CN106311758A - Comprehensive setting method suitable for original roughness of surfaces of upper and lower working rolls of cold continuous rolling unit - Google Patents

Abstract

The invention discloses a comprehensive setting method suitable for original roughness of surfaces of upper and lower working rolls of a cold continuous rolling unit, belonging to the field of cold rolling. The method is characterized in that according to the coining ratio relative coefficient of the upper and lower surfaces of strip steel of the unit, product technological parameters and on-site technological parameters in a roll changing cycle are collected; real-time roughness of the upper and lower working rolls when the kth reel is produced is obtained; optimization setting values of roughness of the upper and lower rolls are calculated; by setting reasonable original roughness of the surfaces of the upper and lower working rolls, the difference of emulsion adhesion amount of the upper and lower surfaces of the strip steel is compensated through the roughness setting of the upper and lower working rolls, and roughness difference between the upper and lower surfaces of the strip steel is then reduced, so that the surface quality of the strip steel is ensured. The comprehensive setting method can be widely applied to machining treatment of the surfaces of the upper and lower working rolls of the cold continuous rolling unit and the field of production technique control of the cold continuous rolling unit.

Description

It is suitable for the upper working rolls and lower working rolls surface initial roughness synthetic setting method of tandem mills

Technical field

The invention belongs to cold rolling field, particularly relate to a kind of upper and lower work roll surface being suitable for tandem mills former Beginning roughness synthetic setting method.

Background technology

In the cold continuous rolling of strip steel produces continuously, the feelings that finished strip upper and lower surface roughness is inconsistent often occur Condition, through investigation, finds that this phenomenon is owing to the emulsion adhesion amount difference of strip steel upper and lower surface causes.

It is said that in general, when carrying out rolling mill design, it is ensured that the emulsion quantity for spray of strip steel upper and lower surface is identical, because of This most rolling mill design all can at the equal shower nozzle of the same race of the location arrangements quantity that the upper and lower surface of strip steel is corresponding, But it is true that spray attachment can increase, i.e. due to action of gravity, emulsion loss rate at the emulsion of the lower surface of strip steel Lower surface is for upper surface, and emulsion adhesion amount is little.

${\mathrm{\ξ}}_0=\frac{h_0+h_1}{2h_0}\·k_c\·\frac{3{\mathrm{\θ\η}}_0(v_r+v_0)}{\mathrm{\α}\[1-e^{-\mathrm{\θ}(K-{\mathrm{\σ}}_0)}\]}-k_{rg}\·(1+K_{\mathrm{rs}})\·{\mathrm{Ra}}_{r0}\·e^{-B_L\·L}---\left(1\right)$

(the explanation of formula (1): quoted from " cold continuous rolling high speed manufacturing processes core process mathematical model ", Bai Zhen China, China Machine Press, page 49 formula (2-18), each symbol implication: h₀Frame inlet thickness, h₁— Rack outlet thickness, k_cConcentration of emulsion used affects coefficient, the viscosity coefficient of compressibility of θ lubricant, η₀Lubrication The dynamic viscosity of agent, v_rRoller surface linear velocity, v₀The entrance velocity of band, σ₀Backward pull, k_rgTable Show working roll and the coefficient of belt steel surface Longitudinal Surface Roughness entrained lubricant intensity, k_rsImpressing rate, i.e. working roll table Surface roughness is delivered to the ratio on strip steel, Ra_r0Cold rolling mill work roller initial roughness, B_LWorking roll is coarse Degree attenuation quotient, the rolling milimeter number after L work roll changing).

Understanding according to formula (1), the adhesion amount of emulsion can affect the oil film thickness of belt steel surface, is managed by rolling Opinion may know that, oil film thickness can direct relative friction coefficient, and then cause the roughness difference of strip steel upper and lower surface.

The roughness difference of strip steel upper and lower surface, makes troubles to the production of downstream client, add enterprise's product The unfavorable ratings of board, brings bad impact to enterprise.

Summary of the invention

The technical problem to be solved is to provide a kind of upper working rolls and lower working rolls surface being suitable for tandem mills Initial roughness synthetic setting method, it, by setting rational upper and lower work roll surface initial roughness, makes band The emulsion adhesion amount difference on the upper and lower surface of steel is set by the roughness of upper and lower working roll and compensates, and enters And reduce the roughness difference of strip steel upper and lower surface, it is ensured that and strip surface quality, improve brand competitiveness, Benefit is brought to enterprise.

The technical scheme is that and provide a kind of upper working rolls and lower working rolls surface being suitable for tandem mills original coarse Degree synthetic setting method, it is characterised in that it comprises the following steps:

A () calculates tandem mills strip steel upper and lower surface imprint rate relative coefficient α；

The technological parameter of product in (b) collection roll change cycle, reel number parameter k of definition product strip steel, collect roll change Coil of strip sum Z in cycle, the thickness h of strip steel_k, intensity k of strip steel_k, length W of strip steel_k；

C () collects field apparatus technological parameter in the roll change cycle, when producing kth coiled strip steel, and the drafts ε of milling train_k, Collect tandem mills upper and lower working roll grinding roller thresholding S, L, define upper and lower roll roughness search parameter x, y, And initialize x=y=1, define upper and lower roll roughness step-size in search Δ l, Δ s, define search parameter limit m, p, And m=S/ Δ l+1, p=L/ Δ s+1；

(d) presetting upper and lower roll roughness Ra_0rs1、Ra_0rd1, definition belt steel surface roughness synthesis variance is minimum Value M_min=Z, defines synthesis variance lock variable B, C, and initialization makes B=1, C=1；

E () calculates lower roll initial roughness setting value

Ra_0rdy=Ra_0rd1+(y-1)Δs (6)

F () calculates upper roller initial roughness setting value

Ra_0rsx=Ra_0rs1+(x-1)Δl (7)

G () product reel number parameter k initializes, k=1；

H () calculates the real-time roughness of upper and lower working roll when producing kth coiled strip steel

${\mathrm{Ra}}_{krsx}={\mathrm{Ra}}_{0rsx}\·e^{-B_{sL}\·(W_1+......+W_{k-1})}---\left(8\right)$

${\mathrm{Ra}}_{krdy}={\mathrm{Ra}}_{0rdy}\·e^{-B_{dL}\·(W_1+......W_{k-1})}---(8`)$

B in formula_sL、B_dLRepresent the attenuation quotient of upper and lower working roll respectively, relevant with rolling condition, wherein work as k=1 Time, W₀=0；

I () calculates when producing kth coiled strip steel, top working roll impressing rate

$K_{rssk}=1.183\·th(1.24\×{10}^3\·h_k)\·e^{(-3.25\×{10}^{-10}\·k_k)}\·th(1.729\×10\·{\mathrm{\ϵ}}_k)---\left(9\right)$

J () calculates when producing kth coiled strip steel, bottom working roll impressing rate

K_rsdk=K_rssk·α (10)

K () calculates the upper and lower surface roughness of kth coiled strip steel

Ra_kstripsx=K_rssk·Ra_krsx (11)

Ra_kstripdy=K_rsdk·Ra_krdy (11`)

L () judges k < Z, if it is, make k=k+1 return step (h), no entrance step (m)；

M () calculates strip steel roughness synthesis variance M_xy

$M_{xy}=\sqrt{\underset{k-1}{\overset{Z}{\&Sigma;}}{({\mathrm{Ra}}_{kstripsx}-{\mathrm{Ra}}_{kstripdy})}^2}---\left(12\right)$

N () judges M_xy<M_min, if it is, make M_min=M_xy, and B=x, C=y, proceed to (o)；As The most no, directly proceed to (o)；

O () judges x < m, in this way, make x=x+1, proceed to step (f)；As no, proceed to step (p)；

P () judges y < p, in this way, make y=y+1, x=1, proceed to step (e)；As no, proceed to step (q)；

(q) output B, C；

R () calculates cold continuous rolling upper and lower roll roughness Optimal Setting value

Ra_0rd=Ra_0rd1+(C-1)Δs (13)

Ra_0rs=Ra_0rs1+(B-1)Δl (13`)

S cold continuous rolling grinding roller is processed by () according to calculation optimization value, apply at the scene.

Concrete, described unit strip steel upper and lower surface imprint rate relative coefficient α determines through the following steps:

(a1) set up the unit catalog that capacity is Y, define sample product reel number parameter i, and collect sample The upper surface roughness Ra of interior product_yssi, lower surface roughness Ra_ysxi, produce cold continuous rolling corresponding during sample product Group top working roll roughness Ra_yrsi, working roll roughness Ra_yrxi, parameter i initializes i=1；

(a2) actually impressing rate K of volume i-th sample product is calculated_yrsi, actual lower impressing rate K_yrxi；

$K_{yrsi}=\frac{{\mathrm{Ra}}_{yssi}}{{\mathrm{Ra}}_{yrsi}}---\left(2\right)$

$K_{yrxi}=\frac{{\mathrm{Ra}}_{ysxi}}{{\mathrm{Ra}}_{yrxi}}---(2`)$

(a3) judge i < Y, if it is, make i=i+1, return step (a2)；If it does not, enter step (a4)；

(a4) definition relative coefficient search parameter j, and initialize j=1；Definition relative coefficient step-size in search Δ x；Fixed Justice relative coefficient lock variable A also initializes A=1；Definition relative coefficient locking extreme value N_minAnd initialize order N_min=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 calculated_s

$N_s=\sqrt{\underset{i=1}{\overset{Y}{\&Sigma;}}{({\mathrm{\&alpha;}}^{\&prime;}{K}_{yrsi}-K_{yrxi})}^2}---\left(4\right)$

(a7) N is judged_s<N_min, if it is, make N_min=N_s, A=j, proceed to step (a8), if it does not, Proceed to step (a8)；

(a8) α ' is judged > 0, if it is, make j=j+1, proceed to step step (a5), if it does not, proceed 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 the tandem mills described in technical solution of the present invention Method, in conjunction with equipment and technology feature in band steel cold-tandem rolling production process, by setting rational upper and lower working roll table Face initial roughness, makes the emulsion adhesion amount difference on the upper and lower surface of the strip steel roughness by upper and lower working roll Set and compensate, and then reduce the roughness difference on the upper and lower surface of strip steel, it is ensured that strip surface quality.

Compared with the prior art, the invention have the advantage that

By setting rational upper and lower work roll surface initial roughness, the emulsion of strip steel upper and lower surface is made to adhere to Amount difference is set by the roughness of upper and lower working roll and compensates, and then reduces the thick of the upper and lower surface of strip steel Rugosity difference, it is ensured that strip surface quality, improves brand competitiveness, brings benefit to enterprise.

Accompanying drawing explanation

Fig. 1 is the unit strip steel upper and lower surface impressing rate relative coefficient α calculation process block diagram of the present invention；

Fig. 2 be the present invention always calculate flow diagram.

Detailed description of the invention

In order to further illustrate the application process of the technology of the present invention, as a example by the upper and lower working roll of tandem mills, in detail The Optimal Setting process carefully introducing this unit upper and lower work roll surface roughness is as follows:

(a) calculating tandem mills strip steel upper and lower surface imprint rate relative coefficient α (as shown in fig. 1):

(a1) set up the tandem mills catalog that capacity is 1000, define sample product reel number parameter i, and Collect the upper surface roughness of product, lower surface roughness in sample, produce cold continuous rolling corresponding during sample product Group top working roll roughness, working roll roughness, parameter i initializes i=1；

(a2) the actually impressing rate of volume 1 sample product, actual lower impressing rate are calculated K_yrs1=0.813244663 K_yrx1=0.982702；

(a3) on this basis, it is circulated calculating, until, all in having calculated tandem mills catalog The actually impressing rate of strip steel, actual lower impressing rate；

(a4) definition relative coefficient search parameter j, and initialize j=1；Definition relative coefficient step-size in search Δ x=0.05； Definition relative coefficient lock variable A also initializes A=1；Definition relative coefficient locking extreme value N_minAnd initialize order N_min=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) it is circulated on this basis, completes the search in (0,1) interval, find and make relative coefficient The relative coefficient lock value that locking variance is minimum, and record corresponding A=3；

(a9) upper and lower surface imprint rate relative coefficient α=0.9 is calculated；

The technological parameter of product in (b) collection roll change cycle, reel number parameter k of definition product strip steel, collect roll change Coil of strip sum 120 in cycle, the thickness of strip steel, the intensity of strip steel, the length of strip steel；

C () collects field apparatus technological parameter in the roll change cycle, when producing kth coiled strip steel, and the drafts ε of milling train_k, Collect tandem mills upper and lower working roll grinding roller thresholding S=1.5, L=1.5, definition upper and lower roll roughness search ginseng Number x, y, and initialize x=y=1, define upper and lower roll roughness step-size in search Δ l=0.05, Δ s=0.05, fixed Justice search parameter limit m=31, p=31,；

(d) presetting upper and lower roll roughness Ra_0rs1=1, Ra_0rd1=1, definition belt steel surface roughness comprehensively side Difference minimum M_min=120, define synthesis variance lock variable B, C, and initialization makes B=1, C=1；

E () calculates lower roll initial roughness setting value Ra_0rd1=Ra_0rd1+ (1-1) Δ s=1；

F () calculates upper roller initial roughness setting value Ra_0rs1=Ra_0rs1+ (1-1) Δ l=1；

G () product reel number parameter k initializes, k=1；

H () calculates the real-time roughness Ra of upper and lower working roll when producing 1 coiled strip steel_1rs1=1, Ra_1rd1=1；

I () calculates when producing 1 coiled strip steel, upper, working roll impressing rate K_rssk=0.9825874；

J () calculates when producing kth coiled strip steel, bottom working roll impressing rate K_rsdk=0.9825874 × 0.9=0.88432866；

K () calculates the upper and lower surface roughness Ra of kth coiled strip steel_kstripsx=0.9825874, Ra_kstripdy=0.88432866

(l) on this basis, the upper and lower superficial theory roughness of all coil of strips in having calculated the roll change cycle；

M () calculates strip steel roughness synthesis variance M₁₁=4.35732；

N () on this basis, in having circulated cold continuous rolling grinding roller thresholding, all of roughness sets, and finding out is strip steel The roughness setting that roughness synthesis variance is minimum；

(o) output B=18, C=13；

P () calculates upper and lower roll roughness Optimal Setting value Ra_0rd=1.8, Ra_0rs=1.65.

It always calculates flow diagram as shown in Figure 2.

Compared with prior art, the technical program provides a kind of upper and lower working roll being suitable for tandem mills Surface initial roughness synthetic setting method, it is true that original technology did not consider the upper and lower rough surface of strip steel The difference of degree, the technical program by setting rational upper and lower work roll surface initial roughness, make on strip steel, The emulsion adhesion amount difference of lower surface is set by the roughness of upper and lower working roll and compensates, and then reduces The roughness difference on the upper and lower surface of strip steel, it is ensured that strip surface quality, improves brand competitiveness, gives enterprise Industry brings benefit.

The method can be widely used in the processed of the upper and lower work roll surface of tandem mills and tandem mills Controlling of production process field.

Claims (3)

1. it is suitable for a upper working rolls and lower working rolls surface initial roughness synthetic setting method for tandem mills, its feature It is that it comprises the following steps:

A () calculates unit strip steel upper and lower surface imprint rate relative coefficient α；

The technological parameter of product in (b) collection roll change cycle, reel number parameter k of definition product strip steel, collect roll change Coil of strip sum Z in cycle, the thickness h of strip steel_k, intensity k of strip steel_k, length W of strip steel_k；

C () collects field apparatus technological parameter in the roll change cycle, when producing kth coiled strip steel, and the drafts ε of milling train_k, Collect tandem mills upper and lower working roll grinding roller thresholding S, L, define upper and lower roll roughness search parameter x, y, And initialize x=y=1, define upper and lower roll roughness step-size in search Δ l, Δ s, define search parameter limit m, p, And m=S/ Δ l+1, p=L/ Δ s+1；

(d) presetting upper and lower roll roughness Ra_0rs1、Ra_0rd1, definition belt steel surface roughness synthesis variance is minimum Value M_min=Z, defines synthesis variance lock variable B, C, and initialization makes B=1, C=1；

E () calculates lower roll initial roughness setting value

Ra_0rdy=Ra_0rd1+ (y-1) Δ s (6)

F () calculates upper roller initial roughness setting value

Ra_0rsx=Ra_0rs1+ (x-1) Δ l (7)

G () product reel number parameter k initializes, k=1；

H () calculates the real-time roughness of upper and lower working roll when producing kth volume

${\mathrm{Ra}}_{krsx}={\mathrm{Ra}}_{0rsx}\&CenterDot;e^{-B_{sL}\&CenterDot;\left(W_1+......+W_{k-1}\right)}---\left(8\right)$

${\mathrm{Ra}}_{krdy}={\mathrm{Ra}}_{0rdy}\&CenterDot;e^{-B_{dL}\&CenterDot;\left(W_1+......+W_{k-1}\right)}---\left(8`\right)$

B in formula_sL、B_dLRepresent the attenuation quotient of upper and lower working roll respectively, relevant with rolling condition, wherein work as k=1 Time, W₀=0；

(i) when calculating production kth coiled strip steel, top working roll impressing rate

$K_{rssk}=1.183\&CenterDot;th(1.24\&times;{10}^3\&CenterDot;h_k)\&CenterDot;e^{(-3.25\&times;{10}^{-10}\&CenterDot;k_k)}\&CenterDot;th(1.729\&times;10\&CenterDot;{\mathrm{\&epsiv;}}_k)---\left(9\right)$

J () calculates when producing kth coiled strip steel, bottom working roll impressing rate

K_rsdk=K_rsskα (10)

K () calculates the upper and lower surface roughness of kth coiled strip steel

Ra_kstripsx=K_rssk·Ra_krsx(11)

Ra_kstripdy=K_rsdk·Ra_krdy(11`)

L () judges k < Z, if it is, make k=k+1 return step (h), no entrance step (m)；

M () calculates strip steel roughness synthesis variance M_xy

$M_{xy}=\sqrt{\underset{k=1}{\overset{Z}{\&Sigma;}}{({\mathrm{Ra}}_{kstripsx}-{\mathrm{Ra}}_{kstripdy})}^2}---\left(12\right)$

N () judges M_xy<M_min, if it is, make M_min=M_xy, and B=x, C=y, proceed to (o)；As The most no, directly proceed to (o)；

O () judges x < m, in this way, make x=x+1, proceed to step (f)；As no, proceed to step (p)；

P () judges y < p, in this way, make y=y+1, x=1, proceed to step (e)；As no, proceed to step (q)；

(q) output B, C；

R () calculates upper and lower roll roughness Optimal Setting value

Ra_0rd=Ra_0rd1+ (C-1) Δ s (13)

Ra_0rs=Ra_0rs1+ (B-1) Δ l (13`)

(s) according to calculation optimization value to grinding roller process, apply at the scene, for control described tandem mills, The initial roughness on bottom working roll surface.

2. comprehensive according to the upper working rolls and lower working rolls surface initial roughness being suitable for tandem mills described in claim 1 Establishing method, is characterized in that described unit strip steel upper and lower surface imprint rate relative coefficient α comes through the following steps Determine:

(a1) set up the unit catalog that capacity is Y, define sample product reel number parameter i, and collect sample The upper surface roughness Ra of interior product_yssi, lower surface roughness Ra_ysxi, produce cold continuous rolling corresponding during sample product Group top working roll roughness Ra_yrsi, working roll roughness Ra_yrxi, parameter i initializes i=1；

(a2) actually impressing rate K of volume i-th sample product is calculated_yrsi, actual lower impressing rate K_yrxi；

$K_{yrsi}=\frac{{\mathrm{Ra}}_{yssi}}{{\mathrm{Ra}}_{yrsi}}---\left(2\right)$

$K_{yrxi}=\frac{{\mathrm{Ra}}_{ysxi}}{{\mathrm{Ra}}_{yrxi}}---\left(2`\right)$

(a3) judge i < Y, if it is, make i=i+1, return step (a2)；If it does not, enter step (a4)；

(a4) definition relative coefficient search parameter j, and initialize j=1；Definition relative coefficient step-size in search Δ x；Fixed Justice relative coefficient lock variable A also initializes A=1；Definition relative coefficient locking extreme value N_minAnd initialize order N_min=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 calculated_s

$N_s=\sqrt{\underset{i=1}{\overset{Y}{\&Sigma;}}{({\mathrm{\&alpha;}}^{\&prime;}{K}_{yrsi}-K_{yrxi})}^2}---\left(4\right)$

(a7) N is judged_s<N_min, if it is, make N_min=N_s, A=j, proceed to step (a8), if it does not, Proceed to step (a8)；

(a8) α ' is judged > 0, if it is, make j=j+1, proceed to step step (a5), if it does not, proceed to step (a9)；

(a9) upper and lower surface imprint rate relative coefficient α is calculated

α=1-(A-1) Δ x (5).

3. comprehensive according to the upper working rolls and lower working rolls surface initial roughness being suitable for tandem mills described in claim 1 Establishing method, is characterized in that described synthetic setting method, in conjunction with equipment and technology in band steel cold-tandem rolling production process Feature, by setting rational upper working rolls and lower working rolls surface initial roughness, makes the emulsion of strip steel upper and lower surface adhere to Amount difference is set by the roughness of upper working rolls and lower working rolls and compensates, and then reduces the roughness of strip steel upper and lower surface Difference, it is ensured that strip surface quality.