Surface treatment equipment and process for metal panel

Abstract

The invention relates to the technical field of metal panel polishing, and in particular to a surface treatment device and a treatment process for a metal panel. Firstly, a polishing grayscale image after each work process at each polishing position is analyzed to measure the excellence of the rotation speed effect from the panel morphology dimension; then a more accurate rotation speed adjustment value is further determined according to the change of the grinding wheel rotation speed in the historical work process and the change of the excellence of the rotation speed effect, so that the grinding wheel rotation speed of each polishing position is adaptively adjusted according to the rotation speed adjustment value, thereby solving the problem that when a fixed-speed grinding wheel is used to polish metal panels for different purposes, there is usually a significant difference between the optimal rotation speed that the metal material of some metal panels can adapt to and the fixed rotation speed of the grinding wheel, resulting in uneven polishing, surface thermal deformation and other problems on the surface of the metal plate after polishing, so that the polishing effect of the metal panel is better.

Description

Technical Field

[0001] The invention relates to the technical field of metal panel polishing, and in particular to a surface treatment device and a treatment process for a metal panel. Background Art

[0002] Metal laser engraving technology, also known as laser engraving or laser marking, is a technology that uses high-energy laser beams to perform non-contact processing on metal surfaces. Laser engraving technology can improve the functionality of metal plates, so metal laser engraving technology is often used in the production of control panels such as air-conditioning thermostats and refrigerator door touch panels. Among them, the metal panel is the base material of metal laser engraving technology, and its surface flatness directly affects the laser engraving effect. Therefore, it is often necessary to polish the original metal plate and perform a series of surface treatment processes to improve its surface quality, thereby better improving the laser engraving accuracy of the metal panel.

[0003] Existing metal panel polishing technology often uses mechanical polishing method. The mechanical polishing method fixes the metal panel through a clamping device and polishes the metal panel through a grinding wheel with a fixed speed. During the polishing process, a polishing liquid with a certain flow rate is simultaneously added to the polishing area of ​​the metal panel to cool the grinding wheel temperature during work and wash away the metal debris produced during the polishing process, thereby realizing the polishing process of the metal panel.

[0004] However, the metal materials of metal panels for different purposes are different, and the optimal rotation speeds that different metal materials can adapt to are different; therefore, when a fixed-speed grinding wheel is used to polish metal panels for different purposes, it is usually found that the optimal rotation speed that the metal material of some metal panels can adapt to is significantly different from the fixed rotation speed of the grinding wheel, resulting in problems such as uneven polishing and surface thermal deformation on the surface of the metal plate after polishing, resulting in a poor polishing effect on the metal panel. Summary of the invention

[0005] The present application provides a surface treatment device and a treatment process for a metal panel. The present application first analyzes the polishing grayscale image after each work process at each polishing position, and measures the excellence of the speed effect from the panel morphology dimension; then further determines a more accurate speed adjustment value according to the change of the grinding wheel speed in the historical work process and the change of the excellence of the speed effect, so as to adaptively adjust the grinding wheel speed at each polishing position according to the speed adjustment value, thereby solving the problem that when a fixed-speed grinding wheel is used to polish metal panels for different purposes, there is usually a significant difference between the optimal speed that the metal material of some metal panels can adapt to and the fixed speed of the grinding wheel, resulting in uneven polishing, surface thermal deformation and other problems on the surface of the metal plate after polishing, so that the polishing effect of the metal panel is better.

[0006] In a first aspect, the present application provides a surface treatment process for a metal panel, comprising the following steps:

[0007] During the polishing process of the metal panel, a grayscale image of the polished surface of each polishing site after each work process is completed and a height data value corresponding to each pixel point in the grayscale image of the polished surface are collected;

[0008] In the polishing surface grayscale image, the rotation speed effect excellence of each polishing site in each working process is determined according to the grayscale value distribution disorder of all pixel points and the height data value distribution disorder;

[0009] Based on the change of the grinding wheel speed before each working process at each polishing position and the change of the corresponding speed effect excellence, the speed adjustment value of each polishing position at each working process is determined;

[0010] The adaptive grinding wheel speed of each working process is determined according to the speed adjustment value; and the metal panel is polished according to the adaptive grinding wheel speed.

[0011] Furthermore, the process of obtaining the rotation speed effect excellence includes:

[0012] Calculate the mean grayscale value of all pixels in the grayscale image of the polished surface; determine the local grayscale standard deviation of each pixel according to the difference between the grayscale value of each pixel and the mean grayscale value; take the mean of the local grayscale standard deviation of all pixels in the grayscale image of the polished surface as the panel unevenness degree after each work process at each polishing site;

[0013] According to the overall fluctuation of the height data values ​​corresponding to all pixel points, the panel deformation degree after each work process at each polishing site is determined;

[0014] The excellence of the rotation speed effect at each polishing position after each work process is completed is determined according to the panel unevenness and the panel deformation; the panel unevenness and the panel deformation are negatively correlated with the excellence of the rotation speed effect.

[0015] Furthermore, the process of obtaining the panel deformation degree includes:

[0016] Calculate the mean value of the height data values ​​of all pixels in the grayscale image of the polishing surface; determine the local height standard deviation of each pixel based on the difference between the height data value corresponding to each pixel and the mean value of the height data value; determine the degree of panel deformation at each polishing site after each work process is completed based on the mean value of the local height standard deviation of all pixels in the grayscale image of the polishing surface.

[0017] Furthermore, the process of determining the excellence of the rotation speed effect of each polishing position after each work process is completed according to the unevenness of the panel and the deformation of the panel includes:

[0018] The product of the panel unevenness and the panel deformation is normalized by negative correlation, and the rotation speed excellence of each polishing site after each work process is completed is determined.

[0019] Furthermore, the process of obtaining the speed adjustment value includes:

[0020] At each polishing site, each work process is sequentially used as a target process, the first work process before the target process is used as a first reference process, and the second work process before the target process is used as a second reference process;

[0021] Determine the direction adjustment value of the target process according to the relative size of the grinding wheel rotation speed between the first reference process and the second reference process and the relative size of the rotation speed effect excellence;

[0022] Determine the speed adjustment weight of the target process according to the speed effect excellence deviation between the first reference process and the second reference process and the overall change of the speed effect excellence of all working processes before the target process;

[0023] The speed adjustment value of the target process is determined according to the product of the direction adjustment value, the speed adjustment weight and the a priori rated grinding wheel speed.

[0024] Furthermore, the process of obtaining the direction adjustment value includes:

[0025] The difference between the grinding wheel speed of the first reference process and the grinding wheel speed of the second reference process is used as the first reference difference; the difference between the speed effect excellence of the first reference process and the speed effect excellence of the second reference process is used as the second reference difference; the product of the first reference difference and the second reference difference is used as the direction determination value;

[0026] When the direction determination value is greater than 0, the direction adjustment value of the target process is set to a preset first direction value; the preset first direction value is greater than 0;

[0027] When the direction determination value is less than 0, the direction adjustment value of the target process is set to a preset second direction value; the preset second direction value is less than 0;

[0028] When the direction determination value is equal to 0, the direction adjustment value of the target process is set to 0.

[0029] Furthermore, the process of obtaining the speed adjustment weight includes:

[0030] The difference between the rotation speed effect excellence of the first reference process and the rotation speed effect excellence of the second reference process is used as the rotation speed effect deviation value;

[0031] A two-dimensional coordinate system is constructed with the speed effect excellence as the ordinate and the work process index value as the abscissa; a least squares fitting is performed on all coordinate points corresponding to all work processes before the target process in the two-dimensional coordinate system to determine a reference fitting straight line corresponding to the target process; a least squares fitting is performed on all coordinate points corresponding to all work processes before the first reference process in the two-dimensional coordinate system to determine a reference fitting straight line corresponding to the target process; a positive correlation mapping is performed on the difference between the slope of the reference fitting straight line and the slope of the reference fitting straight line to determine a reference trend impact value;

[0032] The speed adjustment weight of the target process is determined according to the reference trend influence value and the speed effect deviation value; the reference trend influence value and the speed effect deviation value are both positively correlated with the speed adjustment weight.

[0033] Further, the process of determining the speed adjustment weight of the target process according to the reference trend influence value and the speed effect deviation value includes:

[0034] The product of the reference trend impact value and the speed effect deviation value is normalized to determine the speed adjustment weight of the target process.

[0035] Furthermore, the process of obtaining the adaptive grinding wheel speed includes:

[0036] The sum of the grinding wheel rotation speed of the previous working process of each working process and the rotation speed adjustment value is used as the adaptive grinding wheel rotation speed of each working process.

[0037] The present application also proposes a surface treatment device for a metal panel, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, any step of a surface treatment process for a metal panel is implemented.

[0038] This application has the following beneficial effects:

[0039] This application takes into account that setting an unreasonable grinding wheel speed will cause poor polishing surface treatment effect, so the polishing treatment effect is analyzed after a single work process is completed; considering that when the polishing effect is poor, there will be metal panel morphology problems such as uneven polishing and surface thermal deformation, so in the dimension of panel morphology, combined with the grayscale distribution chaos in the grayscale image of the polished surface and the distribution chaos of the height data value, the speed effect is measured. Then, according to the change in the speed effect excellence after the speed change before each work process, the speed adjustment value corresponding to each work process is determined, which characterizes the speed adjustment direction and adjustment range; thereby determining the adaptive grinding wheel speed of each work process according to the speed adjustment value; and using this to perform the adaptive grinding wheel speed of each subsequent polishing position, and use the adaptive grinding wheel speed to perform metal panel polishing with better effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 A flow chart of a data processing process of a surface treatment process of a metal panel provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of a surface treatment device and treatment process of a metal panel proposed by the present invention, its specific implementation method, structure, characteristics and effects, in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment, and the specific features, structures or characteristics in one or more embodiments may be combined in any suitable form. In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be understood as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0043] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0044] The following is a detailed description of a surface treatment device and a specific treatment process for a metal panel provided by the present invention in conjunction with the accompanying drawings.

[0045] The present application embodiment provides a surface treatment process for a metal panel. Figure 1 , which shows a flow chart of a data processing process of a surface treatment process of a metal panel provided by an embodiment of the present invention, including the following steps:

[0046] Step S101: during the polishing process of the metal panel, a polishing surface grayscale image of each polishing site after each work process is completed and a height data value corresponding to each pixel point in the polishing surface grayscale image are collected.

[0047] Considering that the ultimate goal of this application is to polish the surface of the metal panel by mechanical polishing, the polishing scene should be configured first, specifically:

[0048] First, four clamping devices are used to fix the metal panel on the operating platform to facilitate grinding wheel processing; because the range of action of the grinding wheel is regional, the metal panel is divided into multiple polishing sites, and it should be ensured that the polishing site area of ​​the metal panel is smaller than the range of action of the grinding wheel; in a specific implementation method of an embodiment of the present invention, the polishing sites are evenly distributed on the surface of the metal panel, so that the range of action of the grinding wheel corresponding to each polishing site area can cover the metal panel. The embodiment of the present invention sets the number of polishing sites to 15, which can be adjusted according to the specific implementation environment. A grinding wheel working path is further formulated to ensure that the working path of the grinding wheel can cover all polishing sites of the metal panel; for a single polishing site of the metal panel, a main working robot arm and two auxiliary robot arms are arranged above it, a grinding wheel is installed on the main working robot arm, and a speed control module is installed on the grinding wheel and the main working robot arm at the same time, so that the speed of the grinding wheel can be adjusted in real time; a polishing liquid injection device is installed on one of the auxiliary robot arms, and polishing liquid is sprayed on the polishing site when the grinding wheel is working, which plays a role in cooling the grinding wheel and removing metal waste slag; a two-port conversion head is installed on the other auxiliary robot arm, wherein a laser rangefinder is installed on one port of the conversion head, and an industrial camera is installed on the other port; when the main working robot arm completes a working process, the main working robot arm is lifted, and the industrial camera on the auxiliary robot arm collects images of the surface of the polishing site, and obtains a grayscale image of the polishing surface of each polishing site after each working process; and then the height data value of each point on the polishing site to the laser rangefinder is converted to the laser rangefinder to collect, that is, the height data value corresponding to each pixel point in the grayscale image of the polishing surface of each polishing site after each working process is collected.

[0049] When the auxiliary robot arm completes data collection, the main working robot arm resumes its working position and continues the next working process. The adaptive grinding wheel speed of the next working process is determined through the data processing process, i.e., the process of step S102 to step S104, and the metal panel is polished at the adaptive grinding wheel speed for the next working process. In a specific implementation of an embodiment of the present invention, the total working time of each polishing site is the same, and the total working time of each polishing site is divided into a preset number of working processes, so that the speed is adaptively adjusted according to each working process to perform more accurate metal panel polishing. In a specific implementation of an embodiment of the present invention, the total working time of a single polishing site is set to 10 minutes, and the preset number is set to 10, that is, the working time of each working process of each polishing site is 1 minute; the preset number and the total working time of a single polishing site can be adjusted according to the specific implementation environment, and no further details are given here.

[0050] Step S102: In the grayscale image of the polishing surface, according to the grayscale value distribution disorder of all pixels and the height data value distribution disorder, determine the rotation speed effect excellence of each polishing position in each working process.

[0051] This application takes into account that setting an unreasonable grinding wheel speed will cause poor polishing surface treatment effect, and therefore analyzes the polishing treatment effect after a single work process is completed; considering that when the polishing effect is poor, metal panel morphology problems such as uneven polishing and surface thermal deformation will occur, so in the dimension of panel morphology, combined with the chaotic grayscale distribution in the grayscale image of the polishing surface and the chaotic distribution of height data values, the rotation speed effect is measured.

[0052] Preferably, in some possible implementations of the embodiments of the present invention, the process of obtaining the rotation speed effect excellence includes:

[0053] Calculate the mean grayscale value of all pixels in the grayscale image of the polished surface; determine the local grayscale standard deviation of each pixel based on the difference between the grayscale value of each pixel and the mean grayscale value; use the mean of the local grayscale standard deviations of all pixels in the grayscale image of the polished surface as the panel unevenness after each work process at each polishing site. The mean grayscale value represents the overall grayscale characteristics in the grayscale image of the polished surface. Therefore, the larger the local grayscale standard deviation obtained based on the mean grayscale value, the greater the deviation of the grayscale value of the corresponding pixel compared to the overall grayscale characteristics. Therefore, the larger the mean of the local standard deviation of all pixels, the more uneven the grayscale distribution in the grayscale image of the polished surface, the more uneven the corresponding metal panel is after the corresponding work process, and the worse the speed effect of the grinding wheel speed of the corresponding work process.

[0054] According to the overall fluctuation of the height data values ​​corresponding to all pixels, the panel deformation degree of each polishing site after each work process is completed is determined; preferably, in some possible implementation methods of the embodiments of the present invention, the process of obtaining the panel deformation degree includes: calculating the mean value of the height data values ​​of all pixels in the grayscale image of the polishing surface; determining the local height standard deviation of each pixel according to the difference between the height data value corresponding to each pixel and the mean value of the height data value; determining the panel deformation degree of each polishing site after each work process is completed according to the mean value of the local height standard deviation of all pixels in the grayscale image of the polishing surface. Analogous to the distribution of grayscale values, the smaller the deformation degree of the metal panel, the more consistent the corresponding height data value is usually; conversely, the more discrete or chaotic the distribution of each height data value of each polishing site after each work process is completed, the more serious the deformation of the metal panel is; therefore, the larger the overall local height standard deviation corresponding to all pixels, the greater the panel deformation degree after processing with the grinding wheel speed of the corresponding work process, and the worse the speed effect of the grinding wheel speed of the corresponding work process.

[0055] As the panel unevenness and panel deformation increase, the speed effect of the grinding wheel in the corresponding work process becomes worse. Therefore, the speed effect is comprehensively determined based on the panel unevenness and panel deformation. Further, the speed effect excellence of each polishing site after each work process is determined based on the panel unevenness and panel deformation. Both the panel unevenness and panel deformation are negatively correlated with the speed effect excellence.

[0056] Preferably, in some possible implementations of the embodiments of the present invention, the process of determining the degree of excellence of the rotation speed effect at each polishing site after each work process is completed according to the panel unevenness and panel deformation includes: normalizing the product between the panel unevenness and the panel deformation to a negative correlation, and determining the degree of excellence of the rotation speed effect at each polishing site after each work process is completed. It should be noted that, in addition to the product, the implementer may also calculate the degree of excellence of the rotation speed effect by other methods according to the correlation, such as using the normalized value of the mean and the sum value instead of the product, which will not be further elaborated here.

[0057] In a specific implementation of the embodiment of the present invention, the process of obtaining the rotation speed effect excellence is expressed in the formula as follows:

[0058] ;in, For the The polishing site is The speed effect of each working process is excellent; For the The polishing site is The number of pixels in the grayscale image of the polished surface after each work process is completed; For the The polishing site is The grayscale image of the polished surface after the first work process is completed The gray value of each pixel; For the The polishing site is The mean grayscale value of all pixels in the grayscale image of the polished surface after the work process is completed; For the The polishing site is The grayscale image of the polished surface after the first work process is completed The local grayscale standard deviation of each pixel; For the The polishing site is The unevenness of the panel after each work process is completed; For the The polishing site is The grayscale image of the polished surface after the first work process is completed The height data value of each pixel; For the The polishing site is The mean value of the height data of all pixels in the grayscale image of the polished surface after the end of each work process; For the The polishing site is The grayscale image of the polished surface after the first work process is completed The local height standard deviation of each pixel; For the The polishing site is The degree of panel deformation after a working process is completed; It is a linear normalization function. The implementer can adjust the normalization method according to the specific implementation environment.

[0059] Step S103: Determine the speed adjustment value of each polishing position in each working process based on the change of the grinding wheel speed before each working process at each polishing position and the change of the corresponding speed effect excellence.

[0060] When the grinding wheel speeds of two adjacent working processes change, the corresponding speed effect excellence will usually change; therefore, the speed adjustment effects of the grinding wheel speeds of the two working processes can be measured according to the changes in the speed effect excellence of the two working processes, thereby providing a reference for the speed adjustment process of the next working process.

[0061] Preferably, in some possible implementations of the embodiments of the present invention, the process of obtaining the speed adjustment value includes:

[0062] At each polishing site, each work process is taken as the target process in turn, the first work process before the target process is taken as the first reference process, and the second work process before the target process is taken as the second reference process; the order is the second reference process, the first reference process, and the target process.

[0063] According to the relative size of the grinding wheel speed between the first reference process and the second reference process and the relative size of the speed effect excellence, the direction adjustment value of the target process is determined. The direction adjustment value determines the adjustment direction of the grinding wheel speed of the target process relative to the grinding wheel speed of the first reference process. According to the relative change of the speed effect excellence between the second reference process and the first reference process, the credibility feedback of the change direction of the grinding wheel speed is performed, so as to indirectly judge the grinding wheel speed adjustment direction of the target process, that is, the direction adjustment value, based on the feedback credibility.

[0064] Preferably, in some possible implementations of the embodiments of the present invention, the process of acquiring the direction adjustment value includes:

[0065] The difference between the grinding wheel speed of the first reference process and the grinding wheel speed of the second reference process is used as the first reference difference; the difference between the speed effect excellence of the first reference process and the speed effect excellence of the second reference process is used as the second reference difference; the product of the first reference difference and the second reference difference is used as the direction judgment value; when the direction judgment value is greater than 0, the direction adjustment value of the target process is set to a preset first direction value; the preset first direction value is greater than 0; when the direction judgment value is less than 0, the direction adjustment value of the target process is set to a preset second direction value; the preset second direction value is less than 0; when the direction judgment value is equal to 0, the direction adjustment value of the target process is set to 0.

[0066] When the first reference difference is greater than 0, the grinding wheel speed of the first reference process increases compared with the second reference process; when the first reference difference is equal to 0, the grinding wheel speed of the first reference process remains unchanged compared with the second reference process; when the first reference difference is less than 0, the grinding wheel speed of the first reference process decreases compared with the second reference process; when the second reference difference is greater than 0, the speed effect excellence of the first reference process increases compared with the second reference process; when the second reference difference is equal to 0, the speed effect excellence of the first reference process remains unchanged compared with the second reference process; when the second reference difference is less than 0, the speed effect excellence of the first reference process decreases compared with the second reference process.

[0067] When the direction judgment value is greater than 0, there are two situations: one is that the first reference process has an increased grinding wheel speed and an increased speed effect excellence compared to the second reference process; the other is that the first reference process has a decreased grinding wheel speed and a decreased speed effect excellence compared to the second reference process; both situations can explain that increasing the grinding wheel speed can make the speed effect more excellent, so the grinding wheel speed of the target process should be greater than that of the first reference process, and the adjustment direction should be an increase in the grinding wheel speed, so the preset first direction value is greater than 0; in a specific implementation method of an embodiment of the present invention, the preset first direction value is set to 1.

[0068] When the direction judgment value is less than 0, there are two situations: one is that the first reference process has an increased grinding wheel speed but a decreased speed effect excellence compared to the second reference process; the other is that the first reference process has a decreased grinding wheel speed but an increased speed effect excellence compared to the second reference process; both situations can explain that reducing the grinding wheel speed can make the speed effect more excellent, so the grinding wheel speed of the target process should be smaller than that of the first reference process, and the adjustment direction should be to reduce the grinding wheel speed, so the preset second direction value is less than 0; in a specific implementation method of an embodiment of the present invention, the preset first direction value is set to -1.

[0069] When the direction determination value is equal to 0, the corresponding first reference process is that the grinding wheel speed remains unchanged or the speed effect excellence remains unchanged compared to the second reference process, or both the grinding wheel speed and the speed effect excellence remain unchanged. When the grinding wheel speed remains unchanged in the first reference process compared to the second reference process, the target grinding wheel speed is not adjusted because there is no reference direction for the grinding wheel speed; when the speed effect excellence remains unchanged in the first reference process compared to the second reference process, the corresponding speed effect excellence can be obtained without adjusting the target grinding wheel speed, so the target grinding wheel speed is not adjusted. It should be noted that the direction determination value equal to 0 usually corresponds to the situation where the speed effect excellence does not change after reaching the highest value, which will not be further elaborated here.

[0070] In addition, it should be noted that since there is no corresponding first reference process and second reference process for the first two working processes of each polishing position, in a specific implementation method of an embodiment of the present invention, the grinding wheel speed of the first working process of each polishing position is set to the maximum grinding wheel speed, and the grinding wheel speed of the second working process is set to three quarters of the maximum grinding wheel speed, which can be adjusted according to the specific implementation environment; and it should be noted that the grinding wheel speeds of the first working process and the second working process cannot be the same, otherwise the direction judgment value will be 0, resulting in the inability to perform adaptive grinding wheel speed adjustment.

[0071] The speed adjustment weight of the target process is determined according to the speed effect excellence deviation between the first reference process and the second reference process and the overall change of the speed effect excellence of all working processes before the target process. After determining the adjustment direction, the speed adjustment amplitude corresponding to the first reference process compared with the second reference process is further used as a reference for the speed adjustment amplitude of the target process, and if the speed change corresponding to the speed adjustment amplitude corresponding to the first reference process compared with the second reference process is different from the speed change of the historical working process, the corresponding speed adjustment amplitude can be more accurately optimized or corrected to a certain extent.

[0072] Preferably, in some possible implementations of the embodiments of the present invention, the process of acquiring the speed adjustment weight includes:

[0073] The difference between the speed effect excellence of the first reference process and the speed effect excellence of the second reference process is taken as the speed effect deviation value. The larger the speed effect deviation value, the greater the change in the speed effect after the speed adjustment of the first reference process. Therefore, regardless of the direction of speed increase or speed decrease, a larger speed adjustment value is required to obtain a better speed effect; that is, the larger the speed effect deviation value, the larger the speed adjustment range of the target process should be.

[0074] A two-dimensional coordinate system is constructed with the speed effect excellence as the ordinate and the work process index value as the abscissa; the least squares method is used to fit all the coordinate points corresponding to all the work processes before the target process in the two-dimensional coordinate system to determine the benchmark fitting line corresponding to the target process; the least squares method is used to fit all the coordinate points corresponding to all the work processes before the first reference process in the two-dimensional coordinate system to determine the reference fitting line corresponding to the target process; the difference between the slope of the benchmark fitting line and the slope of the reference fitting line is positively correlated to determine the reference trend impact value. Compared with the reference fitting line, the benchmark fitting line has one more coordinate point corresponding to the first reference process, so the difference in slope between the benchmark fitting line and the reference fitting line reflects the influence of the determination of the coordinate point corresponding to the first reference process on the overall slope; the greater the difference between the slope of the benchmark fitting line and the slope of the reference fitting line, the more the speed effect excellence of the first reference process has an increasing trend, and the greater the corresponding reference, so the magnet can increase the speed adjustment amplitude, that is, when the reference trend impact value is greater, the corresponding speed adjustment amplitude should be greater.

[0075] The speed adjustment degree is further characterized by combining the reference trend influence value and the speed effect deviation value. The speed adjustment weight of the target process is determined according to the reference trend influence value and the speed effect deviation value. Both the reference trend influence value and the speed effect deviation value are positively correlated with the speed adjustment weight. The larger the speed adjustment weight, the larger the final speed adjustment range.

[0076] Preferably, in some possible implementations of the embodiments of the present invention, the process of determining the speed adjustment weight of the target process according to the reference trend influence value and the speed effect deviation value includes: normalizing the product between the reference trend influence value and the speed effect deviation value to determine the speed adjustment weight of the target process. The value range of the speed adjustment weight is limited to 0 to 1 by normalization, which is more in line with the numerical value of the weight, so that the speed adjustment value obtained subsequently is more accurate.

[0077] In a specific implementation of the embodiment of the present invention, the process of obtaining the speed adjustment weight is expressed by the formula:

[0078] ;in, For the The polishing site corresponds to The speed adjustment weight of each working process; For the The polishing site corresponds to The speed effect excellence of the first reference process of each working process; For the The polishing site corresponds to The speed effect excellence of the second reference process of the working process; For the The polishing site corresponds to The speed effect deviation value of each working process; For the The polishing site corresponds to The slope of the baseline fitting line for each work process; For the The polishing site corresponds to The slope of the reference fitted line for each work process; is an exponential function with a natural constant as base; For the The polishing site corresponds to In other specific implementations of the embodiments of the present invention, other positive correlation mapping methods may also be used to replace ,For example , is a hyperbolic tangent function, and needs to make When it is greater than 0, the value after positive correlation mapping is greater than 1; When it is less than 0, the value after positive correlation mapping is less than 1; When it is equal to 0, the value after positive correlation mapping is equal to 1; in order to achieve the purpose of enhancing and weakening the speed adjustment amplitude according to the reference trend influence value, no further details are given here.

[0079] The direction adjustment value determines the adjustment direction of the grinding wheel speed of the target process, that is, increase, decrease or remain unchanged; the speed adjustment weight determines the speed adjustment amplitude and is also used as the weight of the a priori rated grinding wheel speed to determine the final speed adjustment amplitude. Further, the speed adjustment value of the target process is determined based on the product of the direction adjustment value, the speed adjustment weight and the a priori rated grinding wheel speed. In a specific implementation of an embodiment of the present invention, the a priori rated grinding wheel speed is set to one eighth of the maximum grinding wheel speed, which can be adjusted according to the specific implementation environment.

[0080] In a specific implementation of the embodiment of the present invention, the process of obtaining the speed adjustment value is expressed by the formula:

[0081] ;in, For the The polishing site corresponds to The speed adjustment value of each working process; is the a priori rated grinding wheel speed; For the The polishing site corresponds to The direction adjustment value of each working process; For the The polishing site corresponds to The speed adjustment weight of each worker process.

[0082] Step S104: determining the adaptive grinding wheel speed for each working process according to the speed adjustment value; and performing metal panel polishing according to the adaptive grinding wheel speed.

[0083] After obtaining the speed adjustment value, the speed is adjusted based on the grinding wheel speed of the previous working process, so as to determine the adaptive grinding wheel speed of each working process in real time, and then the grinding wheel speed of the speed effect is gradually determined according to the adaptive grinding wheel speed of each working process, so that the effect of polishing the metal panel according to the adaptive grinding wheel speed is better.

[0084] Preferably, in some possible implementations of the embodiments of the present invention, the process of acquiring the adaptive grinding wheel speed includes:

[0085] The sum of the grinding wheel speed of the previous working process of each working process and the speed adjustment value is used as the adaptive grinding wheel speed of each working process. In a specific implementation of the embodiment of the present invention, the process of obtaining the adaptive grinding wheel speed is expressed by the formula:

[0086] ;in, For the The polishing site corresponds to Adaptive grinding wheel speed for each working process; For the The polishing site corresponds to The grinding wheel speed of the previous working process of the working process; For the The polishing site corresponds to It should be noted that the adaptive grinding wheel speed of each working process is regarded as the grinding wheel speed in the subsequent real-time calculation; that is, The polishing site corresponds to In the calculation process of the adaptive grinding wheel speed of a working process, the The grinding wheel speed of each working process is the corresponding adaptive grinding wheel speed. Further, according to the adaptive grinding wheel speed of each working process corresponding to each polishing position, the metal panel is adaptively polished with better effect.

[0087] To summarize, firstly, the polishing grayscale image after each work process at each polishing position is analyzed, and the excellence of the speed effect is measured from the panel morphology dimension; then, a more accurate speed adjustment value is further determined according to the changes in the grinding wheel speed in the historical work process and the changes in the excellence of the speed effect, so that the grinding wheel speed of each polishing position is adaptively adjusted according to the speed adjustment value, which solves the problem that when a fixed-speed grinding wheel is used to polish metal panels for different purposes, the metal material of some metal panels can adapt to the optimal speed. There is a significant difference between the fixed speed of the grinding wheel, which leads to uneven polishing, surface thermal deformation and other problems on the surface of the metal plate after polishing. This makes the polishing effect of the metal panel better.

[0088] The present application also proposes a surface treatment device for a metal panel, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the device implements any one of the steps of a surface treatment process for a metal panel.

[0089] It should be noted that the sequence of the above embodiments of the present invention is only for description and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0090] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

Claims

1. A surface treatment process for a metal panel, characterized in that: The following steps are involved: During the polishing process of the metal panel, a grayscale image of the polished surface of each polishing site after each work process is completed and a height data value corresponding to each pixel point in the grayscale image of the polished surface are collected; In the polishing surface grayscale image, the rotation speed effect excellence of each polishing site in each working process is determined according to the grayscale value distribution disorder of all pixel points and the height data value distribution disorder; According to the change of the grinding wheel speed before each working process of each polishing position and the change of the corresponding speed effect excellence, the speed adjustment value of each polishing position in each working process is determined; The adaptive grinding wheel speed of each working process is determined according to the speed adjustment value; and the metal panel is polished according to the adaptive grinding wheel speed.

2. A surface treatment process for a metal panel according to claim 1, characterized in that: The process of obtaining the excellent degree of the rotation speed effect includes: Calculate the mean grayscale value of all pixels in the grayscale image of the polished surface; determine the local grayscale standard deviation of each pixel according to the difference between the grayscale value of each pixel and the mean grayscale value; take the mean of the local grayscale standard deviation of all pixels in the grayscale image of the polished surface as the panel unevenness degree after each work process at each polishing site; According to the overall fluctuation of the height data values ​​corresponding to all pixel points, the panel deformation degree after each work process at each polishing site is determined; The excellence of the rotation speed effect at each polishing position after each work process is completed is determined according to the panel unevenness and the panel deformation; the panel unevenness and the panel deformation are negatively correlated with the excellence of the rotation speed effect.

3. The surface treatment process of a metal panel according to claim 2, characterized in that: The process of obtaining the panel deformation degree includes: Calculate the mean value of the height data values ​​of all pixels in the grayscale image of the polishing surface; determine the local height standard deviation of each pixel based on the difference between the height data value corresponding to each pixel and the mean value of the height data value; determine the degree of panel deformation at each polishing site after each work process is completed based on the mean value of the local height standard deviation of all pixels in the grayscale image of the polishing surface.

4. The surface treatment process of a metal panel according to claim 2, characterized in that: The process of determining the excellence of the rotation speed effect of each polishing position after each work process is completed according to the unevenness of the panel and the deformation of the panel includes: The product of the panel unevenness and the panel deformation is normalized by negative correlation, and the rotation speed excellence of each polishing site after each work process is completed is determined.

5. The surface treatment process of a metal panel according to claim 1, characterized in that: The process of obtaining the speed adjustment value includes: At each polishing position, each working process is taken as the target process in turn, the first working process before the target process is taken as the first reference process, and the second working process before the target process is taken as the second reference process; the grinding wheel speed of the first working process of each polishing position is set to the maximum grinding wheel speed, and the grinding wheel speed of the second working process is set to three quarters of the maximum grinding wheel speed; Determine the direction adjustment value of the target process according to the relative size of the grinding wheel speed between the first reference process and the second reference process and the relative size of the speed effect excellence; Determine the speed adjustment weight of the target process according to the speed effect excellence deviation between the first reference process and the second reference process and the overall change of the speed effect excellence of all working processes before the target process; The speed adjustment value of the target process is determined according to the product of the direction adjustment value, the speed adjustment weight and the a priori rated grinding wheel speed.

6. The surface treatment process of a metal panel according to claim 5, characterized in that: The process of obtaining the direction adjustment value includes: The difference between the grinding wheel speed of the first reference process and the grinding wheel speed of the second reference process is used as the first reference difference; the difference between the speed effect excellence of the first reference process and the speed effect excellence of the second reference process is used as the second reference difference; the product of the first reference difference and the second reference difference is used as the direction determination value; When the direction determination value is greater than 0, the direction adjustment value of the target process is set to a preset first direction value; the preset first direction value is greater than 0; When the direction determination value is less than 0, the direction adjustment value of the target process is set to a preset second direction value; the preset second direction value is less than 0; When the direction determination value is equal to 0, the direction adjustment value of the target process is set to 0.

7. The surface treatment process of a metal panel according to claim 5, characterized in that: The process of obtaining the speed adjustment weight includes: The difference between the rotation speed effect excellence of the first reference process and the rotation speed effect excellence of the second reference process is used as the rotation speed effect deviation value; A two-dimensional coordinate system is constructed with the speed effect excellence as the ordinate and the work process index value as the abscissa; the least squares method is used to fit all coordinate points corresponding to all work processes before the target process in the two-dimensional coordinate system to determine the reference fitting line corresponding to the target process; the least squares method is used to fit all coordinate points corresponding to all work processes before the first reference process in the two-dimensional coordinate system to determine the reference fitting line corresponding to the target process; the difference between the slope of the reference fitting line and the slope of the reference fitting line is positively correlated to determine the reference trend impact value; The speed adjustment weight of the target process is determined according to the reference trend influence value and the speed effect deviation value; the reference trend influence value and the speed effect deviation value are both positively correlated with the speed adjustment weight.

8. The surface treatment process of a metal panel according to claim 7, characterized in that: The process of determining the speed adjustment weight of the target process according to the reference trend influence value and the speed effect deviation value includes: The product of the reference trend impact value and the speed effect deviation value is normalized to determine the speed adjustment weight of the target process.

9. The surface treatment process of a metal panel according to claim 1, characterized in that: The process of obtaining the adaptive grinding wheel speed includes: The sum of the grinding wheel rotation speed of the previous working process of each working process and the rotation speed adjustment value is used as the adaptive grinding wheel rotation speed of each working process.

10. A surface treatment device for a metal panel, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the surface treatment process of a metal panel as described in any one of claims 1 to 9 are implemented.

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