CN116045791B - Metal paint coating thickness assessment method - Google Patents
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- 238000000576 coating method Methods 0.000 title claims abstract description 104
- 239000003973 paint Substances 0.000 title claims abstract description 99
- 239000011248 coating agent Substances 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 60
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 13
- 239000002184 metal Substances 0.000 title claims abstract description 13
- 238000005259 measurement Methods 0.000 claims abstract description 132
- 238000012360 testing method Methods 0.000 claims abstract description 82
- 238000005507 spraying Methods 0.000 claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 230000003595 spectral effect Effects 0.000 claims description 20
- 238000002310 reflectometry Methods 0.000 claims description 11
- 238000004364 calculation method Methods 0.000 claims description 10
- 230000002159 abnormal effect Effects 0.000 claims description 6
- 239000011087 paperboard Substances 0.000 claims description 4
- 230000003746 surface roughness Effects 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 14
- 238000012795 verification Methods 0.000 description 6
- 239000002131 composite material Substances 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
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- 238000011156 evaluation Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
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- 239000000463 material Substances 0.000 description 2
- 238000013178 mathematical model Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 229910001111 Fine metal Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000012625 in-situ measurement Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
- G01B7/10—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance
- G01B7/105—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance for measuring thickness of coating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/15—Correlation function computation including computation of convolution operations
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- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/18—Complex mathematical operations for evaluating statistical data, e.g. average values, frequency distributions, probability functions, regression analysis
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The application discloses a metallic paint coating thickness assessment method, which comprises the following steps: determining the allowable thickness value interval of the metallic paint coating to be measured on the surface of the product, and marking asThe method comprises the steps of carrying out a first treatment on the surface of the Manufacturing a plurality of measurement test plates according to the thickness value interval; the measuring test boards are used for spraying metal paint coatings with different thicknesses; dividing grids on the measurement test board, and respectively measuring the thickness value and the brightness value of the metallic paint coating to be measured in each grid; collecting measurement result data; performing function fitting on the measurement result data to establish a mathematical relationship model between the thickness value and the brightness value; and selecting a measuring part on the actual spraying surface of the product, and obtaining the actual thickness value of the measuring part according to the brightness value and the mathematical relation model.
Description
Technical Field
The application relates to the technical field of paint spraying thickness detection, in particular to a metal paint coating thickness assessment method.
Background
In the manufacturing industries of automobiles, airplanes and the like, paint spraying treatment is required to be carried out on the outer surface of a product so as to meet the requirements of high and low temperature resistance, corrosion resistance, long service life, attractive appearance and the like. The metal paint is a solidified paint coating prepared by adding fine metal filler into paint base stock, is one of the current very common top paint coatings, is generally aluminum sheet, is reflected back by the aluminum sheet through a paint film after light rays are incident on the aluminum sheet so as to form an anisotropic visual effect, and can be used for preparing an infrared low-emissivity coating so as to reduce the reflectivity of a target surface, and is also quite common in military.
From the aspect of the combination of the coatings, the paint layer applied to the outer surface of the product generally comprises a primer and a top coat, and even some performance coatings are added to form a composite coating with a multi-layer structure, namely, the actual coating is formed by sequentially applying and superposing a plurality of paint layers. The thickness of the coating is not only helpful to the guarantee and improvement of appearance quality, but also can indirectly evaluate the performances of wear resistance, corrosion resistance, flexibility, impact resistance, even adhesion of the coating, and the like, so the thickness of the coating is an important control element in the spraying process.
Currently, for a composite coating with a multi-layer structure, when the thickness of an outermost metallic paint coating needs to be measured independently after the coating of the multi-layer coating is finished on the surface of a product, the existing paint coating thickness measuring method or equipment has poor applicability and inaccurate measurement for the composite coating with the multi-layer structure.
Disclosure of Invention
The main purpose of the application is to provide a metallic paint coating thickness evaluation method, and aims to solve the technical problems that the applicability is poor and the measurement is inaccurate when the thickness of an outermost metallic paint coating layer is required to be measured independently for a composite coating layer with a multilayer structure in the existing measurement method.
To achieve the above object, the present application provides a method for evaluating thickness of a metallic paint coating, comprising the steps of:
determining the allowable thickness value interval of the metallic paint coating to be measured on the surface of the product, and marking as；
Manufacturing a plurality of measurement test plates according to the thickness value interval; the measuring test boards are used for spraying metal paint coatings with different thicknesses;
dividing grids on the measurement test board, and respectively measuring the thickness value and the brightness value of the metallic paint coating to be measured in each grid;
collecting measurement result data of the thickness value and the brightness value;
performing function fitting on the measurement result data to establish a mathematical relationship model between the thickness value and the brightness value;
and selecting a measuring part on the actual spraying surface of the product, and obtaining the actual thickness value of the measuring part according to the brightness value and the mathematical relation model.
Optionally, between the step of determining a thickness value interval allowed by the metallic paint coating to be measured on the surface of the product and the step of manufacturing a plurality of measurement test boards according to the thickness value interval, the method further comprises the following steps:
and carrying out covering capability test on the metallic paint coating to be tested to verify whether the metallic paint coating to be tested has enough covering capability.
Optionally, the covering capability test is performed on the metallic paint coating to be tested to verify whether the metallic paint coating to be tested has enough covering capability, including:
three black-and-white paperboard are selected and are respectively sprayed with the thickness of、/>、/>Is a metal paint of (2);
the spectral reflectivities of the metallic paint in the black areas on the three black-and-white cardboard were measured and respectively recorded as、/>、；
The spectral reflectivities of the metallic paint in the white areas on the three black-and-white cardboard were measured and respectively recorded as、/>、；
Calculating the spectral reflectance ratios of the three black and white cardboard, wherein the spectral reflectance ratios are respectively as follows:
；
；
；
and judging the calculation result.
Optionally, the determining the calculation result includes:
when meeting the requirementsWhen the method is used, the next step is carried out;
when not meetingAnd when the process is finished.
Optionally, the number of the measurement test plates is set asNThenThe method comprises the steps of carrying out a first treatment on the surface of the Wherein,,Kis an interpolation coefficient.
Alternatively, the process may be carried out in a single-stage,Kthe relationship between the value of (c) and the sprayed thickness on each measurement test panel is:
when (when)When (I)>The number of measurement panels is +.>The sprayed thickness of each of the measurement panels +.>The method comprises the following steps of: wherein,,i=1,2,3,4,5,6,7；
；
；
；
；
；
；
；
when (when)When (I)>The number of measurement panels is +.>The sprayed thickness of each of the measurement panels +.>The method comprises the following steps of: wherein,,i=1,2,3,4,5,6,7,8,9,10,11；
；
；
；
；
；
；
；
；
；
；
。
optionally, the dividing grids on the measurement test board, and measuring the thickness value and the brightness value of the metallic paint coating to be measured in each grid respectively includes:
dispersing the surface of the coating on the measurement test plate into a plurality of grids;
measuring the thickness value of the center of each grid by using an eddy current thickness meter, taking the average value of three measurements as a measurement result, and measuring not less than 25 thickness values on each measurement test plate;
and measuring the brightness value of the center of each grid by using a color difference meter, taking the average value of three measurements as a measurement result, and measuring not less than 25 brightness values on each measurement test board.
Optionally, the surface roughness of the measurement test plate isThe thickness of the measurement test plate is 1-2mm, the measurement test plate is square, and the length and width of the measurement test plate are +.>。
Optionally, each of the grids has a size ofThe method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>An observation aperture for the color difference meter; the number of the grids is +.>And->Not less than 25.
Optionally, between the step of collecting measurement data of the thickness value and the brightness value and the step of performing function fitting on the measurement data to establish a mathematical relationship model between the thickness value and the brightness value, the method further comprises the steps of:
and carrying out preliminary examination on the measurement result data to remove abnormal values in the data.
Optionally, the expression of the mathematical relationship model is:
；
wherein,,T A as the value of the thickness of the film,Min order for the value of the brightness to be,A，Band the parameter value obtained after the function fitting is carried out on the measurement result data.
The beneficial effects that this application can realize are as follows:
according to the method, according to the allowed thickness value interval of the metallic paint coating to be measured on the surface of the product, a plurality of measurement test boards sprayed with metallic paint coatings with different thicknesses are adopted for testing, so that experimental data of thickness values and brightness values of a plurality of groups of metallic paint coatings to be measured are measured, then a mathematical relationship model is built according to the experimental data, when components of the sprayed coating and the spraying process are not changed, the mathematical relationship model is unchanged, can be used for a long time, has good guidance, can select a measurement part on the actual sprayed surface of the product when actual measurement is carried out on the real object of the product, can rapidly and accurately calculate the actual thickness value of the measurement part according to the brightness values and the built mathematical relationship model, is simple to operate, is accurate to evaluate and has high efficiency, and is suitable for in-situ evaluation of the thickness of the metallic paint coating.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.
FIG. 1 is a schematic flow chart of a method for evaluating thickness of a metallic paint coating according to an embodiment of the present application;
FIG. 2 is a schematic overall flow chart of a method for evaluating thickness of a metallic paint coating according to an embodiment of the present application;
FIG. 3 is a schematic structural diagram of a measurement test plate according to an embodiment of the present application;
FIG. 4 is a graph of measurement data collected for thickness values and brightness values in an embodiment of the present application;
fig. 5 is a functional relationship diagram of measurement result data after performing functional fitting in the embodiment of the present application.
The realization, functional characteristics and advantages of the present application will be further described with reference to the embodiments, referring to the attached drawings.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present application are merely used to explain the relative positional relationship between the components, the movement condition, and the like in a specific posture, and if the specific posture is changed, the directional indicator is correspondingly changed.
In the present application, unless explicitly specified and limited otherwise, the terms "coupled," "secured," and the like are to be construed broadly, and for example, "secured" may be either permanently attached or removably attached, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be regarded as not exist and not within the protection scope of the present application.
Example 1
Referring to fig. 1-5, the embodiment provides a method for evaluating thickness of a metallic paint coating, comprising the following steps:
determining the allowable thickness value interval of the metallic paint coating to be measured on the surface of the product, and marking as；
Manufacturing a plurality of measurement test plates according to the thickness value interval; the measuring test boards are used for spraying metal paint coatings with different thicknesses;
dividing grids on the measurement test board, and respectively measuring the thickness value and the brightness value of the metallic paint coating to be measured in each grid;
collecting measurement result data of the thickness value and the brightness value;
performing function fitting on the measurement result data to establish a mathematical relationship model between the thickness value and the brightness value;
and selecting a measuring part on the actual spraying surface of the product, and obtaining the actual thickness value of the measuring part according to the brightness value and the mathematical relation model.
Currently, a coating thickness gauge is often used for measuring the thickness of a coating, and the type of the gauge generally comprises a magnetic induction mode and an eddy current mode, wherein the magnetic induction mode is used for measuring the thickness of a non-magnetic coating on a magnetic substrate, and the eddy current mode is used for measuring the thickness of a non-conductive coating on the non-magnetic substrate. In the manufacturing industries of automobiles, airplanes and the like, a metallic paint coating is generally coated on a non-magnetic substrate, and the substrate is mainly made of aluminum alloy materials, so that the measurement is mostly carried out in an eddy current mode. The eddy current thickness measurement method can measure the total thickness of the coating on the aluminum alloy substrate, but for the composite coating of the multilayer structure, when the thickness of the outermost metallic paint coating needs to be measured separately, the method cannot be realized, i.e. after the coating of the multilayer coating on the product surface is completed, no engineering in-situ measurement method or equipment is available for measuring the thickness of the outermost metallic paint coating separately.
Therefore, in this embodiment, according to the allowed thickness value interval of the metallic paint coating to be measured on the surface of the product, a plurality of measurement test boards coated with metallic paint coatings with different thicknesses are adopted to perform a test to measure experimental data of thickness values and brightness values of a plurality of groups of metallic paint coatings to be measured, and then a mathematical relationship model is built according to the experimental data.
The thickness value interval allowed by the metallic paint coating to be measured on the surface of the product is determined according to specific coating technical conditions. When the function fitting is carried out on the measurement result data, the least square method can be adopted for fitting, and the least square method is a mathematical tool widely applied to various data processing disciplines such as error estimation, uncertainty, system identification, prediction, forecast and the like. When the actual spraying surface of the product selects a measurement part, the specific selection position and the selection area size are selected according to the actual working condition, wherein the selection position comprises at least a plane position and a curved surface position, the selection area size is required to be larger than the minimum area required by measurement, for example, a plurality of measurement parts are respectively selected at the fuselage and wing parts of a certain type of airplane, the intervals among the measurement parts are dispersed, and the shape is as different as possible, so that the actual thickness value of each measurement part is obtained.
As an optional implementation manner, between the step of determining the allowed thickness value interval of the metallic paint coating to be measured on the surface of the product and the step of manufacturing a plurality of measurement test boards according to the thickness value interval, the method further comprises the following steps:
and carrying out covering capability test on the metallic paint coating to be tested to verify whether the metallic paint coating to be tested has enough covering capability.
In this embodiment, after determining the allowed thickness value interval of the metallic paint coating to be tested on the surface of the product, a covering capability verification procedure is performed on the metallic paint coating, so as to verify whether the metallic paint coating to be tested has enough covering capability, if the verification meets the requirement, the next step is entered, and if the verification does not meet the requirement, the process is ended, so as to ensure the accuracy of the test data.
The traditional covering capacity testing method comprises the steps of brushing a paint layer with a standard area on a standard black-and-white grating, then placing the brushed grating into a camera bellows, and judging whether the paint layer brushed at present can completely shade the background color of the black-and-white grating through visual observation under the irradiation of a specified light source and a specified angle: if the paint can be completely shielded, calculating the weight of the current paint layer, and marking the covering capacity through the weight of the paint to be used in unit area; if the black-and-white grating cannot be completely shielded, a layer of coating is continuously coated on the black-and-white grating, and then the color of the black-and-white grating can be completely covered by a visual method, so that the weight of the paint layer required to be coated in unit area is obtained.
Thus, as an alternative embodiment, the hiding power test of the metallic paint coating to be tested to verify whether the metallic paint coating to be tested has sufficient hiding power includes:
three black-and-white paperboard are selected and are respectively sprayed with the thickness of、/>、/>Is a metal paint of (2);
the spectral reflectivities of the metallic paint in the black areas on the three black-and-white cardboard were measured and respectively recorded as、/>、；
The spectral reflectivities of the metallic paint in the white areas on the three black-and-white cardboard were measured and respectively recorded as、/>、；
Calculating the spectral reflectance ratios of the three black and white cardboard, wherein the spectral reflectance ratios are respectively as follows:
；
；
；
and judging the calculation result.
In this embodiment, in operation, a coating material is applied to a black-and-white cardboard in a desired thickness, and after the coating film is dried, the reflectance value on the black-and-white background is measured by a reflectance meter, and the greater the ratio of the two is, the greater the hiding power is. By respectively spraying the thickness of the three black-white cardboard、/>、/>The minimum value, the intermediate value and the maximum value of the spraying thickness are all tested, then the reflectivity of the paint layer can be measured, compared and calculated through digital measuring instruments such as a reflectivity tester and the like, so that the spectral reflectivity ratio of the three black-white paperboard is obtained, and then whether the verification condition is met or not is judged according to the spectral reflectivity ratio.
The present embodiment includes at least a spray coating thickness of、/>、/>Gold of (2)Covering power verification of lacquer, during actual test, can be carried out at +.>More intermediate values are selected in the interval to improve verification accuracy. The black and white areas on the black and white cardboard are not limited in shape and arrangement, for example, black and white grids formed by a plurality of black and white blocks arranged in a staggered manner, or a plurality of black and white strips arranged in a staggered manner, but the areas of the black and white areas should be equal.
As an optional implementation manner, the determining the calculation result includes:
when meeting the requirementsWhen the method is used, the next step is carried out;
when not meetingAnd when the process is finished.
In the present embodiment, when three black-and-white cardboard spectral reflectance ratios、/>And->When the color of the lower-level coating is more than or equal to 98%, the coating of the metallic paint has enough hiding power, the color of the lower-level coating does not influence the color measurement structure of the metallic paint, and the next step can be continued; otherwise, if the requirement is not satisfied, the method is not suitable, and the flow is ended.
As an alternative embodiment, the number of the measurement test plates is set asNThenThe method comprises the steps of carrying out a first treatment on the surface of the Wherein,,Kis an interpolation coefficient. Setting interpolation coefficient when designing the number of measurement test boards to be sprayed>And the number of the measurement test plates can be calculated in a guiding way according to a calculation formula so as to meet the basic measurement requirement.
As an alternative to this embodiment of the present invention,Kthe relationship between the value of (c) and the sprayed thickness on each measurement test panel is:
when (when)When (I)>The number of measurement panels is +.>The sprayed thickness of each of the measurement panels +.>The method comprises the following steps of: wherein,,i=1,2,3,4,5,6,7；
；
；
；
；
；
；
；
when (when)When (I)>The number of measurement panels is +.>The sprayed thickness of each of the measurement panels +.>The method comprises the following steps of: wherein,,i=1,2,3,4,5,6,7,8,9,10,11；
；
；
；
；
；
；
；
；
；
；
。
in the present embodiment, the spray thickness interval is determinedIs determined by the difference of (3)KTakes on a value of 50umIs the critical point, if the difference is less than or equal to 50um，/>The number of the measurement test boards is 7, the thickness of the 7 measurement test boards to be sprayed is calculated according to the formula, and if the difference is more than 50umI.e. the range of the spraying thickness interval is larger, more measuring test boards are needed, and the number of the measuring test boards is increased>The number of the measurement test boards is 11, the thickness of the 11 measurement test boards to be sprayed is calculated according to the formula, the guidance is strong, the calculation is reasonable, and accurate and effective experimental data are provided for the establishment of a subsequent mathematical relationship model.
As an optional implementation manner, the dividing grids on the measurement test board, and measuring the thickness value and the brightness value of the metallic paint coating to be measured in each grid respectively includes:
dispersing the surface of the coating on the measurement test plate into a plurality of grids;
measuring the thickness value of the center of each grid by using an eddy current thickness meter, taking the average value of three measurements as a measurement result, and measuring not less than 25 thickness values on each measurement test plate;
and measuring the brightness value of the center of each grid by using a color difference meter, taking the average value of three measurements as a measurement result, and measuring not less than 25 brightness values on each measurement test board.
In this embodiment, the surface of the coating on the measurement test board is firstly scattered into a plurality of grids (according to the uniformity principle), then the thickness value of each grid center is measured by using an eddy current thickness meter, the brightness value of each grid center is measured by using a color difference meter, and each measurement test board is ensured to take at least 25 measurement values, and the average value of three measurements is taken as a measurement result, so that the accuracy of measurement data is further improved, and accurate and effective experimental data is provided for the establishment of a subsequent mathematical relationship model. Selecting results according to the number of measurement test boards to be sprayed, and measuring to obtain at leastOr->A thickness value, and measuring not less than +.>Or->And the brightness values.
Therefore, based on the last established mathematical relation model, the measurement on the real object of the product on the production site can be completed by only one portable color difference meter in the follow-up process of measuring the actual spraying surface of the product, the operation is simple, the time is saved, and the quick measurement of the thickness of the metal paint layer on the surface of the product after the spraying can be realized.
It should be noted that, the parameters of the color difference meter are set as follows: CIE-L a b color space, D65 illuminant, 10 ° observer, and SPIN (including specular light) modes.
As an alternative embodiment, the surface roughness of the measurement test plate is as followsThe thickness of the measurement test plate is 1-2mm, and the measurement test plate is squareShape, and the length and width dimensions of the measurement test plate are +.>。
In this embodiment, the measurement test board is manufactured according to the above manufacturing requirements, and the basic conditions for subsequent test detection of the measurement test board are satisfied, so as to improve the accuracy of measurement data.
As an alternative embodiment, each of the grids has a size ofThe method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>An observation aperture for the color difference meter; the number of the grids is +.>And->Not less than 25.
In the embodiment, the size of the grids can be designed according to the color difference meters with different specifications so as to ensure the accuracy of the measured data, the flexibility is high, and the number of the grids is according to the specificationAnd not less than 25 standards, satisfying the measurement requirements.
As an alternative embodiment, between the step of collecting the measurement data of the thickness value and the brightness value and the step of performing a function fit on the measurement data to build a mathematical relationship model between the thickness value and the brightness value, the method further comprises the steps of:
and carrying out preliminary examination on the measurement result data to remove abnormal values in the data.
In the embodiment, after the measurement result data is obtained, the abnormal value in the data is removed, so that the accuracy and the reliability of the data can be ensured, and a foundation is laid for the subsequent establishment of a true and reliable mathematical relationship model.
As an alternative embodiment, the expression of the mathematical relationship model is:
；
wherein,,T A as the value of the thickness of the film,Min order for the value of the brightness to be,A，Band the parameter value obtained after the function fitting is carried out on the measurement result data.
In this embodiment, according to the calculation expression of the mathematical relationship model, as long as the mathematical model between the thickness of the coating and the brightness value of the coating is not changed when the components and the spraying process of the metallic paint coating are not changed, the metallic paint coating can be used for a long time and has strong guidance.
Example 2
Referring to fig. 1-5, the embodiment provides a method for evaluating thickness of a metallic paint coating, comprising the following steps:
step S1: according to the technical conditions, the allowable thickness value interval of a metal paint coating of a certain model is；
Step S2: hiding ability test:
respectively spraying the thickness on 3 standard black-white cardboard、/>、/>Using a spectral reflectance measuring instrument to measure the spectral reflectance of the metallic paint of the black part on 3 standard black-and-white cardboard respectively>、/>、The spectral reflectivities of the metallic paint of the white part on 3 standard black-and-white cardboard were measured separately +.>、/>、/>The spectral reflectance ratios +.f. of 3 standard black-and-white cardboard were calculated, respectively>、/>、/>The following table shows:
as shown in the table, in the visible light wavelength (400-700 nm) range of the measuring instrument, the spectral reflectance ratio of 3 thicknesses is not less than 98%, and the metallic paint coating is considered to have enough hiding power, the color of the lower-level coating does not influence the color measurement result of the metallic paint, and the next step can be carried out;
step S3: and (3) manufacturing a measurement test plate:
the measuring test plate material is an aluminum alloy flat plate and has surface roughnessThe thickness of the sample plate is 2mm, the sample plate is square and the length and width dimensions thereof are +.>；
Because of，/>Calculating the spraying quantity of the measurement test plate>The spray thickness of each measurement panel +.>The calculation results are as follows:
；
step S4: and (3) collecting thickness value and brightness value data:
the spray surface on the measurement test plate is discretized into a plurality of grids according to the uniformity principle, and the color difference meter measuring equipment uses Ci60 type of Aishili companyNumber, observation apertureThe size of each grid ∈>Taking->The number of uniformly distributed grids contained on the test plate is measured>；
Measuring the thickness of each grid center of the test plate by using an eddy current thickness meter, taking the average value of three measurement values as a measurement result, and obtaining 36 thickness values by each test plate; measuring brightness values of each grid center of the test panels by using a color difference meter, taking an average value of three measurements as a measurement result, and obtaining not less than 36 brightness values for each test panel, namely 7 test panels in total, thereby obtainingThickness value->A plurality of brightness values (as shown in fig. 4);
step S5: outlier removal:
performing preliminary inspection on the measurement result data to remove abnormal jump points (namely abnormal values) caused by improper measurement and other reasons;
step S6: and (3) establishing a mathematical model:
fitting the measured result data by adopting least square regression to establish an actual thickness valueAnd lightness value->Functional relationship between (as shown in fig. 5):
；
step S7: in-situ evaluation of the paint layer thickness in the actual spraying process:
in the actual spraying process, after all the coatings are sprayed and dried, a color difference meter is used for measuring the brightness value of the part to be measured, and then the thickness value of the part is calculated according to the functional relation.
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the claims, and all equivalent structures or equivalent processes using the descriptions and drawings of the present application, or direct or indirect application in other related technical fields are included in the scope of the claims of the present application.
Claims (9)
1. A method for evaluating the thickness of a metallic paint coating, comprising the steps of:
determining the allowable thickness value interval of the metallic paint coating to be measured on the surface of the product, and marking as；
Performing a hiding power test on a metallic paint coating to be tested to verify whether the metallic paint coating to be tested has sufficient hiding power, comprising: three black-and-white paperboard are selected and are respectively sprayed with the thickness of、/>、/>Is a metal paint of (2); the spectral reflectivities of the metallic paint in the black areas on the three black-and-white cardboard were measured and respectively recorded as +.>、/>、The method comprises the steps of carrying out a first treatment on the surface of the The spectral reflectances of the metallic paints of the white areas on the three black-and-white cardboard were measured and respectively recorded as +.>、/>、/>The method comprises the steps of carrying out a first treatment on the surface of the Calculating the spectral reflectance ratios of the three black and white cardboard, wherein the spectral reflectance ratios are respectively as follows: />；/>；The method comprises the steps of carrying out a first treatment on the surface of the Judging the calculation result;
manufacturing a plurality of measurement test plates according to the thickness value interval; the measuring test boards are used for spraying metal paint coatings with different thicknesses;
dividing grids on the measurement test board, and respectively measuring the thickness value and the brightness value of the metallic paint coating to be measured in each grid;
collecting measurement result data of the thickness value and the brightness value;
performing function fitting on the measurement result data to establish a mathematical relationship model between the thickness value and the brightness value;
and selecting a measuring part on the actual spraying surface of the product, and obtaining the actual thickness value of the measuring part according to the brightness value and the mathematical relation model.
2. A method of evaluating the thickness of a metallic paint coating as recited in claim 1 wherein the determining of the calculation comprises:
when meeting the requirementsλ n When the percentage is more than or equal to 98%, entering the next step; wherein,,n=1,2,3；
when not meetingλ n When the flow is more than or equal to 98%, ending the flow; wherein,,n=1,2,3。
3. the method for evaluating the thickness of a metallic paint coating according to claim 1, wherein the number of the measurement test panels is set asNThenThe method comprises the steps of carrying out a first treatment on the surface of the Wherein,,Kis an interpolation coefficient.
4. A method for evaluating the thickness of a metallic paint coating according to claim 3,Kthe relationship between the value of (c) and the sprayed thickness on each measurement test panel is:
when (when)When (I)>The number of measurement panels is +.>The sprayed thickness of each of the measurement panels +.>The method comprises the following steps of: wherein,,i=1,2,3,4,5,6,7；
；
；
；
；
；
；
；
when (when)When (I)>The number of measurement panels is +.>The sprayed thickness of each of the measurement panels +.>The method comprises the following steps of: wherein,,i=1,2,3,4,5,6,7,8,9,10,11；
；
；
；
；
；
；
；
；
；
；
。
5. the method for evaluating thickness of metallic paint coating according to claim 1, wherein dividing grids on the measuring test board, and measuring thickness and brightness values of the metallic paint coating to be measured in each of the grids, respectively, comprises:
dispersing the surface of the coating on the measurement test plate into a plurality of grids;
measuring the thickness value of the center of each grid by using an eddy current thickness meter, taking the average value of three measurements as a measurement result, and measuring not less than 25 thickness values on each measurement test plate;
and measuring the brightness value of the center of each grid by using a color difference meter, taking the average value of three measurements as a measurement result, and measuring not less than 25 brightness values on each measurement test board.
6. A method for evaluating the thickness of a metallic paint coating according to claim 5, wherein the surface roughness of the test panel isThe thickness of the measurement test plate is 1-2mm, the measurement test plate is square, and the length and width of the measurement test plate are +.>。
7. A method of evaluating the thickness of a metallic paint coating as recited in claim 6 wherein each of said cells has a size ofThe method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>An observation aperture for the color difference meter; the number of the grids is +.>And->Not less than 25.
8. A method of evaluating the thickness of a metallic paint coating as recited in claim 1 wherein between the step of collecting measurement data for the thickness value and the brightness value and the step of functionally fitting the measurement data to establish a mathematical relationship model between the thickness value and the brightness value, further comprising the steps of:
and carrying out preliminary examination on the measurement result data to remove abnormal values in the data.
9. A method for evaluating the thickness of a metallic paint coating as recited in claim 1 or 8 wherein the mathematical relationship model is expressed as:
；
wherein,,T A as the value of the thickness of the film,Min order for the value of the brightness to be,A，Band the parameter value obtained after the function fitting is carried out on the measurement result data.
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