CN103230940A - Controlling method for reduction of four-strand slitting line differences and structure property differences - Google Patents
Controlling method for reduction of four-strand slitting line differences and structure property differences Download PDFInfo
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Abstract
The invention relates to a controlling method for reduction of four-strand slitting line differences and structure property differences and belongs to the technical field of production of steel for construction steel bars. A relation model of line differences and hole patterns L and a simulating calculation model of the hole pattern filling degree L are built for instructing the hole pattern design effectively. The four-strand difference is -31mm through calculation under the condition that the mill springing is 0.2mm, and accordingly, the test development cycle is decreased greatly, and the test risk and the test cost are reduced; and accidents of wave bending, disorderly steel on cooling beds, steel stacking at flying shearing positions and the like are reduced, and the yield is improved. Besides, by means of a controlled rolling and controlled cooling technology, the usage amount of micro-alloy can be reduced apparently, and the tenacity of materials is enhanced simultaneously. Utilization of the controlled rolling and controlled cooling technology on steel bar products of large and medium specifications is mature, and as for four-strand slitting of steel bar products of small specifications in a range of phi 12mm to phi 14mm, through horizontal adjustment of different circular seam openings of four strands, the four-strand cooling uniformity is improved apparently, and the four-strand structure property stability is improved; and the four-strand yield strength Rel is smaller than or equal to 25 MPa, and the tensile strength is smaller than or equal to 20 MPa.
Description
Technical field
The invention belongs to building iron steel production technical field.Particularly relate to a kind of control method that reduces four-line syncopate line difference and structure property difference.
Background technology
Small dimension reinforcing bar product (Φ 10mm-Φ 14mm) is compared with big specification (Φ 16mm-Φ 32mm), and profit margin is bigger, and main cause is that small dimension production efficiency is low, and the production difficulty is big.Be the effective way that improves small dimension production efficiency and adopt multi-thread cutting, realized five line cuttings as existing minority producer both at home and abroad in Φ 10mm specification, realized four-line syncopate in Φ 12mm-Φ 14mm specification.
Yet in the Φ 12mm-Φ 14mm four-line syncopate operation of rolling, because being subjected to the influence of factors such as pass schedule parameter, mill spring, groove wearing and tearing, each line workpiece measurement all can be not quite identical, namely exists four line lines poor.The line difference is easy to cause accidents such as wave is curved, the random steel of cold bed, flying shear place heap steel when big.In above influence factor, rationally whether the pass schedule parameter designing produces considerable influence to four segmentation lines differences.The basic reason that the line difference produces is that the four-line syncopate area of section does not wait, and causes in identical rolling under the fast condition each line second flow amount difference.
In addition, cooling controlling and rolling controlling process can significantly reduce the microalloy consumption of material, promote the obdurability of material simultaneously, the reinforcing bar product uses this controlled rolling and controlled cooling technology ripe in big or middle specification, but on the small dimension of Φ 12mm-Φ 14mm four-line syncopate, rarely have and successfully use this technology, this mainly is that inhomogeneous cooling is even because small dimension exists, quad is knitted problems such as poor performance.
The problem that exists in this production technical field both at home and abroad has at present:
1) the unreasonable meeting of pass parameter designing causes four line length direction line differences obvious, the four-line syncopate reinforcing bar generally can be controlled in about 1000mm in 90m scale line difference at present, the line difference is easy to cause accidents such as wave is curved, the random steel of cold bed, flying shear place heap steel when big, reduced lumber recovery and yield in unit time;
2) control for four line differences before lacks scientific theory calculating, mainly is that blindness is strong by experience adjustments pass parameter, and the construction cycle is long and cost is high, and empirical risk is big;
3) four lines are in the splitting rolling process, because the flow of metal characteristics, middle two line temperature are apparently higher than side two lines, and huge temperature contrast causes that quad is knitted, mechanical property difference is very big, causes four-line syncopate small dimension product stable mechanical property poor;
4) small dimension exists inhomogeneous cooling problem even, that quad is knitted poor performance to limit the possibility of small dimension four-line syncopate employing cooling controlling and rolling controlling process reduction microalloy consumption.
The basic reason that the line difference produces is that the four-line syncopate area of section does not wait, and causes in identical rolling under the fast condition each line second flow amount difference.Patent exploitation of the present invention one cover theoretical model be used for to calculate the different pass parameters difference that rolls off the production line, instruct the pass design, it is poor to dwindle four lines, this is significant for reducing steel rolling heap steel accident rate and improving lumber recovery; Developed four line water-cool control schemes a kind of, for improving four line cooling uniformities, reducing quad, to knit poor performance significant.
Summary of the invention
The object of the present invention is to provide a kind of control method that reduces four-line syncopate line difference and structure property difference, the relational model of line difference and pass degree of filling L value and the Simulation Calculation of pass degree of filling L have been set up, be used in reference to the design of guide hole type effectively, calculating in mill spring is under the 0.2mm condition, four line differences are-31mm to have dwindled the pilot development cycle greatly, reduced empirical risk and experimentation cost; Reduce accidents such as wave is curved, the random steel of cold bed, flying shear place heap steel, improved lumber recovery.In addition, cooling controlling and rolling controlling process can significantly reduce the microalloy consumption of material, promote the obdurability of material simultaneously, the reinforcing bar product uses this controlled rolling and controlled cooling technology ripe in big or middle specification, but on the small dimension of Φ 12mm-Φ 14mm four-line syncopate, rarely have and successfully use this technology, this mainly is that inhomogeneous cooling is even because small dimension exists, quad is knitted problems such as poor performance.A kind of four line water-cool control schemes of exploitation, by four lines not the level of copper ring seam aperture regulate, significantly improved four line cooling uniformities, improved the stability that quad is knitted performance.Can guarantee four line yield strength R
El≤ 25MPa, tensile strength R
m≤ 20MPa.Concrete processing step is as follows:
1, the relation of line difference and pass degree of filling L value is calculated: for further the research degree of filling is to the influence of line difference generation, definition nominal size L is the rolling center line of four-line syncopate and actual rolled piece limit portion distance, the mm of unit.By assignment L, adopt area-method to calculate center line area S respectively
Center lineArea S with the sideline
The sideline, be that line is poor with the conversion of 90m finished product rolled piece then; The sideline can be shorter than center line when owing to be full of, and the line difference shows as "+" value; Cross that the sideline is longer than center line when being full of, the line difference shows as "-" value, and perfect condition is that pass is in critical full state, namely neither crosses to be full of and does not also owe to be full of.The line that adopts the method can calculate under the different degree of filling L values is poor.
2, the simulation calculation of pass degree of filling L: adopt the wired meta software of DERROM to set up in the process of rolled piece threedimensional model, do following hypothesis: (1) is in the operation of rolling, removing interior end to end is the unstable state operation of rolling, and all the other integral body are rolling to be the stable state operation of rolling; (2) operation of rolling that experiences along the position in the rolling scope of all stable states on the length of rolled piece direction has repeatability, the as-rolled condition basically identical.Based on above hypothesis, that model simplification is as follows: the operation of rolling simulation all fronts continuous rolling process of setting up a bit of rolled piece provides possibility, but must satisfy the length of this a bit of deformation of rolled wire body greater than the contact arc length of twice.Roll is considered as the constant temperature rigid body in the model, and roller temperature is 200 ℃; It is linear that 900 ℃ of the initial surface temperature of rolled piece, 1050 ℃ of core temperature, the core table temperature difference are; Boundary condition has friction condition and heat transfer condition: adopt shearing friction on roll and the rolled piece contact-making surface, coefficient of friction 0.5.The heat transfer boundary condition comprises rolled piece and the comprehensive heat friendship of surrounding environment coefficient 0.15kw/ (m
2K), the equivalence heat of roll and rolled piece is handed over coefficient 10 kw/ (m
2K).Adopt the method can calculate degree of filling L value under the different pass parameters.
3, four-line slitting hole-shape parameter optimization result: the relation of line difference and pass degree of filling L value is calculated and the simulation calculation of pass degree of filling L by as above area-method, instructed the pass parameter designing, advance after too much suboptimization designs, draw optimal result: K
6The anapsid drafts is 17.5mm; Fixed width pass K
5Width is 58mm; Pre-slitting pass K
4The wedge spacing is 5.5mm, and cutting hole half angle of wedge in both sides is 37.5 °, and center line cutting hole half angle of wedge is 38.5 °, and roll gap is 2.6mm; Slitting pass K
3The wedge spacing is 0.84mm, and cutting hole half angle of wedge in both sides is 43.8 °, and center line cutting hole half angle of wedge is 35.4 °, and roll gap is 2.8mm.Other concrete parameter adopts this cover pass, K as shown in Figure 3
3Pass degree of filling L value is 32.2mm, this moment the Molded Line difference be respectively-70mm(mill spring is 0) and-31mm(mill spring is 0.2mm).
4, the cooling of four lines adopts independent circumferential weld to regulate parameter: behind the four-line syncopate, middle two line temperature are apparently higher than avris two lines, and as shown in Figure 8, middle two line temperature are at 1000-1020 ℃, and avris two line temperature are at 900-930 ℃.In the cooling control after rolling stage, the cooling water pipe of four line parallels is common to one and comes the supply mains, and by the independently circumferential weld aperture adjusting of four lines, the horizontal aperture adjustable range of circumferential weld is 0-45mm, can be by increasing the center line intensity of cooling, reduce the sideline intensity of cooling, thereby dwindle the organization mechanics poor performance of four lines.Can guarantee four line yield strength R
El≤ 25MPa, tensile strength R
m≤ 20MPa.
The invention has the advantages that: developed a cover four line line difference control methods at home and abroad first, instructed the pass design, dwindled the pilot development cycle, reduced empirical risk; Significantly improve four line cooling uniformities, improved the stability that quad is knitted performance.
Description of drawings
The definition schematic diagram of Fig. 1 full level L.
Four slitting pass figure (K among Fig. 2 embodiment 1
6)
Four slitting pass figure (K among Fig. 3 embodiment 1
5).
Four slitting pass figure (K among Fig. 4 embodiment 1
4).
Four slitting pass figure (K among Fig. 5 embodiment 1
3).
Slitting pass K among Fig. 6 embodiment 1
3The degree of filling simulation.
Slitting pass K among Fig. 7 embodiment 2
3The degree of filling simulation.
Fig. 8 four line temperature field differences.
The specific embodiment
Embodiment 1:
Adopt the pass parameter of accompanying drawing 2, utilize area-method to calculate line difference and K
3The relation of full level, as shown in table 1, considered respectively to be respectively 0 and two kinds of different conditions of 0.2mm in mill spring.As shown in Figure 3, adopt DEFFORM finite element software simulation calculation this cover pass incision divide hole K
3Actual full level L value be 31.8mm, pair look after with table 1, this moment the Molded Line difference to be respectively 1523mm(mill spring be 0) and 1625mm(mill spring be 0.2), it is unreasonable that result of calculation shows that this cover pass designs, the line difference is bigger.
Table 1 line difference and K
3The relation of full level (L value)
Embodiment 2:
On pass basis shown in the accompanying drawing 2, K
6The hole height changes 17.5mm into from 18.5mm; Fixed width hole K
5The hole changes 58mm into from 57mm; Pre-cutting K
4Two sideline sidewalls, half angle of wedge makes 37.5 ° into by 36.0 °; Slitting pass K
3The two sideline sidewall angles of wedge increase to 43.8 ° from 40.4 °, utilize area-method to calculate line difference and K
3The relation of full level (L value), as shown in table 2.Adopt DEFFORM finite element software simulation calculation this cover pass incision divide hole K
3Actual full level L value be 32.2mm, as shown in Figure 4.The table of comparisons 2 see this moment the Molded Line difference be respectively-70mm(mill spring is 0) and-31mm(mill spring is 0.2).
Table 2 line difference and K
3The relation of full level (L value)
Embodiment 3:
Roll aftercooler circumferential weld value (the horizontal aperture of four wire loop seams is regulated and is respectively 30mm, 38mm, 35mm, 29mm) by adjusting, reduce by two intensities of cooling of side, cold bed temperature is reached unanimity.After adjusting, the mechanical property undulating value significantly reduces.Trade mark HRB400E, specification
14mm, four lines remember respectively and do 1
#, 2
#, 3
#, 4
#
Four linearize ingredient w .t.% of a steel billet correspondence of table 3
Table 4 rolling technological parameter
Four line traffic controls cold cooler circumferential weld value and the mechanical property of a steel billet correspondence of table 5
Claims (1)
1. a control method that reduces four-line syncopate line difference and structure property difference is characterized in that, the control step is as follows:
(1) relation of line difference and pass degree of filling L value is calculated: definition nominal size L is the rolling center line of four-line syncopate and actual rolled piece limit portion distance, the mm of unit; By assignment L, adopt area-method to calculate center line area S respectively
Center lineArea S with the sideline
The sideline, be that line is poor with the conversion of 90m finished product rolled piece then;
(2) simulation calculation of pass degree of filling L: adopt the wired meta software of DERROM to set up in the process of rolled piece threedimensional model, do following hypothesis:
1) in the operation of rolling, removing interior end to end is the unstable state operation of rolling, and all the other integral body are rolling to be the stable state operation of rolling;
2) operation of rolling that experiences along the position in the rolling scope of all stable states on the length of rolled piece direction has repeatability, the as-rolled condition unanimity;
Based on above hypothesis, that model simplification is as follows:
The operation of rolling simulation all fronts continuous rolling process of setting up a bit of rolled piece provides possibility, but must satisfy the length of this a bit of deformation of rolled wire body greater than the contact arc length of twice; Roll is considered as the constant temperature rigid body in the model, and roller temperature is 200 ℃; It is linear that 900 ℃ of the initial surface temperature of rolled piece, 1050 ℃ of core temperature, the core table temperature difference are; Boundary condition has friction condition and heat transfer condition: adopt shearing friction on roll and the rolled piece contact-making surface, coefficient of friction 0.5; The heat transfer boundary condition comprises rolled piece and the comprehensive heat friendship of surrounding environment coefficient 0.15kw/ (m
2K), the equivalence heat of roll and rolled piece is handed over coefficient 10 kw/ (m
2K); Adopt the method to calculate degree of filling L value under the different pass parameters;
(3) four-line slitting hole-shape parameter optimization result: repeatedly after the optimal design, draw optimal result: K
6The anapsid drafts is 17.5mm; Fixed width pass K
5Width is 58mm; Pre-slitting pass K
4The wedge spacing is 5.5mm, and cutting hole half angle of wedge in both sides is 37.5 °, and center line cutting hole half angle of wedge is 38.5 °, and roll gap is 2.6mm; Slitting pass K
3The wedge spacing is 0.84mm, and cutting hole half angle of wedge in both sides is 43.8 °, and center line cutting hole half angle of wedge is 35.4 °, and roll gap is 2.8mm.Adopt this cover pass, K
3Pass degree of filling L value is 32.2mm, and this moment, the Molded Line difference was-31mm that mill spring is 0.2;
The cooling of (4) four lines adopts independent circumferential weld to regulate parameter: behind the four-line syncopate, middle two line temperature are at 1000-1020 ℃, and avris two line temperature are at 900-930 ℃; In the cooling control after rolling stage, the cooling water pipe of four line parallels is common to one and comes the supply mains, and by the independently circumferential weld aperture adjusting of four lines, the horizontal aperture adjustable range of circumferential weld is 0-45mm, by increasing the center line intensity of cooling, reduce the sideline intensity of cooling, thereby dwindle the organization mechanics poor performance of four lines; Guarantee four line yield strength R
El≤ 25MPa, tensile strength R
m≤ 20MPa.
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|---|---|---|---|
| CN201310125363.3A CN103230940B (en) | 2013-04-11 | 2013-04-11 | Controlling method for reduction of four-strand slitting line differences and structure property differences |
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| CN201310125363.3A CN103230940B (en) | 2013-04-11 | 2013-04-11 | Controlling method for reduction of four-strand slitting line differences and structure property differences |
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| CN103230940A true CN103230940A (en) | 2013-08-07 |
| CN103230940B CN103230940B (en) | 2014-10-29 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105032936A (en) * | 2015-06-29 | 2015-11-11 | 四川省达州钢铁集团有限责任公司 | Slitting rolling technology |
| CN105290106A (en) * | 2015-11-30 | 2016-02-03 | 山东石横特钢集团有限公司 | Low-temperature control rolling and splitting process method and device for ribbed steel bars |
| CN106345805A (en) * | 2016-08-31 | 2017-01-25 | 云南德胜钢铁有限公司 | Three-strand splitting rolling method for rebars with diameter phi of 12 mm |
| CN111091537A (en) * | 2019-11-28 | 2020-05-01 | 攀钢集团攀枝花钢钒有限公司 | Evaluation method of full-rolling-process simulation hole pattern fullness |
| CN112139240A (en) * | 2020-08-11 | 2020-12-29 | 柳州钢铁股份有限公司 | Production method for reducing performance line difference of reinforcing steel bar |
| CN112139239A (en) * | 2020-08-11 | 2020-12-29 | 柳州钢铁股份有限公司 | Split reinforcing steel bar with small performance line difference |
| CN112170492A (en) * | 2020-09-24 | 2021-01-05 | 宁夏建龙龙祥钢铁有限公司 | Many segmentations production minus tolerance stabilising arrangement |
| CN112404131A (en) * | 2020-10-30 | 2021-02-26 | 张家港宏昌钢板有限公司 | Method for controlling strip uniformity of cutting pass of deformed steel bar |
| CN112845603A (en) * | 2021-02-01 | 2021-05-28 | 新疆八一钢铁股份有限公司 | Method for reducing phi 14 four-line split thread multiple-length drop |
| CN113333467A (en) * | 2021-05-17 | 2021-09-03 | 山东莱钢永锋钢铁有限公司 | Four-slit hole type system with phi 16 specifications of bars |
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|---|---|---|---|---|
| CN105032936A (en) * | 2015-06-29 | 2015-11-11 | 四川省达州钢铁集团有限责任公司 | Slitting rolling technology |
| CN105032936B (en) * | 2015-06-29 | 2017-11-07 | 四川省达州钢铁集团有限责任公司 | A kind of slit rolling process |
| CN105290106A (en) * | 2015-11-30 | 2016-02-03 | 山东石横特钢集团有限公司 | Low-temperature control rolling and splitting process method and device for ribbed steel bars |
| CN105290106B (en) * | 2015-11-30 | 2017-10-31 | 石横特钢集团有限公司 | A kind of Ribbed Bar bar low temperature controlled rolling cutting process and device |
| CN106345805A (en) * | 2016-08-31 | 2017-01-25 | 云南德胜钢铁有限公司 | Three-strand splitting rolling method for rebars with diameter phi of 12 mm |
| CN106345805B (en) * | 2016-08-31 | 2019-01-01 | 云南德胜钢铁有限公司 | A kind of three-slitting rolling method of φ 12mm reinforcing bar |
| CN111091537A (en) * | 2019-11-28 | 2020-05-01 | 攀钢集团攀枝花钢钒有限公司 | Evaluation method of full-rolling-process simulation hole pattern fullness |
| CN111091537B (en) * | 2019-11-28 | 2022-06-10 | 攀钢集团攀枝花钢钒有限公司 | Method for evaluating full rolling process simulation hole pattern fullness |
| CN112139239A (en) * | 2020-08-11 | 2020-12-29 | 柳州钢铁股份有限公司 | Split reinforcing steel bar with small performance line difference |
| CN112139240A (en) * | 2020-08-11 | 2020-12-29 | 柳州钢铁股份有限公司 | Production method for reducing performance line difference of reinforcing steel bar |
| CN112139240B (en) * | 2020-08-11 | 2023-04-07 | 柳州钢铁股份有限公司 | Production method for reducing performance line difference of reinforcing steel bar |
| CN112139239B (en) * | 2020-08-11 | 2023-04-14 | 柳州钢铁股份有限公司 | Split reinforcing steel bar with small performance line difference |
| CN112170492A (en) * | 2020-09-24 | 2021-01-05 | 宁夏建龙龙祥钢铁有限公司 | Many segmentations production minus tolerance stabilising arrangement |
| CN112404131A (en) * | 2020-10-30 | 2021-02-26 | 张家港宏昌钢板有限公司 | Method for controlling strip uniformity of cutting pass of deformed steel bar |
| CN112845603A (en) * | 2021-02-01 | 2021-05-28 | 新疆八一钢铁股份有限公司 | Method for reducing phi 14 four-line split thread multiple-length drop |
| CN113333467A (en) * | 2021-05-17 | 2021-09-03 | 山东莱钢永锋钢铁有限公司 | Four-slit hole type system with phi 16 specifications of bars |
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