Paint spraying method for surface of tool cabinet

Abstract

The invention discloses a paint spraying method for the surface of a tool cabinet, the paint spraying method comprises the steps of matrix treatment, primer spraying and finish paint spraying, the matrix treatment refers to polishing and sand blowing treatment of the paint spraying surface of the tool cabinet, and the surface of the tool cabinet is required to have no obvious concave-convex feeling; in the primer spraying process, two layers are sprayed, a pneumatic paint spraying tool is adopted for spraying, spraying is conducted in a parallel back-and-forth mode, and it is required that the next layer can cover at least two thirds of the spraying lap joint area of the previous layer; after the first time of spraying is completed, second time of spraying is conducted after T hours; and in the finish paint spraying process, the finish paint spraying method is the same as the primer spraying method. By the adoption of the paint spraying method, all paint spraying links are controlled, a large plane is flattened, the defects of pocking marks, whitening and paint flowing are effectively overcome, the spraying specification of the tool cabinet in the paint spraying process is perfected, the requirement in the paint spraying process is solidified, the paint spraying requirement of the tool cabinet body is met, and the paint spraying method is suitable for application and popularization.

Description

Technical Field

[0001] The invention relates to the technical field of sheet metal tool cabinet processing, and in particular to a method for spraying paint on the surface of a tool cabinet. Background Art

[0002] Spray painting is to cover the surface of the products and semi-finished products after they have passed the inspection with a layer of protective film, which can prevent rust and corrosion, and make them beautiful and symbolic. Before spray painting, pre-treatment must be carried out, and the pre-treatment must be carried out to make necessary overall inspections and make partial adjustments according to the process.

[0003] Tool cabinets are suitable for the fixed location management of tools, knives, and parts in the production site, so that the storage and retrieval of items can be truly timely, accurate, efficient and low-consumption. In the field of aerospace manufacturing and processing, a large number of tool cabinets are often needed to place different tools and knives. Since many defects will appear during the processing of the tool cabinet, it is a very important step to level the cabinet surface before painting; at the same time, the cleanliness of the painting environment is also an important factor during the painting process; in addition, in addition to the defects of pitting, there are also white spots in the painting, and if too much is sprayed, there will be defects of paint flow. A qualified painting process must go through the process of substrate treatment, primer spraying and topcoat spraying. In the painting process, if any link is not handled well, the paint orange peel phenomenon may occur. Therefore, in order to meet the technical problems of large-surface painting of tool cabinets, a set of painting methods suitable for large surfaces is provided to meet the painting needs of tool cabinets. Summary of the invention

[0004] The technical problem to be solved by the present invention is to address the problems existing in the background technology, thereby providing a set of painting methods suitable for large planes. By using this painting method, each painting link is controlled to meet the painting needs of a tool cabinet. Specifically, it is a method for painting the surface of a tool cabinet.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for spraying paint on the surface of a tool cabinet, the method comprising the following steps: S1. Base treatment: grinding and sandblasting the painted surface of the tool cabinet, requiring the surface to have no obvious concave and convex feeling; S2. Primer spraying: two layers of primer spraying, using pneumatic spraying tools for spraying, and adopting parallel reciprocating spraying. When spraying back and forth, the next layer is required to cover at least two-thirds of the spraying overlap area of ​​the previous layer; after the first spraying is completed, the second spraying is carried out after T hours, where the T value is: when the ambient temperature is 60-80℃, the interval time is 1h, when the ambient temperature is 40-60℃, the interval time is 2h, when the ambient temperature is 26-40℃, the interval time is 3h, when the ambient temperature is 15-26℃, the interval time is 3.5h, when the ambient temperature is below 15℃, the interval time is 4h; after two spraying, the wet film thickness is ≥100um; S3. Spray topcoat. The topcoat spraying method is the same as the primer spraying method. The topcoat spraying and the second primer spraying should be kept at an interval of T hours, where the T value is: when the ambient temperature is 60-80℃, the interval time is 1h, when the ambient temperature is 40-60℃, the interval time is 1.5h, when the ambient temperature is 26-40℃, the interval time is 2h, when the ambient temperature is 15-26℃, the interval time is 2.5h, when the ambient temperature is below 15℃, the interval time is 3h; after spraying the topcoat, the drying time is at least 12h, and the tool cabinet is obtained after drying.

[0006] Furthermore, in the method for painting the surface of a tool cabinet described in the present invention, during the substrate processing process in step S1, the painted surface of the tool cabinet is polished to remove welding spatter, rust, weld nodules and uneven areas remaining in the substrate processing process; after the polishing treatment, sandblasting treatment is performed, which can not only enhance the adhesion of the flat surface, but also remove surface oil and rust.

[0007] Furthermore, in a method for painting the surface of a tool cabinet described in the present invention, during the substrate treatment process of step S1, if there are pits on the surface of the tool cabinet to be painted, the pits need to be repaired over a large area, and the repairing method is to use a repair agent for repairing, and then sand the repaired area.

[0008] Furthermore, a method for spraying paint on the surface of a tool cabinet described in the present invention is adopted, wherein the repair agent is composed of a mixture of solid ash and a curing agent in a weight ratio of 100:2, and a specific repair method is to scrape and apply the mixed repair agent on the pit for 5-8 minutes, and to cure it after scraping, and the curing time is not less than 1 hour at a temperature of 20°C; after curing, use 240-mesh sandpaper to sand the repaired area, and the treatment is required to be from thick to thin along the center of the repair and extend outward, and there is no obvious bumpy feeling when touched, and the surface smoothness can reach more than 95%; wherein, when a large area repair is required, the solid ash is prepared by mixing atomic putty curing agent and magnetic paint, and for repairing small pores, POLY-PUTTY super solid ash can be used.

[0009] Furthermore, in the method for spraying paint on the surface of a tool cabinet described in the present invention, during the primer spraying process in step S2, after the first coat is dry, it is necessary to check whether there are pits and scratches on the surface. If the above defects exist, they need to be filled with mud yellow filler. After the filling is completed, after drying, grinding and sanding are carried out, and finally a second coat of primer is sprayed again; wherein, the drying time is not less than 5 hours.

[0010] Furthermore, in the method for spraying paint on the surface of a tool cabinet described in the present invention, during the process of spraying the topcoat in step S3, after drying, it is necessary to check whether there are pits and scratch defects on the surface. If the defects exist, they need to be filled with mud yellow filler. After the filling is completed, after drying, it is polished and sanded, and finally two coats of topcoat are sprayed again; wherein, the drying time is not less than 5 hours; large area filling is not allowed, and if the filled area exceeds 25% of the sprayed paint area, the topcoat needs to be removed and the substrate needs to be reprocessed.

[0011] Furthermore, in the method for spraying a tool cabinet surface according to the present invention, the primer is prepared by mixing H06-2 epoxy ester primer and a diluent in a weight ratio of 1:1-1.2, wherein the diluent is hydrogen peroxide water; and the topcoat is H04-2 epoxy ester enamel; Furthermore, the painting method for the surface of a tool cabinet described in the present invention is adopted, and the painting process is carried out in an exhaust-type environmentally friendly spray paint room.

[0012] Furthermore, in the method for spraying paint on the surface of a tool cabinet described in the present invention, the drying is carried out in a paint room, baked at a temperature of 45-60°C for 3-5 hours, and then transferred to a drying room and dried to room temperature.

[0013] Furthermore, using the method for spraying paint on the surface of a tool cabinet described in the present invention, during the process of spraying primer in step S2 and spraying topcoat in step S3, the molding air pressure adopted during spraying is 3.5-4 atmospheres, and the spraying distance is controlled between 20-25 cm.

[0014] Compared with the prior art, the method for spraying paint on the surface of a tool cabinet of the present invention has the following beneficial effects: firstly, the surface of the tool cabinet is treated by grinding and sand blowing, and the welding spatter, rust, weld nodules and uneven places remaining in the substrate processing process are removed by grinding. After grinding, sand blowing is performed, which can not only remove surface oil and rust, but also enhance the adhesion of the plane surface; at the same time, in the substrate processing stage, the surface with pits needs to be repaired by using a repair agent, and the repaired parts are sanded after repairing; then, the surface of the tool cabinet after the substrate treatment is sprayed with primer, and the primer is sprayed in two layers, and the corresponding interval time must be controlled for each spray of paint, so as to avoid pitting, whitening and paint flow defects; finally, the topcoat is sprayed, and the topcoat spraying method is the same as the primer spraying method; in the whole spraying process, an exhaust-type environmentally friendly spraying room is used, so that the paint dust in the spraying process can be quickly extracted, which can reduce the harm to the human body, The primer and topcoat selected are both non-volatile paints, which not only produce less dust but also avoid the orange peel phenomenon of paint.

[0015] It can be seen that by adopting the painting method described in the present invention, each painting link is controlled and the large surface is smoothed, which effectively avoids the defects of pitting, whitening and paint flow, improves the spraying specifications of the tool cabinet during the painting process, solidifies the requirements of the painting process, meets the painting needs of the tool cabinet, and is suitable for promotion and application. DETAILED DESCRIPTION

[0016] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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. Example 1

[0017] This embodiment provides a method for spraying paint on the surface of a tool cabinet, the method comprising the steps of substrate treatment, primer spraying and topcoat spraying, specifically comprising the following steps: S1. Base treatment: grinding and sandblasting the painted surface of the tool cabinet, requiring that the surface has no obvious bumps and depressions; the specific operation method is: grinding the painted surface of the tool cabinet to remove welding spatter, rust, weld nodules and uneven areas left over from the base processing process; after grinding, sandblasting is performed to not only enhance the adhesion of the plane surface, but also remove surface oil and rust; S2. Primer spraying: two layers of primer spraying, using pneumatic spraying tools for spraying, and adopting parallel reciprocating spraying. When spraying back and forth, the next layer is required to cover at least two-thirds of the spraying overlap area of ​​the previous layer; after the first spraying is completed, the second spraying is carried out after T hours, where the T value is: when the ambient temperature is 60-80℃, the interval time is 1h, when the ambient temperature is 40-60℃, the interval time is 2h, when the ambient temperature is 26-40℃, the interval time is 3h, when the ambient temperature is 15-26℃, the interval time is 3.5h, when the ambient temperature is below 15℃, the interval time is 4h; after two spraying, the wet film thickness is ≥100um; During the specific operation process, after the first coat is dry, it is necessary to check whether there are pits and scratches on the surface. If the above defects exist, they need to be filled with mud yellow filler. After filling, after drying, polishing and sanding are carried out, and finally two coats of primer are sprayed again; the drying time is not less than 5 hours.

[0018] S3. Spray topcoat. The topcoat spraying method is the same as the primer spraying method. The topcoat spraying and the second primer spraying should be kept at an interval of T hours, where the T value is: when the ambient temperature is 60-80℃, the interval time is 1h, when the ambient temperature is 40-60℃, the interval time is 1.5h, when the ambient temperature is 26-40℃, the interval time is 2h, when the ambient temperature is 15-26℃, the interval time is 2.5h, when the ambient temperature is below 15℃, the interval time is 3h; after spraying the topcoat, the drying time is at least 12h, and the tool cabinet is obtained after drying. In the specific operation process, after drying, it is necessary to check whether there are pits and scratches on the surface. If the above defects exist, they need to be filled with mud yellow filler. After filling, after drying, polishing and sanding are carried out, and finally two coats of topcoat are sprayed again; the drying time is not less than 5h; large area filling is not allowed. If the filling area exceeds 25% of the spray painting area, the topcoat needs to be removed and the substrate needs to be reprocessed.

[0019] Further, a method for spraying paint on the surface of a tool cabinet described in this embodiment is adopted, and the spraying process is carried out in an exhaust-type environmentally friendly spraying room; the primer is prepared by using H06-2 epoxy ester primer and diluent in a weight ratio of 1:1-1.2, wherein the diluent is hydrogen peroxide water; and the topcoat is H04-2 epoxy ester enamel; the drying is carried out in a paint room, baked at a temperature of 45-60°C for 3-5h, and then transferred to a drying room and dried to room temperature; and in the process of spraying primer in step S2 and spraying topcoat in step S3, the molding air pressure taken during spraying is 3.5-4 atmospheres, and the spraying distance is controlled between 20-25cm. In addition, the spraying method described in this embodiment has corresponding requirements for the spraying environment, oil storage and protection methods. The spraying environment requires ventilation and good lighting conditions, and regular dust removal is also required, and no flammable and explosive items are required. When storing oil at room temperature, it should be sealed in time after opening if it is not used up. During the operation, operators are required to wear protective masks and protective clothing so that they can carry out painting operations. Example 2

[0020] This embodiment is based on the embodiment 1, and adopts the painting method described in this embodiment. During the substrate treatment process, if there are pits on the surface of the tool cabinet to be painted, it is necessary to perform a repair process. The specific operation method is: if there are pits on the surface of the tool cabinet to be painted, it is necessary to perform a large-area repair on the pits. The repair method is to use a repair agent for repair, and then perform a sanding treatment on the repaired area after repairing; the repair agent is composed of a mixture of solid ash and a curing agent in a weight ratio of 100:2. The specific repair method is to scrape and mix evenly on the pits. The repair agent is applied for 5-8 minutes. After application, it needs to be cured. The curing time is not less than 1 hour at a temperature of 20°C. After curing, use 240-grit sandpaper to sand the repaired area. The treatment is required to be from thick to thin along the center of the repair and extend outward. There should be no obvious bumps when touched, and the surface smoothness should be more than 95%. Among them, when large-area repairs are required, the solid ash is prepared by atomic putty curing agent and magnetic paint, and for small pore repairs, POLY-PUTTY super solid ash can be used.

[0021] By adopting the painting method described in the present invention, during the substrate processing process, the surface of the painted plane is ground and sandblasted, and welding spatter, rust, weld nodules and uneven areas remaining in the substrate processing process are removed by grinding; then sandblasting is performed, which can not only enhance the adhesion of the plane surface, but also further remove surface oil and rust. At the same time, in the substrate treatment stage, for larger pits, repair agents are used for repair. After the repair is cured, 240-grit sandpaper is used to sand the repaired area. The treatment is required to be from thick to thin along the center of the repair, extending outward, and there is no obvious bumpy feeling when touched. By leveling the cabinet surface, it is convenient for the subsequent painting process. In the painting process, the primer is sprayed on the surface of the tool cabinet after the substrate treatment. The primer is sprayed in two layers. The corresponding interval time must be controlled for each coat of paint, so as to avoid pitting, whitening and paint flow defects; finally, the topcoat is sprayed, and the topcoat spraying method is the same as the primer spraying method; in the entire spraying process, an exhaust-type environmentally friendly spray paint room is used, so that the paint dust in the painting process can be quickly extracted to reduce harm to the human body, and the selected primer and topcoat are both non-volatile paints, which not only produce less dust, but also avoid the orange peel phenomenon of paint.

[0022] To sum up, by adopting the painting method described in the present invention, each painting link is controlled and the large surface is smoothed, which effectively avoids the defects of pitting, whitening and paint flow, improves the spraying specifications of the tool cabinet during the painting process, solidifies the requirements of the painting process, meets the painting needs of the tool cabinet, and is suitable for promotion and application.

[0023] Other details of the present invention are conventional technologies known to those skilled in the art and are therefore not described in detail.

[0024] The protection scope of the present invention is not limited to the technical solutions disclosed in the specific implementation methods. The above description is only a preferred implementation method of the present invention and does not limit the present invention. Any minor modifications, equivalent substitutions and improvements made according to the technical solutions of the present invention should be included in the protection scope of the technical solutions of the present invention.

Claims

1. A method for spraying paint on the surface of a tool cabinet, characterized in that: The painting method comprises the following steps: S1. Base treatment: grinding and sandblasting the painted surface of the tool cabinet, requiring the surface to have no obvious concave and convex feeling; S2. Primer spraying: two layers of primer are sprayed with pneumatic spraying tools in parallel reciprocating spraying. During reciprocating spraying, the next layer is required to cover at least two-thirds of the overlap area of ​​the previous layer. After the first spraying, the second spraying is carried out after T hours, where the T value is: when the ambient temperature is 60-80℃, the interval time is 1h, when the ambient temperature is 40-60℃, the interval time is 2h, when the ambient temperature is 26-40℃, the interval time is 3h, when the ambient temperature is 15-26℃, the interval time is 3.5h, when the ambient temperature is below 15℃, the interval time is 4h; after two sprayings, the wet film thickness is ≥100um; S3. Spray topcoat. The topcoat spraying method is the same as the primer spraying method. The topcoat spraying and the second primer spraying should be kept at an interval of T hours, where the T value is: when the ambient temperature is 60-80℃, the interval time is 1h, when the ambient temperature is 40-60℃, the interval time is 1.5h, when the ambient temperature is 26-40℃, the interval time is 2h, when the ambient temperature is 15-26℃, the interval time is 2.5h, when the ambient temperature is below 15℃, the interval time is 3h; after spraying the topcoat, the drying time is at least 12h, and the tool cabinet is obtained after drying.

2. A method for spraying paint on the surface of a tool cabinet according to claim 1, characterized in that: In the substrate processing process of step S1, the painted surface of the tool cabinet is polished to remove welding spatter, rust, weld nodules and uneven areas remaining in the substrate processing process; after the polishing treatment, the sandblasting treatment is performed, which can not only enhance the adhesion of the plane surface, but also remove surface oil and rust.

3. The method for spraying paint on the surface of a tool cabinet according to claim 1, characterized in that: During the substrate treatment process of step S1, if there are pits on the surface of the tool cabinet to be painted, the pits need to be repaired over a large area. The repairing method is to use a repair agent to repair, and then sand the repaired area.

4. A method for spraying paint on the surface of a tool cabinet according to claim 3, characterized in that: The repair agent is composed of a mixture of solid ash and a curing agent in a weight ratio of 100:

2. The specific repair method is to scrape the mixed repair agent on the pit for 5-8 minutes. After scraping, it needs to be cured. The curing time is not less than 1 hour at a temperature of 20°C. After curing, use 240-grit sandpaper to sand the repaired area. The treatment is required to be from thick to thin along the center of the repair and extend outward. There should be no obvious bumps when touched, and the surface smoothness should be more than 95%. Among them, when a large area needs to be repaired, the solid ash is prepared by mixing atomic putty curing agent and magnetic paint, and for repairing small pores, POLY-PUTTY super solid ash can be used.

5. The method for spraying paint on the surface of a tool cabinet according to claim 1, characterized in that: During the primer spraying process in step S2, after the first coat is dry, it is necessary to check whether there are pits and scratches on the surface. If the above defects exist, they need to be filled with mud yellow filler. After the filling is completed, after drying, it is polished and sanded, and finally the second coat of primer is sprayed again; wherein, the drying time is not less than 5h.

6. The method for spraying paint on the surface of a tool cabinet according to claim 1, characterized in that: During the step S3 of spraying the topcoat, after drying, it is necessary to check whether there are pits and scratches on the surface. If such defects exist, they need to be filled with mud yellow filler. After filling, after drying, polishing and sanding are carried out, and finally two coats of topcoat are sprayed again; wherein, the drying time is not less than 5h; large area filling is not allowed. If the filling area exceeds 25% of the sprayed area, the topcoat needs to be removed and the substrate needs to be reprocessed.

7. The method for spraying paint on the surface of a tool cabinet according to claim 1, characterized in that: The primer is prepared by mixing H06-2 epoxy ester primer and diluent in a weight ratio of 1:1-1.2, wherein the diluent is hydrogen peroxide water; and the topcoat is H04-2 epoxy ester enamel.

8. The method for spraying paint on the surface of a tool cabinet according to claim 1, characterized in that: The painting process is carried out in an exhaust-type environmentally friendly painting room.

9. The method for spraying paint on the surface of a tool cabinet according to claim 1, characterized in that: The drying is carried out in a paint room at a temperature of 45-60° C. for 3-5 hours, and then transferred to a drying room and dried to room temperature.

10. The method for spraying paint on the surface of a tool cabinet according to claim 1, characterized in that: During the process of spraying the primer in step S2 and the topcoat in step S3, the molding air pressure adopted during spraying is 3.5-4 atmospheres, and the spraying distance is controlled between 20-25 cm.