JPS6233014A - Camber detecting method for steel plate - Google Patents

Abstract

PURPOSE:To detect real cambers of a straightened steel plate by measuring a distance to a steel plate delivered from a roller leveler by a range finder and calculating a relation-ship between a distance taking into account of the dead weight shown in the specifications of the steel plate and a real camber quantity by a calibration unit. CONSTITUTION:A distance (l) to a delivered steel plate W is measured by a range finder 2 set at a prescribed distance X from the last roller 10 of a roller leveler 1. The material specifications such as the thickness, strength or base material quality, yield point, and heat treatment conditions and a dis tance L taking account of effect of the dead weight in a cantilever state of the steel plate W and data related to cambers of + or -h are stored in a calibration unit 3. therefore, a real camber quantity (h) of the plate W is detected based on the distance (l). The calibration unit 3 operates so that a shape controller 4 corrects an upper roller position of the roller leveler 1 to bring the distance (l) to be a distance (l0) by which a real camber is zero, to make the real cam ber quantity zero, and to improve and stabilize a shape quality of the plate W.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a warpage detection method for detecting warp in a steel plate during a straightening process using a roller leveler when manufacturing a steel plate from a hot rolled steel strip.

[Conventional technology]

Conventionally, when manufacturing a steel plate from a hot-rolled steel strip, there is generally a straightening process using a roller leveler device, as shown in FIG. The purpose of this straightening is to remove the curls that remain when the coiled copper strip is unwound, and to obtain a steel plate with less warp.The actual work for this purpose is as follows:
Experimentally find out the constant rolling reduction fjkv of the roller leveler according to the specifications of the steel plate to be straightened, and while visually observing the steel plate after straightening according to the set value of the rolling reduction amount, determine the rolling reduction amount according to the operator's experience and 1. The setting values were adjusted. However, generally when checking a steel plate, the steel plate is placed on top of the steel plate, which hides the warpage caused by elastic deformation due to the steel plate's own weight. Therefore,
The actual warpage can be determined by hanging the steel plate as shown in FIG. 5, but when the steel plate is placed on a surface plate, the weight of the steel plate hides the warp. That is, it is difficult to determine the true warpage by simply visually observing the steel sheet after straightening, and even if it is determined that the steel sheet is good, the warpage may not be sufficiently removed.

For this reason, when setting the rolling reduction amount of the roller leveler, it is necessary to suspend the steel plate each time to confirm whether the set rolling reduction amount is correct or not, which significantly impairs work efficiency and reduces productivity in actual work. As a result, work based on experience and ``cans'' was dominant.

[Problem that the invention seeks to solve]

In the conventional method for straightening warpage of a steel plate using a roller leveler device as described above, it is necessary to suspend the steel plate each time the reduction amount is set and check whether the set value is correct or not. This results in significant damage and a significant drop in productivity, so the correction work relies on the experience and "kun" of workers, making it difficult to stabilize the quality of the steel sheet shape.

This invention provides leveler straightening for steel plates or copper strips.
The purpose is to eliminate the shadow of self-weight, detect the true warpage of a steel plate, and stabilize the shape quality of the steel plate.

[Means for resolving ties]

The steel plate warpage detection method according to the present invention measures the distance from the roller leveler device to the steel plate discharged from the roller leveler device using a distance meter, and based on this measurement result, the true value is calibrated for each material use and stored in the calibration device. The true warpage of the steel plate is detected based on the relationship with warpage.

[For production]

In the method for detecting warpage of a steel plate according to the present invention, a distance meter is placed at a predetermined distance from the final roller of the roller leveler device, and the relationship between the distance detected by the rangefinder to the steel plate at this position and the true warpage is calibrated. This relationship is stored in the device and calibrated according to the material specifications such as plate thickness and strength, and the true warp is detected based on the calibrated relationship with the true warp using the distance meter measurement value. do.

[Embodiments of the invention]

FIG. 1 is a block diagram of a method for detecting warpage of a copper plate according to an embodiment of the present invention. (1) is a roller leveler device that corrects warpage of a steel plate having curls that is conveyed from the direction of the arrow. (1a) is the final roll of the roller leveler (1), and (2) is a predetermined distance (') from the final roll (1a).
) Distance to the steel plate after correction with the distance meter placed at the O position! (1) is detected. (3) is a calibration device, which stores the relationship between the detection distance (ri) and the true warp I!k(h) shown in Fig. 5. (4) is a shape control device, which is controlled by its output control signal. Set the rolling reduction amount of the roller leveler device (1). Note that (g) is a steel plate.

Next, a detection method of the steel plate warp detection device configured as described above will be described. The steel plate (W), whose warped shape is corrected by the roller leveler (1), is straightened while being restrained by the leveler, and sent out from the final roller (1a). When it is fed out, it hangs down until it touches the exit side equipment of the roller leveler (1), and the height depends on the equipment where it touches. Therefore,
If the rangefinder (2) is installed too far away, it will not be possible to detect warpage;
) If the steel plate (w) is placed close to the leveler equipment, it will be restricted due to the leveler equipment, and the thinner the steel plate (w) is, the lower the strength of the material, the greater the sag. The roller is placed at a distance (X) from the final roller (la) in consideration of the following. Therefore, for a steel plate ■ that has been straightened and has zero warpage, the distance detected by the distance meter (2) is the distance from the distance meter (2) to the pass line of the roller leveler (1) minus the plate thickness. It becomes larger by the influence of the steel plate (W)'s own weight. In this way, true warpage (
h) and the distance m C1) measured by the rangefinder (2), as shown in Figure 3, the calibration device (3 ), the true warp it (h) can be determined by detecting the distance (J) ri: from the final roll (1a) to the steel plate (W) sent out from the final roll (1a) using the distance meter (2). . Then, based on this true warpage amount (h), the shape control device (4) outputs a reduction amount setting signal to the roller leveler device (1) so that the true warpage fi (h) becomes zero. Controls the shape of the steel plate (uV).

In addition, the true amount of warpage (h) stored in the calibration device (3)
) and detection distance (J) for each material specification of the steel plate (SV), such as plate thickness, strength, base material, yield point, etc.
By calibrating and memorizing the heat treatment conditions, etc., you can know the current true warpage size of the steel plate (W) that has passed through the roller leveler device (1), even if the steel plate (W) has different material specifications. be able to.

In addition, in the above embodiment, the steel plate (V
/), but according to the above-mentioned related data stored in the calibration device (3) when carried out using a cutting board,
The same can be applied to coiled levelers.

〔Effect of the invention〕

As explained above, this invention measures the distance to the steel plate with a distance meter installed on the exit side of the roller leveler device, and calculates the relationship between the distance to the steel plate and the true amount of warpage stored in the calibration device and calibrated according to the material specifications. Since the true amount of warpage is detected, the pulley of the rolling reduction amount in the roller leveler device can be optimally cleaned, and the shape quality of the steel plate is improved and stabilized.

[Brief explanation of drawings]

FIGS. 1 to 3 are diagrams showing an embodiment of the present invention,
Figure 1 is a configuration diagram of a roller leveler device including a steel plate warpage detection device, Figure 2 is an explanatory diagram showing the warpage of a steel plate, and Figure 3 shows the relationship between the distance detected by a rangefinder and the true warp. Fig. 4 is a side view of a conventional roller leveler device, and Fig. 5 is an explanatory diagram showing true warpage. In the figure, (1) is the roller leveler equipment ffi, (2
) is a distance meter, (3) is a calibration device, (4) is a shape control device, and (W) is a steel plate. Agent Patent Attorney Tadashi Sato Year 1 Figure 1 Rollere N Fu 2 E-Kyo I! Total 3 Calibration vlx 4 Type 4 Large 1 Rigoma 1 w Gold amount Class 4th figure 5th figure

Claims (1)

[Claims] The distance from the roller leveler device to the steel plate discharged from the roller leveler device is measured using a distance meter, and based on this measurement result, the true warp of the steel plate is calculated based on the relationship with the true warp that is calibrated for each material use and stored in the calibration device. A method for detecting warpage in a steel plate, characterized in that the method detects warpage in a steel plate.