JP5905322B2 - Rolling mill with work roll shift function - Google Patents

Description

  The present invention is a rolling mill for rolling electromagnetic steel sheet material, high-tensile steel sheet material, ordinary steel sheet material, etc., and by shifting a work roll having one end tapered to the roll axis direction, the edge of the rolled material The present invention relates to a rolling mill having a work roll shift function for controlling a drop or controlling a plate shape.

  In general, when rolling with a flat work roll (one end of which is not tapered), the plate width end of the work roll has a Hertz flatness at the plate width end in the plate thickness distribution in the plate width direction of the material to be rolled. The plate thickness in the vicinity of the portion is extremely thin compared to the central portion of the plate. A so-called edge drop phenomenon occurs. If the edge drop amount is large, the edge trimming amount in the subsequent process increases, and the yield decreases accordingly. Therefore, a technique for reducing the edge drop amount has been strongly desired.

  Further, at the time of acceleration / deceleration of the rolling speed, the plate shape changes due to the correlation between the speed and the load, so that there is a problem that smooth acceleration and deceleration cannot be performed and the production efficiency is not improved. For this reason, a technique that can reduce changes in the plate shape during acceleration and deceleration has also been strongly desired.

  Therefore, conventionally, in a 6-high rolling mill and a 4-high rolling mill, as shown in Patent Document 1, the taper shoulder position of a work roll having a tapered taper at one end is shifted to the vicinity of the inside of the plate width end. If this can be done, the reduction in the plate thickness (edge drop) at the end of the plate width after rolling can be reduced by the amount of relief of the tapered portion, and the amount of edge trimming in the subsequent process is reduced, and the yield is improved accordingly.

  Further, the work roll from the intermediate roll or the reinforcing roll that is the support roll is obtained by matching the taper shoulder position of the tapered tapered portion disposed at the point-symmetrical position of the upper and lower work rolls with the vicinity of the outside of the plate width end. It can be seen that the harmful contact line pressure from the outside of the sheet width decreases, the shape stability (the shape change with respect to the load change is small) is greatly increased, stable rolling is possible, and the production efficiency is improved.

Japanese Examined Patent Publication No. 7-16694 JP 59-61511 A

  However, as shown in Patent Document 1, even if an attempt is made to match the taper shoulder position in the taper-shaped taper portion to the vicinity of the inner side of the plate width end or the vicinity of the outer side of the plate width end, the plate meanders during rolling. Assuming that the end position is unknown and the plate is in the center of the mill, the tapered shoulder position of the tapered portion has to be matched with the assumed end position of the plate width.

  As a result, the taper shoulder position of the taper-shaped tapered portion of the work roll cannot be accurately adjusted to the vicinity of the inner side of the plate width end or the outer side of the plate width end, and is set to be shifted by the amount of meandering of the plate. However, there has been a problem that the yield cannot be improved sufficiently by reducing the edge drop and the production efficiency cannot be sufficiently improved by realizing stable rolling.

  Further, in Patent Document 2, a position difference between the actual position of the material to be rolled and the appropriate position with respect to the rolling mill is obtained based on the detection results of the plate edge detector and the shift amount detector of the roll shift device, and the position There is disclosed a technique for correcting the position in the width direction of a rolled material by adjusting the size of each of the left and right gaps of the work roll according to the difference, that is, correcting the meandering of the plate.

  Although this can reduce the edge drop, there is a problem that the control operation becomes complicated and the cost increases due to the increase in the number of points of the control device and the like.

  Accordingly, an object of the present invention is to realize an improvement in yield and stable rolling by simple means, and a work roll shift that can be rolled into a symmetrical shape on the operation side and the drive side even when the metal strip is meandering. It is providing the rolling mill provided with the function.

A rolling mill having a work roll shift function according to the present invention for solving the above-mentioned problems is as follows.
A six-high rolling mill comprising a pair of upper and lower work rolls for rolling a metal strip, a pair of upper and lower intermediate rolls for supporting the work rolls, and a pair of upper and lower reinforcing rolls for supporting the intermediate rolls, or a pair of upper and lower work rolls And a four-high rolling mill comprising a pair of upper and lower reinforcing rolls supporting the work roll,
The pair of upper and lower work rolls are provided with a tapered portion at a vertical point symmetrical position,
A work roll drive device that shifts the pair of upper and lower work rolls in the roll axis direction, and a plate width end position detector that detects a plate width end on the operation side and the drive side of the metal strip,
Further, the taper start position in the taper portion of the pair of upper and lower work rolls is detected by the plate width end position detector separately on the upper and lower sides, near the inside of the plate width end on the operation side and the drive side, or outside the plate width end. In order to match the vicinity, provided with a control means for driving and controlling the work roll drive device,
It is characterized by that.

Also,
The pair of upper and lower intermediate rolls of the six-high rolling mill is also provided with a tapered portion at the vertical point symmetrical position, and an intermediate roll driving device for shifting the pair of upper and lower intermediate rolls in the roll axial direction,
The control means drives the intermediate roll so that the taper start position of the taper portion of the pair of upper and lower intermediate rolls is matched with the vicinity of the outside of the plate width end on the operation side and the drive side detected by the plate width end position detector. The apparatus is characterized in that drive control is performed separately on the upper and lower sides.

Also,
The pair of upper and lower intermediate rolls of the six-high rolling mill is also provided with a tapered portion at the vertical point symmetrical position, and an intermediate roll driving device that shifts the pair of upper and lower intermediate rolls in the roll axial direction. The intermediate roll driving device is driven and controlled so as to correct the above, and the pair of upper and lower intermediate rolls are asymmetrically shifted between the operation side and the driving side.

Also,
In a rolling mill comprising a pair of upper and lower work rolls for rolling a metal strip, a pair of upper and lower intermediate rolls for supporting the work roll, and a pair of upper and lower reinforcing rolls for supporting the intermediate roll,
The pair of upper and lower work rolls are provided with a tapered portion at a vertical point symmetrical position, and provided with a work roll drive device for shifting the pair of upper and lower work rolls in the roll axis direction,
The pair of upper and lower intermediate rolls is provided with a tapered portion at the vertical point symmetric position, and an intermediate roll driving device for shifting the pair of upper and lower intermediate rolls in the roll axial direction is provided.
A sheet width end position detector for detecting the sheet width end of the metal strip is provided on the entry side or exit side of the rolling mill, and the thickness of the sheet width end portion of the metal strip is measured on the exit side of the rolling mill. A board width end thickness meter is provided,
Wherein the tip thinned starting position that put on a pair of upper and lower intermediate rolls together with the drive control of the intermediate roll drive device to match the outer vicinity of the detected strip width end in the plate width end position detector, the pair of upper and lower work rolls in the above thinning starting position that put the plate width edge thickness of the plate width end portions which are measured by the thickness meter is operating side, so as to have a predetermined thickness at the drive side, the upper and lower separate the plate width end Control means for controlling the driving of the work roll drive device is provided so as to match the vicinity of the inside.

Also,
The work rolls of the four-high rolling mill are provided with independent roll bending devices on the operation side and the drive side, and the roll bending forces on the operation side and the drive side are changed in order to correct asymmetry of the plate shape. .

Also,
In the work roll and / or intermediate roll of the six-high rolling mill, independent roll bending devices are provided on the operation side and the drive side, and the roll bending force on the operation side and the drive side is changed to correct asymmetry of the plate shape. It is characterized by that.

  According to the configuration of the present invention, a sheet width end position detector is provided for meandering during rolling of the metal strip, the actual sheet width end position is detected, and the taper start position in the pair of upper and lower work rolls is The edge drop amount, which is a reduction in the plate thickness at the end of the plate width, can be more effectively reduced by independently adjusting the vicinity of the inside of the actual plate width end detected by the plate width end position detector. As a result, the amount of edge trimming in the subsequent process is reduced, and the yield is improved.

  In addition, by matching the taper start position of the pair of upper and lower work rolls with the vicinity of the outside of the actual board width end detected by the board width end position detector, harmful effects from outside the board width from the support roll to the work roll can be obtained. The contact line pressure is reduced, the shape stability (the shape change with respect to the load change is small) is greatly increased, and stable rolling becomes possible.

  In the 6-high rolling mill, the roll mark is transferred to the metal strip by matching the taper start position of the pair of upper and lower intermediate rolls with the vicinity of the outside of the sheet width end detected by the sheet width end position detector. Is prevented.

  Further, the meandering of the metal strips causes the plate shape to be asymmetric on the operation side and the drive side, but the taper start position on the pair of upper and lower intermediate rolls is adjusted to the vicinity of the outside of the plate width end and the taper on the pair of upper and lower work rolls The starting position is adjusted to be close to the inside of the plate width end separately so that the thickness of the plate width end portion measured by the plate width end thickness meter is a predetermined thickness on the operation side and the drive side. Thus, it becomes possible to roll into a symmetrical shape on the operation side and the drive side, and stable rolling can be realized.

It is a front view of the 6-high rolling mill which concerns on Example 1 of this invention. It is the II-II arrow sectional drawing of FIG. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2. It is explanatory drawing of the taper start position in the taper part of a work roll and an intermediate | middle roll. It is a graph of the comparison result of plate shape change with respect to load change, the figure (a) is a graph which shows the calculation result of the plate shape change with respect to the conventional load change, and the figure (b) is the plate shape with respect to the load change of the present invention. It is a graph which shows the calculation result of change. It is explanatory drawing of the board meandering which concerns on Example 2 of this invention. Similarly, in the case of plate meandering, there are explanatory views showing the necessity of the asymmetric shape control means, where FIG. (A) is an explanatory view of the material linear pressure distribution, and (b) is an explanatory view of the plate shape. It is explanatory drawing which similarly shows the example of application to a tandem rolling mill. It is a front view of the 6-high rolling mill which concerns on Example 3 of this invention. It is explanatory drawing which similarly shows the example of application to a tandem rolling mill. It is a front view of the 4-high rolling mill which concerns on Example 4 of this invention. It is XII-XII arrow sectional drawing of FIG.

  Hereinafter, a rolling mill equipped with a work roll shift function according to the present invention will be described in detail with reference to the drawings.

  1 is a front view of a six-high rolling mill according to Example 1 of the present invention, FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1, FIG. 3 is a cross-sectional view taken along the line III-III in FIG. FIG. 5 is an explanatory diagram of a taper start position at a taper portion of a work roll and an intermediate roll, and is a graph of a comparison result of a plate shape change with respect to a load change in FIG. 5, and FIG. (B) is a graph which shows the calculation result of the plate shape change with respect to the load change of this invention.

  As shown in FIGS. 1 to 4, the rolling mill according to the present embodiment is a six-high rolling mill, and a metal strip (hereinafter simply referred to as a strip) 1 as a material to be rolled is attached to a pair of upper and lower work rolls 2. Rolled. The pair of upper and lower work rolls 2 are respectively contacted and supported by a pair of upper and lower intermediate rolls 3, and the pair of upper and lower intermediate rolls 3 are each supported by a pair of upper and lower reinforcing rolls 4.

  The upper reinforcing roll 4 is supported by bearing housings 10a and 10c via bearings (not shown). The bearing housings 10a and 10c are pass line adjusting devices 5a and 5b such as a worm jack or a tapered wedge and a stepped rocker plate. Are supported by the housings 7a and 7b. Here, a load cell may be built in the pass line adjusting devices 5a and 5b to measure the rolling load. The lower reinforcing roll 4 is supported by bearing housings 10b and 10d through bearings (not shown), and the bearing housings 10b and 10d are supported by housings 7a and 7b through hydraulic cylinders 6a and 6b. .

  The pair of upper and lower work rolls 2 each have a tapered portion (reduced diameter portion) 2b at a vertical point symmetrical position with respect to the plate width center of the band plate 1, and 2a in the drawing indicates the tapered start position. Further, bearing boxes 8a to 8d are attached to the roll neck portions of the pair of upper and lower work rolls 2 via bearings (not shown).

  The pair of upper and lower work rolls 2 are moved (shifted) in the roll axis direction by a pair of left and right shift cylinders (work roll drive devices) 13 via drive-side bearing boxes 8c and 8d, a detachable hook 12, and a shift frame 11. ) Is possible. Further, these bearing boxes 8a to 8d are provided with bending cylinders (roll bending devices) 31a to 31d for applying roll bending. This gives roll bending to the work roll 2.

  Here, the rolling load is applied by the hydraulic cylinders 6a and 6b described above, and the rolling torque is transmitted directly from the spindle (not shown) to the pair of upper and lower work rolls 2 or indirectly from the spindle via the intermediate roll 3. Is transmitted to the work roll 2.

  Each of the pair of upper and lower intermediate rolls 3 has a tapered portion (reduced diameter portion) 3b at a vertical point symmetrical position with respect to the center of the width of the band plate 1, and 3a in the drawing indicates the tapered start position. Bearing boxes 9a to 9d are attached to the roll neck portions of the pair of upper and lower intermediate rolls 3 via bearings (not shown).

  The pair of upper and lower intermediate rolls 3 are connected to a pair of left and right shift cylinders (intermediate roll drive device) 34 via drive side bearing boxes 8c and 8d, a detachable hook (not shown), and a shift frame (not shown). Thus, it can be moved (shifted) in the roll axis direction. Further, these bearing boxes 9a to 9d are provided with bending cylinders (roll bending devices) 30a to 30d for applying roll bending. This gives roll bending to the intermediate roll 3.

  A sheet width end position detector 32 is provided on the entry side or exit side (entrance side in the illustrated example) of the rolling mill so as to detect the actual sheet width end position of the strip 1. The detection signal of the plate width end position detector 32 is input to a controller (control means) 35. The controller 35 drives and controls the pair of left and right shift cylinders 13 and 34 based on the detection signal, and adjusts the shift direction and the shift amount of the work roll 2 and the intermediate roll 3.

  Since it is configured in this manner, the sheet width end position detector 32 detects the actual sheet width end position with respect to the meandering of the strip 1 during rolling, and the upper and lower point symmetrical positions of the pair of upper and lower work rolls 2 are detected. The taper start position 2a arranged at the position is shifted so as to be matched with the vicinity of the inside of the actual plate width end detected by the plate width end position detector 32 independently of the upper and lower sides.

  As a result, the plate width end portion 1a becomes relatively thicker than the plate center by the clearance of the taper start position 2a (see δw and δd in FIG. 4), and as a result, the plate thickness of the plate width end portion 1a after rolling is reduced. (Edge drop) is also suppressed, the amount of edge trimming in the subsequent process is reduced, and the yield is improved accordingly.

  Further, in this embodiment, an example in which roll bending is applied to the pair of upper and lower intermediate rolls 3 is shown, but in this embodiment, the plate shape control ability is excellent in combination with the shift function of the pair of upper and lower intermediate rolls 3 described above. . The intermediate roll 3 may not be given roll bending. In this case, the plate shape control ability is lowered, but the structure is simple.

  Here, the taper start position 2a arranged at the vertical point symmetrical position of the pair of upper and lower work rolls 2 is shifted so as to be close to the inside of the actual plate width end, and is arranged at the vertical point symmetrical position of the pair of upper and lower intermediate rolls 3. The roll mark is transferred to the band plate 1 by always matching the taper start position 3a to the vicinity of the actual plate width end detected by the plate width end position detector 32 (see δiw and δid in FIG. 4) ( It is possible to prevent the taper start position 3a from shifting to the inside of the actual plate width end) or an end extension shape (by shifting the taper start position 3a to the outside of the actual plate width end).

  Further, when shifting so that the taper start position 2a in the work roll 2 is aligned with the outside vicinity of the sheet width end, and further when shifting is performed so that the taper start position 3a of the intermediate roll 3 is aligned near the outside of the sheet width end, Shape stability (small shape change with respect to load change) is improved.

  This shape stability will be described with reference to FIG. The figure (a) is the case where the flat work roll 200 without the taper taper shoulder of the prior art is shifted so that the taper start position of the intermediate roll 300 is adjusted to the vicinity of the outside of the plate width end, and the load is from 1041 tons. When 1.2 times change to 1245 tons, the shape changes by 23 I-unit (position in the steel plate width direction and elongation difference when rolling the steel plate). On the other hand, FIG. 4B shows a shift so that the taper start position of the work roll 2 is aligned with the vicinity of the outside of the sheet width end, and further, the taper start position of the intermediate roll 3 is shifted to match the vicinity of the outside of the sheet width end. In the case where the load is changed 1.2 times from 1041 tons to 1245 tons, the shape is changed to 15 I-unit, and the amount of change is reduced to 65% (= 15/23). This means that the shape change is small with respect to the load change during acceleration and deceleration of the rolling speed, and accordingly, the present invention shows that the shape stability is greatly improved.

  FIG. 6 is an explanatory view of a plate meander according to Embodiment 2 of the present invention, FIG. 7 is an explanatory view showing the necessity of an asymmetric shape control means in the case of the plate meander, and FIG. FIG. 8B is an explanatory view of a plate shape, and FIG. 8 is an explanatory view showing an application example to the tandem rolling mill.

  The band plate 1 meanders so that the taper start position 2a arranged at the vertical point symmetrical position of the pair of upper and lower work rolls 2 is matched with the vicinity of the outer side of the plate width end or the inner side of the plate width end. When shifted, the plate shape becomes asymmetric on the operation side and the drive side. The asymmetry of the plate shape when the band plate 1 meanders will be described with reference to FIGS.

  First, when the plate center O1 meanders to the drive side by e with respect to the mill center O2, the taper start position 2a is shifted by this meandering amount. Thereby, the said taper start position 2a can be set to the inner side vicinity of the board width end of an actual board width end, or the outer side vicinity of a board width end. However, since the plate center O1 is offset by e toward the drive side with respect to the mill center O2, the linear pressure distribution of the material of the work roll 2 and the strip 1 is indicated by a vertical straight arrow in FIG. As shown, the drive side is low and the operation side is high. As a result, as shown in FIG. 7B, the shape of the band plate 1 is a plate shape in which end elongation Т is generated on the operation side.

  Accordingly, as the operation side and drive side asymmetric shape control means, the shift cylinder 34 is driven and controlled by the controller 35 described in the first embodiment, and the vertical asymmetric shift of the pair of upper and lower intermediate rolls 3 is performed. That is, in this case, the taper start position 3a of the upper intermediate roll 3 is shifted to the drive side, and the taper start position 3a of the lower intermediate roll 3 is also shifted to the drive side (see the horizontal straight arrow in FIG. 7A). .

  Thereby, it becomes possible to roll into a symmetrical shape on the operation side and the drive side, and stable rolling can be realized. At this time, the roll bender force on the operation side of the roll bender device in the work roll 2 and / or the intermediate roll 3 is made larger than that on the drive side, as indicated by an arc-shaped arrow in FIG. Also good.

  Further, as shown in FIG. 1 stand to NO. The rolling mill of this embodiment is installed in at least one stand (NO.5 stand in the illustrated example) of a tandem rolling mill having five stands, and the entrance side (exit side) of this one stand (NO.5 stand in the illustrated example) It is preferable that the plate width end position detector 32 is installed. According to this, even in a tandem rolling mill, the amount of edge drop can be reduced by the inexpensive sheet width end position detector 32.

  FIG. 9 is a front view of a six-high rolling mill according to Embodiment 3 of the present invention, and FIG. 10 is an explanatory view showing an application example to the tandem rolling mill.

  The present embodiment detects the actual plate width end position with the plate width end position detector 32 installed on the rolling mill entry side (or the exit side) with respect to meandering during rolling of the strip 1, The taper start position 3a arranged at the vertical point symmetrical position of the pair of upper and lower intermediate rolls 3 is shifted so as to be aligned with the outside vicinity of the actual sheet width end detected by the sheet width end position detector 32 independently of the upper and lower sides, and rolling. A plate width end thickness meter 33 is installed on the machine exit side, and a pair of upper and lower sides are set so that the thickness of the measured plate width end portion becomes a predetermined thickness (reduction in edge drop amount) on the operation side and the drive side. The taper start position 2a arranged at the vertically symmetrical position of the work roll 2 is shifted up and down separately in the vicinity of the inside of the plate width end.

  Here, the edge drop reduction method by the shift of the work roll 2 having the taper start position 2a will be described below. First, the work roll 2 is provided with a taper start position 2a at a vertical point symmetrical position, and distances between the taper start position 2a and the plate width end are set as δw and δd (see FIG. 4). Moreover, the plate width end thickness meter 33 measures the plate thickness at one point or a plurality of points in the vicinity of the operation side and drive side plate width ends on the rolling mill exit side.

  If the plate thickness at one point or a plurality of points in the vicinity of the plate width end measured on the operation side is smaller than the predetermined plate thickness, the upper work roll 2 is shifted in the roll axis narrow direction. That is, the upper work roll 2 is shifted in the direction of increasing δw. Conversely, if the measured plate thickness near the end of the plate width is thicker than the predetermined plate thickness, the upper work roll 2 is shifted in the roll axis wide direction. That is, the upper work roll 2 is shifted in the direction of decreasing δw. Further, when the plate thickness at one point or a plurality of points in the vicinity of the plate width end portion measured on the driving side is different from the predetermined plate thickness, the lower work roll 2 is similarly shifted so as to become the predetermined plate thickness.

  According to this, although the expensive board width end thickness meter 33 using X-rays is used, the amount of edge drop can be reduced with high accuracy in combination with an inexpensive board width end position detector 32. it can. Also in this embodiment, as the operation side and drive side asymmetric shape control means, the shift cylinder 34 is driven and controlled by the controller 35 described in the first embodiment, and the vertical asymmetric shift of the pair of upper and lower intermediate rolls 3 is performed. The shape stability may be improved.

  Further, as shown in FIG. 1 stand to NO. The rolling mill of this embodiment is installed in at least one stand (NO.5 stand in the illustrated example) of a tandem rolling mill having five stands, and the entrance side (exit side) of this one stand (NO.5 stand in the illustrated example) However, it is preferable to install a plate width end position detector 32 on the outlet side (or an inlet side) and to install a plate width end thickness meter 33 on the outlet side (or on the inlet side). According to this, even in a tandem rolling mill, the amount of edge drop can be reduced.

  FIG. 11 is a front view of a four-high rolling mill according to Embodiment 4 of the present invention, and FIG. 12 is a cross-sectional view taken along arrow XII-XII in FIG.

  The rolling mill of the present embodiment is a four-high rolling mill, and has a configuration in which the pair of upper and lower intermediate rolls 3 and a set of bearing boxes 9a to 9d are removed from the six-high rolling mill of the first to third embodiments. Moreover, the plate width end position detector 32 is installed on the exit side of the rolling mill. In this case, since the shift function of the intermediate roll 3 cannot be obtained, the plate shape control capability is greatly reduced, but there is an advantage that the structure is simpler than those of the first to third embodiments.

  The present invention shifts a work roll having a tapered taper shoulder to the inside of the actual plate width end detected by the plate width end position detector or the vicinity of the outside of the actual plate width end, and is excellent in edge drop reduction and shape stability. Applicable to rolling mills.

DESCRIPTION OF SYMBOLS 1 Metal strip 1a Plate width edge part 2 Work roll 2a Tapering start position 2b Tapered part 3 Intermediate roll 3a Tapering start position 3b Tapered part 4 Reinforcement roll 5 (5a, 5b) Passline adjustment device 6 (6a, 6b) Hydraulic cylinder 7 (7a, 7b) Housing 8a to 8d Work roll bearing box 9a to 9d Intermediate roll bearing box 10a to 10d Reinforcement roll bearing box 11 Shift frame 12 Removable hook 13 Shift cylinder (work roll drive device)
30a-30d Bending cylinder 31a-31d Bending cylinder 32 Plate width end position detector 33 Plate width end thickness meter 34 Shift cylinder (intermediate roll drive device)
35 Controller (control means)
e Plate center offset O1 Plate center O2 Mill center Т End elongation

Claims (6)

A six-high rolling mill comprising a pair of upper and lower work rolls for rolling a metal strip, a pair of upper and lower intermediate rolls for supporting the work rolls, and a pair of upper and lower reinforcing rolls for supporting the intermediate rolls, or a pair of upper and lower work rolls And a four-high rolling mill comprising a pair of upper and lower reinforcing rolls supporting the work roll,
The pair of upper and lower work rolls are provided with a tapered portion at a vertical point symmetrical position,
A work roll drive device that shifts the pair of upper and lower work rolls in the roll axis direction, and a plate width end position detector that detects a plate width end on the operation side and the drive side of the metal strip,
Further, the taper start position in the taper portion of the pair of upper and lower work rolls is detected by the plate width end position detector separately on the upper and lower sides, near the inside of the plate width end on the operation side and the drive side, or outside the plate width end. In order to match the vicinity, provided with a control means for driving and controlling the work roll drive device,
A rolling mill having a work roll shift function. The pair of upper and lower intermediate rolls of the six-high rolling mill is also provided with a tapered portion at the vertical point symmetrical position, and an intermediate roll driving device for shifting the pair of upper and lower intermediate rolls in the roll axial direction,
The control means drives the intermediate roll so that the taper start position of the taper portion of the pair of upper and lower intermediate rolls is matched with the vicinity of the outside of the plate width end on the operation side and the drive side detected by the plate width end position detector. 2. The rolling mill having a work roll shift function according to claim 1, wherein the apparatus is driven and controlled separately up and down.   The pair of upper and lower intermediate rolls of the six-high rolling mill is also provided with a tapered portion at the vertical point symmetrical position, and an intermediate roll driving device that shifts the pair of upper and lower intermediate rolls in the roll axial direction. 2. The work roll shift function according to claim 1, wherein the intermediate roll driving device is driven and controlled so as to correct the shift, and the pair of upper and lower intermediate rolls are asymmetrically shifted between the operation side and the drive side. Rolled mill. In a rolling mill comprising a pair of upper and lower work rolls for rolling a metal strip, a pair of upper and lower intermediate rolls for supporting the work roll, and a pair of upper and lower reinforcing rolls for supporting the intermediate roll,
The pair of upper and lower work rolls are provided with a tapered portion at a vertical point symmetrical position, and provided with a work roll drive device for shifting the pair of upper and lower work rolls in the roll axis direction,
The pair of upper and lower intermediate rolls is provided with a tapered portion at the vertical point symmetric position, and an intermediate roll driving device for shifting the pair of upper and lower intermediate rolls in the roll axial direction is provided.
A sheet width end position detector for detecting the sheet width end of the metal strip is provided on the entry side or exit side of the rolling mill, and the thickness of the sheet width end portion of the metal strip is measured on the exit side of the rolling mill. A board width end thickness meter is provided,
Wherein the tip thinned starting position that put on a pair of upper and lower intermediate rolls together with the drive control of the intermediate roll drive device to match the outer vicinity of the detected strip width end in the plate width end position detector, the pair of upper and lower work rolls in the above thinning starting position that put the plate width edge thickness of the plate width end portions which are measured by the thickness meter is operating side, so as to have a predetermined thickness at the drive side, the upper and lower separate the plate width end A rolling mill having a work roll shift function, characterized in that a control means for driving and controlling the work roll drive device is provided so as to match the vicinity of the inside.   The work rolls of the four-high rolling mill are provided with independent roll bending devices on the operation side and the drive side, and the roll bending forces on the operation side and the drive side are changed in order to correct asymmetry of the plate shape. A rolling mill having the work roll shift function according to claim 1.   In the work roll and / or intermediate roll of the six-high rolling mill, independent roll bending devices are provided on the operation side and the drive side, and the roll bending force on the operation side and the drive side is changed to correct asymmetry of the plate shape. A rolling mill having a work roll shift function according to claim 1.

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