JP4159456B2 - Sheet rolling machine with excellent shape controllability and sheet feeding - Google Patents

Description

  The present invention relates to a rolling mill for rolling a strip-shaped thin steel plate or a thick steel plate such as a hot rolled steel plate or a cold rolled steel plate, and more particularly to a plate rolling machine excellent in shape controllability and sheet passing property.

  Strip steel plates such as hot-rolled steel plates and cold-rolled steel plates are subjected to rough rolling of a heated steel slab with a roughing mill, and then a finishing mill having a multi-stage roll of 4-Hi or 6-Hi in the rolling direction. It is manufactured by rolling with a tandem finish rolling mill array in which a plurality of units are arranged, and the multi-stage finish rolling mill has a 4-Hi having a pair of upper and lower work rolls and upper and lower backup rolls for reinforcing the work rolls, or a work roll. A 6-Hi rolling mill in which an intermediate roll is further arranged between the backup roll is used.

  Table rollers are arranged on the front and rear surfaces of the rolling mill, and the rolled material transported on the front table rollers is bitten by work rolls, and is reduced to a predetermined plate thickness by the rear table rollers. It is carried out.

  At this time, the upper and lower table roller upper surfaces and the upper surface of the work roll under the rolling mill are usually adjusted so that the pass lines are at the same level, and the upper and lower surfaces of the rolled material are substantially the same within a certain thickness range. It is bitten by the work roll at the timing, and can receive a uniform reduction to obtain a problem-free shape.

  However, it is inevitable that the thickness of the rolled material used in the rolling mill is wide. For example, when the thickness of the rolled material fluctuates greatly, the biting position differs on the upper and lower surfaces of the rolled material and is uniform in the vertical direction. Therefore, there is a problem in that shape deformation such as upward warping, downward warping, and waves occurs. In addition, the impact on the rolling mill and the rolling load power greatly vary due to the vertical deviation of the biting position as described above.

  The occurrence of such shape defects and fluctuations in impact and rolling load not only impair product quality, but also hinder smooth operation in high-speed rolling.

  For this reason, improvement is required from the viewpoint of securing the quality of the rolled product and stable rolling operation and improving productivity.

  As a method for controlling the shape of a product in a rolling operation, Patent Document 1 discloses that in a plate rolling machine that supports a work roll by a backup roll divided into three or more parts, tension is applied to the steel sheet on the entry side and the exit side of the rolling mill. There has been proposed a plate rolling machine provided with a tension applying device. This is a tension applying device, for example, a pinch roll, an electromagnetic brake, a tension pad, etc., and a rolling roll (work roll), and controls the shape by applying tension to the rolled material. It has been proposed that it is preferably provided in the vicinity of the rolling roll.

  Further, in Patent Document 2, a lifting table that has a roller that can be moved up and down is disposed between the rollers of the entry table and the delivery table of the shape rolling mill, and this lifting table corresponds to the flange width of the rolling material. Thus, it has been proposed that an accurate shape steel is produced by providing a pass line adjusting device that appropriately moves up and down.

  By the way, the end of the rolled material becomes unstable because no tension is applied until the end of the rolled material exits the pinch roll and is bitten by the work roll. In order to suppress this, it is necessary to make the distance between the pinch roll and the work roll as small as possible. However, in order to give sufficient tension between the pinch roll and the work roll as in the method of Patent Document 1, the pinch roll must have sufficient rigidity, and therefore the pinch roll has a large diameter. It must be a roll. It is difficult to provide a large-diameter pinch roll close to the housing of the rolling mill. Therefore, there is a limit to the application of tension by the pinch roll. Moreover, the pinch roll illustrated as a tension | tensile_strength imparting apparatus is only shown that an upper roll raises / lowers, it is not described about raising / lowering a lower roll, but it is suggested adjusting a pass line. Not.

  Moreover, in the method of patent document 2, although the height of a roll surface can be changed by raising / lowering of a raising / lowering table, since it is not the structure which clamps material from upper direction, the biting angle of a rolling material cannot be adjusted, rolling There is a limit to the shape control of the material.

JP 2000-167604 A JP-A-8-39124

  In view of the above problems, the present invention controls a wide range of an approach angle (engagement angle) on a work roll entry side and a discharge angle (extrusion angle) on the exit side of a rolled material in a rolling mill. It is an object of the present invention to provide a plate rolling machine that can improve the shape of the steel sheet and improve the sheet passing property.

  The present invention has been made to solve the above-described problems, and the gist thereof is as follows.

(1) A rolling mill that is provided with work rolls on the upper and lower sides and rolls a steel sheet, and has a large-diameter pinch composed of a pair of upper and lower rolls capable of applying a required tension for shape control on the entry side and the exit side of the rolling mill. A guide comprising a pair of upper and lower rolls having a smaller diameter than the pinch roll, wherein the roll is disposed close to the work roll, and further, the unconstrained distance can be shortened between the large diameter pinch roll and the work roll. characterized by being arranged to roll, the shape controllability and excellent plate rolling mill in sheet passing property.

(2) In at least one of the guide roll and the pinch roll , a lower roll is provided so as to be movable up and down so that the height of the pass line of the rolled material can be adjusted up and down from a reference line formed by the upper surface of the roller table and the work roll. (1) The plate rolling machine excellent in shape controllability and plate-passability.

  According to the present invention, since both the guide roll and the pinch roll composed of a pair of upper and lower rolls are provided on the entry side and the exit side of the rolling mill, it is possible to apply tension to the steel sheet, thereby providing shape controllability. Can be improved. Moreover, since the diameter of a guide roll can be made small by providing both a guide roll and a pinch roll, a guide roll can be installed close to a rolling mill. Therefore, the distance at which the end of the rolled material is in an unconstrained (free) state can be shortened, so that the shape stability during rolling is improved and the shape quality of the obtained steel sheet is improved.

  Moreover, since the lower roll of the guide roll and pinch roll consisting of a pair of upper and lower rolls can be raised and lowered, the steel sheet can be raised and lowered in a clamped state in the vertical direction, and the pass line can be freely adjusted. During rolling, the approach angle and the payout angle of the steel sheet with respect to the work roll can be freely adjusted. Therefore, the shape of the steel plate can be improved and the plate passing property can be improved.

  Hereinafter, the present invention will be specifically described with reference to the drawings of the embodiments.

  FIG. 1 is a diagram for explaining a basic arrangement of main rolls of a rolling mill according to the present invention. Upper and lower guide rolls 2u, 2l, 2u ', 2l' close to the entry and exit sides of the upper and lower work rolls 1u, 1l of the rolling mill, and upper and lower pinch rolls 3u, 3l, close to this guide roll, 3u ′ and 3l ′ are arranged. And the diameter of a guide roll is smaller than the diameter of a pinch roll, for example, is formed in 1 / 2-1 / 3. That is, by providing both the guide roll and the pinch roll in this way, the diameter of the guide roll can be reduced, and the guide roll can be installed very close to the rolling mill. Therefore, the distance at which the rolling end is in an unconstrained (free) state can be shortened, so that the stability of the sheet passing during rolling is improved and the shape quality of the obtained steel sheet is improved. The upper guide roll and / or the pinch roll are provided so as to be able to move up and down so that the rolled material can be brought into close contact with the lower guide roll and / or the pinch roll.

  Next, FIG. 2 is a figure explaining the example of the basic arrangement | sequence of the main roll in the other Example of the rolling mill of this invention. In this example, similar to FIG. 1, the upper and lower guide rolls 2u, 2l, 2u ', 2l' and the guide rolls are arranged close to the entry and exit sides of the upper and lower work rolls 1u, 1l of the rolling mill. The upper and lower pinch rolls 3u, 3l, 3u ′, and 3l ′ are disposed adjacent to each other.

  Furthermore, lower guide rolls 21 and 21 and / or pinch rolls 31 and 31 are provided so as to be movable up and down. That is, as described above, since the upper guide roll 2u and the pinch roll 3u can be raised and lowered, in the example of FIG. 2, the upper and lower rolls can also be raised and lowered. Accordingly, the heights of the lower guide rolls 2l, 2l 'and the lower pinch rolls 3l, 3l' on the entry side and the exit side can be adjusted based on the height of the lower work roll 1l. As a result, the height of the pass line 5 of the rolled material can be adjusted.

  That is, the upper guide rolls 2u and 2u ′ and the upper pinch rolls 3u and 3u ′ cooperate with the lower guide rolls 2l and 2l ′ and the lower pinch rolls 3l and 3l ′, respectively, to sandwich the rolled material, and the lower guide rolls 2l. By changing the height of 2l 'and / or the lower pinch rolls 3l, 3l', the pass line can be changed and rolled.

  FIG. 3 schematically shows an example of adjusting the pass line by changing the height of the lower guide roll 2l and / or the pinch roll 3l. Although FIG. 3 shows the roll on the entry side of the rolling mill, the same applies to the roll on the exit side of the rolling mill, and the description on the exit side is omitted. In addition, a roller table 36 in which a large number of table rollers are arranged is usually arranged on the upstream side of the entry side pinch roll and the downstream side of the exit side pinch roll.

  3A shows the height positions of the lower guide roll 2l and the lower pinch roll 3l with reference lines (the height when the upper surfaces of the roller table, the pinch roll, the guide roll, and the work roll are arranged at substantially the same height. This is an example in which the lower guide roll 2l, the lower pinch roll 3l, and the work roll 1l are connected so that the line, that is, the pass line is linear. This makes it possible to reliably control the approach angle / discharge angle of the rolled sheet S with respect to the work roll 1, and is suitable, for example, when rolling a relatively thick rolled material. Moreover, FIG.3 (b) and FIG.3 (c) are the examples of the intermesh arrangement | positioning adjusted so that a pass line may become partially concave shape, and these are all suitable when rolling a thin steel plate. It is.

  FIG. 3B shows an arrangement in which the lower pinch roll 3l is lowered from the reference line 5, and it is possible to adjust the shape while ensuring that the angle of entry / discharge of the rolled sheet with respect to the work roll is 90 °. . FIG. 3C shows an arrangement in which the lower guide roll is lowered from the reference line 5, and the pass line height between the next tables is adjusted while adjusting the shape while controlling the approach angle / discharge angle of the rolled sheet. Can be improved.

Entry side of the thus the lower work roll height and / or rolling machines, based on the height of the is provided on the exit side table roller, rolling mill entry side, the delivery side of the lower guide roll, the lower the pinch By adjusting the height of the roll and freely controlling the pass line, it is possible to control the shape of the plate, such as warping, and the posture of the plate, and to improve the shape of the plate and the plate passing property.

  Next, the rolling mill of this invention is demonstrated based on drawing of an Example.

  FIG. 4 is a diagram showing the configuration of an embodiment of the rolling mill of the present invention, and is a perspective view showing a state cut at a plane perpendicular to the width direction at the center in the width direction of the rolling mill.

  FIG. 5 is a perspective view showing the installation state of the guide rolls in FIG.

In the following description, as shown in FIG. 4, the rolled material S in rolling moves from the left to the right of the rolling mill, and this moving direction is the rolling direction. Accordingly, the left side of the rolling mill is the entry side and the right side is the exit side. Also, the horizontal direction in the plane perpendicular to the rolling direction is the roll axis direction or the rolling mill width direction, and one is the drive side (DS) and the other is the work side (WS).

  FIG. 4 is a perspective view showing a state in which the rolling mill is cut along a vertical plane parallel to the rolling direction at the center in the width direction of the rolling mill and the driving side is viewed from the working side. The structure on the working side is usually a surface object with respect to the vertical surface. In FIG. 4, the configuration on the drive side (DS) will be mainly described, but unless otherwise specified, each part is also configured to be plane-symmetrical on the work side, and the description is omitted.

Mill 6 includes a housing configured between the post and the four housing posts 8 from the mill frame 7 for integrally connecting, movably mounted at an upper portion in the housing vertically through the main pressure device 9 The upper inner housing 10 has a housing base 11 provided at the lower portion of the housing, the upper divided backup roll 4u supported by the upper inner housing 10 via the upper mount 12, and the lower housing base 11 Basically composed of a lower divided backup roll 4l supported through the lower mount 13, an upper work roll 1u incorporated in the upper divided backup roll 4u, and a lower work roll 1l incorporated in the lower divided backup roll 4l. Has been. The upper and lower work rolls 1u, 1l are connected to a drive device (not shown) via a spindle (not shown) on the drive side (DS) of the rolling mill.

  Further, the upper and lower guide rolls 2u, 2l, 2'u, 2'l, and pinch rolls 3u, 3l, 3'u, 3'l on the entry side and the exit side of the rolling mill in order from the side closer to the work roll. Is provided.

In the present invention, the guide rolls 2u, 2l, 2u ', 2l ', the pinch rolls 3u, 3l, 3u ', 3l ' is rolling mill so as to be nearly symmetrical with respect to a plane perpendicular to the rolling direction Since it is provided on the entry side and the exit side, in the following description, the entry side will be mainly described, but the explanation is omitted because the exit side is also configured in the same manner.

  First, the upper and lower guide rolls 2u and 2l will be described. As shown in FIG. 5, the upper guide roll 2 u is supported by the upper guide roll lifting cylinders 14, 14 provided on the housing posts 8, 8 on both sides in the width direction of the housing so as to be movable up and down, and the housing posts 8, 8. An upper guide roll support frame 15 extending in the width direction is supported via an upper guide roll support frame 16. On the other hand, the lower guide roll 21 is supported by the lower guide roll support frame 17 extending in the width direction between the housing posts 8 and 8 via the upper guide roll support frame 18.

  The lower guide roll support frame 17 can be lifted and lowered via lift devices provided on support members 19 and 19 fixed at least at two locations (drive side and work side) in the width direction of the housing base 11. It is supported by. In the example of FIG. 5, the lifting device is constituted by worm jacks 20 and 20, and the worm jacks 20 and 20 are connected by a worm connecting shaft 21. The worm connecting shaft 21 is connected to a lower guide roll raising / lowering motor (worm driving motor) 22. By rotating the lower guide roll raising / lowering motor 22, the worm jack moves up and down, and the height of the lower guide roll can be adjusted in synchronization with the driving side and the working side in the roll axis direction (width direction).

  Note that the lifting device is not limited to a worm jack, and other methods such as a wedge mechanism can be adopted.

  The support member 19 is provided with a guide roll height detector 23 for detecting the height of the lower guide roll 2l.

  Next, the pinch roll will be described.

  As shown in FIG. 4, a sub post 24 is provided on the upstream side in the rolling direction of the housing post 8 (downstream side in the rolling direction in the case of the outlet side), and extends from the middle of the height of the housing post to the position of the sub post 24. A subframe 25 is provided. The upper pinch roll 3u is supported by an upper pinch roll chock 27 provided so as to be movable up and down between the housing post 8 and the sub post 24 by an upper pinch roll raising / lowering cylinder 26 provided at an upper portion of the sub frame 25. Yes.

  On the other hand, similarly to the upper pinch roll 3u, the lower pinch roll 3l is supported between the sub post 24 and the housing post 8 by a lower pinch roll chock 28 so as to be movable up and down. The lower pinch roll chock 28 is supported by a housing base 29 via a wedge mechanism. That is, as shown in FIG. 6, the lower pinch roll chock 28 is provided with a slide member 31 having a slide member 32 on a slide surface facing the wedge member 30, while the slide member 31 and the housing are provided. A wedge member 30 is provided between the upper surface of the base 29. A sliding member 33 is provided on the sliding surface of the wedge member 30 facing the housing base 29. As shown in FIG. 7, the wedge members 30, 30 on both axial sides (drive side, work side) of the pinch roll are connected by a wedge drive connecting shaft 34, and one end of the drive connecting shaft 34 is used for driving the wedge. A motor 35 is provided.

  By rotating the wedge drive motor 35, the wedge members 30 and 30 move in the roll axis direction, and the lower pinch roll chock 28 moves up and down by the wedge action. As a result, the drive side and the work side in the roll axis direction can be synchronized to adjust the height.

In addition, the switch Yokku lower pinch rolls, pinch roll for detecting the height of the lower pinch roll 3l height detector (not shown) is provided.

  As described above, the housing post, the sub post, the lower pinch roll chock, the housing base, and the like are provided symmetrically on the working side in the same configuration as the driving side, and it goes without saying that the wedge is also provided in the same manner. Yes.

As described above, the pinch rolls, the bottom roll of the guide rolls, c Omu mechanism, can be employed a device having a lifting and lowering function wedge mechanism, adjust a height position with high accuracy, when set, 6, It is preferable to use a height adjusting mechanism such as a wedge mechanism such as 7.

  Needless to say, when adjusting and setting the height direction, it is important to adjust the roll axial direction (width direction) in synchronism with the height adjusting mechanism as described above.

  Further, the lower rolls 2l and 3l of the pinch roll and the guide roll detect the height of the upper surface of each roll, that is, the pass line height, calculate the required height of the lower roll, and display it if necessary. It is preferable to provide a calculation display device.

  Further, the elevating cylinders 14 and 26 of the upper pinch roll 2u and the upper guide roll 3u secure a required reduction position corresponding to the fluctuation heights of the corresponding lower rolls 2l and 3l, respectively. Needless to say, it is provided with a lifting cylinder stroke that can reduce the rolling force, and with a rolling force that can apply a predetermined rolling force to the rolled material at a predetermined position.

  In addition, when changing the height of the lower pinch roll, if the difference between the roll height of the existing roller table 36 adjacent to the pinch roll and the roll height of the lower pinch roll 3l becomes too large, the plate passing property is hindered, It is preferable to adjust the height of the lower pinch roll so as to be within a desired range in consideration of wrinkles in the steel sheet and the need to increase the pinch force of the pinch roll.

More preferably, also the height can be changed roller table rolls adjacent to the pinch rolls.

  Here, in the embodiment described in FIG. 4 and FIG. 5, the example of the rolling mill in which both the guide roll and the lower roll of the pinch roll are provided so as to be movable up and down has been described. A rolling mill having a configuration in which only the upper roll can be moved up and down is also a rolling mill according to the present invention. That is, in FIG. 4, the lower rolls 2l and 3l of the guide roll and pinch roll are fixedly supported without using an elevating device.

  For example, in the case of the lower guide roll 2 l, the lower roll support frame 17 is provided on the support member 19 to support it, and in the case of the lower pinch roll 3 l, the lower pinch roll chock 3 l is supported and fixed to the housing base 29. Can be configured.

  Also in the case of this rolling mill, the shape control and the sheet passing property can be improved as described above.

  In the above-described embodiment, the backup roll is described as the split backup roll. However, the present invention is not limited to this, and an integrated backup roll may be used.

  Although not shown in FIG. 2, it is needless to say that the lower work roll 1 l can be used in a wider range as long as it can be raised and lowered as necessary.

  The present invention is not limited to the above embodiments, and other examples that do not depart from the gist of the present invention are also included in the present invention.

  According to the present invention, since both the guide roll and the pinch roll formed of a pair of upper and lower rolls are provided on the entry side and the exit side of the rolling mill, the stability of the sheet passing during the rolling is improved and obtained. The shape quality of the steel plate is improved.

  Moreover, since the lower roll of the guide roll and pinch roll consisting of a pair of upper and lower rolls can be raised and lowered, the steel sheet can be raised and lowered in a clamped state in the vertical direction, and the pass line can be freely adjusted. During rolling, the approach angle and the payout angle of the steel sheet with respect to the work roll can be freely adjusted. Therefore, the shape of the steel plate can be improved and the plate passing property can be improved.

  Therefore, a steel plate having an excellent shape can be obtained efficiently.

It is a figure explaining the basic arrangement of the main roll of the rolling mill of the present invention. It is a figure explaining other examples of the basic arrangement of the main roll of the rolling mill of the present invention. It is a figure explaining the example of the roll position of the pass line adjustment in the rolling mill of this invention, (a) is linear arrangement | positioning, (b) is an intermesh arrangement | positioning, (c) shows the other example of an intermesh arrangement | positioning. It is a cross-sectional perspective view which shows the structure of one Example of the rolling mill of this invention. It is a front perspective view which shows the installation condition of the guide roll in FIG. It is a schematic diagram which shows the structure outline | summary of the raising / lowering apparatus (wedge mechanism) in the rolling mill of this invention. It is a schematic diagram explaining the action | operation of the raising / lowering apparatus (wedge mechanism) in the rolling mill of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Work roll 1u ... Upper work roll 1l ... Lower work roll 2 ... Guide roll 2u, 2u '... Upper guide roll 2l, 2l' ... Lower guide roll 3 ... Pinch roll 3u, 3u '... Upper pinch roll 3l, 3l' ... lower pinch roll 4u ... upper divided backup roll 4l ... lower divided backup roll 5 ... reference line 6 ... rolling mill 7 ... mill frame 8 ... housing post 9 ... main reduction device 10 ... inner housing 11 ... housing base 12 ... upper mount 13 ... Lower frame 14 ... Guide roll lifting cylinder 15 ... Upper guide roll support frame 16 ... Upper guide roll support frame 17 ... Lower guide roll support frame 18 ... Lower guide roll support frame 19 ... Support member 20 ... Worm jack 21 ... Worm connecting shaft 22 ... Lower guide roll lifting motor (worm drive motor)
23 ... Guide roll height detector 24 ... Sub post 25 ... Sub frame 26 ... Upper pinch roll lifting cylinder 27 ... Upper pinch roll chock 28 ... Lower pinch roll chock 29 ... Housing base 30 ... Wedge member 31 ... Slide member 32 ... Slide member 33 ... Sliding member 34 ... Wedge drive connecting shaft 35 ... Wedge drive motor 36 ... Roller table S ... Rolled material

Claims (2)

A rolling mill provided with work rolls on the upper and lower sides to roll a steel sheet, and a large-diameter pinch roll consisting of a pair of upper and lower rolls capable of applying a required tension for shape control on the entry side and the exit side of the rolling mill A guide roll comprising a pair of upper and lower rolls having a smaller diameter than the pinch roll is disposed between the large-diameter pinch roll and the work roll. it characterized in that the set, shape controllability and excellent plate rolling mill in sheet passing property. In at least one of the guide roll and the pinch roll , the lower roll is provided so as to be movable up and down so that the height of the pass line of the rolled material can be adjusted up and down from the reference line formed by the upper surface of the roller table and the work roll . it you wherein,請 Motomeko first shape controllability and passing plate excellent in plate rolling mill according.

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