Film coating equipment and flexible film coating method for surface patterning of complex curved surface part

Abstract

The invention relates to film coating equipment and a flexible film coating method for surface patterning of complex curved surface parts, and relates to the field of applying a printing technology to coating conductive materials, the film coating equipment comprises a digital projection module and a multi-degree-of-freedom mobile platform, the multi-degree-of-freedom mobile platform is provided with a base used for installing to-be-machined parts, and the digital projection module comprises a shell; an optical outlet is formed in the shell, a projection chip, an ultraviolet light source and an optical lens set are integrated in the shell, and the digital projection module is installed on the multi-freedom-degree moving platform and used for projecting obtained projection patterns to the surface of a part to be machined. The multi-degree-of-freedom mobile platform is used for carrying a digital projection module, surface functional material patterning printing is carried out on a machined part with a complex surface shape, and functional material patterning coating is carried out on the complex curved surface of the part on the basis of combining digital projection with the multi-degree-of-freedom mobile platform. And the labor hour is reduced on the basis of improving the process flexibility degree.

Description

Technical Field

[0001] The present invention relates to the field of applying conductive materials by printing technology, in which the conductive materials are applied to an insulating support in a manner to form a required conductive pattern; specifically, it particularly relates to a coating equipment and a flexible coating method for surface patterning of complex curved parts. Background Art

[0002] The reliability of equipment such as aerospace and transportation is an important indicator affecting the safety and stability of the equipment. To monitor the operating status of important components such as key structural components and power systems of the equipment, temperature, strain, vibration and other sensors are generally installed at key positions in the general design to obtain the operating status of the system in real time.

[0003] The signal monitoring system of traditional equipment mostly uses commercial sensors to collect status data, and special spaces and fixed structures for installing sensors need to be reserved during the equipment design, which in turn causes an increase in equipment weight and complexity. Due to the limitations of the installation method of traditional sensors, sensors cannot be densely arranged in a network in the equipment, and only signal monitoring of key parts can be carried out; limited by the volume of the sensors, it is difficult to install sensors between the assembly interfaces of traditional equipment parts for signal collection, and only the collected data at positions near the assembly interfaces can be used as a substitute.

[0004] In recent years, the microelectromechanical system (MEMS) processing technology that has been gradually widely used can be used to manufacture in-situ sensors on the surface of flat or single-curved parts with a certain curvature. For the manufacture of in-situ sensors on the surface of complex curved parts, there is still a lack of effective means. In addition, the existing methods mainly use fixed templates such as photolithography masks, spraying or screen printing for patterning the surface of parts: Photolithography masks mainly utilize the photosensitive adhesives contained in functional materials. After light of a certain wavelength passes through the photolithography mask and irradiates the functional materials, the photosensitive adhesives in the irradiated / non-irradiated areas of the functional materials are cured, so that the functional materials are cured onto the surface of the parts. After the parts are rinsed, the uncured part of the functional materials is removed, and the remaining part is the designed patterned functional materials; The spraying method requires sticking masking tape and other materials on the surface of the parts in advance. After spraying is completed, the masking tape and the functional materials on it are peeled off, and the remaining part without masking tape is the designed functional material pattern to achieve the patterned printing of the functional materials; Limited by the shape of the screen, screen printing can only be carried out on flat or single-curved arc surfaces with a certain diameter at present. The implementation processes of the above several methods are all restricted by templates, with low flexibility and a large amount of manual working hours consumed during the implementation process. Summary of the Invention

[0005] According to the above-mentioned technical problems, a coating equipment and a flexible coating method for surface patterning of complex curved parts are provided. As a preparation equipment for selective exposure of complex surfaces based on digital projection and in-situ sensors on complex curved parts, the present invention is applicable to the processing of sensors such as temperature and strain on the surface of complex parts and self-powered devices.

[0006] The technical means adopted by the present invention are as follows: A coating equipment for surface patterning of complex curved parts includes a digital projection module and a multi-degree-of-freedom moving platform. A base for installing the part to be processed is arranged on the multi-degree-of-freedom moving platform. The digital projection module includes a housing, an optical outlet is installed on the housing, and a projection chip, an ultraviolet light source and an optical lens group are integrated inside the housing. The digital projection module is installed on the multi-degree-of-freedom moving platform, and the digital projection module is used to project the obtained projection pattern onto the surface of the part to be processed.

[0007] Further, the multi-degree-of-freedom moving platform includes a multi-axis machine tool with at least 5 degrees of freedom and a robotic arm.

[0008] Further, the projection chip is at least one of a DMD chip, a projection LCD chip, and an LCOS chip; the ultraviolet light source includes an ultraviolet LED light source and an ultraviolet-band laser light source, and the optical lens group is an optical magnification system with adjustable magnification; the outlet of the optical lens group is connected to the optical outlet, and their optical axes and angles are aligned; the focal length of the pattern projected in the digital projection module is infinite after passing through the magnification optical path.

[0009] Further, both the digital projection module and the multi-degree-of-freedom moving platform are connected to a control unit. The control unit is used to obtain the three-dimensional model of the processed part, identify and divide the coating pattern on the part surface according to the three-dimensional model, calculate the relative angles, coordinates and corresponding two-dimensional projection patterns that the digital projection module needs to move for each divided area according to the divided area and the optical characteristics of the digital projection module; the control unit sends control signals to the multi-degree-of-freedom moving platform to complete the real-time pose adjustment of the digital projection module.

[0010] The present invention also discloses a flexible coating method for surface patterning of complex curved surface parts. Based on the coating equipment for surface patterning of complex curved surface parts, patterning exposure and development of functional materials are carried out on the surface of the processed parts to form a patterned functional material coating; the exposure and development are based on the coordinated control of a multi-degree-of-freedom moving platform and a digital projection module. After the multi-degree-of-freedom moving platform controls the digital projection module mounted thereon to move to the relative position of the processed parts, the digital projection module projects and exposes the corresponding pattern, and the exposure time is determined by the type and properties of the photosensitive covering material used; the control system controls the digital projection module to perform regional projection based on the obtained pattern, and performs multi-layer and / or laminated coating of different patterns to form the manufacturing of functional devices on the surface of complex curved surface parts.

[0011] The present invention also discloses the specific steps of a flexible coating method for surface patterning of complex curved surface parts, including: S1. After cleaning the parts to be processed, keep them dry. S2. Spray the functional material and perform corresponding curing operations. Fix the processed parts on the multi-degree-of-freedom moving platform, and perform a coordinate zeroing operation to restore each mechanism of the multi-degree-of-freedom moving platform to the origin position. S3. The control system obtains the model of the processed parts, obtains the graphics to be exposed and aligns them on the model of the processed parts, divides the patterns, and sends control signals to the multi-degree-of-freedom moving platform. S4. During the exposure process controlled by the control system, the real-time pose adjustment of the multi-degree-of-freedom moving platform is carried out; the control system controls the digital projection module to project the corresponding divided patterns onto the surface of the processed parts. After exposing the patterns for a certain time, move the position of the digital projection module again, and repeat the above operations until all the patterns in the set area are exposed. S5. Take out the processed parts after exposure, put them into a container filled with developer for soaking and developing, and after completion, take them out, wash them, and dry them.

[0012] Further, the functional material includes photoresist. When it is photoresist, the following steps are also included after S5: S6. Replace the digital projection module installed at the end of the multi-degree-of-freedom moving platform with a spraying module for spraying the functional material or directly spray it manually. After spraying, perform a drying operation. S7. Put the processed parts into a container filled with stripping solution to remove the photosensitive glue and the functional material pasted thereon, and the remaining part is the pattern reserved for the current design. After completion, perform cleaning and drying.

[0013] Further, in step S3, after the control system obtains the model of the processed parts, the surface to be processed of the model is processed into a point cloud, the point cloud is divided into blocks, and then the conversion of the projection coordinate matrix is carried out to generate a two-dimensional projection pattern of the three-dimensional pattern.

[0014] Compared with the prior art, the present invention has the following advantages: The present invention uses a multi-degree-of-freedom mobile platform to carry a digital projection module, and performs surface functional material patterning printing on machining parts with complex surface shapes. The present invention uses digital projection combined with a multi-degree-of-freedom mobile platform as the basis to perform functional material patterning coating on the complex curved surface of parts, reducing manual working hours on the basis of improving the process flexibility, and providing a new method for the preparation of in-situ sensors on the complex curved surface of parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor.

[0016] Figure 1 Schematic diagram of the coating process for the photosensitive adhesive mixed in the functional material; Figure 2 Schematic diagram of the projection exposure process where the photosensitive adhesive and the functional material are separated; Figure 3 Overall schematic diagram of the surface patterning exposure equipment for complex curved surface parts; Figure 4 Schematic diagram of the structure of the multi-degree-of-freedom mobile platform; Figure 5 Two-dimensional pattern processing program logic; Figure 6 Schematic diagram of the structure where the digital projection module uses an LCD;

[0017] Figure 7 Schematic diagram of the structure where the digital projection module uses a high-resolution DMD chip or a reflective LCOS reflective chip;

[0018] In the figure: 010, multi-degree-of-freedom mobile platform; 020, digital projection module; 030, machining part; 011, mounting seat; 012, Y module; 013, Z module; 014, rotation device around the axis; 015, part mounting platform; 021, housing; 022, ultraviolet light source; 023a, LCD screen; 023b, high-resolution DMD chip or reflective LCOS reflective chip; 024, optical lens group. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0020] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are only a part rather than all of the embodiments of the present invention. The following description of at least one exemplary embodiment is actually illustrative only and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] It should be noted that the terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the exemplary embodiments of the present invention. As used herein, unless the context clearly dictates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of the stated features, steps, operations, devices, components, and / or combinations thereof.

[0022] Unless otherwise specifically stated, the relative arrangements of the components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for the sake of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods and devices should be regarded as part of the specification. In all the examples shown and discussed herein, any specific values should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0023] In the description of the present invention, it should be understood that the orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. generally refer to the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present invention. The orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0024] For ease of description, spatial relative terms, such as "above", "over", "on the upper surface", "upper", etc., may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, the device described as "above" or "over" other devices or structures will then be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations are made for the spatial relative descriptions used herein.

[0025] In addition, it should be noted that the use of terms such as "first" and "second" to define components is only for the convenience of differentiating the corresponding components. Without further statement, the above terms have no special meaning, and thus should not be construed as limiting the protection scope of the present invention.

[0026] As Figure 3 , Figure 4 shown, an embodiment of the present invention discloses a coating equipment for surface patterning of complex curved parts, including a digital projection module 020 and a multi-degree-of-freedom moving platform 010. A base for mounting a part to be processed 030 is provided on the multi-degree-of-freedom moving platform. The digital projection module includes a housing 021, an optical outlet is mounted on the housing, and a projection chip, an ultraviolet light source 022 and an optical lens group 024 are integrated inside the housing. The digital projection module is mounted on the multi-degree-of-freedom moving platform, and the digital projection module is used to project the acquired projection pattern onto the surface of the part to be processed.

[0027] Further, the multi-degree-of-freedom moving platform includes a multi-axis machine tool and a robotic arm with at least 5 degrees of freedom, thereby driving the digital projection module to rotate and adjust its position relative to the processed part.

[0028] The multi-degree-of-freedom moving platform 010 can drive the digital projection module 020 to translate and rotate relative to the part mounting platform 015, so as to achieve full-angle coverage centered on the processed part 030.

[0029] In this embodiment, taking a machine tool as an example, it includes a spatial position adjustment device of a digital projection module 020 arranged at one end of a multi-degree-of-freedom moving platform, which includes an X module, a Y module 012, and a Z module 013. The X module includes an x-axis guide rail, the Y module is arranged on the x-axis guide rail, the x-axis guide rail is installed on a mounting base 011, the mounting base has a preset height, the Y module includes a y-axis guide rail, and the Z module is arranged on the y-axis guide rail; the Z module includes a Z-axis guide rail, and the housing of the digital projection module 020 is connected to the Z-axis guide rail. In order to complete the adjustment of any angle between the machined part and the digital projection module, it further includes a machined part rotation device arranged at the other end of the multi-degree-of-freedom moving platform. The machined part rotation device includes a self-rotation device and a rotation-around-axis device 014. The self-rotation device is installed on a base, the part to be machined is installed on the base, and the base is connected to a first rotation motor through a rotating shaft below it; there is a rotation-around-axis device arranged oppositely at the bottom of the base. One end of the rotating shaft of the rotation-around-axis device is connected to the mounting base below the x-axis guide rail, and the other end is connected to a bracket. The motor of the rotation-around-axis device is arranged inside the mounting base.

[0030] The multi-degree-of-freedom moving platform 010 is internally provided with a plurality of high-precision deceleration servo motors and corresponding drive circuits, and the movement of each moving mechanism of the multi-degree-of-freedom moving platform is calculated and driven by a special control program to realize the full-angle relative movement of the digital projection module 020 relative to the machined part 030.

[0031] The control program divides the area of the pattern covering the part surface, automatically generates information such as the angle and coordinates of the digital projection module 020, calculates the two-dimensional projection pattern of the three-dimensional pattern at the corresponding position, and inputs it into the digital projection module 020 for projection display. Until all the areas that need to be exposed on the whole part are pattern-exposed, the machined part 030 is taken off for the developing process.

[0032] Further, the projection chip includes a DMD (Digital Micromirror Device) chip, a projection LCD chip, and an LCOS (Liquid Crystal on Silicon) chip; the ultraviolet light source includes an ultraviolet LED light source and an ultraviolet-band laser light source. As Figure 6 、 Figure 7 shown, the optical lens group is an optical magnification system with adjustable magnification; the outlet of the optical lens group is connected to the optical outlet, and their optical axes and angles are aligned; the pattern projected in the digital projection module has an infinite focal length after passing through the magnifying optical path, that is, no focusing is required, and a cleaning image can be formed at any position on the curved part. Among them, Figure 6For the LCD projection technology, at this time: The light irradiates the LCD screen 023a. The LCD screen 023a is controlled by the driving circuit to display a specific pattern. The light can only pass through the transparent area of the pattern on the LCD screen 023a. Then the light enters the optical lens group 024 for refraction and is emitted from the entire digital projection module 020 at a certain magnified angle and intensity, realizing patterned projection. Similarly, Figure 7 For the projection technology of the high-resolution DMD chip or the reflective LCOS reflective chip 023b, through the reflection principle, the light then enters the optical lens group 024 for refraction and is emitted from the entire digital projection module 020 at a certain magnified angle and intensity, realizing patterned projection.

[0033] Furthermore, both the digital projection module and the multi-degree-of-freedom mobile platform are connected to the control unit. The control unit is used to obtain the three-dimensional model of the machined part, identify and divide the coating patterns on the part surface according to the three-dimensional model, and calculate the relative angles, coordinates, and corresponding two-dimensional projection patterns required for the digital projection module to move for each divided area according to the divided area and the optical characteristics of the digital projection module. The control unit sends control signals to the multi-degree-of-freedom mobile platform to complete the real-time pose adjustment of the digital projection module.

[0034] The present invention also discloses a flexible coating method for patterning the surface of complex curved parts. Based on the coating equipment for patterning the surface of complex curved parts, patterned exposure and development of the functional material are carried out on the surface of the machined part to form a patterned functional material coating. The exposure and development are based on the coordinated control of the multi-degree-of-freedom mobile platform and the digital projection module. After the digital projection module installed at the end of the multi-degree-of-freedom mobile platform moves to the relative position of the machined part, the digital projection module projects and exposes the corresponding pattern. The exposure time is determined by the type and properties of the photosensitive masking material used and can be changed in the program. The control system controls the digital projection module to perform regional projection based on the obtained pattern, and performs multi-layer and / or laminated coating of different patterns to form the manufacturing of functional devices on the surface of complex curved parts.

[0035] In this embodiment, the selectable functional materials can be adjusted according to specific application scenarios, such as piezoelectric materials mainly composed of barium titanate, barium zirconate, zinc oxide, and bismuth ferrite powders; protective adhesives mixed with epoxy resin; electromagnetic wave absorbing materials mainly composed of carbonyl iron and silicon carbide, etc.

[0036] Specifically, the exposure process requires the coordinated control of the multi-degree-of-freedom mobile platform and the digital projection module. After the digital projection module installed at the end of the multi-degree-of-freedom mobile platform moves to the relative position of the machined part, the projection module projects and exposes the pattern corresponding to this position. The exposure time is determined by the type and properties of the photosensitive masking material used and can be changed in the program.

[0037] Specifically, the control system acquires the three-dimensional model of the machined part 030, identifies and divides the coating patterns on the part surface according to the three-dimensional model, and calculates the relative angles, coordinates, and corresponding two-dimensional projection patterns required for the movement of each divided area corresponding to the digital projection module 020 according to the divided areas and the optical characteristics of the projection module; the control program further converts the angle and coordinate information of the target movement of the digital projection module 020 corresponding to the divided areas into the motion data of each moving mechanism in the multi-degree-of-freedom moving platform 010 and the input signals of the drive circuit, and sends the signals to the multi-degree-of-freedom moving platform 010 for pose adjustment; the control program sends the projection two-dimensional pattern data and exposure time information of the digital projection module 020 corresponding to the divided areas to the decoding and drive circuit built in the digital projection module 020 for pattern exposure within the divided areas.

[0038] The present invention also discloses the specific steps of a flexible coating method for patterning the surface of complex curved parts. Specifically, It is distinguished according to whether photosensitive glue is mixed in the functional material used. Among them, As Figure 1 shown, when mixing photosensitive glue functional material, the coating process is as follows: S1. After cleaning the surface of the machined part with a weak alkaline solution and deionized water, dry the machined part with high-pressure cleaning gas or bake the machined part. S2. Spray the functional material and perform corresponding curing operations. Install and fix the machined part on the multi-degree-of-freedom moving platform and perform coordinate zeroing operations. S3. Import the machined part model into the program for controlling the multi-degree-of-freedom moving platform, draw / identify the exposure pattern and align it on the machined part model. The program automatically divides the pattern and outputs it to the digital projection module, and the program automatically sets and outputs the working code to the multi-degree-of-freedom moving platform. S4. After the control starts the exposure, the multi-degree-of-freedom moving platform controls the digital projection module to move to the position set by the program. The digital projection module projects the corresponding divided pattern onto the surface of the machined part. After exposing the pattern for a certain time, move the position of the digital projection module again and repeat the above operations until all the patterns in the set area are exposed. S5. Take out the machined part after the exposure is completed, put it into a container filled with developer for immersion development, take it out and wash and dry the machined part after completion, and then the machined part with a patterned functional material prepared on the surface can be obtained.

[0039] Replacing the functional material in the above process with a photosensitive covering material can also achieve surface patterning insulation of the part. The above operations can be repeated multiple times to prepare a functional material structure with a multi-layer structure.

[0040] As Figure 2As shown in the figure, the process flow of the functional material without mixing photosensitive glue is as follows, including: S1. After cleaning the parts to be processed, keep them dry; S2. Spray the functional material and perform corresponding curing operations. Install and fix the processed parts on the multi-degree-of-freedom moving platform, and perform coordinate zeroing operations to restore each mechanism of the multi-degree-of-freedom moving platform to the origin position; S3. The control system obtains the model of the processed parts, obtains the pattern to be exposed and aligns it on the model of the processed parts, divides the pattern, and sends the control signal to the multi-degree-of-freedom moving platform; S4. During the exposure process controlled by the control system, the real-time pose of the multi-degree-of-freedom moving platform is adjusted; the control system controls the digital projection module to project the corresponding divided pattern onto the surface of the processed parts. After exposing the pattern for a certain time, move the position of the digital projection module again, and repeat the above operations until all patterns in the set area are exposed; S5. Take out the processed parts after exposure, put them into a container filled with developer for soaking and developing, and then take them out, wash them, and dry the processed parts.

[0041] The process flow of the functional material without mixing photosensitive glue is as follows: S1. After cleaning the surface of the processed parts with a weak alkaline solution and deionized water, use high-pressure cleaning gas to dry the processed parts or dry the processed parts by baking; S2. Spray photosensitive glue / photoresist and perform corresponding curing operations. Install and fix the processed parts on the multi-degree-of-freedom moving platform, and perform coordinate zeroing operations; S3. Import the model of the processed parts into the program for controlling the multi-degree-of-freedom moving platform, draw / recognize the exposure pattern and align it on the model of the processed parts. The program automatically divides the pattern and outputs it to the digital projection module, and the program automatically sets and outputs the working code to the multi-degree-of-freedom moving platform; S4. After the exposure control starts, the multi-degree-of-freedom moving platform controls the digital projection module to move to the position set by the program. The digital projection module projects the corresponding divided pattern onto the surface of the processed parts. After exposing the pattern for a certain time, move the position of the digital projection module again, and repeat the above operations until all patterns in the set area are exposed; S5. Take out the processed parts after exposure, put them into a container filled with developer for soaking and developing, and then take them out, wash them, and dry the processed parts; S6. Replace the digital projection module installed at the end of the multi-degree-of-freedom moving platform with a spraying module for spraying the functional material or directly spray it manually. After spraying, perform a drying operation; S7. Finally, place the processed part into a container filled with a debonding solution to remove the photosensitive adhesive and the functional materials pasted thereon. The remaining part is the pattern retained in the current design. After completion, perform cleaning and drying to obtain the processed part with a patterned functional material prepared on its surface.

[0042] For the above manual spraying, the optional materials include: platinum metal powder or wire that constitutes a thermistor; thermocouple material powder or wire composed of materials such as copper and constantan (copper-nickel alloy).

[0043] The above operations can be repeated multiple times to prepare a functional material structure with a multi-layer structure.

[0044] The digital projection module is a commonly used ultraviolet band light source for photosensitive masking materials, and its projection has sufficient resolution and brightness to expose the photosensitive masking materials in a short time. The pattern projected by the digital projection module is transformed. The control program identifies and converts the projection pattern in a specific direction in the three-dimensional model, and then projects and displays it again by the digital projection module to accurately restore the three-dimensional design pattern on the surface of the processed part.

[0045] As Figure 5 shown, in step S3, after the control system obtains the processed part model, it processes the surface to be processed of the model into a point cloud, divides the point cloud into blocks, and then performs the conversion of the projection coordinate matrix to generate a two-dimensional projection pattern of the three-dimensional pattern.

[0046] The specific steps of the above process are as follows: 1) Process the surface to be machined of the imported 3D model into point cloud using a specially developed format conversion software with secondary development to obtain a point cloud file. Generally, the model point cloud file can be understood as a three-column matrix M1, where each row of the matrix represents the three-dimensional coordinates of a point; 2) Calculate the plane fitting of the overall 3D point cloud. Use the Random Sample Consensus algorithm (RANSAC) to perform fitting iteration on the aforementioned model point cloud to obtain the best estimated plane S0. The sum of the projection distances of this 3D space plane to all point clouds is the smallest, that is, this plane is the closest to the model in 3D space. Record the spatial information of the best estimated plane S0; 3) Segment the point cloud. Perform coordinate transformation on the point cloud data M1 to obtain the projection coordinate matrix M2 of all point clouds on the best estimated plane; 4) The software performs two-dimensional preliminary segmentation of all point cloud data according to the rectangle with a fixed size S1 and the point cloud coordinates M2 on the best estimated plane, and iteratively calculates the two-dimensional coordinate matrix S2’ of the center points of all divided regions S2 according to the minimization of the overlapping region, where the size of S1 is related to the optimal projection interval of the digital projection module (that is, the projection light intensity, angle, and resolution are input in advance in the program, and the optimal projection interval is calculated based on this and the size S1 is obtained); 5) For each divided region S2 and the corresponding point cloud data M2’ within the range, use the RANSAC algorithm to calculate the best fitting plane of the point cloud M2’ within this range, and calculate its center coordinate S3 and normal vector V3 based on the spatial information of this best fitting plane. Repeat this process to obtain the center coordinates S3 and normal vectors V3 of the best fitting planes within all divided regions S2’; 6) Calculate the working angle V3 and coordinate S4 of the digital projection module based on the aforementioned center coordinates S3, normal vectors V3, fixed size S1 of the best fitting plane and the relative distance required for the projection pattern of the corresponding divided region (optimal projection interval); 7) Generate a two-dimensional projection pattern of the 3D pattern in the 3D model according to the working angle (V3), coordinate S4, and fixed size S1.

[0047] In summary, the present invention is particularly applicable to: patterning and printing of surface functional materials on the surfaces of complex surface machining parts for manufacturing functional in-situ sensors or local modification; repeated patterning and printing can be performed to achieve the purpose of three-dimensional construction of functional materials; and; selective protection of complex surface machining parts, for patterned local protection against chemical milling or electrochemical corrosion and other treatment methods.

[0048] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacement on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A coating equipment for patterning the surface of complex curved parts, characterized in that: It comprises a digital projection module and a multi-degree-of-freedom mobile platform, wherein a base for mounting a part to be processed is arranged on the multi-degree-of-freedom mobile platform, wherein the digital projection module comprises a shell, wherein an optical outlet is installed on the shell, wherein a projection chip, an ultraviolet light source and an optical lens group are integrated inside the shell, wherein the digital projection module is installed on the multi-degree-of-freedom mobile platform, and wherein the digital projection module is used to project an acquired projection pattern onto a surface of the part to be processed; The digital projection module and the multi-degree-of-freedom mobile platform are both connected to a control unit, which is used to obtain a three-dimensional model of a processed part, identify the coating pattern on the part surface and divide the area according to the three-dimensional model, and calculate the relative angle, coordinates and corresponding two-dimensional projection pattern required for the digital projection module to move in each divided area according to the optical characteristics of the divided area and the digital projection module; the control unit sends a control signal to the multi-degree-of-freedom mobile platform to complete the real-time posture adjustment of the digital projection module.

2. The coating equipment for patterning the surface of complex curved parts according to claim 1, characterized in that: The multi-degree-of-freedom mobile platform includes a multi-axis machining machine tool and a robotic arm with at least 5 degrees of freedom.

3. The coating equipment for patterning the surface of complex curved parts according to claim 1, characterized in that: The projection chip is at least one of a DMD chip, a projection LCD chip, and an LCOS chip; the ultraviolet light source includes an ultraviolet LED light source and an ultraviolet band laser light source; the optical lens group is an optical magnification system with adjustable magnification; the outlet of the optical lens group is connected to the optical outlet, and the optical axes and angles of the two are aligned; The pattern projected from the digital projection module has an infinite focal length after passing through the magnified optical path.

4. A flexible coating method for coating equipment for patterning the surface of complex curved parts based on any one of claims 1 to 3, characterized in that: Patterned exposure and development of functional materials are performed on the surface of the processed parts to form a patterned functional material coating; the exposure and development is based on the coordinated control of the multi-degree-of-freedom mobile platform and the digital projection module. After the multi-degree-of-freedom mobile platform controls the digital projection module installed thereon to move to the relative position of the processed parts, the digital projection module projects and exposes the corresponding pattern, and the exposure time is determined by the type and properties of the photosensitive covering material used; the control system controls the digital projection module to perform regional projection based on the acquired pattern, and performs multi-layer and / or stacked coatings with different patterns to form functional device manufacturing on the surface of complex curved parts.

5. A flexible coating method for patterning the surface of complex curved parts, characterized in that: The steps include: S1. Clean the parts to be processed and keep them dry; S2. Spray the functional material and perform corresponding curing operations, install and fix the processed parts on the multi-degree-of-freedom mobile platform, and perform coordinate zeroing operations to restore the various mechanisms of the multi-degree-of-freedom mobile platform to the original position; S3, the control system obtains the processing part model, obtains the pattern to be exposed and aligns it on the processing part model, divides the pattern, and sends the control signal to the multi-degree-of-freedom mobile platform; S4, the control system controls the real-time posture adjustment of the multi-degree-of-freedom mobile platform during the exposure process; the control system controls the digital projection module to project the corresponding segmented pattern onto the surface of the processed part, and after exposing the pattern for a certain period of time, the position of the digital projection module is moved again, and the above operation is repeated until all patterns in the set area are exposed; S5. Take out the processed parts after exposure, put them into a container filled with developer for immersion and development, and take out, wash and dry the processed parts after completion.

6. The flexible coating method according to claim 5, characterized in that: The functional material includes photoresist. When the functional material is photoresist, the following steps are further included after S5: S6. Replace the digital projection module installed at the end of the multi-degree-of-freedom mobile platform with a spraying module to spray the functional material or directly spray it manually, and perform a drying operation after spraying is completed; S7. Place the processed parts into a container filled with a degumming liquid to remove the photosensitive adhesive and the functional materials pasted thereon. The remaining part is the pattern retained in the current design. After completion, clean and dry.

7. The flexible coating method according to claim 5 or 6, characterized in that: In step S3, after the control system obtains the processing part model, it processes the model's surface to be processed into a point cloud, divides the point cloud into blocks, and then converts the projection coordinate matrix to generate a two-dimensional projection pattern of the three-dimensional pattern.

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