CN102172636A - Multi roll mill and method for controlling multi roll mill - Google Patents

Abstract

The invention discloses a multi roll mill which is provided with both functions of edge drop control and shape control and a method of controlling the multi roll mill. In the multi roll mill R provided with first intermediate rolls 12a, 12b to work rolls 11a, 11b, a comparatively gentle taper is formed for controlling the shape in the end part of one side of the first intermediate roll 12a, 12b and a comparatively steep taper is formed for controlling the edge drop in the other end. These intermediate rolls 12a, 12b are arranged so that the tapers are alternated up and down and, further, they are made shiftable in the axial direction. As for edge drop control, the first intermediate rolls 12a, 12b are shifted before starting rolling so that the tapers for controlling the edge drop are situated in the position of the end of the sheet of the material 1 to be rolled. As for the shape control, the first intermediate rolls 12a, 12b are shifted similarly before starting the rolling so that the tapers for controlling the shape are situated in the position of the end of the sheet.

Description

The control method of multi-roll mill and multi-roll mill

Technical field

The present invention relates to multi-roll mill and control method thereof, relate in particular to milling train and control method thereof that the plate shape that can control rolled stock and thickness of slab distribute.

Background technology

Extensively adopt the silicon steel plate of cold rolling processing in electromagnetic steel plate, but in recent years, at this moment cold rolling adds man-hour all the time, the multi-roll mills that are called as sendzimir mill etc. that adopt more.

, in having adopted so cold rolling processing of milling train, so-called limit occurs and fall.Herein, so-called this limit falls and is meant on the thin plate of rolling processing, and the precipitous thickness of slab that occurs in the end of its plate width direction reduces the zone.

In addition, under the situation of this electromagnetic steel plate, most of situation is used as laminated body, in such cases, if the thickness of slab of plate width direction is inconsistent because of the limit falls, and the form accuracy when then being difficult to keep as laminated body.Therefore, in such cases, special requirement suppress the limit and fall.

, as the countermeasure of this kind situation, there is pruning (cutting away) to produce the method in the zone that the limit falls.But, because yield rate significantly reduces in the method, the very wise move of can not saying so, therefore, in electromagnetic steel plate rolling, control falls in the limit becomes indispensable technology.

Thereby, proposed multiplely to fall the scheme of control about this limit all the time, therefore, in certain conventional art, proposed the continuous limit that has disposed the tandem mill of many milling trains and fallen control (for example, with reference to patent documentation 1).

In the prior art, employing is provided with chamfering (chanfer: trapezoidal working roll chamfered part) in roll end, make it can be at the plate width direction superior displacement, make working roll at the plate width direction superior displacement, implement the pressure control of bending forcing press (roll bender), the limit amount of falling is controlled to be the value of hope.

As conventional art, also proposed to adopt this sendzimir mill to implement the example (for example, with reference to patent documentation 2) that control falls in the limit.

In addition, in the conventional art, on first intermediate calender rolls, taper is set, makes first intermediate calender rolls, adjust the drafts of plate end thus, the control limit amount of falling at the plate width direction superior displacement.

Patent documentation 1: Japanese kokai publication sho 60-12213 communique

Patent documentation 2: TOHKEMY 2003-285112 communique

Above-mentioned conventional art is not considered and need be given the function this point that the both sides of control and shape control fall in the limit to multi-roll mill, thereby has problems in the inhibition of Products Quality raising and cost.

The limit of conventional art falls control and is applicable to tandem mill, except that the conventional art, for example also discloses the various technology of utilizing working roll intersection etc.

But, when adopting sendzimir mill, as described in conventional art, if working roll has been added chamfering or taper, then, on goods, produce unwanted trace near this flex point, so be difficult to use because the plate that is rolled is depressed significantly.

In addition, in the conventional art, make the working roll displacement in order to carry out the limit to fall control, but when adopting sendzimir mill, on its structure, be extremely difficult in that shift mechanism is set on the working roll, therefore, in sendzimir mill, also do not implement effective limit and fall control.

In recent years, strong request improves the quality of electromagnetic steel plate more, for milling train, and as specification performance, the control that not only requires the limit to fall, and require the control of plate shape.In addition, herein, so-called plate shape is meant the flatness of rolled metal band, and so-called above-mentioned limit falls or the plate profile is meant that the thickness of slab on the plate width direction of rolled metal band distributes.

, in sendzimir mill having been implemented the conventional art that control falls in above-mentioned limit, on first intermediate calender rolls, taper is set herein, makes this first intermediate calender rolls, adjust the drafts of plate end thus, the control limit amount of falling at the plate width direction superior displacement.

At this moment, in the such multi-roll mill of sendzimir mill, usual way is, employing is called as roller amount of deflection (roll bending) mechanism of AS-U and makes the mechanism of the intermediate calender rolls displacement that has added taper or roller convex surface, the shape of coming control panel, therefore, sendzimir mill has been implemented the conventional art that control falls in above-mentioned limit, as the method for control panel shape, be usual way, just be attached to the shape difference of the taper on the roller.

In addition, because the shift function of first intermediate calender rolls in the conventional art just is used for the function that control falls in the limit, thus even adopted the shift function of first intermediate calender rolls, owing to adopted with the limit the identical intermediate calender rolls of control falls, so also difficulty is carried out shape control.

Summary of the invention

The problem to be solved in the present invention is, in multi-roll mills such as sendzimir mill, under the situation of the structure that does not change milling train, adopt same roller to use the limit and fall control and shape control, thereby, the objective of the invention is to, provide a kind of and possess the limit and fall the multi-roll mill of both sides' function that control and shape control and the control method of multi-roll mill.

For achieving the above object, a kind of multi-roll mill is provided, it possesses 2 intermediate calender rolls at each working roll at least, wherein, described intermediate calender rolls possesses shape respectively in a side end and the opposing party's the different taper in end, described intermediate calender rolls clips and is rolled material, and about conical in shape dispose symmetrically a side and the opposing party, described intermediate calender rolls remains can be at axial superior displacement separately.

At this moment, the conical in shape of a side's of described intermediate calender rolls end is that the limit falls control use conical in shape, the conical in shape of the opposing party's end be that shape is controlled and to be used conical in shape, can achieve the above object.

Equally, in order to achieve the above object, a kind of control method of multi-roll mill is provided, described multi-roll mill possesses 2 intermediate calender rolls at each working roll at least, described intermediate calender rolls possesses shape in a side end and the opposing party's the different taper in end, described intermediate calender rolls clips and is rolled material, and about conical in shape dispose symmetrically a side and the opposing party, these intermediate calender rolls remain can be at axial superior displacement separately, and the control method of this multi-roll mill is characterised in that, in the per pass rolling process, judgement is to implement the limit to fall control, still implement shape control, before rolling beginning, according to the shift position of the described intermediate calender rolls of each control change.

At this moment, possess the SHAPE DETECTION device of measuring the shape that is rolled material, judge whether to implement described limit according to the measurement result of described SHAPE DETECTION device and fall control, can realize above-mentioned purpose at the outlet side of rolling process.

(invention effect)

According to the present invention, owing to adopt same roller can arrive that control falls in the limit and shape is controlled, thereby in rolling, do not need to change intermediate calender rolls, so can improve quality of item not damaging under the productive situation.

Description of drawings

Fig. 1 is the pie graph of an embodiment of expression multi-roll mill of the present invention.

Fig. 2 is the key diagram that the shift position of controlling first intermediate calender rolls when using falls in the limit of one embodiment of the present invention.

Fig. 3 is the key diagram that the shape of one embodiment of the present invention is controlled the shift position of first intermediate calender rolls when using.

Fig. 4 is the key diagram of an example that presets (preset) arithmetic unit of expression one embodiment of the present invention.

Fig. 5 is the key diagram that an example of control arithmetic unit falls in the limit of expression one embodiment of the present invention.

Fig. 6 is the key diagram that the example that control could decision maker falls in the limit of expression one embodiment of the present invention.

Fig. 7 is the key diagram that the handling process of the example that control could decision maker falls in the limit of one embodiment of the present invention.

Among the figure: 1-is rolled material, 2-input side profile detector, 3-outlet side profile detector, 4-SHAPE DETECTION roller, 11a, the 11b-working roll, 12a, 12b-first intermediate calender rolls, 13a, 13b-second intermediate calender rolls, the 14-back of the body is paid bearing (Backing Bearing), 15-roller amount of deflection mechanism (AS-U), 16-backing roll, 21-input side exact shape, 31-outlet side exact shape, the 41-true form, 50-presets arithmetic unit, the control arithmetic unit falls in the 60-limit, control falls in 70-shape control arithmetic unit, 80-limit could decision maker, the 90-first intermediate calender rolls AS-U position control.

The specific embodiment

Below, by illustrated embodiment, describe multi-roll mill of the present invention and control method thereof in detail,, at first, become the milling train of application of the present invention herein, get final product so long as possess the reversible multi-roll mill of intermediate calender rolls in the behind of working roll.

In addition,, 12 roller mills and 20 roller mills are arranged, but in the following embodiments, illustrate and in 20 roller mills, used example of the present invention as the representational milling train of this multi-roll mill.

Fig. 1 is an one embodiment of the present invention, as mentioned above, be to have used embodiments of the present invention in 20 roller mills, owing to be reversible milling train at this moment, every mill train (pass) switches rolling direction, but in this Fig. 1, represented the rolling from left to right situation that is rolled material 1 for simplification, therefore in the figure, the left side is the input side of milling train, the right side is an outlet side, and the integral body of 20 roller mills is represented with R herein.

Herein, at first, input side and outlet side at this 20 roller mill R, possess input side profile detector 2 and outlet side profile detector 3 that the thickness of slab of the thickness of slab of measuring the width center be rolled material 1 and plate end and plate width direction distributes, and then, possesses the SHAPE DETECTION device 4 of measuring the shape that is rolled material 1 at outlet side.

In addition, this 20 roller mill R comprises: working roll 11a, 11b; Its 2 first intermediate calender rolls 12a, 12b behind; Support 3 second intermediate calender rolls 13a, the 13b of this first intermediate calender rolls 12a, 12b; 4 back ofs the body that possess the roller convex surface guiding mechanism 15 that is called as AS-U are paid bearing 14; 4 identical therewith backing rolls 16.

At this moment, as shown in Figures 2 and 3, these first intermediate calender rolls 12a, 12b are provided with taper.In addition, this taper is implemented at the two ends of roller, and a side is relatively more slow taper 121a, the 121b that is used to carry out shape control, and the opposing party is used for steeper taper 122a, the 122b that control falls in the limit.

In addition, these first intermediate calender rolls 12a, 12b constitute can be up and down displacement in the axial direction independently, in the displacement at this moment, separately axially on have stroke more than 170～200mm.In addition, the shift position of these first intermediate calender rolls 12a, 12b will be described in detail in the back, but constitute by the first intermediate calender rolls AS-U position control 90, up and down control independently.

Therefore, before each rolling beginning of mill train (repeatedly rolling), at first preset calculating, judge which control in control and the shape control falls in the limit.

Then, fall under the situation of control on the execution limit, as shown in Figure 2, each shift position of the first intermediate calender rolls 12a, 12b is set, taper 122a, the 122b that makes the limit fall control usefulness is in the position of the inboard of the plate end that is rolled material 1 or plate end, and taper 121a, the 121b of shape control usefulness are positioned at the outside of plate end.

In addition, under the situation of carrying out shape control, as shown in Figure 3, the shift position is set, taper 121a, the 121b that makes shape control usefulness is in the plate end that is rolled material 1 or in the inboard of plate end, the outside that the taper 122a, the 122b that control usefulness are positioned at the plate end falls in the limit.

Therefore, according to present embodiment, as mentioned above, by changing the shift position of the first intermediate calender rolls 12a, 12b, the control function that first intermediate calender rolls is carried out can be switched to the limit and fall control and shape control, can more not carry out the both sides that control and shape control fall in the limit under the situation of roll change.

In addition, in the present embodiment, fall when control carrying out the limit, also use the AS-U of shape control usefulness.Promptly, according to input side exact shape 21 and outlet side exact shape 31, the control arithmetic unit 60 computings first intermediate calender rolls shift amount falls in the limit, operational order is exported to the first intermediate calender rolls AS-U position control 90, operate the first intermediate calender rolls shift position, but this moment will be in order to be suppressed at Min. because of the influence to shape that intermediate calender rolls displacement is caused, and the 15 output revision directives of pair roller convex surface guiding mechanism.

On the other hand, under the situation of implementing shape control, the first intermediate calender rolls 12a, 12b are shifted based on the instruction of shape control, arrive position shown in Figure 3.Therefore, do not carry out the limit this moment and fall control.

At this moment, the limit fall control could decision maker 80 judge that the output of control falls in limits could.Therefore, supervision outlet side true form 41 in the control is fallen on the limit, shape become that extreme plate end stretches or the situation of the shape of extreme plate end elongation under because the first intermediate calender rolls 12a, 12b be at the direction superior displacement that encourages it, thus judge that control falls in the limit could.

So, implement the different taper of purpose, can distinguish the limit and fall control and shape control by two ends at the first intermediate calender rolls 12a, 12b, consequently, although adopted same intermediate calender rolls,, also can carry out the both sides that control and shape control fall in the limit according to present embodiment.

Therefore,,, consequently, in rolling, do not need to change intermediate calender rolls, so the abundant quality of item that improves under the productive situation can not damaged owing to can adopt same intermediate calender rolls to carry out the both sides that control and shape control fall in the limit according to present embodiment.

Below, preset the computing of presetting that arithmetic unit 50 carried out with reference to Fig. 4 explanation.As described in present embodiment, when adopting reversible mill, before rolling beginning, carry out the setting of thickness of slab or tension force etc. and calculate, it is wide etc. to set mill train quantity, thickness of slab, plate thus.Therefore, preset arithmetic unit 50 and retrieve setting table 52, carry out the selection of control mode and handle 51 by these set informations.This moment, the operator also can manually select control mode.

Then, based on the control mode of selecting, but determine position and the initial position of AS-U position and the shift range of first intermediate calender rolls that first intermediate calender rolls is shifted.With regard to the setting of initial position at this moment,, also can be set in the plate end position as long as the taper starting point is inboard about 0～100mm of the plate end that is rolled material.

, fall under the situation of control carrying out the limit herein, at first, carry out the limit and fall control, determine to make the limit to fall the position that the taper starting point of controlling usefulness reaches the inboard Xmm of position identical with the plate end or plate end with presetting computing 53.The value of X can be retrieved from setting table 531 and set, and also can measure the profile of input side and obtains from the multinomial of its limit amount of falling.And then also can be set at fixed value singlely, the mill train before is that the limit falls under the situation of control, the shift position the when mill train before also can keeping finishes.

In addition, when carrying out shape control, carry out shape control, determine that the shift position makes the shape control of the intermediate calender rolls of winning arrive the Ymm inboard of plate end with the taper starting point with presetting computing 54.This moment, the value of Y can retrieval from set table 541, or was under the situation of shape control at mill train before, the value the when mill train before also can keeping finishes.

Then, based on the described result who presets computing, carry out the first intermediate calender rolls shift position and set processing 56, the shift position with first intermediate calender rolls before rolling is operating as setting value.In addition, under the situation that in rolling, needs shape control, operate the displacement of first intermediate calender rolls based on the instruction of shape control.

Then, illustrate that with reference to Fig. 5 the processing that control arithmetic unit 60 is carried out falls in the limit.Fall when control carrying out this limit, FEEDFORWARD CONTROL operational part 61 and FEEDBACK CONTROL operational part 64 are based on input side exact shape of measuring 21 and 31 work of outlet side exact shape.The FEEDFORWARD CONTROL amount of this moment and FEEDBACK CONTROL amount are by several 1 and several 2 computings.

[several 1]

Several 1 Δ Sed _FB=(EDR-EDFB) * G _FB* ED (x) * tan (α)

[several 2]

Several 2 $\mathrm{\Δ}{\mathrm{Sed}}_{\mathrm{FF}}=\frac{d}{\mathrm{dt}}(\mathrm{EDR}-\mathrm{EDFF})\×G_{\mathrm{FF}}\×\mathrm{ED}\left(x\right)\×\tan \left(\mathrm{\α}\right)$

Wherein, Δ Sed _FBBe the first intermediate calender rolls shift amount, the Δ Sed of FEEDBACK CONTROL _FFThe first intermediate calender rolls shift amount, the EDR that is FEEDFORWARD CONTROL is that desired value falls in the limit, EDFB is that the output side amount of falling, EDFF are the input side amount of falling, G _FBAnd G _FFBe that ride gain, ED (x) are that transferring rate, the x of intermediate calender rolls taper is that distance, the α that measuring point and taper starting point fall in the limit is the angle of taper of first intermediate calender rolls.

Be set at operator's side active side WS, driving side be set at driving side DS this moment, and they are carried out same calculating, by several 3, obtains the first intermediate calender rolls shift amount Δ SedWS, the Δ SedDS that fall control instruction as the limit.

[several 3]

Several 3 $\left\{\begin{array}{c}\mathrm{\ΔSedWS}=\mathrm{\Δ}{\mathrm{Sed}}_{\mathrm{FF}-\mathrm{WS}}+\mathrm{\Δ}{\mathrm{Sed}}_{\mathrm{FB}-\mathrm{WS}}\\ \mathrm{\ΔSedDS}=\mathrm{\Δ}{\mathrm{Sed}}_{\mathrm{FF}-\mathrm{DS}}+\mathrm{\Δ}{\mathrm{Sed}}_{\mathrm{FB}-\mathrm{DS}}\end{array}\right.$

In addition, control instruction Δ SedWS, Δ SedDS fall in the limit of herein obtaining, after having checked shift amount and direction of displacement, export to by inspection body 67 limit control is fallen and could decision maker 80.

Fall in the control on the limit this moment as mentioned above, in operation during first intermediate calender rolls, revise the AS-U position make outlet side the plate shape be changed to minimum, the AS-U correction of this moment adopts several 4 by 68 computings of AS-U position correction amount operational part.

[several 4]

Several 4 Δ ASUed (i)=Δ SedWS * ρ ws (i)+Δ Δ SedDS * ρ ds (i)

Wherein, ρ ws (i), ρ ds (i) are respectively the first intermediate calender rolls shift amount of active side WS and driving side DS and the influence coefficient of i AS-U position, are as constant and default value.In addition, the AS-U position correction amount Δ ASUed (i) that herein obtains also via inspection body 67 export to the limit control is fallen and could decision maker 80.

At this moment, fall control on this limit and be provided with input side profile influence coefficient table 62 and influence coefficient study portion 63 in the arithmetic unit 60, thus based on input side exact shape 21 and outlet side exact shape 31 and the result of study can be used in the computing that FEEDFORWARD CONTROL operational part 61 is carried out.

In addition, same, fall in the control arithmetic unit 60 on this limit and also to be provided with outlet side profile influence coefficient table 65 and influence coefficient study portion 66, thus based on outlet side exact shape 31 and the result of study can be used in the computing that FEEDBACK CONTROL operational part 64 is carried out.

Fig. 6 is that expression is implemented the limit of limit when falling control and fallen the figure that the flow process of the calculation process that control could decision maker 80 be carried out falls in control arithmetic unit 60 and shape control arithmetic unit 70 and limit, and Fig. 7 is the figure of an example of the limit of the expression this moment the simplest handling process of falling that control could decision maker 80.

As shown in the figure, control falls in the limit could compare the actual plate shape 41 of the outlet side of being measured by outlet side SHAPE DETECTION device 4 and the target shape of setting by target shape setting device 42 by decision maker 80, to the form variations Δ ε of active side WS and driving side DS operation board end.

In addition, according to the value of the first intermediate calender rolls shift instruction Δ Sed and form variations Δ ε, according to handling process shown in Figure 7, respectively active side WS and driving side DS being judged that the output of control falls in the limit could.The true form of form variations Δ ε display plate end and target shape is poor at this moment, if it for just, then becomes the direction of elongation.

In addition, in Fig. 7, ε P is the higher limit of form variations Δ ε, and herein, ε has surpassed under the situation of higher limit at this Δ, becomes the processing that does not make first intermediate calender rolls be displaced to the outside.Equally, ε N is the lower limit of form variations Δ ε, and ε is lower than under the situation of lower limit ε N at this Δ, becomes not make first intermediate calender rolls be displaced to inboard processing.

From above result as can be known, according to present embodiment, the true form that monitors outlet side in the control is fallen on the limit, the shape of plate end become that plate end extremely stretches or the situation of plate end elongation under, stop the interlock that control falls in the limit and start working.

Therefore, according to present embodiment, can on one side form variations be remained in certain scope, Yi Bian utilize the displacement of first intermediate calender rolls to make the limit fall control work, in addition, according to present embodiment, can in a plurality of mill traines, carry out the limit at its first half and fall control, control in the latter half of shape of carrying out, therefore, can guarantee the precision of shape, must arrive the limit simultaneously and fall control.

Claims (4)

1. multi-roll mill, it possesses 2 intermediate calender rolls at each working roll at least, it is characterized in that,

Described intermediate calender rolls possesses shape respectively in a side end and the opposing party's the different taper in end,

Described intermediate calender rolls clips and is rolled material, and about conical in shape dispose symmetrically a side and the opposing party,

Described intermediate calender rolls remains can be at axial superior displacement separately.

2. multi-roll mill as claimed in claim 1 is characterized in that,

The conical in shape of one side's of described intermediate calender rolls end is that the limit falls control use conical in shape, the conical in shape of the opposing party's end be that shape is controlled and to be used conical in shape.

3. the control method of a multi-roll mill, described multi-roll mill possesses 2 intermediate calender rolls at each working roll at least, described intermediate calender rolls possesses shape in a side end and the opposing party's the different taper in end, described intermediate calender rolls clips and is rolled material, and about conical in shape dispose symmetrically a side and the opposing party, these intermediate calender rolls remain can be at axial superior displacement separately, and the control method of this multi-roll mill is characterised in that

In the per pass rolling process, judgement is to implement the limit to fall control, still implements shape control,

Before rolling beginning, according to the shift position of the described intermediate calender rolls of each control change.

4. the control method of multi-roll mill as claimed in claim 3 is characterized in that,

Outlet side at rolling process possesses the SHAPE DETECTION device of measuring the shape that is rolled material,

According to the measurement result of described SHAPE DETECTION device, judge whether to implement described limit and fall control.

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