CN107626971B - Method for reducing edge shearing amount of strip steel - Google Patents
Method for reducing edge shearing amount of strip steel Download PDFInfo
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- CN107626971B CN107626971B CN201610562584.0A CN201610562584A CN107626971B CN 107626971 B CN107626971 B CN 107626971B CN 201610562584 A CN201610562584 A CN 201610562584A CN 107626971 B CN107626971 B CN 107626971B
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Abstract
The invention relates to a method for reducing the edge shearing amount of strip steel, which is suitable for the production of cold-rolled silicon steel and comprises the following steps: 1) classifying the edge crack defect condition of the coil of strip which is off the production line of the rolling mill: 2) for the A-type edge crack defect, cutting the edge by adopting a single-edge cutting method; 3) for B-type and C-type edge crack defects, an unequal shearing method is adopted: 4) in the process of threading the cold rolling mill, the positions of the deviation correcting roller and the strip steel are adjusted to coincide with the center position of the production line; 5) when the cold rolling mill starts, the strip steel runs at a low speed, and is measured for multiple times, and the uneven edge shearing amount is found and adjusted in time through a manual deviation device; in addition, tension during rolling in special conditions is controlled: according to the invention, the set value is input in a double-side trimming mode in the automatic control system of the trimming unit, and then the method of manual adjustment according to actual needs is adopted, so that the minimum trimming amount of the strip steel is realized, the product yield is improved, and the production cost is reduced.
Description
Technical Field
The invention relates to the technical field of cold-rolled strip steel, in particular to a method for reducing the edge shearing amount of strip steel in the production of cold-rolled silicon steel.
Background
In steel products, cold-rolled silicon steel is used for manufacturing iron cores of various motors and transformers, is an indispensable important soft magnetic alloy in the industries of electric power, electronics and military industry, is also an energy-saving important metal functional material, is a product with high technical content which is urgently needed in China, and can be produced as an expression of the comprehensive strength of national steel due to complex production process and more control difficulties.
As the yield strength and the tensile strength of the cold-rolled silicon steel are obviously improved along with the increase of the silicon content, the elongation is obviously reduced, and the hardness is rapidly increased, a twenty-high roll mill is required for rolling, the gaps at the rolled part are more, and the cold-rolled silicon steel can enter an annealing process for continuous production after edge cutting treatment.
At present, in domestic cold-rolled silicon steel manufacturers commonly remove cracks after rolling by adopting an edge shearing mode, an edge shearing unit is controlled by an automatic control system, but when the edge shearing amount of two sides of a single-side edge shearing or double-side edge shearing is different, the center of a strip steel after edge shearing deviates from the center of a production line, so that the influence on subsequent operation is great; if the two sides of the steel plate are cut by the same edge cutting amount, the influence on the yield is large, and the production cost is high.
Disclosure of Invention
The invention provides a method for reducing the edge shearing amount of strip steel, which is characterized in that the minimum edge shearing amount of the strip steel is realized by adopting a method of inputting a set value in a double-side edge shearing mode in an automatic control system of an edge shearing unit and manually adjusting according to actual needs, so that the product yield is improved, and the production cost is reduced.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for reducing the edge shearing amount of strip steel is suitable for the production of cold-rolled silicon steel and comprises the following steps:
1) classifying the edge crack defect condition of the coil of strip which is off the production line of the rolling mill:
class a edge crack defect: one side of the transmission side or the operation side has edge crack, and the other side has no edge crack;
b type edge crack defect: edge cracks exist on two sides of the steel coil, and the depth and the size of the edge cracks on the two sides are basically consistent;
c type edge crack defect: edge cracks exist on two sides of the steel coil, but one side of the steel coil is obviously more serious than the other side of the steel coil;
2) for the A-type edge crack defect, a single-edge shearing method is adopted, and the method specifically comprises the following steps:
a. in order to ensure that the center of the trimmed back plate does not deviate from the center of the production line, firstly, parameter setting is carried out in an automatic control system of a trimming machine set according to a bilateral trimming mode, and trimming set values on two sides are trimming values required by one side;
b. manually moving a disc shear at one side without trimming out of the plate edge by 50-80 mm according to the reference measurement plate width, wherein the disc shear at the side is not in contact with the strip steel in the running process of the strip steel, and meanwhile, the strip steel is pressed by a rubber sleeve at the side to prevent the strip steel from deviating or shaking;
3) for B-type and C-type edge crack defects, an unequal shearing method is adopted, and the method specifically comprises the following steps:
a. setting the width according to a bilateral shearing mode, wherein in order to ensure that the center of a trimmed back plate does not deviate from the center of a production line, the trimming amounts of an operation side and a transmission side are set in an equivalent manner, and the setting values are average values obtained by adding the trimming amounts of the two sides respectively;
b. correcting offset in an offset interface set by the width of an automatic control system of the trimming unit to ensure that trimming amount of an operation side and a transmission side conforms to actual requirements;
4) the threading process of the cold rolling mill comprises the following steps:
a. adjusting the position of a deviation correcting roller in front of the rotary shears to enable the deviation correcting roller to be superposed with the center position of the production line;
b. after the strip steel reaches the deviation correcting roller in the strip threading process, the strip steel is centered by using a welding machine centering device, and then the deviation correcting roller is pressed;
5) and (3) later tracking adjustment:
a. when the cold rolling mill starts, the strip steel runs at a low speed of less than or equal to 30m/min, the width of the strip steel is measured for multiple times, tracking inspection is carried out in time, and the uneven edge shearing amount is found and adjusted in time through a manual offset device;
b. because the oriented silicon steel is thin and brittle, the oriented silicon steel needs to be coiled after tension is applied, in order to prevent the steel plate from being damaged by overlarge tension and prevent turriform coiling, the tension in the following conditions during rolling is controlled:
NGO non-oriented silicon steel, when the plate width is more than 1150mm, the tension set value is 20-25N;
the tension set value of the CGO common oriented silicon steel is 20-25N when the thickness of a plate in a first rolling process is 0.5-0.62 mm;
the tension set value of CGO common oriented silicon steel is 10-15N when the plate thickness is less than 0.3 mm;
the tension setting value of the semi-finished product of the rolling mill is 22-28N when the plate thickness is 0.62-1.52 mm.
Compared with the prior art, the invention has the beneficial effects that:
1) for steel coils with different side cracking degrees on two sides, a set value is input in a double-side edge shearing mode, and then unequal edge shearing is carried out by correcting offset, so that the yield is improved, and the waste amount is reduced;
2) for a steel coil with edge crack defects on one side, a set value is input in a double-side edge shearing mode, and then the disc shear on the side without edge shearing is manually moved out for single-side shearing, so that the yield is improved, and the waste amount is reduced;
3) for products with serious edge cracks, the mode of on-line offset shearing at any time reduces the amount of shearing waste products.
Detailed Description
The invention relates to a method for reducing the edge shearing amount of strip steel, which is suitable for the production of cold-rolled silicon steel and comprises the following steps:
1) classifying the edge crack defect condition of the coil of strip which is off the production line of the rolling mill:
class a edge crack defect: one side of the transmission side or the operation side has edge crack, and the other side has no edge crack;
b type edge crack defect: edge cracks exist on two sides of the steel coil, and the depth and the size of the edge cracks on the two sides are basically consistent;
c type edge crack defect: edge cracks exist on two sides of the steel coil, but one side of the steel coil is obviously more serious than the other side of the steel coil;
2) for the A-type edge crack defect, a single-edge shearing method is adopted, and the method specifically comprises the following steps:
a. in order to ensure that the center of the trimmed back plate does not deviate from the center of the production line, firstly, parameter setting is carried out in an automatic control system of a trimming machine set according to a bilateral trimming mode, and trimming set values on two sides are trimming values required by one side;
b. manually moving a disc shear at one side without trimming out of the plate edge by 50-80 mm according to the reference measurement plate width, wherein the disc shear at the side is not in contact with the strip steel in the running process of the strip steel, and meanwhile, the strip steel is pressed by a rubber sleeve at the side to prevent the strip steel from deviating or shaking;
3) for B-type and C-type edge crack defects, an unequal shearing method is adopted, and the method specifically comprises the following steps:
a. setting the width according to a bilateral shearing mode, wherein in order to ensure that the center of a trimmed back plate does not deviate from the center of a production line, the trimming amounts of an operation side and a transmission side are set in an equivalent manner, and the setting values are average values obtained by adding the trimming amounts of the two sides respectively;
b. correcting offset in an offset interface set by the width of an automatic control system of the trimming unit to ensure that trimming amount of an operation side and a transmission side conforms to actual requirements;
4) the threading process of the cold rolling mill comprises the following steps:
a. adjusting the position of a deviation correcting roller in front of the rotary shears to enable the deviation correcting roller to be superposed with the center position of the production line;
b. after the strip steel reaches the deviation correcting roller in the strip threading process, the strip steel is centered by using a welding machine centering device, and then the deviation correcting roller is pressed;
5) and (3) later tracking adjustment:
a. when the cold rolling mill starts, the strip steel runs at a low speed of less than or equal to 30m/min, the width of the strip steel is measured for multiple times, tracking inspection is carried out in time, and the uneven edge shearing amount is found and adjusted in time through a manual offset device;
b. because the oriented silicon steel is thin and brittle, the oriented silicon steel needs to be coiled after tension is applied, in order to prevent the steel plate from being damaged by overlarge tension and prevent turriform coiling, the tension in the following conditions during rolling is controlled:
NGO non-oriented silicon steel, when the plate width is more than 1150mm, the tension set value is 20-25N;
the tension set value of the CGO common oriented silicon steel is 20-25N when the thickness of a plate in a first rolling process is 0.5-0.62 mm;
the tension set value of CGO common oriented silicon steel is 10-15N when the plate thickness is less than 0.3 mm;
the tension setting value of the semi-finished product of the rolling mill is 22-28N when the plate thickness is 0.62-1.52 mm.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ examples ] A method for producing a compound
1) Classifying the edge crack defect condition of the coil of strip which is off the production line of the rolling mill:
class a edge crack defect: one side of the transmission side or the operation side has edge crack, and the other side has no edge crack;
b type edge crack defect: edge cracks exist on two sides of the steel coil, and the depth and the size of the edge cracks on the two sides are basically consistent;
c type edge crack defect: edge cracks exist on two sides of the steel coil, but one side of the steel coil is obviously more serious than the other side of the steel coil;
2) for the A-type edge crack defect, a single-edge shearing method is adopted for shearing the edge, and the method specifically comprises the following steps:
in order to ensure that the center of the trimmed back plate does not deviate from the center of the production line, firstly, parameter setting is carried out in an automatic control system of a trimming machine set according to a bilateral trimming mode, and trimming set values on two sides are trimming values required by one side; if the trimming value is required to be '20 mm for trimming at the transmission side', data are set according to the double-sided shears, namely the trimming values of the transmission side and the operation side are set to be 20mm, then the disc shears at the operation side are manually moved out by 50-80 mm according to the measured plate width, the disc shears at the side are not in contact with the strip steel in the running process of the strip steel, and meanwhile, the strip steel is pressed by a rubber sleeve at the side, so that the strip steel is prevented from deviating or shaking;
3) the unequal shearing method comprises the following steps:
setting the width according to a bilateral shearing mode, wherein in order to ensure that the center of a trimmed back plate does not deviate from the center of a production line, the trimming amounts of an operation side and a transmission side are set in an equivalent manner, and the setting values are average values obtained by adding the trimming amounts of the two sides respectively; if the trimming requirements are '20 mm for the trimming at the transmission side and 10mm for the trimming at the operation side', the trimming amount at the two sides is added to be 30mm, and the trimming amount at the two sides is set according to the average value of 15 mm.
Correcting offset in an offset interface set by the width of an automatic control system of the trimming unit to ensure that trimming amount of an operation side and a transmission side conforms to actual requirements; if "+ 5" is input in the above example, the trimming requirement of "10 mm for the trimming on the operation side and 20mm for the trimming on the transmission side" is achieved.
4) The threading process of the cold rolling mill comprises the following steps:
a. adjusting the position of a deviation correcting roller in front of the rotary shears to enable the deviation correcting roller to be superposed with the center position of the production line;
b. after the strip steel reaches the deviation correcting roller in the strip threading process, the strip steel is centered by using a welding machine centering device, and then the deviation correcting roller is pressed;
5) and (3) later tracking adjustment:
a. when the cold rolling mill starts, the strip steel runs at a low speed of 30m/min, the width of the strip steel is measured for multiple times, tracking inspection is carried out in time, and the uneven edge shearing amount is found and adjusted in time through a manual offset device;
b. because the oriented silicon steel is thin and brittle, the oriented silicon steel needs to be coiled after tension is applied, in order to prevent the steel plate from being damaged by overlarge tension and prevent turriform coiling, the tension in the following conditions during rolling is controlled:
NGO non-oriented silicon steel, when the plate width is more than 1150mm, the tension set value is 20-25N;
the tension set value of the CGO common oriented silicon steel is 20-25N when the thickness of a plate in a first rolling process is 0.5-0.62 mm;
the tension set value of CGO common oriented silicon steel is 10-15N when the plate thickness is less than 0.3 mm;
the tension setting value of the semi-finished product of the rolling mill is 22-28N when the plate thickness is 0.62-1.52 mm.
In the embodiment, after the measures are adopted, the yield is improved by about 1.2%, and the waste products can be reduced by 70 tons and the loss can be reduced by more than 70 ten thousand yuan according to 6 ten thousand tons produced per year. Meanwhile, the use amount of the cutting edge is reduced by 8 sheets/month, the accumulated cost is reduced by about 8 ten thousand yuan, and good economic benefit is obtained.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (1)
1. A method for reducing the edge shearing amount of strip steel is suitable for the production of cold-rolled silicon steel, and is characterized by comprising the following steps:
1) classifying the edge crack defect condition of the coil of strip which is off the production line of the rolling mill:
class a edge crack defect: one side of the transmission side or the operation side has edge crack, and the other side has no edge crack;
b type edge crack defect: edge cracks exist on two sides of the steel coil, and the depth and the size of the edge cracks on the two sides are basically consistent;
c type edge crack defect: edge cracks exist on two sides of the steel coil, but one side of the steel coil is obviously more serious than the other side of the steel coil;
2) for the A-type edge crack defect, a single-edge shearing method is adopted, and the method specifically comprises the following steps:
a. in order to ensure that the center of the trimmed back plate does not deviate from the center of the production line, firstly, parameter setting is carried out in an automatic control system of a trimming machine set according to a bilateral trimming mode, and trimming set values on two sides are trimming values required by one side;
b. manually moving a disc shear at one side without trimming out of the plate edge by 50-80 mm according to the reference measurement plate width, wherein the disc shear at the side is not in contact with the strip steel in the running process of the strip steel, and meanwhile, the strip steel is pressed by a rubber sleeve at the side to prevent the strip steel from deviating or shaking;
3) for B-type and C-type edge crack defects, an unequal shearing method is adopted, and the method specifically comprises the following steps:
a. setting the width according to a bilateral shearing mode, wherein in order to ensure that the center of a trimmed back plate does not deviate from the center of a production line, the trimming amounts of an operation side and a transmission side are set in an equivalent manner, and the setting values are average values obtained by adding the trimming amounts of the two sides respectively;
b. correcting offset in an offset interface set by the width of an automatic control system of the trimming unit to ensure that trimming amount of an operation side and a transmission side conforms to actual requirements;
4) the threading process of the cold rolling mill comprises the following steps:
a. adjusting the position of a deviation correcting roller in front of the rotary shears to enable the deviation correcting roller to be superposed with the center position of the production line;
b. after the strip steel reaches the deviation correcting roller in the strip threading process, the strip steel is centered by using a welding machine centering device, and then the deviation correcting roller is pressed;
5) and (3) later tracking adjustment:
a. when the cold rolling mill starts, the strip steel runs at a low speed of less than or equal to 30m/min, the width of the strip steel is measured for multiple times, tracking inspection is carried out in time, and the uneven edge shearing amount is found and adjusted in time through a manual offset device;
b. because the oriented silicon steel is thin and brittle, the oriented silicon steel needs to be coiled after tension is applied, in order to prevent the steel plate from being damaged by overlarge tension and prevent turriform coiling, the tension in the following conditions during rolling is controlled:
NGO non-oriented silicon steel, when the plate width is more than 1150mm, the tension set value is 20-25N;
the tension set value of the CGO common oriented silicon steel is 20-25N when the thickness of a plate in a first rolling process is 0.5-0.62 mm;
the tension set value of CGO common oriented silicon steel is 10-15N when the plate thickness is less than 0.3 mm;
the tension setting value of the semi-finished product of the rolling mill is 22-28N when the plate thickness is 0.62-1.52 mm.
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| CN113145646B (en) * | 2021-04-23 | 2021-12-10 | 无锡普天铁心股份有限公司 | Process for improving edge cracking of silicon steel edge |
| CN113751517B (en) * | 2021-09-13 | 2023-07-14 | 鞍钢股份有限公司 | Control method for improving cold rolling strip breakage of high-grade non-oriented silicon steel |
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| CN202045408U (en) * | 2011-01-30 | 2011-11-23 | 宝山钢铁股份有限公司 | Stepwise side shearing device |
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| CN203018827U (en) * | 2013-01-04 | 2013-06-26 | 江苏沙钢集团有限公司 | Improved structure of plate combined shearing mechanism |
| CN104841697A (en) * | 2015-05-15 | 2015-08-19 | 南京钢铁股份有限公司 | Control method for automatically preventing steel plate from deflection in shearing process of bilateral scissors |
| CN205183900U (en) * | 2015-11-30 | 2016-04-27 | 郑州金泰制罐有限公司 | Metal sheet automatic cutout production line |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3741219A1 (en) * | 1987-12-05 | 1989-06-15 | Schloemann Siemag Ag | Device for trimming the longitudinal edges of running rolled band |
| JP2000225512A (en) * | 1999-02-09 | 2000-08-15 | Nippon Steel Corp | Side trimmer device |
| CN1262377C (en) * | 2000-11-04 | 2006-07-05 | Sms迪马格股份公司 | Compact rotary shears |
| CN102892696A (en) * | 2010-03-16 | 2013-01-23 | 株式会社尼利可 | Web center position control device, method and program, and web trimming device |
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| CN202639484U (en) * | 2012-05-25 | 2013-01-02 | 天津力神电池股份有限公司 | Rolling machine double trimming device |
| CN203018827U (en) * | 2013-01-04 | 2013-06-26 | 江苏沙钢集团有限公司 | Improved structure of plate combined shearing mechanism |
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