fixed again using the aforementioned installation tool, and then the scanning operation is repeated to collect data of the engine hood (and its surrounding related parts) after painting. In addition, in combination with the embodiment of measuring the reference value before painting mentioned in the above example, it is also possible to verify whether the preset position meets the pre-measured assembly reference value after positioning, and scan again after confirming that the verification is correct.

[0042] It can be added here that if the upper curved beam and the installation tools on it are not used to perform the fixing operation, the gap value at the 30mm position between the hood and the front end of the fender can be adjusted manually to achieve the body measurement value before painting. Then, the position of the hood can be fixed with auxiliary tools, and then a scanning operation can be performed to collect data of the hood (and its surrounding related parts) after painting.

[0043] Step 104: In the two scan data, several sites in the preset stable area on the vehicle body are selected to fit the data before and after painting.

[0044] In actual operation, several sites in the preset stable area on the car body can be selected as target points from the two scanning data. The analysis idea provided in this application is to compare part data with part data, rather than comparing part data with theoretical data; and, instead of fitting the characteristics of the engine hood parts themselves, the relatively stable area on the car body is used as a reference for comparison before and after the painting process. In this way, by comparing these stable areas in the subsequent links, the deformation of the engine hood before and after painting can be evaluated, and the deformation comparison process can also be preferably displayed using color pictures.

[0045] Continuing from the above, in this embodiment, the target points can all be located in the stable area of ​​the vehicle body around the fender and the engine hood (rather than on the fender and the engine hood). It can be understood that when selecting stable target points, several sites in the area that is less affected by the painting process are considered, which can ensure the reliability of the comparison data. In addition, preferably, the selection of target points can cover the three-dimensional XYZ directions of the vehicle body, and the points can be symmetrically arranged on the left and right sides of the vehicle body.

[0046] The target points are used to fit the data before and after painting and create a visual measurement diagram of the engine hood. Several measurement points can be arranged on the surface of the peripheral surface difference of the engine hood in the measurement diagram to quantify the deformation of the engine hood. On the one hand, evaluation criteria can be set in actual operation. For example, if the fitting result is within 0.1mm, it can be considered that the fit is good and the target point selection is relatively reasonable; if the fitting result is greater than 0.2, the rationality of the target point selection is evaluated, and the target point can be changed again if necessary. On the other hand, it is preferably created as a color map so that the deformation of each position of the engine hood can be more intuitively displayed.

[0047] Step 105: Based on the fitting results, the deformation amounts of the door cover and its associated parts before and after painting are compared.

[0048] The deformation of the corresponding positions of the hood and fender before and after painting can be compared and measured through the above-mentioned visual measurement diagram. For example, since the preset reference positions A and B have been adjusted according to the established white body inspection standards during the body assembly, after the painting process, if the deformation of the hood is greater than the deformation of the fender, it will be manifested that the surface difference between the hood and the fender no longer meets the above-mentioned white body inspection standards.

[0049] Step 106: Correct the vehicle body adjustment standard based on the deformation amount.

[0050] Finally, taking the previous example as an example, the body section difference adjustment reference of the matching position of the hood and the fender can be corrected based on the difference in the paint deformation at the corresponding positions of the hood and the fender (hood deformation a, fender deformation b, and the deformation difference is ab). In this embodiment, the deformation difference can be reversely superimposed on the original reference (for example, if the original reference is 0 section difference, then according to the deformation measured by the above analysis, the adjustment reference can be corrected to the hood being 0+ab lower than the fender). Of course, those skilled in the art can understand that the above is only a schematic introduction and explanation, and not a limitation.

[0051] That is, the above standard method for correcting the body assembly adjustment based on the difference in paint deformation at the corresponding positions of the engine hood and fenders does not limit specific parts and specific differences, but only provides a method for on-site improvement as an auxiliary means to solve the problem mentioned above that there is a difference between the performance of the door cover perimeter and the performance of the body. Accordingly, the present application can also be applied to the measurement and data fitting, adjustment application of paint deformation of the tailgate, side door, etc., which is slightly different from the engine hood example in the previous article. For example, when measuring the side door, the suction block is mainly used to fix the side door: the rear side door suction block can be adsorbed on the side outer panel, and the front side door suction block can be adsorbed on the rear side door. This application will not go into details.

[0052] The above description is only a preferred embodiment of this specification and is not intended to limit this specification. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this specification should be included in the scope of protection of this specification.

Claims

1. A method for measuring deformation of a vehicle body door cover during painting, characterized in that: The method comprises: Fix the position of the door cover to be tested on the assembled and adjusted vehicle body in white; Scanning the outer surface area of ​​the door cover and the parts associated with it to obtain first scanning data; After the vehicle body is painted, the outer surface area of ​​the door cover and the parts associated with it are scanned again to obtain second scanning data; Selecting several points in the same preset stable area on the vehicle body in the two scanning data respectively, and performing data fitting; According to the fitting results, the deformation of the door cover before and after painting is measured and compared; The vehicle body adjustment standard is updated based on the deformation amount.

2. The method for measuring deformation of a vehicle body door cover during painting according to claim 1, characterized in that: The deformation measurement method further comprises: Before painting, the assembly reference value at the preset position between the door cover and the associated matching parts is measured; After painting, check whether the size of the preset position meets the assembly reference value, and scan after confirming that the check is correct.

3. The method for measuring deformation of a vehicle body door cover during painting according to claim 2, characterized in that: The deformation measurement method further includes: fixing the position of the door cover again after painting and before the second scanning.

4. The method for measuring deformation of a vehicle body door cover during painting according to claim 1, characterized in that: The deformation measurement method further includes: measuring and comparing the deformation amounts of the components associated with the door cover before and after painting according to the fitting results.

5. The method for measuring deformation of a vehicle body door cover during painting according to claim 4, characterized in that: The updating of the vehicle body adjustment standard based on the deformation includes: correcting the vehicle body section difference adjustment benchmark at the assembly position of the door cover component and the component based on the difference in deformation between the door cover component and the component.

6. The method for measuring deformation of a vehicle body door cover during painting according to claim 1, characterized in that: The selection range of the site covers the X-axis direction, the Y-axis direction, and the Z-axis direction of the vehicle body.

7. The method for measuring deformation of a vehicle body door cover during painting according to claim 6, characterized in that: The locations are selected symmetrically on the left and right sides of the vehicle body.

8. The method for measuring deformation of a vehicle body door cover during painting according to any one of claims 1 to 7, characterized in that: The data fitting comprises: setting a fitting standard, and if the fitting result does not meet the fitting standard, re-changing a number of the sites and fitting again.

9. The method for measuring deformation of a vehicle body door cover during painting according to any one of claims 1 to 7, characterized in that: The data fitting also includes: using the fitting data to create a colored vehicle body door cover figure to obtain a measurement figure.

10. The method for measuring deformation of a vehicle body door cover during painting according to claim 9, characterized in that: A plurality of measuring points for measuring deformation are arranged on the vehicle body door cover figure in the measurement diagram.

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