CN105868432A - Simple and convenient calculation method for roll shape of working roll of hot continuous rolling mill - Google Patents

Abstract

The invention relates to a simple and convenient calculation method of a hot continuous rolling mill working roll profile, which selects m grades of steel plates for calculation: weighting the rolling schedule parameters of the m grades of steel plates according to the yield ratio of the m grades of steel plates to obtain the rolling schedule parameters of one steel plate, and setting the steel plate as an SE steel plate; setting the initial value of the bending force of the working roll as a balance force; setting the roll shifting position as an initial zero position; and optimizing the roll profile configuration from the last frame Fn according to the principle of constant proportion crown of the strip steel by a simplified calculation formula of the crown of the strip steel plate, and sequentially calculating the roll profiles of Fn-1, Fn-2, F2 and F1 until the roll profile reaches a finish rolling F1 frame. The advantages are that: the method avoids complex solving processes of models such as metal plastic deformation, roller system elastic deformation and the like, and simply, conveniently and quickly calculates the optimal roller profile configuration of the rolling mill, so that the same group of roller profiles can be suitable for production of various steel plates, is suitable for actual production, and realizes good control of the shape of the hot-rolled strip steel.

Description

A kind of simple calculating method of continuous hot-rolling mill working roller

Technical field

The present invention relates to the roll shape field of configuration of continuous hot-rolling mill, particularly relate to the easy calculating of a kind of continuous hot-rolling mill working roller Method.

Background technology

In the case of hot finisher type determines, roll shape becomes belt plate shape and controls means the most direct, maximally effective, is permitted Many belt plate shapes control technology and are mostly around changing the roll shape of roll and carrying out, and the purpose of working roller design is exactly to the greatest extent Can guarantee that each rack outlet strip profile and flatness is good, finished strip section convexity is qualified.And the calculating of roll shape value is a complexity Process, need the coupling iterative of the models such as simultaneous metal plastic deformation, roll elastic deformation, calculate the time long, roller It is slow that type configuration puts into scene application, it is impossible to quickly meets scene and is actually needed.

Summary of the invention

For overcoming the deficiencies in the prior art, it is an object of the invention to provide the easy calculating side of a kind of continuous hot-rolling mill working roller Method, it is to avoid by the complicated solving process of the model such as metal plastic deformation, roll elastic deformation, simple and efficient calculating is rolled The optimal roll shape of machine configures, it is achieved the good control of Flatness of Hot Rolled Strip.

For achieving the above object, the present invention is achieved through the following technical solutions:

The simple calculating method of a kind of continuous hot-rolling mill working roller, comprises the following steps:

1) m ideal format product of on-the-spot actual production is selected to calculate: according to the rolling schedule of m typical products Parameter, is weighted into the rolling schedule parameter of a product by its annual production ratio, if this band steel steel trade mark is SE, it adds Power formula is:

In formula (1):Product proportion coefficient；d_iFor certain typical products annual production；W is each typical products gross annual output amount；I is Ideal format production code member；

Thickness parameter with steel SE is:

In formula (2): H_jFor band steel SE at the thickness of jth frame；h_ijFor typical products i at the thickness of jth frame；N is tandem rolling Machine frame number；

Roll-force parameter with steel SE is:

In formula (3): P_jFor band steel SE in the roll-force of jth frame；f_ijFor typical products i in the roll-force of jth frame；

2) initial value of work roll bending power is set as equilibrant force；Roll shifting position is set to initial zero position；Input SE steel plate Rolling schedule parameter, by the reduced mechanical model of band plate crown, according to the band steel constant principle of ratio convexity, from end frame Fn starts to optimize roll shape configuration, calculates Fn-1, Fn-2 successively, F2, F1 frame roll shape；

3) export each frame roll shape parameter of curve, terminate to calculate.

The computing formula of described band plate crown is:

$\mathrm{\ΔC}=\frac{P}{K_p}-\frac{{2S}_1}{K_{S1}}-\frac{{\mathrm{\ΔD}}_1}{K_1}+\frac{S_w}{K_w}+\frac{{\mathrm{\ΔH}}_b}{K_b}+\mathrm{\σ}$

In formula: P is total draught pressure；Kp is the milling train lateral stiffness coefficient for draught pressure；S₁List for working roll Side bending roller force；K_S1Coefficient is affected for work roll bending power；△D₁Comprehensive convexity for roll；K₁Shadow for roll crown Ring coefficient；S_wRoll shifting amount for working roll；K_wCoefficient is affected for working roll roll shifting amount；△H_bFor supplied materials strip crown；K_b Coefficient is affected for supplied materials strip crown；σ be consider before and after tension force impact constant.

The described band steel constant principle of ratio convexity:

c₁/h₁=C₁/H₁

In formula: c₁、C₁It is respectively frame entrance and exit band plate crown；h₁、H₁It is respectively frame entrance and exit band steel Thickness.

Compared with prior art, the invention has the beneficial effects as follows:

The present invention combines production and actual carries out independent development, it is to avoid by the model such as metal plastic deformation, roll elastic deformation Complicated solving process, simple and efficient calculates the configuration of milling train optimal roll shape, enables to be suitable for the many product of many specifications with organizing roll shape Plant band steel to produce, it is adaptable to steel rolling mill's actual production, it is achieved that the good control of Flatness of Hot Rolled Strip.

Accompanying drawing explanation

Fig. 1 is the roll shape calculation flow chart of the present invention.

Detailed description of the invention

Below in conjunction with Figure of description, the present invention is described in detail, it should be noted that the enforcement of the present invention be not limited to Under embodiment.

The simple calculating method of continuous hot-rolling mill working roller, comprises the following steps:

1) m ideal format product of produced on-site is selected to calculate: according to the rolling schedule parameter of m belt steel product, By m (m=1,2,3 ...) and individual product yield ratio is weighted into the rolling schedule parameter of a kind of steel grade, if this band steel The steel trade mark is SE, and its weighted formula is:

In formula (1):Product proportion coefficient；d_iFor certain typical products annual production；W is each typical products gross annual output amount；I is Ideal format production code member.

Thickness parameter with steel SE is

In formula (2): H_jFor band steel SE at the thickness of jth frame；h_ijFor typical products i at the thickness of jth frame；N is tandem rolling Machine frame number.

Roll-force parameter with steel SE is

In formula (3): P_jFor band steel SE in the roll-force of jth frame；f_ijFor typical products i in the roll-force of jth frame.

2) initial value of work roll bending power is set as equilibrant force；Roll shifting position is set to initial zero position；Input SE steel plate Rolling schedule parameter, by the reduced mechanical model of band plate crown, according to the band steel constant principle of ratio convexity, from end frame Fn starts to optimize roll shape configuration, calculates Fn-1, Fn-2 successively, F2, F1 roll shape；

3) export each frame roll shape parameter of curve, terminate to calculate.

The computing formula of described band plate crown is:

$\mathrm{\ΔC}=\frac{P}{K_p}-\frac{{2S}_1}{K_{S1}}-\frac{{\mathrm{\ΔD}}_1}{K_1}+\frac{S_w}{K_w}+\frac{{\mathrm{\ΔH}}_b}{K_b}+\mathrm{\σ}$

In formula: P is total draught pressure；Kp is the milling train lateral stiffness coefficient for draught pressure；S₁List for working roll Side bending roller force；K_S1Coefficient is affected for work roll bending power；△D₁Comprehensive convexity for roll；K₁Shadow for roll crown Ring coefficient；S_wRoll shifting amount for working roll；K_wCoefficient is affected for working roll roll shifting amount；△H_bFor supplied materials strip crown；K_b Coefficient is affected for supplied materials strip crown；σ be consider before and after tension force impact constant.

The described band steel constant principle of ratio convexity:

c₁/h₁=C₁/H₁

In formula: c₁、C₁It is respectively frame entrance and exit band plate crown；h₁、H₁It is respectively frame entrance and exit band steel Thickness.

Embodiment:

See Fig. 1, hot continuous rolling 1580mm seven frame mm finishing mill unit, two, enchashment field (m=2) typical products SPHC steel plate: thick The widest=3.0*1250mm and SPHC steel plate: the rolling schedule parameter of thick * width=2.5*1250mm, is shown in Tables 1 and 2:

Table 1 product 1 rolling schedule parameter

Frame/parameter	F1	F2	F3	F4	F5	F6	F7
								Exit thickness H (mm)	22.30	12.70	8.25	5.70	4.43	3.52	3.00
Roll-force P (T)	1905	1780	1550	1500	1120	810	670

Table 2 product 2 rolling schedule parameter

Frame/parameter	F1	F2	F3	F4	F5	F6	F7
								Exit thickness H (mm)	19.56	12.02	7.63	4.96	3.47	2.78	2.50
Roll-force P (T)	2135	1840	1850	1600	1280	950	770

Two typical products gross annual output amounts are 1,000,000 tons, and wherein product 1 annual production is 500,000 tons, and product 2 annual production is 500000 tons.Product proportion coefficient is drawn by the weighting of its production ratio according to formula (1):

According to formula (2) and formula (3), it is weighted to the rolling schedule parameter of steel grade SE by its production ratio, is shown in Table 3:

Analogize H₂、H₃、H₄、H₅、H₆、H₇。

Analogize P₂、P₃、P₄、P₅、P₆、P₇。

Table 3 product SE rolling schedule parameter

Frame/parameter	F1	F2	F3	F4	F5	F6	F7
								Exit thickness H (mm)	20.93	12.36	7.94	5.33	3.95	3.15	2.75
Roll-force P (T)	2020	1810	1700	1550	1200	880	720

After rolling, band plate crown can calculate with following formula:

$\mathrm{\ΔC}=\frac{P}{K_p}-\frac{{2S}_1}{K_{S1}}-\frac{{\mathrm{\ΔD}}_1}{K_1}+\frac{S_w}{K_w}+\frac{{\mathrm{\ΔH}}_b}{K_b}+\mathrm{\σ}---\left(4\right)$

In formula (4): P is total draught pressure；Kp is the milling train lateral stiffness coefficient for draught pressure；S₁For work The unilateral bending roller force of roller；K_S1Coefficient is affected for work roll bending power；△D₁Comprehensive convexity for roll；K₁Convex for roll That spends affects coefficient；S_wRoll shifting amount for working roll；K_wCoefficient is affected for working roll roll shifting amount；△H_bConvex for carrying out flitch Degree；K_bCoefficient is affected for supplied materials strip crown；σ be consider before and after tension force impact constant.

Model coefficient and material, thickness, width and the relating to parameters such as roll shape and roll shifting position, rolled real data by scene Recurrence determines.Return through on-the-spot actual rolling data and be:

$\mathrm{\ΔC}=\frac{P}{25.7}-\frac{{2S}_1}{2.2}-\frac{{\mathrm{\ΔD}}_1}{1.47}+\frac{S_w}{89.2}+\frac{{\mathrm{\ΔH}}_b}{17.5}-24---\left(5\right)$

Formula (5) takes initial bending roller force S₁For equilibrant force relative value 0 ton, S_wFor initial zero position, △ H_bSupplied materials strip crown Changing value is zero.Band steel SE target thickness 2.75mm, target convexity is 45 μm.

According to the band steel constant principle of ratio convexity:

c₁/h₁=C₁/H₁ (6)

In formula: c₁、C₁It is respectively frame entrance and exit band plate crown；h₁、H₁It is respectively frame entrance and exit band steel Thickness.It is calculated milling train F1-F7 frame working roller value, is shown in Table 4:

Table 4 each breast roll shape parameter

Frame	F1	F2	F3	F4	F5	F6	F7
								Roll shape value (μm)	-423	-229	-129	-75	-62	-61	-60

Claims (3)

1. the simple calculating method of a continuous hot-rolling mill working roller, it is characterised in that comprise the following steps:

1) m ideal format product of on-the-spot actual production is selected to calculate: according to the rolling schedule of m typical products Parameter, is weighted into the rolling schedule parameter of a product by its annual production ratio, if this band steel steel trade mark is SE, it adds Power formula is:

In formula (1):Product proportion coefficient；d_iFor certain typical products annual production；W is each typical products gross annual output amount；I is typical case Specification product is numbered；

Thickness parameter with steel SE is:

In formula (2): H_jFor band steel SE at the thickness of jth frame；h_ijFor typical products i at the thickness of jth frame；N is tandem rolling Machine frame number；

Roll-force parameter with steel SE is:

In formula (3): P_jFor band steel SE in the roll-force of jth frame；f_ijFor typical products i in the roll-force of jth frame；

2) initial value of work roll bending power is set as equilibrant force；Roll shifting position is set to initial zero position；Input SE steel plate Rolling schedule parameter, by the reduced mechanical model of band plate crown, according to the band steel constant principle of ratio convexity, from end frame Fn starts to optimize roll shape configuration, calculates Fn-1, Fn-2 successively, F2, F1 frame roll shape；

3) export each frame roll shape parameter of curve, terminate to calculate.

The simple calculating method of a kind of continuous hot-rolling mill working roller the most according to claim 1, it is characterised in that The computing formula of described band plate crown is:

$\mathrm{\ΔC}=\frac{P}{K_p}-\frac{2S_1}{K_{S1}}-\frac{\mathrm{\Δ}{D}_1}{K_1}+\frac{S_w}{K_w}+\frac{\mathrm{\Δ}{H}_b}{K_b}+\mathrm{\σ}$

In formula: P is total draught pressure；Kp is the milling train lateral stiffness coefficient for draught pressure；S₁List for working roll Side bending roller force；K_S1Coefficient is affected for work roll bending power；△D₁Comprehensive convexity for roll；K₁Shadow for roll crown Ring coefficient；S_wRoll shifting amount for working roll；K_wCoefficient is affected for working roll roll shifting amount；△H_bFor supplied materials strip crown；K_b Coefficient is affected for supplied materials strip crown；σ be consider before and after tension force impact constant.

The simple calculating method of a kind of continuous hot-rolling mill working roller the most according to claim 1, it is characterised in that The described band steel constant principle of ratio convexity:

c₁/h₁=C₁/H₁

In formula: c₁、C₁It is respectively frame entrance and exit band plate crown；h₁、H₁It is respectively frame entrance and exit band steel Thickness.