CN114653760A - Edge extension control method for cold-rolled strip steel plate shape - Google Patents
Edge extension control method for cold-rolled strip steel plate shape Download PDFInfo
- Publication number
- CN114653760A CN114653760A CN202210218059.2A CN202210218059A CN114653760A CN 114653760 A CN114653760 A CN 114653760A CN 202210218059 A CN202210218059 A CN 202210218059A CN 114653760 A CN114653760 A CN 114653760A
- Authority
- CN
- China
- Prior art keywords
- width
- strip steel
- edge
- strip
- undetected
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 113
- 239000010959 steel Substances 0.000 title claims abstract description 113
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000001514 detection method Methods 0.000 claims abstract description 34
- 238000005097 cold rolling Methods 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 239000002436 steel type Substances 0.000 claims abstract description 8
- 238000004364 calculation method Methods 0.000 claims description 10
- 239000010960 cold rolled steel Substances 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 description 10
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005034 decoration Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013499 data model Methods 0.000 description 1
- 238000003708 edge detection Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
Images
Classifications
-
- 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
Abstract
The invention relates to a method for controlling the edge extension of the shape of a cold-rolled strip steel plate, which comprises the following steps: step 1, calculating the undetected width of the edge part of a plurality of strip steels of the same steel type and different widths on the same plate-shaped roller; step 2, cold rolling is respectively carried out on each strip steel in the step 1 to obtain the optimal edge extension value of each strip steel; step 3, establishing a relational expression between the optimal edge extension value and the undetected edge width of the strip steel; step 4, calculating the undetected width of the edge of the strip steel with the width of x0, which is the same as the steel grade in the step 1, by adopting the same method in the step 1; and 5, substituting the undetected width of the edge of the strip steel in the step 4 into a relational expression to obtain the optimal edge extension value corresponding to the strip steel with the width of x 0. The method solves the blind area of strip edge shape control caused by the detection limitation of the equipment in the cold rolling production process, and effectively reduces the accidents of strip breakage, disqualification and the like caused by improper shape control in the actual production.
Description
Technical Field
The invention relates to the technical field of cold rolling, in particular to a method for controlling the edge extension of the shape of a cold-rolled strip steel plate.
Background
When the strip steel is subjected to cold rolling, in order to obtain good strip shape, strip steel shape detection equipment is generally arranged, and the most commonly used detection equipment is that a high-sensitivity pressure sensor is arranged inside a strip roller, the pressure sensor is generally distributed along the axial direction of the roller body of the strip roller, when the strip steel passes through the strip roller, pressure is generated on the roller surface, the pressure is detected by the pressure sensor on the strip roller, and after a series of conversion treatments, a strip shape graph at the position of the strip steel is obtained.
During rolling, a roll body of a certain plate-shaped roll is divided into a plurality of detection areas (each detection area is provided with 4 high-sensitivity pressure sensors, the pressure value is detected every time the roll body rotates by 90 degrees), strip steel is pressed on each detection area during rolling (note that the sensors on the detection areas can normally work only when the strip steel completely covers the detection areas), and strip steel pressures detected by the detection areas on the plate-shaped roll are converted and combined together to form a strip steel width direction plate diagram.
At present, a target curve of a plate shape in a plate shape system in actual production is only related to the type and the thickness of strip steel, when strip steel with a conventional width is rolled, the plate shape is controlled according to a designed target curve of the plate shape, the measured plate shape of the edge of the strip steel is high in correspondence with the actual plate shape, but when the strip steel with the conventional width is produced, the area where the edge of the strip steel is located cannot be completely covered on a detection area, so that the area where the edge of the strip steel is located cannot be normally detected, the difference of different degrees between the actual plate shape and the measured plate shape can be caused, and the situation that the edge is too small in extension or too large in extension to cause unqualified product quality or even strip steel is broken can be caused. The optimal edge extension value can be obtained only by continuous trial and error during rolling, but the method is time-consuming and labor-consuming and wastes a large amount of strip steel. Further improvements are therefore desirable.
Disclosure of Invention
The invention aims to solve the technical problem of providing an edge extension control method for solving the problem of improper plate shape control caused by a strip steel edge detection blind area and having high efficiency in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for controlling the edge extension of the cold-rolled strip steel plate shape is characterized by comprising the following steps: the method comprises the following steps:
step 3, establishing a relational expression between the optimal edge extension value and the edge undetected width of the strip steel according to the edge undetected width of each strip steel and the corresponding optimal edge extension value;
step 4, calculating the undetected width of the edge of the strip steel with the width of x0, which is the same as the steel grade in the step 1, by adopting the same method in the step 1; x0 is a preset value;
and 5, substituting the undetected width of the edge of the strip steel in the step 4 into the relational expression in the step 3 to obtain the optimal edge extension value corresponding to the strip steel with the width of x 0.
As an improvement, the method for calculating the undetected width of the edge of the strip steel in the step 1 comprises the following steps:
dividing the roller body of the plate-shaped roller into N detection areas with equal distance, wherein the width of each detection area is x;
aligning the width midpoint position of each strip steel with the midpoint position of the plate-shaped roller;
when N is an odd number, the calculation formula of the number M of the detection areas on the cover plate-shaped roller of the strip steel with the width of W1 at any side area of the midpoint position is as follows: m ═ W1-x)/2/x;
when N is even number, the calculation formula of the number M of detection areas of the covering plate-shaped roller in any side area of the midpoint position on the strip steel with the width of W1 is as follows: m is W1/2/x;
then: the undetected width W of any side part of the strip steel with the width W1 is as follows: w ═ M ═ x;
where [ M ] is the integer function of M.
In order to increase the rate of obtaining the optimal edge extension value, it is preferable that the strip steel in step 1 is selected to have a width commonly used in the actual production, that is, the optimal edge extension value of each strip steel in step 2 is an empirical value in the actual cold rolling process.
Preferably, in the step 3, a relation between the optimal edge extension value and the undetected width of the edge of the strip is established through a mathematical fitting method.
Compared with the prior art, the invention has the advantages that: by establishing a relational expression between the optimal edge extension value and the undetected width of the edge of the strip steel, the mathematical model is adopted to calculate the edge extension setting data with different widths for the strip steel to carry out the strip shape control during cold rolling. Therefore, the method solves the dead zone of strip edge shape control caused by the detection limitation of the equipment in the cold rolling production process, optimizes the strip shape control method of strips with different widths, and effectively reduces the accidents of strip breakage, disqualification and the like caused by improper strip shape control in actual production.
Drawings
FIG. 1 is a flowchart of a method for controlling edge elongation of a cold rolled steel strip in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram showing the undetected width of the edge of the strip steel on the same plate-shaped roll in the embodiment of the present invention (the number of detection areas on the plate-shaped roll is odd);
FIG. 3 is a schematic diagram showing the undetected edge widths of the strip on the same plate roll in the embodiment of the present invention (the detected regions on the plate roll are even numbers).
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1, the method for controlling the edge elongation of the cold-rolled steel strip shape in the present embodiment includes the steps of:
the method for calculating the undetected width of the edge of the strip steel comprises the following steps:
dividing the roll body of the plate-shaped roll into N detection areas with equal distance, wherein the width of each detection area is x;
aligning the width midpoint position of each strip steel with the midpoint position of the plate-shaped roller;
when N is an odd number, the calculation formula of the number M of the detection areas on the cover plate-shaped roller of the strip steel with the width of W1 at any side area of the midpoint position is as follows: m ═ W1-x)/2/x;
as shown in fig. 3, when N is an even number, the number M of detection areas of the cover plate rolls in any one side area of the strip having a width of W1 at the midpoint is calculated by the following formula: m is W1/2/x;
then: the undetected width W of any side part of the strip steel with the width W1 is as follows: w ═ (M) x;
wherein [ M ] is a rounding function of M;
as shown in fig. 2, the roll body of the plate-shaped roll 1 is divided into 5 detection areas 11 at equal intervals, the strip steel 2 respectively comprises a first strip steel 21 positioned on the left side of the central dotted line and a second strip steel 22 positioned on the right side of the central dotted line, and the detection areas on the plate-shaped roll are covered on the first strip steel 21 and the second strip steel 22 as shown in fig. 2;
as shown in fig. 3, the roll body of the plate-shaped roll 1 is divided into 6 detection areas 11 at equal intervals, the strip steel 2 comprises a first strip steel 21 positioned on the left side of the dotted line of the center and a second strip steel 22 positioned on the right side of the dotted line of the center, and the detection areas on the plate-shaped roll are covered on the first strip steel 21 and the second strip steel 22 as shown in fig. 3;
because the target curve of the plate shape in the plate shape system in the actual production is only related to the steel type and the thickness of the strip steel, when the strip steel with the conventional width is rolled, the plate shape is controlled according to the designed target curve of the plate shape, the measured plate shape of the edge of the strip steel has higher correspondence with the actual plate shape, therefore, the strip steel in the step 1 selects the width commonly used in the actual production, and the optimal edge extension value of each strip steel in the step 2 adopts the empirical value in the actual cold rolling process, thereby ensuring that the optimal edge extension value is determined at the fastest speed and improving the accuracy of the optimal edge extension value;
wherein the optimal edge extension value is a plate shape target value when the error between the reference set plate shape target value and the actual plate shape graph in rolling is within a preset range (the actual plate shape histogram contour is matched with a preset plate shape curve in an ideal state);
step 3, establishing a relational expression between the optimal edge extension value and the edge undetected width of the strip steel according to the edge undetected width of each strip steel and the corresponding optimal edge extension value;
establishing a relation between the optimal edge extension value and the undetected width of the edge of the strip steel by a mathematical fitting method; the mathematical fitting method can adopt a common fitting method; for example: linear, polynomial, or other fitting methods;
step 4, calculating the undetected width of the edge of the strip steel with the width of x0, which is the same as the steel grade in the step 1, by adopting the same method in the step 1; x0 is a preset value;
and 5, substituting the undetected width of the edge of the strip steel in the step 4 into the relational expression in the step 3 to obtain the optimal edge extension value corresponding to the strip steel with the width of x 0.
In the invention, the relation between the optimal edge extension value and the undetected width of the edge of the strip steel is firstly researched, and then the undetected width of the edge of the strip steel to be rolled is brought into the relation, so that the optimal edge extension value can be obtained. Therefore, the method obtains the edge extension value through the guidance of a mathematical modeling method, has good reference value, solves the dead zone of strip edge shape control caused by the detection limitation of equipment in the cold rolling production process, optimizes the strip shape control method of strips with different widths, and effectively reduces the accidents of strip breakage, disqualification and the like caused by improper strip shape control in the actual production.
Since the relationship between the edge extension value during cold rolling and the force applied during cold rolling is common knowledge in the industry, for example: 8I-unit is 16.8N/mm2, wherein I-unit is a plate unit; n/mm2 is the pressure unit, force per square millimeter; therefore, the magnitude of force applied during cold rolling is regulated and controlled through the obtained optimal edge extension value, so as to obtain the strip steel meeting the plate shape requirement.
The method of the present invention will be explained by using the following specific examples, in this example, the common material used in the actual cold rolling process is 304 steel, the strip steel with the width of 1092mm, 1248mm and 1194mm is used as the reference for establishing the data model, the roll body of the plate-shaped roll is divided into 27 detection areas with equal distance, and the width of each detection area is 52 mm;
the optimal edge extension value is an optimal value determined empirically in the actual finish rolling pass process, and an equation is established for the undetected edge width and the optimal edge extension value in the table 1, and the optimal edge extension value can be obtained by adopting a special fitting software fitting formula or a manual drawing fitting mode; in this embodiment, a drawing and fitting manner is described, where an edge undetected width is taken as an abscissa, and an optimal edge extension value is taken as an ordinate, points corresponding to the edge undetected width and the optimal edge extension value of each strip steel are drawn in a coordinate system, the three points are connected by straight lines, a two-stage linear relationship is approximately formed between the optimal edge extension value and the edge undetected width through analysis, and the calculation is performed according to a linear fitting calculation method to obtain:
wherein x corresponds to the undetected width of the edge; y corresponds to the optimum edge extension in units of I-units (which corresponds to the units of measure for the panel shape).
Experiment one, assuming that the material of the strip steel to be rolled is 304 steel types, the strip steel is rolled from 3.0mm to 0.6mm, the rolling pass of the strip steel is 8 passes, and the width of the strip steel is 1200 mm; the same plate-shaped rolls as in table 1 above were used;
the specific calculation method comprises the following steps:
detection zone coverage: (1200-52)/2/52 ═ 11.04 (pieces);
the edge undetected width was: (11.04-11) × 52 ═ 2 (mm);
optimum edge extension value:
experiment II, assuming that the material of the strip steel to be rolled is 304 steel types, the strip steel is rolled from 3.0mm to 1.0mm, the rolling pass of the strip steel is 5 passes, and the width of the strip steel is 1245 mm; the same plate-shaped rolls as in table 1 above were used;
the specific calculation method comprises the following steps:
detection zone coverage: (1245-52)/2/52 ═ 11.47 (pieces);
the edge undetected width was: (11.47-11) × 52 ═ 24.44 (mm);
optimum edge extension value:
thirdly, assuming that the material of the strip steel to be rolled is 304 steel types, the strip steel is rolled from 3.0mm to 0.9mm, the rolling pass of the strip steel is 6 passes, and the width of the strip steel is 1150 mm; the same plate-shaped rolls as in table 1 above were used;
the specific calculation method comprises the following steps:
detection zone coverage: (1150-52)/2/52-10.56 (pieces);
the edge undetected width was: (10.56-10) ≈ 52 ≈ 29 (mm);
optimum edge extension value:
according to the formula of 16.8N/mm2, the force applied to the edge part during the actual rolling can be obtained, and the obtained force is used during the rolling so as to obtain the plate shape meeting the product quality requirement.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (4)
1. A method for controlling the edge extension of the cold-rolled strip steel plate shape is characterized by comprising the following steps: the method comprises the following steps:
step 1, calculating the undetected width of the edge part of a plurality of strip steels of the same steel type and different widths on the same plate-shaped roller;
step 2, cold rolling is respectively carried out on each strip steel in the step 1 to obtain the optimal edge extension value of each strip steel;
step 3, establishing a relational expression between the optimal edge extension value and the edge undetected width of the strip steel according to the edge undetected width of each strip steel and the corresponding optimal edge extension value;
step 4, calculating the undetected width of the edge of the strip steel with the width of x0, which is the same as the steel grade in the step 1, by adopting the same method in the step 1; x0 is a preset value;
and 5, substituting the undetected width of the edge of the strip steel in the step 4 into the relational expression in the step 3 to obtain the optimal edge extension value corresponding to the strip steel with the width of x 0.
2. The method of controlling edge extension in a cold rolled steel strip shape according to claim 1, wherein: the method for calculating the undetected width of the edge of the strip steel in the step 1 comprises the following steps:
dividing the roller body of the plate-shaped roller into N detection areas with equal distance, wherein the width of each detection area is x;
aligning the width midpoint position of each strip steel with the midpoint position of the plate-shaped roller;
when N is an odd number, the calculation formula of the number M of the detection areas on the cover plate-shaped roller of the strip steel with the width of W1 at any side area of the midpoint position is as follows: m ═ W1-x)/2/x;
when N is even number, the calculation formula of the number M of detection areas of the covering plate-shaped roller in any side area of the midpoint position on the strip steel with the width of W1 is as follows: m is W1/2/x;
then: the undetected width W of any side part of the strip steel with the width W1 is as follows: w ═ M ═ x;
where [ M ] is the integer function of M.
3. The method of controlling edge extension in a cold rolled steel strip shape according to claim 1, wherein: the width of the strip steel in the step 1 is selected to be the width commonly used in the actual production, and the optimal edge extension value of each strip steel in the step 2 is the empirical value in the actual cold rolling process.
4. The method of controlling edge extension in a cold rolled steel strip shape according to claim 1, wherein: and 3, establishing a relation between the optimal edge extension value and the undetected width of the edge of the strip steel by a mathematical fitting method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210218059.2A CN114653760A (en) | 2022-03-08 | 2022-03-08 | Edge extension control method for cold-rolled strip steel plate shape |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210218059.2A CN114653760A (en) | 2022-03-08 | 2022-03-08 | Edge extension control method for cold-rolled strip steel plate shape |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114653760A true CN114653760A (en) | 2022-06-24 |
Family
ID=82029919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210218059.2A Pending CN114653760A (en) | 2022-03-08 | 2022-03-08 | Edge extension control method for cold-rolled strip steel plate shape |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114653760A (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1121447A (en) * | 1994-03-11 | 1996-05-01 | 川崎制铁株式会社 | Form control method in rolling mill |
| KR20040019732A (en) * | 2002-08-29 | 2004-03-06 | 재단법인 포항산업과학연구원 | Method for setting up the rolling load to acquire the constant elongation percentage in the skin pass mill, apparatus thereof |
| CN101618402A (en) * | 2008-06-30 | 2010-01-06 | 宝山钢铁股份有限公司 | Method for controlling planeness of cold-rolling strip steel |
| CN101920268A (en) * | 2009-06-09 | 2010-12-22 | 鞍钢股份有限公司 | Method for processing measured value for controlling shape of plates in cold-rolling mill |
| CN102513373A (en) * | 2011-12-29 | 2012-06-27 | 中冶南方（武汉）自动化有限公司 | Cold rolled plate shape residual eliminating method |
| CN102744265A (en) * | 2011-04-22 | 2012-10-24 | 宝山钢铁股份有限公司 | Strip steel C warping control method |
| CN102909223A (en) * | 2012-10-25 | 2013-02-06 | 河北省首钢迁安钢铁有限责任公司 | Edge shape control method |
| CN103567229A (en) * | 2013-10-24 | 2014-02-12 | 北京科技大学 | Roll bending force combination plate shape control method for six-roll rolling mill |
| CN103736747A (en) * | 2013-12-30 | 2014-04-23 | 中冶南方（武汉）自动化有限公司 | Sensing contact area percentage based strip steel edge flatness detection value compensation method |
| CN104001730A (en) * | 2013-02-22 | 2014-08-27 | 宝山钢铁股份有限公司 | Target board shape setting method |
| CN105363800A (en) * | 2014-08-29 | 2016-03-02 | 宝山钢铁股份有限公司 | Precise plate shape value obtaining method based on sectional shape |
-
2022
- 2022-03-08 CN CN202210218059.2A patent/CN114653760A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1121447A (en) * | 1994-03-11 | 1996-05-01 | 川崎制铁株式会社 | Form control method in rolling mill |
| KR20040019732A (en) * | 2002-08-29 | 2004-03-06 | 재단법인 포항산업과학연구원 | Method for setting up the rolling load to acquire the constant elongation percentage in the skin pass mill, apparatus thereof |
| CN101618402A (en) * | 2008-06-30 | 2010-01-06 | 宝山钢铁股份有限公司 | Method for controlling planeness of cold-rolling strip steel |
| CN101920268A (en) * | 2009-06-09 | 2010-12-22 | 鞍钢股份有限公司 | Method for processing measured value for controlling shape of plates in cold-rolling mill |
| CN102744265A (en) * | 2011-04-22 | 2012-10-24 | 宝山钢铁股份有限公司 | Strip steel C warping control method |
| CN102513373A (en) * | 2011-12-29 | 2012-06-27 | 中冶南方（武汉）自动化有限公司 | Cold rolled plate shape residual eliminating method |
| CN102909223A (en) * | 2012-10-25 | 2013-02-06 | 河北省首钢迁安钢铁有限责任公司 | Edge shape control method |
| CN104001730A (en) * | 2013-02-22 | 2014-08-27 | 宝山钢铁股份有限公司 | Target board shape setting method |
| CN103567229A (en) * | 2013-10-24 | 2014-02-12 | 北京科技大学 | Roll bending force combination plate shape control method for six-roll rolling mill |
| CN103736747A (en) * | 2013-12-30 | 2014-04-23 | 中冶南方（武汉）自动化有限公司 | Sensing contact area percentage based strip steel edge flatness detection value compensation method |
| CN105363800A (en) * | 2014-08-29 | 2016-03-02 | 宝山钢铁股份有限公司 | Precise plate shape value obtaining method based on sectional shape |
Non-Patent Citations (2)
| Title |
|---|
| 赵启林;王军生;王国栋;: "一种板形检测值处理方法的开发及应用", 材料与冶金学报, no. 04, pages 294 - 296 * |
| 韩征;: "自动板形控制技术在宝钢二次冷轧机组中的应用", 宝钢技术, no. 1, pages 64 - 67 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109226280B (en) | Method for controlling double-edge wave shape and medium-wave shape of five-stand cold continuous rolling high-strength steel plate strip | |
| CN111889512B (en) | Method for producing thin steel plate by single-stand rolling mill | |
| CN106475424A (en) | A kind of control method of Hot Rolling Strip sideslip | |
| EP1479457B1 (en) | Method of manufacturing seamless steel pipe | |
| AU632719B2 (en) | Method of controlling edge drop in cold rolling of steel | |
| CN101829687A (en) | Method for controlling roll gap of strip steel finishing mill to eliminate influence of specification change | |
| Khramshin et al. | Control methods and systems providing reduced consumption index at rolled product manufacture at plate mill | |
| CN107175260A (en) | Wedge-shaped base width control method based on fixed-width side press | |
| CN113664047B (en) | Production method for eliminating hot rolling local high points with wide and thick specifications of cold-rolled material | |
| EP0206453A1 (en) | Method of multi-pass rolling and rolling mill stand for carrying out the method | |
| CN114653760A (en) | Edge extension control method for cold-rolled strip steel plate shape | |
| CN105290116B (en) | Method for controlling transverse rolling width and longitudinal rolling width of moderately-thick plate | |
| CN109226278B (en) | Single-side corrugated plate shape control method for five-frame cold continuous rolling high-strength steel plate strip | |
| CN216655854U (en) | Unequal-width straightening roller set for high-strength H-shaped steel | |
| CN109513750A (en) | It is a kind of to take into account the crown feedback method that shape wave is adjusted between rack | |
| CN112916612A (en) | H-shaped steel flexible rolling rough rolling pass system and rolling method | |
| US4856313A (en) | Method of controlling strip crown in planetary rolling | |
| JP3211709B2 (en) | Manufacturing method of section steel | |
| JPH0753282B2 (en) | Channel steel manufacturing method | |
| AU681219B2 (en) | H-steel manufacturing method | |
| AU672927B2 (en) | Roll-forming cold worked sheet metal articles | |
| JP3211710B2 (en) | Manufacturing method of section steel | |
| JPH11267705A (en) | Manufacture of checkered plate and manufacturing device thereof | |
| JPH05237503A (en) | Method for hot rolling stainless shape steel | |
| JPH09174159A (en) | Production of steel shape |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |