CN104001757A - Cold straightening process for high-strength thin plate - Google Patents
Cold straightening process for high-strength thin plate Download PDFInfo
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- CN104001757A CN104001757A CN201410221023.5A CN201410221023A CN104001757A CN 104001757 A CN104001757 A CN 104001757A CN 201410221023 A CN201410221023 A CN 201410221023A CN 104001757 A CN104001757 A CN 104001757A
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Abstract
The invention discloses a straightening process for a high-strength thin plate. The problem that the head of a steel plate collides with a straightening roll when the steel plate is bit in the large-rolling-reduction straightening process is avoided by adopting the method of firstly biting steel plate and then arranging roll bites. The problem that the steel plate cannot come in due to overlarge head-tail warpage amount in the subsequent straightening process is solved by positioning the head and tail of the steel plate in the straightening process. The straightness of the steel plate is improved through the straightening process of arranging the multi-pass progressive-decreasing type roll bits, and meanwhile the distribution of the internal stress of the steel plate is more uniform.
Description
Technical field
The invention belongs to steel rolling field, relate to a kind of cold leveling technique of thin size high-tensile plate.
Background technology
The use of thin size high-tensile plate (steel plate thickness is less than 6mm, and yield strength is greater than 1000MPa) in machine-building process, not only can realize the lightweight of product, and can be under the prerequisite that meets requirement of strength the use amount of saving steel.But the production difficulty of thin size high-tensile plate is larger: first, in the performance of thin size high-tensile plate to milling train and the operation of rolling, the control accuracy of strip crown is had relatively high expectations; In addition, the steel plate that rolling finishes is easy to occur wooden dipper song in heat treatment process subsequently.Therefore, final strip shape quality mainly relies on the aligning of cold straightener.
The bent steel plate of wooden dipper, in aligning process, by the amount of plastic deformation of middle top and bottom certain depth, makes the curvature of steel plate diverse location be tending towards close, reaches the object that steel plate flatness improves.Thin size high-tensile plate is in rolling and later stage heat treatment process, be subject to various factors, than the steel plate of thick specification, wooden dipper song more easily occurs, and the bent amount of wooden dipper is larger, the bent type of wooden dipper is more, cause aligning difficulty higher, need larger amount of plastic deformation just can reach desirable leveling effect.The amount of plastic deformation of aligning process light plate is not only relevant with the configuration of straightener, stronger relevant with thickness with the surrender of steel plate itself, want to realize identical amount of plastic deformation, yield strength is higher, the needed aligning drafts of steel plate that thickness is thinner is larger, but thin size high-tensile plate there will be problems in heavy reduction aligning process: first, after entrance roll gap is reduced to a certain degree, the bending and deformation of head amount of steel plate is excessive, the guide plate process light plate head impact working roll (as shown in Fig. 1 (a)) of nipping, cause steel plate head to wound, work roll surface is impaired, secondly, after a time heavy reduction aligning, the amount of warpage end to end of steel plate is larger, causes oppositely in aligning process, being difficult to enter straightener, causes aligning to interrupt (as shown in Fig. 1 (b)), again, steel plate after a time heavy reduction aligning, higher to surperficial amount of plastic deformation variable gradient from thickness of slab central authorities, the internal stress skewness of steel plate after aligning, cause the smooth steel plate of aligning, in later stage cutting use procedure, wooden dipper song again occurs, bring use obstacle to client.
Summary of the invention
In order to overcome the problem of prior art existence, the object of this invention is to provide a kind of straightening process of thin size high-tensile plate, adopt this technique can align intensity and be less than 1200MPa, thickness is greater than the steel plate of 4mm.By taking first to nip steel plate, the method that rear roll gap arranges, the steel plate problem of head impact smoothing roll in process of nipping while having avoided heavy reduction aligning; By to the positioning end to end of aligning process light plate, solve in follow-up aligning process, because of the too high unapproachable problem of steel plate that causes of amount of warpage end to end; And by the straightening process of multi-pass degression type roll gap setting, improved the glacing flatness of steel plate, make the internal stress of steel plate distribute more even simultaneously.
Object of the present invention is achieved through the following technical solutions:
A cold leveling technique for thin size high-tensile plate, is characterized in that: this technology utilization steel plate locate end to end guarantee steel plate normally nip aligning and direction align, realize heavy reduction multi-pass roll gap degression type straightening process, concrete steps are as follows:
(1), in advance straightener roll gap is opened, utilize entrance side rollgang that steel plate transmission to be aligned is entered to straightener, utilize the photoelectric tube of entrance side to position steel plate head, in the time that steel plate head arrives No. 3 between No. 4 bottom working rolls, roller-way stops, then, entrance roll gap is implemented heavy reduction setting, and outlet side roll gap is set to steel plate thickness;
(2), intermesh determination is after desired value, start the first passage aligning, and utilize the photoelectric tube of entrance side to position steel plate afterbody, when afterbody roller-way between No. 2 and No. 3 bottom working rolls time stops, then, outlet side roll gap is implemented to heavy reduction setting, and entrance side roll gap is set to steel plate thickness;
(3), intermesh determination is after desired value, start the second passage aligning, and utilize the photoelectric tube of outlet side to position steel plate head, when head roller-way between No. 3 and No. 4 bottom working rolls time stops, then, entrance side roll gap is implemented to medium drafts setting, and outlet side roll gap is set to steel plate thickness;
(4), intermesh determination is after desired value, start the 3rd passage aligning, and utilize the photoelectric tube of outlet side to position steel plate afterbody, until the afterbody of steel plate roller-way when the photoelectric tube stops, then, outlet side roll gap is implemented to light reduction setting, and entrance side roll gap is set to steel plate thickness;
(5), intermesh determination after desired value, start the aligning of four-pass, aligning finishes the glacing flatness of rear detection steel plate, completes the cold leveling of thin size high-tensile plate.
In the present invention, while utilizing the photoelectric tube of entrance side to position steel plate head, through photoelectric tube, utilize roller table speed and time to obtain the position of steel plate head from steel plate head.While utilizing the photoelectric tube of entrance side to position steel plate afterbody, through photoelectric tube, utilize roller table speed and time to obtain the position of steel plate afterbody from steel plate afterbody.
Described heavy reduction refers to steel plate amount of plastic deformation (P): P > 85%, wherein, (P) is steel plate drafts, and P is that steel plate is depressed front thickness; Medium drafts refers to the amount of plastic deformation (P) of steel plate: 70≤P≤85%; Light reduction refers to the amount of plastic deformation (P) of steel plate: P < 70%.
Beneficial effect of the present invention is as follows:
The present invention first delivers into straightener by steel plate by adopting, the method for rear setting roll gap, the problem of having avoided steel plate to bump at heavy reduction aligning process light plate head and working roller of straightening machine; Locate end to end tracking by the straightening plate to after weight, make steel plate carry out straightener roll gap before not completely by straightener and oppositely arrange, solved straightening plate after weight causes carrying out follow-up aligning problem because afterbody warpage is too high; Above two kinds of measures have ensured that multi-pass degression type smoothing roll seams the smooth enforcement of putting technique, and this straightening process had both improved the glacing flatness of steel plate, make again the internal stress of steel plate distribute more even.
The present invention has successfully solved thin size high-tensile plate and has been difficult to carry out the problem of heavy reduction cold leveling, has increased substantially the aligning qualification rate of thin size high-tensile plate, makes to align rear steel plate internal stress simultaneously and distributes more even.Adopt this technique can align intensity and be less than 1200MPa, thickness is greater than the steel plate of 4mm.
Brief description of the drawings
Fig. 1 (a) is the nip schematic diagram of process light plate head impact working roll of prior art.
Fig. 1 (b) is that the amount of warpage end to end of prior art light plate is large, causes being difficult to enter in reverse aligning process the schematic diagram of straightener.
Fig. 2 (a)-Fig. 2 (h) is schematic diagram of the present invention.
Mark in figure: 11-straightener, 12-steel plate, 13-entrance side photoelectric tube, 14-outlet side photoelectric tube, 1-1 bottom working roll, 2-2 bottom working roll, 3-3 bottom working roll, 4-4 bottom working roll, 5-5 bottom working roll.
Detailed description of the invention
A kind of 5mm yield strength is the straightening process of 1200MPa abrasion-resistant stee, straightener roller footpath and roll spacing that this technique is used are respectively 180mm and 240mm, this technological requirement is carried out four-pass aligning (twice weight, middle pressure together, together light pressure), weight entrance roll gap is-30mm, outlet roll gap is 5mm, in be pressed into mouthful roll gap for-18mm, outlet roll gap is 5mm, gently being pressed into mouthful roll gap is-9mm that outlet roll gap is 5mm; Weight is nipped to adopt in process and is first driven the method for roll gap setting after steel plate into and prevent that steel plate head and working roll from producing collision; After weight aligning, adopt steel plate afterbody track and localization, prevent that steel plate afterbody from leaving straightener and causing causing reverse aligning to nip because steel plate afterbody warpage is overweight, realized the logical plate heavy reduction aligning of steel plate; After aligning, the logical strip flatness of steel plate is less than 3mm/2m.
The present embodiment selects 1 block of 5mm abrasion-resistant stee for aligning object, plate size is 5*3200*10000mm, yield strength is 1200MPa, the maximum glacing flatness of aligning front spring is 20mm/2m, after aligning, the logical plate of the glacing flatness of steel plate is less than 3mm/2m, align four passages, the first two passage is used weight, and (entrance roll gap is-30mm, outlet roll gap is 5mm), during the 3rd passage adopts, (entrance roll gap is-18mm pressure, outlet roll gap is 5mm), four-pass adopts light press (entrance roll gap is-9mm that outlet roll gap is 5mm).Detailed process is as follows, sees Fig. 2:
(1), in advance straightener roll gap is opened, utilize entrance side rollgang that steel plate transmission to be aligned is entered to straightener, utilize the photoelectric tube of entrance side to position steel plate head, from steel plate head process photoelectric tube, utilize the position of roller table speed and Time Calculation steel plate head, in the time that steel plate head arrives No. 3 between No. 4 bottom working rolls, roller-way stops (as Fig. 2 (a)), then carry out roll gap setting, enter be set to-30mm of side mouth roll gap, outlet side is set to 5mm(as Fig. 2 (b)).
(2), intermesh determination is after desired value, start the first passage aligning, and utilize the photoelectric tube of entrance side to position steel plate afterbody, from steel plate afterbody process photoelectric tube, utilize the position of roller table speed and Time Calculation steel plate afterbody, when afterbody roller-way between No. 2 and No. 3 bottom working rolls time stops (as Fig. 2 (c)), then carry out roll gap setting, entrance side roll gap is set to 5mm, and be set to-30mm(of outlet side roll gap is as Fig. 2 (d)).
(3), intermesh determination is after desired value, start the second passage aligning, and utilize the photoelectric tube of outlet side to position steel plate head, from steel plate head process photoelectric tube, utilize the position of roller table speed and Time Calculation steel plate head, when head roller-way between No. 3 and No. 4 bottom working rolls time stops (as Fig. 2 (e)), then carry out roll gap setting, be set to-18mm of entrance side roll gap, outlet side roll gap is set to 5mm(as Fig. 2 (f)).
(4), intermesh determination is after desired value, start the 3rd passage aligning, and utilize the photoelectric tube of outlet side to position steel plate afterbody, until the afterbody of steel plate roller-way when the photoelectric tube stops (as Fig. 2 (g)), then carry out roll gap setting, outlet side seams and is set to-9mm, and entrance side roll gap is set to 5mm(as Fig. 2 (h)).
(5), intermesh determination after desired value, start the aligning of four-pass, aligning finishes the glacing flatness of rear detection steel plate, maximum glacing flatness is less than 3mm/2m.。
The present invention has increased substantially the aligning qualification rate of thin size high-tensile plate, has both improved the glacing flatness of steel plate, makes to align rear steel plate internal stress simultaneously and distributes more even.
Claims (4)
1. a cold leveling technique for thin size high-tensile plate, is characterized in that: this technology utilization steel plate locate end to end guarantee steel plate normally nip aligning and direction align, realize heavy reduction multi-pass roll gap degression type straightening process, concrete steps are as follows:
(1), in advance straightener roll gap is opened, utilize entrance side rollgang that steel plate transmission to be aligned is entered to straightener, utilize the photoelectric tube of entrance side to position steel plate head, in the time that steel plate head arrives No. 3 between No. 4 bottom working rolls, roller-way stops, then, entrance roll gap is implemented heavy reduction setting, and outlet side roll gap is set to steel plate thickness;
(2), intermesh determination is after desired value, start the first passage aligning, and utilize the photoelectric tube of entrance side to position steel plate afterbody, when afterbody roller-way between No. 2 and No. 3 bottom working rolls time stops, then, outlet side roll gap is implemented to heavy reduction setting, and entrance side roll gap is set to steel plate thickness;
(3), intermesh determination is after desired value, start the second passage aligning, and utilize the photoelectric tube of outlet side to position steel plate head, when head roller-way between No. 3 and No. 4 bottom working rolls time stops, then, entrance side roll gap is implemented to medium drafts setting, and outlet side roll gap is set to steel plate thickness;
(4), intermesh determination is after desired value, start the 3rd passage aligning, and utilize the photoelectric tube of outlet side to position steel plate afterbody, until the afterbody of steel plate roller-way when the photoelectric tube stops, then, outlet side roll gap is implemented to light reduction setting, and entrance side roll gap is set to steel plate thickness;
(5), intermesh determination after desired value, start the aligning of four-pass, aligning finishes the glacing flatness of rear detection steel plate, completes the cold leveling of thin size high-tensile plate.
2. the cold leveling technique of thin size high-tensile plate according to claim 1, it is characterized in that: in step (1), while utilizing the photoelectric tube of entrance side to position steel plate head, through photoelectric tube, utilize roller table speed and time to obtain the position of steel plate head from steel plate head.
3. the cold leveling technique of thin size high-tensile plate according to claim 1, it is characterized in that: in step (2), while utilizing the photoelectric tube of entrance side to position steel plate afterbody, through photoelectric tube, utilize roller table speed and time to obtain the position of steel plate afterbody from steel plate afterbody.
4. the cold leveling technique of thin size high-tensile plate according to claim 1, is characterized in that: described heavy reduction refers to steel plate amount of plastic deformation > 85%; Medium drafts refers to that the amount of plastic deformation of steel plate is more than or equal to 70%, is less than or equal to 85%; Light reduction refers to the amount of plastic deformation < 70% of steel plate.
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| CN201410221023.5A CN104001757A (en) | 2014-05-23 | 2014-05-23 | Cold straightening process for high-strength thin plate |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105080969A (en) * | 2015-08-25 | 2015-11-25 | 南京钢铁股份有限公司 | Plate overlapping straightening process for waved surfaces on two sides of ultra-thin middle-thick plate |
| CN105107873A (en) * | 2015-09-06 | 2015-12-02 | 南京钢铁股份有限公司 | Cold straightening process for improving straightening capability through reduction of number of working rolls of straightener |
| CN106890852A (en) * | 2015-12-21 | 2017-06-27 | 宝山钢铁股份有限公司 | Reduce the method that finishing mill stings steel impact |
| CN106903186A (en) * | 2015-12-22 | 2017-06-30 | 宝山钢铁股份有限公司 | cold straightener with nose protection |
| CN107282696A (en) * | 2016-04-04 | 2017-10-24 | 鞍钢股份有限公司 | Straightening method for steel plate with serious bad plate shape |
| CN111069344A (en) * | 2019-12-30 | 2020-04-28 | 昆山全亚冠环保科技有限公司 | Precise straightening process for target backing plate |
| CN112845673A (en) * | 2021-01-06 | 2021-05-28 | 广东韶钢松山股份有限公司 | Steel plate hot straightening method |
| CN113172121A (en) * | 2021-05-14 | 2021-07-27 | 宝武集团鄂城钢铁有限公司 | Straightening method for solving steel plate knocking problem in TMCP (thermal mechanical control processing) process |
| JP2022027454A (en) * | 2020-07-29 | 2022-02-10 | Ｊｆｅスチール株式会社 | Steel plate correction position calculation method and steel plate manufacturing method |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105080969A (en) * | 2015-08-25 | 2015-11-25 | 南京钢铁股份有限公司 | Plate overlapping straightening process for waved surfaces on two sides of ultra-thin middle-thick plate |
| CN105107873A (en) * | 2015-09-06 | 2015-12-02 | 南京钢铁股份有限公司 | Cold straightening process for improving straightening capability through reduction of number of working rolls of straightener |
| CN105107873B (en) * | 2015-09-06 | 2017-03-22 | 南京钢铁股份有限公司 | Cold straightening process for improving straightening capability through reduction of number of working rolls of straightener |
| CN106890852A (en) * | 2015-12-21 | 2017-06-27 | 宝山钢铁股份有限公司 | Reduce the method that finishing mill stings steel impact |
| CN106903186A (en) * | 2015-12-22 | 2017-06-30 | 宝山钢铁股份有限公司 | cold straightener with nose protection |
| CN107282696A (en) * | 2016-04-04 | 2017-10-24 | 鞍钢股份有限公司 | Straightening method for steel plate with serious bad plate shape |
| CN111069344A (en) * | 2019-12-30 | 2020-04-28 | 昆山全亚冠环保科技有限公司 | Precise straightening process for target backing plate |
| JP2022027454A (en) * | 2020-07-29 | 2022-02-10 | Ｊｆｅスチール株式会社 | Steel plate correction position calculation method and steel plate manufacturing method |
| JP7207448B2 (en) | 2020-07-29 | 2023-01-18 | Ｊｆｅスチール株式会社 | Method for calculating corrected position of steel plate and method for manufacturing steel plate |
| CN112845673A (en) * | 2021-01-06 | 2021-05-28 | 广东韶钢松山股份有限公司 | Steel plate hot straightening method |
| CN112845673B (en) * | 2021-01-06 | 2023-03-14 | 广东韶钢松山股份有限公司 | Steel plate hot straightening method |
| CN113172121A (en) * | 2021-05-14 | 2021-07-27 | 宝武集团鄂城钢铁有限公司 | Straightening method for solving steel plate knocking problem in TMCP (thermal mechanical control processing) process |
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Application publication date: 20140827 |