CN103191929B - Technological method for reducing belt breaking times in rolling mill starting - Google Patents
Technological method for reducing belt breaking times in rolling mill starting Download PDFInfo
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- CN103191929B CN103191929B CN201310108154.8A CN201310108154A CN103191929B CN 103191929 B CN103191929 B CN 103191929B CN 201310108154 A CN201310108154 A CN 201310108154A CN 103191929 B CN103191929 B CN 103191929B
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Abstract
The invention provides a technological method for reducing belt breaking times in rolling mill starting. The technological method for reducing belt breaking times in rolling mill starting is applied to the technical field of cold-rolled sheet steel rolling processes and comprises the steps of (1) increasing the set target thickness at the band steel outlet portion by 30%-40% before a rolling mill shuts down; (2) reducing positive roll bending force exerted by machine frames onto working rolls after a target thickness value is increased; (3) modifying the target thickness and shutting down the rolling mill after weld joints are sheared by the rolling mill; and (4) recovering the target thickness before the rolling mill is started again and recovering the positive roll bending force of the machine frames after rolling is stable. By means of the technological method, happened belt breaking accidents in starting can be solved when the rolling mill is started, accordingly unit yield is improved, and the number of abnormally offline rolls is decreased. The yield can be improved by decreasing the belt breaking times in starting, and the number of the abnormally offline rolls caused by belt breaking is obviously reduced.
Description
Technical field
The invention belongs to flat cold-rolled sheet steel rolling process technical field, more particularly, relate to a kind of process reducing mill star-up broken belt.
Background technology
Tandem mills is Total continuity four frame (four frames are frame F1, frame F2, frame F3, frame F4 respectively) six roller complete hydraulic pressing AGC milling train, and rolled products specification all has requirement to exit thickness and width.When incoming hot rolled slab thickness in the margin of tolerance, dynamic variable specification meets technological requirement, the automatic thickness control system of milling train all can keep efficient rolling, and the Out-gauge length of band steel all can effectively control, and lumber recovery, the production efficiency of product are all higher.But this mode of production is based upon unit continous rolling basis, again start (as technique roll change once shutting down appears in unit, cancel closedown) so just need to re-establish stable rolling process, band steel finished product thickness is made to reach setting requirement, and thin gauge strip splits the weak characteristic of ability because bearing tension, the each gantry speed coupling of milling train is subject in start-up course, often there is to start broken belt in the factor impacts such as the linear velocity that roll diameter of roller difference produces is inconsistent, must threading again, this not only has a strong impact on production efficiency and also has influence on unit lumber recovery, the online life cycle of roll.Although domestic and international same type units reduces broken belt by depressing in advance by frame to start, the overproof partial-length of head thickness strengthens lumber recovery and loses larger.
Summary of the invention
Technical problem to be solved by this invention is: for the deficiencies in the prior art, a kind of can solution when mill star-up is provided to start the generation of broken belt accident, thus improve unit lumber recovery, reduce the process of the minimizing mill star-up broken belt of abnormal off-line roll quantity.
Solve above-described technical problem, the technical scheme that the present invention takes is:
The present invention is a kind of process reducing mill star-up broken belt, and described milling train comprises frame, working roll, control assembly, and the step of the process of described minimizing mill star-up broken belt is:
(1), before the milling train described in is shut down, the target thickness of band steel exports portion setting is increased by 30%-40%;
(2) after increasing target thickness numerical value, and each frame applying positive bending roller force is on the work rolls reduced;
(3) modifying target thickness, weld seam is sheared rear milling train by milling train and is shut down;
(4) milling train recovers target thickness before again starting, the positive bending roller force of each frame of stable rear recovery to be rolled.
Preferably, before milling train is shut down, operating personnel increase the target thickness of setting by control assembly, and the thickness of the band steel shut out in band steel exports portion increases by more than 30%, and the actual (real) thickness of the band steel now shut out from band steel exports portion increases.
Preferably; after thickness with steel exports portion increases; weld seam is sheared rear operating personnel by milling train and is controlled milling train shutdown by control assembly; before milling train starts again; band steel exports portion thickness recovers to be set to target thickness by control assembly by operating personnel again; belt steel thickness with steel exports portion returns to target thickness numerical value again, and milling train recovers normal work.
Preferably, reduce each frame when applying positive bending roller force on the work rolls, the compression produced in the middle part of band steel cross section is greater than the compression that two edge produce, and the both sides position of working roll to band steel applies additional compression.
Adopt technical scheme of the present invention, following beneficial effect can be obtained:
The process of minimizing mill star-up broken belt of the present invention, can solve when mill star-up and start the generation of broken belt accident, thus improve unit lumber recovery, reduces abnormal off-line roll quantity.Can improve lumber recovery by reducing startup broken belt frequency, the abnormal off-line roll quantity caused because of broken belt obviously reduces.
Accompanying drawing explanation
Brief description is made to the content expressed by each accompanying drawing of this description and the mark in figure below:
Fig. 1 is the schematic flow sheet of the process of minimizing mill star-up broken belt of the present invention;
Fig. 2 is each parameter chart of milling train when adopting method processed finished products thickness * width of the present invention to be the band steel of 0.5mm*1000mm;
Fig. 3 is each parameter chart of milling train when adopting method processed finished products thickness * width of the present invention to be the band steel of 0.4mm*1000mm;
Detailed description of the invention
Contrast accompanying drawing below, by the description to embodiment, the effect and operation principle etc. of the specific embodiment of the present invention as the mutual alignment between the shape of involved each component, structure, each several part and annexation, each several part are described in further detail:
As shown in accompanying drawing 1-accompanying drawing 3, the present invention is a kind of process reducing mill star-up broken belt, and milling train comprises frame, working roll, control assembly, and the step reducing the process of mill star-up broken belt is:
(1), before the milling train described in is shut down, the target thickness of band steel exports portion setting is increased by 30%-40%;
(2) after increasing target thickness numerical value, and each frame applying positive bending roller force is on the work rolls reduced;
(3) modifying target thickness, weld seam is sheared rear milling train by milling train and is shut down;
(4) milling train recovers target thickness before again starting, the positive bending roller force of each frame of stable rear recovery to be rolled.
Preferably, milling train is before shutdown, and operating personnel increase the band steel target thickness of setting by control assembly, and the thickness of the band steel shut out in band steel exports portion increases by more than 30%, and the actual (real) thickness of the band steel now shut out from band steel exports portion increases.When such milling train starts again, the belt steel thickness shut out increases than the band steel target thickness of setting, improves the anti-stretch breaking strength of strip section, reduces the speed of service difference of milling train as far as possible to the impact of the band steel of thinner thickness, thus avoid mill star-up broken belt.
In process of the present invention; if band steel is at the exit thickness≤0.5mm of milling train export department; then before shutdown, band steel is increased by more than 30% at the target thickness of the setting in band steel exports portion; like this; after milling train is started shooting again, the actual (real) thickness of band steel is greater than original target thickness, will avoid band steel generation broken belt problem; thus solve after in prior art, milling train is started shooting again, easily there is the problem of broken belt in band steel.
Preferably; after the thickness increase in described band steel exports portion; operating personnel control milling train by control assembly and shut down; before milling train starts again; band steel exports portion thickness is re-set as target thickness by control assembly by operating personnel; belt steel thickness with steel exports portion returns to target thickness numerical value again, and milling train recovers normal work.Make to carry out on thicker belts steel during mill star-up, just improve it and bear tension and split ability.
Preferably, reduce each frame when applying positive bending roller force on the work rolls, the compression produced in the middle part of band steel cross section is greater than the compression that two edge produce, and the both sides position of working roll to band steel applies additional compression.At this moment, be greater than edge in the middle part of the compression that band steel cross section produces, thus for steel edge portion by additional for generation compression instead of tension.
Preferably, in the process of minimizing mill star-up broken belt of the present invention, the additional potential stress of steel two edge is with to implement to improve by the thickness increasing roll gap region bands steel cross section with minimizing.
Adopt method of the present invention, bring obvious benefit.Be exemplified below:
Band steel again threading is about 50m, calculates: (steel density p=7.8g/cm with average size 0.8*1250mm
3)
V＝0.8*1250*50000＝50000cm
3
m＝7.8*50000＝390㎏
This type of threading average monthly about 30 times: M=390*30=11700 ㎏
Certified products can be produced every year: 11700*12=140400 ㎏ more
Monthly can reduce about 16, broken belt roll marks abnormal off-line roll, a roll is worth 120,000 yuan, and every grinding 1mm is worth 3000 yuan, and general abnormal off-line roll often overlaps average cut amount and is about 0.8mm
Annual roll loss of at least saving: 0.8*8*3000*12=230400 unit
The process of minimizing mill star-up broken belt of the present invention, can solve when mill star-up and start the generation of broken belt accident, thus improve unit lumber recovery, reduces abnormal off-line roll quantity.Can improve lumber recovery by reducing startup broken belt frequency, the abnormal off-line roll quantity caused because of broken belt obviously reduces.
Above by reference to the accompanying drawings to invention has been exemplary description; the concrete realization of obvious the present invention is not subject to the restrictions described above; as long as have employed the various improvement that method of the present invention is conceived and technical scheme is carried out; or design of the present invention and technical scheme directly applied to other occasions, all in protection scope of the present invention without to improve.
Claims (4)
1. reduce a process for mill star-up broken belt, described milling train comprises frame, working roll, and control assembly is characterized in that: the step of the process of described minimizing mill star-up broken belt is:
(1), before the milling train described in is shut down, the target thickness of band steel exports portion setting is increased by 30%-40%;
(2) after increasing target thickness numerical value, and each frame applying positive bending roller force is on the work rolls reduced;
(3), after being with the thickness in steel exports portion to increase, weld seam is sheared rear milling train by milling train and is shut down;
(4) before milling train starts again, target thickness is recovered, the positive bending roller force of each frame of stable rear recovery to be rolled.
2. the process of minimizing mill star-up broken belt according to claim 1; it is characterized in that: described milling train is before shutdown; operating personnel increase the target thickness of setting by control assembly; the target thickness in band steel exports portion is increased by 30%, and the actual (real) thickness of band steel that now milling train shuts out increases.
3. the process of minimizing mill star-up broken belt according to claim 1 and 2; it is characterized in that: after the thickness increase in described band steel exports portion; weld seam is sheared rear operating personnel by milling train and is controlled milling train shutdown by control assembly; before milling train starts again; band steel exports portion thickness recovers to be set to target thickness by control assembly by operating personnel again; belt steel thickness with steel exports portion returns to the numerical value of target thickness again, and milling train recovers normal work.
4. the process of minimizing mill star-up broken belt according to claim 3, it is characterized in that: when reduction frame applies positive bending roller force on the work rolls, compression with producing in the middle part of steel cross section is greater than the compression that two edge produce, and the both sides position of described working roll to band steel applies additional compression.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310108154.8A CN103191929B (en) | 2013-03-30 | 2013-03-30 | Technological method for reducing belt breaking times in rolling mill starting |
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| CN201310108154.8A CN103191929B (en) | 2013-03-30 | 2013-03-30 | Technological method for reducing belt breaking times in rolling mill starting |
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| CN103191929A CN103191929A (en) | 2013-07-10 |
| CN103191929B true CN103191929B (en) | 2015-05-13 |
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Families Citing this family (7)
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| CN103785694B (en) * | 2013-11-22 | 2016-06-01 | 首钢总公司 | The method of car broken belt is opened in prevention |
| CN104226693B (en) * | 2014-08-28 | 2016-03-02 | 首钢总公司 | Reduce the production method of cold-rolled process non-weld seam broken belt incidence |
| CN105080967B (en) * | 2015-09-29 | 2017-01-18 | 山东钢铁股份有限公司 | Secondary rolling method of broken belt roll of single-rack reversible cold rolling mill |
| CN108043883B (en) * | 2017-12-08 | 2019-11-01 | 山西太钢不锈钢股份有限公司 | A method of improving sour three roller jockey pulley weld seam percent of pass of tandem rolling high grade silicon steel |
| CN108856304A (en) * | 2018-05-02 | 2018-11-23 | 邯郸钢铁集团有限责任公司 | A method of preventing the disconnected band in strip plastic deformation area during cold rolling dynamic variable specification |
| CN110280596A (en) * | 2019-05-30 | 2019-09-27 | 邯郸钢铁集团有限责任公司 | A kind of cold rolling thin gauge strip is disconnected to open Che Fangfa with after |
| CN111346928B (en) * | 2020-03-04 | 2021-11-19 | 首钢京唐钢铁联合有限责任公司 | Start control method, device and medium for preventing strip steel from being broken under secondary pressing |
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