CN111495983A - Method for controlling plate shape defect of large-belly plate rolled by stainless steel wide and thick cold-hardened plate - Google Patents
Method for controlling plate shape defect of large-belly plate rolled by stainless steel wide and thick cold-hardened plate Download PDFInfo
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- CN111495983A CN111495983A CN202010346267.1A CN202010346267A CN111495983A CN 111495983 A CN111495983 A CN 111495983A CN 202010346267 A CN202010346267 A CN 202010346267A CN 111495983 A CN111495983 A CN 111495983A
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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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/02—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring flatness or profile of strips
Abstract
The invention belongs to the field of cold rolling of stainless steel wide and thick cold-hardened plates, and relates to a method for controlling plate shape defects of a large-belly plate rolled by a stainless steel wide and thick cold-hardened plate, which comprises the following steps: (1) determining the type of the plate shape defects of the big-belly plate by adopting a plate shape identification method of a transverse edge-middle-edge stepping steel plate; (2) adjusting the shape of the plate by adopting an ASU rapid adjustment method; (3) and standardizing the pass rolling speed of the finished product. After the method for controlling the plate shape defect of the large-belly plate rolled by the stainless steel wide and thick cold-hardened plate is adopted, the plate shape defect of rolling the large-belly plate is eliminated, the plate shape quality of the stainless steel wide and thick cold-hardened plate is greatly improved, and the plate shape qualified rate reaches 100%.
Description
Technical Field
The invention relates to cold rolling of a stainless steel wide and thick cold-hardened plate, mainly rolling of a stainless steel cold-hardened plate with the width of more than or equal to 1200mm and the thickness of more than or equal to 2.5mm, and particularly relates to a control method for plate shape defects of a large-belly plate rolled by the stainless steel wide and thick cold-hardened plate.
Background
The stainless steel wide and thick cold-hard plate is a special product for Tai steel key development, has the advantages of high dimensional precision, good surface quality, excellent mechanical property, high plate flatness and the like, is widely used for carriage structural members in the high-speed train industry and hot-pressing templates in the artificial board industry, has high additional profit, and increases the market demand year by year. However, the requirement of customers on the shape of the product is extremely high, the flatness requirement is less than or equal to 5mm/m, and the challenge is brought to the shape control level of a production enterprise. The stainless steel wide and thick cold-hardened plate is rolled by a Sendzimir and SuNDWING twenty-high roll mill, multi-pass reversible rolling is adopted, the stainless steel wide and thick cold-hardened plate has the characteristics of wide width and thick thickness, the self rigidity of the steel plate is high, and the plate shape defects are mainly in the form of a large-belly plate and are different from thin cold-hardened plates. Due to the fact that the operation level is insufficient, the control method is improper, the plate shape defect of the large-belly plate cannot be effectively identified and controlled, follow-up procedures cannot be eliminated, the use of a client is seriously affected, and the production cost is greatly improved.
Disclosure of Invention
The invention aims to provide a method for controlling the plate shape defect of a large-belly plate rolled by a stainless steel wide and thick cold-hard plate aiming at the defects in the prior art.
Specifically, the method for controlling the plate shape defect of the rolled large-belly plate of the stainless steel wide and thick cold-hard plate comprises the following steps:
(1) determining the type of the plate shape defects of the big-belly plate by adopting a plate shape identification method of a transverse edge-middle-edge stepping steel plate;
(2) adjusting the shape of the plate by adopting an ASU rapid adjustment method;
(3) and standardizing the pass rolling speed of the finished product.
The control method for the plate shape defect of the large-belly plate rolled by the stainless steel wide and thick cold-hardened plate comprises the following steps of:
1) when the actual plate shape of the steel plate is basically matched with the preset plate shape curve, stopping the steel plate and removing the tension;
2) an operator uses the body weight to carry out tightness tests in three areas of the edge part, the middle part and the edge part in the width direction of the rolled steel plate;
3) and (5) quantitatively classifying the shape of the big-belly plate.
According to the control method for the plate shape defect of the large-belly rolled plate of the stainless steel wide and thick cold-hardened plate, when the vertical shaking amplitude of the middle part of the steel plate is 1-3cm and the vertical shaking amplitude of the two side parts is less than 1cm, the steel plate is in a shape of a big belly upward plate; when the up-and-down shaking amplitude of the middle part of the steel plate is less than 1cm and the up-and-down shaking amplitude of the two side parts is 1-3cm, the steel plate is of a downward big belly shape; and when the vertical shaking amplitudes of the two side parts and the middle part of the steel plate are less than 1cm, the steel plate is in a flat plate shape.
According to the control method for the plate shape defect of the large-belly plate rolled by the stainless steel wide and thick cold-hardened plate, when the steel plate is in a shape with the belly upward, 5% -15% of ' 3 ', 4 ' and ' 5 ' in the ASU are lifted, and the optimal selection is about 10%.
According to the control method for the plate shape defect of the large-belly rolled plate of the stainless steel wide and thick cold-hardened plate, when the steel plate is in a shape of a big belly downward plate, 5% -15% of ' 3 ', 4 ' and ' 5 ' in an ASU (American society of automotive and medical) are pressed, and the control method is preferably about 10%.
According to the control method for the plate shape defect of the large-belly rolled plate of the stainless steel wide and thick cold-hardened plate, when the steel plate is in a shape with the belly upward, 3, 4 and 5 in the ASU are lifted, so that the middle part of the actual plate shape of the steel plate is lifted by 10-20N/mm higher than two edge parts2。
According to the control method for the plate shape defect of the large-belly rolled plate of the stainless steel wide and thick cold-hardened plate, when the steel plate is in a shape of a big belly downward plate, 3, 4 and 5 in the ASU are pressed, so that the middle part of the actual plate shape of the steel plate is pressed by 10-20N/mm lower than two side parts2。
According to the control method for rolling the plate shape defect of the large-belly plate by using the stainless steel wide and thick cold-hardened plate, the standard pass rolling speed of the finished product is less than or equal to 100 m/min.
The technical scheme of the invention has the following beneficial effects:
(1) the method for controlling the plate shape defect of the large-belly plate rolled by the stainless steel wide and thick cold-hardened plate highly summarizes the operating key points of controlling the plate shape defect of the large-belly plate by the horizontal and longitudinal systems, and has strong operability;
(2) after the method for controlling the plate shape defect of the large-belly plate rolled by the stainless steel wide and thick cold-hardened plate is adopted, the plate shape defect of rolling the large-belly plate is eliminated, the plate shape quality of the stainless steel wide and thick cold-hardened plate is greatly improved, and the plate shape qualified rate reaches 100%;
(3) the operation method for controlling the plate shape defects of the rolled large-belly plate, which is provided by the invention, has the field practical application value, and can quickly and effectively improve the quality control level of the rolled plate shape of the stainless steel wide and thick cold-hard plate.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
FIG. 1 is a schematic diagram of a plate-shaped defect with a big belly facing upwards;
FIG. 2 is a schematic view of a plate shape defect with a big belly facing downward;
fig. 3 is a schematic view of a flat plate shape.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention. The process of the present invention employs conventional methods or apparatus in the art, except as described below. The following noun terms have meanings commonly understood by those skilled in the art unless otherwise specified.
The shape defect of rolling the large-belly plate by the stainless steel wide and thick cold hard plate is that the middle position of the strip steel in the width direction is opposite to the two side parts and is in a bulging shape, and the cross section is in a bow shape.
The on-site tracking finds that the generation mechanism of the plate shape defect of the big-belly plate is that the longitudinal extension of the strip steel in the middle position of the width direction is slightly larger than that of the edge position in the rolling process, and the strip steel presents the plate shape defect form of the big-belly plate due to large width, thick thickness and high self rigidity.
The inventor provides an innovative control idea of transversely adjusting the plate shape and longitudinally stabilizing the plate shape through field attack and conclusion and develops an operation method of one-recognition, two-adjustment and three-low speed.
Specifically, the method for controlling the plate shape defect of the rolled large-belly plate of the stainless steel wide and thick cold-hard plate comprises the following steps:
(1) determining the type of the plate shape defects of the big-belly plate by adopting a plate shape identification method of a transverse edge-middle-edge stepping steel plate;
(2) adjusting the shape of the plate by adopting an ASU rapid adjustment method;
(3) and standardizing the pass rolling speed of the finished product.
The operation method of 'one recognition, two adjustment and three low speeds' highly summarizes the operation key points of controlling the 'big-belly plate' shape defect by the horizontal and longitudinal systems, and has strong operability.
In some preferred embodiments, the method for controlling plate shape defects of rolled large-belly plates of stainless steel wide and thick cold hard plates comprises the following steps:
(1) and determining the type of the plate shape defects of the big-belly plate by adopting a plate shape identification method of stepping on the steel plate at the transverse edge-middle edge.
The plate shape identification method of the transverse edge-middle-edge stepping steel plate comprises the following steps:
1) when the actual plate shape of the steel plate is basically matched with the preset plate shape curve, stopping the steel plate and removing the tension;
2) an operator uses the body weight to carry out tightness tests in three areas of the edge part, the middle part and the edge part in the width direction of the rolled steel plate;
3) and (5) quantitatively classifying the shape of the big-belly plate.
Wherein, the stainless steel wide and thick cold-hard plate is rolled by a Sendzimir and SUNDWING twenty-high roll mill.
Preferably, the method for identifying the shape of the transverse edge-middle-edge stepping steel plate is performed at a position 10m away from the rolling head, and at this time, the actual shape of the steel plate is basically consistent with the preset shape curve.
Wherein, the elasticity test specifically is: an operator stands on the rolled steel plate with tension removed, and bumps the three areas of the edge part, the middle part and the edge part in the width direction of the rolled steel plate up and down by using the weight of the operator, feels the tightness of the three areas of the edge part (operation side), the middle part (width middle part) and the edge part (transmission side), and further effectively identifies the plate shape in the whole width direction.
Summarized by a large number of field tests, the condition that the vertical shaking of 1-3cm is in a plate-shaped loose state is provided; shaking up and down for less than 1cm is in a plate-shaped tight state. And summarizing the following rules for the plate shape:
When the vertical shaking amplitude of the middle part of the steel plate is larger than 3cm, the steel plate shape is an obvious middle wave, and when the vertical shaking amplitude of the two side parts is larger than 3cm, the steel plate shape is a side wave. The stainless steel wide and thick cold-hardened plate has the characteristics of wide width and thick thickness, and the rigidity of the steel plate is high, so that the plate shape defect is mainly in the form of a large-belly plate. The method for controlling the rolled plate shape defects of the stainless steel wide and thick cold hard plate mainly aims at the defects of a large-belly plate form, and does not relate to other types of plate shape defects.
Compared with the laser identification method in the prior art, the plate shape identification method of the transverse edge-middle-edge stepping steel plate avoids the working condition and equipment limitation when a laser emitter is installed, and is convenient, rapid and strong in operability. Moreover, due to the influence of field working conditions (such as uneven adhesion on the surface of rolling oil), the tightness of the strip steel in the width direction cannot be judged by the laser identification method and the visual plate shape identification method, so that the laser identification method and the visual plate shape identification method have limitations.
The method for identifying the plate shape of the transverse edge-middle-edge stepping steel plate can effectively judge the extension conditions of the middle position and the edge position in the width direction of the strip steel and quickly determine the transverse plate shape condition of wide-specification and thick-specification materials.
(2) And (5) adjusting the plate shape by adopting an ASU rapid adjustment method.
Preferably, when the steel plate is in a shape of a plate with a big belly facing upwards, 5 to 15 percent (preferably about 10 percent) of '3, 4 and 5' in the ASU is lifted, so that the middle part of the actual plate shape of the steel plate is lifted by 10 to 20N/mm compared with two side parts2。
Preferably, when the steel plate is in a shape of a downward big belly, 5 to 15 percent (preferably about 10 percent) of '3, 4 and 5' in the ASU is pressed, so that the middle part of the actual shape of the steel plate is pressed by 10 to 20N/mm lower than two side parts2。
The invention can quickly adjust the plate shape to a preset state in a low-speed state by an ASU quick plate shape adjusting method.
(3) And standardizing the pass rolling speed of the finished product.
Specifically, the rolling speed of the finished product pass is regulated to be less than or equal to 100m/min, and preferably, the rolling speed of the finished product pass is 30-100 m/min.
The invention can effectively ensure the roll temperature and the roll shape to be stable in the finished product rolling state and prevent the longitudinal plate shape change fluctuation in the rolling process by standardizing the rolling speed of the finished product pass to be 30-100 m/min.
After the method for controlling the plate shape defect of the large-belly plate rolled by the stainless steel wide and thick cold-hardened plate is adopted, the plate shape defect of rolling the large-belly plate is eliminated, the plate shape quality of the stainless steel wide and thick cold-hardened plate is greatly improved, and the plate shape qualified rate reaches 100%.
Examples
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. Experimental procedures without specifying specific conditions in the following examples were carried out according to conventional methods and conditions.
Example 1
A coil of 301L stainless steel cold-hard plate with the specification of 4.0 x 1250mm is rolled by a SUDWING four-upright-post twenty-high rolling mill, the plate is rolled by 4.0mm at 4.2mm, the rolling pass is 1, the rolling is started for 10m and stopped, the mode of upward big belly is determined by a plate shape identification method of transverse edge-middle-edge steel plate stepping, the rolling speed of 3, 4 and 5 percent in ASU is increased, and the rolling speed of the finished product pass is 50 m/min.
The plate shape identification method of 'transverse edge-middle-edge stepping steel plate' after rolling is checked, the plate shape defect of 'big belly plate' is not found in the steel plate, and the plate shape quality achieves the expected effect.
Example 2
A coil of 301L stainless steel cold hard plate with the specification of 4.0 x 1050mm is rolled by a SUDWING four-upright-post twenty-high rolling mill, the plate is rolled by 4.0mm at 4.2mm, the rolling pass is 1, the rolling is started for 10m and stopped, the mode of upward big belly is determined by a plate shape identification method of transverse edge-middle-edge steel plate stepping, the rolling speed of 3, 4 and 5 percent in ASU is increased, and the rolling speed of the finished product pass is 55 m/min.
The plate shape identification method of 'transverse edge-middle-edge stepping steel plate' after rolling is checked, the plate shape defect of 'big belly plate' is not found in the steel plate, and the plate shape quality achieves the expected effect.
Example 3
Rolling a coil of 301L stainless steel cold hard plate with the specification of 4.0 x 1250mm by adopting a SUDWING four-upright-post twenty-high rolling mill, rolling 4.0mm at 4.817mm, rolling each pass for 2 passes, starting and stopping the rolling of the finished product pass for 10 meters, determining the form of upward big belly by a plate shape identification method of transverse edge-middle-edge steel plate stepping, lifting 3, 4 and 5 in ASU, and rolling at the finished product pass at the speed of 80 m/min.
The plate shape identification method of 'transverse edge-middle-edge stepping steel plate' after rolling is checked, the plate shape defect of 'big belly plate' is not found in the steel plate, and the plate shape quality achieves the expected effect.
Example 4
Rolling a coil of 301L stainless steel cold-hardened plate with the specification of 6.0 x 1250mm by adopting a SUDWING four-upright-post twenty-high rolling mill, rolling for 6.0mm at 6.3mm, rolling for 1 pass, starting and stopping for 10 meters, determining a big-belly downward form by a plate shape identification method of ' transverse edge-middle-edge steel plate ', pressing for 3, 4 and 5 ' in an ASU (automatic stamping Unit) for 10 percent, and rolling for a finished product pass at the rolling speed of 53 m/min.
The plate shape identification method of 'transverse edge-middle-edge stepping steel plate' after rolling is checked, the plate shape defect of 'big belly plate' is not found in the steel plate, and the plate shape quality achieves the expected effect.
The present invention has been disclosed in the foregoing in terms of preferred embodiments, but it will be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention. It should be noted that all changes and substitutions equivalent to those of the embodiments are intended to be included within the scope of the claims of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined in the claims.
Claims (8)
1. A control method for the plate shape defect of a large-belly plate rolled by a stainless steel wide and thick cold-hardened plate is characterized by comprising the following steps:
(1) determining the type of the plate shape defects of the big-belly plate by adopting a plate shape identification method of a transverse edge-middle-edge stepping steel plate;
(2) adjusting the shape of the plate by adopting an ASU rapid adjustment method;
(3) and standardizing the pass rolling speed of the finished product.
2. The method for controlling the plate shape defects of the rolled large-belly plate of the stainless steel wide and thick cold-hard plate according to claim 1, wherein the method for identifying the plate shape of the transverse edge-middle-edge stepping steel plate comprises the following steps:
1) when the actual plate shape of the steel plate is basically matched with the preset plate shape curve, stopping the steel plate and removing the tension;
2) an operator uses the body weight to carry out tightness tests in three areas of the edge part, the middle part and the edge part in the width direction of the rolled steel plate;
3) and (5) quantitatively classifying the shape of the big-belly plate.
3. The method for controlling the plate shape defects of the rolled large-belly plate of the stainless steel wide and thick cold-hard plate according to claim 2, wherein when the amplitude of vertical shaking of the middle part of the steel plate is 1-3cm and the amplitude of vertical shaking of the two side parts is less than 1cm, the steel plate is in a shape of a big-belly upward plate; when the up-and-down shaking amplitude of the middle part of the steel plate is less than 1cm and the up-and-down shaking amplitude of the two side parts is 1-3cm, the steel plate is of a downward big belly shape; and when the vertical shaking amplitudes of the two side parts and the middle part of the steel plate are less than 1cm, the steel plate is in a flat plate shape.
4. The method for controlling the plate shape defect of the rolled large-belly plate of the stainless steel wide and thick cold-hard plate according to claim 3, wherein when the steel plate is in a shape with the belly upward, 5% -15% of 3, 4 and 5 in an ASU is lifted.
5. The method for controlling the plate shape defects of the rolled big-belly plate of the stainless steel wide and thick cold-hard plate according to claim 3, wherein when the steel plate is in a big-belly downward plate shape, 5% -15% of 3, 4, 5 in an ASU is pressed.
6. The method for controlling the plate shape defect of the rolled large-belly plate of the stainless steel wide and thick chilled plate according to claim 3, wherein when the steel plate is in a shape of a belly-up plate, 3, 4 and 5' in the ASU are lifted, so that the middle part of the actual plate shape of the steel plate is 10-20N/mm higher than two edge parts2。
7. The method for controlling the plate shape defect of the rolled large-belly plate of the stainless steel wide and thick chilled plate according to claim 3, wherein when the steel plate is in a shape of a belly-down plate, "3, 4, 5" in the ASU is pressed, so that the middle part of the actual plate shape of the steel plate is pressed by 10-20N/mm lower than two side parts2。
8. The method for controlling the plate shape defects of the rolled large-belly plate of the stainless steel wide and thick cold-hard plate according to claim 1, wherein the rolling speed of a standard finished product pass is less than or equal to 100 m/min.
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| CN202010346267.1A CN111495983A (en) | 2020-04-27 | 2020-04-27 | Method for controlling plate shape defect of large-belly plate rolled by stainless steel wide and thick cold-hardened plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114011883A (en) * | 2021-10-18 | 2022-02-08 | 山西太钢不锈钢股份有限公司 | 300-series stainless steel BA plate bright furnace scratch defect control method |
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