CN101491812B - Hot continuous rolling medium-and-heavy plate production method and device without coiling micro-stress - Google Patents
Hot continuous rolling medium-and-heavy plate production method and device without coiling micro-stress Download PDFInfo
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- CN101491812B CN101491812B CN200910061029XA CN200910061029A CN101491812B CN 101491812 B CN101491812 B CN 101491812B CN 200910061029X A CN200910061029X A CN 200910061029XA CN 200910061029 A CN200910061029 A CN 200910061029A CN 101491812 B CN101491812 B CN 101491812B
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Abstract
The invention discloses a method and a device for producing coiling-free microstress hot continuously rolled medium plates. The method comprises the following steps: performing heating, rough rolling, precision rolling and cooling in turn on plate blanks in a hot rolled strip operating line; passing cooled steel plates after the rolling directly through a coiling machine and cutting the steel plates; transferring the steel plates onto a cooling bed for temperature reduction; powerfully straightening the steel plates; and finally, cutting the steel plates crossly to obtain the required medium plates. In the device, the rear of the coiling machine of the conventional hot strip mill is provided with an additional roller table; the starting area of the additional roller table is equipped with a cutting mechanism; one side of the additional roller table is provided with the cooling bed; a shifting out device is arranged between the additional roller table and the cooling bed; the tail area of the cooling bed is provided with a straightening machine; and the rear of the straightening machine is provided with a scale cross shearing mechanism. The method and the device can realize production of the medium plates with the maximum thickness of 60mm in the hot strip rolling line, also can realize alternate production of steel coils and the steel plates at the same time, effectively improve the utilization rate of the device, and increase the productivity.
Description
Technical field
The present invention relates to utilize the hot-strip production line to produce the technology of cut deal, refer to a kind of production method and equipment thereof of exempting from coiling micro-stress hot continuous rolling cut deal particularly.
Technical background
The coiling process of hot-strip is quite complicated heat, a couple of force fastening deformation process, not only coil of strip internal stress field constantly changes in the strip coiling process, and coil of strip its internal stress in uncoiling process will redistribute again, and certain flatness defect problem just may generate thus therebetween.
Batch stress state characteristics available radial component and tangential component and illustrate, as shown in Figure 1, N is that radial pressure, F are tension force among Fig. 1.Shear stress between axial stress and each circle is ignored.The shear stress that moment of torsion is batched in transmission in fact is negligible, because it does not change stress state, and can not cause the respectively slippage between the circle.People pay attention to is stress in roll coil of strip insied width direction with along the distribution situation of roll coil of strip radial direction.
Stress state characteristics in the roll coil of strip are that along the skewness on radius and the width, this is because the convexity difference makes due to the tension force F skewness.Why consider the belt steel thickness section configuration, be based between each astragal steel is not this fact that all contacts on whole width, because the band steel is the fat shape in coiling process, can think that tension force only is distributed on the contacted strip width, this means that there is a bigger tension force contact position, can replace total tension force, as shown in Figure 2, M1 represents the first lap steel among Fig. 2, and Mn represents the last lap steel, X-axis is a width, Y-axis is the coiling tension of steel, and i represents the standard value line, and k represents the contact zone, L represents spool axis, and 16 is reel.In coiling process, the contact width between each astragal steel will reduce, and concentration of tension forces is in the strip width centre (convex thickness shape); First lap contacts reel fully, thus even tension be distributed in (standard value) on the width; During in the end a few circle, contact width significantly reduces, and along with the convex value difference, super tension value can reach 4～5 times of standard value.
From the situation of coil of strip internal stress distribution as can be known, the band steel is in coiling process, along with the increase of coil diameter, for certain one deck band steel, its radial pressure increases thereupon, and is especially bigger for the i.e. place's of the taking the lead increase of coil of strip core band steel, causes the probability that bonding takes place interlayer obviously to increase thus; But for unloading the coil volume, its radial pressure successively reduces from inside to outside.But it is different again for the circumference stress rule, its minimum of a value often occurs in inner certain layer of coil of strip, and the circumference stress of band steel toe portion then increases along with its pressure and reduces to some extent, and some layer in the middle of the coil of strip reduces maximumly, if initial coiling tension is bigger, also negative value may appear.
For softer and thin band steel, when strip tension does not have banding less than initial set-point, cause the radial stress of coil of strip inside too small, thereby cause generation slippage between each layer easily and cause the volume that collapses; Although hightension can be used for avoiding collapsing the volume defective, for band steel toe portion, coiling tension is excessive, and the circumferential compressive force that causes several leading circle to be subjected to is excessive, when coil of strip is subjected to bump and waits interference between lifting or resting period, tends to produce heart-shaped defective; Hard core at present employing taper control batches technology, and after unloading volume and withdrawing from reel, invar volume internal layer shrinks inwards, and when tension force tapering curve descending slope is excessive, loose core because of tensile stress too greatly often very likely causes in volume core place.
Coil of strip is being opened at ordinary times, is subjected to the effect of uncoiling external force and plastic deformation occurs, perpendicular to the coil of strip of rolling direction transversely, can fold the plastic deformation vestige of the similar chop of a rule, just cross breaks defect.Cross breaks defect has tangible strip folding line, illustrates that this place exists local deformation excessive.The distortion of plate face is caused by residual stress, but do not find cross breaks defect in hot rolling reeling fashion, residual stress distribution when hot rolling reeling is described is not to produce the cross breaks defect reason, but some operation of opening in the flat process at coil of strip makes the stress in the steel plate that variation take place, form that a kind of stress distribution that produces cross breaks defect, caused cross breaks defect.This stress distribution can produce in the BENDING PROCESS of steel plate, and is a pressurized one side tension, and the uncoiling of coil of strip just in time is this distortion.Therefore can think that cross breaks defect is not intrinsic in the coil of strip, but add up by the outer bend moment in uncoiling and the aligning process.
The plastic bending of steel plate is not only relevant with thickness, and relevant with the yield strength of steel plate.The coil of strip less for coil diameter, that intensity is lower is held in the flat process, and the elasto bending distortion can take place, and is easy to generate cross break; And, intensity higher coil of strip big for coil diameter opened at ordinary times based on strain. be difficult for producing cross break.But along with reducing of coil diameter, especially opening flat latter stage, cross breaks defect may occur or increase the weight of.Open in the flat process actual that phenomenon has confirmed this point when finding cross break.
The most serious wave is the circular arc of coil of strip self in the coil of strip, and open at ordinary times that it belongs to just curved, the bad wave that produces of milling train control, wooden dipper song, its radius of curvature is more much bigger than coil of strip self arc radius, so the uncoiler zone is the Yi Fachu of cross breaks defect.According to investigations, cross breaks defect occurs in this place more than 80%.
To form various uneven residual stress after the hot-strip rolling.Known that deformation reason is because thermal stress, transformation stress and the phase change expansion stress in machining stress, when cooling, and batched and follow-uply open the stress that flat process produces.Wherein batch and open the flat stress influence degree maximum that produces, reason is wherein set forth in above content.Plate thickness is big more, and it is big more to the influence of production board to batch and open flat process, in the time of will being with the coil of strip crosscut to become plate, can occur multi-form and shape wave, warpage degree.
Batch and open the flat rolled steel plate shape deterioration that makes, simultaneously because the ability of coiling machine has to a certain degree limited the specification (particularly thickness) of hot continuous rolling product and the intensity rank of finished product.Existing coiling machine, the band steel maximum ga(u)ge that allows to batch does not surpass 25mm, and band hardness of steel level limit is below 800MPa.
Before the present invention proposed, the routine work line arranged that by heating furnace the coil of strip of production must batch through coiling machine, just can roll off the production line till the coiling machine.Owing to do not realize a line multipotency, so production efficiency is not high.
Summary of the invention
Purpose of the present invention is exactly that a kind of production method and equipment thereof of exempting from coiling micro-stress hot continuous rolling cut deal will be provided.Adopt this method and apparatus both can produce conventional thin strip steel coil, can produce cut deal again, and can make the maximum ga(u)ge of cut deal reach 60mm, intensity rank is brought up to more than the 1000MPa.
For achieving the above object, the method for exempting from coiling micro-stress hot continuous rolling Heavy Plate Production that the present invention is designed comprises the steps:
On the hot-strip production line, comprise successively to slab heat, the step of roughing, finish rolling, cooling, its special character is: carry out cutting after will directly passing coiling machine through the steel plate that rolls the back cooling, then steel plate movement to cold bed is lowered the temperature, again steel plate is carried out powerful straightening processing, at last steel plate is carried out the crosscut cutting, can obtain required cut deal.
Further, when the steel plate after the crosscut cutting has the shape wave defective that naked eyes can observe, in powerful straightening processing step, reduce temperature correction speed or adjust temperature correction technology, till the shape wave defective that can observe is eliminated.
For realizing the custom-designed coiling micro-stress hot continuous rolling Heavy Plate Production equipment of exempting from of said method, it comprises by heating furnace, two roller roughing units, the four-high rougher group, mm finishing mill unit, cooling section, the hot continuous rolling unit that coiling machine is connected to form successively by roller-way, its special feature is: described coiling machine back is provided with extension roller table, the initiation region of described extension roller table is equipped with cutting mechanism, one side of described extension roller table is provided with cold bed, be provided with moving-out device between described extension roller table and the cold bed, the tail region of described cold bed is provided with straightener, and the back of described straightener is provided with scale cross cut shears structure.
The invention has the advantages that: the present invention is by the organic assembling of equipment such as conventional hot rolling production line, extension roller table, cold bed, warm formula straightener, cutting, eliminated the restriction of coiling machine, the steel plate thickness and the intensity of being produced all can be increased, can realize on hot-rolling line that maximum ga(u)ge is the production of the cut deal of 60mm, the intensity rank of steel plate can be brought up to more than the 1000MPa, is discharging the production capacity that improves hot continuous rolling production line production cut deal when professional heavy and medium plate mill is produced thin plate, narrow boards production capacity.
The present invention can realize the production of conventional hot continuous rolling machine production steel coil strip, can directly produce again and avoid batching and opening flat cut deal, thereby reduce cut deal residual stress and flatness defect, such production line really embodies the technical characterstic of a line multipotency, though increase some equipment of having adorned, build the special flat production line of opening but can save, the efficient of production line can obviously improve simultaneously, has important application value.
Description of drawings
Fig. 1 is band steel tension force and pressure distribution schematic diagram when take-up;
Fig. 2 is band steel tension distribution schematic diagram when take-up;
Fig. 3 is the radial stress distribution schematic diagram of band steel at width;
Fig. 4 is a structural representation of exempting from coiling micro-stress hot continuous rolling Heavy Plate Production equipment of the present invention.
The specific embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments:
Tension force, pressure and the stress distribution of band steel are closed to tie up to and have been made labor in the background technology in Fig. 1～3, repeat no more in this.
The coiling micro-stress hot continuous rolling Heavy Plate Production equipment of exempting from shown in Figure 4, be connected to form conventional hot continuous rolling unit by heating furnace 1, two roller roughing units 3, four-high rougher group 4, mm finishing mill unit 5, cooling section 6, coiling machine 7 successively by roller-way, after coiling machine 7, assemble a segment length and be 90～150 meters extension roller table 11, to satisfy the needs of Heavy Plate Production.In the initiation region of extension roller table 11 assembling cutting mechanism 8, described cutting mechanism 8 cuts for cutting flying shear or cutting dish, can partly excise the head of steel plate, the abnormity of afterbody, perhaps steel plate is carried out cutting.In extension roller table 11 other fit on cold beds 12, the treating capacity reasonable disposition of visual on-the-spot region area of cold bed 12 length and width and steel plate.Between extension roller table 11 and cold bed 12, be equipped with moving-out device 9, this moving-out device 9 can be selected for use and shift out step rate or magnetic force hangs, steel plate can be moved to cold bed 12 by extension roller table 11 by moving-out device 9, after steel plate moves on to cold bed 12, extension roller table 11 can be admitted follow-up steel plate, adopts the moving-out device that shifts out the step rate form can avoid producing in shifting out process and scratches or scratch.
Tail region assembling straightener 13 at cold bed 12, straightener 13 adopts warm formula straightener (5～17 roller quadruple formulas aligning), steel plate is carried out the brute force aligning, further eliminate the various inhomogeneous residual stress that forms in the process, significantly improve steel-plate shape, because at this moment the steel plate body temperature can be more than 250 ℃, the effect of temperature correction can be better than routine and hold cold strong effect on the flat production line, so the leveling effect highly significant of new assignment line.
Assembling scale cross cut shears structure 14 carries out the crosscut cutting to the steel plate after the temperature correction behind straightener.Stamp pallet 15 in the 14 back settings of scale cross cut shears structure.
The course of work of the said equipment is such:
When steel plate ran to extension roller table 11 and carries out subsequent treatment, production line can be produced coil of strip, when extension roller table 11 is vacated, continued the production of steel plate, and such intersection production can at utmost improve the production efficiency of production line.Realized of the intersect production of production line coil of strip with steel plate.
The present invention to thickness the steel plate of 20～60mm carry out hot continuous rolling production, extension roller table transportation, crop end or cut, operation processing such as cold bed cooling, temperature correction are straight, scale is horizontally cut, stacking, be coils of hot-rolled steel, the steel plate production operation unit of a combination function, when guaranteeing that at utmost steel plate is straight, eliminate or reduce the residual stress of steel plate inside.
Claims (5)
1. production method of exempting from coiling micro-stress hot continuous rolling cut deal, on the hot-strip production line, comprise successively to slab heat, the step of roughing, finish rolling, cooling, it is characterized in that: carry out cutting after will directly passing coiling machine through the steel plate that rolls the back cooling, then steel plate movement to cold bed is lowered the temperature, again steel plate is carried out powerful straightening processing, at last steel plate is carried out the crosscut cutting, can obtain required cut deal; Wherein, when the steel plate after the crosscut cutting has the shape wave defective that naked eyes can observe, in powerful straightening processing step, reduce temperature correction speed or adjust temperature correction technology, till the shape wave defective that can observe is eliminated.
2. coiling micro-stress hot continuous rolling Heavy Plate Production equipment of exempting from that is used to realize the described method of claim 1, comprise by heating furnace (1), two roller roughing units (3), four-high rougher group (4), mm finishing mill unit (5), cooling section (6), the hot continuous rolling unit that coiling machine (7) is connected to form successively by roller-way, it is characterized in that: described coiling machine (7) back is provided with extension roller table (11), the initiation region of described extension roller table (11) is equipped with cutting mechanism (8), one side of described extension roller table (11) is provided with cold bed (12), be provided with moving-out device (9) between described extension roller table (11) and the cold bed (12), the tail region of described cold bed (12) is provided with straightener (13), described straightener (13) is warm formula straightener, and the back of described straightener (13) is provided with scale cross cut shears structure (14).
3. the coiling micro-stress hot continuous rolling Heavy Plate Production equipment of exempting from according to claim 2, it is characterized in that: the length of described extension roller table (11) is 90～150 meters.
4. according to claim 2 or the 3 described coiling micro-stress hot continuous rolling Heavy Plate Production equipment of exempting from, it is characterized in that: described cutting mechanism (8) is cutting flying shear or cutting circle shear.
5. according to claim 2 or the 3 described coiling micro-stress hot continuous rolling Heavy Plate Production equipment of exempting from, it is characterized in that: described moving-out device (9) is for shifting out step rate or magnetic force hangs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910061029XA CN101491812B (en) | 2009-03-06 | 2009-03-06 | Hot continuous rolling medium-and-heavy plate production method and device without coiling micro-stress |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910061029XA CN101491812B (en) | 2009-03-06 | 2009-03-06 | Hot continuous rolling medium-and-heavy plate production method and device without coiling micro-stress |
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| Publication Number | Publication Date |
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| CN101491812A CN101491812A (en) | 2009-07-29 |
| CN101491812B true CN101491812B (en) | 2011-09-07 |
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| CN200910061029XA Expired - Fee Related CN101491812B (en) | 2009-03-06 | 2009-03-06 | Hot continuous rolling medium-and-heavy plate production method and device without coiling micro-stress |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101912874B (en) * | 2010-07-14 | 2012-07-04 | 宁波钢铁有限公司 | Production method of preventing from coiling and pulling narrow of hot-rolled low carbon strip steels used for cold-rolled base plates |
| CN103042072B (en) * | 2012-12-24 | 2014-07-23 | 燕山大学 | Method for predicting hot-rolling coiling stress and inter-layer slippage based on spiral opening barrel shape |
| CN107815524A (en) * | 2017-09-18 | 2018-03-20 | 武汉百旭新材料有限公司 | A kind of microstress hot-rolled steel stretches production method |
| CN109396182B (en) * | 2018-11-13 | 2023-07-04 | 柳州钢铁股份有限公司 | Multi-line bar cutting production line |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1739872A (en) * | 2005-09-13 | 2006-03-01 | 沈阳钢铁有限责任公司 | Medium thick plate continuously casting and head-less rolling process |
| CN1775390A (en) * | 2005-12-09 | 2006-05-24 | 广东韶钢松山股份有限公司 | Medium-thick plate production process |
| CN201380183Y (en) * | 2009-04-01 | 2010-01-13 | 武汉钢铁(集团)公司 | Continuous hot rolling device capable of simultaneously satisfying production of steel band coil and flat medium plate |
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2009
- 2009-03-06 CN CN200910061029XA patent/CN101491812B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1739872A (en) * | 2005-09-13 | 2006-03-01 | 沈阳钢铁有限责任公司 | Medium thick plate continuously casting and head-less rolling process |
| CN1775390A (en) * | 2005-12-09 | 2006-05-24 | 广东韶钢松山股份有限公司 | Medium-thick plate production process |
| CN201380183Y (en) * | 2009-04-01 | 2010-01-13 | 武汉钢铁(集团)公司 | Continuous hot rolling device capable of simultaneously satisfying production of steel band coil and flat medium plate |
Non-Patent Citations (2)
| Title |
|---|
| JP特开2001-286908A 2001.10.16 |
| JP特开平11-293343A 1999.10.26 |
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Granted publication date: 20110907 Termination date: 20170306 |