JP5741039B2 - Rolling material conveyance control method in hot rolling line - Google Patents

Description

  The present invention relates to a method for controlling the conveyance of a rolled material in a hot rolling line.

  In the conventional rolling material conveyance control method, the time from the material extraction time to the arrival of each facility is predicted and calculated in the heating furnace of the rolled material so that there is no interference between the preceding material and the following material. By determining the material extraction time and automatically extracting the material from the heating furnace, a necessary pitch between the materials is secured at each facility position. However, on the hot rolling line, there is an error between the predicted calculation and the actual results due to slippage between the rolling mill and the rolling material during width rolling or horizontal rolling, and slipping of the rolling material during table transport. Often occurs.

  As a technique for reducing such an error, there is a technique that uses an oscillation in which the conveyance table roller is operated alternately in the forward and reverse directions as a standby function for avoiding a collision between rolled materials with respect to the generated error (for example, , See Patent Document 1). Moreover, in order to make the pitch between rolling constant, the tail end position of the preceding material which changes every moment is continuously detected using a rolling material position detector or the like, and the conveyance speed of the succeeding material is changed. There is also a control method (see, for example, Patent Document 2).

JP 2000-1117312 A Japanese Examined Patent Publication No. 63-119922

  In controlling the pitch between rollings, as the finishing mill is approached, the error between the estimated arrival time at each equipment position and the actual result is accumulated, while the required accuracy generally increases and the error of 1 second increases. But the impact is great.

  However, in general, the estimated rolling time required for the finish rolling mill of the preceding material is different from the actual results because it varies depending on various operating factors, and in order to control the pitch between rollings accurately, as in Patent Document 1 Instead of using the estimated rolling time calculated in the heating furnace as it is, it is necessary to perform correction or recalculation based on results. Moreover, in the method like patent document 2, it is possible to obtain a change amount of the conveyance speed sufficient for controlling the pitch between rollings by the capability of the heating device at the end portion in the material width direction arranged on the finishing mill side. There are cases where it is not possible.

  The present invention has been made in view of the above, and when the method as in Patent Document 2 cannot be used, the actual rolling speed when the preceding material is caught in the first stand of the finish rolling mill is used. An object of the present invention is to provide a method for controlling the conveyance of a rolled material in a hot rolling line that can accurately estimate the time required for rolling the preceding material by performing correction or recalculation.

  In order to solve the above-described problems and achieve the object, a method for controlling the conveyance of a rolled material in a hot rolling line according to the present invention includes a heating furnace, a rough rolling mill, and a finish rolling mill having a plurality of stands. It is a hot rolling line, and the rolling material is oscillated at a stand-by position by predicting and calculating the time when the leading and trailing ends of the preceding material and the succeeding material reach the respective equipment positions. In the conveyance control method of the rolled material in the hot rolling line controlled to the pitch, when the preceding material bites into the rolling roll of the leading stand of the finishing mill, after the leading stand in the finishing mill It is characterized in that the required rolling time of the preceding material is estimated using the actual rotation speed of the rolling roll of any stand that is already set to the conveyance speed of the preceding material and is rotating. That.

  In addition, the method for controlling the transport of a rolled material in a hot rolling line according to the present invention is the stand located at the most downstream position in any of the stands that are already set and rotated at the transport speed of the preceding material. The actual rotation speed of the rolling rolls is used.

  According to the present invention, the performance of the rolling roll of any stand that has already been set and rotated at the conveying speed of the preceding material in the finishing mill when the preceding material bites into the first stand of the finishing mill. By performing correction or recalculation using the rotation speed, it is possible to accurately estimate the rolling time required for the preceding material.

FIG. 1 is a schematic side view showing an example of equipment arrangement of a hot rolling line according to the present embodiment. FIG. 2 is a schematic flowchart illustrating an example of a control process executed by the control device.

  Below, an embodiment of a conveyance control method of a rolling material in a hot rolling line concerning the present invention is described in detail based on a drawing. Note that the present invention is not limited to the embodiments.

  FIG. 1 is a schematic side view showing an example of equipment arrangement of the hot rolling line according to the present embodiment, and FIG. 2 is a schematic flowchart showing an example of control processing executed by the control device. The hot rolling line of the present embodiment includes a heating furnace 1, a rough rolling mill 2 indicated by R1 to R3, a finishing rolling mill 3 having a plurality of stands F1 to F7, a winder 4 and a rolling material 5 between these facilities. It is comprised from the conveyance roller table etc. which are not shown in figure. Moreover, the control apparatus 6 which controls each of these parts is provided.

  Here, the rolling material extraction timing from the heating furnace 1 is the stage in which the rolling material 5 is in the heating furnace 1, based on the thickness, width, length, mechanical characteristics, and the like in the rough rolling mill 2 and the finish rolling mill 3. The rolling schedule is calculated, and based on this rolling schedule, the transport time from the heating furnace extraction to the arrival of each equipment position is calculated, and the time required for collision with the preceding material and setting change of the rolling mills 2 and 3 is calculated. In consideration, the minimum pitch between rollings is determined so that there is no interference.

  However, in the process of transporting the rolled material 5 from the heating furnace extraction to the finishing mill 3, if an error occurs between the predicted transport time and the actual result due to slipping or the like, the error between the rolled material 5 is generated with respect to the generated error. In order to avoid interference, the pitch between rollings is adjusted by oscillating on a conveying table roller provided between R2 and R3 in the rough rolling mill 2. Here, when the part where the pitch between rollings is to be adjusted to a predetermined pitch is the pitch check point 7 between rollings shown in FIG. 1, the tail end of the preceding material 5b is the pitch check point 7 between the rollings during the oscillation time. Can be determined such that the difference between the time at which the tip of the succeeding material 5c passes the pitch check point 7 between rollings is a predetermined pitch. In order to accurately obtain the time at which the tail end of the preceding material 5b passes the rolling pitch check point 7, it is necessary to accurately estimate the speed and length of the preceding material 5b.

  However, since the rolling schedule determined in the heating furnace 1 and the actual rolling schedule are often different, in order to accurately estimate the speed of the preceding material 5b, the actual rotation of the horizontal rolling roll 3a of the finishing mill 3 is determined. The number (actual rotation speed) should be used. The timing for obtaining the actual number of revolutions of the horizontal rolling roll 3a requires time for the succeeding material 5c to catch up with the preceding material 5b, and it is necessary to determine the oscillation time at an early stage. However, it is preferable to bite the top stand F1 of the finishing mill 3 in which the manual intervention operation or the like has been completed into the horizontal rolling roll 3a. Furthermore, when the leading end of the preceding material 5b is caught in the horizontal rolling roll 3a of the top stand F1, the actual rotational speed of the horizontal rolling roll 3a of the stand F1 is temporarily reduced by several percent due to the biting load. It is good to obtain from any of the horizontal rolling rolls 3a of the stands F2 to F4 which are already set to the conveyance speed of the preceding material 5b and are already rotating after the stand F1. Further, regarding the downstream stands F5 to F7 in the finish rolling mill 3, as shown in FIG. 1, the tail end of the preceding preceding material 5a is being bitten, or the setting for the preceding material 5b is used. Since it is being changed, it is not preferable to acquire the actual number of revolutions of the horizontal rolling rolls 3a of these stands F5 to F7.

  Therefore, in the present embodiment, control is performed as shown in FIG. First, when the leading end of the preceding material 5b detects that the leading stand F1 of the finish rolling mill 3 is caught in the horizontal rolling roll 3a (step S1), the finishing mill 3 has already reached the transport speed for the preceding material 5b. The actual rotation speed of the horizontal rolling roll 3a of the stand F4 located at the most downstream position among the set and rotating stands F2 to F4 is acquired (step S2). Next, the time required for finish rolling of the preceding material 5b is estimated by correction or recalculation (step S3). Further, the conveyance time at which the tail end of the preceding material 5b reaches the inter-rolling pitch check point 7 is determined from the estimated finish rolling required time (step S4), and the determined conveyance time of the tail end of the preceding material 5b and after The standby time of the succeeding material 5c is determined from the conveyance time at which the tip of the material 5c reaches the pitch check point 7 during rolling (step S5).

  Therefore, according to the present embodiment, the preceding material 5b is already set to the conveying speed of the preceding material 5b and is rotating in the finishing mill 3 when the preceding material 5b is engaged with the first stand F1 of the finishing mill 3. By performing correction or recalculation using the actual rotational speed of the horizontal rolling roll 3a of the stand F4, it is possible to accurately estimate the time required for rolling the preceding material 5b. As a result of accurately estimating the required rolling time of the preceding material 5b in this way, by calculating and determining an appropriate standby time for the succeeding material 5c, variation in pitch between rollings can be reduced and rolling can be performed with high efficiency. can do.

  In the present embodiment, the actual rotational speed of the horizontal rolling roll 3a of the most downstream stand F4 that has already been set to the conveyance speed of the preceding material 5b after the leading stand F1 is used. However, the actual rotation speed of the horizontal rolling roll 3a of the stand F2 or F3, which is already set to the conveyance speed of the preceding material 5b when the first stand F1 of the finishing mill 3 is bitten, may be used. Further, with respect to the further downstream stands F5 to F7, when the preceding material 5b is bitten into the first stand F1 of the finish rolling mill 3, the tail end of the preceding leading material 5a is not bitten, and the preceding material 5b has already been bitten. If it is a case where it is set to this conveyance speed, you may make it use the actual rotational speed of any of these horizontal rolling rolls 3a.

DESCRIPTION OF SYMBOLS 1 Heating furnace 2 Rough rolling mill 3 Finishing rolling mill 5a Ahead preceding material 5b Advancing material 5c Subsequent material F1-F7 Stand

Claims (2)

A hot rolling line including a heating furnace, a rough rolling mill, and a finish rolling mill having a plurality of stands, and predicting and calculating the time at which the leading and trailing ends of the preceding and succeeding materials reach the respective equipment positions By oscillating the rolled material at a stand-by position, and controlling the rolled material in a hot rolling line that is controlled to a predetermined rolling pitch,
When the preceding material is caught in the rolling roll of the top stand of the finishing mill, any of the preceding material in the finishing roll after the leading stand is already set at the conveying speed of the preceding material and rotating. A method for transporting a rolled material in a hot rolling line, wherein the required rolling time of the preceding material is estimated using the rotation speed of a rolling roll of a stand. 2. The heat according to claim 1, wherein the rotation speed of the rolling roll of the stand located at the most downstream position is used in any of the stands that are already set and rotated at the conveyance speed of the preceding material. A method for controlling the conveyance of rolled material in a hot rolling line.

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