JP2002126812A - Rolling method and equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize lowering of the rolling efficiency and to improve qualities such as thickness accuracy of an end portion of the steel plate by tracking the position of the end portion in the longitudinal direction of the steel plate and by controlling a decelerating timing before engagement and an accelerating timing after engagement. SOLUTION: An engaged end of the steel plate 10 to be transferred is detected by a sensor 22 for the steel plate and based on the detecting signal and the transfer speed of the steel plate after passing through the sensor, the engaged end position in transit is computed and based on the information on the engaged position computed, a transfer speed at which the steel plate 10 is engaged into the rolling mill 20 is controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for rolling a material to be rolled, and more particularly to a rolling method suitable for use in rolling a thick plate, capable of improving both the rolling efficiency and the quality. And an apparatus.

[0002]

2. Description of the Related Art Generally, a rolling speed and a conveying speed in a plate rolling are set to a speed corresponding to an operation amount when a rolling mill or a conveying table is manually operated, and at a set acceleration rate in an automatic control. It accelerates and is controlled to the target speed.

[0003]

In such a rolling method, if the set acceleration rate or target speed of the rolling mill or the transfer table is large, the rolling efficiency is improved, but the longitudinal end of the steel sheet to be rolled is improved. There was a problem in quality, such as the thickness accuracy in the part. Conversely, if the acceleration rate or the target speed is reduced, the quality is improved, but there is a problem that the rolling efficiency is reduced.

[0004] In order to solve such a problem, even if an attempt is made to reduce the conveying speed before biting, if the timing is too fast, efficiency is reduced, and if the timing is too slow, biting occurs without deceleration. With conventional methods, without slowing down,
They accelerated at a constant acceleration rate and engaged at the target speed.

[0005] In addition, the rolling speed after biting is conventionally controlled to a target rolling speed by accelerating at a certain timing after biting with respect to the conveying speed at biting. If the speed is early, the efficiency is increased but the quality is reduced. Conversely, if the acceleration timing is late, the quality is improved but the efficiency is reduced.

As described above, in the conventional method, since the position of the end portion in the longitudinal direction of the steel sheet is not known, the acceleration rate and the target speed of the transfer table, the acceleration timing and the acceleration rate of the rolling mill after biting, and the target speed are constant. Was given by value.

Japanese Unexamined Patent Publication (Kokai) No. 54-145350 discloses that the conveyed material to be rolled is detected by a detector provided in front of the rolling roll, and the detection signal is used to detect the material to be rolled before being rolled into the rolling roll. The feed speed of the material to be rolled is shifted to a low speed side, the impact load applied to the rolling roll when the material to be rolled is reduced, and the drive system of the rolling roll is protected. The feed rate of the rolled material is automatically adjusted by detecting that the rolled roll has been bitten by a load detector attached to the roll and shifting the feed rate of the rolled material to a higher speed side by the detector. Although control is described, deceleration is started at a certain position of the detector, so that the transport speed cannot respond to changes.If the transport speed is low, deceleration is too fast, resulting in reduced efficiency and Deceleration at high speed Too late, it had a problem that crowded engage in not completely deceleration.

Japanese Patent Publication No. 51-39182 discloses that in a reversible rolling mill, the releasing speed from the rolling mill is controlled by the flow rate of the material to be rolled and the acceleration / deceleration characteristics of the table for transferring the material to be rolled. Control, and then, when the same rolling mill reversely rotates and reversely feeds, the speed of the table related to the transfer of the material to be rolled is accelerated to a speed equal to or higher than the biting speed of the next rolling. By controlling the table speed so that the material to be rolled is bitten by reducing the speed to the feeding speed, the material to be rolled is re-engaged from the rolling mill until it is fed backward and bites into the rolling mill again. Although it is described that the time is shortened, the deceleration start point is determined based on the release speed and the maximum reverse rotation speed of the table, and there is a problem that a sufficient effect cannot always be obtained.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is intended to track a longitudinal end position of a material to be rolled and control a deceleration timing before biting and an acceleration timing after biting. Therefore, it is a first object to minimize a reduction in the rolling efficiency of the pass and to improve the quality such as the thickness accuracy at the end.

Another object of the present invention is to minimize the reduction in the rolling efficiency of the next pass and to improve the quality of the end portion such as the thickness accuracy.

[0011]

SUMMARY OF THE INVENTION According to the present invention, when rolling a material to be rolled, a biting end of the material to be rolled is detected by a detector, and a detection signal and a signal after passing through the detector are detected. Based on the transport speed of the rolled material, calculate the biting end position during transport, based on the information of the calculated biting end position, by controlling the transport speed until the material to be rolled bites into the rolling mill, This is a solution to the first problem.

The present invention is also directed to a method for rolling a rolled material by a reversible rolling mill, in which the measured distance from the rolling mill to the detector is determined at the time of the previous pass, and the measured distance between the detector and the detector at the time of the previous pass. By comparing with the calculated value of the bite end moving distance based on the transport speed of the rolled material until the end of the detector arrives,
Obtaining the correction information of the calculated value, at the time of the subsequent rolling pass, to detect the biting end of the material to be conveyed by the detector,
The biting end position during conveyance is calculated based on the detection signal and the conveying speed of the material to be rolled, and based on the information on the calculated biting end position corrected by the correction information, the material to be rolled into the rolling mill. The second problem has been solved by controlling the transport speed until the transfer.

Further, when the calculated biting end position passes a predetermined deceleration start position, the transport speed of the material to be rolled is reduced.

Further, the transport speed of the material to be rolled is obtained from the rotation speed of the rollers of the transport table.

According to the present invention, in a device for rolling a material to be rolled, a detector for detecting a biting end of the material to be rolled, means for detecting a conveying speed of the material to be rolled, Means for calculating a biting end position during conveyance based on the detection signal and a conveying speed of the material to be rolled after passing through the detector, and based on the information on the calculated biting end position, the material to be rolled is transmitted to the rolling mill. Means for controlling the transport speed until biting,
This is a solution to the first problem.

According to the present invention, there is also provided an apparatus for rolling a material to be rolled by a reversible rolling mill, a detector for detecting a biting end and a biting end of the material to be rolled, and a conveying speed of the material to be rolled. Means for detecting, at the time of biting of the previous pass, the actual measured distance from the rolling mill to the detector, and the transport speed of the rolled material from the biting of the rolling mill to the detector at the biting end from the biting end Means for creating and storing correction information for the calculated value by comparing the calculated value of the biting end moving distance based on the calculated value,
Means for calculating a biting end position during conveyance based on a detection signal of the detector for detecting a biting end of the material to be rolled and a conveying speed of the material to be rolled during the subsequent rolling pass; The second problem has been solved by providing a means for controlling the transport speed until the material to be rolled bites into the rolling mill based on the information on the calculated biting end position corrected by the information.

According to the present invention, after the material to be rolled out of the rolling mill, the longitudinal end position on the pull-out side is obtained by calculation or actual measurement, and then the material is transported until the material to be rolled into the rolling mill. The above-mentioned problems are solved by controlling the speed (for example, the deceleration timing of the transfer table and the deceleration rate biting speed), and controlling the acceleration timing, the acceleration rate, and the rolling speed of the rolling mill after biting. is there.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings.

Rolling mill 2 for implementing the rolling method according to the present invention
0, a steel sheet sensor 22 for detecting the biting end of the steel sheet 10 which is the material to be conveyed, as shown in FIG.
A pulse generator (PLG) 26 for detecting the rotation angle of the roller for detecting the conveyance speed of the steel plate 10 from the rotation speed of the roller of the conveyance table 24, for example, and the rolling speed is detected from the rotation speed of the rolling roll, for example. for,
A PLG 28 for detecting a rotation angle of a rolling roll (here, a backup roll).

The transport speed of the steel plate 10 is calculated based on the information of the PLG 26 that detects the rotation angle of the roller of the transport table 24, and the speed after the steel plate 10 has passed through the rolling mill 20 is integrated. The position of the biting end can be calculated. Further, the correction can be made by detecting the position of the end portion of the steel sheet using various sensors installed around the rolling mill.

Therefore, since the exact position of the end of the steel sheet on the side where the steel sheet bites into the rolling mill 20 can be known, the first embodiment of the present invention applied to the control of the rolling pass, as shown in FIG.
When the end of the steel plate reaches the deceleration start position set at a certain distance before being engaged with the rolling mill 20, the conveying table 24 starts decelerating, and after reaching the target engaging speed, the rolling table 20 is engaged. I can do it. Further, after being engaged with the rolling mill 20, it is possible to accelerate after reaching an acceleration start position set to a predetermined distance on the delivery side based on information of the PLG 28 which detects the rotation angle of the rolling roll.

Next, a second embodiment of the present invention in which the reversible rolling mill corrects the rolling pass control based on the information on the preceding pass will be described in detail with reference to FIG.

First, at the time of the previous pass biting shown in FIG. 3A, the end position is calculated by integrating the steel plate speed based on the biting timing and the steel plate speed information obtained by the PLG 26 thereafter. .

Next, as shown in FIG.
When the end of the sensor reaches the steel plate sensor 22, the movement distance of the end position obtained from the calculation is compared with the actually measured distance L of the sensor position, and correction information of the calculated value is obtained.

Next, as shown in FIG. 3 (C), before the path is engaged, the end position is calculated based on the re-passing timing of the steel sheet sensor 22 at the tip of the steel sheet 10 and the steel sheet speed information obtained by the PLG 26. The calculated value is corrected with the correction information obtained at the time of the previous pass biting.

Next, as shown in FIG. 3 (D), deceleration is started at the timing when the biting end (correction value) obtained by calculation reaches a preset deceleration start position.

In the above embodiment, the conveying speed and the rolling speed of the steel sheet are detected using PLG, but the method of detecting the conveying speed and the rolling speed is not limited to this.
It is also possible to use other detectors or to obtain them by calculation.

In the above embodiment, the present invention provides:
Although the present invention has been applied to plate rolling of a steel sheet, the application of the present invention is not limited to this.

[0029]

According to the present invention, the conveying speed is reduced immediately before biting into the rolling mill by tracking the position of the end of the material to be rolled on the rolling mill biting side, and the rolling speed is reduced at the target biting speed. It becomes possible to bite into a rolling mill, and it is also possible to accelerate after reaching a certain distance after biting into a rolling mill. Therefore, it is possible to improve the quality such as the thickness accuracy of the biting end while minimizing the reduction in the rolling efficiency.

[Brief description of the drawings]

FIG. 1 is a front view showing a basic configuration of a rolling mill to which the present invention is applied.

FIG. 2 is a diagram for explaining the operation of the first embodiment of the present invention applied to the control of the rolling pass;

FIG. 3 is a front view for explaining an operation of a second embodiment of the present invention for correcting the rolling pass control based on information on a previous pass.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Steel plate (rolled material) 20 ... Rolling machine 22 ... Steel plate sensor 24 ... Transport table 26,28 ... Pulse generator (PLG)

Claims (6)

[Claims] When rolling a material to be rolled, a biting end of the material to be rolled is detected by a detector, and based on a detection signal and a transport speed of the material to be rolled after passing through the detector. A rolling end method for calculating a biting end position during conveyance, and controlling a conveying speed until the material to be rolled bites into a rolling mill based on the information on the calculated biting end position. 2. When the material to be rolled is rolled by a reversible rolling mill, the actual distance measured from the rolling mill to the detector at the time of the biting of the preceding pass, and the detection of the biting end from the biting of the rolling mill at the time of biting. By comparing the calculated value of the moving distance of the biting end based on the transport speed of the rolled material up to the time when the rolled material arrives, correction information of the calculated value is obtained, and the workpiece to be transported in the subsequent rolling pass is obtained. The detector detects the biting end of the rolled material, calculates the biting end position during transport based on the detection signal and the transport speed of the material to be rolled, and calculates the calculated biting end position corrected by the correction information. A method of controlling a conveying speed until a material to be rolled is engaged in a rolling mill on the basis of the information of (1). 3. The rolling method according to claim 1, wherein when the calculated biting end position passes a predetermined deceleration start position, the conveying speed of the material to be rolled is reduced. 4. The rolling method according to claim 1, wherein the conveying speed of the material to be rolled is obtained from a rotation speed of a roller of a conveying table. 5. An apparatus for rolling a material to be rolled, a detector for detecting a biting end of the material to be rolled, a means for detecting a conveying speed of the material to be rolled, and a detection signal of the detector. Means for calculating a biting end position during conveyance based on the conveying speed of the material to be rolled after passing through the detector; and, based on the information on the calculated biting end position, until the material to be rolled bites into the rolling mill. Means for controlling the conveying speed of the rolling device. 6. An apparatus for rolling a material to be rolled by a reversible rolling mill, comprising: a detector for detecting a biting end and a biting end of the material to be rolled; and means for detecting a conveying speed of the material to be rolled. At the time of biting of the previous pass, the actual measured distance from the rolling mill to the detector, and the biting end based on the transport speed of the rolled material from the time of the biting of the rolling mill to the time of reaching the detector at the biting end. Means for creating and storing correction information for the calculated value by comparing the calculated value of the moving distance, and detection of the detector for detecting the biting end of the material to be rolled during the subsequent rolling pass Means for calculating a biting end position during conveyance based on the signal and the conveying speed of the material to be rolled; and a material to be rolled into the rolling mill based on the information on the calculated biting end position corrected by the correction information. Means for controlling the transport speed until the Rolling device that.