A spraying device for simulating the blow molding of an automobile inner panel

Abstract

The utility model provides a kind of simulating the spraying device of automobile inner plate coating blow flower, including two-axis coating mechanism, the two-axis coating mechanism includes the spray gun that can be lifted along vertical direction and the carrying platform that can move along first horizontal direction;And detachable fixed on the workpiece to be sprayed of the carrying platform, the geometric feature structure for simulating car body inner plate structure is formed on the workpiece to be sprayed;The geometric feature structure at least includes the bending surface of arc and the first plane and the second plane respectively with bending surface along the both ends of its own bending track smooth transition connection;The workpiece to be sprayed is configured to be driven to the position corresponding with spray gun to realize the spraying of spray gun to the geometric feature structure on the workpiece to be sprayed under the driving of carrying platform.

Description

Technical Field

[0001] This utility model relates to the technical field of paint spraying equipment. More specifically, it relates to a spraying device that simulates the brushing process of paint application on automotive interior panels. Background Technology

[0002] In modern society, automobiles, as an important means of transportation, play an indispensable role in people's daily lives and work. With the continuous improvement of living standards, consumers' demands for the overall quality of automobiles are also increasing, among which appearance quality has become one of the key factors influencing car purchase decisions. As an important component of vehicle appearance, the automotive coating's visual effect and overall texture directly affect consumers' willingness to buy.

[0003] Automotive painting is a crucial step in the vehicle manufacturing process, and the quality of the coating application directly determines the final appearance. Currently, multi-axis industrial robots are widely used for automated painting of car bodies. Their motion trajectories can precisely match the complex curvature of the car body's outer surface, resulting in a uniform and high-quality coating. However, in areas with complex structures, especially in areas that are difficult to paint, such as the interior panels, paint film defects such as uneven coloring often occur, severely affecting the overall aesthetics. These problems often stem from physical interferences such as paint mist turbulence and airflow rebound caused by the geometric structure, which are particularly noticeable at corners, edges, and gaps. In contrast, large flat areas such as the hood and doors are generally less prone to such defects due to their stable airflow field.

[0004] Currently, performance verification in automotive coating laboratories is mostly based on flat test panels, and the accompanying spraying equipment is mainly two-axis robots, which cannot effectively simulate the spraying environment under the complex three-dimensional structure of a real vehicle. Therefore, the existing laboratory evaluation system is unable to reproduce and diagnose paint film abnormalities such as scratches in complex areas of the vehicle body, thus restricting further optimization of coating processes and material quality. Utility Model Content

[0005] The purpose of this invention is to provide a spraying device that simulates the brushing process of paint on automotive interior panels, in order to solve at least one of the aforementioned technical problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This utility model provides a spraying device for simulating the brushing and stenciling of automotive interior panel coatings, comprising:

[0008] A two-axis coating mechanism, comprising a spray gun that can be raised and lowered in a vertical direction and a support platform that can move in a first horizontal direction;

[0009] The workpiece to be sprayed is detachably fixed to the support platform. The workpiece to be sprayed has geometric features formed on it to simulate the structure of the inner panel of a car body. The geometric features include at least an arc-shaped bending surface and a first plane and a second plane that are smoothly connected to the two ends of the bending surface along its own bending trajectory. The workpiece to be sprayed is configured to move under the drive of the support platform to a position corresponding to the spray gun so as to realize the spraying of the geometric features on the workpiece to be sprayed by the spray gun.

[0010] The preferred embodiment is that the workpiece to be coated is integrally formed from a substrate plate by bending; the first plane is set horizontally, and the second plane is set at an angle.

[0011] In a preferred embodiment, the geometric feature structure further includes a horizontally arranged third plane, the upper ends of which are connected to the second plane via a bent surface, and the first plane is at a lower height than the third plane, with the first, second, and third planes connected in sequence.

[0012] In a preferred embodiment, the geometric feature structure further includes an inclined fourth plane and a fifth plane, the fourth plane and the fifth plane having opposite inclination directions, and the adjacent ends of the fourth plane and the fifth plane being smoothly connected by a bent surface.

[0013] In a preferred embodiment, the geometric feature structure further includes an inclined connecting surface that is smoothly connected to the right end of the third plane via a bending surface and tilted downwards to the right, and a horizontal connecting surface that is smoothly connected to the lower end of the inclined connecting surface via a bending surface. The horizontal connecting surface is at the same horizontal height as the first plane, and the right end of the horizontal connecting surface is smoothly connected to the lower end of the fourth plane via a bending surface.

[0014] A preferred embodiment is that the bending surface is an inwardly concave bending surface or an outwardly convex bending surface.

[0015] In a preferred embodiment, the spray gun has a nozzle arranged along a second horizontal direction, and the support platform includes a support surface arranged along a vertical direction; the support surface and the nozzle are correspondingly matched; the spray gun can move in the vertical direction to adjust the relative position between the nozzle and the workpiece to be sprayed fixed on the support surface; the support platform is configured to drive the workpiece to be sprayed along a first horizontal direction through a spraying area in front of the nozzle, and the spray gun is configured to spray paint onto the surface of the workpiece to be sprayed with geometric features in the spraying area.

[0016] A preferred embodiment is that the two-axis coating mechanism includes a first linear module arranged in a vertical direction and a second linear module arranged in a first horizontal direction; the spray gun is fixed to the moving part of the first linear module, and the support platform is fixed to the moving part of the second linear module.

[0017] The preferred embodiment is that the substrate is made of metal; the support platform is provided with a magnetic suction component, and the workpiece to be coated is fixed to the support platform by the magnetic suction component.

[0018] The preferred option is that the thickness of the substrate is 0.6mm-2mm.

[0019] The beneficial effects of this utility model are as follows:

[0020] This invention provides a spraying device for simulating paint blooming on automotive interior panels, comprising a two-axis coating mechanism. The two-axis coating mechanism includes a spray gun that can be raised and lowered vertically and a support platform that can move horizontally. A workpiece to be sprayed is detachably fixed to the support platform. The workpiece has geometric features forming a structure to simulate the structure of an automotive interior panel. These geometric features include at least an arc-shaped bending surface and a first plane and a second plane that smoothly transition to the two ends of the bending surface along its bending trajectory. The workpiece is configured to move under the influence of the support platform to a position corresponding to the spray gun, thereby enabling the spray gun to spray the geometric features on the workpiece. This simple, low-cost device specifically designed for paint blooming testing effectively solves the problem in the prior art of reproducing and evaluating paint blooming on complex automotive interior panel structures in a laboratory setting. Specifically, this device enables laboratory simulation of paint film defects under complex environments. By bending the substrate into a composite geometric structure containing bending surfaces, slopes, and planes of unequal height, it can interfere with airflow and paint mist distribution during spraying, accurately simulating the coating effect at complex structures of real vehicle body panels. This allows for the reproduction of a specific paint film defect—blow-out paint—within the laboratory. The degree of blow-out paint film at bending and sloped surfaces is then observed to evaluate the workability of the applied paint. This device significantly reduces R&D and quality control costs, eliminating the need to purchase expensive high-degree-of-freedom multi-axis robots or occupy a complete vehicle production line for testing. This greatly reduces the verification costs and time cycles for paint development, process optimization, and quality inspection. The device expands the testing capabilities of laboratories, overcoming the limitations of traditional laboratories that can only perform horizontal spraying verification. It extends the laboratory's testing and evaluation capabilities to complex three-dimensional structures, enabling a forward-looking assessment of the paint's real-world performance. Furthermore, by designing different combinations of geometric features on the workpiece to be painted, this device can flexibly simulate the typical structure of various body panels, making it suitable for the study of painting problems in various vehicle models and different parts, with a wide range of applications. Attached Figure Description

[0021] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the overall structure of the spraying device of this utility model.

[0023] Figure 2 This is a schematic diagram showing the cooperation between the second linear module of this utility model, the support platform, and the workpiece to be coated.

[0024] Figure 3 This is a schematic diagram of the structure of the workpiece to be coated according to this utility model.

[0025] Reference numerals: 11. Spray gun, 12. Support platform, 13. First linear module, 14. Second linear module, 15. Extension rod, 16. Support component, 17. Nozzle, 2. Workpiece to be sprayed, 21. First plane, 22. Second plane, 23. Bending surface, 24. Third plane, 25. Fourth plane, 26. Fifth plane, 27. Inclined connecting surface, 28. Horizontal connecting surface. Detailed Implementation

[0026] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0027] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0028] Technologies and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such technologies and equipment should be considered part of the specification.

[0029] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0031] This invention provides a spraying device for simulating paint chipping on automotive interior panels. The device uses sheet metal as the substrate and, through bending processing, forms a composite geometric structure including angles, planes, slopes, and planes of varying heights. This allows a two-axis painting robot to reproduce the painting effect in complex areas of the vehicle's interior panels during the spraying process. This device can effectively simulate and reproduce paint film defects such as chipping in a paint laboratory, providing a convenient and reliable experimental method for the research and prevention of related defects. Combined with… Figures 1 to 3As shown, the spraying device for simulating automotive interior panel coating includes: a two-axis coating mechanism, which includes a spray gun 11 that can be raised and lowered vertically and a support platform 12 that can move horizontally; and a workpiece 2 to be sprayed, which is detachably fixed to the support platform 12. The workpiece 2 to be sprayed is integrally formed from a base plate by bending. Because the automotive interior panel itself is formed by stamping a single piece of steel plate in one go using a large stamping press, the integral forming of the workpiece 2 from a base plate by bending can accurately reproduce the manufacturing process of the real car body interior panel, thereby improving the accuracy of subsequent simulated coating test results and simplifying the manufacturing process of the workpiece to be sprayed, making it less expensive. Bending the base plate according to the simulated car body interior panel structure creates geometric features on the workpiece 2 to simulate the structure of the car body interior panel. In other words, the geometric feature structure is created by folding and bending the substrate plate to fabricate various shapes and structures on the originally flat substrate plate to simulate the complex structures of real automotive interior panels. This allows for active interference with the spray airflow during spray gun painting, thereby creating paint bleed defects in the laboratory. Furthermore, the geometric feature structure includes at least an arc-shaped bending surface 23 and a first plane 21 and a second plane 22 that smoothly transition to and connect with the two ends of the bending surface along its bending trajectory. It should be noted that the bending surface 23 here refers to the arc-shaped surface of the substrate plate after bending, used to smoothly connect the first plane 21 and the second plane 22. The second plane 22 forms a certain angle with the first plane 21.

[0032] Paint film blown-out defects mainly occur in areas prone to airflow turbulence, such as bent and inclined surfaces. In a specific embodiment, combined with... Figure 3 As shown, the first plane 21 is horizontally positioned, and the second plane 22 is inclined. The second plane 22 is inclined to the lower left. The workpiece 2 to be sprayed is configured to move under the drive of the support platform 12 to correspond to the position of the spray gun 11 so that the spray gun 11 can spray the geometric features on the workpiece 2. Setting the first plane 21 on the workpiece 2 can provide a reference benchmark for the normal paint film state when the bent surface 23 and the inclined second plane 22 are blown, so as to assess the severity of blown and thus evaluate the quality of paint workability. The first plane 21 is smoothly connected to the second plane 22 through the bent surface 23, and the included angle between the first plane 21 and the second plane 22 is greater than 0 degrees and less than 180 degrees. The second plane 22 can reproduce the areas with inclined features of the automotive inner panel, and the bent surface can reproduce the areas with arc-shaped features of the automotive inner panel.

[0033] Combination Figure 3As shown, the geometric feature structure also includes a horizontally arranged third plane 24, which is connected to the upper end of the second plane 22 (inclined surface) via a bending surface. From top to bottom, the first plane 21 is at a lower height than the third plane 24. From left to right, the first plane 21, the second plane 22, and the third plane 24 are connected sequentially, meaning that the projections of the three planes do not overlap from top to bottom. In other words, both the upper and lower ends of the second plane 22 (inclined surface) can be connected to a horizontally arranged plane via bending surfaces. The first plane 21 is connected to the lower end of the second plane 22, and the third plane 24 is connected to the upper end of the second plane 22, thus forming a stepped structure with two horizontally arranged planes at unequal heights. In the above embodiment, by continuously bending a complete substrate board, the surface of the substrate board can include a horizontally arranged first plane 21, an inclined second plane 22, and a horizontally arranged third plane 24 connected sequentially. After bending, the substrate board forms a geometric feature structure on the side to be sprayed near the spray gun 11.

[0034] Furthermore, the geometric feature structure also includes an inclined fourth plane 25 and a fifth plane 26, with opposite inclination directions. The adjacent ends of the fourth plane 25 and the fifth plane 26 are smoothly connected by an arc-shaped bending surface. The fourth plane 25 tilts downwards to the left, and the fifth plane 26 tilts downwards to the right. The fourth plane 25 and the fifth plane 26, together with the bending surface, form a triangular-like structure, with an arc-shaped apex. The degree of bending of the bending surface forming this arc-shaped apex can be designed according to the actual vehicle body structure to be simulated, accurately reproducing the different degrees of airflow interference caused by the different sharpness of the inner body panel structure during painting. This structure can extremely effectively simulate the V-shaped reinforcing ribs commonly found in inner body panels and the narrow space formed by the intersection of two inclined components. During the spraying test in this embodiment, when the paint mist from the spray gun is directed at the structure, its curved apex (bent surface) and two inclined sidewalls (fourth and fifth planes) will divert and interfere with the airflow, ultimately causing significant paint chipping defects in that area. This embodiment thus provides a testing method that can efficiently reproduce paint film defects caused by the complex spatial structure of the inner panel, greatly enhancing the simulation capability and testing coverage of this invention for different vehicle body inner panel structures, and ultimately achieving an evaluation of the workability of the paint. It is understood that the aforementioned geometric structures of the horizontal and inclined surfaces used to simulate the vehicle body inner panel structure can be tested separately or simultaneously on the same substrate. When overall synchronous testing is required, to ensure a smooth connection between the third plane 23 and the fourth plane 25 and to ensure that the workpiece 2 to be painted can be stably fixed on the support platform 12, the right end of the third plane 23 is smoothly connected to an inclined connecting surface 27 that slopes downwards to the right and a horizontal connecting surface 28 that is smoothly connected to the lower end of the inclined connecting surface 27 via a bent surface. This horizontal connecting surface 28 is at the same horizontal height as the first plane 21. The right end of this horizontal connecting surface 28 is smoothly connected to the lower end of the fourth plane 25 via a bent surface, thus forming the first plane 21, the second plane 22, the third plane 24, the fourth plane 25, and the fifth plane 26 on the same substrate. It is understood that the inclined connecting surface 27 and the horizontal connecting surface 28 can also simulate the structure of the vehicle's inner panel according to actual needs. Figure 3 In this configuration, the inclined connecting surface 27 and the horizontal connecting surface 28 are symmetrically arranged with respect to the first plane 21 and the second plane 22 about the third plane 24. It should be noted that the descriptions of the horizontal or inclined arrangements of the various planes included in the geometric features of the workpiece 2 to be coated are based on... Figure 3 The above-mentioned directional settings are not related to Figure 1 and Figure 2 The horizontal and vertical directions correspond to each other. The workpiece 2 to be sprayed is in... Figure 1The specific configuration of the support platform can be selected according to actual needs.

[0035] The bending surface 23 can be either a concave or convex bending surface. A concave bending surface refers to an inwardly recessed arc-shaped surface at the point of bending, while a convex bending surface refers to an outwardly protruding arc-shaped surface at the point of bending. When the substrate is bent upwards, the bending surface to be sprayed is a concave bending surface; when the substrate is bent downwards, the bending surface to be sprayed is a convex bending surface. Figure 3 As shown in the figure, the planes are connected by bent surfaces formed by bending the substrate. For the sake of simplicity in the attached diagram, ... Figure 3 Only the bent surface 23 connecting the first plane 21 and the second plane 22 is marked. More specifically, the bent surface 23 connecting the first plane 21 and the second plane 22 is a concave bent surface, the bent surface connecting the second plane 22 and the third plane 24 is a convex bent surface, the bent surface connecting the fourth plane 25 and the fifth plane 26 is a convex bent surface, the bent surface connecting the inclined connecting surface 27 and the third plane 24 is a convex bent surface, the bent surface connecting the inclined connecting surface 27 and the horizontal connecting surface 28 is a concave bent surface, and the bent surface connecting the horizontal connecting surface 28 and the fourth plane 25 is a concave bent surface.

[0036] The spray gun 11 of this invention has a nozzle 17 arranged along a second horizontal direction, and a support platform 12 including a support surface arranged vertically for fixing the workpiece 2 to be sprayed. The support surface corresponds to and cooperates with the nozzle 17; the spray gun 11 can move in the vertical direction to adjust the relative position between the nozzle 17 and the workpiece 2 fixed on the support platform. The support platform 12 can drive the workpiece 2 to be sprayed along a first horizontal direction through the spraying area in front of the nozzle 17, and the spray gun 11 is configured to spray paint onto the surface of the workpiece 2 with geometric features that has moved into the spraying area. The support platform 12 and the workpiece 2 to be sprayed on it can reciprocate linearly along the first horizontal direction at a uniform or variable speed under the drive of a two-axis coating mechanism. Through this movement, the entire surface of the workpiece 2 facing the nozzle 17, including the bends, slopes and first planes formed thereon by bending, sequentially passes through and is exposed to the spraying area directly in front of the nozzle 17 of the spray gun 11. To ensure high repeatability in the spraying process, the two-axis coating mechanism can be equipped with photoelectric sensors to detect the position of the spray gun 11 and the workpiece 2 to be sprayed in real time. This ensures the consistency of the spraying trajectory in each simulation test and ensures that all geometric feature surfaces can be uniformly sprayed with paint, thereby effectively reproducing the defects of blown paint film and evaluating the workability of the paint.

[0037] More specifically, refer to Figure 1 and Figure 2As shown, the two-axis coating mechanism includes a first linear module 13 arranged vertically and a second linear module 14 arranged horizontally. The second linear module 14 is supported and fixed by a support member 16. The spray gun 11 is fixed to the moving part of the first linear module 13 by an extension rod 15 arranged horizontally. The support platform 12 is fixed to the moving part of the second linear module 14. The first horizontal direction is the X direction, the second horizontal direction is the Y direction, and the vertical direction is the Z direction. The first horizontal direction and the second horizontal direction are perpendicular to each other, and the vertical direction is perpendicular to both the first and second horizontal directions. The spray gun 11 moves up and down through the first linear module 13 to adjust the height of the nozzle 17. The support platform 12 moves the workpiece 2 to be coated in front of the nozzle 17, so that the spray gun 11 can spray paint onto the geometric features of the workpiece 2. By using a two-axis painting mechanism to spray paint onto the workpiece 2 to be painted, the painting effect on the complex structure of the vehicle's inner panel is simulated. This allows for the reproduction of paint chipping issues in the paint laboratory, observation of the degree of paint chipping, and evaluation of the paint's workability. During painting, a primer can be sprayed first, followed by the color paint, or the color paint can be sprayed directly onto the workpiece 2. The film thickness is set to the normal film thickness or ±10%-20%. After spraying, conventional flash-drying / pre-baking is performed to evaluate the paint film's workability. Understandably, Figure 1 and Figure 2 The workpiece 2 to be coated shown is only schematically represented by a rectangular block to indicate that it is located on the support platform 12. For the specific structure of the workpiece 2 to be coated, please refer to [link / reference needed]. Figure 3 As shown.

[0038] The substrate material is a metal material, specifically cold-rolled steel sheet, tinplate, or stainless steel sheet, with a thickness of 0.6mm-2mm. A magnetic suction element is provided on the support platform 12, and the workpiece 2 to be sprayed is stably fixed to the support platform 12 by the magnetic attraction of the magnetic suction element. Alternatively, the substrate material can also be a non-metallic material; a magnetic suction element is provided on the support platform, and a metal sheet is adhered to the workpiece to be sprayed. The workpiece to be sprayed is fixed to the support platform by the magnetic attraction between the magnetic suction element and the metal sheet.

[0039] In summary, this utility model provides a spraying device for simulating paint blooming on automotive interior panels, comprising a two-axis coating mechanism. The two-axis coating mechanism includes a spray gun that can be raised and lowered vertically and a support platform that can move horizontally. It also includes a detachable workpiece fixed to the support platform. The workpiece has geometric features forming a structure to simulate the structure of an automotive interior panel. These geometric features include at least an arc-shaped bending surface and a first plane and a second plane that smoothly transition to the two ends of the bending surface along its bending trajectory. The workpiece is configured to move under the influence of the support platform to a position corresponding to the spray gun, thereby enabling the spray gun to spray the geometric features on the workpiece. This simple, low-cost device specifically designed for paint blooming testing effectively solves the problem in the prior art of reproducing and evaluating paint blooming on complex automotive interior panel structures in a laboratory setting. Specifically, this device enables laboratory simulation of paint film defects under complex environments. By bending the substrate into a composite geometric structure containing bending surfaces, slopes, and planes of unequal height, it can interfere with airflow and paint mist distribution during spraying, accurately simulating the coating effect at complex structures of real vehicle body panels. This allows for the reproduction of a specific paint film defect—blow-out paint—within the laboratory. The degree of blow-out paint film at bending and sloped surfaces is then observed to evaluate the workability of the applied paint. This device significantly reduces R&D and quality control costs, eliminating the need to purchase expensive high-degree-of-freedom multi-axis robots or occupy a complete vehicle production line for testing. This greatly reduces the verification costs and time cycles for paint development, process optimization, and quality inspection. The device expands the testing capabilities of laboratories, overcoming the limitations of traditional laboratories that can only perform horizontal spraying verification. It extends the laboratory's testing and evaluation capabilities to complex three-dimensional structures, enabling a forward-looking assessment of the paint's real-world performance. Furthermore, by designing different combinations of geometric features on the workpiece to be painted, this device can flexibly simulate the typical structure of various body panels, making it suitable for the study of painting problems in various vehicle models and different parts, with a wide range of applications.

[0040] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. A spraying device for simulating paint blowing on automotive interior panels, characterized in that, include: A two-axis coating mechanism, comprising a spray gun that can be raised and lowered in a vertical direction and a support platform that can move in a first horizontal direction; The workpiece to be sprayed is detachably fixed to the support platform. The workpiece to be sprayed has geometric features formed on it to simulate the structure of the inner panel of a car body. The geometric features include at least an arc-shaped bending surface and a first plane and a second plane that are smoothly connected to the two ends of the bending surface along its own bending trajectory. The workpiece to be sprayed is configured to move under the drive of the support platform to a position corresponding to the spray gun so as to realize the spraying of the geometric features on the workpiece to be sprayed by the spray gun.

2. The spraying device for simulating automotive interior panel coating with brushing technique according to claim 1, characterized in that, The workpiece to be coated is integrally formed from a substrate plate by bending; the first plane is horizontal and the second plane is inclined.

3. The spraying device for simulating automotive interior panel coating with brushing technique according to claim 2, characterized in that, The geometric feature structure also includes a horizontally arranged third plane, which is connected to the upper end of the second plane through a bent surface. The first plane is at a lower height than the third plane, and the first, second and third planes are connected in sequence.

4. The spraying device for simulating automotive interior panel coating with brushing technique according to claim 3, characterized in that, The geometric feature structure also includes a fourth plane and a fifth plane that are inclined in opposite directions, and the adjacent ends of the fourth plane and the fifth plane are smoothly connected by a bent surface.

5. The spraying device for simulating automotive interior panel coating with brushing technique according to claim 4, characterized in that, The geometric feature structure also includes an inclined connecting surface that is smoothly connected to the right end of the third plane via a bending surface and tilted downwards to the right, and a horizontal connecting surface that is smoothly connected to the lower end of the inclined connecting surface via a bending surface. The horizontal connecting surface is at the same horizontal height as the first plane, and the right end of the horizontal connecting surface is smoothly connected to the lower end of the fourth plane via a bending surface.

6. The spraying device for simulating automotive interior panel coating with brushing technique according to claim 5, characterized in that, The bending surface is either an inwardly concave bending surface or an outwardly convex bending surface.

7. The spraying device for simulating automotive interior panel coating with brushing technique according to claim 1, characterized in that, The spray gun has a nozzle arranged in a second horizontal direction, and the support platform includes a support surface arranged in a vertical direction; the support surface and the nozzle are correspondingly matched; the spray gun can move in the vertical direction to adjust the relative position between the nozzle and the workpiece to be sprayed fixed on the support surface; the support platform is configured to drive the workpiece to be sprayed along a first horizontal direction through the spraying area in front of the nozzle, and the spray gun is configured to spray paint onto the surface of the workpiece to be sprayed with geometric features in the spraying area.

8. The spraying device for simulating automotive interior panel coating with brushing technique according to claim 7, characterized in that, The two-axis coating mechanism includes a first linear module arranged in a vertical direction and a second linear module arranged in a first horizontal direction; the spray gun is fixed to the moving part of the first linear module, and the support platform is fixed on the moving part of the second linear module.

9. The spraying device for simulating automotive interior panel coating with brushing technique according to claim 2, characterized in that, The substrate is made of metal; a magnetic suction device is provided on the support platform, and the workpiece to be sprayed is fixed to the support platform by the magnetic suction device.

10. The spraying device for simulating automotive interior panel coating with a brushed finish according to claim 2, characterized in that, The thickness of the substrate is 0.6mm-2mm.

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