CN107470375B - A kind of online recognition method of the local high concave point in strip cross section - Google Patents
A kind of online recognition method of the local high concave point in strip cross section Download PDFInfo
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Abstract
The present invention rolls field in strip, devises a kind of online recognition method of high (recessed) point in strip cross section part, the first wide thickness profile data of acquisition strip cross section full width；The thickness distribution wide with quartic polynomial and the Moving Average in n (5≤n≤15) period fitting strip cross section full width respectively；Fourth-degree polynomial curve is subtracted with Moving Average, obtains the distribution of the difference curve of thickness distribution, acquires the height and width of (recessed) point of local height by distribution of the difference curve according to certain rule；Calculating difference curve is more than the area of high (recessed) the point threshold line part in part, takes high (recessed) point height in the part at maximum area as the local high spot of strip cross section or the magnitude of local concave point.The present invention overcomes in strip calendering production due to can not high (recessed) point in online recognition part and lead to not the problem of realizing accurate evaluation and control, realize the on-line automatic identification of high (recessed) point in strip cross section part.
Description
Technical field:
The present invention relates to strips to roll field, the especially online recognition of high (recessed) point defect in strip cross section part.
Background technique:
Strip goes up the quality of cross-sectional profiles in the width direction, is usually measured by four indexs: convexity, wedge shape, side drop
With local high (recessed) point, camber, wedge shape, side drop have specific definition and unified quantitative criteria, and part is high (recessed)
Point, as shown in Figure 1, unified definition and quantitative criteria not yet.It is transversal that high (recessed) point in part is typically considered a kind of strip
Face thickness curve somewhere has the tendency that obvious protrusion (recess) compared with peripheral region, but is different from tranverse sectional thickness data small
The big ups and downs of range.Such defect has in important influence, and production the final mass of high-quality strip product
Controlling difficulties, wherein how there is also accurately identify online in actual production.Current recognition methods relies on artificial more
The thickness curve for the strip cross section that range estimation, i.e. operation or technical staff are instantaneously shown according to multi-functional instrument empirically carries out mesh
It surveys and determines.Artificial range estimation is interfered vulnerable to man-made environment (including sense of responsibility, standard, experience, state etc.), and measurement error is big, surely
Qualitative and consistency is poor, and visual observation is also not easy to recording and storage, and it is even more impossible to for regulating and controlling online.
The research of Most current scholar is concentrated mainly on the qualitative contrlol of local high (recessed) point defect, and rare scholar grinds
Study carefully the online recognition of (recessed) point of local height.High (recessed) point in part is existing various due to ununified definition and quantitative criteria
Recognition methods is all difficult to substitute artificial range estimation.Such as document 1 (strip local high spot detection method, granted patent,
CN201410175480.5 the method for the detection strip local high spot) proposed, directly in the strip cross sectional thickness of several equal parts
The middle part found continuous three dot thickness difference and reach threshold value, it is believed that be local high spot.This method not can avoid thickness data small
The unexpected big ups and downs bring error of range, false recognition rate are very high.A kind of (the strip cross-sectional outling defect local high spot of document 2
Quantization method and device, granted patent, CN201510575033.3) it proposes with six order polynomials fitting section thickness data
Method, and extreme value is asked to matched curve, it is believed that in the position of extreme point, there are local high spot defects.This method avoid documents 1
The problem of middle thickness big ups and downs are brought, but the extreme point of thickness matched curve is various, lacks and ideal thickness distribution trend
Compare, it is difficult to judge which is the part for being apparently higher than peripheral region, can not accurately determine which is local high spot defect, is also needed
By being manually determined.
High (recessed) point in part is typically considered strip cross-sectional profiles somewhere has obvious protrusion (recessed compared with peripheral region
Fall into) trend, but be different from tranverse sectional thickness data in small-scale big ups and downs (sharp tooth distribution).Therefore, it is necessary to
The recognition methods for establishing a kind of high (recessed) point in part, can remove thickness data in small-scale big ups and downs bring error,
The deviation that can consider actual cross-section thickness distribution trend and ideal distribution trend again, accurately finding out strip cross section has obvious dash forward
The position of (recess) is played, and calculates the characteristic parameter of (recessed) point of local height, realizes accurately identifying for high (recessed) point defect in part,
To determine online and regulation lays the foundation.
Summary of the invention:
The present invention provides a kind of online recognition method of high (recessed) point in strip cross section part, comprehensive design is practical to be cut
The deviation of face thickness distribution trend and ideal distribution trend, to solve not determining strip cross section in existing industrial production online
High (recessed) the point magnitude in part and bring can not evaluate, determine and the problem of control panel band cross-sectional profiles quality.
The present invention provides a kind of online recognition method of high (recessed) point in strip cross section part, and key step is as follows:
1) full width wide thickness profile data, that is, plate in strip cross section is obtained from online multi-functional instrument or control system
Corresponding thickness value after the equidistant discretization of bandwidth；
2) quartic polynomial and the Moving Average in n period is respectively adopted to the thickness of strip cross section after rejecting edge data
Degree distribution is fitted, and the value range of n is 5≤n≤15；
3) discretization is carried out to fourth-degree polynomial curve, subtracts fourth-degree polynomial curve with the Moving Average in n period, obtains
To the distribution of the difference curve of discrete strip cross section, part height or concave point are acquired by distribution of the difference curve according to certain rule
Height and width；
4) calculating difference curve is more than that part is high or the area of concave point threshold line part, take the part at maximum area high or
Concave point height is as the local high spot of strip cross section or the magnitude of local concave point.
Specific steps are as follows:
1) the wide thickness profile data of strip cross section full width, i.e. plate are obtained from online multi-functional instrument or control system
Corresponding thickness value after the equidistant discretization of bandwidth, as shown in Figure 3；
2) quartic polynomial and the Moving Average in n (5≤n≤15) period is respectively adopted to strip after rejecting edge data
The thickness distribution of cross section is fitted, as shown in Figure 4.
Reject data along plate width direction apart from strip edge certain length, usually take away from edge 40mm to divide
Point is rejected from edge to the data away from the measurement point in edge 40mm, is intended with reducing edge fierceness and being thinned to be distributed transverse gage
Close the influence of curve.
Quartic polynomial regression fit is carried out to the thickness data after rejecting edge data, and then acquisition described four times multinomial
Formula matched curve and its regression equation, specifically:
Y in formula4(x) fourth-degree polynomial curve, mm are distributed for the strip tranverse sectional thickness after the rejecting edge data；x
For the plate width direction discrete point serial number；N is plate width direction discrete point total number；a0~a4For quartic polynomial system
Number.
To it is described rejecting edge data after thickness data calculate the n period moving average, obtain the n (5≤n≤
15) Moving Average and its equation in period:
Y in formulaMA(x) moving average in n period is distributed for the strip tranverse sectional thickness after the rejecting edge data,
Mm illustrates the average value of certain amount point around x, can reflect the region entirety height trend；Y (x) is that strip cross section is thick
Spend the value in x, mm；X is the plate width direction discrete point serial number；N is plate width direction discrete point total number；T is whole
Number, determines according to the value of n.
3) equidistant discretization is carried out to fourth-degree polynomial curve, and subtracts fourth-degree polynomial curve with Moving Average, i.e.,
Quartic polynomial value is subtracted with the moving average at discrete point x, forms the distribution of the difference curve of discretization:
yMA-4(x)=1000 [yMA(x)-y4(x)] x∈[1,N]
(3)
Y in formulaMA-4It (x) is discrete distribution of the difference curve, μm；X is the plate width direction discrete point serial number；N is
Plate width direction discrete point total number.
The certain rule of the basis is acquired the height and width of (recessed) point of local height by distribution of the difference curve, specifically
Are as follows: it is more than the high point threshold value m of setting in the value for having continuous three discrete points for the difference curve of discretization1, or lower than setting
Concave point threshold value m2When, determine that the region has high (recessed) point defect in part.In general, difference is positive, then is local high spot；
Difference is negative, then is local concave point.m1、m2Value and the kind, whereabouts or user of Strip product require related.For hot rolling silicon
Steel, cold rolling base strip product, m1Value is less than 10 μm；For other kinds of hot rolling, m1Value is less than 15 μm；For cold-reduced sheet
Band product, m1Value is related with finished product thickness less than 5 μm.Thickness is thinner, m1Value is smaller.m2Absolute value ratio m1It is usually small by 0
~4 μm.
Find out the left and right critical point that difference curve is more than threshold valueThen the width w of high (recessed) point in part is are as follows:
W in formulamaxjFor local high spot width described in j-th of plate width direction, mm；wminkFor k-th of plate width direction
The part concave point width, mm；Δ x is the width of discrete unit, mm, by the wide B of plate and plate width direction discrete point total number N
It acquires, Δ x=B/N.
In (recessed) the point width range of local height, the height of (recessed) point of local height is obtained by following formula:
H in formulamaxjFor local high spot height described in j-th of plate width direction, μm；hminkFor the plate width direction
K-th of localized indentation point height, μm.
4) calculating difference curve is more than the area of high (recessed) the point threshold line part in part, is obtained by following formula:
S in formulamaxjIt is more than the area of local high spot threshold line part for j-th of difference curve of plate width direction；SminjIt is wide for plate
K-th of direction difference curve is more than the area of local concave point threshold line part；m1For the local high spot threshold value of setting, μm；m2To set
Fixed local concave point threshold value, μm；J is the total number of local high spot present on the cross section that is calculated using formula (6)；K is
The total number of local concave point present on the cross section being calculated using formula (7).
The local high spot or local concave point that the part taken at maximum area is high or concave point height is as strip cross section
Magnitude, be calculated by the following formula:
H in formulamaxFor the magnitude of the local high spot of strip cross section, μm；HminFor the amount of the local concave point of strip cross section
Value, μm；J is the total number of local high spot present on the cross section that is calculated using formula (6)；K is to be calculated using formula (7)
The total number of local concave point present on the cross section arrived.
Step 4) optionally because having carried out discretization to difference curve, formula (8) and formula (9) can also be reduced to
Lower formula is calculated:
S in formulamaxjIt is more than the area of local high spot threshold line part for j-th of difference curve of plate width direction；SminjIt is wide for plate
K-th of direction difference curve is more than the area of local concave point threshold line part；m1For the local high spot threshold value of setting, μm；m2To set
Fixed local concave point threshold value, μm；J is the total number of local high spot present on the cross section that is calculated using formula (6)；K is
The total number of local concave point present on the cross section being calculated using formula (7).
The present invention is suitable for plate belt hot rolling and strip cold rolling mills, local high or concave point online especially suitable for strip cross section
Automatic identification.
It advantages of the present invention and has the beneficial effect that:
The present invention is first handled the strip tranverse sectional thickness data got, is eliminated strip edge and is also easy to produce
Abnormal point, ensure that data validity；Then, thickness data is filtered, and using in investment analysis
The concept of Moving Average, the Moving Average for obtaining thickness data some cycles smooth thickness data, inhibit due to instrument
The influence that table detection and signal transmission etc. cause thickness small range fierceness to fluctuate, realizes filtering and noise reduction.Plate width direction thickness
The Moving Average in n (5≤n≤15) period of distributed data can reflect that the variation of original thickness curve at various locations becomes very well
Gesture, quartic polynomial matched curve can reflect ideal strip cross-sectional profiles very well, quasi- with four times using Moving Average
The difference of curve is closed to judge local high (recessed) point, can be intuitive to see that actual thickness profile deviates the difference of ideal trend, it is real
Now more accurately high (recessed) point defect in part determines；Meanwhile for discrete difference curve, when there is continuous 3 points of the difference to be more than
The threshold value of setting, then it is assumed that the region has high (recessed) point defect in part, and the height and width of (recessed) point of local height is calculated
Degree.Finally, obtaining the part of strip cross section at the Maximum Area that difference curve and high (recessed) point threshold line surround region
The magnitude of high point or local concave point realizes accurately calculating for (recessed) the point parameter of local height.
Detailed description of the invention
High (recessed) the point schematic diagram in Fig. 1 strip cross section part；
High (recessed) the point recognition methods overall schematic in Fig. 2 strip cross section part；
Fig. 3 strip tranverse sectional thickness distribution schematic diagram；
The quartic polynomial matched curve of Fig. 4 strip tranverse sectional thickness distribution and the Moving Average schematic diagram in 10 periods；
High (recessed) the point schematic diagram of Fig. 5 strip tranverse sectional thickness distribution difference curve and part.
Specific embodiment
For above-mentioned technical proposal is further described, with reference to the accompanying drawing and specific embodiment does technical solution of the present invention
Detailed description, it should be understood that the specific features in the embodiment of the present invention and embodiment are to the detailed of technical solution of the present invention
Explanation, rather than the restriction to technical solution of the present invention, in the absence of conflict, in the embodiment of the present invention and embodiment
Technical characteristic can be combined with each other.
The online recognition method schematic diagram of high (recessed) point in strip cross section part provided by the invention is as shown in Figure 2.In Fig. 2
On the basis of, the present embodiment specifically includes the following steps:
Step S1: the wide thickness distribution number of certain strip cross section full width is obtained from online multi-functional instrument or control system
According to, i.e. the equidistant discrete thickness value of plate width, as shown in Figure 3.Plate width B=1120mm, width direction population variance point
Number N=280, unit discrete point width Delta x=4mm.
Step S2: taking away from being cut-point at edge 40mm, reject from edge to the data away from the measurement point in edge 40mm,
Quartic polynomial is respectively adopted again and the Moving Average in 10 (n=10) periods intends the thickness distribution of strip cross section
It closes, matched curve schematic diagram such as Fig. 4.
Certainly, above rejecting strip edge 40mm and n=10 are only a citing, are not intended as limiting.
Step S3: equidistant discretization is carried out to four matched curves, and subtracts four matched curves with Moving Average, is obtained
To discrete strip cross section difference curve, if having continuous 3 points of difference is more than the threshold value of setting, then it is assumed that the region exists
Part height (recessed) point defect, and the height and width of (recessed) point of local height can be obtained, as shown in Figure 5.
Set local high spot threshold value m1=8 μm, the local high spot parameter being calculated are as follows:
xL max1=40, xR max1=54, wmax1=(54-40) × 4=56mm, hmax1=16.7 μm；
xL max2=110, xR max2=115, wmax2=(115-110) × 4=20mm, hmax2=10.3 μm；
Set local concave point threshold value m2=-6 μm, the local concave point parameter being calculated are as follows:
xL min1=28, xR min1=30, wmin1=(30-28) × 4=8mm, hmin1=-7.2 μm；
xL min2=60, xR min2=74, wmin2=(74-60) × 4=56mm, hmin2=-14.1 μm；
xL min3=259, xR min3=267, wmin3=(267-259) × 4=32mm, hmin3=-8.0 μm；
Step S4: calculating difference curve is more than the area of high (recessed) the point threshold line part in part, sees Fig. 5 dash area.Benefit
With formula (10) and formula (11), hatched area calculated result is as follows:
Smax1=0.2726mm2, Smax2=0.0404mm2；
Smin1=0.0103mm2, Smin2=0.3077mm2, Smin3=0.0488mm2。
Take high (recessed) point height in the part at maximum area as the local high spot of strip cross section or the amount of local concave point
Value, then obtain the local high spot magnitude of strip cross section are as follows:
Hmax=hmax1=16.7 μm, wmax1=56mm；
The local concave point magnitude of strip cross section are as follows:
Hmin=hmin2=-14.1 μm, wmin2=56mm.
Certainly, the above setting local high spot threshold value m1=8 μm, local concave point threshold value m2=-6 μm, only one citing,
It is not intended as limiting.
After identifying (recessed) point of local height, display alarm information is shown local high (recessed) point by process control picture
Width and height.In the present embodiment, it is highly 16.7 μm that the width of local high spot, which is 56mm,；The width of local concave point is
56mm is highly -14.1 μm.Meanwhile technical staff understands high (recessed) the point severity in part by warning message, takes corresponding
Regulating measures improve strip shape quality.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications can be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (6)
1. a kind of online recognition method of the local high concave point in strip cross section, it is characterised in that: the method comprises the steps of:
1) it is wide that full width wide thickness profile data, that is, strip in strip cross section is obtained from online multi-functional instrument or control system
Spend corresponding thickness value after equidistant discretization；
2) thickness point that quartic polynomial and the Moving Average in n period is respectively adopted to strip cross section after edge data is rejected
Cloth is fitted, and the value range of n is 5≤n≤15；
3) to fourth-degree polynomial curve carry out discretization, subtract fourth-degree polynomial curve with the Moving Average in n period, obtain from
The difference curve of scattered strip cross section is acquired the height and width of the high concave point in part according to certain rule by difference curve；
The certain rule of the basis is acquired the height and width of the high concave point in part by difference curve, bent for discrete difference
Line is more than the local high spot threshold value m of setting in the value that there are continuous three discrete points in certain region1, or lower than the local concave point of setting
Threshold value m2When, it determines that the region has the high pit defects in part, finds out the region difference curve more than local high spot threshold value or office
The left and right critical point of portion's concave point threshold valueLocally high concave point width w is are as follows:
W in formulamaxjFor j-th of plate width direction local high spot width, mm；wminkFor the local concave point in k-th of plate width direction
Width, mm；It is more than the abscissa of the right critical point of local high spot threshold value for j-th of difference curve；For j-th of difference
Curve is more than the abscissa of the left critical point of local high spot threshold value；It is more than local concave point threshold value for k-th of difference curve
The abscissa of right critical point；It is more than the abscissa of the left critical point of local concave point threshold value for k-th of difference curve；Δ x is
The width of discrete unit, mm are acquired, Δ x=B/N by the wide B of plate and plate width direction discrete point total number N；
In the high concave point width range in part, the height of the high concave point in part is obtained by following formula:
H in formulamaxjFor local high spot height described in j-th of plate width direction, μm；hminkFor k-th of the plate width direction
Localized indentation point height, μm；yMA-4It (x) is discrete difference curve；X is plate width direction discrete point serial number；
4) calculating difference curve is more than the area of part high concave point threshold line part, takes the high concave point height in the part at maximum area
As the local high spot of strip cross section or the magnitude of local concave point.
2. the online recognition method of the local high concave point in strip cross section according to claim 1, it is characterised in that: step 2)
In, reject data along plate width direction apart from strip edge certain length, take away from being cut-point edge 40mm at, rejecting from
The edge extremely data away from the measurement point in edge 40mm；
Quartic polynomial regression fit is carried out to the thickness data after rejecting edge data, and then it is bent to obtain quartic polynomial fitting
Line and its regression equation:
Y in formula4(x) fourth-degree polynomial curve, mm are distributed to reject the strip tranverse sectional thickness after edge data；X is the strip
Width direction discrete point serial number；N is plate width direction discrete point total number；a0~a4For quartic polynomial coefficient；
The moving average in n period is calculated the thickness data after the rejecting edge data, and the movement for obtaining the n period is flat
Equal line and its equation:
Y in formulaMAIt (x) is the moving average for rejecting the strip tranverse sectional thickness distribution n period after edge data, mm；Y (x) is
Value of the strip tranverse sectional thickness in x after rejecting edge data, mm；X is the plate width direction discrete point serial number；N is plate
Bandwidth direction discrete point total number；T is integer, is determined according to the value of n.
3. the online recognition method of the local high concave point in strip cross section according to claim 1, it is characterised in that: step 3)
In, equidistant discretization is carried out to fourth-degree polynomial curve, and subtract fourth-degree polynomial curve with the Moving Average in n period, i.e.,
Quartic polynomial value is subtracted with the moving average in the n period at discrete point x, forms the difference curve of discretization:
yMA-4(x)=1000 [yMA(x)-y4(x)] x∈[1,N] (7)
Y in formulaMA-4It (x) is discrete difference curve, μm；yMAIt (x) is the strip tranverse sectional thickness after the rejecting edge data
It is distributed the moving average in n period, mm；y4(x) it is distributed more than four times for the strip tranverse sectional thickness after the rejecting edge data
Item formula curve, mm；X is the plate width direction discrete point serial number；N is plate width direction discrete point total number.
4. the online recognition method of the local high concave point in strip cross section according to claim 3, it is characterised in that: the difference
It is worth the area that curve is more than part high concave point threshold line part, is calculated by the following formula:
S in formulamaxjIt is more than the area of local high spot threshold line part for j-th of difference curve of plate width direction；SminkFor plate width direction
K-th of difference curve is more than the area of local concave point threshold line part；m1For the local high spot threshold value of setting, μm；m2For setting
Local concave point threshold value, μm；J is the total number of local high spot present on the cross section that is calculated using formula (3)；K is to utilize
The total number of local concave point present on the cross section that formula (4) is calculated；
The high concave point height in part taken at maximum area as the local high spot of strip cross section or the magnitude of local concave point,
It is calculated by the following formula:
H in formulamaxFor the magnitude of the local high spot of strip cross section, μm；HminFor the magnitude of the local concave point of strip cross section, μ
m；hmaxjIt is more than the local high spot height of the area maximum of local high spot threshold line for difference curve, μm；hminkFor difference curve
More than the localized indentation point height of the area maximum of local concave point threshold line, μm；Indicate that any one difference curve is super
Cross the area of local high spot threshold line；Indicate that any one difference curve is more than the area of local concave point threshold line；J is
The total number of local high spot present on the cross section being calculated using formula (3)；K is transversal to be calculated using formula (4)
The total number of local concave point present on face.
5. the online recognition method of the local high concave point in strip cross section according to claim 4, it is characterised in that: to formula
(8) it is reduced to following formula with formula (9) and is calculated:
S in formulamaxjIt is more than the area of local high spot threshold line part for j-th of difference curve of plate width direction；SminkFor plate width direction
K-th of difference curve is more than the area of local concave point threshold line part；m1For the local high spot threshold value of setting, μm；m2For setting
Local concave point threshold value, μm；J is the total number of local high spot present on the cross section that is calculated using formula (3)；K is to utilize
The total number of local concave point present on the cross section that formula (4) is calculated.
6. the online recognition method of the local high concave point in strip cross section according to claim 1-5 is suitable for plate
The on-line automatic identification of the local high concave point in strip cross section with hot rolling and strip cold rolling mills.
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| JP4411918B2 (en) * | 2003-09-26 | 2010-02-10 | Ｊｆｅスチール株式会社 | Quality control method and manufacturing method of steel sheet having oxide film on surface |
| CN101905248B (en) * | 2010-07-27 | 2015-03-18 | 上海梅山钢铁股份有限公司 | Strip steel section shape detecting and identifying method |
| CN103990651B (en) * | 2013-02-19 | 2016-02-24 | 宝山钢铁股份有限公司 | A kind of control device for thin broadband steel high order limit wave and control method thereof |
| CN103920723B (en) * | 2014-04-28 | 2016-06-01 | 武汉钢铁(集团)公司 | Band steel local high spot detection method |
| CN105203731B (en) * | 2015-09-10 | 2017-03-01 | 北京首钢股份有限公司 | A kind of strip steel cross-sectional outling defect local high spot quantization method and device |
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