A method for confirming a color difference of a paint

Abstract

This invention discloses a method for confirming color difference in coatings, comprising: circulating the paint to be tested in a paint pump for a first preset time; providing at least two sets of electrophoretic test plates, A and B, wherein set A includes at least three test plates A1, A2, and A3, and set B includes at least three test plates B1, B2, and B3; spraying A1, A2, A3, B1, B2, and B3 respectively; and baking A1, A2, A3, B1, B2, and B3 respectively in a topcoat baking oven. Film thickness tests were performed on A1, A2, and A3 to obtain the first film thickness parameters of the electrophoresis test plates in group A; color difference tests were performed on B1, B2, and B3 to obtain the first color difference variation parameters of the electrophoresis test plates in group B; based on the first film thickness parameters and the first color difference variation parameters, the first correspondence between the color difference and film thickness of the paint to be tested was calculated; based on the first correspondence, the first actual color difference parameters of the paint to be tested under the standard film thickness were calculated; and the first actual color difference parameters were compared with the range of the standard color difference parameters.

Description

Technical Field

[0001] This invention relates to the field of automobile assembly and manufacturing technology, and in particular to a method for confirming color difference in coatings. Background Technology

[0002] After the paint to be inspected is delivered to the painting site, it is generally added to the system according to natural consumption after confirming that the color difference data of the paint batch sample is not significantly off. Then, it is sprayed on the product body, dried, and the color difference is measured. Alternatively, if conditions permit, the paint in the system is replaced with a new batch of paint (or the new batch of paint is put into the idle system), and a test vehicle or a small number of product bodies are sprayed. After drying, the color difference is measured. Because the robots and ovens used by the paint manufacturer to spray the batch samples are somewhat different from those used on the painting site, the color difference of the paint sprayed on site will differ from that of the shipped sample. If the color difference during on-site spraying meets the delivery standard, the paint can be used in batches. If the color difference does not meet the delivery standard, the paint needs to be adjusted on-site urgently. Adjustment measures include adjusting spraying parameters and adding colorant on-site. If the adjusted color difference meets the requirements, the paint can still be used. If the color difference does not meet the requirements after on-site adjustment, the paint is returned. When confirming the color difference, it is necessary to go through the processes of natural consumption addition and replacement paint addition. During the natural consumption addition process, the amount of new batch paint in the main tank increases gradually, and the color difference will not deviate drastically, but there may be a delay in deviation. At the same time, the inability to accurately estimate the amount of new batch paint added may lead to inaccurate on-site assessment of the color difference of the new batch. During the replacement paint addition process, confirming the color difference by replacing paint or using an idle system to add new batch paint will occupy a long production scheduling interval and related equipment, which is time-consuming and labor-intensive. Furthermore, the system uses a large amount of paint. If a color difference occurs in the new batch paint and multiple colorant schemes need to be verified, the paint needs to be replaced every time the scheme is changed, which requires an excessive amount of new batch paint, and the actual operation process also has certain limitations. Summary of the Invention

[0003] The main objective of this invention is to propose a method for confirming color difference in coatings, which aims to solve the problems of inaccurate assessment, time-consuming and labor-intensive methods, and operational limitations caused by excessive loss of the paint to be tested in existing methods for confirming color difference in coatings.

[0004] To achieve the above objectives, this invention proposes a method for confirming color difference in coatings, comprising the following steps:

[0005] The paint to be tested is put into the paint pump and circulated for the first preset time.

[0006] Provide at least two sets of electrophoresis plates, A and B. Set A of electrophoresis plates shall include at least three plates, A1, A2 and A3, and set B of electrophoresis plates shall include at least three plates, B1, B2 and B3.

[0007] The paint robot is connected to the paint pump and sprays A1 and B1 with a first preset flow rate, A2 and B2 with a second preset flow rate, and A3 and B3 with a third preset flow rate.

[0008] B1, B2 and B3 were placed on the outside of the test vehicle, and clear coat was applied to B1, B2 and B3 using a clear coat robot in the manner of body painting.

[0009] Place A1, A2, and A3 inside the test vehicle;

[0010] The test vehicle was placed in a paint baking oven to bake A1, A2, A3, B1, B2 and B3;

[0011] Film thickness was measured for A1, A2 and A3 to obtain the first film thickness parameters of the electrophoresis plates in group A.

[0012] Color difference tests were performed on B1, B2 and B3 to obtain the first color difference change parameters of the electrophoresis test plates in group B.

[0013] Based on the first film thickness parameter and the first color difference change parameter, calculate the first correspondence between the color difference and film thickness of the paint to be tested;

[0014] Based on the first correspondence, calculate the first actual color difference parameter of the paint to be tested under the standard film thickness;

[0015] When the first actual color difference parameter is within the standard color difference parameter range, the paint to be tested is determined to meet the requirements and is put into the can for use.

[0016] When the first actual color difference parameter is outside the range of the standard color difference parameter, the paint to be tested is subjected to color paste adjustment processing.

[0017] Optionally, before the step of connecting the paint robot to the paint pump and spraying A1 and B1 at a first preset flow rate, spraying A2 and B2 at a second preset flow rate, and spraying A3 and B3 at a third preset flow rate, the method further includes:

[0018] Apply two shielding strips to A1, A2, and A3;

[0019] Apply intermediate primer to A1, A2, A3, B1, B2, and B3;

[0020] Remove one of the shielding strips from A1, A2, and A3 respectively.

[0021] Optionally, before the step of placing A1, A2, and A3 inside the test vehicle, the method further includes:

[0022] Remove the other shielding strip from A1, A2, and A3 respectively.

[0023] Optionally, the step of spraying intermediate primer onto A1, A2, A3, B1, B2, and B3 includes:

[0024] Wipe A1, A2, A3, B1, B2, and B3 successively with an alcohol swab and an adhesive cloth;

[0025] Place aluminum foil in the spraying area;

[0026] Place A1, A2, A3, B1, B2, and B3 in the middle of the tin foil, with A1 and B1, A2 and B2, and A3 and B3 arranged side by side.

[0027] A mid-coat robot was used to spray the mid-coat primer onto A1, A2, A3, B1, B2, and B3.

[0028] Optionally, after the steps of connecting the paint robot to the paint pump and spraying A1 and B1 at a first preset flow rate, spraying A2 and B2 at a second preset flow rate, and spraying A3 and B3 at a third preset flow rate, and before the steps of placing B1, B2, and B3 on the outside of the test vehicle and spraying clear coat onto B1, B2, and B3 using a clear coat robot in the manner of body painting, the method further includes:

[0029] A second preset flash-drying time is applied to A1, A2, A3, B1, B2, and B3; wherein, solvent-based coating lines flash-dry at room temperature, and water-based paint coating lines flash-dry by heating.

[0030] Forcefully cool A1, A2, A3, B1, B2, and B3 to the preset temperature.

[0031] Optionally, the step of connecting the paint robot to the paint pump and spraying A1 and B1 at a first preset flow rate, A2 and B2 at a second preset flow rate, and A3 and B3 at a third preset flow rate includes:

[0032] A1 and B1, A2 and B2, and A3 and B3 are sprayed once each using the first preset flow rate, the second preset flow rate, and the third preset flow rate, respectively.

[0033] Let it stand for the third preset time;

[0034] A1 and B1, A2 and B2, and A3 and B3 are sprayed a second time using the first preset flow rate, the second preset flow rate, and the third preset flow rate, respectively.

[0035] Optionally, after the step of performing color paste adjustment processing on the paint to be tested when the first actual color difference parameter is outside the range of the standard color difference parameter, the method includes:

[0036] Perform the above spraying operation steps using the adjusted paint to be inspected;

[0037] Obtain the adjusted second film thickness parameters and second color difference variation parameters of the paint to be tested;

[0038] Based on the second film thickness parameter and the second color difference change parameter, calculate the second correspondence between the color difference and film thickness of the adjusted paint to be tested;

[0039] Based on the second correspondence, calculate the second actual color difference parameter of the paint to be tested after adjustment under the standard film thickness;

[0040] Compare the second actual color difference parameter with the standard color difference parameter range;

[0041] When the second actual color difference parameter is within the range of the standard color difference parameter, the adjusted paint to be tested is determined to meet the requirements and can be put into the can for use.

[0042] If the second actual color difference parameter is outside the range of the standard color difference parameter, the adjusted paint to be tested is determined to be unsatisfactory and is taken out of service.

[0043] Optionally, before the step of circulating the paint to be tested in the paint pump for a first preset time, the method further includes:

[0044] The initial color difference of the paint to be tested is obtained by comparing it with a standard paint to be tested.

[0045] If the initial color difference is within the preset color difference parameter range, then the paint to be tested is determined to meet the entry inspection standard.

[0046] Optionally, before the step of circulating the paint in the paint pump for a preset time, the method further includes:

[0047] The fourth preset time for stirring the paint to be tested;

[0048] The stirred paint to be tested is added to the paint pump.

[0049] Optionally, prior to the step of connecting the paint robot to the paint pump, the method further includes:

[0050] The spraying programs of the paint robot, intermediate coat robot, and clear coat robot were tested on site.

[0051] Input information parameters, wherein the information parameters include workpiece coordinates, vehicle model, and brush table;

[0052] Set up a spraying area, wherein the size of the spraying area is set to 700mm*1000mm;

[0053] Adjust the gun distance L, where the gun distance L is the distance from the cup head to the grid plate, L = 250 ± 10 mm;

[0054] Adjust the gun velocity V, wherein the gun velocity is 500mm / s≤V≤700mm / s;

[0055] Adjust the pitch l, wherein the pitch is 80mm ≤ l ≤ 100mm.

[0056] The technical solution of this invention provides at least two sets of electrophoresis test plates, A and B. Set A includes at least three test plates: A1, A2, and A3, and set B includes at least three test plates: B1, B2, and B3. Color paint is sprayed onto A1 and B1 at a first preset flow rate, onto A2 and B2 at a second preset flow rate, and onto A3 and B3 at a third preset flow rate. B1, B2, and B3 are placed on the outside of a test vehicle, and clear coat is sprayed onto B1, B2, and B3 using a clear coat robot, similar to vehicle body painting. For A... 1. Baking of A2, A3, B1, B2, and B3; film thickness testing of A1, A2, and A3 to obtain the first film thickness parameter of group A electrophoresis test plates; color difference testing of B1, B2, and B3 to obtain the first color difference variation parameter of group B electrophoresis test plates; calculation of the first correspondence between the color difference and film thickness of the paint to be tested based on the first film thickness parameter and the first color difference variation parameter; calculation of the first actual color difference parameter of the paint to be tested under standard film thickness based on the first correspondence; when the first actual color difference parameter is within the standard color... If the actual color difference parameter is within the specified range, the paint to be tested is deemed to meet the requirements and can be put into the tank for use. If the actual color difference parameter is outside the specified range, the paint to be tested is subjected to color paste adjustment. Thus, this invention provides a method for confirming paint color difference, which can be used as an inspection means for color difference testing of new batches of paint upon arrival. It can also confirm in advance whether the color difference of the new batch of paint matches the site conditions, and can avoid the situation where the color difference of the new batch of paint meets the standard when shipped but does not meet the site requirements when actually used due to inconsistencies between the paint manufacturing spraying equipment and baking conditions and the coating site conditions. This improves the evaluation accuracy of the paint color difference confirmation method. At the same time, using the processing method provided by this invention, it is only necessary to spray on multiple electrophoretic test plates according to the flow gradient, and determine whether the color difference of the paint to be tested meets the requirements by detecting the color difference and film thickness of each electrophoretic test plate. This simplifies the steps of the paint color difference confirmation method and saves time and effort. Furthermore, using the processing method provided by this invention, it is not necessary to consume a large amount of paint to be tested, thus avoiding the operational limitations caused by excessive waste of paint to be tested. Attached Figure Description

[0057] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0058] Figure 1 A schematic diagram of the structure of the first embodiment of the coating color difference confirmation method provided by the present invention;

[0059] Figure 2 A schematic diagram of the structure of the second embodiment of the coating color difference confirmation method provided by the present invention;

[0060] Figure 3 A schematic diagram of the third embodiment of the coating color difference confirmation method provided by the present invention;

[0061] Figure 4 This is a schematic diagram of the fourth embodiment of the coating color difference confirmation method provided by the present invention;

[0062] Figure 5 This is a schematic diagram of the fifth embodiment of the coating color difference confirmation method provided by the present invention;

[0063] Figure 6 This is a schematic diagram of the sixth embodiment of the coating color difference confirmation method provided by the present invention.

[0064] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0065] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0066] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0067] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0068] After the paint to be inspected is delivered to the painting site, it is generally added to the system according to natural consumption after confirming that the color difference data of the paint batch sample is not significantly off. Then, it is sprayed on the product body, dried, and the color difference is measured. Alternatively, if conditions permit, the paint in the system is replaced with a new batch of paint (or the new batch of paint is put into the idle system), and a test vehicle or a small number of product bodies are sprayed. After drying, the color difference is measured. Because the robots and ovens used by the paint manufacturer to spray the batch samples are somewhat different from those used on the painting site, the color difference of the paint sprayed on site will differ from that of the shipped sample. If the color difference during on-site spraying meets the delivery standard, the paint can be used in batches. If the color difference does not meet the delivery standard, the paint needs to be adjusted on-site urgently. Adjustment measures include adjusting spraying parameters and adding colorant on-site. If the adjusted color difference meets the requirements, the paint can still be used. If the color difference does not meet the requirements after on-site adjustment, the paint is returned. When confirming the color difference, it is necessary to go through the processes of natural consumption addition and replacement paint addition. During the natural consumption addition process, the amount of new batch paint in the main tank increases gradually, and the color difference will not deviate drastically, but there may be a delay in deviation. At the same time, the inability to accurately estimate the amount of new batch paint added may lead to inaccurate on-site assessment of the color difference of the new batch. During the replacement paint addition process, confirming the color difference by replacing paint or using an idle system to add new batch paint will occupy a long production scheduling interval and related equipment, which is time-consuming and labor-intensive. Furthermore, the system uses a large amount of paint. If a color difference occurs in the new batch paint and multiple colorant schemes need to be verified, the paint needs to be replaced every time the scheme is changed, which requires an excessive amount of new batch paint, and the actual operation process also has certain limitations.

[0069] In view of this, the present invention provides a method for confirming the color difference of coatings. Figures 1 to 6 This is a specific embodiment of the coating color difference confirmation method provided by the present invention.

[0070] Please see Figure 1 , Figure 1This is the first embodiment provided by the present invention.

[0071] The method for confirming color difference in coatings includes the following steps:

[0072] S20: The paint to be tested is put into the paint pump and circulated for the first preset time;

[0073] S30: Provide at least two sets of electrophoresis plates, A and B, wherein the electrophoresis plates of set A include at least three plates, A1, A2 and A3, and the electrophoresis plates of set B include at least three plates, B1, B2 and B3.

[0074] S70: Connect the paint robot to the paint pump and spray A1 and B1 with a first preset flow rate, spray A2 and B2 with a second preset flow rate, and spray A3 and B3 with a third preset flow rate.

[0075] S100: Place B1, B2 and B3 on the outside of the test vehicle, and use a clear coat robot to spray clear coat on B1, B2 and B3 in the manner of body painting;

[0076] S120: Place A1, A2 and A3 inside the test vehicle;

[0077] S130: Place the test vehicle in a paint baking oven and bake A1, A2, A3, B1, B2 and B3;

[0078] S140: Perform film thickness tests on A1, A2 and A3 to obtain the first film thickness parameters of the electrophoresis test plate of group A;

[0079] S150: Perform color difference tests on B1, B2 and B3 to obtain the first color difference change parameters of the electrophoresis test plates of group B;

[0080] S160: Calculate the first correspondence between the color difference and film thickness of the paint to be tested based on the first film thickness parameter and the first color difference change parameter;

[0081] S170: Based on the first correspondence, calculate the first actual color difference parameter of the paint to be tested under the standard film thickness;

[0082] S180: When the first actual color difference parameter is within the standard color difference parameter range, the paint to be tested is determined to meet the requirements and is put into the can for use;

[0083] S190: When the first actual color difference parameter is outside the range of the standard color difference parameter, the paint to be tested is subjected to color paste adjustment processing.

[0084] In the technical solution of this invention, at least two sets of electrophoresis test plates, A and B, are provided. Set A includes at least three test plates: A1, A2, and A3, and set B includes at least three test plates: B1, B2, and B3. Color paint is sprayed onto A1 and B1 at a first preset flow rate, onto A2 and B2 at a second preset flow rate, and onto A3 and B3 at a third preset flow rate. B1, B2, and B3 are placed on the outside of a test vehicle, and clear coat is sprayed onto B1, B2, and B3 using a clear coat robot, similar to vehicle body painting. For A... 1. Baking of A2, A3, B1, B2, and B3; film thickness testing of A1, A2, and A3 to obtain the first film thickness parameter of group A electrophoresis test plates; color difference testing of B1, B2, and B3 to obtain the first color difference variation parameter of group B electrophoresis test plates; calculation of the first correspondence between the color difference and film thickness of the paint to be tested based on the first film thickness parameter and the first color difference variation parameter; calculation of the first actual color difference parameter of the paint to be tested under standard film thickness based on the first correspondence; when the first actual color difference parameter is within the standard color... If the actual color difference parameter is within the specified range, the paint to be tested is deemed to meet the requirements and can be put into the tank for use. If the actual color difference parameter is outside the specified range, the paint to be tested is subjected to color paste adjustment. Thus, this invention provides a method for confirming paint color difference, which can be used as an inspection means for color difference testing of new batches of paint upon arrival. It can also confirm in advance whether the color difference of the new batch of paint matches the site conditions, and can avoid the situation where the color difference of the new batch of paint meets the standard when shipped but does not meet the site requirements when actually used due to inconsistencies between the paint manufacturing spraying equipment and baking conditions and the coating site conditions. This improves the evaluation accuracy of the paint color difference confirmation method. At the same time, using the processing method provided by this invention, it is only necessary to spray on multiple electrophoretic test plates according to the flow gradient, and determine whether the color difference of the paint to be tested meets the requirements by detecting the color difference and film thickness of each electrophoretic test plate. This simplifies the steps of the paint color difference confirmation method and saves time and effort. Furthermore, using the processing method provided by this invention, it is not necessary to consume a large amount of paint to be tested, thus avoiding the operational limitations caused by excessive waste of paint to be tested.

[0085] The present invention does not limit the size of the electrophoresis test plate. Specifically, in this embodiment, the size of test plates A1, A2, A3, B1, B2 and B3 is preferably 100mm*200mm or 100mm*300mm.

[0086] Please see Figure 2 , Figure 2 This is a second embodiment of the present invention.

[0087] Before step S70, which involves connecting the paint robot to the paint pump and spraying A1 and B1 at a first preset flow rate, A2 and B2 at a second preset flow rate, and A3 and B3 at a third preset flow rate, the method further includes:

[0088] S40: Apply two shielding strips to A1, A2 and A3;

[0089] S50: Apply intermediate primer to A1, A2, A3, B1, B2 and B3;

[0090] S60: Remove one shielding strip from A1, A2 and A3 respectively.

[0091] In this embodiment, prior to step S120 of placing A1, A2, and A3 inside the test vehicle, the method further includes:

[0092] S110: Remove the other shielding strip on A1, A2 and A3 respectively.

[0093] In this embodiment, at least two sets of electrophoresis test plates, A and B, are provided. Set A includes at least three test plates: A1, A2, and A3, and set B includes at least three test plates: B1, B2, and B3. Two masking tapes are attached to A1, A2, and A3. A primer is sprayed onto A1, A2, A3, B1, B2, and B3. One masking tape is removed from each of A1, A2, and A3. A paint robot is connected to the paint pump, and A1 and B1 are sprayed at a first preset flow rate, A2 and B2 at a second preset flow rate, and A3 at a third preset flow rate. B1 and B3 are sprayed; a clear coat robot is used to spray clear coat on B1, B2, and B3; another masking strip on A1, A2, and A3 is removed respectively; thus, taking the A1 test panel as an example, some areas on the A1 test panel have two layers of paint: primer and color coat; corresponding to one of the masking strips, there is one layer of color coat; and corresponding to the other masking strip, there is no paint. Taking the B1 test panel as an example, the B1 test panel has three layers of paint: primer, color coat, and clear coat. In this way, the color difference variation under different paint film thicknesses can be confirmed, providing experimental experience for adjusting the color difference on-site through spraying parameters.

[0094] It should be noted that this invention does not limit the film thickness of the intermediate primer, and users can adjust it according to the actual use scenario. However, in order to ensure the evaluation accuracy of the coating color difference confirmation method, the film thickness deviation of the intermediate primer of each test board A1, A2, A3, B1, B2 and B3 is set to Δ, and -2μm≤Δ≤2μm.

[0095] Please see Figure 3 , Figure 3 This is the third embodiment provided by the present invention.

[0096] The step of spraying intermediate primer S50 onto A1, A2, A3, B1, B2, and B3 includes:

[0097] S501: Wipe A1, A2, A3, B1, B2 and B3 successively with alcohol swabs and adhesive cloth;

[0098] S502: Place aluminum foil in the spraying area;

[0099] S503: Place A1, A2, A3, B1, B2 and B3 in the middle of the tin foil, and arrange A1 and B1, A2 and B2, A3 and B3 side by side;

[0100] S504: Use a mid-coat robot to spray the mid-coat primer onto A1, A2, A3, B1, B2 and B3.

[0101] In this embodiment, two masking tapes are affixed to A1, A2, and A3; A1, A2, A3, B1, B2, and B3 are wiped with alcohol swabs and adhesive cloths respectively; aluminum foil is placed in the spraying area; A1, A2, A3, B1, B2, and B3 are placed in the middle of the aluminum foil, with A1 and B1, A2 and B2, and A3 and B3 arranged side by side; a mid-coat robot is used to spray the mid-coat primer onto A1, A2, A3, B1, B2, and B3; one masking tape is removed from A1, A2, and A3 respectively; that is, two masking tapes are affixed to each of the three electrophoresis test plates A1, A2, and A3 in Group A, while no masking tapes are affixed to the three electrophoresis test plates B1, B2, and B3 in Group B. Wipe A1, A2, A3, B1, B2, and B3 sequentially with an alcohol swab and an adhesive cloth. Before applying the intermediate primer, lay a layer of aluminum foil on the spray plate area to ensure uniform paint mist. When applying the intermediate primer, a spray plate program can be used, with the spray plate flow rate set according to the flow rate for the large area of ​​the car body. Place A1, A2, A3, B1, B2, and B3 in the center of the aluminum foil, and use the intermediate primer robot to spray the intermediate primer onto A1, A2, A3, B1, B2, and B3. Alternatively, A1, A2, A3, B1, B2, and B3 can be directly placed on the test vehicle, and a mid-coat primer can be sprayed according to the vehicle body program parameters. In this way, not only can the mid-coat primer be sprayed on A1, A2, A3, B1, B2, and B3, but also the uniformity of the paint mist can be ensured. At the same time, A1 and B1, A2 and B2, and A3 and B3 are arranged adjacent to each other in sequence to ensure that the mid-coat film thickness of the two electrophoretic test plates in the control group is basically the same, further improving the evaluation accuracy of the paint color difference confirmation method.

[0102] Please see Figure 4 , Figure 4 This is the fourth embodiment provided by the present invention.

[0103] After step S70, which connects the paint robot to the paint pump and sprays A1 and B1 at a first preset flow rate, A2 and B2 at a second preset flow rate, and A3 and B3 at a third preset flow rate, and before step S100, which places B1, B2, and B3 on the outside of the test vehicle and sprays clear coat onto B1, B2, and B3 using a clear coat robot in a body painting manner, the method further includes:

[0104] S80: A second preset flash-drying time for A1, A2, A3, B1, B2 and B3; wherein, solvent-based coating lines flash-dry at room temperature, and water-based paint coating lines flash-dry by heating.

[0105] S90: Forcefully cools A1, A2, A3, B1, B2, and B3 to the preset temperature.

[0106] In this embodiment, a paint robot is connected to the paint pump, and A1 and B1 are sprayed with a first preset flow rate, A2 and B2 with a second preset flow rate, and A3 and B3 with a third preset flow rate. After the paint spraying is completed, the solvent-based coating line flashes dry at room temperature, while the water-based paint coating line flashes dry with heating. After flash drying for the second preset time, A1, A2, A3, B1, B2, and B3 are then rapidly cooled to a preset temperature. This allows the paint to be initially fixed, preventing bubbles or deformation. It should be noted that this invention does not limit the flash drying conditions, the second preset time, or the preset temperature; users can adjust them according to specific usage scenarios. For example, the flash drying conditions can be set to mass production conditions, first adjusting the ambient temperature to 75-100℃, flash drying for 5-7 minutes, then rapidly cooling to below 35℃ before spraying the clear coat. This allows the paint to be initially fixed, preventing bubbles or deformation, and also makes the clear coat spraying smoother.

[0107] Please see Figure 5 , Figure 5 This is the fifth embodiment provided by the present invention.

[0108] Step S70, which connects the paint robot to the paint pump and sprays A1 and B1 at a first preset flow rate, A2 and B2 at a second preset flow rate, and A3 and B3 at a third preset flow rate, includes:

[0109] S701: Spray A1 and B1, A2 and B2, and A3 and B3 once each using the first preset flow rate, the second preset flow rate, and the third preset flow rate;

[0110] S702: Third preset time for settling;

[0111] S703: A1 and B1, A2 and B2, and A3 and B3 are sprayed a second time using the first preset flow rate, the second preset flow rate, and the third preset flow rate, respectively.

[0112] In this embodiment, at least two sets of electrophoresis test plates, A and B, are provided. Set A includes at least three test plates: A1, A2, and A3, and set B includes at least three test plates: B1, B2, and B3. A1 and B1, A2 and B2, and A3 and B3 are coated once using a first preset flow rate, a second preset flow rate, and a third preset flow rate, respectively. The coating is then allowed to stand for a third preset time. A1 and B1, A2 and B2, and A3 and B3 are then coated a second time using the first preset flow rate, the second preset flow rate, and the third preset flow rate, respectively. It should be noted that the present invention does not limit the specific values ​​of the first preset flow rate, the second preset flow rate, the third preset flow rate, and the third preset time; users can adjust these values ​​according to their specific usage scenarios. For example, the paint robot executes a spraying program to spray A1 and B1 once at 90% flow rate, A2 and B2 once at 100% flow rate, and A3 and B3 once at 110% flow rate. After letting A1, A2, A3, B1, B2, and B3 stand for 2 minutes, the paint robot executes a spraying program to spray A1 and B1 a second time at 90% flow rate, A2 and B2 a second time at 100% flow rate, and A3 and B3 a second time at 110% flow rate. In this way, the paint spraying of A1, A2, A3, B1, B2, and B3 is completed.

[0113] It should be noted that the initial spraying flow rate of the paint robot can be set according to the flow rate of a large area of ​​the same color. Then, according to the actual use scenario, the flow rate factor of the paint robot can be modified to achieve the gradient setting of the first preset flow rate, the second preset flow rate, and the third preset flow rate.

[0114] Please see Figure 6 , Figure 6 This is the sixth embodiment provided by the present invention.

[0115] S190, following the step of adjusting the pigment paste of the paint to be tested when the first actual color difference parameter is outside the range of the standard color difference parameter, includes:

[0116] S200: Perform the above spraying operation steps with the adjusted paint to be inspected;

[0117] S210: Obtain the adjusted second film thickness parameter and second color difference change parameter of the paint to be tested;

[0118] S220: Calculate the second correspondence between the color difference and film thickness of the adjusted paint to be tested based on the second film thickness parameter and the second color difference change parameter;

[0119] S230: Based on the second correspondence, calculate the second actual color difference parameter of the paint to be tested after adjustment under the standard film thickness;

[0120] S240: Compare the second actual color difference parameter with the standard color difference parameter range;

[0121] S250: When the second actual color difference parameter is within the range of the standard color difference parameter, it is determined that the adjusted paint to be tested meets the requirements and is put into the can for use;

[0122] S260: When the second actual color difference parameter is outside the range of the standard color difference parameter, it is determined that the adjusted paint to be tested does not meet the requirements and is taken out of service.

[0123] In this embodiment, after the paint to be tested undergoes color paste adjustment, spraying operations are performed according to steps 30 to 100 to confirm the color difference after color matching until a color matching scheme that meets the requirements is determined. If the second actual color difference parameter of the adjusted paint to be tested is within the range of the standard color difference parameter, the adjusted paint to be tested is determined to meet the requirements and is put into use. Before being put into use in the system, the supplier pre-mixes the paint according to the verified scheme. If the second actual color difference parameter is outside the range of the standard color difference parameter, the adjusted paint to be tested is determined to not meet the requirements and is discontinued.

[0124] In the seventh embodiment of the present invention, before step S20, in which the paint to be tested is circulated in the paint pump for a first preset time, the method further includes:

[0125] S00: Compare the paint to be tested with a standard paint to be tested to obtain the initial color difference of the paint to be tested;

[0126] S10: When the initial color difference is within the preset color difference parameter range, it is determined that the paint to be inspected meets the entry inspection standard.

[0127] In this embodiment, after the paint to be tested arrives, and it is confirmed that the paint to be tested meets the entry inspection standards and that there is no significant fluctuation in color difference between paint batches, the paint to be tested can be put into the paint pump. In this way, the color difference is confirmed after the initial test of the paint to be tested, which not only improves the evaluation accuracy of the paint color difference confirmation method, but also avoids the need to consume a large amount of paint to be tested, thereby avoiding the operational limitations caused by excessive waste of paint to be tested.

[0128] In the eighth embodiment of the present invention, before step S20, in which the paint to be tested is circulated in the paint pump for a first preset time, the method further includes:

[0129] S00': Fourth preset time for stirring the paint to be inspected;

[0130] S10': Add the stirred paint to be tested into the paint pump.

[0131] In this embodiment, the paint to be tested is stirred for a fourth preset time; the stirred paint to be tested is then added to the paint pump; the paint to be tested is circulated in the paint pump for a first preset time. This invention does not limit the specific values ​​of the first and fourth preset times; users can adjust them according to specific usage scenarios. For example, before adding the paint to be tested to the paint pump, the paint to be tested needs to be stirred offline for at least 20 minutes to ensure uniform mixing and avoid color differences in spraying due to stratification of pigments or metal powders. When adding the paint to be tested to the paint pump, the return pipe of the paint pump needs to be withdrawn. When the viscosity of the liquid flowing out of the return pipe is close to the viscosity of the paint in the paint pump, the return pipe is then reconnected to the paint pump, and circulation is started simultaneously, circulating for at least 0.5 hours to ensure that the paint to be tested in the paint pump is fully circulated before paint spraying.

[0132] It should be noted that generally 15-18 kg of the paint to be tested is put into the paint pump for circulation, which is sufficient to meet the paint spraying requirements. In this way, it is not necessary to consume a large amount of paint to be tested, thereby avoiding the problem of operational limitations caused by excessive loss of paint to be tested.

[0133] In the ninth embodiment of the present invention, before step S60 of connecting the paint robot to the paint pump, the method further includes:

[0134] S00”: The spraying program of the paint robot, intermediate coat robot and clear coat robot during the debugging site;

[0135] S10”: Input information parameters, wherein the information parameters include workpiece coordinates, machine model, and brush table;

[0136] S20”: Set the spraying area, wherein the size of the spraying area is set to 700mm*1000mm;

[0137] S30”: Adjust the gun distance L, where the gun distance L is the distance from the cup head to the grid plate, L=250±10mm;

[0138] S40”: Adjust the gun speed V, wherein the gun speed 500mm / s≤V≤700mm / s;

[0139] S50”: Adjust the pitch l, wherein the pitch is 80mm≤l≤100mm.

[0140] In this embodiment, the spraying programs of the paint robot, intermediate coat robot, and clear coat robot in the field are adjusted. The spraying area is set to 700mm*1000mm, and the gun distance is adjusted to the distance from the cup head to the grid plate, generally set to 250±10mm. The gun speed is set to 500-700mm / s, the pitch is set to 80-100mm, and the corresponding workpiece coordinates, machine model, brush table, and other information are set. To facilitate switching between different robots at any time during spraying, all robots in the same station have a spray plate program. In this embodiment, the paint robot is connected to the paint pump. This invention does not limit the specific model of the paint pump; users can choose according to their specific usage scenarios. Specifically, in this embodiment, a 2:1 pump or a 4:1 pump is selected, generally with a capacity of about 18L. To reduce paint usage and ensure output pressure and flow, one pump is connected to only one robot. In this way, not only can the paint spraying operation be completed, but also a large amount of paint to be inspected is not required, thereby avoiding the operational limitations caused by excessive paint loss.

[0141] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for confirming color difference in coatings, characterized in that, Includes the following steps: The paint to be tested is put into the paint pump and circulated for the first preset time. Provide at least two sets of electrophoresis plates, A and B. Set A of electrophoresis plates shall include at least three plates, A1, A2 and A3, and set B of electrophoresis plates shall include at least three plates, B1, B2 and B3. The paint robot is connected to the paint pump and sprays A1 and B1 with a first preset flow rate, A2 and B2 with a second preset flow rate, and A3 and B3 with a third preset flow rate. B1, B2 and B3 were placed on the outside of the test vehicle, and clear coat was applied to B1, B2 and B3 using a clear coat robot in the manner of body painting. Place A1, A2, and A3 inside the test vehicle; The test vehicle was placed in a paint baking oven to bake A1, A2, A3, B1, B2 and B3; Film thickness was measured for A1, A2 and A3 to obtain the first film thickness parameters of the electrophoresis plates in group A. Color difference tests were performed on B1, B2 and B3 to obtain the first color difference change parameters of the electrophoresis test plates in group B. Based on the first film thickness parameter and the first color difference change parameter, calculate the first correspondence between the color difference and film thickness of the paint to be tested; Based on the first correspondence, calculate the first actual color difference parameter of the paint to be tested under the standard film thickness; When the first actual color difference parameter is within the standard color difference parameter range, the paint to be tested is determined to meet the requirements and is put into the can for use. When the first actual color difference parameter is outside the range of the standard color difference parameter, the paint to be tested is subjected to color paste adjustment processing.

2. The method for confirming color difference in coatings according to claim 1, characterized in that, Before the step of connecting the paint robot to the paint pump and spraying A1 and B1 at a first preset flow rate, spraying A2 and B2 at a second preset flow rate, and spraying A3 and B3 at a third preset flow rate, the method further includes: Apply two shielding strips to A1, A2, and A3; Apply intermediate primer to A1, A2, A3, B1, B2, and B3; Remove one of the shielding strips from A1, A2, and A3 respectively.

3. The method for confirming color difference in coatings according to claim 2, characterized in that, Before the step of placing A1, A2, and A3 inside the test vehicle, the method further includes: Remove the other shielding strip from A1, A2, and A3 respectively.

4. The method for confirming color difference in coatings according to claim 2, characterized in that, The step of spraying intermediate primer onto A1, A2, A3, B1, B2, and B3 includes: Wipe A1, A2, A3, B1, B2, and B3 successively with an alcohol swab and an adhesive cloth; Place aluminum foil in the spraying area; Place A1, A2, A3, B1, B2, and B3 in the middle of the tin foil, with A1 and B1, A2 and B2, and A3 and B3 arranged side by side. A mid-coat robot was used to spray the mid-coat primer onto A1, A2, A3, B1, B2, and B3.

5. The method for confirming color difference in coatings according to claim 1, characterized in that, After the steps of connecting the paint robot to the paint pump and spraying A1 and B1 at a first preset flow rate, spraying A2 and B2 at a second preset flow rate, and spraying A3 and B3 at a third preset flow rate, and before the steps of placing B1, B2, and B3 on the outside of the test vehicle and spraying clear coat onto B1, B2, and B3 using a clear coat robot in the manner of body painting, the method further includes: A second preset flash-drying time is applied to A1, A2, A3, B1, B2, and B3; wherein, solvent-based coating lines flash-dry at room temperature, and water-based paint coating lines flash-dry by heating. Forcefully cool A1, A2, A3, B1, B2, and B3 to the preset temperature.

6. The method for confirming color difference in coatings according to claim 1, characterized in that, The steps of connecting the paint robot to the paint pump and spraying A1 and B1 at a first preset flow rate, A2 and B2 at a second preset flow rate, and A3 and B3 at a third preset flow rate include: A1 and B1, A2 and B2, and A3 and B3 are sprayed once each using the first preset flow rate, the second preset flow rate, and the third preset flow rate, respectively. Let it stand for the third preset time; A1 and B1, A2 and B2, and A3 and B3 are sprayed a second time using the first preset flow rate, the second preset flow rate, and the third preset flow rate, respectively.

7. The method for confirming color difference in coatings according to claim 1, characterized in that, After the step of adjusting the pigment paste of the paint to be tested when the first actual color difference parameter is outside the range of the standard color difference parameter, the following steps are included: Perform the above spraying operation steps using the adjusted paint to be inspected; Obtain the adjusted second film thickness parameters and second color difference variation parameters of the paint to be tested; Based on the second film thickness parameter and the second color difference change parameter, calculate the second correspondence between the color difference and film thickness of the adjusted paint to be tested; Based on the second correspondence, calculate the second actual color difference parameter of the paint to be tested after adjustment under the standard film thickness; Compare the second actual color difference parameter with the standard color difference parameter range; When the second actual color difference parameter is within the range of the standard color difference parameter, the adjusted paint to be tested is determined to meet the requirements and can be put into the can for use. If the second actual color difference parameter is outside the range of the standard color difference parameter, the adjusted paint to be tested is determined to be unsatisfactory and is taken out of service.

8. The method for confirming color difference in coatings according to claim 1, characterized in that, Before the step of circulating the paint to be tested in the paint pump for a first preset time, the method further includes: The initial color difference of the paint to be tested is obtained by comparing it with a standard paint to be tested. If the initial color difference is within the preset color difference parameter range, then the paint to be tested is determined to meet the entry inspection standard.

9. The method for confirming color difference in coatings according to claim 1, characterized in that, Before the step of circulating the paint in the paint pump for a preset time, the method further includes: The fourth preset time for stirring the paint to be tested; The stirred paint to be tested is added to the paint pump.

10. The method for confirming color difference in coatings according to claim 1, characterized in that, Prior to the step of connecting the paint robot to the paint pump, the method further includes: The spraying programs of the paint robot, intermediate coat robot, and clear coat robot were tested on site. Input information parameters, wherein the information parameters include workpiece coordinates, vehicle model, and brush table; Set up a spraying area, wherein the size of the spraying area is set to 700mm*1000mm; Adjust the gun distance L, where the gun distance L is the distance from the cup head to the grid plate, L = 250 ± 10 mm; Adjust the gun velocity V, wherein the gun velocity is 500mm / s≤V≤700mm / s; Adjust the pitch l, wherein the pitch is 80mm ≤ l ≤ 100mm.

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