CA2743400C - Method for providing at least one work roll for rolling rolling stock - Google Patents
Method for providing at least one work roll for rolling rolling stock Download PDFInfo
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- CA2743400C CA2743400C CA2743400A CA2743400A CA2743400C CA 2743400 C CA2743400 C CA 2743400C CA 2743400 A CA2743400 A CA 2743400A CA 2743400 A CA2743400 A CA 2743400A CA 2743400 C CA2743400 C CA 2743400C
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- roll
- work
- rolling
- rolling stock
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/021—Rolls for sheets or strips
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
- B21B13/142—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls by axially shifting the rolls, e.g. rolls with tapered ends or with a curved contour for continuously-variable crown CVC
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/021—Rolls for sheets or strips
- B21B2027/022—Rolls having tapered ends
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2263/00—Shape of product
- B21B2263/02—Profile, e.g. of plate, hot strip, sections
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2263/00—Shape of product
- B21B2263/04—Flatness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2263/00—Shape of product
- B21B2263/04—Flatness
- B21B2263/06—Edge waves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2267/00—Roll parameters
- B21B2267/02—Roll dimensions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2267/00—Roll parameters
- B21B2267/18—Roll crown; roll profile
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2269/00—Roll bending or shifting
- B21B2269/12—Axial shifting the rolls
- B21B2269/14—Work rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2271/00—Mill stand parameters
- B21B2271/02—Roll gap, screw-down position, draft position
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Control Of Metal Rolling (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Grinding Of Cylindrical And Plane Surfaces (AREA)
Abstract
The invention relates to a method for providing at least one work roll (1, 2) for rolling strip-shaped rolling stock (3), wherein the work roll (1, 2) is provided to interact with a second roll (4, 5), particularly with an intermediate or backup roller and be supported by said second roll, wherein the second roll (4, 5) has a background area (6) in the axial end regions thereof. In order to improve the quality of a rolled strip, the method according to the invention provides the following steps: a) calculating the roll nip profile resulting between two interacting work rolls (1, 2), wherein a defined width of the rolling stock (3) is assumed, which extends at least partially into the region of the background area (6) of the second roll (4, 5); b) defining a desired rolling stock contour that is to be created by the rolling process when passing the work rolls (1, 2); c) calculating a compensation cut for the work roll (1, 2) by subtracting the defined rolling stock contour according to step b) from the roll nip profile according to step a) and multiplying the calculated difference with a damping factor (K); d) at least partially applying the compensation cut calculated according to step c) to at least one work roll (1, 2).
Description
WO 2010/118,862 PCT/EP2010/002,302 METHOD FOR PROVIDING AT LEAST ONE WORK ROLL
FOR ROLLING ROLLING STOCK
The invention concerns a method for preparing at least one work roll for the rolling of preferably strip-shaped rolling stock, wherein the work roll is provided to interact with a second roll, especially an intermediate roll or backup roll, and to be supported by this roll, and wherein the axial end regions of the second roll have a setback.
In particular, when very wide plate is being rolled (e.g., width greater than 3,000 mm), undesired profile shapes sometimes develop in the strip, especially W-shaped profiles and ridge formation near the edges and flatness defects (quarter waves) in the final product.
This can be attributed, among other things, to the fact that during the rolling of wide strips or plates it happens that the outer regions of the rolling stock are located in the area of the setback of the backup rolls or intermediate rolls or, in the case of extended work rolls, actually lie outside the edges of the barrels of the backup rolls or intermediate rolls. The work roll bends back in these regions, and as a result of this, a nonparabolic profile shape can develop in the roll gap, namely, e.g., the aforementioned ridge WO 2010/118,862 A9 PCT/EP2010/002,302 formation. High rolling forces and work roll bending forces can intensify this effect.
The rolling stock profile is the distribution of the thickness of the rolling stock over its width. Rolling stock profiles that deviates greatly from the parabolic form are generally undesirable, since they can lead to nonflatness in the rolling process or in the downstream processes. In addition, the accuracy to gage of the product can be adversely affected.
The application of roll cuts to work rolls for systematically affecting the roll gap profile is already known. For example, EP 0 294 544 B1 provides that the work roll is provided with a profile that is described by a polynomial. EP 1 307 302 B1 proposes a similar solution, in which a so-called CVC profile is provided. Other similar and different solutions are disclosed in EP 1 703 999 B1, EP 0 937 515 B1, JP 3032412 A, JP 9253726 A, DE 39 19 285 Al, JP
8332509 A, JP 6015322 A, and JP 2179308 A. The profiles applied on the work roll are thus parabolic contours or contours described by polynomials. In the latter case, when an axial work roll shifter is present and shifting is used as a profile correcting element, the S-shaped contours described WO 2010/118,862 A9 PCT/EP2010/002,302 by the aforesaid polynomials are applied to the roll (CVC
cut).
The application of special contours to reduce edge drop or to reduce ridge formation is also well known. The goal here is to influence the rolling stock profile contour in the immediate edge region in order to compensate effects of work roll flattening in the roll gap or of thermal expansion of the work roll on the roll gap profile.
The prior art cited above does not provide practical advice on how good rolling results can be achieved despite furnishing backup rolls or intermediate rolls with a setback.
But this is precisely why the aforementioned problems occur, especially in the case of very wide strips.
Therefore, the objective of the invention is to propose a method for preparing a work roll of the type described at the beginning, with which it is possible, even when there is a corresponding setback of the backup roll or intermediate roll, to achieve optimum rolling, i.e., to roll a strip that is characterized by high quality and the desired shape.
Accordingly, undesirable nonparabolic effects of the backup roll or intermediate roll setback on the roll gap profile shape are to be largely compensated. The provision of the WO 2010/118,862 A9 PCT/EP2010/002,302 work rolls with a special cut (e.g., CVC cut) should not be compromised.
The solution to this problem by the invention is characterized in that the method for preparing at least one work roll for the rolling of preferably strip-shaped rolling stock has the following steps:
(a) computation of the roll gap profile that is formed between two interacting work rolls, where a defined width of the rolling stock is assumed, which extends at least partially into the region of the setback of the second roll;
(b) definition of a desired rolling stock contour that is to be produced by the rolling process during passage through the work rolls;
(c) computation of a compensation cut for the work roll by subtraction of the rolling stock contour defined according to step (b) from the roll gap profile according to step (a) and multiplication of the computed difference by a damping factor;
(d) at least proportional application of the compensation cut computed according to step (c) to at least one work roll.
The compensation cut according to step (c) can be superimposed on another profiling of the work roll. This WO 2010/118,862 A9 PCT/EP2010/002,302 other profiling of the work roll is preferably a parabolic profiling or an S-shaped profiling (so-called CVC profiling).
The damping factor for the computation according to step (c) is preferably 0.3-0.9 and more preferably 0.4-0.8. A
value of 0.6 has been found to be especially effective. The factor is chosen in such a way that for the broad strips or products, ridge-shaped profile forms no longer arise or the ridges are greatly reduced, and for narrower dimensions of the strip, no disturbing effects or only slightly disturbing effects arise.
In accordance with a preferred embodiment, the computation according to step (a) is based on the maximum width provided for the rolling stock that is to be rolled with the work rolls.
The computation according to step (a) is preferably based on a well-defined rolling force and a well-defined work roll bending force. The definition according to step (b) is preferably based on the same parameters as in step (a).
It is advantageous for the profile that is to be defined in accordance with step (b) to be based on a roll gap profile computed offline. In this case, it can be provided that the roll gap profile computed offline is based on an extended WO 2010/118,862 A9 PCT/EP2010/002,302 backup roll barrel, so that the edges of the rolling stock are not located in the region of the setback of the second rolls.
Accordingly, the proposed method provides a work roll cut to compensate the bending behavior of the work roll in the region of the backup roll setback. A possibly desired special roll cut (e.g., a CVC cut) is superimposed on the compensation cut provided in accordance with the invention.
An essential feature of the proposed cut is that the effect of the setback compensation is almost independent of the axial shift position of the work rolls to each other, so that in the case of shiftability of the work rolls, this effect is effective over the entire shift range.
The compensation cut can be used both on work rolls that can be axially shifted and on work rolls that cannot be shifted.
It can be proportionally applied to only one work roll or to the upper and the lower work roll.
The compensation cut can be combined with any desired roll cut, i.e., it can be superimposed on it. The height of the cut can be varied according to the current work roll diameter. The height can also be adapted to the current backup roll contour or intermediate roll contour (with respect WO 2010/118,862 A9 PCT/EP2010/002,302 to wear).
The cut can be described, for example, by a sequence of points or by a mathematical function (e.g., by a polynomial function).
The drawings illustrate a specific embodiment of the invention.
-- Figure 1 is a schematic drawing of the work rolls and backup rolls of a four-high rolling stand during the rolling of strip-shaped rolling stock, viewed in the direction of rolling.
-- Figure 2 shows the variation of the roll gap, i.e., the height of the roll gap over the width less the height in the center, between two work rolls over the width of the rolling stock during the rolling of the rolling stock without the use of the method of the invention.
-- Figure 3 shows the variation of the roll gap between two work rolls over the width of the rolling stock as a target contour (ideal profile shape).
-- Figure 4 shows the variation of the roll gap between the work rolls over the width of the rolling stock as the difference contour between the target contour according to Figure 3 and the variation according to Figure 2.
WO 2010/118,862 A9 PCT/EP2010/002,302 -- Figure 5 shows the variation of a compensation cut for the work rolls over the width of the rolling stock.
-- Figure 6 shows the effect of the compensation cut (supplementary cut) over the width of the rolling stock for different axial shift positions on the unloaded roll gap.
-- Figure 7 shows the variation of the roll gap between two work rolls over the width of the rolling stock with the use of the compensation cut according to Figure 5.
Figure 1 shows two work rolls 1, 2, which are part of a four-high rolling stand (which itself is not shown). The work rolls 1, 2 are supported in a well-known way by backup rolls 4, 5. The rolling stock 3 that is to be rolled, which in the present case is a strip with a width B of 3,100 mm, is located between the work rolls 1, 2.
In their lateral regions, i.e., their axial end regions, the backup rolls 4, 5 have a setback 6, i.e., the profile is set back compared to a pure cylinder. In Figure 1 this is shown with strong exaggeration.
Accordingly, for the embodiment illustrated here, this has the following consequence: Full support of the work rolls 1, 2 by the backup rolls 4, 5 is provided only in the middle region over a distance of 2,050 mm, since each setback 6 in WO 2010/118,862 A9 PCT/EP2010/002,302 the two lateral regions extends over a distance of 500 mm.
The work rolls, which have a length of 3,450 mm, extend beyond the width B of the rolling stock 3 of 3,100 mm.
The work rolls 1, 2 are acted upon not only by the support forces of the backup rolls 4, 5 but also by work roll bending forces FB and the rolling forces themselves, so that the work rolls experience reverse bending, which is indicated by the arrows 7.
The reverse bending of the work rolls in the area of the setback 6 of the backup rolls thus depends on the rolled width of the rolling stock 3, the rolling force that is applied, and the work roll bending force FB that is set. Therefore, the choice of a frequently rolled large width of the rolling stock and of a mean rolling force that is customary for the last passes of a pass program and a bending force (balancing force) at a low level are advantageous for the cut configuration. In this regard, we can initially proceed from average roll diameters. The roll cambers are chosen in each case in such a way that the computed roll gap profiles fall within the usual range (about 0.000 mm to 0.200 mm).
In a first step of the work roll configuration or preparation, the roll gap profile to be expected is computed WO 2010/118,862 A9 PCT/EP2010/002,302 for the rolling stand to be considered under the aforesaid boundary conditions for the maximum width to be rolled. An example of the result of such a computation is shown in Figure 2. Here we see the shape of the roll gap profile for a rolling stock width of 3,100 mm without compensation of the reverse bending effect. It is clearly seen that the profile takes an undesired course in the lateral region of the strip due to the reverse bending of the work rolls.
After this profile has been determined, an ideal rolling stock contour is defined for the same case. This can be, for example, a roll gap profile computed offline under the assumption of an extended backup roll barrel, so that the edges of the rolling stock are not located in the area of the setback 6 of the backup rolls. This ideal profile shape is shown in Figure 3 as an example of a target contour, again for a strip with a width of 3,100 mm.
In the next step, the undesired profile component produced by the reverse bending effect is determined by subtracting the target contour (according to Figure 3) from the roll gap shape without compensation cut (according to Figure 2). This is illustrated in Figure 4. Sketched here is thus the difference contour between the target contour and the WO 2010/118,862 A9 PCT/EP2010/002,302 roll gap shape without compensation, again for a strip with a width of 3,100 mm. The solid curve is the roll gap shape without compensation cut, while the dot-dash curve indicates the target contour. Accordingly, the broken curve represents the difference contour that is needed to compensate the reverse bending effect.
The compensation cut for the work roll is obtained by the difference contour according to Figure 4, where the difference that is determined is multiplied by a damping factor K of, e.g., 0.7. This factor is chosen in such a way that in the case of broad strips, ridge-shaped profile forms do not arise, while in the case of narrower dimensions of the strip, no disturbing effects or only slightly disturbing effects arise.
The compensation cut for application to both work rolls 1, 2 is shown in Figure 5. The graph shows the radius deviation (ar) over the barrel length.
If the compensation cut is to be applied to only one work roll, its height is doubled accordingly.
In the region near the rolling stock towards the edges of the barrel, the contour should run out harmonically, as is indicated in Figure 5 with reference number 8.
The effect of the supplementary cut on the unloaded roll WO 2010/118,862 A9 PCT/EP2010/002,302 gap is illustrated in Figure 6 for different axial shift positions. The solid line indicates the curve that is obtained with work rolls 1, 2 that have not been axially shifted. On the other hand, the broken line shows the curve that is obtained when the upper and lower work rolls are shifted relative to each other by 150 mm. Figure 6 thus shows the effect on the unloaded roll gap as a function of the axial shift position. It is apparent that even in the case of a relatively large axial shift of the rolls, the desired effect remains largely constant.
Finally, Figure 7 shows the resultant roll gap shape obtained with the use of the compensation cut. The improvement that is realized in the profile shape is apparent from a comparison of this contour with the original contour without compensation cut according to Figure 2.
When a six-high rolling stand is used instead of the four-high rolling stand illustrated here, similar results are obtained, but in this case the backup roll is replaced by the intermediate roll.
WO 2010/118,862 A9 PCT/EP2010/002,302 List of Reference Numbers and Letters 1 work roll 2 work roll 3 rolling stock 4 second roll (intermediate roll, backup roll) second roll (intermediate roll, backup roll) 6 setback 7 bending direction (reverse bending of work roll) 8 harmonic runout B width of the rolling stock K damping factor FB work roll bending force
FOR ROLLING ROLLING STOCK
The invention concerns a method for preparing at least one work roll for the rolling of preferably strip-shaped rolling stock, wherein the work roll is provided to interact with a second roll, especially an intermediate roll or backup roll, and to be supported by this roll, and wherein the axial end regions of the second roll have a setback.
In particular, when very wide plate is being rolled (e.g., width greater than 3,000 mm), undesired profile shapes sometimes develop in the strip, especially W-shaped profiles and ridge formation near the edges and flatness defects (quarter waves) in the final product.
This can be attributed, among other things, to the fact that during the rolling of wide strips or plates it happens that the outer regions of the rolling stock are located in the area of the setback of the backup rolls or intermediate rolls or, in the case of extended work rolls, actually lie outside the edges of the barrels of the backup rolls or intermediate rolls. The work roll bends back in these regions, and as a result of this, a nonparabolic profile shape can develop in the roll gap, namely, e.g., the aforementioned ridge WO 2010/118,862 A9 PCT/EP2010/002,302 formation. High rolling forces and work roll bending forces can intensify this effect.
The rolling stock profile is the distribution of the thickness of the rolling stock over its width. Rolling stock profiles that deviates greatly from the parabolic form are generally undesirable, since they can lead to nonflatness in the rolling process or in the downstream processes. In addition, the accuracy to gage of the product can be adversely affected.
The application of roll cuts to work rolls for systematically affecting the roll gap profile is already known. For example, EP 0 294 544 B1 provides that the work roll is provided with a profile that is described by a polynomial. EP 1 307 302 B1 proposes a similar solution, in which a so-called CVC profile is provided. Other similar and different solutions are disclosed in EP 1 703 999 B1, EP 0 937 515 B1, JP 3032412 A, JP 9253726 A, DE 39 19 285 Al, JP
8332509 A, JP 6015322 A, and JP 2179308 A. The profiles applied on the work roll are thus parabolic contours or contours described by polynomials. In the latter case, when an axial work roll shifter is present and shifting is used as a profile correcting element, the S-shaped contours described WO 2010/118,862 A9 PCT/EP2010/002,302 by the aforesaid polynomials are applied to the roll (CVC
cut).
The application of special contours to reduce edge drop or to reduce ridge formation is also well known. The goal here is to influence the rolling stock profile contour in the immediate edge region in order to compensate effects of work roll flattening in the roll gap or of thermal expansion of the work roll on the roll gap profile.
The prior art cited above does not provide practical advice on how good rolling results can be achieved despite furnishing backup rolls or intermediate rolls with a setback.
But this is precisely why the aforementioned problems occur, especially in the case of very wide strips.
Therefore, the objective of the invention is to propose a method for preparing a work roll of the type described at the beginning, with which it is possible, even when there is a corresponding setback of the backup roll or intermediate roll, to achieve optimum rolling, i.e., to roll a strip that is characterized by high quality and the desired shape.
Accordingly, undesirable nonparabolic effects of the backup roll or intermediate roll setback on the roll gap profile shape are to be largely compensated. The provision of the WO 2010/118,862 A9 PCT/EP2010/002,302 work rolls with a special cut (e.g., CVC cut) should not be compromised.
The solution to this problem by the invention is characterized in that the method for preparing at least one work roll for the rolling of preferably strip-shaped rolling stock has the following steps:
(a) computation of the roll gap profile that is formed between two interacting work rolls, where a defined width of the rolling stock is assumed, which extends at least partially into the region of the setback of the second roll;
(b) definition of a desired rolling stock contour that is to be produced by the rolling process during passage through the work rolls;
(c) computation of a compensation cut for the work roll by subtraction of the rolling stock contour defined according to step (b) from the roll gap profile according to step (a) and multiplication of the computed difference by a damping factor;
(d) at least proportional application of the compensation cut computed according to step (c) to at least one work roll.
The compensation cut according to step (c) can be superimposed on another profiling of the work roll. This WO 2010/118,862 A9 PCT/EP2010/002,302 other profiling of the work roll is preferably a parabolic profiling or an S-shaped profiling (so-called CVC profiling).
The damping factor for the computation according to step (c) is preferably 0.3-0.9 and more preferably 0.4-0.8. A
value of 0.6 has been found to be especially effective. The factor is chosen in such a way that for the broad strips or products, ridge-shaped profile forms no longer arise or the ridges are greatly reduced, and for narrower dimensions of the strip, no disturbing effects or only slightly disturbing effects arise.
In accordance with a preferred embodiment, the computation according to step (a) is based on the maximum width provided for the rolling stock that is to be rolled with the work rolls.
The computation according to step (a) is preferably based on a well-defined rolling force and a well-defined work roll bending force. The definition according to step (b) is preferably based on the same parameters as in step (a).
It is advantageous for the profile that is to be defined in accordance with step (b) to be based on a roll gap profile computed offline. In this case, it can be provided that the roll gap profile computed offline is based on an extended WO 2010/118,862 A9 PCT/EP2010/002,302 backup roll barrel, so that the edges of the rolling stock are not located in the region of the setback of the second rolls.
Accordingly, the proposed method provides a work roll cut to compensate the bending behavior of the work roll in the region of the backup roll setback. A possibly desired special roll cut (e.g., a CVC cut) is superimposed on the compensation cut provided in accordance with the invention.
An essential feature of the proposed cut is that the effect of the setback compensation is almost independent of the axial shift position of the work rolls to each other, so that in the case of shiftability of the work rolls, this effect is effective over the entire shift range.
The compensation cut can be used both on work rolls that can be axially shifted and on work rolls that cannot be shifted.
It can be proportionally applied to only one work roll or to the upper and the lower work roll.
The compensation cut can be combined with any desired roll cut, i.e., it can be superimposed on it. The height of the cut can be varied according to the current work roll diameter. The height can also be adapted to the current backup roll contour or intermediate roll contour (with respect WO 2010/118,862 A9 PCT/EP2010/002,302 to wear).
The cut can be described, for example, by a sequence of points or by a mathematical function (e.g., by a polynomial function).
The drawings illustrate a specific embodiment of the invention.
-- Figure 1 is a schematic drawing of the work rolls and backup rolls of a four-high rolling stand during the rolling of strip-shaped rolling stock, viewed in the direction of rolling.
-- Figure 2 shows the variation of the roll gap, i.e., the height of the roll gap over the width less the height in the center, between two work rolls over the width of the rolling stock during the rolling of the rolling stock without the use of the method of the invention.
-- Figure 3 shows the variation of the roll gap between two work rolls over the width of the rolling stock as a target contour (ideal profile shape).
-- Figure 4 shows the variation of the roll gap between the work rolls over the width of the rolling stock as the difference contour between the target contour according to Figure 3 and the variation according to Figure 2.
WO 2010/118,862 A9 PCT/EP2010/002,302 -- Figure 5 shows the variation of a compensation cut for the work rolls over the width of the rolling stock.
-- Figure 6 shows the effect of the compensation cut (supplementary cut) over the width of the rolling stock for different axial shift positions on the unloaded roll gap.
-- Figure 7 shows the variation of the roll gap between two work rolls over the width of the rolling stock with the use of the compensation cut according to Figure 5.
Figure 1 shows two work rolls 1, 2, which are part of a four-high rolling stand (which itself is not shown). The work rolls 1, 2 are supported in a well-known way by backup rolls 4, 5. The rolling stock 3 that is to be rolled, which in the present case is a strip with a width B of 3,100 mm, is located between the work rolls 1, 2.
In their lateral regions, i.e., their axial end regions, the backup rolls 4, 5 have a setback 6, i.e., the profile is set back compared to a pure cylinder. In Figure 1 this is shown with strong exaggeration.
Accordingly, for the embodiment illustrated here, this has the following consequence: Full support of the work rolls 1, 2 by the backup rolls 4, 5 is provided only in the middle region over a distance of 2,050 mm, since each setback 6 in WO 2010/118,862 A9 PCT/EP2010/002,302 the two lateral regions extends over a distance of 500 mm.
The work rolls, which have a length of 3,450 mm, extend beyond the width B of the rolling stock 3 of 3,100 mm.
The work rolls 1, 2 are acted upon not only by the support forces of the backup rolls 4, 5 but also by work roll bending forces FB and the rolling forces themselves, so that the work rolls experience reverse bending, which is indicated by the arrows 7.
The reverse bending of the work rolls in the area of the setback 6 of the backup rolls thus depends on the rolled width of the rolling stock 3, the rolling force that is applied, and the work roll bending force FB that is set. Therefore, the choice of a frequently rolled large width of the rolling stock and of a mean rolling force that is customary for the last passes of a pass program and a bending force (balancing force) at a low level are advantageous for the cut configuration. In this regard, we can initially proceed from average roll diameters. The roll cambers are chosen in each case in such a way that the computed roll gap profiles fall within the usual range (about 0.000 mm to 0.200 mm).
In a first step of the work roll configuration or preparation, the roll gap profile to be expected is computed WO 2010/118,862 A9 PCT/EP2010/002,302 for the rolling stand to be considered under the aforesaid boundary conditions for the maximum width to be rolled. An example of the result of such a computation is shown in Figure 2. Here we see the shape of the roll gap profile for a rolling stock width of 3,100 mm without compensation of the reverse bending effect. It is clearly seen that the profile takes an undesired course in the lateral region of the strip due to the reverse bending of the work rolls.
After this profile has been determined, an ideal rolling stock contour is defined for the same case. This can be, for example, a roll gap profile computed offline under the assumption of an extended backup roll barrel, so that the edges of the rolling stock are not located in the area of the setback 6 of the backup rolls. This ideal profile shape is shown in Figure 3 as an example of a target contour, again for a strip with a width of 3,100 mm.
In the next step, the undesired profile component produced by the reverse bending effect is determined by subtracting the target contour (according to Figure 3) from the roll gap shape without compensation cut (according to Figure 2). This is illustrated in Figure 4. Sketched here is thus the difference contour between the target contour and the WO 2010/118,862 A9 PCT/EP2010/002,302 roll gap shape without compensation, again for a strip with a width of 3,100 mm. The solid curve is the roll gap shape without compensation cut, while the dot-dash curve indicates the target contour. Accordingly, the broken curve represents the difference contour that is needed to compensate the reverse bending effect.
The compensation cut for the work roll is obtained by the difference contour according to Figure 4, where the difference that is determined is multiplied by a damping factor K of, e.g., 0.7. This factor is chosen in such a way that in the case of broad strips, ridge-shaped profile forms do not arise, while in the case of narrower dimensions of the strip, no disturbing effects or only slightly disturbing effects arise.
The compensation cut for application to both work rolls 1, 2 is shown in Figure 5. The graph shows the radius deviation (ar) over the barrel length.
If the compensation cut is to be applied to only one work roll, its height is doubled accordingly.
In the region near the rolling stock towards the edges of the barrel, the contour should run out harmonically, as is indicated in Figure 5 with reference number 8.
The effect of the supplementary cut on the unloaded roll WO 2010/118,862 A9 PCT/EP2010/002,302 gap is illustrated in Figure 6 for different axial shift positions. The solid line indicates the curve that is obtained with work rolls 1, 2 that have not been axially shifted. On the other hand, the broken line shows the curve that is obtained when the upper and lower work rolls are shifted relative to each other by 150 mm. Figure 6 thus shows the effect on the unloaded roll gap as a function of the axial shift position. It is apparent that even in the case of a relatively large axial shift of the rolls, the desired effect remains largely constant.
Finally, Figure 7 shows the resultant roll gap shape obtained with the use of the compensation cut. The improvement that is realized in the profile shape is apparent from a comparison of this contour with the original contour without compensation cut according to Figure 2.
When a six-high rolling stand is used instead of the four-high rolling stand illustrated here, similar results are obtained, but in this case the backup roll is replaced by the intermediate roll.
WO 2010/118,862 A9 PCT/EP2010/002,302 List of Reference Numbers and Letters 1 work roll 2 work roll 3 rolling stock 4 second roll (intermediate roll, backup roll) second roll (intermediate roll, backup roll) 6 setback 7 bending direction (reverse bending of work roll) 8 harmonic runout B width of the rolling stock K damping factor FB work roll bending force
Claims (10)
1. A method for preparing at least one work roll (1, 2) for the rolling of rolling stock (3), wherein the work roll (1, 2) is provided to interact with a second roll (4, 5), especially an intermediate roll or backup roll, and to be supported by this roll, and wherein the axial end regions of the second roll (4, 5) have a setback (6), characterized in that the method has the following steps:
(a) computation of the roll gap profile that is formed between two interacting work rolls (1, 2), where a defined width (B) of the rolling stock (3) is assumed, which extends at least partially into the region of the setback (6) of the second roll (4, 5);
(b) definition of a desired rolling stock contour that is to be produced by the rolling process during passage through the work rolls (1, 2);
(c) computation of a compensation cut for the work roll (1, 2) by subtraction of the rolling stock contour defined according to step (b) from the roll gap profile according to step (a) and multiplication of the computed difference by a damping factor (K);
(d) at least proportional application of the compensation cut computed according to step (c) to at least one work roll (1, 2).
(a) computation of the roll gap profile that is formed between two interacting work rolls (1, 2), where a defined width (B) of the rolling stock (3) is assumed, which extends at least partially into the region of the setback (6) of the second roll (4, 5);
(b) definition of a desired rolling stock contour that is to be produced by the rolling process during passage through the work rolls (1, 2);
(c) computation of a compensation cut for the work roll (1, 2) by subtraction of the rolling stock contour defined according to step (b) from the roll gap profile according to step (a) and multiplication of the computed difference by a damping factor (K);
(d) at least proportional application of the compensation cut computed according to step (c) to at least one work roll (1, 2).
2. A method in accordance with claim 1, characterized in that the compensation cut according to step (c) of claim 1 can be superimposed on another profiling of the work roll (1, 2).
3. A method in accordance with claim 2, characterized in that this other profiling of the work roll (1, 2) is a parabolic profiling or an S-shaped profiling (so-called CVC
profiling).
profiling).
4. A method in accordance with any of claims 1 to 3, characterized in that the damping factor (K) for the computation according to step (c) of claim 1 is 0.3-0.9 and preferably 0.4-0.8.
5. A method in accordance with any of claims 1 to 4, characterized in that the computation according to step (a) of claim 1 is based on the maximum width (B) provided for the rolling stock (3) that is to be rolled with the work rolls (1, 2).
6. A method in accordance with any of claims 1 to 5, characterized in that the computation according to step (a) of claim 1 is based on a well-defined rolling force.
7. A method in accordance with any of claims 1 to 6, characterized in that the computation according to step (a) of claim 1 is based on a well-defined work roll bending force (F B) .
8. A method in accordance with any of claims 1 to 7, characterized in that the definition according to step (b) of claim 1 is based on the same parameters as in step (a).
9. A method in accordance with any of claims 1 to 8, characterized in that the definition according to step (b) of claim 1 is based on a roll gap profile computed offline.
10. A method in accordance with claim 9, characterized in that the roll gap profile computed offline is based on an extended backup roll barrel, so that the edges of the rolling stock are not located in the region of the setback (6) of the second rolls (4, 5).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102009017536 | 2009-04-17 | ||
| DE102009017536.9 | 2009-04-17 | ||
| PCT/EP2010/002302 WO2010118862A2 (en) | 2009-04-17 | 2010-04-15 | Method for providing at least one work roll for rolling rolling stock |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2743400A1 CA2743400A1 (en) | 2010-10-21 |
| CA2743400C true CA2743400C (en) | 2013-02-26 |
Family
ID=42338053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2743400A Expired - Fee Related CA2743400C (en) | 2009-04-17 | 2010-04-15 | Method for providing at least one work roll for rolling rolling stock |
Country Status (15)
| Country | Link |
|---|---|
| US (1) | US20120000263A1 (en) |
| EP (1) | EP2419226B1 (en) |
| JP (1) | JP5679994B2 (en) |
| KR (1) | KR101299955B1 (en) |
| CN (1) | CN102395434B (en) |
| AU (1) | AU2010237331B2 (en) |
| BR (1) | BRPI1014649A2 (en) |
| CA (1) | CA2743400C (en) |
| DE (1) | DE102010014867A1 (en) |
| EG (1) | EG26541A (en) |
| MX (1) | MX2011005506A (en) |
| RU (1) | RU2487770C2 (en) |
| UA (1) | UA100086C2 (en) |
| WO (1) | WO2010118862A2 (en) |
| ZA (1) | ZA201102662B (en) |
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|---|---|---|---|---|
| JP6034188B2 (en) * | 2009-06-26 | 2016-11-30 | ライサンド アクツィエンゲゼルシャフト | Antimicrobial agent |
| DE102010063828A1 (en) * | 2010-12-22 | 2012-06-28 | Sms Siemag Ag | Back-up roll and roll arrangement |
| EP3124130A1 (en) * | 2015-07-28 | 2017-02-01 | Primetals Technologies Austria GmbH | Roller grinder for targeted prevention of quarter waves |
| DE102016222987A1 (en) * | 2016-11-22 | 2018-05-24 | Sms Group Gmbh | Method of grinding the contour of the bale of a roll |
| CN106553089B (en) * | 2016-11-24 | 2018-08-31 | 南京钢铁股份有限公司 | It is a kind of to use processing method of the plain external grinding machine processing with arc concavity roll |
| CN106734218A (en) * | 2016-12-30 | 2017-05-31 | 中铝西南铝冷连轧板带有限公司 | It is a kind of to solve the method that 4-roller cold rolling mill roller side pressure is leaned on |
| CN114700368B (en) * | 2022-03-07 | 2023-05-05 | 北京科技大学 | Work roll shape for eliminating local high points of plate and strip and design method |
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-
2010
- 2010-04-13 DE DE102010014867A patent/DE102010014867A1/en not_active Withdrawn
- 2010-04-15 EP EP10714199.6A patent/EP2419226B1/en active Active
- 2010-04-15 UA UAA201108796A patent/UA100086C2/en unknown
- 2010-04-15 AU AU2010237331A patent/AU2010237331B2/en not_active Ceased
- 2010-04-15 RU RU2011127006/02A patent/RU2487770C2/en active
- 2010-04-15 CN CN201080017853.6A patent/CN102395434B/en active Active
- 2010-04-15 JP JP2011546724A patent/JP5679994B2/en active Active
- 2010-04-15 BR BRPI1014649A patent/BRPI1014649A2/en not_active IP Right Cessation
- 2010-04-15 CA CA2743400A patent/CA2743400C/en not_active Expired - Fee Related
- 2010-04-15 WO PCT/EP2010/002302 patent/WO2010118862A2/en active Application Filing
- 2010-04-15 US US13/256,404 patent/US20120000263A1/en not_active Abandoned
- 2010-04-15 MX MX2011005506A patent/MX2011005506A/en not_active Application Discontinuation
- 2010-04-15 KR KR1020117010158A patent/KR101299955B1/en active IP Right Grant
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2011
- 2011-04-11 ZA ZA2011/02662A patent/ZA201102662B/en unknown
- 2011-05-26 EG EG2011050844A patent/EG26541A/en active
Also Published As
| Publication number | Publication date |
|---|---|
| EG26541A (en) | 2014-02-09 |
| WO2010118862A2 (en) | 2010-10-21 |
| WO2010118862A3 (en) | 2010-12-09 |
| DE102010014867A1 (en) | 2010-11-18 |
| CN102395434A (en) | 2012-03-28 |
| CN102395434B (en) | 2014-03-26 |
| EP2419226B1 (en) | 2014-02-26 |
| RU2487770C2 (en) | 2013-07-20 |
| RU2011127006A (en) | 2013-05-27 |
| MX2011005506A (en) | 2011-06-16 |
| JP2012516777A (en) | 2012-07-26 |
| WO2010118862A9 (en) | 2011-01-27 |
| BRPI1014649A2 (en) | 2016-04-12 |
| EP2419226A2 (en) | 2012-02-22 |
| AU2010237331A1 (en) | 2010-10-21 |
| JP5679994B2 (en) | 2015-03-04 |
| KR20110066216A (en) | 2011-06-16 |
| US20120000263A1 (en) | 2012-01-05 |
| KR101299955B1 (en) | 2013-08-26 |
| CA2743400A1 (en) | 2010-10-21 |
| UA100086C2 (en) | 2012-11-12 |
| ZA201102662B (en) | 2011-12-28 |
| AU2010237331B2 (en) | 2013-05-23 |
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