JPH10225708A - Method for controlling warping in shape steel rolling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form the warped quantity to zero or a small value so as not to develop any trouble in the pass of a rolled material with a rolling mill at the following step by measuring the warped quantity at the outlet side of a universal rolling mill and executing a feedback control to the warped quantity. SOLUTION: The warped quantity of the rolled material 3 is measured with a warp measuring instrument 7 at the outlet side of the universal rolling mill and the warp signal is outputted to a computing element 8. The computing element 8 controls a roll off-set correcting quantity with the measured value and a model equation and the calculated result is outputted to a controller 9. The controller 9 outputs a control signal to a hydraulic cylinder 10 and tapered plates are displaced 6. Roll chocks 4 supporting vertical rolls 1, 1a are shifted to a pass-line direction with the displacement of the tapered plates 6 and the roll off-set quantity of the vertical rolls 1, 1a is changed. By this method, moment is changed and the warped quantity is made to zero. The feedback control of the roll off-set quantity is executed at a prescribed control cycle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a method for controlling warpage of a shaped steel in universal rolling of a shaped steel such as an I-shape or a channel steel.

[0002]

2. Description of the Related Art Universal rolling is widely used for rolling section steel such as H-section steel. In universal rolling,
By adjusting the roll gap between the horizontal roll and the vertical roll, various types of products can be manufactured. Further, the roll gap is adjusted in accordance with the change in the rolling conditions to improve the dimensional accuracy of the product.

[0003] In the rolling of a section steel, the abdomen (web) surface is rolled in a horizontal state. During rolling of the section steel, warping may occur in the horizontal plane along the pass line. For example, as shown in FIG. 1, when the head 3H of the rolled bar 3 is extended more than the bottom 3L in the longitudinal direction of the rolled material 3 due to the difference in the rolling conditions, the rolled material 3 generates a warp b that curves toward the bottom. In particular, in the case of unequal-shaped steel, warpage is likely to occur because the rolling conditions and dimensions are different between the head and the bottom. Conventionally, after rolling, the warpage was corrected by a tensile torsion correction method, a press correction method, a roller correction method, and the like ("Correcting", edited by the Japan Society for Plasticity Processing, Corona Publishing, January 1992).
See "Straightening of profiles").

[0004]

Heretofore, there has been no attempt to correct the warpage of a rolled bar during rolling. When the warpage increases, it becomes difficult to pass the rolled material through a rolling mill next to the rolling mill in which the warpage has occurred, for example, an edger rolling mill, and the rolling operation may have to be interrupted. Also,
Even if the rolling operation is not interrupted, if the amount of straightening is large, a large amount of power is required to straighten the warp after the end of rolling, and the straightening equipment is large.

SUMMARY OF THE INVENTION The present invention provides a warpage control method in section steel rolling that corrects warpage during rolling, prevents the interruption of the rolling operation due to warpage, and can eliminate or reduce the straightening work in a subsequent process. That is the task.

[0006]

According to the method of controlling warpage in the rolling of a shaped steel according to the present invention, the amount of warping in the height direction of the shaped steel of the rolled material is determined along the length of the rolled material at the exit of the universal rolling mill during rolling. Measure and adjust the offset amount in the pass line direction between the opposing vertical rolls of the universal rolling mill based on the measured warpage amount.

As shown in FIG. 1, if the positions of the opposed vertical rolls 1 and 1a are shifted from each other along the pass line, a bending moment M acts on the rolled material 3. By adjusting the amount of displacement of the vertical rolls 1 and 1a, that is, the offset amount S, the bending moment M changes, and the amount of warpage can be adjusted.

In the warpage control method, a model formula representing the relationship between the warpage amount and the vertical roll offset amount is obtained in advance, and the vertical roll offset correction amount is calculated based on the measured warpage amount and the model formula. The roll offset amount may be adjusted on the basis of. By obtaining the model formula, warpage can be controlled with high dimensional accuracy.

[0009] It is preferable that the displacement of the rolled material in the height direction of the shaped steel is limited by a guide roll on the entrance side of the universal rolling mill, and the rolled material is guided to the universal rolling mill. By guiding the rolled material by the guide roll, the rolled material does not move in the height direction of the shaped steel at the entry side of the universal rolling mill, so that the required bending moment can be accurately given to the rolled material by the offset of the vertical roll.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the above-described warpage control method, the amount of warpage is measured by projecting light such as strobe light or laser light from a side to a shaped steel, and detecting these lights with a one-dimensional or two-dimensional image sensor. To determine the amount of warpage. Further, to adjust the offset amount of the vertical roll, the roll chock supporting the vertical roll is displaced along the pass line by a taper plate (wedge) or a screw mechanism. Since it is necessary to transmit the rolling force by bringing the pressing device into contact with the roll chock, a mechanism (for example, roller contact) for reducing the sliding resistance between the roll chock and the pressing device is provided therebetween.

A model expression representing the relationship between the warpage amount and the vertical roll offset correction amount is obtained as follows.

Roll offset S and rolled material warp b
Is expressed by the following equation. b = C ₁ S + C ₂ (1) C ₁ , C ₂ : constants The constants C ₁ , C ₂ are obtained by a model experiment or the like. FIG.
The relationship between the roll offset amount S and the warpage amount b of the rolled material is shown.

The increment expression of the expression (1) is as follows: Δb = C ₁ ΔS (2) Therefore, assuming that the measured warpage amount is b, the roll offset correction amount ΔS _C for setting the warpage amount to 0 is:
From equation (2), ΔS _C = − (η / C ₁ ) · b ^m (3) η: tuning rate Equation (3) is a model equation. The model formula is
It is stored in advance in a storage unit such as a control computer or an arithmetic device.

FIG. 3 schematically shows an example of a configuration of a universal rolling mill and a control device embodying the present invention.

The roll configuration of the universal rolling mill is shown in FIG.
As shown in FIG. 1, the roll comprises vertical rolls 1 and 1a and a horizontal roll 2. Bottom side vertical roll 1 and horizontal roll 2
Is a flat roll, but the head-side vertical roll 1a is a perforated roll. A taper plate 6 is inserted between a housing 5 and a roll chock 4 supporting a vertical roll. When the taper plate 6 enters and exits at right angles to the pass line, the roll chock 4 moves along the pass line, and the roll offset amount S of the vertical rolls 1 and 1a changes. Opposing vertical rolls 1, 1a
May be simultaneously offset in the opposite direction, or only one of the vertical rolls 1 and 1a may be offset.
In order to smoothly move the roll chock 4, it is important that the two taper plates 6 provided on both sides of the roll chock 4 be moved in the opposite direction in synchronization with each other.

On the exit side of the universal rolling mill, a warp measuring device 7
To measure the warpage of the rolled material 3. The warpage measuring device 7 includes a light source and a linear image sensor (both not shown) for detecting light from the light source, and outputs a warp signal to the arithmetic unit 8. The calculation device 8 calculates the roll offset correction amount ΔS _{C based} on the measured value and the model formula (3), and outputs the calculation result to the controller 9. The controller 9 outputs a control signal to the hydraulic cylinder 10, and the tapered plate 6 connected to the hydraulic cylinder 10 is displaced.

Due to the displacement of the taper plate 6, the roll chock 4 supporting the vertical rolls 1 and 1a moves in the pass line direction, and the roll offset amount S of the vertical rolls 1 and 1a changes. By adjusting the roll offset amount S,
The bending moment M changes, and the amount of warpage becomes zero. The roll offset amount S is feedback-controlled at a required control cycle t. The guide roll 11 arranged near the entry side of the rolling mill limits the displacement of the rolled material 3 in the height direction. As a result, the bending moment for correcting the warp acts on the rolled material 3 accurately.

[0018]

EXAMPLES Under the following rolling conditions, unequal-shaped steel for guide rails was finish universal rolled. (1) Rolling mills and rolls incorporating an automatic warpage control system: Vertical rolls of a universal rolling mill Vertical rolls: (φ) 250 mm x 200 mm (l) (2) Warpage measuring device: Image sensor system Distance from roll center to image sensor : L = 1.5 m (3) Material: ordinary steel (4) Dimensions of material on the rolling side (refer to Fig. 5 for dimension symbols of shaped steel) H = 147.8 mm (total height) H _H = 43.9 mm B _H = 63.9 mm H _W = 73.6 mm B _W = 17.7 mm _HL = 30.4 mm B _L = 121.5 mm (5) Material temperature at the inlet side (set value): 1000 ° C (6) Vertical roll reduction r = (1-h / H) × 100
= 5.8% where h is the total height of the material on the exit side of the roll. (7) Control cycle: 2 sec. (8) Rolling speed: 200 m / min In the case of the conventional method, the offset amount S of the left and right vertical rolls S = 0.
Rolling in the condition of L, b = 13mm at L = 1.5m position
(Curvature K _C = 1.2 × 10 ⁻⁵ l / mm 2). On the other hand, in the case of the present invention, it was possible to roll a good unequal-shaped steel without warpage.

[0019]

According to the present invention, since the amount of warpage is measured on the exit side of the universal rolling mill and the warpage is feedback-controlled, the amount of warpage can be reduced to zero or small. Therefore, there is no problem in the path of the rolled material in the next rolling mill. Further, even if the warpage remains, when the warpage is corrected in a subsequent step, the correction is easy because the warpage is small, and the warpage can be almost eliminated. As a result, productivity and product yield can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of adjusting the amount of warpage according to the present invention.

FIG. 2 is a graph showing a relationship between a roll offset amount S and a warped amount b of a rolled material.

FIG. 3 is a drawing schematically showing an example of a configuration of a universal rolling mill and a control device embodying the present invention.

4 is a drawing showing an example of a roll configuration of the universal rolling mill shown in FIG.

FIG. 5 is a drawing showing symbols for dimensions of each section of a shaped steel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1a Vertical roll 2 Horizontal roll 3 Rolled material 4 Roll chock 5 Housing 6 Taper plate 7 Warpage measuring device 8 Computing device 9 Controller 10 Hydraulic cylinder 11 Guide roll S Roll offset amount

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yukio Noguchi 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Corporation Technology Development Division

Claims (3)

[Claims] In a method for correcting warpage of a shaped steel, a warping amount in a height direction of a shaped steel of a rolled material is measured along a rolled material length direction at a roll-out side of a universal rolling mill during rolling, and the measured warpage amount is measured. A method of controlling warpage in section steel rolling, wherein the offset amount in the direction of the pass line between the opposing vertical rolls of the universal rolling mill is adjusted based on the following. 2. A model expression representing the relationship between the amount of warpage and the offset amount of the vertical roll is obtained in advance, and the offset correction amount of the vertical roll is calculated based on the measured warpage amount and the model expression. 2. The warpage control method according to claim 1, wherein the offset amount is adjusted. 3. The warpage control method according to claim 1, wherein a displacement of the rolled material in the height direction of the shaped steel is limited by a guide roll on the entrance side of the universal rolling mill, and the rolled material is guided to the universal rolling mill.