JP2004098074A - Mill roll and rolling mill using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mill roll capable of being easily ground without needing equipment cost, and to provide a multiple rolling mill using the mill roll. <P>SOLUTION: The roll 1 has four shape portions, i.e., an extension barrel portion A mainly consisting of a small diameter part not in contact with a reinforcement roll even at any shift position by a sextic function defined by seven points from one side to the other in the axial direction of the roll, a cylindrical roll portion B in contact with the reinforcement roll, a gradually reducing portion C with the diameter gradually reducing from an end part of the cylindrical roll portion B, and a gradually increasing portion D with the diameter gradually increasing from an end part of the gradually reducing portion C. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rolling roll in a multi-high rolling mill and a rolling mill using the same. In addition, the rolling roll refers to a work roll in contact with a material to be rolled, an intermediate roll supporting the work roll, and a roll supporting the intermediate roll.
[0002]
[Prior art]
In a multi-high rolling mill in which the material to be rolled is rolled down by a plurality of rolls, the ability to freely control the width direction distribution of the material to be rolled in a convex or concave shape is a matter of varying conditions. Is necessary to obtain a predetermined plate crown.
[0003]
As means for controlling such a sheet crown, the present applicant has previously proposed a rolling mill as disclosed in Patent Document 1.
[0004]
As shown in FIG. 4 (A), this is a multi-high rolling mill of four or more stages (six stages in the figure), and at least one pair of upper and lower rolls (intermediate rolls 42) can be shifted in the roll axis direction. In addition, the rolls are arranged point-symmetrically and the work roll 41 is provided with a roll bending device, and the upper and lower rolls (intermediate rolls 42) to be shifted are in the roll axial direction as shown in FIG. From one side to the other, an extended barrel portion mainly composed of a small-diameter portion that does not come into contact with the reinforcing roll (stay roll 43) at any shift position: A, a cylindrical roll portion coming into contact with the reinforcing roll (stay roll 43): B, a cylindrical roll It is configured to have four gradually increasing regions whose diameter gradually decreases from the end of the portion: C, and gradually increasing regions whose diameter gradually increases from the end of the gradually decreasing region: D. In the drawing, the overlapping portion of the roll is a portion that is deformed by elastic collapse.
[0005]
Thereby, since the outer peripheral surfaces of both the gradually decreasing region: C and the gradually increasing region: D are inclined in the opposite direction with respect to the axis of the roll, the maximum change amount of the diameter can be greatly reduced, and only the narrow plate having a small width is used. On the other hand, even in the case of a wide plate, not only the roll shift but also the concave crown control and the convex crown control of the rolled material 2 can be performed, and the crown control range can be expanded without excessively increasing the roll contact surface pressure. .
[0006]
Further, by providing the cylindrical roll portion: B, local surface pressure can be prevented, and by providing the extension barrel portion: A, the axial shift and roll bending of the intermediate roll 3 can be performed in the case of a narrow plate. Thereby, the sheet crown of the material to be rolled 2 can be freely controlled through the elastic deformation of the rolling mill.
[0007]
[Patent Document 1]
JP 2001-9505 A
[Problems to be solved by the invention]
By the way, in the rolling mill, the rolling roll is worn out by the rolling operation and changes from the initial shape.If the wear progresses and the shape control function is reduced, the roll is replaced with a regular one. It is reground and re-used. In other words, a plurality of rolls are prepared, and the grinding is repeated and reused.
[0009]
However, in the grinding of the rolling roll having the regions B, C, and D as described above, the region B having no diameter change and the regions C and D must be ground in separate steps, which is troublesome and time-consuming. With a roll grinder of multi-point numerical control, grinding can be performed in one process, but in that case, there is a problem that a large amount of equipment cost is required and input of numerical values is troublesome.
[0010]
The present invention has been made in view of the above-described problems, and has as its object to provide a rolling roll that can be easily ground without requiring equipment cost, and a multi-high rolling mill using the same.
[0011]
[Means for Solving the Problems]
The rolling roll according to the present invention that achieves the above object has an extension mainly from a small-diameter portion that does not contact the reinforcing roll at any shift position, from one side to the other in the roll axis direction by a sixth-order function curve defined by seven points. The barrel portion, a cylindrical roll portion in contact with the reinforcing roll, a gradually decreasing region in which the diameter gradually decreases from the end of the cylindrical roll portion, and a gradually increasing region in which the diameter gradually increases from the end of the gradually decreasing region. It is characterized by being formed.
[0012]
Further, the cylindrical roll portion is characterized in that it has a curved surface whose diameter changes within a range of 1/5 of the diameter change amount in the gradually decreasing region and the gradually increasing region.
[0013]
Furthermore, as a rolling mill using the above-mentioned rolling rolls, it is a multi-high rolling mill of four or more stages, wherein the rolling rolls can be shifted in the roll axis direction and the rolls are arranged point-symmetrically. Features.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is an external view of a shift roll, which is one configuration example of a rolling roll according to the present invention. In the following description, a roll (work roll or intermediate roll) configured to be shiftable in the roll axis direction is simply referred to as a shift roll.
[0015]
The illustrated shift roll 1 includes, from one side to the other in the roll axis direction, an extended barrel portion mainly composed of a small-diameter portion that does not contact the reinforcing roll at any shift position: A, a cylindrical roll portion that contacts the reinforcing roll: B, a cylindrical roll portion And a gradually increasing region whose diameter gradually increases from the end of the gradually decreasing region: C, and a gradually increasing region whose diameter gradually increases from the end of the gradually decreasing region: D.
[0016]
Here, the surface shape excluding the extended barrel portion: A is defined by a higher-order polynomial function of degree 6 or higher in two-dimensional Cartesian coordinates in which the rotation axis direction of the shift roll is the X-axis direction and the radial direction is the Y-axis direction. Shape.
[0017]
That is, the starting point of the cylindrical roll portion: B is d ₁ , the intermediate portion of the cylindrical roll portion: B is d ₂ , and the boundary between the cylindrical roll portion: B and the gradually decreasing region: C (that is, the starting point of the gradually decreasing region: C) is d _3. , tapering region: an intermediate portion of the C d _4, decreasing area: C and increasing area: the smallest diameter portion of the boundary of D (i.e. increasing area: D of the starting point) to d _5, increasing the area: the middle portion of the D d ₆ , and increasing the area: the end point of D and _{d 7 (d} 1 _{~d 7} points has each X, the coordinate value of Y),
The higher-order polynomial function is
y = α ₁ x ⁶ + α ₂ x ⁵ + α ₃ x ⁴ + α ₄ x ³ + α ₃ x ² + α ₆ x + α ₇ + f (x) Expression 1
(Α ₁ , α ₂ , α ₃ , α ₄ , α ₃ , α ₆ , α ₇ are X, Y coordinate values of d ₁ , d ₂ , d ₃ , d ₄ , d ₃ , d ₇ Is a constant whose value is determined by the simultaneous equation method)
and,
| Yd ₁ −Yd ₂ | = ΔdB
| Yd ₅ −Yd ₇ | = ΔdCD,
ΔdB <ΔdCD × 0.1 Equation 2
Is formed by a sixth-order function satisfying the following condition. Note that f (x) in Equation 1 is a correction function for correcting other factors, such as a sine function for correcting roll deflection.
[0018]
By defining the surface shape by such a sixth-order function, when a roll worn by use is reground to a predetermined shape, the roll can be ground by a roll grinder under function control. In other words, grinding can be performed using an expensive multipoint numerically controlled roll grinder without the need for troublesome numerical input. The specified point is not limited to the above configuration example, but can be changed as appropriate.
[0019]
FIG. 2 is a conceptual configuration diagram of a six-high rolling mill using the shift roll 1 as an intermediate roll as described above. The rolling mill of the present invention is a multi-high rolling mill of four or more stages, at least one pair of upper and lower rolls is configured to be shiftable in the roll axis direction, and the rolls are arranged point-symmetrically. Applicable to rolling mills.
[0020]
The illustrated rolling mill 10 includes a work roll 11, an intermediate roll 12, and a stay roll 13 as a reinforcing roll, and a roll bending device that roll-bends the intermediate roll 12, and a shift device that shifts the intermediate roll 12 in the roll axis direction. And the upper and lower rolls are arranged point-symmetrically. In the figure, the lower rolls are indicated by the same symbols as the upper rolls, with the addition of “′ (dash)”. As the roll bending device and the shift device, those having conventionally known configurations can be applied.
[0021]
According to such a rolling mill 10, the intermediate roll 12 can be shifted and roll bending can be performed to control the sheet crown.
[0022]
That is, in the state shown in FIG. 2, the intermediate roll 12 is shifted to the gradually increasing area: D side, and the rolled material 2 is mainly rolled in the gradually decreasing area: C, so that the sheet crown becomes almost flat from the convex crown. Has become. On the other hand, as shown in FIG. 3A, the intermediate roll 12 is shifted to the gradually increasing region: D side, and the material to be rolled 2 is rolled mainly by the cylindrical roll portion: B and the gradually decreasing region: C, and roll bending is performed. 3B, the intermediate roll 12 is shifted to the extended barrel portion: A side, and the tapered area: C, as shown in FIG. The convex crown control can be performed by rolling the material 2 to be rolled in the gradually increasing region B.
[0023]
Here, in regions B, C, and D, in order to transfer the change in the roll shape of the intermediate roll 3 to the deflection of the work roll 11, if the diameter change of the intermediate roll 12 is excessive, the intermediate roll 12 and the reinforcing roll 13 may be used. Or a space is formed between the intermediate roll 12 and the work roll 11, pressure distribution is not transmitted, and it is difficult to efficiently apply a change in the roll shape of the intermediate roll 12 to bending of the work roll 11. Generally, it depends on the rolling conditions. However, when the diameter is large, the radius change amount for preventing this space is said to be about 0.3 mm in radius, so the radius change amount in the areas B, C, and D: ΔdCD is about 0.4 mm. Set not to exceed. On the other hand, if the radius change amount ΔdB of the cylindrical roll portion B is within 10% (within 20% in diameter), it can be ignored within the elastic deformation range and high-order function approximation becomes easy.
[0024]
In order to effectively apply the shape change of the intermediate roll 12 according to the present invention to the material 2 to be rolled in the configuration as shown in the drawing, the areas B, C and D have elastic contact with the stay roll 13 and the work roll 11. As desired, it is effective that the total length of the regions B, C, and D is approximately equal to or longer than the length of the roll barrel of the holding roll 13.
[0025]
According to the rolling mill 10 provided with the shift roll (intermediate roll 12) as described above, both the concave crown control and the convex crown control of the material to be rolled 2 can be performed by the roll shift of the shift roll (intermediate roll 12). In addition, the crown control range can be extended without increasing the roll contact surface pressure.
[0026]
It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the spirit of the present invention. For example, the present invention may be applied to a so-called cluster type mill.
[0027]
【The invention's effect】
As described above, according to the rolling roll of the present invention, from one side to the other in the roll axis direction, the sixth-order function curve defined by seven points mainly includes a small-diameter portion that does not come into contact with the reinforcing roll at any shift position. The extended barrel portion, the cylindrical roll portion in contact with the reinforcing roll, the gradually decreasing region whose diameter gradually decreases from the end of the cylindrical roll portion, and the gradually increasing region whose diameter gradually increases from the end of the gradually decreasing region. By being formed, the roll shift of the rolling roll enables the concave crown control and the convex crown control of the material to be rolled to be performed in a wide range without excessively increasing the roll contact surface pressure. When the worn roll is reground to a predetermined shape, the roll can be ground by a roll grinder under function control. In other words, the grinding can be easily performed using an expensive multi-point numerically controlled roll grinding machine without the need for troublesome numerical input.
[0028]
Further, since the cylindrical roll portion has a curved surface whose diameter changes within 1/5 of the diameter change amount in the gradually decreasing region and the gradually increasing region, approximation by a sixth-order function curve is performed while maintaining the crown control function. Becomes easier.
[0029]
Furthermore, according to the multi-high rolling mill using the above-mentioned rolling rolls, it is a multi-high rolling mill of four or more stages, wherein the rolling rolls can be shifted in the roll axis direction and the rolls are arranged point-symmetrically. With this, the concave crown control and the convex crown control of the material to be rolled can be performed in a wide range without excessively increasing the roll contact surface pressure by the roll shift of the rolling roll, and the roll worn by use is formed into a predetermined shape. When re-grinding, it is possible to easily perform grinding by a function-controlled roll grinder without the need for troublesome numerical input using an expensive multi-point numerically controlled roll grinder.
[Brief description of the drawings]
FIG. 1 is an external view of a shift roll, which is one configuration example of a rolling roll according to the present invention.
FIG. 2 is a conceptual configuration diagram of a six-high rolling mill using a shift roll as an intermediate roll.
FIG. 3 is an explanatory diagram of crown control.
FIG. 4A is a conceptual diagram of a conventional multi-high rolling mill, and FIG. 4B is an outline view of a shift roll thereof.
[Explanation of symbols]
1 shift roll (rolling roll)
2 rolled material 10 multi-high rolling mill 11 work crawl 12 intermediate roll (shift roll)
13 Copy roll (reinforcing roll)
A Extended barrel section B Cylindrical roll section C Gradual decrease area D Gradual increase area

Claims (3)

From one side to the other in the roll axis direction, an extended barrel portion mainly composed of a small-diameter portion that does not come into contact with the reinforcing roll at any shift position, a cylindrical roll portion that comes into contact with the reinforcing roll, and a cylinder by a sixth-order function curve defined by seven points A rolling roll characterized in that it is formed to have four shape portions: a gradually decreasing region in which the diameter gradually decreases from the end of the roll portion, and a gradually increasing region in which the diameter gradually increases from the end of the gradually decreasing region. The rolling roll according to claim 1, wherein the cylindrical roll portion has a curved surface whose diameter changes within 1/5 of the diameter change amount in the gradually decreasing region and the gradually increasing region. The multi-high rolling mill of four or more stages, wherein the rolling rolls can be shifted in the roll axis direction and the rolls are arranged symmetrically with respect to a point. Rolling mill using rolling rolls.

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