CN111254265B - Method and device for improving internal stress distribution of strip steel - Google Patents
Method and device for improving internal stress distribution of strip steel Download PDFInfo
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- CN111254265B CN111254265B CN201911410946.4A CN201911410946A CN111254265B CN 111254265 B CN111254265 B CN 111254265B CN 201911410946 A CN201911410946 A CN 201911410946A CN 111254265 B CN111254265 B CN 111254265B
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- strip steel
- internal stress
- reverse bending
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0242—Flattening; Dressing; Flexing
Abstract
A method and a device for improving the internal stress distribution of strip steel are provided, the method comprises the following steps: the method comprises the following steps that a reverse bending roller with a preset roller diameter is arranged at the uncoiling position of strip steel of an uncoiler of a unit, and the strip steel is bent reversely at the uncoiling position through the reverse bending roller; adjusting the position of the reverse bending roller to enable the strip steel to generate a preset wrap angle on the reverse bending roller, and fully reversely bending the strip steel by utilizing the roller diameter of the reverse bending roller to convert irregular original internal stress of the strip steel into internal stress in a regular double-fold line distribution form; arranging a straightening machine behind the steering roller, and utilizing the straightening machine to enable the strip steel to be bent forwards and backwards for multiple times, so that the internal stress distributed by double folding lines is converted into the internal stress distributed by multiple folding lines, and the uniform internal stress distribution is subjected to homogenization treatment; uncoiling the cold-rolled or hot-rolled strip steel coil. The invention achieves the effect of improving the distribution of the internal stress of the strip steel, and can not generate a plurality of quality defects caused by the release of the internal stress in the subsequent processing.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a method and a device for improving the internal stress distribution of strip steel.
Background
In the production of strip steel, hot rolled steel coils are cooled from high temperature to room temperature through laminar cooling and indoor air cooling or cold rolled strip steel is annealed and cooled, the phenomenon of uneven cooling can be generated due to different temperature drops of the inner part, the outer part, the edge part and the middle part, the surface layer and the inner layer of the steel coils, irregular internal stress is generated in the strip steel, and in the subsequent rolling, shearing, aging and other processing, the internal stress is continuously released to generate quality defects of wave shape, buckling, side bending and the like, so that the quality of finished products is seriously influenced, and a plurality of quality objections are caused.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for improving the internal stress distribution of strip steel, which aims to improve the internal stress of the strip steel and improve the original irregularly distributed internal stress into regular and uniform internal stress distribution, and the technical scheme of the invention is as follows:
as a first aspect of the present invention, there is provided a method of improving stress distribution in a steel strip, the method comprising the steps of:
step 1, arranging a reverse bending roller with a preset roller diameter at a strip steel uncoiling position of an uncoiler of a unit, and forming reverse bending on the strip steel at the uncoiling position through the reverse bending roller;
and 4, uncoiling the cold-rolled or hot-rolled strip steel coil.
Further, in order to fully reversely bend the strip steel at the reverse bending roller and ensure the consistency of the internal stress of the strip steel in the length direction, the following requirements are met simultaneously:
a, the ratio of the radius of the reverse bending roller to the elastic bending radius of the strip steel is less than or equal to 5;
b, the wrap angle formed by the contact of the strip steel and the reverse bending roller is more than 20 degrees;
and c, keeping the wrap angle formed by the contact of the strip steel and the reverse bending roller unchanged in the uncoiling process.
Further, the method further comprises:
step 1.1, obtaining the plastic deformation thickness and the elastic deformation thickness of the strip steel;
step 1.2, determining the plastic deformation rate of the strip steel according to the plastic deformation thickness and the elastic deformation thickness of the strip steel;
and step 1.3, determining the radius of the reverse bending roller through the plastic deformation rate.
Further, the method further comprises the steps of obtaining the thickness, the elastic modulus and the yield strength of the strip steel, and determining the elastic bending radius of the strip steel according to the thickness, the elastic modulus and the yield strength of the strip steel;
the thickness of the strip steel is obtained through measurement, and the elastic modulus and the yield strength of the strip steel are obtained through a tensile test.
Further, the method further comprises: gradually adjusting the pressing position of the reverse bending roller until the wrap angle of the strip steel generated on the reverse bending roller is more than 20 degrees, and then keeping the wrap angle stable and unchanged so as to convert the irregular original internal stress of the strip steel into the internal stress in a regular double-fold line distribution form.
Further, the method also comprises the steps of applying subsequent bending to the strip steel, setting the maximum bending curvature of the straightening machine to be less than or equal to the bending curvature of the reverse bending roller, and setting the pressing amount of the straightening machine to gradually reduce from the inlet to the outlet so as to enable the internal stress to form curvature gradient and be gradually homogenized after the strip steel is bent.
As a second aspect of the present invention, there is provided a device for improving the internal stress distribution of a steel strip, comprising an uncoiler and a turning roll, and further comprising a reverse bending roll and a straightener obtained by any one of the above methods for improving the internal stress distribution of a steel strip, wherein the reverse bending roll is disposed at the uncoiling position of the steel strip of the uncoiler, the straightener is disposed behind the turning roll, the steel strip of the uncoiler is reversely bent by the reverse bending roll and then reaches the turning roll, is turned by the turning roll and then reaches the straightener, and outputs the steel strip with uniform internal stress distribution after multiple times of forward and reverse bending by the straightener.
The invention has the following beneficial effects:
the reverse bending roll is arranged on the uncoiler of the unit, the reverse bending roll is always contacted with the strip steel to form a wrap angle in the strip steel uncoiling process and keeps a stable wrap angle, so that the strip steel in the wrap angle area of the reverse bending roll forms a stable and uniform plastic deformation area, the original irregular internal stress is converted into uniform double-fold line distribution, and further under the subsequent action of the straightening machine, the double-fold line internal stress distribution is further reduced and homogenized, the effect of improving the internal stress distribution of the strip steel is achieved, and a plurality of quality defects caused by the release of the internal stress can not be generated in the subsequent processing.
Drawings
FIG. 1 is a flowchart of a method for improving stress distribution in a strip steel according to an embodiment of the present invention;
fig. 2 is a structural diagram of an apparatus for improving stress distribution in a strip steel according to an embodiment of the present invention.
FIG. 3 is a schematic diagram of stress distribution in a double fold line provided by an embodiment of the present invention;
fig. 4 is a schematic view of a multi-fold internal stress distribution provided in an embodiment of the present invention.
Description of reference numerals: 1. an uncoiler, 2, a reverse bending roller, 3, strip steel, 4, a turning roller, 5 and a straightener.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As a first aspect of the present invention, as shown in fig. 1, there is provided a method for improving stress distribution in a steel strip, the method comprising the steps of:
step 1, arranging a reverse bending roller 2 with a preset roller diameter at a strip steel uncoiling position of a unit uncoiler 1, and forming reverse bending on a strip steel 3 at the uncoiling position through the reverse bending roller 2;
and 4, uncoiling the cold-rolled or hot-rolled strip steel coil.
The invention arranges the reverse bending roll 2 on the uncoiler 1 of the unit, the reverse bending roll 2 is always contacted with the strip steel 3 to form a wrap angle in the strip steel uncoiling process, and the wrap angle is kept stable, so that the strip steel 3 in the wrap angle area of the reverse bending roll 2 forms a stable and uniform plastic deformation area, the original irregular internal stress of the strip steel 3 is converted into uniform double-fold line distribution, and further under the subsequent action of the straightener 5, the double-fold line internal stress distribution is converted into the internal stress distributed by multiple fold lines, the internal stress peak value is gradually reduced, the internal stress is gradually homogenized, the effect of improving the internal stress distribution of the strip steel 3 is achieved, and a plurality of quality defects generated by the internal stress release can not be generated in the subsequent processing.
Preferably, in order to sufficiently reverse-bend the strip 3 at the reverse bending rolls 2 and ensure the consistency of the internal stress of the strip 3 in the longitudinal direction, the following conditions are satisfied:
a, the ratio of the radius of the reverse bending roller 2 to the elastic bending radius of the strip steel 3 is less than or equal to 5;
b, the wrap angle formed by the contact of the strip steel 3 and the reverse bending roller 2 is more than 20 degrees;
and c, keeping the wrap angle formed by the contact of the strip steel 3 and the reverse bending roller 2 unchanged in the uncoiling process.
Preferably, the method further comprises:
step 1.1, obtaining the plastic deformation thickness and the elastic deformation thickness of the strip steel 3;
step 1.2, determining the plastic deformation rate of the strip steel 3 according to the plastic deformation thickness and the elastic deformation thickness of the strip steel 3;
and step 1.3, determining the radius of the reverse bending roller 2 through the plastic deformation rate.
Preferably, the method further comprises: obtaining the thickness, the elastic modulus and the yield strength of the strip steel 3, and determining the elastic bending radius of the strip steel 3 according to the thickness, the elastic modulus and the yield strength of the strip steel 3;
the thickness of the strip steel 3 is obtained through measurement, and the elastic modulus and the yield strength of the strip steel 3 are obtained through a tensile test.
Preferably, the method further comprises: gradually adjusting the pressing position of the reverse bending roller 2 until the wrap angle generated by the strip steel 3 on the reverse bending roller 2 is more than 20 degrees, and then keeping the wrap angle stable and unchanged so as to convert the irregular original internal stress of the strip steel 3 into the internal stress in a regular double-fold line distribution form.
Preferably, the method further comprises the steps of applying subsequent bending to the strip steel 3 through a straightening machine, setting the maximum bending curvature of the straightening machine 5 to be less than or equal to the bending curvature of the reverse bending roller 2, and setting the reduction amount of the straightening machine 5 to be gradually reduced from the inlet to the outlet so as to enable the internal stress to form a curvature gradient and be gradually homogenized after the strip steel 3 is bent.
As a second aspect of the present invention, there is provided a device for improving the internal stress distribution of a strip steel, comprising an uncoiler 1 and a turning roll 4, and further comprising a reverse bending roll 2 and a straightener 5 obtained by any one of the above methods for improving the internal stress distribution of a strip steel, wherein the reverse bending roll 2 is disposed at the strip steel uncoiling position of the uncoiler 1, the straightener 5 is disposed behind the turning roll 4, the strip steel 3 of the uncoiler 1 is reversely bent by the reverse bending roll 2 and then reaches the turning roll 4, and is turned by the turning roll 4 and then reaches the straightener 5, and the strip steel 3 with uniform internal stress distribution is output after being subjected to multiple times of forward and reverse bending by the straightener 5.
According to the invention, the reverse bending roll 2 is arranged on the uncoiler 1 of the unit, the reverse bending roll 2 is always contacted with the strip steel 3 to form a wrap angle in the uncoiling process of the strip steel 3, and the wrap angle is kept stable, so that the strip steel 3 in the wrap angle area of the reverse bending roll 2 forms a stable and uniform plastic deformation area, the original irregular internal stress of the strip steel 3 is converted into uniform double-fold line distribution, and further under the subsequent action of the straightener 5, the double-fold line internal stress distribution is converted into the internal stress distributed by multiple fold lines, the internal stress peak value is gradually reduced, the internal stress is gradually homogenized, the effect of improving the internal stress distribution of the strip steel 3 is achieved, and a plurality of quality defects caused by the release of the internal stress can not be generated in the subsequent processing.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. A method for improving the stress distribution in a strip steel is characterized by comprising the following steps:
step 1, arranging a reverse bending roller with a preset roller diameter at a strip steel uncoiling position of an uncoiler of a unit, and forming reverse bending on the strip steel at the uncoiling position through the reverse bending roller;
step 2, adjusting the position of the reverse bending roller to enable the strip steel to generate a preset wrap angle on the reverse bending roller, and fully reversely bending the strip steel by utilizing the roller diameter of the reverse bending roller to enable irregular original internal stress of the strip steel to be converted into internal stress in a regular double-fold line distribution form;
step 3, arranging a straightening machine behind the steering roller, and utilizing the straightening machine to enable the strip steel to be bent forwards and backwards for multiple times, so that the internal stress distributed by double-fold lines is converted into the internal stress distributed by multiple-fold lines, and the uniform internal stress distribution is subjected to homogenization treatment;
step 4, uncoiling the cold-rolled or hot-rolled strip steel coil;
wherein, in order to make the belted steel fully reverse bending and guarantee length direction belted steel internal stress uniformity in reverse bending roll department, need to satisfy simultaneously:
a, the ratio of the radius of the reverse bending roller to the elastic bending radius of the strip steel is less than or equal to 5;
b, the wrap angle formed by the contact of the strip steel and the reverse bending roller is more than 20 degrees;
c, keeping a wrap angle formed by the contact of the strip steel and the reverse bending roller unchanged in the uncoiling process;
wherein the method further comprises:
step 1.1, obtaining the plastic deformation thickness and the elastic deformation thickness of the strip steel;
step 1.2, determining the plastic deformation rate of the strip steel according to the plastic deformation thickness and the elastic deformation thickness of the strip steel;
and step 1.3, determining the radius of the reverse bending roller through the plastic deformation rate.
2. The method for improving stress distribution in a steel strip as claimed in claim 1, further comprising obtaining the thickness, the elastic modulus, and the yield strength of the steel strip, and determining the elastic bend radius of the steel strip from the thickness, the elastic modulus, and the yield strength of the steel strip.
3. The method of improving stress distribution within a steel strip as claimed in claim 1, further comprising: gradually adjusting the pressing position of the reverse bending roller until the wrap angle of the strip steel generated on the reverse bending roller is more than 20 degrees, and then keeping the wrap angle stable and unchanged so as to convert the irregular original internal stress of the strip steel into the internal stress in a regular double-fold line distribution form.
4. The method for improving the stress distribution in the steel strip as claimed in claim 1, further comprising applying a subsequent bending to the steel strip, setting the maximum bending curvature of the straightener to be equal to or less than the bending curvature of the reverse bending rolls, and setting the reduction of the straightener to be gradually reduced from the inlet to the outlet so that the internal stress after the steel strip is bent forms a curvature gradient and is gradually homogenized.
5. A device for improving the distribution of the internal stress of the strip steel comprises an uncoiler and a steering roller, and is characterized by comprising a reverse bending roller and a straightening machine, wherein the reverse bending roller and the straightening machine are obtained by the method for improving the distribution of the internal stress of the strip steel according to any one of claims 1 to 4, the reverse bending roller is arranged at the strip steel uncoiling position of the uncoiler, the straightening machine is arranged behind the steering roller, the strip steel of the uncoiler reaches the steering roller after being reversely bent by the reverse bending roller, reaches the straightening machine after being turned by the steering roller, and outputs the strip steel with uniform distribution of the internal stress after being repeatedly positively and reversely bent by the straightening machine.
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| CN201911410946.4A CN111254265B (en) | 2019-12-31 | 2019-12-31 | Method and device for improving internal stress distribution of strip steel |
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| CN201911410946.4A CN111254265B (en) | 2019-12-31 | 2019-12-31 | Method and device for improving internal stress distribution of strip steel |
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| CN111254265B true CN111254265B (en) | 2021-11-05 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105268746A (en) * | 2015-11-11 | 2016-01-27 | 北京首钢股份有限公司 | Leveling method for cross break defects on surface of hot-rolled and acid-pickled plate |
| CN106077148A (en) * | 2016-06-27 | 2016-11-09 | 中冶赛迪工程技术股份有限公司 | A kind of strip steel back-flexing control method |
| CN107838199A (en) * | 2017-12-11 | 2018-03-27 | 中冶南方工程技术有限公司 | High strength band steel leveling rectifys technique |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008010062A1 (en) * | 2007-06-22 | 2008-12-24 | Sms Demag Ag | Process for hot rolling and heat treatment of a strip of steel |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105268746A (en) * | 2015-11-11 | 2016-01-27 | 北京首钢股份有限公司 | Leveling method for cross break defects on surface of hot-rolled and acid-pickled plate |
| CN106077148A (en) * | 2016-06-27 | 2016-11-09 | 中冶赛迪工程技术股份有限公司 | A kind of strip steel back-flexing control method |
| CN107838199A (en) * | 2017-12-11 | 2018-03-27 | 中冶南方工程技术有限公司 | High strength band steel leveling rectifys technique |
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