CN101439356B - Tension control method of roller box type compact rolling mill for producing rod iron of large diameter - Google Patents
Tension control method of roller box type compact rolling mill for producing rod iron of large diameter Download PDFInfo
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- CN101439356B CN101439356B CN2008102434368A CN200810243436A CN101439356B CN 101439356 B CN101439356 B CN 101439356B CN 2008102434368 A CN2008102434368 A CN 2008102434368A CN 200810243436 A CN200810243436 A CN 200810243436A CN 101439356 B CN101439356 B CN 101439356B
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- milling train
- rolling
- rolling mill
- electric current
- tension
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Abstract
The invention relates to a tension control method in the metallurgical field, in particular to a rolling mill tension control method for producing a major-diameter coil rod by using a roll box-shaped compact type rolling mill. The control method comprises the following steps: adjusting rolling tension of rough and middle rolling mill units to the optimal state; recording a rolling current I1 of the rolling mill when a rolled piece passes through a No. 9 rolling mill and a No. 11 rolling mill of the middle rolling mill unit; recording a rolling current I2 of the No. 9 rolling mill or the No. 11 rolling mill again when the rolled piece is gripped into a No. 16 rolling mill of a CCR unit; comparing the rolling current I1 with the rolling current I2; improving the rotational speed of the No. 9 rolling mill or the No. 11 rolling mill to balance the tension when the rolling current I2 is less than the rolling current I1; and adjusting the telescoping amount of a loop according to the load current of the CCR unit after the rolled piece is completely gripped into the CCR unit. The control method can achieve the aim of quickly optimizing the tension control of the major-diameter coil rod, avoiding repeated steel-heaping and reducing the stoppage delay, and improving the dimension precision of the products.
Description
Technical field
The present invention relates to a kind of tension control method of field of metallurgy, the roller box type compact milling train is produced the milling train tension control method of rod iron of large diameter specifically.
Background technology
Rod iron of large diameter production line main technique flow process is: heating furnace, and----------------------------------------------------finishing----is unloaded volume----warehouse-in to the PF supply line to the air-cooled supply line of stepping to coiling machine to the 3# flying shear to the 6# water tank to pre-finishing mill group (12#-15#) to middle milling train group (8#-11#) to the CV50 flying shear to roughing unit (0#-7#) to high-pressure water descaling for 2# cuts----CCR unit (16-19 frame, 6#-9# kink) for 4#, 5# water tank.
The rod iron of large diameter production line be with wire rod production line shared one thick, in roll and pre-finish rolling production line, roll each frame in thick to adopt small tension receiving coil rolling, guarantee by type adjustment of rolled piece material and speed adjustment.The CCR unit be 16#-19# totally 4 CCR (CompactCasette Rolling Stands) milling train be that the roller box type compact milling train is produced rod iron of large diameter, the CCR milling train is 45 degree and alternately arranges that odd number frame and even number frame are distributed in the rolling line both sides.For realizing tension free rolling, be equipped with kink between each frame.Because when producing the rod iron of large diameter of different size specification, CCR unit and high line pre-finishing mill group, require to change bigger to thick, middle milling train group supplied materials material type, each in the past the switching when producing rod iron of large diameter, because the material type changes greatly, cause producing all fronts rolling tensile force and can't in time obtain adjusting, bigger to the dimensional accuracy of products influence, the product out-of-roundness does not reach more than the B class precision all the time, and product shearing displacement end to end is very big.The excessive back of rolling tensile force influences the action of CCR unit kink in addition, often causes the kink fluctuation, produces technology troubles such as heap steel, has a strong impact on the production of rod iron of large diameter, and working strength of workers is big, yields poorly during machine.
Summary of the invention
Technical problem to be solved by this invention is: at the shortcoming that above prior art exists, propose a kind of can avoiding and repeat to pile steel and reduce and shut down the milling train tension control method that the roller box type compact milling train of incuring loss through delay, improve the product size precision is produced rod iron of large diameter.
The technical scheme that the present invention solves above technical problem is:
The roller box type compact milling train is produced the milling train tension control method of rod iron of large diameter, the middle milling train group that comprises the roughing unit be made up of the 0#-7# milling train, is made up of the 8#-11# milling train, the pre-finishing mill group of being made up of the 12#-15# milling train and the CCR unit of being made up of 16#-19# milling train and 6#-9# kink, carry out according to the following steps:
(1) the mill milling tension adjustment with milling train group in thick arrives optimum, promptly little positive tension force; (for example in the normal productive process, the rolling electric current of 6# milling train is 27A, and the rolling electric current of 7# milling train is 28A, if the rolling electric current of 6# milling train diminishes, illustrate between 6# and 7# milling train to be negative tension force, the 6# rotating speed need be improved, thereby improved the rolling electric current of 6# milling train, reached the requirement of little positive tension force.)
(2) when rolled piece by middle milling train group the 9# milling train or during the 11# milling train (during rolling different size rod iron of large diameter thick in roll last frame), write down the rolling electric current I 1 of this milling train;
(3) after rolled piece is nipped the 16# milling train of CCR unit, write down the rolling electric current I 2 of 9# milling train or 11# milling train once more;
(4) the rolling electric current I 2 of the rolling electric current I 1 of comparison step (2) and step (3), if rolling electric current I 2 is less than rolling electric current I 1, the rotating speed that then improves 9# milling train or 11# milling train increases 6# kink cover amount, reach the effect of balance tension, if rolling electric current I 2 is greater than rolling electric current I 1, the rotating speed that then reduces 9# milling train or 11# milling train reduces 6# kink cover amount, reaches the effect of balance tension; (when electric current changes, illustrate between 9# milling train or 11# milling train and the CCR unit it is negative tension state, can carry out two operations and eliminate negative tension force between 9# milling train or 11# milling train and the CCR unit, the rotating speed that can change 9# milling train or 11# milling train changes 6# kink cover amount, reaches the requirement of little positive tension force.)
(5) after rolled piece is all nipped the CCR unit, carry out the adjustment of kink cover amount according to the load current of CCR unit.Kink is in the effect of playing tension force between automatic adjusting milling train between the CCR milling train, and the cover amount of kink is the movable scope of kink, if kink is being set the tension force that can not eliminate under the cover amount between milling train, and so just need be from new settings cover amount.The load current of milling train can react the tension condition between milling train, and the adjustment of cover amount can be eliminated tension force between milling train.
In the step (4), load current and rotating speed have relation, do not have quantitative relationship when load, and quantitative relationship is arranged when zero load, during ordinary production, the range of speeds of adjusting tension force between milling train is very little, has only several commentaries on classics or tens commentaries on classics, if when tension force is very big between milling train, will cause heap steel accident, when adjusting the milling train revolution, only need several commentaries on classics of adjustment or tens to change and generally can both reach requirement, promptly reach the requirement of little positive tension force.
Advantage of the present invention is: control method of the present invention can reach the control of rapid Optimum rod iron of large diameter tension force, realizes avoiding repeating to pile steel and reducing and shut down the purpose of incuring loss through delay, improving the product size precision.Output increases substantially in the time of can making the machine of rod iron of large diameter production by control method of the present invention, and fault reduces significantly, and dimensional accuracy of products has also obtained qualitative leap, and B, C level rate product have reached 83%.
The specific embodiment
When the milling train tension control method of roller box type compact milling train production rod iron of large diameter of the present invention is specifically implemented, when beginning to produce, the rolling tensile force that rolls in thick is adjusted to optimum; When rolled piece during (during rolling different size rod iron of large diameter thick in roll last frame) by 9# or 11# frame, observe 9# or the rolling electric current of 11#, after rolled piece is nipped the 16#CCR milling train, observe the rolling electric current of 9# or 11# once more, as find that rolling electric current diminishes suddenly, illustrate that rolling tensile force is bigger between 16#CCR milling train and 9# or the 11#, increase 6# kink cover amount by improving 9# or 11# milling train rotating speed this moment, reaches the effect of balance tension.After rolled piece is all nipped CCR milling train formation stable rolling,, part the rolling effect of power a little to reach full roll line according to the load current amount of the overlapping adjustment once more of CCR milling train.
Embodiment one
Present embodiment is used for the production of φ 18mm rod iron of large diameter, specifically implements as follows:
(1) the mill milling tension adjustment with milling train group in thick arrives optimum, is little positive tension force.
(2) when the 11# milling train of rolled piece by middle milling train group, write down the rolling electric current I 1 of this milling train;
(3) after rolled piece is nipped the 16# milling train of CCR unit, write down the rolling electric current I 2 of 11# milling train once more;
(4) the rolling electric current I 2 of the rolling electric current I 1 of comparison step (2) and step (3), if rolling electric current I 2 is less than rolling electric current I 1, the rotating speed that then improves the 11# milling train increases 6# kink cover amount, reach the effect of balance tension, more than or equal to rolling electric current I 1, the rotating speed that then reduces the 11# milling train reduces 6# kink cover amount as if rolling electric current I 2, reach the effect of balance tension, when adjusting the milling train revolution, only need several commentaries on classics of adjustment or tens to change and generally can both reach requirement, promptly reach the requirement of little positive tension force;
(5) after rolled piece is all nipped the CCR unit, load current according to the CCR unit carries out the adjustment of kink cover amount, kink is in the effect of playing tension force between automatic adjusting milling train between the CCR milling train, the cover amount of kink is the movable scope of kink, if kink is being set the tension force that can not eliminate under the cover amount between milling train, so just need be from new settings cover amount.The load current of milling train can react the tension condition between milling train, and the adjustment of cover amount can be eliminated tension force between milling train.
Embodiment two
(1) the mill milling tension adjustment with milling train group in thick arrives little positive tension force.
(2), write down the rolling electric current I 1 of this milling train when the 9# milling train of rolled piece by middle milling train group;
(3) after rolled piece is nipped the 16# milling train of CCR unit, write down the rolling electric current I 2 of 9# milling train once more;
(4) the rolling electric current I 2 of the rolling electric current I 1 of comparison step (2) and step (3), if rolling electric current I 2 is less than rolling electric current I 1, the rotating speed that then improves the 9# milling train increases 6# kink cover amount, reach the effect of balance tension, more than or equal to rolling electric current I 1, the rotating speed that then reduces the 9# milling train reduces 6# kink cover amount as if rolling electric current I 2, reach the effect of balance tension, when adjusting the milling train revolution, only need several commentaries on classics of adjustment or tens to change and generally can both reach requirement, promptly reach the requirement of little positive tension force;
(5) after rolled piece is all nipped the CCR unit, load current according to the CCR unit carries out the adjustment of kink cover amount, kink is in the effect of playing tension force between automatic adjusting milling train between the CCR milling train, the cover amount of kink is the movable scope of kink, if kink is being set the tension force that can not eliminate under the cover amount between milling train, so just need be from new settings cover amount.The load current of milling train can react the tension condition between milling train, and the adjustment of cover amount can be eliminated tension force between milling train.
The present invention can also have other embodiment, and the technical scheme that equal replacement of all employings or equivalent transformation form all drops within the scope of protection of present invention.
Claims (1)
1. the roller box type compact milling train is produced the milling train tension control method of rod iron of large diameter, the middle milling train group that comprises the roughing unit be made up of the 0#-7# milling train, is made up of the 8#-11# milling train, the pre-finishing mill group of being made up of the 12#-15# milling train and the CCR unit of being made up of 16#-19# milling train and 6#-9# kink; Carry out according to the following steps:
(1), writes down the rolling electric current I 1 of this milling train when the 9# milling train or the 11# milling train of rolled piece by middle milling train group;
(2) after rolled piece is nipped the 16# milling train of CCR unit, write down the rolling electric current I 2 of 9# milling train or 11# milling train once more;
(3) the rolling electric current I 2 of the rolling electric current I 1 of comparison step (2) and step (3), if rolling electric current I 2 is less than rolling electric current I 1, the rotating speed that then improves 9# milling train or 11# milling train comes balance tension, if rolling electric current I 2 is more than or equal to rolling electric current I 1, the rotating speed that then reduces 9# milling train or 11# milling train comes balance tension;
It is characterized in that: in described step (1) before, with the mill milling tension adjustment of milling train group in thick to little positive tension force;
In described step (3) afterwards, after rolled piece is all nipped the CCR unit, carry out the adjustment of kink cover amount according to the load current of CCR unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102434368A CN101439356B (en) | 2008-12-23 | 2008-12-23 | Tension control method of roller box type compact rolling mill for producing rod iron of large diameter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102434368A CN101439356B (en) | 2008-12-23 | 2008-12-23 | Tension control method of roller box type compact rolling mill for producing rod iron of large diameter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101439356A CN101439356A (en) | 2009-05-27 |
| CN101439356B true CN101439356B (en) | 2010-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008102434368A Expired - Fee Related CN101439356B (en) | 2008-12-23 | 2008-12-23 | Tension control method of roller box type compact rolling mill for producing rod iron of large diameter |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103372570B (en) * | 2012-04-24 | 2015-07-22 | 宝山钢铁股份有限公司 | Cold rolling process segment auxiliary roll automatic speed regulation method |
| CN103230942B (en) * | 2013-04-27 | 2015-06-03 | 内蒙古包钢钢联股份有限公司 | Method for adjusting and controlling tension between rolling mills |
| CN106269857B (en) * | 2016-08-26 | 2019-03-05 | 无锡兴澄特种材料有限公司 | The production technology that carbon steel is coiled |
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Owner name: NANJING NANGANG INDUSTRY DEVELOPMENT CO., LTD. Free format text: FORMER OWNER: NANJING UNITE STEEL CO., LTD. Effective date: 20091218 |
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Effective date of registration: 20091218 Address after: Liuhe District of Nanjing City, Jiangsu Province, xiejiadian post encoding: 210035 Applicant after: Nanjing Iron & Steel United Co., Ltd. Address before: Liuhe District of Nanjing City, Jiangsu Province, xiejiadian post encoding: 210035 Applicant before: Nanjing Iron & Steel United Co., Ltd. |
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Granted publication date: 20101103 Termination date: 20161223 |