CN106914495A - 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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- CN106914495A CN106914495A CN201510998118.2A CN201510998118A CN106914495A CN 106914495 A CN106914495 A CN 106914495A CN 201510998118 A CN201510998118 A CN 201510998118A CN 106914495 A CN106914495 A CN 106914495A
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- slab
- finishing mill
- hot
- camber
- width
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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
-
- 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
-
- 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
-
- 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
-
- 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
Abstract
The invention discloses a kind of hot-strip camber control method and system.Hot-strip camber control method of the present invention, in turn includes 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 roll gap wedge shape compensation rate Δ S, the gap values between rollers to the finishing mill are controlled.Hot-strip camber control method and system that the present invention is provided, contrast prior art, reduce rolling sideslip steel scrap, improve the stability of hot rolling and the strip shape quality of belt steel product, while great amount of investment cost is also reduced, implementation cycle and manually 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 technology
Hot-strip is important steel products, and hot continuous rolling is one of major way of hot-strip production.Fig. 1 is typical case
Hot-rolled strip production line structural representation.Its production technology is：Slab is heated in heating furnace, through high-pressure water descaling, slightly
After milling train roughing, finishing mill finish rolling, section cooling is carried out, finally complete to batch in coiling machine.By the slab after roughing
Base in the middle of also referred to as.But, in the production of actual hot-strip, often there is certain camber in middle base, as shown in Fig. 2 meeting
Follow-up finish rolling is adversely affected, rolling camber and sideslip steel scrap accident is easily caused.
In this regard, milling train is general lack of corresponding control device at present.Operative employee is needed according to actual rolling situation in production
Intervened in time, with larger uncertainty and error.With high-strength hot-rolled strip product and thin, hard specification product
It is increasing, become increasingly conspicuous the problems such as hot rolling camber, sideslip, one of focal issue as hot rolling production.
It is unequal with the slab ratio wedge shape of outlet that camber problem comes from Asymmetric Rolling, i.e. inlet of rolling mill.Cause non-
The factor of symmetry rolling is numerous, mainly including rolled piece, milling train and the aspect of rolling centering three, as there is slab supplied materials in terms of rolled piece
Camber, wedge shape degree and temperature homogeneity.
For Asymmetric Rolling problem caused by slab supplied materials temperature homogeneity, temperature is based on prior art discloses one kind
The camber and camber control method of detection, are to install temperature-detecting device by inlet of rolling mill, measure slab transverse temperature
Difference, thus obtains milling train both sides rolling force deviation and roll gap deviation, and milling train both sides roll gap is compensated, so as to realize reaping hook
Curved and camber control.But it is uncontrollable for sideslip caused by slab wedge shape and camber.
For the camber of controlled rolling process, prior art discloses a kind of camber controlling party of view-based access control model detection
Method, i.e., exported by milling train and install high speed camera, real-time detection strip position, and give rolling mill screwdown system sideslip information transmission
System, dynamic adjustment milling train both sides pressure, so as to realize camber and camber control.But the method needs to install the detection of slab position
With automatic Serve System, implement investment greatly, the cycle is long.
The content of the invention
To solve the above problems, the present invention provides a kind of hot-strip camber control method.The method includes following step
Suddenly：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 for calculating finishing mill is mended
The amount of repaying Δ S；S3. according to roll gap wedge shape compensation rate Δ S, the gap values between rollers to the finishing mill are controlled.
Further, the step S2 described in the method is further included：The roll gap wedge shape is calculated according to equation below to mend
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, the finishing mill described in the method includes n width frames, and the step S2 is further included：According to as follows
Formula, calculates the roll gap wedge shape compensation rate Δ S of frame described in every width of the finishing milli：ΔSi=-Bhiρ, i=1,
2 ..., n, wherein, B is the width of the slab in the exit of the finishing mill, hiIt is the slab in the exit of each frame
Thickness.
Further, the step S1 described in the method is further included：Any three are selected on the center line of the slab
Point, the distance between every 2 points a, b and c during detection is described 3 points calculate the curvature ρ according to equation below：
Further, the step S3 described in the method is further included：The offside of that side that the camber is bent towards
Gap values between rollers reduce | Δ S |.
Further, the step S3 described in the method is further included：The offside of that side that the camber is bent towards
Each described frame gap values between rollers reduce | Δ Si|, wherein i is the numbering of frame.
Further, the number n of frame described in the method is 5~7.
Present invention also offers a kind of hot-strip camber control system, including width measuring instrument and computer controls system
System, after the width measuring instrument is arranged on roughing mill, before finishing mill, wherein：The width measuring instrument is used for measuring roughing
The position of the center line of slab afterwards, and in real time by the location transmission of each point on the center line of the slab to the calculating
Machine control system, the computer controls are configured to：Selection is appointed in the data of the position of each point on the center line of the slab
Anticipate 3 points of position, and the distance between every 2 points a, b and c in calculating at this 3 points, and camber is calculated according to equation below
Curvature ρ：The roll gap wedge is calculated according to equation below
Shape compensation rate 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 finish rolling
The thickness of the slab in the exit of machine；The gap values between rollers of the offside of that side that the camber is bent towards reduce | Δ S |.
Further, the hot-strip camber control system also includes width measuring instrument and computer control system,
After the width measuring instrument is arranged on roughing mill, before finishing mill, the finishing mill includes n width frames, wherein：The width
Measuring instrument is used for the position of the center line for measuring the slab after roughing, and in real time by each point on the center line of the slab
Location transmission is configured to the computer control system, the computer controls：The each point on the center line of the slab
Any 3 points of position is selected in the data of position, and the distance between every 2 points a, b and c in calculating at this 3 points, and according to
Equation below calculates the curvature ρ of camber：According to as follows
The roll gap wedge shape compensation rate Δ Si of frame described in every width of the formula calculating finishing mill：ΔSi=-Bhiρ, i=1,
2 ..., n, wherein, B is the width of the slab in the exit of the finishing mill, hiIt is the slab in the exit of each frame
Thickness；The gap values between rollers of each described frame of the offside of that side that the camber is bent towards are reduced | Δ Si|, wherein i is frame
Numbering.
Hot-strip camber control method and system that the present invention is provided, contrast 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
Cycle and artificial expenditure.
Brief description of the drawings
Fig. 1 is the structural representation of typical hot-rolled strip production line；
Fig. 2 is the schematic diagram of the camber of slab；
Fig. 3 is the schematic flow sheet 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 representation of hot-strip camber control system of the invention.
Specific embodiment
Below, with reference to accompanying drawing, structure of the invention and operation principle etc. are further described.
Reference picture 3, is the schematic flow sheet of hot-strip camber control method of the invention, and the method first carries out step
S1：Calculate the curvature ρ of the camber of the slab after roughing.
The computational methods of the curvature ρ of the camber of slab are：Select on the center line of slab at any 3 points, as shown in figure 4,
Point A (xA,yA), point B (xB,yB) and point C (xC,yC).In order to ensure accuracy, it is preferable that the unit of the coordinate that 3 points of A, B, C is
mm.Then by calculating at this 3 points in the distance between every 2 points a, b and c, wherein, Obtain a, b and c at the distance between every 2 points
Afterwards, curvature ρ is calculated further according to equation below：
After the curvature ρ of the camber for calculating slab, step S2 is performed：According to curvature ρ, the roll gap wedge of finishing mill is calculated
Shape compensation rate Δ S.Wherein, roll gap wedge shape compensation rate Δ S is calculated according to equation below：
Δ S=-Bh ρ,
Wherein, B is the width of the slab in the exit of finishing mill, and unit is mm, and h is the slab in the exit of finishing mill
Thickness, unit is mm.
Usual finishing mill includes n width frames, and n is usually 5~7, therefore, roll gap wedge shape compensation rate Δ S can also be for each
Individual frame is controlled respectively, i.e., the roll gap wedge shape compensation rate Δ S of every width frameiFor：
ΔSi=-Bhiρ,
Wherein, i=1,2 ..., n are the numbering of frame, and B is the width of the slab in the exit of finishing mill, and unit is mm,
hiTo number the thickness of the slab in the exit of the frame for being i, unit is mm.
After execution of step S2, step S3 is continued executing with, according to roll gap wedge shape compensation rate Δ S, to the finishing mill
Gap values between rollers are controlled, will the gap values between rollers of the offside of that side that bend towards of camber reduce | Δ S |.When the roller to each frame
When seam is controlled respectively, the gap values between rollers of the offside of that side that can be bent towards camber in each frame are reduced | Δ Si|,
Wherein i is the numbering of frame.
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, thickness is 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：A (1000, -7), B (2000,2), C
(3000, -4).The finishing mill includes 7 width frames, and the slab thickness in the exit of each frame is as shown in table 1.
Table 1：Each rolling mill exit thickness
Bring 3 points of coordinate value of A, B, C into formula In, in calculating at this 3 points between every 2 points
Distance be：
Unit is mm.
Then according to formulaCalculate the sickle of slab
The value of the curved curvature ρ of knife is：ρ=1.49991 × 10-5。
Then by the value of curvature ρ, the width 1250.0mm of slab and in table 1 slab thickness in the exit of each frame value
Substitute into formula Δ Si=-Bhiρ, wherein i=1,2 ..., 7, the roll gap wedge shape compensation rate Δ of each width frame can be calculated
Si.As shown in table 2：
Table 2：Each rolling mill roll gap wedge shape compensation rate
Reference picture 5, is the structural representation of hot-strip wedge shape control system of the invention, and wherein finishing mill includes n width
Frame.The system includes width measuring instrument 1 and computer control system 2.After width measuring instrument 1 is arranged on 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 to：
Any 3 points of position is selected in the data of the position of each point on the center line of received slab, and calculate
The distance between every 2 points a, b and c in this 3 points, wherein the computing formula of the distance between every 2 points a, b and c is respectively： With
And the curvature ρ of camber is calculated according to equation below：
The roll gap wedge shape compensation rate Δ S of each width frame of finishing mill is calculated further according to equation belowi：
ΔSi=-Bhiρ, wherein, i=1,2 ..., n are the numbering of each width frame, and B is the exit of finishing mill
The width of slab, unit is mm, hiTo number the thickness of the slab in the exit of the frame for being i, unit is mm；
Each width frame of the subsequent control of computer control system 2 finishing mill is compensated to the camber of slab, that is, control
The gap values between rollers of the offside of that side that each frame bends towards camber are reduced | Δ Si|。
Above specific embodiment is only illustrative embodiments of the invention, it is impossible to for limiting the present invention, the present invention
Protection domain be defined by the claims.Those skilled in the art can be in essence of the invention and protection domain, to this
Various modifications or equivalent are made in invention, and these modifications or equivalent also should be regarded as being within the scope of the present invention.
Claims (9)
1. a kind of hot-strip camber control method, the 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 roll gap wedge shape compensation rate Δ S, the gap values between rollers to the finishing mill are controlled.
2. hot-strip camber control method as claimed in claim 1, it is characterised in that the step S2 is further wrapped
Include：The roll gap wedge shape compensation rate Δ S is calculated according to equation below：
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.
3. hot-strip camber control method as claimed in claim 2, it is characterised in that the finishing mill includes n width machines
Frame, the step S2 is further included：According to equation below, the roll gap wedge shape for calculating frame 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, hiIt is the thickness of the slab in the exit of each frame.
4. hot-strip camber control method as claimed in claim 1, it is characterised in that step S1 is further included：
Select, a, b and c during detection is described, according to as follows on the center line of the slab at any 3 points at 3 points at the distance between every 2 points
Formula calculates the curvature ρ：
5. hot-strip camber control method as claimed in claim 1, it is characterised in that step S3 is further included：Will
The gap values between rollers of the offside of that side that the camber bends towards reduce | Δ S |.
6. hot-strip camber control method as claimed in claim 3, it is characterised in that step S3 is further included：Will
The gap values between rollers of each described frame of the offside of that side that the camber bends towards are reduced | Δ Si|, wherein i is the numbering of frame.
7. hot-strip camber control method as claimed in claim 3, it is characterised in that the number n of the frame is 5~
7.
8. a kind of hot-strip camber control system, including width measuring instrument and computer control system, it is characterised in that institute
State width measuring instrument be arranged on roughing mill after, before finishing mill, wherein：
The width measuring instrument is used for the position of the center line for measuring the slab after roughing, and in real time by the slab
The location transmission of each point gives the computer control system on heart line,
The computer controls are configured to：
Any 3 points of position is selected in the data of the position of each point on the center line of the slab, and in calculating at this 3 points between every 2 points
Apart from a, b and c, and the curvature ρ that camber is calculated according to equation below：
The roll gap wedge shape compensation rate Δ S is calculated according to equation below：Δ S=-Bh ρ, wherein, B is the finishing mill
The width of the slab in exit, h is the thickness of the slab in the exit of the finishing mill；
The gap values between rollers of the offside of that side that the camber is bent towards reduce | Δ S |.
9. a kind of hot-strip camber control system, including width measuring instrument and computer control system, it is characterised in that institute
State width measuring instrument be arranged on roughing mill after, before finishing mill, the finishing mill includes n width frames, wherein：
The width measuring instrument is used for the position of the center line for measuring the slab after roughing, and in real time by the slab
The location transmission of each point gives the computer control system on heart line,
The computer controls are configured to：
Any 3 points of position is selected in the data of the position of each point on the center line of the slab, and in calculating at this 3 points between every 2 points
Apart from a, b and c, and the curvature ρ that camber is calculated according to equation below：
The roll gap wedge shape compensation rate Δ S of frame according to every width that equation below calculates the finishing milli：ΔSi=-B
hiρ, i=1,2 ..., n, wherein, B is the width of the slab in the exit of the finishing mill, hiIt is the outlet of each frame
The thickness of the slab at place；
The gap values between rollers of each described frame of the offside of that side that the camber is bent towards are reduced | Δ Si|, wherein i is frame
Numbering.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108500067A (en) * | 2018-04-11 | 2018-09-07 | 攀钢集团攀枝花钢钒有限公司 | The plate shape method of adjustment of hot-continuous-rolling strip steel |
| CN109425329A (en) * | 2017-08-30 | 2019-03-05 | 宝山钢铁股份有限公司 | The detection method of slab sideslip offset in heating furnace |
| CN111702007A (en) * | 2020-06-24 | 2020-09-25 | 河北工程大学 | Hot rolling finishing mill group strip steel head deviation control method |
| CN112439793A (en) * | 2019-08-29 | 2021-03-05 | 宝山钢铁股份有限公司 | Camber control method based on analysis of deviation of center line of plate blank |
| CN113857249A (en) * | 2021-09-14 | 2021-12-31 | 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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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109425329A (en) * | 2017-08-30 | 2019-03-05 | 宝山钢铁股份有限公司 | The detection method of slab sideslip offset in heating furnace |
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| CN111702007A (en) * | 2020-06-24 | 2020-09-25 | 河北工程大学 | Hot rolling finishing mill group strip steel head deviation control method |
| CN113857249A (en) * | 2021-09-14 | 2021-12-31 | 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 |
| 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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