JP2005066695A - Plate rolling machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plate rolling machine capable of effectively controlling a distribution in a width direction of a rolled material in a concave shape and easily performing a roll shift during rolling.
SOLUTION: A pair of work rolls 22 that sandwich and reduce a plate material 1 between them, a plurality of leveling rolls 24 that suppress deformation of the work rolls, and an intermediate roll 10 that is sandwiched between the work rolls and the leveling rolls. With. The intermediate roll 10 is configured to be shiftable. The intermediate roll has a contact roll portion 12 that comes into contact with the holding roll, and an extended barrel portion 13 that is connected to one end of the contact roll portion and does not come into contact with the holding roll at any shift position. The contact roll part 12 has a convex shape that places the convex center 15 on the side of the extension barrel.
[Selection] Figure 2

Description

  The present invention relates to a plate rolling machine that reduces a plate material between work rolls.

In a plate rolling machine in which a sheet material is sandwiched between a pair of work rolls and rolled down, the distribution in the width direction of the rolled material can be controlled to be convex or concave, which is necessary to obtain a predetermined sheet crown under various conditions. It becomes.
As means for controlling the plate crown, Patent Document 1 has already been disclosed, and Patent Document 2 has been filed.

As shown in FIG. 10, the “rolling mill” of Patent Document 1 has a pair of rolls 51 that form a roll crown whose curvature changes over the entire length of the roll barrel and is point-symmetric with respect to the center of the rolling mill. In the rolling mill arranged to be
The roll crown is formed so that the entire roll barrel has a convex shape, and its maximum diameter portion 53 is positioned so as to be offset in the axial direction with respect to the longitudinal center 52 of the roll, and has a left-right asymmetric shape. Further, the roll is configured to be movable in the axial direction.

  As shown in FIG. 11, the “rolling roll and rolling mill using the same” in Patent Document 2 are defined by seven points in which the rolling roll (in this example, the intermediate roll 63) is from one to the other in the roll axis direction. By the sixth-order function curve, the diameter gradually decreases from the extended barrel portion A mainly composed of a small diameter portion that does not contact the reinforcing roll 64 at any shift position, the cylindrical roll portion B that contacts the reinforcing roll, and the end portion of the cylindrical roll portion. It is formed to have four shape portions, a gradually decreasing region C and a gradually increasing region D in which the diameter gradually increases from the end of the gradually decreasing region. In this figure, 62 is a work roll.

Japanese Patent Publication No. 5-13726 Japanese Patent Application Laid-Open No. 2004-98074, “rolling roll and rolling mill using the same”

In the rolling mill of Patent Document 1, it is not easy to shift the roll during rolling because a rolling load is applied.
Further, in the rolling mill of Patent Document 1, since the shape of the intermediate shift roll is a middle concave shape, it is effective to control the plate crown to be convex as shown in FIG. There is a problem that is not effective in controlling the concave shape as shown in FIG.
Further, in the conventional rolling mill, (1) it is difficult to control the plate shape when the plate width is narrow, and (2) it is difficult to grind if there is a break in the uneven curve when the shift roll is uneven. Since the whetstone has a width, if there are break points, there are problems such as the biting of the whetstone is large and the roll shape is broken.

  The present invention has been developed to solve such problems. That is, the object of the present invention is to effectively control the distribution in the width direction of the rolled material in a concave shape, and to easily perform roll shift during rolling, and to easily exert a plate shape control effect even when the plate width is narrow. An object of the present invention is to provide a plate rolling machine that is easy to grind because there are no break points in the uneven curve.

According to the present invention, a pair of work rolls that sandwich and reduce a plate material, a plurality of holding rolls that suppress deformation of the work rolls, and an intermediate roll that is held between the work rolls and the holding rolls. In the plate rolling machine, the intermediate roll is configured to be shiftable,
The intermediate roll has a contact roll portion that comes into contact with the holding roll, and an extended barrel portion that is connected to one end of the contact roll portion and does not come into contact with the holding roll at any shift position.
The said contact roll part has a convex shape which puts a convex center in the side of an extension barrel, The plate rolling machine characterized by the above-mentioned is provided.

According to a preferred embodiment of the present invention, the extension barrel portion is obtained by subtracting the narrow width control width L _WN from the barrel length L _B of the scale roll assuming a plate width of a representative narrow width W _N that places importance on production. has approximately half weak torso length _{L E} of the amount,
The contact roll part is
A three-point roll of A, B, and C having a roll-shaped curve adjacent to the extended barrel portion and having an outer diameter that changes from A → B → C, with the B-point protrusion amount of the roll-shaped curve being a predetermined amount _RC A convex portion having a length of the trunk length LWN that is a curve having a gradient value of 0 with respect to the axial direction;
Adjacent to the convex portion, a first straight portion of the length of the barrel length L _R minus the barrel length L _WN of the body length L _E and the convex portion of the extension barrel from the barrel length L _B of the copy roll,
A second linear portion of the length of the barrel length L _E following the first linear portion, made of.

Further, according to the present invention, a pair of work rolls that sandwich and reduce a plate material, a plurality of holding rolls that suppress deformation of the work rolls, and an intermediate roll that is held between the work rolls and the holding rolls In the plate rolling machine, the intermediate roll is configured to be shiftable,
The intermediate roll has a contact roll portion that comes into contact with the holding roll, and an extended barrel portion that is connected to one end of the contact roll portion and does not come into contact with the holding roll at any shift position.
Assuming a plate width of a representative narrow width W _N that places importance on production, the extension barrel portion has a barrel length that is almost less than a half of the amount obtained by subtracting the narrow width control width L _WN from the barrel length L _B of the holding roll. L _E
The contact roll part is
Adjacent to the extended barrel part, a straight part of the trunk length L _WN ,
Adjacent to the straight portion, and the gradually decreasing portion of the barrel length L _K obtained by subtracting the sum of the cylinder length extended barrel portion and a linear portion _(L E ₊ L _WN) from the body length LB of copy roll,
Adjacent to the tapering part consists of a gradually increasing section of the body length L _E,
The gradual decrease portion and the gradual increase portion have a roll shape curve whose outer diameter changes from C → D → E, the gradient value with respect to the roll axis direction at point C of the roll shape curve is 0, and then the axial direction There is provided a plate rolling machine characterized in that the roll diameter is increased again after decreasing, and the roll diameter at point E is larger than the roll diameter at point C.

According to a preferred embodiment of the present invention, a work roll bending means for applying a bending moment to both ends of the work roll is provided.
In addition, intermediate roll bending means for applying a bending moment to both ends of the intermediate roll is provided.
The intermediate roll may be a six-stage mill or a cluster mill intermediate roll.

According to the configuration of the present invention, since the intermediate roll is configured to be shiftable, it is possible to control the shape by shifting the intermediate roll without shifting the work roll, and the rolled plate is scratched. Hateful.
In addition, since the contact roll portion of the intermediate roll has a convex shape with the convex center on the side of the extension barrel, shifting the convex centers of the upper and lower intermediate rolls toward each other makes the plate in the concave crown direction. It can be controlled easily.

Furthermore, since it has the extended barrel part which is connected to one end of the contact roll part and does not contact the holding roll at any shift position, the plate crown control during rolling by roll bending can be effectively performed.
Accordingly, by setting the basic setting in advance by the roll shift of the intermediate roll and performing the sheet crown control during rolling by roll bending, it is possible to cope with sheet crown fluctuation during rolling.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted.

FIG. 1 is a side view of an intermediate roll constituting the plate rolling machine of the present invention. In this figure, (A) and (B) show a slightly different profile, but the basic structure is the same.
The intermediate roll 10 shown in FIGS. 1A and 1B has a contact roll portion 12 and an extended barrel portion 13 arranged in series between the support shafts 10a at both ends.

The contact roll portion 12 has a convex profile in which the convex center 15 is located on the side of the extension barrel, and at least a part of the contact roll portion 12 is always in contact with the holding roll.
The extension barrel portion 13 is connected to one end of the contact roll portion 12 on the side close to the convex center 15 and has a profile that does not contact the leveling roll at any shift position when the intermediate roll is shifted. In this example, the profile of the extension barrel portion 13 is a prefix conical shape, but is not limited thereto, and may be, for example, a cylindrical shape. In this figure, 14 is the center position in the width direction of the contact roll portion.

  FIG. 2 is an overall configuration diagram showing the first embodiment of the plate rolling machine of the present invention. The plate rolling machine of the present invention includes a pair of work rolls 22 that sandwich and reduce a plate material 1 (rolled sheet), a plurality of holding rolls 24 for suppressing deformation of the work rolls 22, and work rolls 22. And the intermediate roll 10 sandwiched between the holding rolls 24.

  The plate rolling machine of the present invention may be a 6-stage mill or a cluster mill, and the intermediate roll 10 may be an intermediate roll of a 6-stage mill or a cluster mill. That is, in the 6-stage mill, a pair of leveling rolls 24 and an intermediate roll 10 are used corresponding to a pair of work rolls 22, respectively. On the other hand, in the cluster mill, for example, as illustrated in FIG. 5, two or more pairs of cutting rolls 24 and two or more pairs of intermediate rolls 10 (indicated by diagonal lines) are associated with a pair of work rolls 22. Use. In this figure, reference numeral 26 denotes a central holding roll.

  Hereinafter, the case of a 6-stage mill will be described with reference to FIG. The same applies to the cluster mill.

  In FIG. 2, each intermediate roll is configured to be shiftable in the axial direction by a roll shift means (not shown). Further, intermediate roll bending means (not shown) for applying a bending moment 16 to both ends of the intermediate roll 10 is provided. Furthermore, in this example, work roll bending means (not shown) for applying a bending moment 23 to both ends of the work roll 22 is provided.

  A well-known mechanism can be applied as it is to the roll shift means, the intermediate roll bending means, and the work roll bending means.

  The pair of work rolls 22 are relatively small-diameter cylindrical rolls suitable for biting the plate material 1, have a relatively small bending rigidity, and the axis is bent along the profile of the intermediate roll 10. Note that the profile of the work roll 22 can be slightly controlled by the work roll bending means.

  The cutting roll 24 is a relatively large-diameter cylindrical roll supported by the support shafts 24a at both ends, and has a relatively high bending rigidity. Therefore, it comes into contact with the profile of the intermediate roll 10, hits with a high surface pressure near the convex center 15 of the intermediate roll 10, and bends the axis of the intermediate roll 10 and deforms the profile. The broken line in the figure schematically shows the profile of the contact roll portion 12 before deformation.

  FIG. 2 shows a state where the convex centers 15 of the upper and lower intermediate rolls are shifted toward each other. Since the contact roll portion 12 of the intermediate roll 10 has a convex shape that places the convex center 15 on the side of the extension barrel, by shifting the convex centers 15 of the upper and lower intermediate rolls closer to each other as shown in this figure, The plate 1 can be controlled in the direction of the concave crown.

  FIG. 3 shows a state where the convex centers 15 of the upper and lower intermediate rolls are shifted in a direction away from each other. The plate 1 can also be controlled in the convex crown direction by shifting the convex centers 15 of the upper and lower intermediate rolls away from each other as shown in this figure.

Further, since the extended barrel portion 13 that is connected to one end of the contact roll portion 12 and does not contact the holding roll at any shift position, the plate crown control during rolling by the roll bending 16 can be effectively performed.
Accordingly, by setting the basic setting in advance by the roll shift of the intermediate roll and performing the sheet crown control during rolling by roll bending, it is possible to cope with sheet crown fluctuation during rolling.
Furthermore, since the intermediate roll is configured to be shiftable, the shape of the intermediate roll can be controlled by shifting the intermediate roll without shifting the work roll, and the additional effect that the rolled sheet is hardly damaged can be obtained. can get.

FIG. 6 is an overall configuration diagram showing a third embodiment of the plate rolling machine of the present invention.
In this example, the extension barrel portion 13 is assumed to be a plate width of a representative narrow width WN that places importance on production, and is almost less than a half of the amount obtained by subtracting the narrow width control width L _WN from the barrel length L _B of the cutting roll. with a body length _{L E.}
Further, the contact roll portion 12 includes a convex portion 32, a first straight portion 34, and a second straight portion 36.
The convex portion 32 is adjacent to the extended barrel portion 13 and has a roll shape curve whose outer diameter changes from A → B → C. Further, the length of the body length L _WN is a curve in which the slope value of the three points A, B, and C with respect to the roll axis direction is 0 with the B point protrusion amount of the roll shape curve as a predetermined amount _RC .
The first straight portion 34 is adjacent to the convex portion 32 has a length of barrel length L _R of the cylinder length L _B of the copy roll minus the barrel length L _WN of the body length L _E and the convex portion of the extension barrel .
The second straight portion 36 has a length of barrel length _{L E} subsequent to the first straight portion 34.
The narrow width control width L _WN is preferably 10-30 mm larger than the representative narrow width W _N.
The point B protrusion amount _RC is set to a value as large as possible within a range in which rolling mill vibration does not occur.
If the center position of the narrow width control width L _WN is positioned at the center of the rolling mill, the effect on the plate shape of the roll protrusion is great. At this time, the barrel length _{L R} = body length _{L E.}
In a rolling mill with a large roll deflection, the roll protrusion compensates the roll deflection, so the mill of FIG. 6 is effective.

FIG. 7 is an explanatory diagram of the roll shape of the convex portion 32 of the third embodiment. The convex portion 32 needs to be bilaterally symmetric about the point B, and the gradient value of the three points A, B, and C with respect to the roll axis direction needs to be zero.
FIG. 7A is an example in which the roll shape of the convex portion 32 is given by a sine wave curve, and the convex portion (-90 ° to + 270 ° sine wave curve protrusion is given in the narrow width control width L _WN portion ( L _WN part).
FIG. 7B is an example in which the roll shape of the convex portion 32 is given by an even-order high-order function, and the coefficients a, b, c are calculated from the protrusion amount c of the B point with respect to the points A, C and the positions of the A, C points. Can be requested.

FIG. 8 is an overall configuration diagram showing a fourth embodiment of the plate rolling machine of the present invention.
In this example, the extension barrel portion 13 is assumed to have a plate width of a representative narrow width W _N that places importance on production, and is approximately ½ of the amount obtained by subtracting the narrow width control width L _WN from the barrel length L _{B of} the leading roll. with a body length _{L E} of the weak.
The contact roll portion 12 includes a straight portion 42, a gradually decreasing portion 44, and a gradually increasing portion 46.
The straight line portion 42 is a portion adjacent to the extension barrel portion 13 and having a constant diameter of the trunk length L _WN .
The gradually decreasing portion 44 is adjacent to the straight portion 42, and the diameter of the body length L _K obtained by subtracting the sum (L _E + L _WN ) of the length of the extended barrel portion 13 and the straight portion 42 from the body length LB of the holding roll 24 gradually decreases. It is a part to do.
Gradually increasing section 46 is adjacent to the decreasing portion is a portion for increasing the diameter of the cylinder length L _E.
Further, the gradually decreasing portion 44 and the gradually increasing portion 46 have a roll shape curve whose outer diameter changes from C → D → E. The gradient value of the roll shape curve with respect to the roll axis direction at point C is 0, then the roll diameter decreases in the axial direction and then increases again, and the roll diameter at point E becomes thicker than the roll diameter at point C. It is configured as follows.

FIG. 9 is an explanatory diagram of roll shapes of the gradually decreasing portion 44 and the gradually increasing portion 46 of the fourth embodiment.
In this example, the roll shapes of the gradual decrease portion 44 and the gradual increase portion 46 are given by a cubic function, and the coefficients a, b, and c are obtained from the projection amounts of the D and E points with respect to the C point and the positions of the D and E points. be able to.

The rolling mill of FIG. 8 is suitable for a rolling mill with a small roll deflection. In a rolling mill with a small roll deflection, the plate crown tends to become a concave crown due to the thermal crown of the work roll, so the effect of C → D → E has the effect of reducing the concave crown of the plate.
It is also desirable that work roll bending F _WB can be provided, and that intermediate roll bending F _IB can also be provided.

According to the embodiment of FIGS. 6 to 8, a narrow plate has a local curve defined within the plate width of a product type that places importance on production, and this local curve is adjacent to the extended barrel portion. The width direction plate thickness distribution control can be reliably performed for the products which place importance on production.
In addition, since the roll shape in the trunk length is configured so as not to have a break point except for the extension barrel part, there is no break point in the roll shape change curve, the biting of the grinding wheel is small, and the roll shape error is small. small.

  In addition, this invention is not limited to embodiment mentioned above, Of course, it can change variously in the range which does not deviate from the summary of this invention.

It is a side view of the intermediate roll which comprises the plate rolling machine of this invention. It is a whole lineblock diagram showing a 1st embodiment of a plate rolling machine of the present invention. It is a figure which shows another usage pattern of the plate rolling machine of FIG. It is explanatory drawing of a convex crown and a concave crown. It is a whole block diagram which shows 2nd Embodiment of the plate rolling machine of this invention. It is a whole block diagram which shows 3rd Embodiment of the plate rolling machine of this invention. It is roll shape explanatory drawing of 3rd Embodiment. It is a whole block diagram which shows 4th Embodiment of the plate rolling machine of this invention. It is roll shape explanatory drawing of 4th Embodiment. 2 is a schematic diagram of a “rolling mill” in Patent Document 1. FIG. It is a schematic diagram of the "rolling roll and rolling mill using the same" of patent document 2.

Explanation of symbols

1 plate material (rolled plate), 10 intermediate roll, 10a support shaft,
12 contact roll part, 13 extension barrel part,
14 center position in the width direction, 15 convex center,
16 Bending moment,
22 work rolls, 23 bending moments,
24 holding roll (both sides holding roll), 24a support shaft,
26 Central roll,
32 convex part, 34 1st straight part, 36 2nd straight part,
42 Straight line part, 44 Gradual decrease part, 46 Gradual increase part

Claims (6)

A pair of work rolls sandwiched between the work rolls, a plurality of leveling rolls for suppressing deformation of the work rolls, and an intermediate roll sandwiched between the work rolls and the leveling rolls, the intermediate rolls Is a plate rolling machine configured to be shiftable,
The intermediate roll has a contact roll portion that comes into contact with the holding roll, and an extended barrel portion that is connected to one end of the contact roll portion and does not come into contact with the holding roll at any shift position.
The said contact roll part has a convex shape which puts a convex center near the extension barrel side, The plate rolling machine characterized by the above-mentioned. Assuming a plate width of a representative narrow width W _N that places importance on production, the extension barrel portion has a barrel length that is almost less than a half of the amount obtained by subtracting the narrow width control width L _WN from the barrel length L _B of the holding roll. L _E
The contact roll part is
A three-point roll of A, B, and C having a roll-shaped curve adjacent to the extended barrel portion and having an outer diameter that changes from A → B → C, with the B-point protrusion amount of the roll-shaped curve being a predetermined amount _RC A convex portion having a length of the body length L _WN that is a curve having a gradient value of 0 with respect to the axial direction;
Adjacent to the convex portion, a first straight portion of the length of the barrel length L _R minus the barrel length L _WN of the body length L _E and the convex portion of the extension barrel from the barrel length L _B of the copy roll,
Plate rolling mill of claim 1, and a second linear portion of the length of the barrel length L _E following the first linear portion, that it consists characterized. A pair of work rolls sandwiched between the work rolls, a plurality of leveling rolls for suppressing deformation of the work rolls, and an intermediate roll sandwiched between the work rolls and the leveling rolls, the intermediate rolls Is a plate rolling machine configured to be shiftable,
The intermediate roll has a contact roll portion that comes into contact with the holding roll, and an extended barrel portion that is connected to one end of the contact roll portion and does not come into contact with the holding roll at any shift position.
Assuming a plate width of a representative narrow width W _N that places importance on production, the extension barrel portion has a barrel length that is almost less than a half of the amount obtained by subtracting the narrow width control width L _WN from the barrel length L _B of the holding roll. L _E
The contact roll part is
Adjacent to the extended barrel part, a straight part of the trunk length L _WN ,
A gradually decreasing part of the body length L _K adjacent to the straight part and subtracting the sum of the length of the extended barrel part and the straight part (L _E + L _WN ) from the body length L _B of the holding roll;
Adjacent to the tapering part consists of a gradually increasing section of the body length L _E,
The gradual decrease portion and the gradual increase portion have a roll shape curve whose outer diameter changes from C → D → E, the gradient value with respect to the roll axis direction at point C of the roll shape curve is 0, and then the axial direction A plate rolling machine, wherein the roll diameter is increased again after being reduced, and the roll diameter at point E is larger than the roll diameter at point C.   The plate rolling machine according to any one of claims 1 to 3, further comprising work roll bending means for applying a bending moment to both ends of the work roll.   The plate rolling machine according to any one of claims 1 to 3, further comprising intermediate roll bending means for applying a bending moment to both ends of the intermediate roll. The said intermediate roll is an intermediate roll of a 6-high mill or a cluster mill, The plate rolling machine in any one of Claims 1 thru | or 3 characterized by the above-mentioned.

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