JPS59229214A - Device for detecting camber of rolling material - Google Patents

Abstract

PURPOSE:To obtain a titled device used for computing the curvature or the radius of curvature of the camber of a rolling material by detecting the speeds at or near both side-ends of the material at the outlet side by non-contacting speed meters and performing a computation by adding the sheet width of material. CONSTITUTION:The speeds VR, VL of a rolling material 7 at or near its right and left side-ends are detected by noncontacting speed meters 9, 10 located at the outlet side of material 7. When the sheet width W of material 7 or the distances LR, LL from the center of sheet width to measuring points are obtained, the radius of curvature rho of sheet camber is expressed by equations I and II, and is detected by arithmetic devices 11-13. Further, a curvature is a reciprocal of the radius of curvature rho. Thus the radius of curvature is obtained at any time by a simple device.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for detecting camber generated in a rolled material rolled by a rolling mill during rolling.

Generally, the camber of a rolled material refers to the planar curved shape (lateral curvature) of the rolled material that occurs during rolling.

This camber has a negative effect on the board width of 4 degrees and the rectangular planar shape, and becomes an obstacle to improving product yield and quality. The occurrence of this slump is caused by the uneven elongation of the rolled material on the left and right sides in the width direction. Uneven diameter (uneven wear, uneven heat), ■ Lateral deviation in mill rigidity, ■ Uneven temperature in the width direction of rolled material (unilateral cooling, uneven temperature), ■
There are off-center rolling, ■wedge of rolled material at the entrance of the rolling machine, etc. FIG. 1 schematically shows an example of this camber occurrence. In the figure, (1) is the upper roll of the rolling machine;
(2) is the lower roll, and (EIR) and (SL) are the rolling opening degrees of the right and left sides of the rolling mill, respectively. (8) is the cross section of the rolled material on the entrance side of the rolling mill, (4) is the plane of the rolled material, and (5)
is the cross section of the rolled material on the exit side, and (6) is the plane of the rolled material. In the case of Fig. 1, the rolling opening on the left and right sides of the rolling mill is SR>
81, the elongation of the left side of the rolled material directly under the rolling mill is greater than that of the right side, and the rolled material is curved to the right on the exit side of the rolling mill.

Conventionally, the camber of such a rolled material has been qualitatively determined by an operator, or quantitatively measured off-line using a gauge after rolling. Therefore,
Conventionally, it has not been possible to quantitatively grasp the occurrence of camber online during rolling, so it has been difficult to perform controls such as preventing the occurrence of camber.

Conventionally, as a camber detection device for this rolled material, touch rollers are placed on the left and right sides of the exit side of the rolling machine, and the curvature and radius of curvature of the camber are determined by measuring the length deviation of the exit side of the left and right sides of the rolled material. has already been proposed.

However, with this detection device using a touch roller, it is difficult to measure camber if slip occurs between the material and the touch roller.

This invention has been made in view of the above, and enables quantitative online detection of camber that occurs momentarily during rolling, as well as a non-contact detector for detecting the speed of rolled material. The present invention provides a camber detection device for rolled material that enables reliable camber detection by using a speedometer.

Hereinafter, one embodiment of this A8A will be described based on the drawings.

First, to explain the principle of this invention, as mentioned above,
Camber is caused by the uneven elongation of the rolled material on the left and right sides in the width direction directly under the rolling mill, but ultimately the degree of camber bending is determined by the length of the left and right exit side of the sheet per unit time from directly under the rolling mill. It is determined by the deviation, that is, the speed of the rolled material on the left and right exit sides.

FIG. 2 shows this situation. In Figure 2,
Figures (i) and (B) are for the case where the left and right exit lengths Δξ and Δradius per unit time 9 on the exit side of the rolling mill are equal, that is, when the left and right exit side rolled material speeds VT, , V, are equal. , in this case no camber occurs. On the other hand, (0) in the same figure shows the case where ΔlL>Δrice, that is, the case where V L )VR R, and the material curves to the right.

The speed and camber of the rolled material on the left and right exit sides from directly below the rolling mill
The following relationship holds true with the radius of curvature (see FIG. 6).

■L, Δ1==Δ' L E(p ” L L ) 1
1θ ---(1)-V , IIΔt=Δ1R=(
ρ-LR) eθ --- (2) vI, -vR where vR; Material speed on the right exit side after rolling - vL; Material speed on the left exit side after rolling LR; Material center line - right material speed meter 1j point distance LL; Material center 2-in - Left material speed measurement point center 02 arc angle ρ; Radius of curvature ΔlR; Length on the right exit side of the rolling mill per unit time ΔIL; Length on the left exit side of the rolling mill per unit time Δt ; Unit time Note that when the sign of the radius of curvature ρ is positive, it is defined that the center of curvature is on the right side of the plate center line.

Therefore, when the sign of ρ is negative, it is on the left side, which is 0. Also, since the reciprocal of the radius of curvature ρ, 1/ρ, represents the curvature, the curvature and radius of curvature can be found from equation (3).

Further, if VL and VR are the speeds of the left and right end faces of the rolled material, then equation (3) becomes the following equation.

Here, W: plate width An embodiment of the present invention in which the camber curvature of a rolled material is detected by fully utilizing the above principles will be described with reference to FIG. In this figure, the curvature and radius of curvature are determined by measuring the speed of the material on both the left and right end faces on the exit side of the rolling mill. (7) is the rolled material, (8) is the rolling machine, and (9) is the is the rolled material at both left and right ends (
This is a non-contact speedometer that detects the speed of γ). This non-contact speedometer may be any conventionally known speedometer, for example one based on the principle of the Doppler effect. Further, (11) is a calculation device for the curvature and radius of curvature expressed by the above equation (4).

FIG. 5 shows another embodiment of the present invention, in which the speed of the rolled material on the outlet side of the rolling mill is measured not at both ends but at a position a predetermined distance away from the rolling line center (A). This is how it was done. In the same figure, (121
is a board meter that detects the position in the width direction of the material, and outputs the amount (off-center lid) δ by which the line center (B) of the rolled material is deviated from the rolling line center (A). Also, (18
) is a calculation device that calculates the curvature and radius of curvature expressed by the above equation (8).

As described above, this invention calculates the camber curvature and curvature radius of the rolled material from the left and right rolled material speeds on the exit side of the rolling machine and the Iiyama corresponding to the measurement position of the speed. It is now possible to quantitatively detect the camber online9, and since the speed is detected using a non-contact speedometer, there are no errors caused by slips like with contact-type speedometers. This provides the effect that camber can be detected reliably.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram explaining the state of camber generation, Figure 2
Figures (A) to (0) are explanatory diagrams showing different states for detailed explanation of this invention, and Figure 6 is Figure 2 (0).
), FIG. 4 is a perspective view showing one embodiment of the present invention, and FIG. 5 is a perspective view showing another embodiment of the present invention. (7) Rolled material (8) Rolling mill (9), Non-contact speed meter (111, (Morning) Calculation device (121φ, plate meter) Note that the same reference numerals in the figure are the same. Or indicating the monk part 0 Agent Oiwa Masuo 1st figure opening 3 2nd figure (Mi. @ 4 figure S Oki @ 5 figure)

Claims (1)

[Claims] Non-contact speedometers are installed on both the left and right sides of the exit side of the rolling mill to non-contactly measure the speed of both sides of the rolled material. and a camber detection device for a rolled material, which calculates the curvature and radius of curvature of the camber of the rolled material from the plate width.