Surface treatment method for cold-rolled sheet

Abstract

The cold-rolled plate surface treatment method comprises the following steps that S1, a finished plate with local defects is polished, and polishing marks at the defects are in smooth transition; s2, the whole board face of the finished board obtained after manual grinding is subjected to grinding and polishing treatment; s3, the finished board treated in the step S2 is coated with a film, and the other face of the finished board is ground and polished; and S4, the mold on the finished board obtained after grinding and polishing treatment is torn off, then the finished board obtained after film tearing is cleaned and dried, and surface treatment is completed. Compared with the prior art, the method can solve the problems that the finished cold-rolled sheet has the defects of local surface oxide layer residues, surface scratches and the like, and the yield and the use of customers are affected.

Description

Technical Field

[0001] The invention belongs to the technical field of alloy material processing, and in particular relates to a surface treatment method for a cold-rolled plate. Background Art

[0002] During the annealing, alkali blasting, pickling and cut-to-length cutting process of high-temperature alloy cold-rolled plates, due to the limitations of tooling equipment and other force majeure factors, some finished products have defects such as local surface oxide layer residue and surface scratches, which affect the yield rate and customer use. Summary of the invention

[0003] The purpose of the present invention is to provide a surface treatment method for cold-rolled sheet in order to solve the problem that the finished cold-rolled sheet has defects such as residual local surface oxide layer and surface scratches, which affect the yield rate and customer use.

[0004] In order to achieve the above object, the present invention provides a surface treatment method for a cold-rolled sheet, which comprises the following steps:

[0005] S1: Grind the finished plate with local defects, and make the defect marks smooth transition;

[0006] S2: Grind and polish the entire surface of the finished board after manual grinding;

[0007] S3: Laminating the finished plate processed in step S2, and grinding and polishing the other side;

[0008] S4: tear off the mold on the finished board after grinding and polishing, and then clean and dry the finished board after tearing the film to complete the surface treatment.

[0009] As a further description of the above technical solution:

[0010] The step S1 is to manually grind the local defects of the finished plate, and then clean and dry the polished metal plate.

[0011] As a further description of the above technical solution:

[0012] In step S2, an oil-grinding wire drawing machine is used for grinding and polishing.

[0013] As a further description of the above technical solution:

[0014] In step S2, a 180-mesh sand belt is used to perform 2 to 4 grinding and polishing processes.

[0015] As a further description of the above technical solution:

[0016] The step S2 is to grind and polish the entire surface of the finished plate by composite shot peening.

[0017] As a further description of the above technical solution:

[0018] The composite shot peening includes a first shot peening and a second shot peening, the first shot peening uses ceramic shots, and the second shot peening uses steel shots; the shot peening intensity of the first shot peening is 0.6-1.1 mmA, the coverage is 100%-200%, and the working distance is 40-100 mm; the shot peening intensity of the second shot peening is 0.2-0.6 mmA, the coverage is 100%-200%, and the working distance is 40-110 mm.

[0019] As a further description of the above technical solution:

[0020] The diameter of the steel shot and the diameter of the ceramic shot are both between 0.2 mm and 0.3 mm.

[0021] As a further description of the above technical solution:

[0022] The finished board with the film torn off in step S4 is placed in an aqueous solution to form a conductive circuit, a high voltage is applied between the finished board and the counter electrode, a plasma micro-arc is formed on the surface of the finished board, and the glue layer and old oxide scale on the surface of the finished board are removed and peeled off by the high temperature and high pressure effect of the plasma micro-arc.

[0023] As a further description of the above technical solution:

[0024] The aqueous solution contains one or more of sodium hydroxide, sodium silicate and sodium dodecylbenzene sulfonate.

[0025] To sum up, due to the adoption of the above-mentioned technical scheme, the beneficial effects of the present invention are: the surface of the defective plate can be processed, the surface defects of the plate can be eliminated, and a qualified plate can be obtained, and the secondary processing of the finished plate can be realized. The defects can be repaired without destroying the internal structure of the finished plate, thereby reducing material waste and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 The present invention is a flow chart of a surface treatment method for cold-rolled sheet. DETAILED DESCRIPTION

[0028] In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0030] Implementation 1:

[0031] See also Figure 1 The present invention provides a surface treatment method for a cold-rolled sheet, comprising the following steps:

[0032] S1: Grind the finished plate with local defects, and make the defect marks smooth transition;

[0033] S2: Grind and polish the entire surface of the finished board after manual grinding;

[0034] S3: Laminating the finished board processed in step S2, and grinding and polishing the other side; this can protect the surface and prevent secondary damage during the processing;

[0035] S4: tear off the mold on the finished board after grinding and polishing, and then clean and dry the finished board after tearing the film to complete the surface treatment.

[0036] The step S1 is to manually grind the local defects of the finished plate, and then clean and dry the polished metal plate.

[0037] The finished plates with local defects are manually polished, and the polishing marks have a smooth transition. Obvious steps and pits visible to the naked eye are not allowed. The thickness of the plate is within the tolerance range after polishing. Diamond sandpaper is used for polishing. The polished aluminum alloy sheet is cleaned with acetone to remove pollutants such as grease, and then dried.

[0038] In one embodiment, the step S2 uses an oil-grinding wire drawing machine for grinding and polishing. The step S2 uses a 180-mesh sand belt for 2 to 4 times of grinding and polishing.

[0039] Use an oil-grinding wire drawing machine to polish the entire surface of the finished board after manual grinding. Polish one side first, then polish the other side; use a 180-mesh sanding belt, control the current and use a small amount of cutting, and polish 2 to 3 times to remove the manual grinding marks on the surface to achieve a consistent appearance. According to quality requirements, control the surface roughness (Ra) in the range of 0.1 to 0.8m.

[0040] In another embodiment, the step S2 uses a composite shot peening method to grind and polish the entire surface of the finished plate.

[0041] The composite shot peening includes the first shot peening and the second shot peening. The first shot peening uses ceramic shot and the second shot peening uses steel shot. The shot peening intensity of the first shot peening is 0.6-1.1mmA, the coverage is 100%-200%, and the working distance is 40-100mm. The shot peening intensity of the second shot peening is 0.2-0.6mmA, the coverage is 100%-200%, and the working distance is 40-110mm. The composite shot peening method is used to make the surface performance of the finished plate uniform, which has the characteristics of strong operability, less process flow, low processing cost, and can realize automated production. This method makes the surface performance of the finished plate uniform, stable and reliable.

[0042] The diameter of the steel shot and the diameter of the ceramic shot are both between 0.2 mm and 0.3 mm.

[0043] The finished board with the film torn off in step S4 is placed in an aqueous solution to form a conductive circuit, a high voltage is applied between the finished board and the counter electrode, a plasma micro-arc is formed on the surface of the finished board, and the glue layer and old oxide scale on the surface of the finished board are removed and peeled off by the high temperature and high pressure effect of the plasma micro-arc.

[0044] In this way, the glue layer and old oxide scale on the surface of the finished board can be removed, so that the appearance quality of the finished board is consistent, the roughness meets the requirements, the thickness is thinned by 0.05 to 0.06 mm, within the thickness tolerance range, and meets the use requirements.

[0045] The aqueous solution contains one or more of sodium hydroxide, sodium silicate and sodium dodecylbenzene sulfonate.

[0046] In summary, due to the adoption of the above-mentioned technical scheme, the beneficial effects of the present invention are: the surface of the defective plate can be processed, the surface defects of the plate can be eliminated, the appearance quality of the finished plate is consistent, the roughness meets the requirements, the thickness is thinned by 0.05 to 0.06 mm, and within the thickness tolerance range, the use requirements are met, and a qualified plate is obtained, and secondary processing of the finished plate is realized. Defects can be repaired without destroying the internal structure of the finished plate, reducing material waste and saving costs.

[0047] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for surface treatment of a cold-rolled sheet, characterized in that: The following steps are involved: S1: Grind the finished plate with local defects, and make the defect marks smooth transition; S2: Grind and polish the entire surface of the finished board after manual grinding; S3: Laminating the finished plate processed in step S2, and grinding and polishing the other side; S4: tear off the mold on the finished board after grinding and polishing, and then clean and dry the finished board after tearing the film to complete the surface treatment.

2. A cold-rolled sheet surface treatment method according to claim 1, characterized in that: The step S1 is to manually grind the local defects of the finished plate, and then clean and dry the polished metal plate.

3. A cold-rolled sheet surface treatment method according to claim 1, characterized in that: In step S2, an oil-grinding wire drawing machine is used for grinding and polishing.

4. A cold-rolled sheet surface treatment method according to claim 1, characterized in that: In step S2, a 180-mesh sand belt is used to perform 2 to 4 grinding and polishing processes.

5. A cold-rolled sheet surface treatment method according to claim 1, characterized in that: The step S2 is to grind and polish the entire surface of the finished plate by composite shot peening.

6. A cold-rolled sheet surface treatment method according to claim 5, characterized in that: The composite shot peening includes a first shot peening and a second shot peening, the first shot peening uses ceramic shots, and the second shot peening uses steel shots; the shot peening intensity of the first shot peening is 0.6-1.1 mmA, the coverage is 100%-200%, and the working distance is 40-100 mm; the shot peening intensity of the second shot peening is 0.2-0.6 mmA, the coverage is 100%-200%, and the working distance is 40-110 mm.

7. A cold-rolled sheet surface treatment method according to claim 6, characterized in that: The diameter of the steel shot and the diameter of the ceramic shot are both between 0.2 mm and 0.3 mm.

8. A cold-rolled sheet surface treatment method according to claim 1, characterized in that: The finished board with the film torn off in step S4 is placed in an aqueous solution to form a conductive circuit, a high voltage is applied between the finished board and the counter electrode, a plasma micro-arc is formed on the surface of the finished board, and the glue layer and old oxide scale on the surface of the finished board are removed and peeled off by the high temperature and high pressure effect of the plasma micro-arc.

9. A cold-rolled sheet surface treatment method according to claim 8, characterized in that: The aqueous solution contains one or more of sodium hydroxide, sodium silicate and sodium dodecylbenzene sulfonate.

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