Spraying method of engine paint

Abstract

The invention provides a spraying method of engine paint. Comprising the following steps that S1, manual pre-paint spraying is conducted, specifically, air spraying is conducted on a key area of an engine by a professional; s2, robot mixed gas spraying, wherein after manual pre-spraying is conducted, an automatic spraying system is switched to conduct efficient spraying on the large-area area of the engine; and S3, manual paint make-up is conducted, specifically, after mixed gas spraying is conducted through the robot, paint make-up operation is conducted by professionals. Aiming at places such as complex appearance, corners, dead corners, processing surfaces and gaps where paint is difficult to spray, the long-pipe air spray gun is manually operated for spraying, so that the paint is sprayed in place without exposing the bottom; in order to solve the problems that an engine is low in painting rate and spraying efficiency and poor in film thickness consistency, a robot controlled by an accurate program is adopted to conduct large-area automatic spraying operation through a mixed gas spraying technology. And finally, for tiny differences which are difficult to observe by a machine, a professional adopts an HVLP low-pressure air spray gun to manually make up paint. The whole method is simple and efficient.

Description

Technical Field

[0001] The invention belongs to the technical field of paint spraying, and in particular relates to a method for spraying engine paint. Background Art

[0002] Engines are key components of power equipment such as automobiles, ships, and airplanes, and the quality of their surface coatings is directly related to product performance, aesthetics, and service life. Traditional engine spraying methods mainly rely on manual air spray guns, but this method generally has disadvantages such as low paint rate, large material waste, high cost, and difficulty in covering corners and dead corners. In addition, the coating quality is difficult to guarantee, which can easily lead to rust on the engine surface.

[0003] With the development of automation technology, mixed air spraying technology has gradually been applied to the field of engine spraying. Although it has improved the spraying efficiency to a certain extent, due to the complex structure of the engine, mixed air spraying still has problems such as easy sagging and difficulty in uniform spraying in corners and dead corners. Moreover, uneven spraying will further increase the probability of rust on the engine surface and affect product quality.

[0004] It can be seen that the existing engine spraying methods, such as traditional manual spraying using an air spray gun, have disadvantages such as low paint application rate, high cost, and leaking bottom; while mixed air spraying has disadvantages such as easy sagging, and failure to spray to the bottom in corners and dead corners. Moreover, the common problems of the two conventional spraying methods also include low rust prevention ability and easy rusting.

[0005] In summary, how to provide a new type of engine paint spraying method that can simultaneously solve many problems such as low paint rate, easy sagging, corners and dead corners that cannot be sprayed to the bottom, and easy rusting is of great significance to the field and technicians in this field. Summary of the invention

[0006] The purpose of the present invention is to provide a method for spraying engine paint. Aiming at various factors that lead to poor spraying effect of existing engine paint, corresponding devices and technologies are used for spraying respectively, so as to solve many problems such as low paint rate, easy sagging, corners and dead corners that cannot be sprayed to expose the bottom, and easy rust in one operation procedure.

[0007] Specifically, for the engine with complex shape, corners, dead angles, processed surfaces, gaps and other places where paint is difficult to spray, a manually operated long-tube air spray gun is used for spraying to ensure that the paint is sprayed in place without exposing the bottom; for the problems of low engine paint rate, low spraying efficiency and poor film thickness consistency, a robot controlled by a precise program is used to perform large-area automated spraying operations with mixed air spraying technology;

[0008] Finally, for subtle differences that are difficult to observe with machines, manual touch-up can be done by professionals. At the same time, manual touch-up uses an HVLP low-pressure air spray gun, which solves the problems of frequent paint mist scattering and rebound and low painting rate caused by ordinary air spray guns.

[0009] To achieve the above object, the present invention provides a method for spraying engine paint, which specifically comprises the following steps:

[0010] S1 Manual Pre-painting: Professionals perform air spraying on key areas of the engine;

[0011] S2 Robotic air-mixing spraying: After completing the manual pre-painting in step S1, switch to the automated spraying system to spray a large area of ​​the engine efficiently;

[0012] S3 Manual touch-up: After completing step S2 robot mixed air spraying, professional personnel will perform touch-up work to complete the engine paint spraying work.

[0013] In a preferred embodiment, in step S1, the air spraying device is a long tube spray gun.

[0014] In the present invention, the design of a long-tube spray gun allows the operator to flexibly adjust the spraying angle and distance without directly contacting the engine, ensuring that the expected key areas are fully and evenly pretreated, thereby avoiding the phenomenon of leaking the bottom and improving the painting rate.

[0015] In a preferred embodiment, in step S1, the key areas include corners, blind spots, processed surfaces, and gaps of the engine. These areas are difficult to be effectively covered by the robot, and after pre-spraying, leaks and bottom exposure can be avoided.

[0016] In a preferred embodiment, in step S2, the automated spraying system specifically includes: using a robot controlled by a program to spray a large area using a mixed air spraying technique.

[0017] In the present invention, the air-mixing spraying technology is used to effectively mix air and paint, which can achieve good coating quality and low material waste while ensuring the spraying speed. The robot's spraying path and parameter settings can be optimized through precise program control, further reducing the occurrence of sagging, ensuring uniform coating and consistent thickness, thereby avoiding rust and other problems.

[0018] In a preferred embodiment, in step S3, the device for the touch-up paint operation is a HVLP low-pressure air spray gun.

[0019] In the present invention, a professional is used to operate an HVLP low-pressure air spray gun for touch-up painting, the purpose of which is that the HVLP (High Volume Low Pressure) spray gun, with its low pressure (2-3 kg pressure and high flow) characteristics, can repair the minor flaws or missed areas that may appear after robot spraying without damaging the sprayed surface, ensuring that the coating on the entire engine surface is flawless. At the same time, the use of the HVLP spray gun can further improve the density and adhesion of the coating and enhance the rust prevention ability of the engine.

[0020] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0021] 1. Improve the painting rate and reduce costs: In the technical solution provided by the present invention, through the combination of manual pretreatment and robot mixed air spraying, it not only ensures the full coverage of corners and dead corners, but also improves the efficiency of large-area spraying. The painting rate is increased by 40% compared with the traditional air spraying method, effectively reducing material waste and costs.

[0022] 2. Avoid leaking and bottom exposure and sagging: Manual pretreatment ensures complete coverage of corners and dead corners, avoiding leaking and bottom exposure; while robot mixed gas spraying effectively reduces the occurrence of sagging by optimizing the spraying path and parameter settings.

[0023] 3. Improve coating quality and anti-rust ability: The touch-up work of the HVLP low-pressure air spray gun further improves the uniformity and glossiness of the coating, while the long-tube spray gun ensures 100% of the paint is sprayed in place, while enhancing the density and thickness of the coating. Compared with the technical solution that does not use the long-tube spray gun and the HVLP low-pressure air spray gun, the technical solution of the present invention improves the anti-rust ability of the engine by more than 70%.

[0024] 4. Improve production efficiency: The technical solution provided by the present invention combines manual and robotic operations, which not only gives full play to the flexibility of manual work in detail processing, but also utilizes the high efficiency of robots in large-area spraying, significantly improving the overall spraying efficiency. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] Unless otherwise specified, the technical means used in the present invention are conventional means well known to those skilled in the art, and the various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods. The reagents used in the present invention are analytically pure unless otherwise specified.

[0031] Example 1

[0032] A method for spraying engine paint, specifically comprising the following steps:

[0033] S1 Manual pre-painting: Professionals use a long-tube spray gun to air spray the engine's corners, dead corners, processed surfaces, and gaps;

[0034] S2 Robotic air-mixing spraying: After completing the manual pre-painting in step S1, switch to the automated spraying system, use the robot to control the program, and use the air-mixing spraying technology to efficiently spray a large area of ​​the engine;

[0035] S3 Manual touch-up: After completing step S2 robot mixed air spraying, professionals use HVLP low-pressure air spray guns to perform touch-up work to complete the engine paint spraying work.

[0036] Comparative Example

[0037] A method for spraying engine paint, specifically comprising the following steps:

[0038] S1 Manual pre-painting: Professionals use ordinary spray guns to air spray the corners, dead corners, processed surfaces, and gaps of the engine;

[0039] S2 Robotic air-mixing spraying: After completing the manual pre-painting in step S1, switch to the automated spraying system, use the robot to control the program, and use the air-mixing spraying technology to efficiently spray a large area of ​​the engine;

[0040] S3 Manual touch-up: After completing step S2 robot mixed air spraying, professionals use ordinary spray guns to perform touch-up work to complete the engine paint spraying work.

[0041] Application Examples

[0042] (I) Improvement of anti-rust ability:

[0043] 1. Test method: The sprayed engines of the embodiment and comparative example were subjected to a 24-hour continuous rain test.

[0044] The test results show that the number of rust points is reduced from 15 points (comparative example) to 3 points (example), and the number of rust points is reduced by 80%.

[0045] 2. Test method: The engine after spraying of the embodiment and the comparative example is subjected to a neutral salt spray test.

[0046] The test results show that the passing time is increased from 150 hours (comparative example) to 240 hours (example), and the salt spray test time is extended by 60%.

[0047] 3. After the spraying method of the embodiment was substituted for the conventional comparative spraying method, the failure rate of rusting caused by customers dropped by 90%.

[0048] (II) Improvement of painting rate:

[0049] In step S2 of the present invention, the robot air-mixing spraying paint rate reaches 62%, while other steps remain unchanged, and the paint rate of S2 using the traditional robot air spraying method is 40%. It can be seen that the robot air-mixing spraying method used in the present invention has increased by 55%, and the effect of saving paint is significant;

[0050] In step S3 of the present invention, the paint application rate of the HVLP low-pressure air spray gun for manual touch-up paint reaches 45%, while the other steps remain unchanged, and the paint application rate of S3 using the traditional manual air spray method is 40%. It can be seen that the manual touch-up paint HVLP low-pressure air spray gun used in the present invention has an improvement of 12.5%, and the paint saving effect is significant.

[0051] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. A method for spraying engine paint, characterized in that: The following steps are involved: S1 Manual Pre-painting: Professionals perform air spraying on key areas of the engine; S2 Robotic air-mixing spraying: After completing the manual pre-painting in step S1, switch to the automated spraying system to spray a large area of ​​the engine efficiently; S3 Manual touch-up: After completing step S2 robot mixed air spraying, professional personnel will perform touch-up work to complete the engine paint spraying work.

2. The method for spraying engine paint according to claim 1, characterized in that: In step S1, the air spraying device is a long-tube spray gun.

3. The method for spraying engine paint according to claim 1, characterized in that: In step S1, the key areas include corners, blind spots, processed surfaces, and gaps of the engine.

4. The method for spraying engine paint according to claim 1, characterized in that: In step S2, the automated spraying system specifically includes: using a robot controlled by a program to spray a large area using a mixed air spraying technique.

5. The method for spraying engine paint according to claim 1, characterized in that: In step S3, the device for the touch-up paint operation is a HVLP low-pressure air spray gun.

6. The method for spraying engine paint according to claim 1, characterized in that: The specific steps include: S1 Manual pre-painting: Professionals use a long-tube spray gun to air spray the engine's corners, dead corners, processed surfaces, and gaps; S2 Robotic air-mixing spraying: After completing the manual pre-painting in step S1, switch to the automated spraying system, use the robot to control the program, and use the air-mixing spraying technology to efficiently spray a large area of ​​the engine; S3 Manual touch-up: After completing step S2 robot mixed air spraying, professionals use HVLP low-pressure air spray guns to perform touch-up work to complete the engine paint spraying work.