CN111451299B - Production method for reducing foreign matter press-in on surface of hot-rolled plate - Google Patents
Production method for reducing foreign matter press-in on surface of hot-rolled plate Download PDFInfo
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- CN111451299B CN111451299B CN202010241412.XA CN202010241412A CN111451299B CN 111451299 B CN111451299 B CN 111451299B CN 202010241412 A CN202010241412 A CN 202010241412A CN 111451299 B CN111451299 B CN 111451299B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/14—Guiding, positioning or aligning work
- B21B39/16—Guiding, positioning or aligning work immediately before entering or after leaving the pass
Abstract
A production method for reducing foreign matter indentation on the surface of a hot-rolled plate comprises the following steps: a lining plate at a bell mouth at the guide inlet end of an F2-FN frame is transformed into a double-side guide wheel structure, and FN is a middle frame; measuring the distance from the memorial archway to the upper edge of the guide along the outer vertical surface at the guide wheel, converting the distance into the opening degree of the guide ruler, and then calibrating, wherein the opening degree D of the single-side guide ruler is calculated by using a formula D which is S-L + H; s-the distance between the memorial archway and the center line of the guide ruler; l-the distance from the memorial archway to the vertical surface of the upper edge of the guide; h-the distance from the vertical surface of the upper edge of the guide to the roller surface of the guide wheel; optimizing the opening allowance of the guide ruler: the allowance of the F2-FN guide ruler is controlled to be 10-30mm, and the allowance of the F (N +1) -FM guide ruler is controlled to be 35-60 mm; FM is the last frame; the central line of the rough rolling vertical roll is controlled to be 5-25mm on the transmission side. The invention has the beneficial effects that: after the measure is adopted, the defect of foreign matter indentation on the surface of the hot rolled steel plate is thoroughly solved.
Description
Technical Field
The invention relates to the field of steel rolling processes, in particular to a production method for reducing foreign matter pressing-in on the surface of a hot-rolled plate.
Background
The foreign matter indentation on the surface of the hot rolled steel plate is a hot rolling defect universally existing in a hot rolling process, the foreign matter indentation is mainly generated within a range of 200mm from the edge of a strip steel, the position where the foreign matter indentation defect is generated on the surface of the hot rolled plate is subjected to macro morphology, microstructure analysis and component analysis, the reason and the process of the defect generation are searched, and the reason of the foreign matter indentation generation is further determined by combining with the on-site production process and equipment state examination.
Foreign matter indentation defects have a great influence on varieties used for cold rolling, and particularly, foreign matter indentation defects of mild steel, such as silicon steel, ultra-low carbon steel, and the like, are more serious. Foreign body penetration has a major impact on the consequences: 1) the belt breakage accident of hot rolling production is easily caused, and the continuous production of hot rolling is influenced; 2) the product quality and yield of the hot rolled plate are reduced; 3) the workload of the coil splitting procedure is increased, and the normal delivery is influenced; 4) the foreign matter indentation defect recognition error rate is large, and the hot rolling process has no closed defect, thereby causing the strip breakage accident of the cold rolling production and influencing the normal production of the cold rolling; 5) the abrasion loss of the roller is increased, and the processing cost is greatly increased. The foreign matter is pressed in to cause the product quality and the yield to be reduced, great influence is brought to the smooth operation of production and the good execution of product contract, and the problem is necessary to be solved.
Disclosure of Invention
The invention aims to provide a production method for reducing the pressing-in of foreign matters on the surface of a hot-rolled plate, so that the strip breakage in hot rolling and cold rolling production caused by the pressing-in of the foreign matters is avoided, and the smooth production is ensured.
In order to achieve the purpose, the invention adopts the following technical scheme:
a production method for reducing foreign matter indentation on the surface of a hot-rolled plate comprises the following steps:
1) the improvement of the lining plate of the inlet guide structure: a lining plate at the bell mouth at the guide inlet end of an F2-FN rolling mill is reformed into a double guide wheel structure, FN is an intermediate frame rolling mill;
2) the guide ruler guide wheel calibration method is improved as follows: measuring the distance from the memorial archway to the guide and the upper edge of the outer vertical surface at the guide wheel, converting the distance into the opening degree of the guide ruler, and then calibrating, wherein the opening degree D of the single-side guide ruler is calculated by a formula (1):
D＝S-L+H (1)；
in the formula: s-the distance between the memorial archway and the center line of the guide ruler is mm;
l-the distance between the memorial archway and the vertical surface of the upper edge of the guide and the outer side is mm;
h-the distance from the vertical surface of the upper edge of the guide to the roller surface of the guide wheel is mm;
3) optimizing the opening allowance of the guide ruler: the allowance of the F2-FN guide ruler is controlled to be 10-30mm, and the allowance of the F (N +1) -FM guide ruler is controlled to be 35-60 mm; FM is a final stand rolling mill;
4) establishing position centering balance of a rough rolling vertical roller and a finish rolling guide ruler: the center line of the rough rolling vertical roll is controlled to be 5-25mm on the transmission side, and the finish rolling vertical roll and the finish rolling guide ruler are calibrated in a centering way according to the center line of the housing.
Compared with the prior art, the invention has the beneficial effects that:
1) after the measure is adopted, the defect of foreign matter indentation on the surface of the hot rolled steel plate is thoroughly solved.
2) After the measure is adopted, the rework amount of the hot rolled steel coil is greatly reduced, and the primary qualification rate, the yield of the original species and the execution rate of the contract are greatly improved.
Drawings
FIG. 1 is a schematic diagram of an F2-FN frame guide before modification;
FIG. 2 is a schematic diagram of an F2-FN frame guide after modification;
in the figure: 1-vertical surface of upper edge of guide, 2-double guide wheels, and 3-memorial archway.
Detailed Description
The following further illustrates embodiments of the invention:
referring to fig. 2, a production method for reducing the foreign matter indentation on the surface of a hot-rolled plate comprises the following steps:
1) the improvement of the lining plate of the inlet guide structure: the hot rolling finishing mill entry is led and is defended the device, mainly comprises leading and defending frame and welt, wherein welt and belted steel limit portion contact, produce the foreign matter defect of impressing, lead and defend the welt structure to the finish rolling entry and reform transform: the lining plate at the bell mouth of the guide inlet end of the F2-FN rolling mill is reformed into a double guide wheel 2 structure, FN is an intermediate frame rolling mill, strip steel is in contact with the double guide wheels 2, the original sliding friction is changed into rolling friction, the occurrence of foreign matter pressing-in defects is greatly reduced, and the double guide wheels 2 can play a role in strip steel centering;
2) the guide ruler guide wheel calibration method is improved as follows: the method for normally calibrating the guide ruler comprises the steps of measuring the distance from the guide rulers on two sides to the memorial archway by utilizing the center line of the memorial archway in a rolling mill frame to calibrate, wherein the method is not suitable for a guide wheel structure, improving the calibration method of the guide ruler guide wheel, measuring the distance from the memorial archway 3 to the upper edge of the guide guard along the outer vertical surface 1 at the position of the double guide wheels 2, and calibrating after converting the distance into the opening degree of the guide ruler, wherein the method is simple, safe and easy to operate, has high calibration precision and is beneficial to reducing the defect of foreign matter pressing in, and the opening degree D (the working side or the transmission side) of the single-side guide ruler is calculated by using a formula (1):
D＝S-L+H (1)；
in the formula: s-the distance between the memorial archway and the center line of the guide ruler is mm;
l-the distance between the memorial archway and the vertical surface of the upper edge of the guide and the outer side is mm;
h-the distance from the vertical surface of the upper edge of the guide to the roller surface of the guide wheel is mm;
3) optimizing the opening allowance of the guide ruler: optimizing the opening allowance of each frame guide ruler in finish rolling, reducing the opening allowance of the finish rolling F2-FN frame guide ruler, improving the alignment degree, releasing the opening allowance of the finish rolling F (N +1) -FM rolling mill guide ruler, and reducing the foreign matter pressing defect; finishing the F2-FM guide ruler with allowance in a horn mouth mode with the size increased in a step manner, controlling the F2-FN guide ruler with allowance in a range of 10-30mm, and controlling the F (N +1) -FM guide ruler with allowance in a range of 35-60 mm; FM is a final stand rolling mill;
4) establishing position centering balance of a rough rolling vertical roller and a finish rolling guide ruler: the central line positions of the rough rolling vertical roll and the finish rolling vertical roll are determined, the position of a finish rolling inlet is fixed, the position balance of the strip steel in the three-in-one mode of the rough rolling vertical roll, the finish rolling vertical roll and the finish rolling guide ruler is formed through the relative position of the guide ruler in the finish rolling rack, the centering capacity of the strip steel is improved, and the foreign matter indentation defect amount is reduced. The center line of the rough rolling vertical roll is controlled to be 5-25mm on the transmission side, and the finish rolling vertical roll and the finish rolling guide ruler are calibrated in a centering way according to the center line of the housing.
Generally, the number of rolling mills is more than or equal to 5 and less than or equal to 8, and when M is 5, the intermediate frame rolling mill FN is a 3 rd frame rolling mill (N is 3); when M is 6 or 7, the intermediate frame rolling mill FN is the 4 th frame rolling mill (N is 4); when M is 8, the intermediate frame rolling mill FN is the 5 th frame rolling mill (N is 5).
Example (b):
the quantity of the rolling mills of the embodiment is 7, the distance S from the housing 3 to the center line of the guide ruler is 980mm, and the distance from the guide upper edge of the outer side vertical surface 1 to the roller surface of the guide wheel is as follows: 215 mm.
A production method for reducing foreign matter indentation on the surface of a hot-rolled plate comprises the following steps:
1) the improvement of the lining plate of the inlet guide structure: a lining plate at a bell mouth at the guide inlet end of the F2-F4 frame is transformed into a double guide wheel 2 structure;
2) and (3) measuring the distance between the guide upper edge outer vertical surface 1 and the housing 3 at the entrance of the rack, establishing a conversion corresponding table of the opening degree of the guide ruler, and calibrating by converting numerical values.
3) Optimizing the opening allowance of the guide ruler: the margin of a guide ruler F2-F4 is controlled to be 15-25mm, and the margin of a guide ruler F5-F7 is controlled to be 40-50 mm;
4) establishing position centering balance of a rough rolling vertical roller and a finish rolling guide ruler: the center line of the rough rolling vertical roll is controlled to be 10-20mm on the transmission side, and the finish rolling vertical roll and the finish rolling guide ruler are calibrated in a centering way according to the center line of the housing.
Claims (1)
1. A production method for reducing foreign matter indentation on the surface of a hot-rolled plate is characterized by comprising the following steps:
1) the improvement of the lining plate of the inlet guide structure: a lining plate at the bell mouth at the guide inlet end of an F2-FN rolling mill is reformed into a double guide wheel structure, FN is an intermediate frame rolling mill;
2) the guide ruler guide wheel calibration method is improved as follows: measuring the distance from the memorial archway to the guide and the upper edge of the outer vertical surface at the guide wheel, converting the distance into the opening degree of the guide ruler, and then calibrating, wherein the opening degree D of the single-side guide ruler is calculated by a formula (1):
D＝S-L+H (1)；
in the formula: s-the distance between the memorial archway and the center line of the guide ruler is mm;
l-the distance between the memorial archway and the vertical surface of the upper edge of the guide and the outer side is mm;
h-the distance from the vertical surface of the upper edge of the guide to the roller surface of the guide wheel is mm;
3) optimizing the opening allowance of the guide ruler: the number of the rolling mills is 7, the allowance of a guide ruler F2-F4 is controlled to be 15-25mm, and the allowance of a guide ruler F5-F7 is controlled to be 40-50 mm;
4) establishing position centering balance of a rough rolling vertical roller and a finish rolling guide ruler: the center line of the rough rolling vertical roll is controlled to be 5-25mm on the transmission side, and the finish rolling vertical roll and the finish rolling guide ruler are calibrated in a centering way according to the center line of the housing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010241412.XA CN111451299B (en) | 2020-03-31 | 2020-03-31 | Production method for reducing foreign matter press-in on surface of hot-rolled plate |
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| CN202010241412.XA CN111451299B (en) | 2020-03-31 | 2020-03-31 | Production method for reducing foreign matter press-in on surface of hot-rolled plate |
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| CN111451299A CN111451299A (en) | 2020-07-28 |
| CN111451299B true CN111451299B (en) | 2022-02-18 |
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| CN113042547B (en) * | 2021-03-05 | 2023-05-12 | 首钢京唐钢铁联合有限责任公司 | Strip steel guiding method and side guide plate |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201183064Y (en) * | 2008-01-08 | 2009-01-21 | 鞍钢股份有限公司 | Strip steel edge crack preventing apparatus of hot continuous rolling unit |
| CN203356221U (en) * | 2013-06-08 | 2013-12-25 | 新疆八一钢铁股份有限公司 | Improved precision rolling side guide board |
| CN205949491U (en) * | 2016-08-24 | 2017-02-15 | 安徽马钢重型机械制造有限公司 | Roll formula hot rolled plate hoop mill entry guide fittings |
| CN106734234A (en) * | 2016-12-13 | 2017-05-31 | 山东钢铁股份有限公司 | A kind of control method of the preceding jig surplus of hot-strip finishing mill |
| CN109365549A (en) * | 2018-10-09 | 2019-02-22 | 鞍钢股份有限公司 | A kind of scaling method of finish rolling entrance guide wheel |
| CN110586657A (en) * | 2019-09-04 | 2019-12-20 | 鞍钢股份有限公司 | Production method for reducing crack defects of hot-rolled edge of non-oriented silicon steel |
-
2020
- 2020-03-31 CN CN202010241412.XA patent/CN111451299B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201183064Y (en) * | 2008-01-08 | 2009-01-21 | 鞍钢股份有限公司 | Strip steel edge crack preventing apparatus of hot continuous rolling unit |
| CN203356221U (en) * | 2013-06-08 | 2013-12-25 | 新疆八一钢铁股份有限公司 | Improved precision rolling side guide board |
| CN205949491U (en) * | 2016-08-24 | 2017-02-15 | 安徽马钢重型机械制造有限公司 | Roll formula hot rolled plate hoop mill entry guide fittings |
| CN106734234A (en) * | 2016-12-13 | 2017-05-31 | 山东钢铁股份有限公司 | A kind of control method of the preceding jig surplus of hot-strip finishing mill |
| CN109365549A (en) * | 2018-10-09 | 2019-02-22 | 鞍钢股份有限公司 | A kind of scaling method of finish rolling entrance guide wheel |
| CN110586657A (en) * | 2019-09-04 | 2019-12-20 | 鞍钢股份有限公司 | Production method for reducing crack defects of hot-rolled edge of non-oriented silicon steel |
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