JP2021186860A - Conveying method for rolling material and rolling equipment - Google Patents

Abstract

To provide a conveying method for a rolling material, capable of accurately stopping a rolling material relative to a target stop position of the rolling material when the rolling material is rolled by reversible rolling equipment, and to provide rolling equipment that is able to realize such conveyance of a rolling material.SOLUTION: In reversible rolling equipment 1 capable of rolling in one direction and in a reverse direction as directions of conveyance of a rolling material, when a rolling material 10 is conveyed by table rollers 14, 16 arranged in front of and behind a rolling machine 12, a stop position of the rolling material 10 after rolling is estimated from a relation between kinetic energy of the rolling material 10 and drag of the table roller 14 or 16, which relation is obtained in advance, and the rolling material 10 is stopped based on the estimated stop position.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for transporting a rolled material and a rolling equipment when the rolled material is rolled by a reversible rolling equipment in a hot rolling mill.

In a reversible rolling facility called a reverse mill, a rough rolling mill (rolling machine) that roughly rolls the rolled material in each rolling process (hereinafter referred to as one pass) and tables before and after it. The rolled material is reciprocated by rotating the rollers in the forward and reverse directions, and the slab is thinned to a predetermined thickness by repeating rolling a plurality of times.

In such rolling equipment, a front edger for adjusting the width of the rolled material is provided on the front surface of the rough rolling mill, which is a reversible rolling mill, and a front table roller is provided in front of the front edger. Further, a rear surface edger for adjusting the width of the rolled material in the next pass is provided on the rear surface of the rough rolling mill, and a rear surface table roller is provided behind the rear surface edger. By controlling these front edgers and rear edgers with a control unit, the rolled material is conveyed.

In the first pass of rolling by such a reversible rolling equipment, the rolled material is rolled by a rough rolling mill and conveyed in the direction from the front table roller to the rear table roller. In the subsequent second pass, the direction of transport of the rolled material is opposite to that of the first pass, and the rolled material is conveyed in the direction from the rear table roller to the front table roller while being rolled by the rough rolling mill.

When the tail end of the rolled material passes through the rough rolling mill, deceleration starts from the speed at the time of rolling (top speed). The front table roller and the rear table roller have drive motors for all rolls, and rolling is performed by applying deceleration torque to the rolled material according to a predetermined deceleration rate while maintaining linear velocity by the drive motors. Stop the material. The predetermined deceleration rate is a deceleration rate at which the speed is reduced to zero from the top speed of the rear table roller or the front table roller at the time of reversal, and the rate takes a constant value. Therefore, the target stop position L (kickout position) can be calculated from the top speed and the deceleration rate.

That is, the deceleration time and the target stop position determined from the top speed and the deceleration rate are calculated in the control unit, and based on this, the rear table roller or the front table roller is operated at the time of reverse rotation.

In the reversible rolling equipment, in order to shorten the rolling time, as in Patent Document 1, the automatic position control (APC: Automatic) of the rough rolling mill (rolling machine) has been performed.
A method of accelerating the start timing of (Positioning Control) and a method of stopping the rolled material as close to the rough rolling mill as possible have been proposed.

Further, in Patent Document 2, the transfer pattern is divided into steps, and the timing of completing the setting change of the adjacent equipment such as the side guide and the edger is predicted at the timing when the rolled material leaves the rolling mill, and the rolled material is used as the rolling mill before the completion. A control method has been proposed in which the transfer (pull-in) is started and the rolling efficiency is improved.

However, in both Patent Document 1 and Patent Document 2, a constant value is given as a target stop position used for control, and improvement in accuracy of the target stop position itself is not mentioned.

Japanese Unexamined Patent Publication No. 01-202308 Japanese Unexamined Patent Publication No. 2013-1111615

Although it was possible to shorten the rolling time by the above method, there was a large error between the target stop position and the actual stop position. By repeating the reversible rolling a plurality of times, the error in the estimated transport time of the passing rolled material becomes larger, and improvement is required.

Due to the large variation in the actual stop position with respect to the target stop position of the rolled material, an error occurs in the estimated transport time of the rolled material passing through the rough rolling mill (rolling machine). Therefore, the total rolling time in the rough rolling mill becomes long, and the productivity decreases. In addition, the rolling equipment calculates the optimum time interval between the current rolled material and the next rolled material from the rolling time and transfer time of the currently rolled material (currently rolled material) and the next rolled material (next rolled material). However, it has a mill pacing function that calculates the extraction time of rolled material from the heating furnace, but due to the variation in the stop position of the rolled material, an error occurs in the extraction pitch of the mill pacing function, and extra extraction waiting or waiting There is a problem that pitch cannot be increased due to material retention due to pitch calculation that is too early.

Therefore, the present invention is a method for conveying a rolled material capable of accurately stopping the rolled material with respect to a target stop position of the rolled material when rolling the rolled material by a reversible rolling facility, and such rolling. It is an object of the present invention to provide rolling equipment capable of transporting materials.

In order to solve the above problems, the present invention provides the following means [1] to [18].

[1] A method for transporting rolled material by using table rollers arranged in front of and behind the rolling mill in a reversible rolling equipment capable of rolling in one direction and in the opposite direction. hand,
Rolling is characterized in that the stop position of the rolled material after rolling is predicted from the relationship between the kinetic energy of the rolled material obtained in advance and the drag force of the table roller, and the rolled material is stopped based on the predicted stop position. How to transport the material.

[2] When the rolled material is stopped in rolling with the rolling equipment, the rolled material is conveyed by a drive motor of a table roller arranged on the downstream side with respect to the conveying direction of the rolled material, and the rolled material is conveyed at the stop position. The method for transporting a rolled material according to [1], which comprises stopping at.

[3] The actual value of the stop position of the rolled material after rolling in the rolling with the rolling equipment is based on the kinetic energy of the rolled material and the length and rolling width of the rolled material used for calculating the drag force of the table roller. The method for transporting rolled material according to [1] or [2], wherein the rolling material is arranged according to the parameter P and the stop position of the rolled material after rolling is predicted from the value of the parameter P.

[4] The parameter P is
The following equation (1), which shows the relationship between the kinetic energy U of the rolled material, the rolling speed (including the top speed and the advanced rate) v of the rolling mill, and the weight m of the rolled material,
The following equation (2) derived from the relationship of forces when the drag force F of the rear table roller is set to time t,
The drag force F is expressed by the length l of the rolled material, the rolling width W of the rolled material, and the drag force f per the width of one roll, and is based on the following equation (3) reflecting the roll pitch of the table roller of 800 mm. It is defined by the following equation (4),
Since the stop position L correlates with the time t until the rolled material stops, the stop position is predicted from the parameter P based on the correlation between the actual value of the stop position L shown in the following equation (5) and the parameter P. The method for transporting a rolled material according to [3].

[5] From the stop position L'obtained as a predicted value, the time T from the timing at which the tail end of the rolled material passes through the rolling mill to the stop is calculated by the following equation (6). The method for transporting a rolled material according to [3] or [4].

[6] The method for conveying a rolled material according to [5], wherein the time T is reflected in the mill pacing calculation.

[7] When the rolled material is transported from the stopped state to the rolling mill in rolling with the rolling equipment, the drive motor of the table roller arranged upstream from the stop position in the transport direction of the rolled material. The method for transporting a rolled material according to any one of [3] to [6], which comprises transporting the rolled material.

[8] The method for transporting a rolled material according to [7], wherein the time T'from the stop position L'to the rolled material to reach the rolling mill is calculated and predicted by the following equation (7).

[9] The method for conveying a rolled material according to [8], wherein the time T'is reflected in the mill pacing calculation.

[10] A reversible rolling equipment capable of rolling in one direction and a reverse direction in which the rolled material is conveyed.
It has a rolling mill that rolls the rolled material, a table roller that conveys the rolled material arranged before and after the rolling mill, and a control unit that controls the driving of the rolling mill and the table roller.
The control unit predicts the stop position of the rolled material after rolling from the relationship between the kinetic energy of the rolled material obtained in advance and the drag force of the table roller, and stops the rolled material based on the predicted stop position. Rolling equipment featuring.

[11] The table roller has a plurality of rolls and a drive motor for driving the rolls, and the control unit is on the downstream side with respect to the transport direction of the rolled material when the rolled material is stopped in rolling. The rolling equipment according to [10], wherein the drive motor of the table roller arranged in the above is driven to convey the rolled material and to stop the rolled material at the stop position.

[12] The control unit uses the actual value of the stop position of the rolled material after rolling in rolling with the rolling equipment, the kinetic energy of the rolled material, the length of the rolled material used for calculating the drag of the table roller, and the length of the rolled material. The rolling equipment according to [10] or [11], which is arranged by a parameter P based on the rolling width and predicts the stop position of the rolled material after rolling from the value of the parameter P.

[13] The parameter P is
The following equation (1), which shows the relationship between the kinetic energy U of the rolled material, the rolling speed (including the top speed and the advanced rate) v of the rolling mill, and the weight m of the rolled material,
The following equation (2) derived from the relationship of forces when the drag force F of the rear table roller is set to time t,
The drag force F is expressed by the length l of the rolled material, the rolling width W of the rolled material, and the drag force f per the width of one roll, and is based on the following equation (3) reflecting the roll pitch of the table roller of 800 mm. It is defined by the following equation (4),
The control unit
Since the stop position L correlates with the time t until the material stops, the stop position is predicted from the parameter P based on the correlation between the actual value of the stop position L shown in the following equation (5) and the parameter P. The rolling equipment according to [12].

[14] The control unit calculates the time T from the stop position L'obtained as a predicted value from the timing at which the tail end of the rolled material passes through the rolling mill to the stop by the following equation (6). The rolling equipment according to [12] or [13].

[15] The rolling equipment according to [14], wherein the control unit reflects the time T in the mill pacing calculation.

[16] The table roller has a plurality of rolls and a drive motor for driving the rolls, and the control unit transfers the rolled material from a stopped state to the rolling mill in rolling with the rolling equipment. [12] to [15], wherein the drive motor of the table roller arranged on the upstream side with respect to the transport direction of the rolled material is driven to transport the rolled material from the stop position. Rolling equipment.

[17] The rolling according to [16], wherein the control unit calculates and predicts the time T'when the rolled material reaches the rolling mill from the stop position L'by the following equation (7). Facility.

[18] The rolling equipment according to [17], wherein the control unit reflects the time T'in the mill pacing calculation.

According to the present invention, the stop position of the rolled material can be predicted with high accuracy by considering the kinetic energy (inertial force) of the rolled material and the drag force of the table roller. When rolling the material, the rolled material can be stopped accurately with respect to the target stop position of the rolled material. As a result, the total rolling time in the rough rolling mill is shortened, so that the productivity is improved. In addition, since the temperature drop in rough rolling is small, the plate-passing stability during biting in rough rolling and finish rolling is ensured. Further, the extraction pitch of the mill pacing function of the control unit that controls the rolling equipment can be made highly accurate.

It is a side view which shows typically the reversible type rolling equipment for carrying out the transfer method of the rolled material which concerns on one Embodiment of this invention. It is a figure for demonstrating the state which carries out the transfer method of the rolled material which concerns on one Embodiment by the reversible type rolling equipment. It is explanatory drawing explaining the difference between the deceleration rate at the time of stopping a rolling material by a table roller and the deceleration rate of a rolled material, and the target stop position and the actual stop position with it in a reversible rolling equipment. It is explanatory drawing explaining that the acceleration rate of a rolled material by a table roller, the calculation of the transfer time associated with it, and the difference in the actual result occur in the reversible rolling equipment. It is a figure which shows the correlation between the parameter P in an Example, and the stop position actual Lreal. It is a figure which shows the correlation of the difference between the actual transfer time per pass, and the calculation in a conventional parameter P and a reversible rolling equipment. It is a figure which shows the correlation between the parameter P in an embodiment, the actual transfer time per pass in a reversible rolling equipment, and the difference in calculation. It is a figure which shows the difference between the actual and the calculation of the transport time per pass at the stop position L calculated by the conventional method. It is a figure which shows the difference between the actual and the calculation of the transport time per pass reflecting the stop position L calculated by the method of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a side view schematically showing a reversible rolling equipment for carrying out a method of transporting a rolled material according to an embodiment of the present invention, and FIG. 2 is a side view schematically showing a reversible rolling equipment according to an embodiment. It is a figure for demonstrating the state which carries out the transport method of a rolled material.

As shown in FIG. 1, the reversible rolling equipment 1 is provided with a rough rolling mill 12 which is a reversible rolling machine that roughly rolls a rolled material 10, and a reversible rolling mill 12 provided on the front surface of the rough rolling mill. A front edger 13 for adjusting the width, a front table roller 14 arranged in front of the front edger 13, and a rear edger 15 provided on the rear surface of the rough rolling mill and adjusting the width of the rolled material 10 in the next pass. It has a rear table roller 16 arranged behind the rough rolling mill 12 and a control unit 70. Both the front table roller 14 and the rear table roller 16 have a plurality of rolls and a plurality of drive motors for driving the respective rolls. The control unit 70 controls the rough rolling mill 12, the front edger 13, the rear edger 15, the front table roller 14, and the rear table roller 16.

The reversible rolling equipment can roll the rolled material in one direction and the opposite direction, and the front table roller 14 and the rear table roller 16 transfer the rolled material 10 under the control of the control unit 70. It is configured. As described above, the rolls of the front table roller 14 and the rear table roller 16 are individually driven by a drive motor, and the control unit 70 each maintains a predetermined deceleration while maintaining linear speed. According to the rate, the drive motor of the front table roller 14 or the rear table roller 16 is controlled so as to apply the deceleration torque to the rolled material 10 to stop the rolled material 10. Here, when the rolled material 10 is stopped, the rolled material 10 is conveyed by the drive motor of the table roller arranged on the downstream side in the conveying direction of the rolled material, and is stopped at the stop position. That is, when transporting in one direction, the drive motor of the rear table roller 16 is driven, and when transporting in the opposite direction, the drive motor of the front table roller 14 is driven. Further, the predetermined deceleration rate is set to zero from the top speed of the rear table roller 16 during normal rotation (during transport in one direction) or the top speed of the front table roller 14 during reverse rotation (during transport in the reverse direction). It is a deceleration rate, and the rate takes a constant value. Therefore, the target stop position L (kickout position) can be calculated from the top speed and the deceleration rate.

In the present embodiment, the control unit 70 is further conveyed by the rear table roller 16 or the front table roller 14 at the time of reversal so that the rolled material can be stopped accurately with respect to the target stop position of the rolled material. The stop position L of the rolled material 10 is predicted by considering the kinetic energy (inertial force) of the rolled material 10. More specifically, the rolling stop position L is predicted from the relationship between the kinetic energy of the rolled material 10 obtained in advance and the drag force F of the rear table roller 16 (front table roller 14 at the time of reversal), and the rolled material is stopped based on this. Let me.

In the reversible rolling equipment 1 configured as described above, the rolled material 10 is rotated in one direction and in the reverse direction by rotating the rough rolling mill 12 and the table rollers 14 or 16 before and after the rough rolling mill 12 in the forward and reverse directions for each pass. The slab is thinned to a predetermined thickness by repeating rolling a plurality of times.

In the first pass of rolling by the rolling equipment 1, as shown in FIG. 2A, the rolled material 10 is conveyed in the direction from the front table roller 14 toward the rear table roller 16 while being rolled by the rough rolling mill 12. .. In the subsequent second pass, the direction of transport of the rolled material 10 is opposite to that of the first pass, and the rolled material 10 is conveyed in the direction from the rear table roller 16 to the front table roller 14 while being rolled by the rough rolling mill 12. Will be done.

When the tail end of the rolled material 10 passes through the rough rolling mill 12, deceleration starts from the speed at the time of rolling (top speed) and is stopped. The control unit 70 applies a deceleration torque to the rolled material 10 according to a predetermined deceleration rate while maintaining linear velocity by the drive motors of the rolls of the front table roller 14 or the rear table roller 16, respectively, so that the rolled material 10 is used. To stop.

As shown in FIG. 2B, after the rolling of the current rolled material 10 is completed, the rolling of the next rolled material 11 is started. At this time, the control unit 70 has a mill pacing function, and calculates the optimum time interval between the rolled material 10 and the rolled material 11 from the rolling time and the conveying time of the current rolled material 10 and the next rolled material 11. However, the extraction time of the rolled material from the heating furnace is calculated and optimized.

However, conventionally, there is a large error between the target stop position of the rolled material 10 and the actual stop position, which causes inconvenience. The reason why the difference between the target stop position and the actual stop position is as shown in FIGS. 3 and 4. That is, as shown in FIG. 3, immediately after the rolled material 10 has passed through the rough rolling mill 12, the control unit 70 controls the drive motor to decelerate the roll at a predetermined deceleration rate (deceleration rate α), and the rear surface. The table roller 16 is stopped to stop the rolled material 10, but in reality, there is a time lag between the time when the rear table roller 16 is stopped and the time when the rolled material 10 is stopped, so the stop position of the rolled material 10 is the target stop position. It deviates from. Further, as shown in FIG. 4, after the rolled material 10 is accelerated and the rolling biting speed is reached, the time required to reach the rough rolling mill 12 also has an error between the calculated value and the actual value, and the rolled material 10 has an error. An error occurs in the stop position of the rough rolling mill 12.

Specifically, conventionally, as shown in FIG. 5 described later, the control is performed with the target stop position of 4100 mm, but the actual stop position Lreal has a large error from the target stop position. By repeating the reversible rolling a plurality of times, the error in the estimated transport time of the passing rolled material becomes larger, and improvement is required. FIG. 6 is a diagram showing the difference between the actual transfer time per pass and the calculation in the rolling equipment 1, but it can be seen that the stop position differs depending on the parameter P described later, and the error in the transfer time tends to increase. ..

As described above, conventionally, due to the large variation in the actual stop position of the rolled material 10 with respect to the target stop position, an error occurs in the estimated time for transporting the rolled material passing through the rough rolling mill (rolling machine) 12. Therefore, the optimum time interval between the rolled material 10 and the rolled material 11 is calculated from the rolling time and transport time of the current rolled material 10 and the next rolled material 11, and the extraction time of the rolled material from the heating furnace is calculated. An error occurs in the extraction pitch of the mill pacing function, which causes problems such as waiting for extra extraction and material retention due to premature pitch calculation, which makes it impossible to increase the pitch.

Conventionally, if the top speed is constant for any rolled material, the target stop position is the same target value, and the rolled material 10 is a rough rolling mill for the rear table roller 16 or the front table roller 14 at the time of reversal. The deceleration was started from the top speed at a predetermined deceleration rate from the timing of passing through.

However, such a control method is ideal not considering the inertial force of the material (rolled material) but only the deceleration rate of the rear table roller 16 (front table roller 14 at the time of reversal) that conveys the rolled material 10. As shown in Fig. 6, the actual stop position actually flows in the direction away from the rough rolling mill (rolling machine) 12 side than the target position, and the rolling time prediction has an error on the longer side. Turned out to have.

Therefore, in order to predict the stop position L of the rolled material 10 in the reversible rolling equipment 1 with high accuracy, the present inventors use an ITV in which the actual stop position Lreal of the rolled material 10 is installed on the rolling equipment 1. The measurement was performed and the correlation analysis between the actual stop position Lreal and the operation data was performed. As a result, by considering the rolling speed (including top speed and advanced rate) v, the kinetic energy (inertial force) obtained from the weight m of the rolled material, and the drag force F of the rear table roller 16 (front table roller 14 at the time of reversal). It has been found that the stop position L of the rolled material 10 can be predicted with high accuracy.

That is, in the present embodiment, it is possible to predict the stop position L of the rolled material 10 by considering the kinetic energy (inertial force) of the rolled material 10 conveyed by the rear table roller 16 or the front table roller 14 at the time of reversal. do.

For example, the rolling equipment 1 uses a parameter P based on the kinetic energy of the rolled material 10 and the length l of the rolled material and the rolling width W used to calculate the resistance F of the rear table roller 16 (front table roller 14 at the time of reversal). The actual value of the stop position of the rolled material 10 after rolling in the rough mill rolling is arranged by the parameter P, and the stop position of the rolled material after rolling is predicted from the value of the parameter P.

The parameter P will be described in detail below.
The kinetic energy U of the rolled material is obtained from the rolling speed (including top speed and advanced rate) v of the rough rolling mill 12 in the reversible rolling equipment 1 and the weight m of the rolled material as shown in the following equation (1). Assuming that the drag force F of the rear table roller 16 is time t, the equation (2) is derived from the relationship of the forces. Further, the drag force F of the rear table roller 16 on the downstream side in the rolling direction as in the equation (3) is obtained from the length l of the rolled material, the rolling width W of the rolled material, and the drag force f per the width of one roll. The formula (3) reflects the roll pitch of the rear table roller 16 of 800 mm.

パラメーターＰは事前に予測可能な数値にて構成されているため、制御部７０において、パラメーターＰから停止位置を予測することが可能となる。 Based on the above (1) to (3), the parameter P is defined as the following equation (4). Then, since the stop position (kickout position) L correlates with the time t until the material stops, the correlation between the actual value (Lreal) of the stop position L and the parameter P should be explained as in Eq. (5). Can be done.

Since the parameter P is composed of numerical values that can be predicted in advance, the control unit 70 can predict the stop position from the parameter P.

FIG. 5 is a diagram showing the correlation between the actual stop position Lreal and the parameter P defined below. ^{As shown in this figure, there is a very significant correlation (R 2} = 0.84) between the actual stop position Lreal and the parameter P, and by obtaining the parameter P, the stop position of the rolled material can be determined with high accuracy. You can see that it can be predicted with.

As described above, according to the present embodiment, the kinetic energy U (inertial force) of the rolled material and the drag force F of the rear table roller 16 (the front table roller 14 at the time of reversal) for transporting the rolled material 10 are taken into consideration, for example. By obtaining the parameter P, the stop position of the rolled material 10 can be predicted with high accuracy. Therefore, when the rolled material is rolled by the reversible rolling equipment, the stop position of the rolled material 10 can be accurately predicted with respect to the target stop position of the rolled material. The rolled material can be stopped. Therefore, the total rolling time in the rough rolling mill can be shortened, and the productivity can be improved. Further, since the temperature drop in rough rolling is reduced by shortening the time for rough rolling, it is possible to ensure the plate-passing stability during biting in rough rolling and finish rolling.

この時間Ｔを制御部７０でのミルペーシング計算へ反映する。 Since the stop position L'is obtained as a predicted value, the control unit 70 sets the time T from the timing at which the tail end of the rolled material 10 passes through the rough rolling mill (rolling machine) 12 to the stop at the following (6). ) Can be calculated.

This time T is reflected in the milpacing calculation in the control unit 70.

この時間Ｔ’を制御部７０でのミルペーシング計算へ反映させる。 Further, when the rolled material 10 is transferred from the stopped state to the rough rolling mill (rolling machine) 12 in the rough mill rolling in the rolling equipment 1, the actual stop position (kickout position) L is directed to the transfer direction of the rolled material 10. It is conveyed by the drive motor of the table roller (front table roller 14 or rear table roller 16) arranged on the upstream side. At that time, the control unit 70 is calculated by the following equation (7) using the stop position L'as the predicted value described above for the time T'when the rolled material 10 reaches the rough rolling mill (rolling machine) 12 from the stop position L. It can be calculated and predicted at. In equation (7), v'is the rolling biting speed.

This time T'is reflected in the milpacing calculation in the control unit 70.

FIG. 7 is a diagram showing the difference between the actual and calculated transfer times per pass in the reversible rolling equipment reflecting the stop position L calculated in the present embodiment. It can be seen that the error in the transport time is greatly reduced by using the parameter P.

In this way, since the time T and the time T'can be predicted from the stop position of the rolled material 10, the control unit 70 can calculate a highly accurate transfer prediction and determine it before extraction from the heating furnace. It is also possible to reflect it in the mill pacing function that calculates the time interval between the rolled material and the next rolled material and calculates the extraction time of the rolled material from the heating furnace. Therefore, the accuracy of the extraction pitch of the mill pacing function can be improved.

Although the embodiments of the present invention have been described above, these are merely examples and should be considered not to be restrictive. The above embodiments may be omitted, replaced or modified in various embodiments without departing from the gist of the present invention.

Hereinafter, examples will be described.
Here, mainly low-carbon steel, medium-carbon steel, high-tensile steel, and special materials were rolled using the reversible rolling equipment shown in FIG. 1, and data of N = 113 were obtained. The number of reverses of the rough rolling mill was set to 5 passes and 7 passes, which are the mainstream. The unit weight range includes from 7 ton to 35 ton and the top speed includes from 140 mpm to 230 mmp. FIG. 5 is a diagram showing the correlation between the parameter P of the data of N = 113 and the stop position actual Lreal. Conventionally, there was a large error in the stop position actual Lreal with respect to the target stop position 4100 mm, but in this embodiment, by defining the parameter P as shown in FIG. 5, between the parameter P and the stop position actual Lreal. Has a very strong correlation of R ² = 0.84, and it was confirmed that the stop position L can be predicted with high accuracy using the parameter P.

Next, the difference between the actual transport time per pass and the calculation was compared between the conventional method and the embodiment of the present invention. FIG. 8 is a diagram showing the difference between the actual transport time per pass and the calculation at the stop position L calculated by the conventional method, and FIG. 9 reflects the stop position L calculated by the method of the present invention. It is a figure which shows the difference between the actual and the calculation of the transport time per pass.

If the actual result is larger than the calculation, the rolled material stays in front of the rough rolling mill before rolling, and the rolling sheet flowability becomes unstable due to the decrease in the temperature of the rolled material. It is necessary to correct the calculated value so that the maximum error of is greater than zero (to avoid stagnation), and the rolling efficiency is reduced. That is, the smaller the value of the maximum error (actual-calculation) between the actual transfer time and the calculated value, the higher the rolling efficiency. In the conventional method, the maximum error of the transport time is 5 sec as shown in FIG. 8, whereas in the method of the present invention, the maximum error is 3 sec as shown in FIG. 9, and ▽ 2 sec / pass is the effect of improving the rolling efficiency. ..

The reversible rolling equipment machine uses 5 passes and 7 passes, which are the mainstream as the number of reverses, and the ratio of the rough rolling mill becoming the bottleneck of the entire process is 20%, so rolling of 5 pass materials and 7 pass materials. The efficiency improvement effect is calculated as follows.
5 pass material: ▽ 2 sec x 4 pass ≒ △ 7 T / H × 18% = △ 1.3 T / H
7-pass material: ▽ 2sec x 6-pass ≒ △ 50T / H × 3% = △ 1.5T / H
That is, it was confirmed that the total of the 5-pass material and the 7-pass material had an effect of improving the rolling efficiency of Δ2.8 T / H.

1 Rolling equipment 10, 11 Rolled material 12 Rough rolling mill 13 Front edger 14 Front table roller 15 Rear edger 16 Rear table roller 70 Control unit

Claims (18)

A method for transporting rolled material by using table rollers arranged in front of and behind the rolling mill in a reversible rolling equipment capable of rolling in one direction and in the opposite direction.
Rolling is characterized in that the stop position of the rolled material after rolling is predicted from the relationship between the kinetic energy of the rolled material obtained in advance and the drag force of the table roller, and the rolled material is stopped based on the predicted stop position. How to transport the material. When the rolled material is stopped in rolling with the rolling equipment, the rolled material is conveyed by the drive motor of the table roller arranged on the downstream side with respect to the conveying direction of the rolled material, and the rolled material is stopped at the stopped position. The method for transporting a rolled material according to claim 1, wherein the rolled material is conveyed. The actual value of the stop position of the rolled material after rolling in the rolling with the rolling equipment is set to the parameter P based on the kinetic energy of the rolled material and the length and rolling width of the rolled material used for calculating the drag force of the table roller. The method for transporting a rolled material according to claim 1 or 2, wherein the stop position of the rolled material after rolling is predicted from the value of the parameter P. The parameter P is
The following equation (1), which shows the relationship between the kinetic energy U of the rolled material, the rolling speed (including the top speed and the advanced rate) v of the rolling mill, and the weight m of the rolled material,
The following equation (2) derived from the relationship of forces when the drag force F of the rear table roller is set to time t,
The drag force F is expressed by the length l of the rolled material, the rolling width W of the rolled material, and the drag force f per the width of one roll, and is based on the following equation (3) reflecting the roll pitch of the table roller of 800 mm. It is defined by the following equation (4),
Since the stop position L correlates with the time t until the rolled material stops, the stop position is predicted from the parameter P based on the correlation between the actual value of the stop position L shown in the following equation (5) and the parameter P. The method for transporting a rolled material according to claim 3, wherein the rolled material is conveyed.

3. The third aspect of the present invention is to calculate the time T from the stop position L'obtained as a predicted value from the timing at which the tail end of the rolled material passes through the rolling mill to the stop by the following equation (6). Alternatively, the method for transporting a rolled material according to claim 4.

The method for transporting a rolled material according to claim 5, wherein the time T is reflected in the milpacing calculation. When the rolled material is conveyed from the stopped state to the rolling mill in rolling with the rolling equipment, it is conveyed by the drive motor of the table roller arranged upstream from the stop position in the conveying direction of the rolled material. The method for transporting a rolled material according to any one of claims 3 to 6, wherein the rolled material is conveyed. The method for transporting a rolled material according to claim 7, wherein the time T'from the stop position L'to the rolled material to reach the rolling mill is calculated and predicted by the following equation (7).

The method for transporting a rolled material according to claim 8, wherein the time T'is reflected in the milpacing calculation. It is a reversible rolling equipment that can roll the rolled material in one direction and the opposite direction.
It has a rolling mill that rolls the rolled material, a table roller that conveys the rolled material arranged before and after the rolling mill, and a control unit that controls the driving of the rolling mill and the table roller.
The control unit predicts the stop position of the rolled material after rolling from the relationship between the kinetic energy of the rolled material obtained in advance and the drag force of the table roller, and stops the rolled material based on the predicted stop position. Rolling equipment featuring. The table roller has a plurality of rolls and a drive motor for driving the rolls, and the control unit is arranged on the downstream side with respect to the transport direction of the rolled material when the rolled material is stopped in rolling. The rolling equipment according to claim 10, wherein the driving motor of the table roller is driven to convey the rolled material and to stop the rolled material at the stop position. The control unit determines the actual value of the stop position of the rolled material after rolling in the rolling with the rolling equipment, the kinetic energy of the rolled material, the length of the rolled material and the rolling width used for calculating the resistance of the table roller. The rolling equipment according to claim 10 or 11, characterized in that the stop position of the rolled material after rolling is predicted from the value of the parameter P, which is arranged according to the parameter P based on the above. The parameter P is
The following equation (1), which shows the relationship between the kinetic energy U of the rolled material, the rolling speed (including the top speed and the advanced rate) v of the rolling mill, and the weight m of the rolled material,
The following equation (2) derived from the relationship of forces when the drag force F of the rear table roller is set to time t,
The drag force F is expressed by the length l of the rolled material, the rolling width W of the rolled material, and the drag force f per the width of one roll, and is based on the following equation (3) reflecting the roll pitch of the table roller of 800 mm. It is defined by the following equation (4),
The control unit
Since the stop position L correlates with the time t until the material stops, the stop position is predicted from the parameter P based on the correlation between the actual value of the stop position L shown in the following equation (5) and the parameter P. The rolling equipment according to claim 12, wherein the rolling equipment is characterized by the above.

The control unit calculates and predicts the time T from the stop position L'obtained as the predicted value from the timing at which the tail end of the rolled material passes through the rolling mill to the stop by the following equation (6). The rolling equipment according to claim 12 or 13.

The rolling equipment according to claim 14, wherein the control unit reflects the time T in the mill pacing calculation. The table roller has a plurality of rolls and a drive motor for driving the rolls, and the control unit stops when the rolled material is transferred from the stopped state to the rolling mill in rolling with the rolling equipment. The rolling according to any one of claims 12 to 15, wherein the drive motor of the table roller arranged on the upstream side with respect to the transport direction of the rolled material is driven to transport the rolled material from the position. Facility. The rolling equipment according to claim 16, wherein the control unit calculates and predicts the time T'when the rolled material reaches the rolling mill from the stop position L'by the following equation (7).

The rolling equipment according to claim 17, wherein the control unit reflects the time T'in the mill pacing calculation.

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