Automobile spraying quality inspection method

Abstract

The present invention provides a method for detecting the quality of automobile spray painting, which includes setting a first coating layer on the vehicle body; pasting a covering layer on a preset area on the first coating layer; setting a second coating layer on the vehicle body and the first coating layer, and curing the first coating layer and the second coating layer; removing the covering layer, detecting the material parameters of the preset area; comparing the material parameters with the preset material parameters, and generating a comparison result; judging whether the quality of the vehicle body spray painting is qualified according to the comparison result. The technical solution of the present invention performs detection at the position where the two coating layers are connected, that is, detecting the material parameters of the preset area, and judging the materials used in the current production process according to the material parameters, whether a reaction will occur during processing to cause a change in the final material, and whether the production requirements are still met after the change, thereby ensuring the qualified quality of automobile spray painting and eliminating the quality and safety hazards of the automobile.

Description

Technical Field

[0001] The invention relates to the technical field of automobile manufacturing, and in particular to a method for detecting automobile spraying quality. Background Art

[0002] In recent years, with the development of the automobile industry, the competition in the automobile market has become increasingly fierce. In today's increasingly fierce market competition, in order to enhance the competitiveness of products, major OEMs continue to adopt new processes and appearances to highlight the characteristics of their products. Among them, multi-color body is a product shape that has appeared in recent years, and some models have two colors on the windshield installation surface.

[0003] However, this two-color coating will also cause some problems that have never occurred in traditional production processes or are more complicated, such as the problem that the glass glue is easy to peel off from the painted body side, especially when the glass glue covers the color interface. This problem is particularly obvious. Since the glass glue is used to stick to the windshield, the windshield not only protects the car from wind and rain and transmits light, but is also an integral part of the car's safety system. The bonding problem between the glass glue and the painted body may lead to serious quality and safety hazards. Summary of the invention

[0004] The main purpose of the present invention is to provide a method for detecting the quality of automobile spraying, aiming to solve the technical problem in the prior art that glass glue is easily peeled off due to automobile paint spraying.

[0005] To achieve the above object, the present invention provides a method for detecting the quality of automobile spraying, characterized in that the method comprises:

[0006] providing a first coating layer on the vehicle body;

[0007] pasting a covering layer on a predetermined area on the first coating layer;

[0008] Disposing a second coating layer on the vehicle body and the first coating layer, and curing the first coating layer and the second coating layer;

[0009] removing the covering layer and detecting material parameters of the preset area;

[0010] Comparing the material parameters with preset material parameters and generating a comparison result;

[0011] Whether the vehicle body spraying quality is qualified is determined according to the comparison result.

[0012] Optionally, the step of pasting a covering layer on a preset area on the first coating layer includes:

[0013] Selecting the preset area on the first coating layer;

[0014] The masking tape is pasted in the preset area to form the covering layer covering the preset area.

[0015] Optionally, the step of removing the covering layer and detecting the material parameters of the preset area includes:

[0016] Peel off the masking tape;

[0017] Performing a free energy test on the preset area after the masking tape is peeled off, and obtaining a free energy value of the preset area;

[0018] The material parameter is generated according to the free energy value.

[0019] Optionally, after the step of performing a free energy test on the preset area after removing the masking tape and obtaining the free energy value of the preset area, the method further includes:

[0020] Performing component analysis on the preset area to obtain the material composition of the surface of the preset area;

[0021] The step of generating the material parameter according to the free energy value comprises:

[0022] The material parameter is generated according to the material composition and the free energy value.

[0023] Optionally, the automobile spraying quality detection method further includes:

[0024] providing a sample coating layer on the sample;

[0025] Curing the coating layer of the sample;

[0026] Performing a free energy test on the sample coating layer after curing and obtaining a preset free energy value;

[0027] Performing component analysis on the sample coating layer after curing to obtain a preset material component on the surface of the sample coating layer;

[0028] The preset material parameters are generated according to the preset free energy and the preset material composition.

[0029] Optionally, the step of comparing the material parameters with the preset material parameters includes:

[0030] Calculating the difference between the free energy value and the preset free energy value;

[0031] Comparing the material composition with the preset material composition and obtaining a comparison result;

[0032] The step of determining whether the vehicle body spraying quality is qualified according to the comparison result comprises:

[0033] When the difference is less than or equal to the preset difference, and the material composition is consistent with the preset material composition, it is determined that the vehicle body spraying quality is qualified;

[0034] When the difference is greater than the preset difference, or the material composition is inconsistent with the preset material composition, it is determined that the vehicle body spraying quality is unqualified.

[0035] Optionally, after the step of peeling off the masking tape, the method further comprises:

[0036] The first coating layer and the second coating layer are cleaned.

[0037] Optionally, after the step of curing the sample coating layer, the method further comprises:

[0038] The coating layer of the sample is cleaned.

[0039] Optionally, the step of providing a first coating layer on the vehicle body comprises:

[0040] Applying primer paint to the vehicle body;

[0041] Applying a first color paint on the primer;

[0042] A clear varnish is applied on the color paint.

[0043] Optionally, the step of providing a sample coating layer on the sample comprises:

[0044] Applying a preset primer paint on the sample;

[0045] Applying a preset color paint on the preset primer;

[0046] A preset clear varnish is applied on the preset color paint.

[0047] The technical solution of the present invention performs detection at the position where the two coating layers are connected, that is, detects the material parameters of the preset area, and determines the material used in the current production process based on the material parameters, whether a reaction will occur during processing to cause a change in the final material, and whether the production requirements are still met after the change, thereby ensuring the quality of automobile spraying and eliminating quality and safety hazards of automobiles. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0049] Figure 1 It is a flow chart of the first embodiment of the automobile spraying quality detection method of the present invention;

[0050] Figure 2 It is a flow chart of a second embodiment of the automobile spraying quality detection method of the present invention;

[0051] Figure 3 It is a flow chart of a third embodiment of the automobile spraying quality detection method of the present invention;

[0052] Figure 4 It is a flow chart of a fourth embodiment of the automobile spraying quality detection method of the present invention;

[0053] Figure 5 Schematic diagram of the fifth embodiment of the automobile spraying quality inspection method of the present invention.

[0054] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0057] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0058] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0060] The present invention proposes a method for detecting the quality of automobile spraying. Figure 1 , Figure 1 The flowchart of the first embodiment of the automobile spraying quality detection method of the present invention specifically includes the following steps:

[0061] Step 10: Apply the first coating layer on the body;

[0062] Step 20: Pasting a covering layer on a preset area on the first coating layer;

[0063] Step 30: disposing a second coating layer on the vehicle body and the first coating layer, and curing the first coating layer and the second coating layer;

[0064] Step 40: removing the covering layer and detecting material parameters of the preset area;

[0065] Step 50: Compare the material parameters with preset material parameters and generate a comparison result;

[0066] Step 60: Determine whether the vehicle body spraying quality is qualified according to the comparison result.

[0067] In this embodiment, the paint spraying process can be directly performed on the vehicle body, or other steel plates can be selected to simulate the vehicle body for experiments. First, the vehicle body is sprayed for the first time to form the first coating layer on the vehicle body. Before the second spraying, in order to prevent the two colors of paint from mixing, it is necessary to set a covering layer on the first coating layer for shielding. According to the design requirements of the vehicle model, a part of the first coating layer is selected in advance as the preset area, and the covering layer is pasted on the preset area. When the vehicle body is sprayed for the second time, the second spray layer will adhere to the covering layer and will not mix with the first coating layer. After the painting is completed, the vehicle body is cured to fix the first coating layer and the second coating layer. After the first coating layer and the second coating layer are cured, the covering layer in the preset area is removed. After the covering layer is removed, the second coating layer sprayed on the covering layer is removed together, so that the first coating layer at the bottom is leaked out to form two coating layers of different colors. At this point, the spraying process of the vehicle body is completed.

[0068] The preset area is inspected to obtain the material parameters within the preset area. A control group is set up. In order to ensure that the vehicle body spraying process meets the quality requirements and avoid glass glue peeling. Therefore, the control group should be set to compare with a vehicle body with only one coating layer, that is, a single-color coating method that does not cause glass glue peeling in the prior art. By comparing the material parameters of the preset area with those of the control group, when the material parameters in the preset area are similar or consistent with the material parameters of the control group, it means that the spraying of the vehicle body meets the quality requirements. When the material parameters of the preset area and the control group are greatly different, it means that the current processing method has the risk of glass glue peeling, so it is necessary to replace the materials of the first coating layer, the second coating layer and the covering layer, and repeat the experiment.

[0069] In addition, in this embodiment, sampling and testing can be performed at any position other than the preset area on the vehicle body, and compared with the control group, so as to further improve the accuracy of the automobile spraying quality testing method of the present invention.

[0070] The technical solution of the present invention performs detection at the position where the two coating layers are connected, that is, detects the material parameters of the preset area, and determines the material used in the current production process based on the material parameters, whether a reaction will occur during processing to cause a change in the final material, and whether the production requirements are still met after the change, thereby ensuring the quality of automobile spraying and eliminating quality and safety hazards of automobiles.

[0071] For further information, please refer to Figure 2 , Figure 2This is a flow chart of the second embodiment of the automobile spraying quality inspection method of the present invention, step S20 includes:

[0072] Step S21: selecting the preset area on the first coating layer;

[0073] Step S22: sticking a masking tape in the preset area to form the covering layer covering the preset area.

[0074] Step S40 includes:

[0075] Step S41: peeling off the masking tape;

[0076] Step S42: performing a free energy test on the preset area after the masking tape is peeled off, and obtaining a free energy value of the preset area;

[0077] Step S43: performing component analysis on the preset area to obtain the material composition of the surface of the preset area.

[0078] Step S44: generating the material parameters according to the material composition and the free energy value.

[0079] As an embodiment, during the painting process, after the first coating layer is applied, a masking tape is pasted on the preset area to form the covering layer to cover the preset area. After the masking tape is peeled off from the color plate, the surface free energy of the area covered by the masking tape is tested, and then compared with the surface free energy value of the blank sample. When the free energy difference between them is outside the threshold allowable value, it is determined that it does not meet the quality requirements. The materials of the first coating layer, the second coating layer and the covering layer should be replaced, and the above steps should be repeated for experiments; if the difference is within the threshold allowable value, the composite quality requirements are determined.

[0080] In order to further improve the accuracy of the automobile spraying quality detection method of the present invention, the component analysis can also be performed on the masking tape covered area, and the change of the material composition on the surface of the preset area can be judged according to the analysis result. Therefore, according to the change of the material composition, whether the first coating layer, the second coating layer and the covering layer are compatible can be specifically analyzed. In this way, the accuracy of the detection result is further improved, and the production quality is guaranteed.

[0081] In addition, after step S41, the following steps are also included:

[0082] Step S45: Clean the first coating layer and the second coating layer. In this embodiment, when the covering layer is peeled off from the vehicle body, the vehicle body surface needs to be cleaned. Specifically, the color plate is cleaned with an organic solvent. The organic solvent is ethanol, isopropanol, acetone or a combination thereof. To ensure the accuracy of the parameter detection results, the material parameters should be detected after the vehicle body is cleaned.

[0083] For further information, please refer to Figure 3 , Figure 3 This is a flow chart of a third embodiment of the automobile spraying quality detection method of the present invention, wherein the automobile spraying quality detection method further comprises the following steps:

[0084] Step S71: setting a sample coating layer on the sample;

[0085] Step S72: curing the sample coating layer;

[0086] Step S73: performing a free energy test on the sample coating layer after the curing treatment and obtaining a preset free energy value;

[0087] Step S74: performing component analysis on the sample coating layer after curing to obtain a preset material component on the surface of the sample coating layer;

[0088] Step S75: generating the preset material parameters according to the preset free energy and the preset material composition.

[0089] In this embodiment, the control group shall use the vehicle body or steel of the same material as the experimental vehicle body as the sample for comparison, and a sample coating layer shall be set on the sample, and the material of the sample coating layer may be the same as the material of the first coating layer and / or the second coating layer. After the sample coating layer is coated, the sample coating layer is also cured. It should be noted that after step S72, step S76 is also included: cleaning the sample coating layer. Among them, the reagent used to clean the sample coating layer should be the same as the reagent used in the experiment, which is ethanol, isopropanol, acetone or a combination thereof. Thereby ensuring that the variables of the control group are consistent.

[0090] After cleaning, the control group is also subjected to free energy detection to obtain the preset free energy value, and component analysis is performed to obtain the preset material composition on the surface of the sample coating layer.

[0091] For further information, please refer to Figure 4 , Figure 4 This is a flow chart of the fourth embodiment of the automobile spraying quality inspection method of the present invention, step S50 includes the following steps:

[0092] Step S51: calculating the difference between the free energy value and the preset free energy value;

[0093] Step S52: comparing the material composition with the preset material composition and obtaining a comparison result;

[0094] Step S60 includes the following steps:

[0095] Step S61: when the difference is less than or equal to the preset difference, and the material composition is consistent with the preset material composition, it is determined that the vehicle body spraying quality is qualified;

[0096] Step S62: When the difference is greater than the preset difference, or the material composition is inconsistent with the preset material composition, it is determined that the vehicle body spraying quality is unqualified.

[0097] First, the free energy value is compared with the preset free energy value, and when the difference between the free energy value and the preset free energy value is less than the preset difference, the material components are compared to analyze whether other new substances are generated in the preset area or other positions on the vehicle body during the spraying process, thereby affecting the peeling of the glass glue.

[0098] As an embodiment, two kinds of tapes made of Tesa 4657PV1 and nichiban 535A are used as masking tapes, the first spray layer is 3U5 red paint, and the second spray layer is 209 black paint. The vehicle body or the steel plate of the same material is painted through the above steps. A free energy test is performed in the preset area, and the free energy value obtained by the test is compared with the preset free energy value of the control group. According to the experimental results, the difference between them is within the allowable range of the preset difference.

[0099] Therefore, it is necessary to further analyze the components of the preset area. Through infrared FTIR spectrum analysis, when nichiban 535A is used as a masking tape, there are strong changes in absorption peaks at 1800~1500cm-1 and 1300~1000cm-1, corresponding to the absorption peaks of C=O and unsaturated bonds, respectively. This shows that when nichiban 535A is used as a masking tape, the masking tape interacts with the incompletely cured car paint during the curing process, resulting in the generation of new substances or chemical groups. This new substance causes the change in the surface properties of the painted car body, and is also the reason for the final deterioration of the glass glue bonding strength. When Tesa 4657PV1 is used as a masking tape, no new substances are generated. Therefore, through experimental testing, it can be found that Tesa 4657PV1 is compatible with the two paints as a masking tape.

[0100] As another embodiment, Tesa 4657PV1 and nichiban 535A are used as masking tapes respectively, the first spray layer is 3R3 red paint, and the second spray layer is 209 black paint, and the vehicle body or the steel plate of the same material is painted through the above steps. A free energy test is performed in the preset area, and the free energy value obtained by the test is compared with the preset free energy value of the control group. According to the experimental results, the difference corresponding to the use of Tesa 4657PV1 as the masking tape is within the allowable range of the preset difference, while the difference corresponding to the use of nichiban 535A masking tape is outside the allowable range of the preset difference.

[0101] Further infrared FTIR spectrum analysis of the surface material in the preset area when Tesa 4657PV1 was used as masking tape revealed that there were also obvious changes in absorption peaks at 1800-1500cm-1 and 1300-1000cm-1. This indicates that the combination will also interact with each other, resulting in the generation of new substances or chemical groups and changing the surface properties of the vehicle body. Therefore, through experimental testing, it can be found that the combination of Tesa 4657PV1 as masking tape and the above two paints, and nichiban 535A tape and the above two paints are not compatible.

[0102] As another embodiment, nichiban 535Y is used as a masking tape, the first spray layer is 3R3 red paint, and the second spray layer is 209 black paint. The vehicle body or a steel plate of the same material is painted through the above steps. A free energy test is performed in the preset area, and the free energy value obtained by the test is compared with the preset free energy value of the control group. According to the experimental results, the difference is outside the allowable range of the preset difference. Therefore, it can be found through experimental detection that nichiban 535Y is not compatible with the above two paints.

[0103] In this embodiment, the automobile spraying quality detection method of the present invention is further tested on different materials, so that masking tapes and paints that are compatible with each other can be found, thereby ensuring the quality of the car body spraying.

[0104] For further information, please refer to Figure 5 , Figure 5 This is a flow chart of the fifth embodiment of the automobile spraying quality inspection method of the present invention, step S10 includes the following steps:

[0105] Step S11: applying primer paint on the vehicle body;

[0106] Step S12: applying a first color paint on the primer;

[0107] Step S13: applying clear varnish on the color paint.

[0108] The first coating layer includes three kinds of paints. First, a primer is applied to the vehicle body, a first color paint is applied on the primer, and finally a clear coat is applied on the first color paint. After curing, the first coating layer is formed. It should be noted that, in this embodiment, the second coating layer also includes three kinds of paints, namely, a primer, a color paint and a clear coat. Different from the first coating layer, the color paint in the second coating layer is different in color from the color paint in the first coating layer.

[0109] In addition, step S51 specifically includes the following steps:

[0110] Step S511: applying a preset primer paint on the sample;

[0111] Step S512: applying a preset color paint on the preset primer;

[0112] Step S513: applying a preset clear varnish onto the preset color paint.

[0113] In this embodiment, in order to ensure that the variables of the control group and the experimental group are consistent, the preset primer paint, the preset color paint and the preset clear paint are respectively the same as the materials of the primer paint, the first color paint and the clear paint, thereby ensuring the reliability and accuracy of the automobile spraying quality detection method of the present invention.

[0114] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A method for detecting the quality of automobile spraying, characterized in that: The automobile spraying quality detection method comprises: providing a first coating layer on the vehicle body; Selecting a preset area on the first coating layer; Pasting a masking tape in the preset area to form a covering layer covering the preset area; Disposing a second coating layer on the vehicle body and the first coating layer, and curing the first coating layer and the second coating layer; Peel off the masking tape; Performing a free energy test on the preset area after the masking tape is peeled off, and obtaining a free energy value of the preset area; Performing component analysis on the preset area to obtain the material composition of the surface of the preset area; generating material parameters according to the material composition and the free energy value; providing a sample coating layer on the sample; Curing the coating layer of the sample; Performing a free energy test on the sample coating layer after curing and obtaining a preset free energy value; Performing component analysis on the sample coating layer after curing to obtain a preset material component on the surface of the sample coating layer; generating preset material parameters according to the preset free energy and the preset material composition; Comparing the material parameters with preset material parameters and generating a comparison result; Whether the vehicle body spraying quality is qualified is determined according to the comparison result.

2. The automobile spraying quality detection method according to claim 1, characterized in that: The step of comparing the material parameters with the preset material parameters comprises: Calculating the difference between the free energy value and the preset free energy value; Comparing the material composition with the preset material composition and obtaining a comparison result; The step of determining whether the vehicle body spraying quality is qualified according to the comparison result comprises: When the difference is less than or equal to the preset difference, and the material composition is consistent with the preset material composition, it is determined that the vehicle body spraying quality is qualified; When the difference is greater than the preset difference, or the material composition is inconsistent with the preset material composition, it is determined that the vehicle body spraying quality is unqualified.

3. The automobile spraying quality detection method according to claim 1 is characterized in that: After the step of curing the sample coating layer, the method further comprises: The coating layer of the sample is cleaned.

4. The automobile spraying quality detection method according to claim 1, characterized in that: The steps for setting up the sample coating on the sample include: Applying a preset primer paint on the sample; Applying a preset color paint on the preset primer; A preset clear varnish is applied on the preset color paint.

5. The automobile spraying quality detection method according to claim 1, characterized in that: After the step of peeling off the masking tape, the method further comprises: The first coating layer and the second coating layer are cleaned.

6. The automobile spraying quality detection method according to any one of claims 1 to 5, characterized in that: The steps of providing a first coating layer on the vehicle body include: Applying primer paint to the vehicle body; Applying a first color paint on the primer; A clear varnish is applied on the color paint.

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