JP5929545B2 - Reverse rolling apparatus and reverse rolling method - Google Patents

Description

  The present invention relates to a reverse rolling apparatus and reverse rolling that perform rolling a plurality of times on a material to be rolled by reciprocating the material to be rolled between a pair of rolling rolls in a production line for steel plates such as thick plates. Regarding the method.

At steelworks, etc., in the production line for steel plates such as thick plates, a reverse type rolling device that repeats normal rotation and reverse rotation (hereinafter sometimes referred to as “reverse rolling device”) is used to achieve a desired plate thickness. A rolled steel sheet may be formed.
In recent years, the demand for thick plates has been strong, and it is expected that the plan will continue to be steady in the future. Therefore, improving the production efficiency of thick plates is being promoted at each factory (steel works). As a technique for improving the manufacturing efficiency of the thick plate, for example, there is a technique disclosed in Patent Document 1.

  The technique disclosed in Patent Document 1 is a method of controlling the speed of a table that allows a material to be rolled to be caught between a pair of rolling rolls provided in a reverse rolling apparatus, and in a state where the material to be rolled is being rolled. Control the speed to the rolling roll speed. On the other hand, from the time when the tail end of the material to be rolled is bitten between the pair of rolling rolls until the predetermined elapsed time set in advance is maintained at the speed of the rolling roll at the time of biting, the predetermined progress In this technique, after the time has elapsed, the vehicle is decelerated according to a predetermined acceleration / deceleration rate set in advance and then stopped for a predetermined stop time set in advance.

Japanese Patent Publication No. 63-61084

However, in the conventional technique including the technique disclosed in Patent Document 1 described above, the biting speed of the material to be rolled between the rolling rolls is set to a fixed value (constant value) smaller than the maximum value of the rolling speed of the steady portion. Value).
Therefore, with respect to the material to be rolled bitten between the rolling rolls, there are a plurality of stop positions for stopping the material to be rolled, such as a position for measuring the temperature and a position for measuring the plate thickness. However, the biting speed for each stop position is not set individually.

Therefore, among the stop positions set at a plurality of locations, when the transport distance is long from the rolling roll until the material to be bitten between the rolling rolls is stopped, the transport time of the material to be rolled becomes long. There is a risk that the production efficiency of the steel sheet is reduced.
The present invention has been made paying attention to the problems as described above, and even when a plurality of stop positions for stopping the material to be rolled are set, the material to be rolled bitten from between the rolling rolls. It is an object of the present invention to provide a reverse rolling apparatus and a reverse rolling method capable of shortening the conveyance time until the material stops.

In order to solve the above-mentioned problems, the invention described in claim 1 of the present invention is a reverse rolling apparatus that performs rolling a plurality of times by reciprocating a material to be rolled between a pair of rolling rolls. ,
A rolling roll rotating mechanism for rotating the rolling roll;
A rolling roll rotating mechanism control unit for controlling a driving state of the rolling roll rotating mechanism;
A conveying roll for conveying the material to be rolled bitten from between the pair of rolling rolls to a plurality of preset stop positions;
A transport roll rotating mechanism for rotating the transport roll,
The rolling roll rotation mechanism control unit, said pair of rolling elapsed time T _out of the material to be rolled which is rolled between rolls to be stopped at the stop position of the plurality of positions and release bite from between the pair of rolling rolls [Sec], and a plurality of types of material stop distances that are distances from the pair of rolling rolls to the stop positions at the plurality of locations are L _out [mm], and the peripheral speed of the transport roll rotated by the transport roll rotating mechanism The acceleration is α [mm / s ² ], and the peripheral speed of the work roll constituting the rolling roll at the time when the material being rolled between the pair of rolling rolls is released from between the pair of rolling rolls. some chewing release rate when the _V out [mm / s], in response to said plurality of types of materials stop distance _L out [mm], the chewing release velocity _V out a [mm / s], following The elapsed time T _out is calculated by the equation _[sec] is characterized in that the set to be shortest.

According to the present invention, the rolling roll rotating mechanism controller controls the biting speed V _out [in accordance with the fixed value of the material stop distance L _out [mm] and the peripheral speed acceleration α [mm / s ² ] of the transport roll. mm / s] is set so that the elapsed time T _out [sec] calculated by the above equation is the shortest.
For this reason, a plurality of stop positions for stopping the rolled material after rolling are set, and a plurality of material stop distances L _out [mm] are set according to the stop positions at the plurality of places. However, according to the plurality of material stop distances L _out [mm], the biting speed V _out [mm / s] can be set so that the elapsed time T _out [sec] is the shortest. Become.

Next, of the present invention, the invention described in claim 2 is an invention dependent on claim 1, wherein the rolling roll rotating mechanism control unit sets the biting speed V _out [mm / s], The upper limit value V _out-max [mm / s] of the rolling speed at which the material to be rolled can be released is set.
According to the present invention, the rolling roll rotating mechanism control unit sets the biting speed V _out [mm / s] to the upper limit value V _out-max [mm / s] of the rolling speed at which the material to be rolled can be bitten. .
For this reason, the higher the biting speed _Vout [mm / s], the faster the speed at which the peripheral speed of the transport roll is decelerated from the biting speed _Vout [mm / s] in order to stop the rolled material after rolling. Can be the fastest point based on the performance of the transport roll.

Next, of the present invention, the invention described in claim 3 is a reverse rolling method in which a material to be rolled is reciprocated between a pair of rolling rolls and rolled a plurality of times.
A rolling roll rotation mechanism control step for controlling a driving state of a rolling roll rotation mechanism for rotating the rolling roll;
In the rolling roll rotating mechanism control step, an elapsed time until the material being rolled between the pair of rolling rolls is bitten from between the pair of rolling rolls and stopped at a plurality of preset stop positions. T _out [sec], and a plurality of types of material stop distances, which are distances from the pair of rolling rolls to the stop positions at the plurality of places, are L _out [mm], and are bitten from between the pair of rolling rolls. The acceleration of the peripheral speed of the conveyance roll which conveys a to-be-rolled material to the said several stop position is set to (alpha) [mm / s < ² >], The said to-be-rolled material currently rolled between the said pair of rolling rolls is a pair of rolling rolls when the chewing release rate is a peripheral speed of the work rolls which constitute the rolling rolls at the time of releasing chewing was V _{out [mm} / s] from between the plurality of types of materials stop distance L _ou Depending on the [mm], the chewing release velocity _V out [mm / s], in which the elapsed time _T out [sec] is calculated by the following equation and sets so that the shortest is there.

According to the present invention, in the rolling roll rotating mechanism control step, the biting speed V _out [V _out [in accordance with the fixed material stop distance L _out [mm] and the peripheral speed acceleration α [mm / s ² ] of the transport roll. mm / s] is set so that the above equation is satisfied and the elapsed time T _out [sec] is the shortest.
For this reason, a plurality of stop positions for stopping the rolled material after rolling are set, and a plurality of material stop distances L _out [mm] are set according to the stop positions at the plurality of places. However, according to the plurality of material stop distances L _out [mm], the biting speed V _out [mm / s] can be set so that the elapsed time T _out [sec] is the shortest. Become.

Next, among the present inventions, the invention described in claim 4 is an invention dependent on claim 3, wherein in the rolling roll rotating mechanism control step, the biting speed V _out [mm / s] is set as follows: The upper limit value V _out-max [mm / s] of the rolling speed at which the material to be rolled can be released is set.
According to the present invention, in the rolling roll rotating mechanism control step, the biting speed V _out [mm / s] is set to the upper limit value V _out-max [mm / s] of the rolling speed at which the material to be rolled can be bitten. .
For this reason, the higher the biting speed _Vout [mm / s], the faster the speed at which the peripheral speed of the transport roll is decelerated from the biting speed _Vout [mm / s] in order to stop the rolled material after rolling. Can be the fastest point based on the performance of the transport roll.

According to the present invention, a plurality of stop positions for stopping the material to be rolled after rolling are set, and a plurality of material stop distances L _out [mm] are set according to the stop positions at the plurality of places. Even so, according to a plurality of material stop distances L _out [mm], the biting speed V _out [mm / s] is set so that the elapsed time T _out [sec] is the shortest. Is possible.
Accordingly, even when a plurality of stop positions for stopping the material to be rolled are set, it is possible to shorten the conveyance time until the material to be rolled bitten between the rolling rolls is stopped. For this reason, it is possible to suppress a decrease in the manufacturing efficiency of the steel sheet.

It is a figure which shows schematic structure of the steel plate manufacturing line provided with the reverse rolling apparatus of this invention. It is a figure which shows the positional relationship of a pair of rolling roll and a to-be-rolled material at the time of manufacture of a steel plate. It is a figure which shows the relationship between the circumferential speed of the work roll which comprises a rolling roll, or the circumferential speed of a conveyance roll, and the elapsed time at the time of steel plate manufacture.

(First embodiment)
Hereinafter, a first embodiment of the present invention (hereinafter referred to as “the present embodiment”) will be described with reference to the drawings.
(Constitution)
First, the structure of the reverse rolling apparatus of this embodiment is demonstrated using FIG.
FIG. 1 is a diagram showing a schematic configuration of a steel plate production line L provided with a reverse rolling apparatus 1 of the present embodiment.
The reverse rolling apparatus 1 is an apparatus that is applied to a steel sheet production line L that rolls a material to be rolled to produce a steel sheet, and is a reverse rolling machine 2, a rolling roll rotating mechanism 4, a conveying roll 6, and a conveying roll rotating mechanism. 8 and a roll rotation control unit 10.

The reverse rolling mill 2 is a facility for rolling the material to be rolled S, and is disposed between the entry side table 12 and the exit side table 14 in the conveying direction of the material to be rolled S.
The entry-side table 12 conveys the material to be rolled S from the equipment (for example, a heating furnace) (not shown) arranged on the upstream side in the conveyance direction of the material to be rolled S from the reverse rolling mill 2 to the reverse rolling mill 2. Equipment.
The delivery table 14 is a facility (not shown) (for example, an accelerated cooling facility) in which the rolled material S rolled by the reverse rolling machine 2 is arranged downstream of the reverse rolling machine 2 in the conveying direction of the rolled material S. It is equipment to convey to.

Moreover, the reverse rolling mill 2 includes a pair of rolling rolls 16.
Each of the pair of rolling rolls 16 is rotatably supported by a work roll 18 that presses and rolls the material to be rolled S while rotating and a support mechanism (not shown). A backup roll 20 is provided to press the back.
The rolling roll rotating mechanism 4 is formed using a motor (electric motor), and rotates the work roll 18 based on an information signal input from a rolling roll rotating mechanism control unit 22 described later.
The conveyance roll 6 forms the entry side table 12 and the exit side table 14, and conveys the material to be rolled S placed on the upper part by rotating.

The transport roll rotating mechanism 8 is formed using a motor (electric motor), and based on an information signal input from a transport roll rotating mechanism control unit 24 described later, the transport roll 6, specifically, the entry side table 12. And the plurality of transport rolls 6 forming the exit table 14 are rotated.
The roll rotation control unit 10 is formed using, for example, a PC (Personal Computer) or the like, and includes a rolling roll rotation mechanism control unit 22 and a transport roll rotation mechanism control unit 24.

  The rolling roll rotating mechanism control unit 22 calculates the driving state of the rolling roll rotating mechanism 4 based on the preset conveyance speed and rolling speed of the material S to be rolled. Then, the driving state of the rolling roll rotating mechanism 4 is controlled by outputting an information signal including the calculated driving state to the rolling roll rotating mechanism 4. The rolling roll 16 can be driven by the rolling roll rotating mechanism 4 by either a method of driving the work roll 18 or a method of driving the backup roll 17.

Further, the rolling roll rotating mechanism control unit 22 sets the biting speed V _out [mm / s] so that the elapsed time T _out [sec] calculated by the following equation (1) is the shortest.
Here, the biting speed V _out [mm / s] is the workpiece of the rolling rolls 16 at the time when the material S being rolled between the pair of rolling rolls 16 is bitten from between the pair of rolling rolls 16. This is the peripheral speed of the roll 18.
Further, the elapsed time T _out [sec] is obtained by biting the material to be rolled S, which is rolled between the pair of rolling rolls 16, from between the pair of rolling rolls 16, and between the pair of rolling rolls 16 by the transport roll 6. It is the elapsed time until the rolled material S that has been bitten is stopped at a preset stop position.

Here, L _out [mm] in the above formula (1) indicates a material stop distance that is a distance from the pair of rolling rolls 16 to the stop position described above.
In this embodiment, the stop position is a temperature measurement position for measuring the temperature of the rolled material S after rolling, and a plate thickness measurement for measuring the thickness of the rolled material S after rolling. A case where two positions are set will be described. Therefore, in this embodiment, two types of material stop distances L _out [mm] are set.

Further, α [mm / s ² ] in the above formula (1) is the acceleration of the peripheral speed of the transport roll 6 rotated by the rolling roll rotating mechanism 4 and the transport roll rotating mechanism 8, and is the rolling roll rotating mechanism 4 and the transport. This is a fixed value determined by the performance of the roll rotation mechanism 8.
In the present embodiment, as an example, the rolling roll rotation mechanism control unit 22 sets the biting speed V _out [mm / s] to a rolling speed at which the material to be rolled S can be bitten (that is, a work constituting the rolling roll 16. A case where the upper limit value V _out-max [mm / s] of the peripheral speed of the roll 18 is set will be described.
Note that the upper limit V _out-max [mm / s] of the rolling speed at which the material S can be bitten is included, including the performance of the rolling roll rotating mechanism 4 and the transport roll rotating mechanism 8. The value (upper limit value) is set according to the performance of the line L.

  The transport roll rotating mechanism control unit 24 calculates the driving state of the transport roll rotating mechanism 8 based on the preset transport speed and rolling speed of the material S to be rolled. Then, by outputting an information signal including the calculated drive state to the transport roll rotation mechanism 8, the drive state of the transport roll rotation mechanism 8 is controlled. The driving state of the transport roll rotating mechanism 8 is synchronized with the driving state of the rolling roll rotating mechanism 4.

(Reverse rolling method)
Hereinafter, with reference to FIG. 1, the reverse rolling method performed with the reverse rolling apparatus 1 provided with said structure is demonstrated.
The reverse rolling method of this embodiment has a rolling roll rotation mechanism control step for controlling the driving state of the rolling roll rotation mechanism 4.
In the rolling roll rotation mechanism control step, the above-described biting speed V _out [mm / s] is set so that the elapsed time T _out [sec] calculated by the above equation (1) is the shortest.
In this embodiment, as an example, in the rolling roll rotating mechanism control step, the biting speed V _out [mm / s] is set to the rolling speed at which the material S can be bitten (that is, the work roll constituting the rolling roll 16). The case where the upper limit value V _out-max [mm / s] is set will be described.

(Operation / Action)
Hereinafter, the operation and action of the reverse rolling apparatus 1 having the above-described configuration and the reverse rolling method performed by the reverse rolling apparatus 1 will be described with reference to FIG.
In the steel plate production line L provided with the reverse rolling device 1 of the present embodiment, when the rolled material S is rolled to produce a steel plate, first, as shown in FIG. The material S to be rolled is conveyed between the pair of rolling rolls 16, specifically, between the pair of work rolls 18. FIG. 2 is a diagram showing a positional relationship between the pair of rolling rolls 16 and the material to be rolled S at the time of manufacturing the steel plate. Here, the position of the material S to be rolled on the delivery side table 14 is the reverse rolling machine out of the longitudinal ends of the material S from the center of the reverse rolling machine 2, that is, the position of the pair of work rolls 18. It can be defined as the distance to the end on the 2 side.

  At this time, the rolling roll rotation mechanism control unit 22 included in the reverse rolling apparatus 1 of the present embodiment accelerates the rolling speed, that is, the peripheral speed of the work roll 18 as time passes, as indicated by a solid line in FIG. Let FIG. 3 is a diagram showing the relationship between the peripheral speed of the work roll 18 constituting the rolling roll 16 or the peripheral speed of the transport roll 6 and the elapsed time at the time of manufacturing the steel sheet. In FIG. 3, the vertical axis indicates the peripheral speed of the work roll 18 (described as “rolling speed” in the figure) or the peripheral speed of the transport roll 6 (described as “transport speed” in the figure). The abscissa indicates the elapsed time during manufacture of the steel sheet (denoted as “elapsed time [sec]” in the figure).

Here, in the region before the time point t3 when the tail end of the material S to be rolled is bitten between the pair of work rolls 18, the vertical axis indicates the peripheral speed of the work roll 18 (in the drawing, “rolling speed”). In the region where the elapsed time is after the time point t3, the vertical axis indicates the peripheral speed of the transport roll 6 (denoted as “transport speed” in the drawing).
In addition, at the time t3 when the tail end of the material S to be rolled is bitten from between the pair of work rolls 18, the peripheral speed of the work roll 18 (described as “rolling speed” in the drawing) and the conveyance roll 6 The circumferential speed (denoted as “conveying speed” in the figure) matches.

  Thereby, the rolling roll rotation mechanism control part 22 with which the reverse rolling apparatus 1 of this embodiment is provided bites the front-end | tip of the to-be-rolled material S between a pair of rolling rolls 16, specifically between a pair of work rolls 18. FIG. The peripheral speed of the work roll 18 at the time point (indicated as “rolling mill bite” and “t1” in FIG. 3) approximates the peripheral speed corresponding to the preset conveying speed of the material S to be rolled. Thus, the drive state of the rolling roll rotating mechanism 4 is controlled.

As shown in FIG. 2B, the material to be rolled S having its tip inserted between the pair of work rolls 18 moves toward the exit table 14 while being rolled by the pair of work rolls 18.
At this time, the rolling roll rotation mechanism control unit 22 included in the reverse rolling apparatus 1 of the present embodiment has the leading end of the material to be rolled S inserted between the pair of work rolls 18 as indicated by a solid line in FIG. As time elapses from time t1, the peripheral speed of the work roll 18 is accelerated.

Thereby, the rolling roll rotation mechanism control part 22 with which the reverse rolling apparatus 1 of this embodiment is equipped is the time when predetermined time passed from the time t1 when the front-end | tip of the to-be-rolled material S was bitten between a pair of work rolls 18. The circumferential speed of the work roll 18 at the time indicated as “t2” in FIG. 3 is described as the maximum rolling speed V _max [mm / s] (in FIG. 3, “the maximum rolling speed: V _max ” is described). To control.
Therefore, after the time point t2, the outgoing side table is rolled while the material to be rolled S is rolled between the pair of work rolls 18 with the peripheral speed of the work roll 18 being accelerated to the maximum rolling speed V _max [mm / s]. Move towards 14.

In a state where the peripheral speed of the work roll 18 is accelerated to the maximum rolling speed V _max [mm / s], the material to be rolled S rolled between the pair of rolling rolls 16 is moved toward the delivery side table 14. Accordingly, as shown in FIG. 2C, the tail end is bitten from between the pair of work rolls 18.

Here, when the tail end of the rolled material S is released chewing, for the purpose of ensuring the stability of the rolling, the rolling speed, the rolling maximum speed V _{max [mm} / s], chewing releasing possible rolling speed The speed is reduced to a biting speed V _out [mm / s] which is a rolling speed equal to or lower than an upper limit value V _out-max [mm / s] (described as “V _out-max ” in FIG. 3). For this reason, the rolling roll rotation mechanism control part 22 with which the reverse rolling apparatus 1 of this embodiment is equipped has the tail end of the to-be-rolled material S bitten from between a pair of work rolls 18, as shown with a continuous line in FIG. At the time (indicated as “t3” in FIG. 3), the peripheral speed of the work roll 18 is released from the biting speed V _out [mm / s] (in FIG. 3, “biting off speed: V _out ” is described. To maintain).

Thereby, the rolling roll rotation mechanism control part 22 with which the reverse rolling apparatus 1 of this embodiment is equipped is the peripheral speed of the work roll 18 in the time t3 when the tail end of the to-be-rolled material S was bitten from between a pair of work rolls 18. chewing release speed _V out [mm / s] is set below the upper limit value _{V out-max} possible rolling speed release bite the rolled material S [mm / s] (the rolling roll rotation mechanism control step).

After the tail end of the material to be rolled S is bitten from between the pair of work rolls 18, as shown in FIG. 2 (d), the pair of works are conveyed by the transport roll 6 that rotates in synchronization with the work roll 18. The material to be rolled S that is bitten from between the rolls 18 is conveyed to one of two preset stop positions P (temperature measurement position P1, plate thickness measurement position P2) and stopped.
At this time, in this embodiment, regardless of whether the stop position P of the material S to be rolled is the temperature measurement position P1 or the plate thickness measurement position P2, the biting is the peripheral speed of the work roll 18 at the time t3. The speed V _out [mm / s] is set to be equal to or less than the upper limit value V _out-max [mm / s] of the rolling speed at which the material S can be bitten.

That is, in this embodiment, the peripheral speed of the conveyance roll 6 that conveys the material to be rolled S that is bitten from between the pair of work rolls 18 is such that the tail end of the material to be rolled S is bitten from between the pair of work rolls 18. At the time point t3, the rolling speed is set to a value equal to or less than the upper limit value V _out-max [mm / s] of the rolling speed at which the material S can be bitten and equal to the biting speed V _out [mm / s]. Yes.
The biting speed V _out [mm / s] is preferably equal to the upper limit value V _out-max [mm / s] of the rolling speed at which the material S can be bitten.

Here, since the circumferential speed acceleration α [mm / s ² ] of the transport roll 6 rotated by the transport roll rotation mechanism 8 is a fixed value determined by the performance of the transport roll rotation mechanism 8, the time rolls. The degree of deceleration of the peripheral speed of the transport roll 6 that decelerates has a constant inclination.
Therefore, the elapsed time T _out [sec] described above changes according to the material stop distance L _out [mm] and the biting speed V _out [mm / s] described above.
For this reason, it is set to a value equal to or less than the upper limit value V _out-max [mm / s] of the rolling speed at which the material S can be bitten at the time point t3 and equal to the biting speed V _out [mm / s]. The biting speed V _out [mm / s] when the peripheral speed of the transport roll 6 is decelerated toward 0 [mm / s] (stop) (indicated by “t4” in FIG. 3). ] Is higher, the faster.

And after said time t4, as shown with a continuous line in FIG. 3, the circumferential speed acceleration (alpha) [mm / s < ² >] of the conveyance roll 6 in which the circumferential speed of the conveyance roll 6 rotates with the conveyance roll rotation mechanism 8 is shown. The speed is reduced toward 0 [mm / s] with a degree of deceleration corresponding to the speed of 0 [mm / s] when the material to be rolled S is conveyed to the stop position P (indicated as “t5” in FIG. 3). ].
As described above, in the reverse rolling apparatus 1 of the present embodiment and the reverse rolling method performed by the reverse rolling apparatus 1 (hereinafter sometimes referred to as “the present embodiment”), the material stop distance L _out [ mm] and the peripheral speed acceleration α [mm / s ² ] of the transport roll 6, the biting speed V _out [mm / s] is set to the above equation (1) and the elapsed time T _out [sec] Is set to be the shortest.

For this reason, in this embodiment, a plurality of stop positions for stopping the rolled material S after rolling are set, and a plurality of material stop distances L _out [mm] are set according to the stop positions at the plurality of places. Even if it is the case, the biting speed V _out [mm / s] is individually set so as to minimize the elapsed time T _out [sec] according to a plurality of material stop distances L _out [mm]. It becomes possible to set to.

On the other hand, the reverse rolling method (hereinafter, sometimes referred to as “conventional example”) performed by the reverse rolling apparatus of the conventional example, that is, the biting speed V _out [mm / s] is set to a plurality of material stop distances. In the case of setting a constant value for L _out [mm], for example, when the material to be rolled S after rolling is stopped at a short distance among a plurality of material stop distances L _out [mm], As shown by a broken line in FIG. 3, the biting speed V _out [mm / s] at the time point t3 is lower than that in the present embodiment.

Also in the conventional example, the peripheral speed acceleration α [mm / s ² ] of the transport roll 6 is a fixed value as in the present embodiment, and therefore the peripheral speed of the transport roll 6 that decelerates over time. The degree of deceleration is a constant slope.
For this reason, in the conventional example, as indicated by a broken line in FIG. 3, the biting set to be equal to or less than the upper limit value V _out-max [mm / s] of the rolling speed at which the material S can be bitten at the time point t3. Time that elapses between the time point t3 when the release speed V _out [mm / s] is decelerated toward 0 [mm / s] (stop) (the time point indicated as “t6” in FIG. 3) and the time point t3. This is longer than the time that elapses between time t4 and time t3, which are similar time points in the present embodiment.

Therefore, in the conventional example, after the above-described time t6, as indicated by a broken line in FIG. 3, the peripheral speed of the transport roll 6 is reduced to 0 [mm / s], and the material to be rolled S is moved to the stop position P. The time that elapses between the time point of conveyance (the time point indicated as “t7” in FIG. 3) and the time point t3 is the same as the time point elapses between the time point t5 and the time point t3 in the present embodiment. Also gets longer.
For this reason, in this embodiment, compared with a prior art example, it becomes possible to shorten the conveyance time until the to-be-rolled material S bitten from between a pair of rolling rolls 16 stops after rolling.

  In FIG. 3, the area of the region sandwiched between the solid line (this embodiment) and the horizontal axis after the time t3 and the broken line (conventional example) and the horizontal axis after the time t3. The area of each region corresponds to the moving distance until the material S to be rolled bitten between the pair of rolling rolls 16 stops at the stop position P set in advance from the biting position. Are equal to each other.

Here, the area of the region sandwiched between the solid line (this embodiment) and the horizontal axis in the portion after time t3 is the length of the elapsed time from time t3 to time t4 (length of the horizontal axis). This implementation is performed on the area multiplied by the length of the biting speed V _out [mm / s] of the form (length of the vertical axis) and the length of the elapsed time from the time t4 to the time t5 (length of the horizontal axis) It is a total value with the area which multiplied by the length (length of a vertical axis | shaft) of the biting speed _Vout [mm / s] of a form, and divided by 2.

On the other hand, the area of the region sandwiched between the broken line (conventional example) and the horizontal axis in the portion after time t3 is the same as that of the conventional example in the length of time (horizontal axis length) from time t3 to time t6. The conventional release of the release speed V _out [mm / s] is multiplied by the length (vertical axis length) and the elapsed time from the time point t6 to the time point t7 (horizontal axis length). It is the total value of the area obtained by multiplying the length of the velocity V _out [mm / s] (length of the vertical axis) and dividing by 2.

(Effects of the first embodiment)
The effects of this embodiment are listed below.
(1) In the reverse rolling apparatus 1 of the present embodiment, the rolling roll rotating mechanism control unit 22 has a fixed material stop distance L _out [mm] and a peripheral roll acceleration α [mm / s ² ] which are fixed values. Accordingly, the biting speed V _out [mm / s] is set so that the elapsed time T _out [sec] calculated by the above equation (1) becomes the shortest.

For this reason, a plurality of stop positions for stopping the rolled material S after rolling are set, and a plurality of material stop distances L _out [mm] are set according to the stop positions at the plurality of places. However, according to a plurality of material stop distances L _out [mm], the biting speed V _out [mm / s] can be set so that the elapsed time T _out [sec] is the shortest. It becomes.
As a result, even when a plurality of stop positions for stopping the material to be rolled S are set, the conveyance time until the material to be rolled S bitten from between the pair of rolling rolls 16 is stopped is shortened. Therefore, it is possible to suppress a decrease in manufacturing efficiency of the steel sheet.

In addition, since the calculation program performed by the rolling roll rotating mechanism control unit 22 is modified without adding new components to the existing reverse rolling apparatus 1, the above-described transport time can be shortened. In addition, it is possible to suppress an increase in cost related to the manufacture of the steel sheet.
(2) In the reverse rolling apparatus 1 of the present embodiment, the rolling roll rotation mechanism control unit 22 sets the biting speed V _out [mm / s] to the upper limit value V _{out of the} rolling speed at which the material S can be bitten. _-Max Set to [mm / s].

For this reason, the higher the biting speed _Vout [mm / s], the faster the rolling material S after rolling, the peripheral speed of the transport roll 6 is decelerated from the biting speed _Vout [mm / s] in order to stop. It is possible to set the time to be the fastest time based on the performance of the transport roll 6.
As a result, even when a plurality of stop positions for stopping the material to be rolled S are set, the conveying time until the material to be rolled S bitten from between the pair of rolling rolls 16 is stopped is conveyed. Since it becomes possible to set it as the shortest time based on the performance of the roll 6, it becomes possible to suppress the fall of the manufacturing efficiency of a steel plate.

(3) In the reverse rolling method of this embodiment, in the rolling roll rotating mechanism control step, according to the material stop distance L _out [mm], which is a fixed value, and the acceleration α [mm / s ² ] of the peripheral speed of the transport roll 6. Thus, the biting speed V _out [mm / s] is set so that the elapsed time T _out [sec] calculated by the above equation (1) becomes the shortest.
For this reason, a plurality of stop positions for stopping the rolled material S after rolling are set, and a plurality of material stop distances L _out [mm] are set according to the stop positions at the plurality of places. However, according to a plurality of material stop distances L _out [mm], the biting speed V _out [mm / s] can be set so that the elapsed time T _out [sec] is the shortest. It becomes.

As a result, even when a plurality of stop positions for stopping the material to be rolled S are set, the conveyance time until the material to be rolled S bitten from between the pair of rolling rolls 16 is stopped is shortened. Therefore, it is possible to suppress a decrease in manufacturing efficiency of the steel sheet.
In addition, by adding a new step to the existing reverse rolling method and modifying the processing program performed in the rolling roll rotating mechanism control step, it is possible to shorten the transport time described above. It is possible to suppress an increase in manufacturing costs.

(4) In the reverse rolling method of this embodiment, in the rolling roll rotating mechanism control step, the biting speed V _out [mm / s] is set to the upper limit value V _{out-max of the} rolling speed at which the material S can be bitten. Set to [mm / s].
For this reason, the higher the biting speed _Vout [mm / s], the faster the rolling material S after rolling, the peripheral speed of the transport roll 6 is decelerated from the biting speed _Vout [mm / s] in order to stop. It is possible to set the time to be the fastest time based on the performance of the transport roll 6.
As a result, even when a plurality of stop positions for stopping the material to be rolled S are set, the conveying time until the material to be rolled S bitten from between the pair of rolling rolls 16 is stopped is conveyed. Since it becomes possible to set it as the shortest time based on the performance of the roll 6, it becomes possible to suppress the fall of the manufacturing efficiency of a steel plate.

(Modification)
Hereinafter, modifications of the present embodiment will be listed.
(1) In the reverse rolling apparatus 1 of the present embodiment, the configuration of the rolling roll rotating mechanism control unit 22 is set so that the biting speed V _out [mm / s] is the upper limit value of the rolling speed at which the material S can be bitten. Although it is set as the structure set to _Vout-max [mm / s], it is not limited to this. That is, the configuration of the rolling roll rotating mechanism control unit 22 is configured so that the biting speed V _out [mm / s] is less than the upper limit value V _out-max [mm / s] of the rolling speed at which the material S can be bitten. The configuration may be set. In short, the configuration of the rolling roll rotating mechanism control unit 22 may be configured so that the elapsed time T _out [sec] calculated by the above equation (1) is set to the shortest.

(2) In the reverse rolling method of this embodiment, in the rolling roll rotating mechanism control step, the biting speed V _out [mm / s] is set to the upper limit value V _{out-max of the} rolling speed at which the material S can be bitten. Although the process set to [mm / s] was performed, the process performed in a rolling roll rotation mechanism control step is not limited to this. That is, the process performed in the rolling roll rotating mechanism control step is a process of setting the biting speed V _out [mm / s] to be less than the upper limit value V _{out-max of the} rolling speed at which the material S can be bitten. May be. In short, the process performed in the rolling roll rotating mechanism control step may be a process that sets the elapsed time T _out [sec] calculated by the above equation (1) to be the shortest.

(Example)
Hereinafter, with reference to FIG. 1 to FIG. 3, the elapsed time T _out [sec] described above was compared in the steel sheet production line L provided with the reverse rolling apparatus 1 of the comparative example and the example of the present invention using FIG. 4. The results will be described.
In addition, the structure of the reverse rolling apparatus 1 of this invention example and the steel plate production line L is the same as that of 1st embodiment mentioned above.

On the other hand, the configuration of the reverse rolling apparatus and the steel sheet production line of the comparative example sets the biting speed V _out [mm / s] to a fixed value regardless of the respective stop positions set at a plurality of locations. Except for the point, it is the same structure as the reverse rolling apparatus 1 and steel plate production line L of the first embodiment.
Thereby, in the steel plate production line L provided with the reverse rolling device 1 of the present invention example, compared with the steel plate production line provided with the reverse rolling device of the comparative example, the material to be rolled bitten from between the pair of rolling rolls 16. The conveyance time until the material S stops can be shortened by about 0.6 seconds from about 3.0 seconds to about 2.4 seconds, and it is possible to suppress a decrease in the manufacturing efficiency of the steel sheet. It was confirmed.

DESCRIPTION OF SYMBOLS 1 Reverse rolling apparatus 2 Reverse rolling mill 4 Rolling roll rotation mechanism 6 Conveyance roll 8 Conveyance roll rotation mechanism 10 Roll rotation control part 12 Entrance side table 14 Outlet side table 16 Rolling roll 18 Work roll 20 Backup roll 22 Rolling roll rotation mechanism control part 24 Transport roll rotation mechanism control part L Steel plate production line S Rolled material P1 Temperature measurement position P2 Plate thickness measurement position

Claims (4)

A reverse rolling device for performing rolling a plurality of times by reciprocating a material to be rolled between a pair of rolling rolls,
A rolling roll rotating mechanism for rotating the rolling roll;
A rolling roll rotating mechanism control unit for controlling a driving state of the rolling roll rotating mechanism;
A conveying roll for conveying the material to be rolled bitten from between the pair of rolling rolls to a plurality of preset stop positions;
A transport roll rotating mechanism for rotating the transport roll,
The rolling roll rotation mechanism control unit, said pair of rolling elapsed time T _out of the material to be rolled which is rolled between rolls to be stopped at the stop position of the plurality of positions and release bite from between the pair of rolling rolls [Sec], and a plurality of types of material stop distances that are distances from the pair of rolling rolls to the stop positions at the plurality of locations are L _out [mm], and the peripheral speed of the transport roll rotated by the transport roll rotating mechanism The acceleration is α [mm / s ² ], and the peripheral speed of the work roll constituting the rolling roll at the time when the material being rolled between the pair of rolling rolls is released from between the pair of rolling rolls. some chewing release rate when the _V out [mm / s], in response to said plurality of types of materials stop distance _L out [mm], the chewing release velocity _V out a [mm / s], following Reverse rolling apparatus the elapsed time calculated by the formula T _{out [sec]} which is characterized in that set to be shortest.

The rolling roll rotating mechanism control unit sets the biting speed V _out [mm / s] to an upper limit value V _out-max [mm / s] of a rolling speed at which the material to be rolled can be bitten. The reverse rolling apparatus according to claim 1, wherein the reverse rolling apparatus is characterized. A reverse rolling method in which a material to be rolled is reciprocated between a pair of rolling rolls and rolled a plurality of times,
A rolling roll rotation mechanism control step for controlling a driving state of a rolling roll rotation mechanism for rotating the rolling roll;
In the rolling roll rotating mechanism control step, an elapsed time until the material being rolled between the pair of rolling rolls is bitten from between the pair of rolling rolls and stopped at a plurality of preset stop positions. T _out [sec], and a plurality of types of material stop distances, which are distances from the pair of rolling rolls to the stop positions at the plurality of places, are L _out [mm], and are bitten from between the pair of rolling rolls. The acceleration of the peripheral speed of the conveyance roll which conveys a to-be-rolled material to the said several stop position is set to (alpha) [mm / s < ² >], The said to-be-rolled material currently rolled between the said pair of rolling rolls is a pair of rolling rolls when the chewing release rate is a peripheral speed of the work rolls which constitute the rolling rolls at the time of releasing chewing was V _{out [mm} / s] from between the plurality of types of materials stop distance L _ou Depending on the [mm], a reverse rolling the chewing release velocity _V out [mm / s], the elapsed time _T out [sec] is calculated by the following equation and sets so that the shortest Method.

In the rolling roll rotating mechanism control step, the biting speed V _out [mm / s] is set to an upper limit value V _out-max [mm / s] of a rolling speed at which the material to be rolled can be bitten. The reverse rolling method according to claim 3, wherein the reverse rolling method is performed.

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