CN110743919A - Surface appearance control method of cold-rolled galvanized product - Google Patents
Surface appearance control method of cold-rolled galvanized product Download PDFInfo
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- CN110743919A CN110743919A CN201910962734.0A CN201910962734A CN110743919A CN 110743919 A CN110743919 A CN 110743919A CN 201910962734 A CN201910962734 A CN 201910962734A CN 110743919 A CN110743919 A CN 110743919A
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- rolled galvanized
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
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Abstract
The invention discloses a surface appearance control method of a cold-rolled galvanized product, which realizes the control of the surface roughness and the peak value of a steel plate by controlling the surface roughness and the peak value of a working roll of a finishing machine, and the surface roughness of the working roll is controlled within the range of 1.5-3.0 um. According to the method for controlling the surface appearance of the cold-rolled galvanized product, the roll surface of the working roll is in a convex spherical shape after being roughened, so that pits are easily generated on the surface of strip steel when the roll is convexly pressed into the strip steel in the rolling process, a closed oil groove is formed, the formability and the coating property of the strip steel are improved, and the product consistency of the cold-rolled galvanized plate is improved.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a surface appearance control method of a cold-rolled galvanized product.
Background
The surface appearance of the cold-rolled steel plate not only has influence on the appearance brightness and the painting performance of a formed part, but also has important influence on the stamping forming performance and the forming process. The final appearance of the surfaces of the cold-rolled sheet and the galvanized sheet is formed by mainly using a textured working roll on a continuous annealing temper mill or a galvanizing finisher. The low roughness and high peak density are more advantageous for improving the press forming of the steel sheet and improving the painting property.
With the increasing environmental requirements and the demand for cost reduction, automobile manufacturers have proposed improvements in coating processes from "3C 2B (intercoat-bake-color paint-varnish-bake, i.e., three-coat-two-bake process)" to "2C 1B (color paint-varnish-bake, two-coat-one-bake process)", which have made higher demands on the surface peaks, roughness, waviness, etc. of substrates.
In the production process of the cold-rolled galvanized sheet, the surface of a cold-rolled working roll is required to be roughened, and then the cold-rolled galvanized sheet meeting the special process requirements of users is rolled. The prior roller surface roughening treatment process is increasingly difficult to meet the requirements of a new coating process, and the rolled cold-rolled galvanized sheet has poor product consistency.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a surface appearance control method of a cold-rolled galvanized product, and aims to improve the product consistency of the cold-rolled galvanized sheet.
In order to achieve the purpose, the invention adopts the technical scheme that: the surface appearance control method of the cold-rolled galvanized product realizes the control of the surface roughness and the peak value of the steel plate by controlling the surface roughness and the peak value of the working roll of the finishing machine, and the surface roughness of the working roll is controlled within the range of 1.5-3.0 um.
The manufacturing process of the working roll comprises the following steps:
s1, manufacturing a roller blank;
and S2, performing texturing treatment on the roll surface of the rolled blank.
In the process of rolling the cold-rolled galvanized product, the concentration of finishing liquid of a finishing machine is controlled within the range of 2.5-3.0%, the substrate passes through the finishing machine, and the appearance of the roll surface of a working roll is copied to the surface of a steel plate.
According to the method for controlling the surface appearance of the cold-rolled galvanized product, the roll surface of the working roll is in a convex spherical shape after being roughened, so that pits are easily generated on the surface of strip steel when the roll is convexly pressed into the strip steel in the rolling process, a closed oil groove is formed, the formability and the coating property of the strip steel are improved, and the product consistency of the cold-rolled galvanized plate is improved.
Drawings
The description includes the following figures, the contents shown are respectively:
FIG. 1 is a cross-sectional view of a work roll surface topography;
FIG. 2 is a cross-sectional view of the surface topography of the plate;
FIG. 3 is a sheet topography microstructure diagram.
Detailed Description
The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings for a purpose of helping those skilled in the art to more fully, accurately and deeply understand the inventive concept and technical solution of the present invention and to facilitate its implementation.
As shown in figures 1 and 2, the invention provides a surface appearance control method of a cold-rolled galvanized product, which realizes the control of the surface roughness and the peak value of a steel plate by controlling the surface roughness and the peak value of a working roll of a finishing machine, and the surface roughness of the working roll is controlled within the range of 1.5-3.0 um.
Specifically, the manufacturing process of the working roll of the finisher comprises the following steps:
s1, manufacturing a roller blank;
s2, roughening the roll surface of the roll blank;
in step S1, the roll surface of the roll blank is ground to make the roll blank free of cutting, diagonal lines, scratches, etc. and to make the roughness and roll profile satisfactory.
In step S2, after grinding, a uniform hemispherical convex hard chrome plating layer with low roughness and high peak density is formed on the roll surface of the roll blank by using an electrochemical chromium plating process, and the roll surface is uniform without color difference, thereby forming a work roll.
In the process of rolling the cold-rolled galvanized product, the concentration of finishing liquid of a finishing machine is controlled within the range of 2.5-3.0%, and the normal work of high-pressure cleaning is ensured. After cleaning, annealing and galvanizing treatment, the substrate passes through a finishing machine, and the appearance of the roll surface of a working roll of the finishing machine is copied to the surface of a steel plate to form the appearance of a target plate surface. The concave pits are formed on the plate surface, so that the surface appearance of the plate belt product with low roughness, high peak value and consistent concave pit depth is realized, and the oil storage property is improved. The board produced by the process has more uniform appearance and better consistency.
And measuring the roughness and the peak value after the flattening or the finishing, and replacing a new working roll when the roughness and the peak value are attenuated to be lower than the target value requirement. If the working roll generates roll marks, color difference and other defects which affect the board surface quality in the using process, a new working roll needs to be replaced.
The invention is described above with reference to the accompanying drawings. It is to be understood that the specific implementations of the invention are not limited in this respect. Various insubstantial improvements are made by adopting the method conception and the technical scheme of the invention; the present invention is not limited to the above embodiments, and can be modified in various ways.
Claims (3)
1. The surface appearance control method of the cold-rolled galvanized product is characterized in that the surface roughness and the peak value of a working roll of a finishing machine are controlled, so that the surface roughness and the peak value of a steel plate are controlled, and the surface roughness of the working roll is controlled within the range of 1.5-3.0 um.
2. The method for controlling the surface topography of a cold-rolled galvanized product according to claim 1, wherein the manufacturing process of the working roll comprises the steps of:
s1, manufacturing a roller blank;
and S2, performing texturing treatment on the roll surface of the rolled blank.
3. The method for controlling the surface topography of a cold-rolled galvanized product according to claim 1 or 2, wherein in the process of rolling the cold-rolled galvanized product, the concentration of a finishing liquid of a finishing machine is controlled within the range of 2.5-3.0%, a substrate passes through the finishing machine, and the surface topography of a working roll is copied to the surface of a steel plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910962734.0A CN110743919A (en) | 2019-10-11 | 2019-10-11 | Surface appearance control method of cold-rolled galvanized product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910962734.0A CN110743919A (en) | 2019-10-11 | 2019-10-11 | Surface appearance control method of cold-rolled galvanized product |
Publications (1)
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| CN110743919A true CN110743919A (en) | 2020-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910962734.0A Pending CN110743919A (en) | 2019-10-11 | 2019-10-11 | Surface appearance control method of cold-rolled galvanized product |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111399452A (en) * | 2020-03-19 | 2020-07-10 | 首钢京唐钢铁联合有限责任公司 | Leveling process optimization method for improving peak density of household appliance plate strip steel |
| CN113578965A (en) * | 2021-07-28 | 2021-11-02 | 江苏沙钢集团有限公司 | Substrate with frosted surface, preparation method thereof and tin plate/chromium plate |
| CN114182079A (en) * | 2021-11-18 | 2022-03-15 | 山东钢铁集团日照有限公司 | Control method for surface rolling lines of cold-rolled deep-drawing steel for outer plate |
| CN115369314A (en) * | 2021-05-20 | 2022-11-22 | 宝山钢铁股份有限公司 | Anti-aging low-waviness bake-hardening hot-dip galvanized steel plate and manufacturing method thereof |
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2019
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111399452A (en) * | 2020-03-19 | 2020-07-10 | 首钢京唐钢铁联合有限责任公司 | Leveling process optimization method for improving peak density of household appliance plate strip steel |
| CN111399452B (en) * | 2020-03-19 | 2023-05-12 | 首钢京唐钢铁联合有限责任公司 | Flattening process optimization method for improving peak density of household electrical appliance plate strip steel |
| CN115369314A (en) * | 2021-05-20 | 2022-11-22 | 宝山钢铁股份有限公司 | Anti-aging low-waviness bake-hardening hot-dip galvanized steel plate and manufacturing method thereof |
| CN113578965A (en) * | 2021-07-28 | 2021-11-02 | 江苏沙钢集团有限公司 | Substrate with frosted surface, preparation method thereof and tin plate/chromium plate |
| CN114182079A (en) * | 2021-11-18 | 2022-03-15 | 山东钢铁集团日照有限公司 | Control method for surface rolling lines of cold-rolled deep-drawing steel for outer plate |
| CN114182079B (en) * | 2021-11-18 | 2024-04-16 | 山东钢铁集团日照有限公司 | Control method for surface rolling lines of cold-rolled deep-drawing steel for outer plate |
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Application publication date: 20200204 |