CN106914495B - A kind of hot-strip camber control method and system - Google Patents
A kind of hot-strip camber control method and system Download PDFInfo
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- CN106914495B CN106914495B CN201510998118.2A CN201510998118A CN106914495B CN 106914495 B CN106914495 B CN 106914495B CN 201510998118 A CN201510998118 A CN 201510998118A CN 106914495 B CN106914495 B CN 106914495B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/68—Camber or steering control for strip, sheets or plates, e.g. preventing meandering
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/02—Transverse dimensions
- B21B2261/04—Thickness, gauge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/02—Transverse dimensions
- B21B2261/06—Width
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
Abstract
The invention discloses a kind of hot-strip camber control method and systems.Hot-strip camber control method of the present invention, in turn includes the following steps: S1. calculates the curvature ρ of the camber of the slab after roughing；S2. according to the curvature ρ, the roll gap wedge shape compensation rate Δ S of finishing mill is calculated；S3. according to the roll gap wedge shape compensation rate Δ S, the gap values between rollers of the finishing mill are controlled.Hot-strip camber control method and system provided by the invention compare the prior art, reduce rolling sideslip steel scrap, improve the stability of hot rolling and the strip shape quality of belt steel product, while also reducing great amount of investment cost, implementation cycle and artificial expenditure.
Description
Technical field
The present invention relates to hot-strip production technical field more particularly to a kind of hot-strip camber control method and it is
System.
Background technique
Hot-strip is important steel products, and hot continuous rolling is one of the major way of hot-strip production.Fig. 1 is typical case
Hot-rolled strip production line structural schematic diagram.Its production technology are as follows: slab heats in heating furnace, through high-pressure water descaling, slightly
After milling train roughing, finishing mill finish rolling, section cooling is carried out, finally completes to batch in coiling machine.Slab after roughing
Also referred to as intermediate base.But in the production of practical hot-strip, often there is certain camber in intermediate base, as shown in Fig. 2, meeting
Subsequent finish rolling is adversely affected, rolling camber and sideslip steel scrap accident are easy to cause.
In this regard, milling train is general lack of corresponding control means at present.Operative employee needs to roll situation according to practical in production
Intervened in time, there is biggish uncertain and error.With high-strength hot-rolled strip product and thin, hard specification product
It is increasing, the problems such as hot rolling camber, sideslip, becomes increasingly conspicuous, and becomes one of the focal issue of hot rolling production.
Camber problem is derived from Asymmetric Rolling, i.e. the slab ratio wedge shape of inlet of rolling mill and outlet is unequal.It causes non-
The factor of symmetry rolling is numerous, mainly includes rolled piece, milling train and rolling to neutral tripartite face, as there is slab supplied materials in terms of rolled piece
Camber, wedge shape degree and temperature uniformity.
For Asymmetric Rolling problem caused by slab supplied materials temperature uniformity, prior art discloses one kind to be based on temperature
The camber and camber control method of detection are to measure slab transverse temperature by installing temperature-detecting device in inlet of rolling mill
Thus difference obtains milling train two sides rolling force deviation and roll gap deviation, and compensates to milling train two sides roll gap, to realize reaping hook
Curved and camber control.But sideslip caused by slab wedge shape and camber are unable to control.
For the camber of controlled rolling process, prior art discloses a kind of camber controlling parties of view-based access control model detection
Method exports installation high speed camera, real-time detection strip position by milling train, and sideslip information is passed to rolling mill screwdown system
System, dynamic adjusts the pressure of milling train two sides, to realize camber and camber control.But this method needs to install slab position detection
With automatic Serve System, implement investment greatly, the period is long.
Summary of the invention
To solve the above problems, the present invention provides a kind of hot-strip camber control method.This method includes following step
Rapid: S1. calculates the curvature ρ of the camber of the slab after roughing；S2. according to the curvature ρ, the roll gap wedge shape for calculating finishing mill is mended
The amount of repaying Δ S；S3. according to the roll gap wedge shape compensation rate Δ S, the gap values between rollers of the finishing mill are controlled.
Further, step S2 described in this method further comprises: calculating the roll gap wedge shape according to the following formula and mends
The amount of repaying Δ S, Δ S=-Bh ρ, wherein B is the width of the slab in the exit of the finishing mill, and h is the finishing mill
The thickness of the slab in exit.
Further, finishing mill described in this method includes n width rack, and the step S2 further comprises: according to as follows
Formula calculates the roll gap wedge shape compensation rate Δ S of rack described in every width of the finishing milli: Δ Si=-Bhiρ, i=1,
2 ..., n, wherein B is the width of the slab in the exit of the finishing mill, hiFor the slab in the exit of each rack
Thickness.
Further, step S1 described in this method further comprises: any three are selected on the center line of the slab
Point detects the distance between every two o'clock a, b and c in described 3 points, calculates the curvature ρ according to the following formula:
Further, step S3 described in this method further comprises: the opposite side for that side that the camber is bent towards
Gap values between rollers reduce | Δ S |.
Further, step S3 described in this method further comprises: the opposite side for that side that the camber is bent towards
Each rack gap values between rollers reduce | Δ Si|, wherein i is the number of rack.
Further, the number n of rack described in this method is 5~7.
The present invention also provides a kind of hot-strip camber control systems, including width measuring instrument and computer control system
System, the width measuring instrument are arranged after roughing mill, before finishing mill, in which: the width measuring instrument is used to measure roughing
The position of the center line of slab later, and give the location transmission of each point on the center line of the slab to the calculating in real time
Machine control system, the computer control are configured that on the center line of the slab in the data of the position of each point that selection is appointed
It anticipates 3 points of position, and calculates the distance between every two o'clock a, b and c in this 3 points, and calculate camber according to the following formula
Curvature ρ:The roll gap wedge is calculated according to the following formula
S: Δ S=-Bh ρ of shape compensation rate Δ, wherein B is the width of the slab in the exit of the finishing mill, and h is the finish rolling
The thickness of the slab in the exit of machine；The gap values between rollers of the opposite side for that side that the camber is bent towards are reduced | Δ S |.
Further, the hot-strip camber control system further includes width measuring instrument and computer control system,
The width measuring instrument is arranged after roughing mill, before finishing mill, and the finishing mill includes n width rack, in which: the width
Measuring instrument is used to measure the position of the center line of the slab after roughing, and in real time by each point on the center line of the slab
Location transmission gives the computer control system, and the computer control is configured that each point on the center line of the slab
Any 3 points of position is selected in the data of position, and calculates the distance between every two o'clock a, b and c in this 3 points, and according to
Following formula calculates the curvature ρ of camber:According to as follows
Formula calculates roll gap wedge shape compensation rate Δ Si: Δ S of rack described in every width of the finishing milli=-Bhiρ, i=1,
2 ..., n, wherein B is the width of the slab in the exit of the finishing mill, hiFor the slab in the exit of each rack
Thickness；The gap values between rollers of each rack of the opposite side for that side that the camber is bent towards are reduced | Δ Si|, wherein i is rack
Number.
Hot-strip camber control method and system provided by the invention compare the prior art, reduce rolling sideslip
Steel scrap improves the stability of hot rolling and the strip shape quality of belt steel product, while also reducing great amount of investment cost, implements
Period and artificial expenditure.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of typical hot-rolled strip production line；
Fig. 2 is the schematic diagram of the camber of slab；
Fig. 3 is the flow diagram of hot-strip camber control method of the invention；
Fig. 4 is that any 3 points of coordinate shows on the center line of the slab of hot-strip camber control method of the invention
It is intended to；
Fig. 5 is the structural schematic diagram of hot-strip camber control system of the invention.
Specific embodiment
In the following, being further described in conjunction with attached drawing to structure and working principle etc. of the invention.
It is the flow diagram of hot-strip camber control method of the invention referring to Fig. 3, this method first carries out step
S1: the curvature ρ of the camber of the slab after calculating roughing.
The calculation method of the curvature ρ of the camber of slab are as follows: select on the center line of slab at any 3 points, such as Fig. 4 institute
Show, point A (xA,yA), point B (xB,yB) and point C (xC,yC).In order to guarantee accuracy, it is preferable that the list for the coordinate that 3 points of A, B, C
Position is mm.Then by calculating the distance between every two o'clock a, b and c in this 3 points, wherein?
To after the distance between every two o'clock a, b and c, curvature ρ is calculated further according to following formula:
After the curvature ρ of the camber of slab is calculated, executes step S2: according to curvature ρ, calculating the roll gap wedge of finishing mill
Shape compensation rate Δ S.Wherein, roll gap wedge shape compensation rate Δ S is calculated according to the following formula:
Δ S=-Bh ρ,
Wherein, B is the width of the slab in the exit of finishing mill, and unit mm, h are the slab in the exit of finishing mill
Thickness, unit mm.
Usual finishing mill includes n width rack, and n is usually 5~7, and therefore, roll gap wedge shape compensation rate Δ S can also be for each
A rack is controlled respectively, i.e., the roll gap wedge shape compensation rate Δ S of every width rackiAre as follows:
ΔSi=-Bhiρ,
Wherein, the number of i=1,2 ..., n for rack, width of the B for the slab in the exit of finishing mill, unit mm,
hiFor number be i rack exit slab thickness, unit mm.
After executing the step S2, step S3 is continued to execute, according to roll gap wedge shape compensation rate Δ S, to the finishing mill
Gap values between rollers are controlled, i.e., the gap values between rollers of the opposite side of that side bent towards camber are reduced | Δ S |.When the roller to each rack
When seam is controlled respectively, the gap values between rollers of the opposite side for that side that camber is bent towards in each rack can be reduced | Δ Si|,
Wherein i is the number of rack.
Hot-strip camber control method of the invention is described in detail below in conjunction with specific embodiment.
In the production process of hot-rolled product, the width of slab is 1250.0mm, with a thickness of 38.0mm.By width measuring instrument
Measured data obtain the coordinate of any 3 points A, B, C on the center line of slab and be respectively as follows: A (1000, -7), B (2000,2), C
(3000, -4).The finishing mill includes 7 width racks, and the slab thickness in the exit of each rack is as shown in table 1.
Table 1: each rolling mill exit thickness
Bring 3 points of coordinate value of A, B, C into formulaIn, it calculates in this 3 points between every two o'clock
Distance are as follows:
Unit is mm.
Then according to formulaCalculate the sickle of slab
The value of the curved curvature ρ of knife are as follows: ρ=1.49991 × 10-5。
Then by the value of curvature ρ, slab width 1250.0mm and table 1 in each rack exit slab thickness value
Substitute into formula Δ Si=-Bhiρ, wherein i=1,2 ..., 7, can calculate the roll gap wedge shape compensation rate Δ of each width rack
Si.It is as shown in table 2:
Table 2: each rolling mill roll gap wedge shape compensation rate
It is the structural schematic diagram of hot-strip wedge shape control system of the invention, wherein finishing mill includes n width referring to Fig. 5
Rack.The system includes width measuring instrument 1 and computer control system 2.Width measuring instrument 1 is arranged after roughing mill, finish rolling
Before machine.
After strip is by roughing, width measuring instrument 1 measures the position of the center line of slab at the setting, and in real time
Ground is by the location transmission of each point on the center line of slab to computer control system 2.
Computer control system 2 is configured that
Any 3 points of position is selected in the data of the position of each point on the center line of received slab, and is calculated
The distance between every two o'clock a, b and c in this 3 points, wherein the calculation formula of the distance between every two o'clock a, b and c are respectively as follows:With
And the curvature ρ of camber is calculated according to the following formula:
The roll gap wedge shape compensation rate Δ S of each width rack of finishing mill is calculated further according to following formulai:
ΔSi=-Bhiρ, wherein i=1,2 ..., n are the number of each width rack, and B is the exit of finishing mill
The width of slab, unit mm, hiFor number be i rack exit slab thickness, unit mm；
Each width rack that subsequent computer control system 2 controls finishing mill compensates the camber of slab, that is, controls
The gap values between rollers of the opposite side for that side that each rack bends towards camber are reduced | Δ Si|。
The above specific embodiment is only exemplary embodiments of the present invention, it is impossible to be used in limits the present invention, the present invention
Protection scope be defined by the claims.Those skilled in the art can within the spirit and scope of the present invention, to this
Various modifications or equivalent replacements are made in invention, these modifications or equivalent replacement also should be regarded as being within the scope of the present invention.
Claims (8)
1. a kind of hot-strip camber control method, this method comprises the following steps:
S1. the curvature ρ of the camber of the slab after roughing is calculated；
S2. according to the curvature ρ, the roll gap wedge shape compensation rate Δ S of finishing mill is calculated；
S3. according to the roll gap wedge shape compensation rate Δ S, the gap values between rollers of the finishing mill are controlled；The step S2 is into one
Step includes: to calculate the roll gap wedge shape compensation rate Δ S according to the following formula:
Δ S=-Bh ρ,
Wherein, B is the width of the slab in the exit of the finishing mill, and h is the thickness of the slab in the exit of the finishing mill.
2. hot-strip camber control method as described in claim 1, which is characterized in that the finishing mill includes n width machine
Frame, the step S2 further comprises: according to the following formula, the roll gap wedge shape for calculating rack described in every width of the finishing mill is mended
The amount of repaying Δ Si:
ΔSi=-Bhiρ, i=1,2 ..., n,
Wherein, B is the width of the slab in the exit of the finishing mill, hiFor the thickness of the slab in the exit of each rack,
I is the number of rack.
3. hot-strip camber control method as described in claim 1, which is characterized in that step S1 further comprises:
It selects on the center line of the slab at any 3 points, the distance between every two o'clock a, b and c in described 3 points is detected, according to as follows
Formula calculates the curvature ρ:
4. hot-strip camber control method as described in claim 1, which is characterized in that step S3 further comprises: will
The gap values between rollers of the opposite side for that side that the camber is bent towards are reduced | Δ S |.
5. hot-strip camber control method as claimed in claim 2, which is characterized in that step S3 further comprises: will
The gap values between rollers of each rack of the opposite side for that side that the camber is bent towards are reduced | Δ Si|, wherein i is the number of rack.
6. hot-strip camber control method as claimed in claim 2, which is characterized in that the number n of the rack be 5~
7.
7. a kind of hot-strip camber control system, including width measuring instrument and computer control system, which is characterized in that institute
Width measuring instrument is stated to be arranged after roughing mill, before finishing mill, in which:
The width measuring instrument is used to measure the position of the center line of the slab after roughing, and in real time will be in the slab
The location transmission of each point gives the computer control system on heart line,
The computer control is configured that
Any 3 points of position is selected in the data of the position of each point on the center line of the slab, and is calculated every in this 3 points
The distance between two o'clock a, b and c, and the curvature ρ of camber is calculated according to the following formula:
S: Δ S=-Bh ρ of roll gap wedge shape compensation rate Δ is calculated according to the following formula, wherein B is the outlet of the finishing mill
The width of the slab at place, h are the thickness of the slab in the exit of the finishing mill；
The gap values between rollers of the opposite side for that side that the camber is bent towards are reduced | Δ S |.
8. a kind of hot-strip camber control system, including width measuring instrument and computer control system, which is characterized in that institute
It states width measuring instrument to be arranged after roughing mill, before finishing mill, the finishing mill includes n width rack, in which:
The width measuring instrument is used to measure the position of the center line of the slab after roughing, and in real time will be in the slab
The location transmission of each point gives the computer control system on heart line,
The computer control is configured that
Any 3 points of position is selected in the data of the position of each point on the center line of the slab, and is calculated every in this 3 points
The distance between two o'clock a, b and c, and the curvature ρ of camber is calculated according to the following formula:
The roll gap wedge shape compensation rate Δ S of rack described in every width of the finishing mill is calculated according to the following formulai: Δ Si=-B
hiρ, i=1,2 ..., n, wherein B is the width of the slab in the exit of the finishing mill, hiFor the outlet of each rack
The thickness of the slab at place；
The gap values between rollers of each rack of the opposite side for that side that the camber is bent towards are reduced | Δ Si|, wherein i is rack
Number.
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| CN109425329B (en) * | 2017-08-30 | 2021-08-17 | 宝山钢铁股份有限公司 | Method for detecting deviation offset of plate blank in heating furnace |
| CN108500067B (en) * | 2018-04-11 | 2020-02-04 | 攀钢集团攀枝花钢钒有限公司 | Strip shape adjusting method for hot continuous rolling strip steel |
| CN112439793B (en) * | 2019-08-29 | 2023-03-17 | 宝山钢铁股份有限公司 | Camber control method based on analysis of deviation of center line of plate blank |
| CN111702007B (en) * | 2020-06-24 | 2021-11-30 | 河北工程大学 | Hot rolling finishing mill group strip steel head deviation control method |
| CN113857249B (en) * | 2021-09-14 | 2023-04-07 | 武汉钢铁有限公司 | Manufacturing method of high-strength and high-toughness plate coil for high-precision spiral submerged-arc welding pipe |
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| CN102641903A (en) * | 2011-02-16 | 2012-08-22 | 宝山钢铁股份有限公司 | Steckel mill rolled piece head-and-tail deviation control method |
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| JPS62203611A (en) * | 1986-02-28 | 1987-09-08 | Sumitomo Metal Ind Ltd | Camera correction method |
| JPS6380908A (en) * | 1986-09-22 | 1988-04-11 | Kobe Steel Ltd | Meandering and camber control method for rolled stock |
| JPH04178209A (en) * | 1990-11-09 | 1992-06-25 | Nippon Steel Corp | Device for controlling bent of plate on hot finish rolling mill |
| JPH10235420A (en) * | 1997-02-24 | 1998-09-08 | Nisshin Steel Co Ltd | Method for controlling camber in cold rolling |
| JPH11290921A (en) * | 1998-04-09 | 1999-10-26 | Furukawa Electric Co Ltd:The | Method for controlling shape of rolled stock and device therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102641903A (en) * | 2011-02-16 | 2012-08-22 | 宝山钢铁股份有限公司 | Steckel mill rolled piece head-and-tail deviation control method |
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