JPH08334320A - Apparatus for analyzing painting quality - Google Patents

Abstract

PURPOSE: To provide a painting quality-analyzing apparatus which can obtain an atomization degree according to a reference spraying distance quickly and highly accurately during painting even when a spraying distance is different for each part of an object to be painted. CONSTITUTION: A surface immediately after a painting is applied and therefore not dried is photographed by a photographing means 100. The image data are processed by an image-processing means 101, based on which a wavelength distribution of a rough waveform on the painted surface is calculated by a wavelength distribution-operating means 102. An atomization degree is calculated on the basis of the wavelength distribution by an atomization-operating means 103. The atomization degree is converted at a correcting/operating means 105 to a value responding to a reference spraying distance in accordance with spraying distance data input from a painting condition input means 104, whereby the atomization degree in conformity with the reference spraying distance is detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating quality analyzing apparatus for determining coating quality, that is, the degree of atomization of coating material.

[0002]

2. Description of the Related Art As a conventional method for measuring the size of paint particles in coating, that is, the degree of atomization of paint, a glass plate 51 specially coated with paint particles sprayed from a coating gun 50 is shown in FIG. There is a method of directly adhering to the above and measuring the particle size with an electron microscope or the like. Further, as another atomization degree measuring device, there is a laser Doppler type particle measuring device to which a laser Doppler velocimeter and a light scattering measuring technique are applied. This is to irradiate the coating particles sprayed from a coating gun with laser light and measure the particle diameter from the intensity of the scattered light of the particles.

[0003]

Since the degree of atomization of the coating material as described above has a great influence on the coating quality, it is necessary to control it precisely. Especially like car body painting,
When painting one after another in an automated painting line, it is necessary to feed back the quality of the painting as quickly as possible to improve the next painting condition and always maintain the best painting condition. However, the conventional method and apparatus for measuring the degree of atomization as described above is an analysis apparatus for research and cannot be applied to an automated coating line or the like due to the following problems. First of all, the method of attaching paint particles to the glass plate requires that a glass plate of the sample be prepared and observed with an electron microscope each time it is measured, so it takes man-hours and time, and feeds back to the coating process in real time. Is an inherently impossible method. In addition, the laser Doppler particle measuring device is also an analytical device for research, and when a flammable solvent is used as in a general coating process, it is difficult to use because it may be ignited by laser light. .

In order to solve the above-mentioned problems of the prior art, the present applicant takes an image of the undried coating surface after coating, finds the wavelength distribution of the unevenness of the coating surface from the optical image, and based on this, the coating material. Has invented a new coating quality analysis device configured to measure the particle size of the above, and has already applied for it (Japanese Patent Application No. 6-98483: unpublished). In the above-mentioned prior invention, the degree of atomization of the paint can be easily measured without contact during painting. Therefore, the coating conditions can be immediately feedback-controlled, so that the coating quality can be maintained and improved, and the number of man-hours for atomization measurement can be significantly reduced, which is an excellent effect.
However, the following problems remained in the actual painting process. That is, in the above prior invention, the wavelength distribution of the unevenness of the surface is obtained from the optical image of the painted surface, but in an automated line such as car body painting of an automobile, the spraying distance for each part according to the shape of the car body Since the (distance from the coating gun to the coating surface) is different, even if the coating gun is driven under the same coating conditions, the wavelength distribution on the coating surface will differ due to the difference in the collision speed of the coating particles depending on the difference in the distance. . Therefore, when the spraying distance differs depending on the painted part, if the atomization calculation is simply performed based on the uneven wavelength of the coating surface obtained from the image, an error based on the difference in the spraying distance occurs, which corresponds to the reference spraying distance. It may be difficult to accurately measure the atomization degree. Therefore, there is room for further improvement when applied to automated lines such as car body painting.

The present invention has been made in order to solve the problems of the prior art as described above and to improve the prior invention of the applicant of the present invention. Even if, during coating, it is an object of the present invention to provide a coating quality analysis device capable of quickly and highly accurately obtaining the atomization degree corresponding to the reference spraying distance.

[0006]

In order to achieve the above object, the present invention is constructed as described in the claims. FIG. 1 is a functional block diagram of the present invention. The invention according to claim 1 is, as shown in FIG. 1 (a), an image pickup means 100 for picking up an image of the undried coating surface immediately after applying the paint, and an image processing means for image-processing the image information from the image pickup means 100. 101, and a wavelength distribution calculation means 102 for calculating the wavelength distribution of the corrugated waveform on the coating surface based on the image processing data processed by the image processing means 101.
Atomization calculation means 103 for calculating the atomization degree based on the calculation result of the wavelength distribution calculation means 102, and a coating condition input for inputting a coating condition including at least a spraying distance between the paint spraying means and the surface of the object to be coated. Correction calculation means 1 for calculating the atomization degree at the reference spraying distance based on the means 104, the atomization degree calculated by the atomization calculation means 103, and the spraying distance input from the coating condition input means 104.
05 and. The above-mentioned means correspond to the following means in the embodiment of FIG. That is, the image pickup unit 100 is provided in the image pickup unit 2 and the image processing unit 1 is provided.
Reference numeral 01 denotes the image processing unit 3, wavelength distribution calculation unit 102 is the wavelength calculation unit 4, and atomization calculation unit 103 is the atomization calculation unit 6.
The coating condition input means 104 corresponds to the coating condition input section 5, and the correction calculation means 105 corresponds to the correction calculation section 7.

The invention according to claim 2 shows an example of the configuration of the correction calculation means 105, and the invention according to claim 3 is the actual spraying distance as shown in FIG. FIG. 1C shows an example of the configuration in which the distance measuring means 106 for measuring the distance is provided.
As shown in FIG. 3, the composition is provided with an atomization averaging means 107 for obtaining a corrected atomization degree at a plurality of points on the surface of the object to be coated and further averaging the atomization degrees.

[0008]

According to the invention described in claim 1, the wavelength distribution of the unevenness of the coated surface is obtained from the image of the undried coated surface after coating, and the particle diameter (atomization degree) of the coating material is measured based on the wavelength distribution and sprayed. The correction is performed according to the distance to calculate the atomization degree corresponding to the reference spraying distance.
With this configuration, the degree of atomization corresponding to the reference spraying distance can be easily measured without contact during coating. Therefore, since the coating conditions can be immediately feedback-controlled, the coating quality can be maintained and improved, and the number of man-hours for atomization measurement can be significantly reduced. The degree of atomization, that is, the degree of atomization of the paint particles, may be the particle size of the paint as it is, or may be expressed as the reciprocal thereof or a percentage with respect to a reference value. Also, since the actual spray distance is a value that depends on the shape of the object to be painted, if the shape of the object to be painted is known in advance, such as in a car painting line, the spray distance will depend on the progress of the line. It is known as a value that has been set, and that value may be input from the coating condition means 104. Further, the reference spraying distance may be given to the correction calculation means 105 in advance, or may be given from the coating condition input means 104.

Further, according to the third aspect of the present invention, the distance measuring means 106 for measuring the actual spraying distance is provided, and the spraying distance from the paint spraying means (for example, the coating gun) to the coating surface of the object to be coated is actually measured. It is configured to measure and use it as the blowing distance in the correction calculation unit 105. With such a configuration, it is possible to always perform the correction calculation using the accurate spray distance regardless of the shape of the object to be coated.

Further, the invention according to claim 4 is provided with the atomization averaging means 107, and is configured to calculate a value obtained by averaging the atomization degrees at a plurality of locations. In the case of an object to be coated having a large spraying area such as the body of an automobile, the coating conditions may not always be constant depending on the portion to be coated. Therefore, in order to perform accurate atomization measurement, multiple points on the coating surface are imaged, the degree of atomization is calculated for each of them, and the coating control is performed by using the value obtained by averaging those values. Can be improved.

[0011]

FIG. 2 is a first embodiment of the present invention and is a block diagram when the present invention is applied to a vehicle body painting line. First, the outline of the entire configuration will be described with reference to FIG. Reference numeral 1 denotes a vehicle body of a body to be coated, which is coated while moving on a coating line at a predetermined speed. Reference numeral 2 denotes an image pickup unit for picking up an image of the wet coating surface immediately after coating. The image is taken at a predetermined time (for example, 1 to 2 minutes) after spraying the paint. Therefore, the imaging unit 2
Is installed at a position where the vehicle body arrives after, for example, 1 to 2 minutes according to the moving speed of the coating line.

The image of the painted surface (details will be described later) taken by the image pickup unit 2 is subjected to image processing such as binarization by the image processing unit 3. The image processing unit 3 is composed of an image memory that stores image information and a computing device such as a computer. The image processing data processed by the image processing unit 3 is sent to the wavelength calculation unit 4. In this wavelength calculator 4,
A power spectrum frequency analysis (for example, fast Fourier transform processing: FFT) is performed, and a power spectrum PS (details described later) of the uneven waveform of the coating surface is calculated from the input image processing data. Further, the coating condition input unit 5 is an input means such as a keyboard, and includes an intermediate coating, a top coating base,
Enter information about the type of paint such as clear topcoat and the spray distance. Further, the atomization calculator 6 calculates the degree of atomization of the paint based on the coating condition from the coating condition input unit 5 and the wavelength value (peak wavelength of the wavelength distribution) obtained by the wavelength calculator 4. (Details below). Further, the correction calculation unit 7 calculates the atomization degree at the reference spraying distance based on the atomization degree calculated by the atomization calculation unit 6 and the spraying distance input from the coating condition input unit 5 (details will be described later).
The atomization degree converted into the reference spraying distance obtained as described above is displayed on the display device 8 such as a liquid crystal display device or a CRT display device to be presented to the worker, and is also sent to the coating condition control system 9. The operating conditions of the coating gun 10 (the discharge amount of the coating, the number of rotations of the bell, the air pressure, etc.) are controlled to be the optimum conditions for achieving the desired atomization degree. In addition, the wavelength calculation unit 4, the atomization calculation unit 6, and the correction calculation unit 7 described above.
Is an arithmetic unit such as a computer.

Next, the operation will be described. First, the image pickup unit 2 will be described. FIG. 3 is a cross-sectional view showing an example of the image pickup unit 2. As shown in FIG. 3, the basic configuration of the image pickup unit includes a light source 31, a bright / dark pattern plate 32, a reflecting mirror 33, a lens 34,
It consists of a CCD camera 35. The light and dark pattern plate 32 described above
Is an opaque plate (or a transparent plate on which opaque stripe patterns are printed at predetermined intervals) provided with linear slits at predetermined intervals (for example, 1 mm intervals). Then, a parallel light beam from the light source 31 is irradiated from an oblique direction of the coating surface through the bright / dark pattern plate 32, the reflecting mirror 33, and the lens 34 to form a striped pattern corresponding to the slit on the object to be coated. This striped pattern has a distorted waveform (a waveform as shown in FIG. 10, which will be described later) that is distorted according to the irregularities on the object to be coated. The reflected light is imaged by the CCD camera 35, and the distorted striped pattern, that is, the information of the surface roughness is input. Image information of the striped pattern as described above is subjected to image processing, and power spectrum frequency analysis (for example, fast Fourier transform processing: FFT) is performed to obtain the power spectrum PS.

FIG. 4 is a frequency characteristic diagram of the power spectrum PS, in which the vertical axis represents the power spectrum PS and the horizontal axis represents the frequency f (the reciprocal of the wavelength λ, f = 1 / λ). In FIG. 4, the first peak waveform is the power spectrum of the basic waveform due to the basic stripes corresponding to the slits, and the second peak waveform is the long-wavelength region (10
Power spectrum corresponding to ~ 1 mm), the third peak waveform is the uneven wavelength waveform in the middle wavelength region (1 to 0.1 mm).
The fourth peak waveform shows the power spectrum corresponding to the short wavelength region (0.1 mm or less) of the uneven waveform. In the above power spectrum waveform, the peak wavelength in the long wavelength region of the concave-convex waveform, that is, the wavelength corresponding to the peak value of the second peak waveform, has a correlation with the atomization degree as described below, and thereby the atomization degree is changed. It can be measured.

Next, the principle of the atomization degree measurement in the atomization calculator 6 will be described. First, with reference to FIG. 5, the process of adhering paint particles to the coating surface and forming the coating film surface during coating will be described. As shown in FIG. 5A, atomized paint particles are sprayed from the paint gun 50 toward the paint surface (undercoat steel plate 52). At this time, the average particle size of the paint particles is basically determined by the paint conditions such as paint velocity (below), air velocity (below) and paint physical properties (below). However, the above-mentioned items are as follows. Discharge rate of coating gun Bell rotation speed of coating gun Applied voltage Air pressure Paint physical properties (viscosity, surface tension, density) Bell rotation speed is the rotation speed of the rotating body that atomizes the paint, and applied voltage is the paint It is a static voltage (about 50 kV) applied to add static electricity to the particles, and the air pressure is an atmospheric pressure for creating a wall of airflow around the paint particles so that the paint particles do not scatter around. The paint particles sprayed as described above collide with the painted surface and adhere in a crushed form.

Next, as shown in FIG. 5 (b), in the initial stage of film formation, the small paint particles that have adhered are combined with the large paint particles to form larger particles. Then, the bonding of particles further progresses, and the initial coating film surface is formed by the surface tension and the boundary tension. As described above, since the coating film is formed by the adhesion and bonding of the particles, the initial coating film surface condition is the particle diameter r of the large coating particles, the particle collision velocity vx,
It depends on the physical properties of the coating (surface tension γ, viscosity η) and the like. For example, in the case of a top coating, the height of the unevenness on the surface of the initial coating film is about several to several tens of μm, and the wavelength distribution of the unevenness is 3 to 6 μm.
It was confirmed that the long wavelength region of about mm is dominant. It was confirmed by experiments that there is a correlation between the peak wavelength λ in the long wavelength region and the particle diameter r of large paint particles.

Next, as shown in FIG. 5C, the surface of the coating film after the above initial coating film formation has a leveling force (surface tension γ
And synthetic force of gravity g)).
This flattening speed is determined by the above-mentioned leveling force, coating material properties (surface tension γ, viscosity η) and film thickness h. For example, in the case of a topcoat paint, it has been confirmed that the flattening speed is a time constant of several tens of seconds to several hundreds of seconds.

Next, the relationship between the paint particle diameter and the unevenness of the coating film surface will be described in detail with reference to FIGS. As shown in FIG. 6, the particle diameter of the coating particles (flying particles 53) sprayed from the coating gun is r, the width of the adhered particles 54 adhered thereto is λ / 2, and the thickness (peak value) is h. if,
A coating film surface having irregularities of wavelength λ is formed. Note that the relationship between the width λ / 2 of the adhered particles and the wavelength λ is experimentally obtained, and it has been confirmed that the value has a value in this range. The paint particle diameter r in the above case is expressed by the following (Formula 1).

[0019]

[Equation 1]

When the above theoretical formula is shown in a graph, it becomes a curve as shown by the broken line in FIG. However, in reality, since the adhered particles are bonded, the characteristics shown by the solid line in FIG. 7 are obtained. The characteristic obtained by this experiment is expressed by a mathematical expression as shown in the following (Equation 2).

[0021]

[Equation 2]

Where ks: correction coefficient λp: peak wavelength of irregularities on the coating surface (corresponding to the peak wavelength of the long-wavelength region) a, β: constant peak wavelength λp of irregularities obtained by the above-mentioned experiment and paint particle diameter The relationship with r is analyzed in consideration of the bond of adhered particles. First, as shown in FIG. 8, the adhering particle diameter R gradually increases as the coating time increases. When this relationship is shown by a mathematical expression, it becomes as shown in the following (Equation 3).

[0023]

(Equation 3)

However, R ₀ : initial particle diameter b, c: constants In FIG. 8, the coating time is the duration of coating at one location, the initial particle diameter is the coating particle diameter before adhesion, and The particle size is the particle size when first attached. The diameter R of the adhered particles gradually increases as the coating time increases because the particles that are sequentially coated combine.

FIG. 9 is a characteristic diagram comparing the relationship between the coating time and the wavelength of unevenness on the coating surface with the measured value (broken line) and the result obtained from the power spectrum by frequency analysis. As can be seen from FIG. 9, the value obtained from the power spectrum is in good agreement with the actually measured value. Therefore, the particle diameter R of the adhered particles can be obtained by using the uneven wavelength (peak wavelength λp of the long wavelength) obtained from the power spectrum.
Further, in an automatic coating machine, the coating time is constant, so that the paint particle diameter r can be calculated by the following equation (4). 2r (t) = λp (t) (Equation 4) Based on the above consideration, the peak wavelength λp of the long wavelength region of the unevenness obtained from the power spectrum is basically used by the equation (Equation 2). The paint particle diameter r can be obtained. Specifically, if the characteristics shown in FIG. 7 are obtained by an experiment and then the respective coefficients ks, a, and β of the equation (2) are obtained in advance, the paint particle diameter is calculated using the peak wavelength λp obtained from the captured image. It is possible to obtain r. Since the particle size r of the paint particles corresponds to the degree of atomization of the paint, the particle size r of the paint particles may be used as it is to represent the degree of atomization, or the reciprocal of r or a reference value. It is also possible to express the degree of atomization by using the percentage and the like.

In the embodiment shown in FIG. 2, the wavelength calculator 4 is used.
Then, the power spectrum PS of the corrugated waveform on the coating surface is obtained from the input image processing data, and the peak wavelength λp in the long wavelength region is calculated. Then, in the atomization calculation unit 6, the particle diameter r of the paint particles is calculated from the corrected peak wavelength λp using the characteristic (Equation 2) of FIG. 7 previously obtained in the experiment, and the atomization degree is calculated from the value. To do. Note that in the above calculation, the characteristics of FIG. 7 differ depending on the type of paint, so depending on the type of paint such as intermediate coating, topcoat base, clear topcoat, etc. input from the coating condition input section 7 (Equation 2) Change the coefficient value of the expression.

Next, the correction calculation of the atomization degree according to the spraying distance in the correction calculation unit 7 will be described. Figure 11
In the adhesion mechanism of the paint particles as shown in, the spraying distance L between the coating gun and the surface to be coated is changed,
The result of measuring the adhered particle diameter r on the coated surface in that case is as shown in FIG. 10, and it was found that r is expressed as the function of L by the following formula (Equation 5). r = d × L + f (Equation 5) However, d and f: constants In general, when the paint conditions are constant, the paint particle size at the time of adhesion is the degree of enlargement due to particle bonding during paint flight and the collision of paint particles. It is determined by the combination with the degree of collapse of the particles due to the decrease in the velocity v. In the example of the air spray gun, the degree of enlargement due to the bond of paint particles during flight exceeds the degree of decrease in the collision speed v of paint particles, so the adhered particle diameter r increases as the spray distance (particle flight distance) increases. Become. Since the adhered particle diameter r (the degree of atomization) corresponds to the wavelength λ of the coating film surface, the spraying distance L and the wavelength λ (the peak wavelength of the long wavelength region in the wavelength distribution of the irregularities on the coating surface) The relationship with and can also be expressed as in the following (Equation 6).

Λ = a ′ × L + b ′ (Equation 6) where a ′ and b ′ are constants As described above, the degree of atomization of adhered particles depends on the spraying distance L, so that when the spraying distance is different. Needs to perform the atomization degree correction corresponding to the reference spraying distance.

Based on the relationship of the above equation (5), the correction equation for obtaining the atomization degree r'corresponding to the reference spraying distance L ₀ is
It is expressed by the following equation (7). r ′ = r + d × (L−L ₀ ) ... (Equation 7) As described above, the characteristic of FIG. By calculating the degree of atomization, it is possible to accurately calculate the degree of atomization at the reference spraying distance, even in the case of an object to be coated having a different spraying distance, thereby enabling precise control of coating. .

Actually, as described in the atomization calculation, the atomization degree is calculated based on the peak wavelength λp in the long wavelength region in the wavelength distribution of the unevenness of the coating film surface. As r in the equation (7) for obtaining a considerable atomization degree, the atomization degree obtained based on λp as described above may be used. In the embodiment of FIG. 2, in the correction calculation unit 7, based on the spraying distance L input from the coating condition input unit 5 and the atomization degree r input from the atomization calculation unit 6, the equation (7) is calculated. The calculation is performed to calculate the atomization degree r ′ corresponding to the reference spraying distance L ₀ .

Since the actual spraying distance L has a value corresponding to the shape of the object to be coated, when the shape of the object to be coated is known in advance, such as a car painting line, the spraying distance L is the line. The value is known as a value according to the progress status of, and the value may be input from the coating condition input unit 5.
Further, as described in a second embodiment described later, a device for measuring an actual spraying distance may be provided. Further, the reference spraying distance L ₀ may be given to the correction calculation unit 7 in advance, or may be given from the coating condition input unit 5.

As described above, in the present embodiment, the wavelength distribution of the unevenness of the coating surface was obtained from the image of the undried coating surface after coating, and the particle diameter of the coating material sprayed from the coating gun was measured based on the wavelength distribution. In addition, the correction is performed according to the spraying distance to calculate the atomization degree corresponding to the reference spraying distance. With this configuration, the degree of atomization corresponding to the reference spraying distance can be easily measured without contact during coating. Therefore, the coating conditions can be immediately feedback-controlled, so that the coating quality can be maintained and improved, and
The man-hour for atomization measurement can be significantly reduced.

Next, FIG. 12 is a block diagram of a second embodiment of the present invention. In this embodiment, a distance sensor 11 for measuring the actual spraying distance is provided, and the spraying distance from the coating surface 1 of the object to be coated flowing through the coating automation line to the coating gun 10 is actually measured and the correction calculation is performed. It is configured to be used as the spraying distance L in the portion 7. With the above configuration, the correction calculation can always be performed using the accurate spray distance L regardless of the shape of the object to be coated. Other configurations and effects are similar to those of the embodiment shown in FIG. Since the mutual relationship between the coating gun 10 and the imaging unit 2 is constant, the distance sensor 1
1 may be provided together with the imaging unit 2. Further, as the distance sensor 1, for example, an ultrasonic type or laser type distance measuring device can be used.

Next, FIG. 13 is a block diagram of a third embodiment of the present invention. In this embodiment, an averaging unit 12 is provided and an average value of the atomization degrees at a plurality of locations is calculated. In the case of an automated coating line such as car body painting, the spraying area is large, so the coating conditions may not always be constant depending on the coating site. Therefore, in order to perform accurate atomization measurement, multiple points on the coating surface are imaged, the degree of atomization is calculated for each of them, and the coating control is performed by using the value obtained by averaging those values. Can be improved. Other configurations and effects are similar to those of the embodiment shown in FIG. Although FIG. 13 illustrates the case where the average processing unit 12 is provided in the embodiment of FIG. 2, the average processing unit 12 may be combined with the embodiment of FIG.

[0035]

As described above, in the present invention, the wavelength distribution of the unevenness of the coating surface is obtained from the image of the undried coating surface after coating, the particle diameter of the coating material is measured based on the wavelength distribution, and the spraying distance is set. By performing the correction according to the calculation to calculate the atomization degree corresponding to the reference spraying distance, the atomization degree corresponding to the reference spraying distance can be easily measured in a non-contact manner during coating. Therefore, the coating conditions can be immediately feedback-controlled, so that the coating quality can be maintained and improved, and the number of man-hours for atomization measurement can be significantly reduced.
The effect is obtained.

Further, as described in claim 3, the object to be coated is one in which the distance measuring means is provided, the spraying distance is actually measured, and the value is used as the spraying distance in the correction calculating means. Regardless of the shape of
The correction calculation can always be performed using the accurate spray distance. Further, as described in claim 4, in the one configured to calculate the averaged value of the atomization degree at a plurality of locations, the coating area where the spraying area is large and the coating condition is not always constant depending on the coating site. It is possible to obtain an effect that accurate atomization measurement can be performed even on a coated object.

[Brief description of drawings]

FIG. 1 is a functional block diagram of the present invention.

FIG. 2 is a block diagram of an embodiment of the present invention.

FIG. 3 is a cross-sectional view showing an example of an imaging unit 2.

FIG. 4 is a frequency characteristic diagram of a power spectrum PS.

FIG. 5 is a diagram showing a process of coating material particles adhering to a coating surface and forming a coating film surface during coating.

FIG. 6 is a diagram showing a relationship between paint particles and adhered particles during flight.

FIG. 7 is a characteristic diagram showing the relationship between the average diameter of paint particles and wavelength.

FIG. 8 is a characteristic diagram showing the relationship between the particle size of the coating material and the coating time.

FIG. 9 is a characteristic diagram showing the relationship between wavelength λ and coating time.

FIG. 10 is a characteristic diagram showing a relationship between a spraying distance L and an adhered particle diameter r on a coated surface.

FIG. 11 is a schematic diagram showing a state in which the relationship between the spray distance L and the adhered particle diameter r on the coated surface is measured.

FIG. 12 is a block diagram of a second embodiment of the present invention.

FIG. 13 is a block diagram of a third embodiment of the present invention.

FIG. 14 is a diagram showing an example of a conventional atomization degree detection method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Body to be coated (body) 10 ... Coating gun 2 ... Imaging part 11 ... Distance sensor 3 ... Image processing part 12 ... Average processing part 4 ... Wavelength calculating part 50 ... Coating gun 5 ... Coating condition input part 51 ... Glass plate 6 ... atomization calculation unit 52 ... undercoat steel plate 7 ... correction calculation unit 53 ... flying particles 8 ... indicator 54 ... adhered particles 9 ... coating condition control system 100 ... imaging unit 104 ... coating condition input unit 101 ... image processing unit 105 ... correction Calculation means 102 ... Wavelength distribution calculation means 106 ... Distance measuring means 103 ... Atomization calculation means 107 ... Atomization average processing means

Claims (4)

[Claims] 1. An image pickup means for picking up an image of the undried coating surface immediately after applying a paint, an image processing means for image-processing the image information from the image pickup means, and image processing data processed by the image processing means. Based on the wavelength distribution calculation means for calculating the wavelength distribution of the uneven waveform of the coating surface, the atomization calculation means for calculating the atomization degree based on the calculation result of the wavelength distribution calculation means, the paint spraying means and the object to be coated. A coating condition input means for inputting a coating condition including at least a spray distance to the surface, and a reference spray distance based on the atomization degree calculated by the atomization calculation means and the spray distance input from the coating condition input means. A coating quality analysis device comprising: a correction calculation unit for calculating the degree of atomization. 2. The correction calculation means converts the measured atomization degree into an atomization degree corresponding to the reference spraying distance based on the relationship between the spraying distance previously obtained by an experiment and the wavelength distribution of the corrugated waveform on the painted surface. The coating quality analysis device according to claim 1, wherein the coating quality analysis device comprises: 3. A distance measuring means for measuring a spray distance between the paint spraying means and the surface of the object to be coated, wherein the correction calculating means is the atomization degree calculated by the atomizing calculating means and the distance measuring means. The atomization degree at the reference spraying distance is calculated based on the spraying distance measured in (1) or (2).
The coating quality analysis device described in. 4. The atomization calculation means calculates the degree of atomization at a plurality of points on the surface of the article to be coated, and the correction calculation means corrects each of these values to obtain the surface of the article to be coated. A method for calculating a corrected atomization degree at a plurality of locations, further comprising an atomization average processing means for averaging the corrected atomization degrees at a plurality of locations on the surface of the coating object. The coating quality analysis device according to any one of claims 1 to 3.