CN106311758B - It is suitable for the lower work roller surface initial roughness synthetic setting method of tandem mills - Google Patents
It is suitable for the lower work roller surface initial roughness synthetic setting method of tandem mills Download PDFInfo
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Abstract
A kind of lower work roller surface initial roughness synthetic setting method for being suitable for tandem mills, belong to cold rolling field, it is according to unit strip upper and lower surface impressing rate relative coefficient, collect the technological parameter and field apparatus technological parameter of product in the roll change cycle, obtain producing upper when kth is rolled up, the real-time roughness of bottom working roll, in calculating, lower roll roughness optimal setting value, by in setting reasonably, bottom working roll surface initial roughness, make on strip, the emulsion adhesion amount difference of lower surface passes through upper, the roughness of bottom working roll sets to compensate, and then reduce the roughness difference of strip upper and lower surface, it ensure that strip surface quality.It can be widely used for the working process of the upper and lower work roll surface of tandem mills and the controlling of production process field of tandem mills.
Description
Technical field
The invention belongs to cold rolling field, more particularly to a kind of upper and lower work roll surface for being suitable for tandem mills are original
Roughness synthetic setting method.
Background technology
In the cold continuous rolling of strip is continuously produced, the inconsistent feelings of finished strip upper and lower surface roughness often occur
Condition, by investigation, it is due to caused by the emulsion adhesion amount difference of strip upper and lower surface to find this phenomenon.
In general, when carrying out rolling mill design, it is ensured that the emulsion quantity for spray of strip upper and lower surface is identical, therefore greatly
Most rolling mill designs all can in the equal shower nozzle of the same race of the corresponding location arrangements quantity of upper and lower surface of strip, but in fact,
Spray attachment can increase due to Action of Gravity Field, emulsion loss late in the emulsion of the lower surface of strip, i.e., lower surface is relative to upper table
For face, emulsion adhesion amount is small.
(the explanation of formula (1)：Quoted from《Cold continuous rolling high speed manufacturing processes core process mathematical modeling》, Bai Zhenhua, machinery
Industrial publishing house, the formula (2-18) of page 49, each symbol implication：h0- frame inlet thickness, h1- rack outlet thickness, kc- breast
Change liquid concentration influence coefficient, the viscosity compressed coefficient of θ-lubricant, η0The dynamic viscosity of-lubricant, vr- roller surface linear speed
Degree, v0The entrance velocity of-band, σ0- backward pull, krg- represent working roll and belt steel surface Longitudinal Surface Roughness entrained lubricant
The coefficient of intensity, krs- impressing rate, i.e. work roll surface roughness are delivered to the ratio on strip, Rar0- cold rolling mill work roller
Initial roughness, BLRolling milimeter number after-working roll roughness attenuation coefficient, L-work roll changing).
Understand that the adhesion amount of emulsion can influence the oil film thickness of belt steel surface, pass through rolling therory according to formula (1)
Road, oil film thickness can direct relative friction coefficient, and then cause the roughness difference of strip upper and lower surface.
The roughness difference of strip upper and lower surface, can make troubles to the production of downstream client, add to brand names
Unfavorable ratings, bad influence is brought to enterprise
The content of the invention
It is former that the technical problems to be solved by the invention are to provide a kind of lower work roller surface for being suitable for tandem mills
Beginning roughness synthetic setting method, it makes the upper and lower table of strip by the rational upper and lower work roll surface initial roughness of setting
The emulsion adhesion amount difference in face sets to compensate by the roughness of upper and lower working roll, and then reduces above and below strip
The roughness difference on surface, it is ensured that strip surface quality, improves brand competitiveness, benefit is brought to enterprise.
The technical scheme is that：A kind of lower work roller surface initial roughness for being suitable for tandem mills is provided
Synthetic setting method, it is characterised in that it comprises the following steps：
(a) the upper and lower surface imprint rate relative coefficient α of tandem mills strip is calculated；
(b) technological parameter of product in the roll change cycle is collected, the reel number parameter k of product strip is defined, the roll change cycle is collected
Interior coil of strip sum Z, the thickness h of stripk, the intensity k of stripk, the length W of stripk；
(c) field apparatus technological parameter in the roll change cycle is collected, during production kth coiled strip steel, the drafts ε of milling traink, collect
Upper and lower working roll grinding roller thresholding S, L of tandem mills, defines upper and lower roll roughness search parameter x, y, and initialize x=y=
1, upper and lower roll roughness step-size in search Δ l, Δ s are defined, search parameter limit m, p, and m=S/ Δ l+1, p=L/ Δs s+ is defined
1；
(d) presetting upper and lower roll roughness Ra0rs1、Ra0rd1, define belt steel surface roughness synthesis variance minimum Mmin
=Z, defines synthesis variance lock variable B, C, and initialization makes B=1, C=1；
(e) lower roll initial roughness setting value is calculated
Ra0rdy=Ra0rd1+(y-1)Δs (6)
(f) upper roller initial roughness setting value is calculated
Ra0rsx=Ra0rs1+(x-1)Δl (7)
(g) product reel number parameter k is initialized, k=1；
(h) the real-time roughness of upper and lower working roll when producing kth coiled strip steel is calculated
B in formulasL、BdLThe attenuation coefficient of upper and lower working roll is represented respectively, it is relevant with rolling condition, wherein as k=1, W0
=0；
(i) when calculating production kth coiled strip steel, top working roll impressing rate
(j) when calculating production kth coiled strip steel, bottom working roll impressing rate
Krsdk=Krssk·α (10)
(k) the upper and lower surface roughness of kth coiled strip steel is calculated
Rakstripsx=Krssk·Rakrsx (11)
Rakstripdy=Krsdk·Rakrdy (11`)
(l) k is judged<Z, if it is, k=k+1 return to step (h) is made, no entrance step (m)；
(m) strip roughness synthesis variance M is calculatedxy
(n) M is judgedxy<Mmin, if it is, making Mmin=Mxy, and B=x, C=y, it is transferred to (o)；If not, being directly transferred to
(o)；
(o) x is judged<M, in this way, makes x=x+1, is transferred to step (f)；It is such as no, it is transferred to step (p)；
(p) y is judged<P, in this way, makes y=y+1, x=1, is transferred to step (e)；It is such as no, it is transferred to step (q)；
(q) B, C are exported；
(r) cold continuous rolling upper and lower roll roughness optimal setting value is calculated
Ra0rd=Ra0rd1+(C-1)Δs (13)
Ra0rs=Ra0rs1+(B-1)Δl (13`)
(s) cold continuous rolling grinding roller is processed according to calculation optimization value, applied at the scene.
Specifically, the upper and lower surface imprint rate relative coefficient α of described unit strip is determined through the following steps：
(a1) the unit product sample that capacity is Y is set up, sample product reel number parameter i is defined, and collect product in sample
Upper surface roughness Rayssi, lower surface roughness Raysxi, corresponding tandem mills top working roll is thick during production sample product
Rugosity Rayrsi, working roll roughness Rayrxi, parameter i initialization i=1；
(a2) the actually impressing rate K of the sample product of volume i-th is calculatedyrsi, actual lower impressing rate Kyrxi；
(a3) i is judged<Y, if it is, i=i+1 is made, return to step (a2)；If not, into step (a4)；
(a4) relative coefficient search parameter j is defined, and initializes j=1；Define relative coefficient step-size in search Δ x；Define phase
To coefficient lock variable A and initialize A=1；Define relative coefficient locking extreme value NminAnd initialization makes Nmin=Y；
(a5) upper and lower surface imprint rate relative coefficient lock value α ' is calculated
α '=1- (j-1) Δ x (3)
(a6) upper and lower surface imprint rate relative coefficient locking variance N is calculateds
(a7) N is judgeds<Nmin, if it is, making Nmin=Ns, A=j is transferred to step (a8), if not, being transferred to step (a8)；
(a8) α ' is judged>0, if it is, making j=j+1, step step (a5) is transferred to, if not, being transferred to step (a9)；
(a9) upper and lower surface impressing rate relative coefficient α is calculated
α=1- (A-1) Δ x (5).
The upper and lower work roll surface initial roughness synthetic setting side of tandem mills described in technical solution of the present invention
Method, it is original thick by the rational upper and lower work roll surface of setting with reference to equipment and technology feature in band steel cold-tandem rolling production process
Rugosity, makes the emulsion adhesion amount difference on the upper and lower surface of strip set to compensate by the roughness of upper and lower working roll,
And then reduce the roughness difference on the upper and lower surface of strip, it is ensured that strip surface quality.
Compared with the prior art, it is an advantage of the invention that：
By the rational upper and lower work roll surface initial roughness of setting, make the emulsion adhesion amount of strip upper and lower surface
Difference sets to compensate by the roughness of upper and lower working roll, and then the roughness difference on the upper and lower surface of reduction strip,
Strip surface quality is ensure that, brand competitiveness is improved, benefit is brought to enterprise.
Brief description of the drawings
Fig. 1 is the unit strip upper and lower surface impressing rate relative coefficient α calculation process block diagrams of the present invention；
Fig. 2 is total calculating flow diagram of the present invention.
Embodiment
In order to further illustrate the application process of the technology of the present invention, by taking the upper and lower working roll of tandem mills as an example, in detail
The optimal setting process for introducing the upper and lower work roll surface roughness of the unit is as follows：
(a) the upper and lower surface imprint rate relative coefficient α (as shown in fig. 1) of tandem mills strip is calculated：
(a1) the tandem mills product sample that capacity is 1000 is set up, sample product reel number parameter i is defined, and collect sample
Upper table surface roughness, the following table surface roughness of product in this, corresponding tandem mills top working roll is thick during production sample product
Rugosity, working roll roughness, parameter i initialization i=1；
(a2) the actually impressing rate of the sample product of volume 1, actual lower impressing rate K are calculatedyrs1=0.813244663 Kyrx1
=0.982702；
(a3) on this basis, cycle calculations are carried out, until, calculate all strips in tandem mills product sample
Actually impressing rate, reality descend impressing rate；
(a4) relative coefficient search parameter j is defined, and initializes j=1；Define relative coefficient step-size in search Δ x=0.05；
Define relative coefficient lock variable A and initialize A=1；Define relative coefficient locking extreme value NminAnd initialization makes Nmin=1000；
(a5) upper and lower surface imprint rate relative coefficient lock value α '=1 is calculated；
(a6) upper and lower surface imprint rate relative coefficient locking variance is calculated
(a7) circulated on this basis, complete the search in (0,1) interval, finding makes relative coefficient lock variance
Minimum relative coefficient lock value, and record corresponding A=3；
(a9) upper and lower surface imprint rate relative coefficient α=0.9 is calculated；
(b) technological parameter of product in the roll change cycle is collected, the reel number parameter k of product strip is defined, the roll change cycle is collected
Interior coil of strip sum 120, the thickness of strip, the intensity of strip, the length of strip；
(c) field apparatus technological parameter in the roll change cycle is collected, during production kth coiled strip steel, the drafts ε of milling traink, collect
Upper and lower working roll grinding roller thresholding S=1.5, L=1.5 of tandem mills, defines upper and lower roll roughness search parameter x, y, and just
Beginningization x=y=1, defines upper and lower roll roughness step-size in search Δ l=0.05, Δ s=0.05, defines search parameter limit m=
31st, p=31,；
(d) presetting upper and lower roll roughness Ra0rs1=1, Ra0rd1=1, define belt steel surface roughness synthesis variance minimum
Value Mmin=120, synthesis variance lock variable B, C is defined, and initialization makes B=1, C=1；
(e) lower roll initial roughness setting value Ra is calculated0rd1=Ra0rd1+ (1-1) Δ s=1；
(f) upper roller initial roughness setting value Ra is calculated0rs1=Ra0rs1+ (1-1) Δ l=1；
(g) product reel number parameter k is initialized, k=1；
(h) the real-time roughness Ra of upper and lower working roll when producing 1 coiled strip steel is calculated1rs1=1, Ra1rd1=1；
(i) when calculating 1 coiled strip steel of production, upper, working roll impressing rate Krssk=0.9825874；
(j) when calculating production kth coiled strip steel, bottom working roll impressing rate Krsdk=0.9825874 × 0.9=
0.88432866；
(k) the upper and lower surface roughness Ra of kth coiled strip steel is calculatedkstripsx=0.9825874, Rakstripdy=
0.88432866
(l) on this basis, the upper and lower superficial theory roughness of all coil of strips in the roll change cycle has been calculated；
(m) strip roughness synthesis variance M is calculated11=4.35732；
(n) on this basis, roughness settings all in cold continuous rolling grinding roller thresholding have been circulated, it is strip roughness to find out
The minimum roughness setting of synthesis variance；
(o) B=18, C=13 are exported；
(p) upper and lower roll roughness optimal setting value Ra is calculated0rd=1.8, Ra0rs=1.65.
Its total calculating flow diagram is as shown in Figure 2.
Compared with prior art, a kind of upper and lower working roll table for being suitable for tandem mills is provided in the technical program
Face initial roughness synthetic setting method, in fact, original technology did not consider the difference of the upper and lower surface roughness of strip,
The technical program adheres to the emulsion on the upper and lower surface of strip by the rational upper and lower work roll surface initial roughness of setting
Amount difference sets to compensate by the roughness of upper and lower working roll, and then it is poor to reduce the roughness on the upper and lower surface of strip
It is different, it is ensured that strip surface quality, brand competitiveness is improved, benefit is brought to enterprise.
It the method can be widely used in the life of the working process and tandem mills of the upper and lower work roll surface of tandem mills
Production. art control field.
Claims (3)
1. a kind of lower work roller surface initial roughness synthetic setting method for being suitable for tandem mills, it is characterised in that it
Comprise the following steps：
(a) the upper and lower surface imprint rate relative coefficient α of unit strip is calculated；
(b) technological parameter of product in the roll change cycle is collected, the reel number parameter k of product strip is defined, steel in the roll change cycle is collected
Roll up sum Z, the thickness h of stripk, the intensity k of stripk, the length W of stripk；
(c) field apparatus technological parameter in the roll change cycle is collected, during production kth coiled strip steel, the drafts ε of milling traink, collect cold company
Upper and lower working roll grinding roller thresholding S, L of milling train group, defines upper and lower working roll roughness search parameter x, y, and initialize x=y=
1, upper and lower working roll roughness step-size in search Δ l, Δ s are defined, search parameter limit m, p, and m=S/ Δs l+1, p=L/ is defined
Δs+1；
(d) presetting upper and lower working roll roughness Ra0rs1、Ra0rd1, define belt steel surface roughness synthesis variance minimum Mmin
=Z, defines synthesis variance lock variable B, C, and initialization makes B=1, C=1；
(e) bottom working roll initial roughness setting value is calculated
Ra0rdy=Ra0rd1+(y-1)Δs (6)
(f) top working roll initial roughness setting value is calculated
Ra0rsx=Ra0rs1+(x-1)Δl (7)
(g) product reel number parameter k is initialized, k=1；
(h) the real-time roughness of upper and lower working roll when production kth is rolled up is calculated
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B in formulasL、BdLThe attenuation coefficient of upper and lower working roll is represented respectively, it is relevant with rolling condition, wherein as k=1, W0=0；
(i) when calculating production kth coiled strip steel, top working roll impressing rate
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(j) when calculating production kth coiled strip steel, bottom working roll impressing rate
Krsdk=Krssk·α (10)
(k) the upper and lower surface roughness of kth coiled strip steel is calculated
Rakstripsx=Krssk·Rakrsx (11)
Rakstripdy=Krsdk·Rakrdy (11`)
(l) k is judged<Z, if it is, k=k+1 return to step (h) is made, no entrance step (m)；
(m) strip roughness synthesis variance M is calculatedxy
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(n) M is judgedxy＜ Mmin, if it is, making Mmin=Mxy, and B=x, C=y, it is transferred to (o)；If not, being directly transferred to (o)；
(o) x is judged<M, in this way, makes x=x+1, is transferred to step (f)；It is such as no, it is transferred to step (p)；
(p) y is judged<P, in this way, makes y=y+1, x=1, is transferred to step (e)；It is such as no, it is transferred to step (q)；
(q) B, C are exported；
(r) upper and lower working roll roughness optimal setting value is calculated
Ra0rd=Ra0rd1+(C-1)Δs (13)
Ra0rs=Ra0rs1+(B-1)Δl (13`)
(s) grinding roller is processed according to calculation optimization value, applied at the scene, the upper and lower work for controlling the tandem mills
The initial roughness of roller surface.
2. according to the lower work roller surface initial roughness synthetic setting side for being suitable for tandem mills described in claim 1
Method, it is characterized in that the upper and lower surface imprint rate relative coefficient α of described unit strip is determined through the following steps：
(a1) the unit product sample that capacity is Y is set up, sample product reel number parameter i is defined, and collect the upper of product in sample
Surface roughness Rayssi, lower surface roughness Raysxi, corresponding tandem mills top working roll roughness during production sample product
Rayrsi, bottom working roll roughness Rayrxi, parameter i initialization i=1；
(a2) the actually impressing rate K of the sample product of volume i-th is calculatedyrsi, actual lower impressing rate Kyrxi；
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(a3) i is judged<Y, if it is, i=i+1 is made, return to step (a2)；If not, into step (a4)；
(a4) relative coefficient search parameter j is defined, and initializes j=1；Define relative coefficient step-size in search Δ x；The relative system of definition
Number lock variable A simultaneously initializes A=1；Define relative coefficient locking extreme value NminAnd initialization makes Nmin=Y；
(a5) upper and lower surface imprint rate relative coefficient lock value α ' is calculated
α '=1- (j-1) Δs x
(a6) upper and lower surface imprint rate relative coefficient locking variance N is calculateds
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</msqrt>
</mrow>
(a7) N is judgeds＜ Nmin, if it is, making Nmin=Ns, A=j is transferred to step (a8), if not, being transferred to step (a8)；
(a8) judge α ' ＞ 0, if it is, making j=j+1, be transferred to step step (a5), if not, being transferred to step (a9)；
(a9) upper and lower surface imprint rate relative coefficient α is calculated
α=1- (A-1) Δs x.
3. according to the lower work roller surface initial roughness synthetic setting side for being suitable for tandem mills described in claim 1
Method, it is characterized in that described synthetic setting method, with reference to equipment and technology feature in band steel cold-tandem rolling production process, passes through setting
Rational lower work roller surface initial roughness, makes the emulsion adhesion amount difference of strip upper and lower surface pass through upper working rolls and lower working rolls
Roughness set and compensate, and then reduce the roughness difference of strip upper and lower surface, it is ensured that strip surface quality.
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| US3958435A (en) * | 1974-06-01 | 1976-05-25 | Nippon Steel Corporation | Method for controlling the profile of workpieces on rolling mills |
| US4071657A (en) * | 1974-11-06 | 1978-01-31 | Societe Lorraine De Laminage Continu | Metal sheet for drawing |
| CN103419137A (en) * | 2012-05-25 | 2013-12-04 | 宝山钢铁股份有限公司 | Roller surface strengthening and roughness controlling method |
| CN103962390A (en) * | 2013-01-28 | 2014-08-06 | 宝山钢铁股份有限公司 | Comprehensive setting method for tension and rolling pressure in VC (Variable Crown) roll temper mill wet leveling process |
| CN104002203A (en) * | 2014-05-30 | 2014-08-27 | 宝山钢铁股份有限公司 | Production method of adjustable controllable high-roughness roughened surface of thin belt continuous casting crystallization roller |
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| US3958435A (en) * | 1974-06-01 | 1976-05-25 | Nippon Steel Corporation | Method for controlling the profile of workpieces on rolling mills |
| US4071657A (en) * | 1974-11-06 | 1978-01-31 | Societe Lorraine De Laminage Continu | Metal sheet for drawing |
| CN103419137A (en) * | 2012-05-25 | 2013-12-04 | 宝山钢铁股份有限公司 | Roller surface strengthening and roughness controlling method |
| CN103962390A (en) * | 2013-01-28 | 2014-08-06 | 宝山钢铁股份有限公司 | Comprehensive setting method for tension and rolling pressure in VC (Variable Crown) roll temper mill wet leveling process |
| CN104002203A (en) * | 2014-05-30 | 2014-08-27 | 宝山钢铁股份有限公司 | Production method of adjustable controllable high-roughness roughened surface of thin belt continuous casting crystallization roller |
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