Method and system for coating automobile body

Abstract

The invention provides an automobile body coating method and system. The method comprises the following steps: pre-spraying an automobile body to form a pre-sprayed coating on the automobile body; colored paint spraying is conducted on the pre-sprayed automobile body, so that a colored paint coating is formed on the automobile body, and the pre-sprayed coating is covered with the colored paint coating; varnish spraying is conducted on the automobile body obtained after colored paint spraying, so that a varnish coating is formed on the automobile body, and the colored paint coating is covered with the varnish coating; whether the automobile body sprayed with the varnish has coating defects or not is determined; and in response to the existence of the coating defects, spraying is conducted on the automobile body with the coating defects again, and when spraying is conducted on the automobile body again, pre-spraying is not conducted, colored paint spraying is conducted, and varnish spraying is conducted. According to the automobile body coating method and system, the automobile body coating quality and product performance can be ensured, meanwhile, paint material consumption is reduced, environmental pollution is reduced, and the method and system have the dual significance of energy conservation and consumption reduction.

Description

Technical Field

[0001] The present application relates to the field of automobile technology, and in particular to a method and system for painting an automobile body. Background Art

[0002] At present, the mainstream process used in some automobile body painting production lines is the 2010V process. In the 2010V process, when spraying the topcoat, pre-spraying is first performed, then the color paint is sprayed, and finally the clear coat is sprayed, eventually forming a pre-spray coating + color paint coating + clear coat.

[0003] In the actual production process, about 2% of defective products need to be returned to the topcoat for re-spraying, which is called a re-spraying vehicle. The re-spraying vehicle needs to go through the pre-spraying, color paint spraying and varnish spraying again to eliminate the coating defects. However, during the re-spraying, this completely repeated spraying method causes more material waste and environmental pollution. Summary of the invention

[0004] To at least partially solve the above-mentioned problems, according to the first aspect of the present application, an embodiment of the present application provides a method for painting an automobile body, the method comprising: pre-spraying the automobile body to form a pre-sprayed coating on the automobile body; spraying color paint on the automobile body after pre-spraying to form a color paint coating on the automobile body, the color paint coating covering the pre-sprayed coating; spraying clear varnish on the automobile body after color paint spraying to form a clear varnish coating on the automobile body, the clear varnish coating covering the color paint coating; determining whether there is a painting defect on the automobile body after clear varnish spraying; in response to the existence of a painting defect, re-spraying the automobile body with the painting defect, wherein, when re-spraying the automobile body, pre-spraying is not performed, and color paint spraying and clear varnish spraying are performed.

[0005] In some embodiments, the method is at least partially performed on a topcoat line, which includes a pre-spraying station, a color paint spraying station, and a clearcoat spraying station; when painting a car body, the car body passes through the pre-spraying station, the color paint spraying station, and the clearcoat spraying station in sequence to complete pre-spraying, color paint spraying, and clearcoat spraying, respectively; when re-spraying the car body, the car body is controlled to pass through the pre-spraying station, the color paint spraying station, and the clearcoat spraying station again, wherein when the car body passes through the pre-spraying station again, the pre-spraying station is controlled not to pre-spray the car body, and when the car body passes through the color paint spraying station and the clearcoat spraying station again, the color paint spraying station is controlled to spray color paint on the car body, and the clearcoat spraying station is controlled to spray clearcoat on the car body.

[0006] In some embodiments, in response to the existence of a painting defect, the automobile body with the painting defect is repainted, including: in response to the existence of the painting defect, the automobile body with the painting defect is marked; and the pre-spraying station is controlled not to pre-spray the marked automobile body.

[0007] In some embodiments, marking a car body with paint defects includes: rewriting the car model code of the car body with paint defects.

[0008] In some embodiments, a car body with coating defects is sent out from a trimming line and arrives at a topcoat line via a rework line; the vehicle model code is rewritten at a read / write station on the rework line.

[0009] In some embodiments, in response to the presence of a painting defect, repainting the automobile body having the painting defect also includes: determining the coating layer where the painting defect is located; and polishing the location of the painting defect on the automobile body.

[0010] In some embodiments, in response to the painting defect being located in the clearcoat layer, the clearcoat layer is polished.

[0011] In some embodiments, in response to the coating defect being located in the color paint coating, the clear coat and the color paint coating are polished.

[0012] According to the second aspect of the present application, an embodiment of the present application further provides a system for painting an automobile body, the system being used to execute the method provided in any embodiment of the first aspect of the present application.

[0013] The method and system for automobile body painting provided in the embodiments of the present application omit the pre-spraying step when re-spraying an automobile body with painting defects, and directly perform color paint spraying and clear varnish spraying. This can reduce paint material consumption and environmental pollution while ensuring the quality of automobile body painting and product performance, thus having the dual significance of energy saving and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 It is a schematic flow chart of a method for painting a car body provided in an embodiment of the present application. DETAILED DESCRIPTION

[0016] The technical scheme of the preferred embodiment of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection claimed in the present application.

[0017] The words "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0018] Combination Figure 1 According to the first aspect of the present application, an embodiment of the present application provides a method for painting an automobile body, the method comprising: pre-spraying the automobile body to form a pre-sprayed coating on the automobile body; spraying color paint on the automobile body after pre-spraying to form a color paint coating on the automobile body, the color paint coating covering the pre-sprayed coating; spraying clear varnish on the automobile body after color paint spraying to form a clear varnish coating on the automobile body, the clear varnish coating covering the color paint coating; determining whether there is a painting defect on the automobile body after clear varnish spraying; in response to the existence of a painting defect, re-spraying the automobile body with the painting defect, wherein, when re-spraying the automobile body, pre-spraying is not performed, and color paint spraying and clear varnish spraying are performed.

[0019] When painting a car body, it is usually necessary to first perform a pre-treatment step on the car body, and then perform electrophoresis on the car body, so as to facilitate the subsequent topcoat step. After the pre-treatment and electrophoresis, the car body can achieve the effect of anti-corrosion and increasing the adhesion of the coating. After the electrophoresis of the car body, the car body enters the topcoat step, which usually includes mid-coating, color paint spraying, and varnish spraying. However, the method provided in this application is mainly improved for the 2010V process. Unlike the traditional process, in the 2010V process, the topcoat step can include pre-spraying, color paint spraying, and varnish spraying. In the 2010V process, each coating has the function of protecting the electrophoretic paint and a certain UV protection. In particular, the main function of the pre-spraying coating is to block ultraviolet rays and resist stone impact; the function of the color paint coating is mainly to give color to achieve special color effects and decorative effects; the function of the varnish coating is to improve glossiness and weather resistance, and to resist chemicals, aging, and scratches. The inventors of the present application have discovered that the pre-spray coating applied during the initial spraying of the car body already has the function of shielding ultraviolet rays. During the re-spraying process of a car body with painting defects, pre-spraying is no longer necessary without affecting product quality, so the pre-spraying step can be omitted.

[0020] The method for automobile body painting provided in the embodiments of the present application omits the pre-spraying step when re-spraying an automobile body with painting defects, and directly performs color paint spraying and clear varnish spraying. This can reduce paint material consumption and environmental pollution while ensuring the quality of vehicle body painting and product performance, thus having the dual significance of energy saving and consumption reduction.

[0021] In some embodiments, the method is at least partially performed on a topcoat line, which includes a pre-spraying station, a color paint spraying station, and a clearcoat spraying station; when the car body is painted, the car body passes through the pre-spraying station, the color paint spraying station, and the clearcoat spraying station in sequence to complete pre-spraying, color paint spraying, and clearcoat spraying, respectively; when the car body is sprayed again, the car body is controlled to pass through the pre-spraying station, the color paint spraying station, and the clearcoat spraying station again, wherein when the car body passes through the pre-spraying station again, the pre-spraying station is controlled not to pre-spray the car body, and when the car body passes through the color paint spraying station and the clearcoat spraying station again, the color paint spraying station is controlled to spray the color paint on the car body and the clearcoat spraying station is controlled to spray the clearcoat on the car body. In this embodiment, repeated spraying is avoided by controlling the pre-spraying station not to pre-spray the car body, and the above effect can be achieved without modifying the structure of the coating production line, thereby reducing costs.

[0022] In some embodiments, in response to the existence of coating defects, the car body with coating defects is re-sprayed, including: in response to the existence of coating defects, the car body with coating defects is marked; and the pre-spraying station is controlled not to pre-spray the marked car body. In this embodiment, the above-mentioned logic control can be realized by writing a corresponding program. After the car body with coating defects reaches the topcoat line, the pre-spraying station is closed to enable automatic passing. The whole process does not require manual intervention, does not require stopping, and does not affect the production rhythm. In some embodiments, the car body with coating defects is marked, including: rewriting the car model code of the car body with coating defects. In this embodiment, the car model code is directly rewritten for the car body with coating defects, which is simple, low-cost, and easy to implement. In some embodiments, the car body with coating defects is sent from the trim line and reaches the topcoat line via the rework line; the car model code is rewritten at the read-write station of the rework line. In this embodiment, the car model code is rewritten on the rework line, which is simple to operate and easy to implement without structural adjustment of the production line. The embodiment of the present application provides a method for painting a car body. By writing a mechanized program, the return spray vehicle automatically modifies the vehicle model code when passing through the read-write station of the repair line after being sent out from the modification line. The topcoat line adds a return spray vehicle program, and the pre-spraying station is closed to enable automatic passage. The entire process does not require manual intervention, does not require stopping, and does not affect the production rhythm.

[0023] In some embodiments, in response to the existence of a coating defect, the automobile body with the coating defect is repainted, and the process further includes: determining the coating where the coating defect is located; and polishing the location of the coating defect on the automobile body. Specifically, in some embodiments, in response to the coating defect being located in the clearcoat coating, the clearcoat coating is polished. In this embodiment, after polishing the clearcoat coating, the clearcoat coating defect can be eliminated, and the color paint is exposed, thereby achieving re-spraying of the color paint and the clearcoat. In some embodiments, in response to the coating defect being located in the color paint coating, the clearcoat coating and the color paint coating are polished. In this embodiment, after polishing the clearcoat coating and the color paint coating, the defects of the color paint coating can be eliminated, and the pre-sprayed coating is exposed, thereby achieving re-spraying of the color paint and the clearcoat.

[0024] According to the second aspect of the present application, an embodiment of the present application further provides a system for painting an automobile body, the system being used to execute the method provided in any embodiment of the first aspect of the present application.

[0025] Based on the above-mentioned embodiments of the present application, in the absence of explicit negation or conflict, the technical features of one embodiment may be beneficially combined with one or more other embodiments.

[0026] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are only for illustration and not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A method for painting an automobile body, characterized in that: include: Pre-spraying the automobile body to form a pre-sprayed coating on the automobile body; Spraying the pre-sprayed automobile body with color paint to form a color paint coating on the automobile body, wherein the color paint coating covers the pre-sprayed coating; Spraying clear varnish on the automobile body after the color paint is sprayed, so as to form a clear varnish coating on the automobile body, wherein the clear varnish coating covers the color paint coating; Determine if there are any coating defects on the car body after clearcoat spraying; In response to the existence of the painting defect, the automobile body with the painting defect is re-sprayed, wherein when the automobile body is re-sprayed, the pre-spraying is not performed, and the color paint spraying and the clear varnish spraying are performed.

2. The method according to claim 1, characterized in that The method is at least partially performed on a topcoat line, which includes a pre-spraying station, a color paint spraying station, and a clear varnish spraying station; When painting the automobile body, the automobile body passes through the pre-spraying station, the color paint spraying station and the clear varnish spraying station in sequence to complete the pre-spraying, the color paint spraying and the clear varnish spraying respectively; When the automobile body is to be sprayed again, the automobile body is controlled to pass through the pre-spraying station, the color paint spraying station and the clear coat spraying station again, wherein when the automobile body passes through the pre-spraying station again, the pre-spraying station is controlled not to pre-spray the automobile body, and when the automobile body passes through the color paint spraying station and the clear coat spraying station again, the color paint spraying station is controlled to spray the color paint on the automobile body and the clear coat spraying station is controlled to spray the clear coat on the automobile body.

3. The method according to claim 2, characterized in that In response to the presence of the coating defect, re-spraying the automobile body having the coating defect comprises: In response to the presence of the paint defect, marking the automobile body having the paint defect; The pre-spraying station is controlled not to pre-spray the marked automobile body.

4. The method according to claim 3, characterized in that Marking the automobile body with the paint defect includes: rewriting the vehicle model code of the automobile body with the paint defect.

5. The method according to claim 4, characterized in that The automobile body with the above-mentioned coating defect is sent out from the trimming line and arrives at the above-mentioned topcoat line via the rework line; The vehicle model code is rewritten at the read-write station of the rework line.

6. The method according to claim 1, characterized in that In response to the presence of the coating defect, re-spraying the automobile body having the coating defect, further comprising: Determining the coating layer where the coating defect is located; The position where the coating defect of the automobile body occurs is polished.

7. The method according to claim 6, characterized in that In response to the painting defect being located in the clear coat layer, the clear coat layer is polished.

8. The method according to claim 6, characterized in that In response to the coating defect being located in the color paint coating, the clear coat and the color paint coating are polished.

9. A system for painting an automobile body, characterized in that: The system is used to execute the method according to any one of claims 1 to 9.

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