JP3034399B2 - Continuous hot rolling control system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous hot-rolling control apparatus for controlling a rolling mill which successively supplies heated slabs by a material joining apparatus, feeds the slabs to a finishing rolling mill, and performs continuous finishing rolling. .

[0002]

2. Description of the Related Art First, continuous hot rolling control according to the prior art will be described with reference to FIGS. Rolling of the slab in the heated state was discontinuous rolling method in which the discontinuous rolling process was performed with the separated slab as it was, and continuous by joining the tail end of the preceding slab and the tip of the succeeding slab through a material joining device. There is a continuous rolling method in which a continuous rolling process is performed as a material. FIG. 2 is a conceptual diagram of a conventional hot rolling facility in the case of discontinuous rolling, and FIG. 3 is a conceptual diagram of a hot rolling facility in the case of continuous rolling.

[0003] In a conventional hot rolling equipment of a discontinuous rolling system, as shown in FIG. 2, a slab reheated in a heating furnace (not shown) is passed through a rough rolling mill 1 to perform rough rolling. Further, after the finish rolling is performed by the finishing mill 2, it is wound around the coiler 3 to generate a hot coil. In the series of rolling processes, the setting change performed for each rolling mill and other related equipment for each material is performed immediately after the material to be processed passes through each equipment on the line until the tip of the next material comes. ,
That is, the process is performed while there is no material on the line, and this is a basic setting method in the case of discontinuous rolling (hereinafter, referred to as a “batch rolling setting method”).

Further, in a continuous hot rolling facility, FIG.
As shown in the figure, a material joining device 4 is disposed between the rough rolling mill 1 and the finishing rolling mill 2, and by using this material joining device 4,
Rolling in the finishing mill 2 is continuously performed by joining the individually separated slabs in series.
In this case, the steps up to the rough rolling mill 1 are the same as in the case of the non-continuous rolling, but continuous rolling is performed in the finishing mill 2 located downstream of the material joining apparatus 4. In the case of non-continuous rolling, the material rolled by the finishing mill 2 is cut by the cutting machine 5 arranged in front of the coiler 3 before and after the joint and wound up on the coiler 3 to substantially correspond to the original slab. A hot coil similar to is generated.

In the apparatus shown in FIG. 3, the setting change in the finishing mill 2 or other related equipment for continuous rolling is removed from the final product because there is no particular setting timing such as when stripping the batch rolling setting. In general, the setting is changed when the vicinity of the junction is passing through the junction sensor position (hereinafter, this is referred to as “running distance setting method”). In the case of the continuous rolling method, since the setting of each machine and equipment is changed while the material is passing on the line, the control method of the machine and equipment is different from that when batch rolling is set.

[0006]

However, in the case of the continuous rolling equipment as described above, since the strength of the joint is smaller than that of other parts, there is a characteristic that the material is easily broken at the joint. If the material is bitten into the finish rolling mill 2 in a state where the material break has occurred before being bitten into the finish rolling mill 2, the material portions before and after the break may overlap or the tip of the downstream material after the break may be bent. Biting failure (hereinafter,
"Miss roll").

[0007] When the line is stopped due to such a misroll, it takes a lot of time to recover the line and the loss becomes large, which is not preferable in operation. In addition, when material fracture occurs, the transition from continuous rolling to discontinuous rolling at the time of fracture occurs, so the setting for each equipment must be switched from the running distance setting method during continuous rolling to the batch rolling setting method during discontinuous rolling. However, since there is no material interval before and after the break point for performing the batch rolling setting, the setting cannot be easily changed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned inconvenience, and an object of the present invention is to eliminate the occurrence of misrolling when a finishing mill is caught by a joint breakage during continuous rolling by material joining, thereby achieving stable product production. It is an object of the present invention to provide a continuous hot-rolling control device which makes it possible.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a fracture detecting device which is disposed between a material joining apparatus and a finish rolling mill and detects a material fracture at a joint portion. When a material break is detected by the device, the distance between the material upstream and the material downstream from the break is made equal to that during discontinuous rolling by temporarily lowering the conveying speed of the material upstream from the break. The setting of the finishing mill is switched from the setting method at the time of continuous rolling to the setting method at the time of non-continuous rolling between the time when the preceding material exits the finishing mill and the time when the succeeding material is newly engaged with the conveying speed adjusting device. And a setting method switching device.

[0010]

According to the continuous hot rolling control device of the present invention, a joint material rupture detecting device for detecting a material rupture at a material joint portion is disposed between the material joining device and the finishing mill, and the material rupture of the joint portion is detected. By lowering the conveying speed of the material on the upstream side from the break point, a gap is formed between the material on the upstream side and the material on the downstream side of the break point. By switching from the interval setting method to the batch rolling setting method in which the setting is performed for each material at the time of discontinuous rolling without material joining, it is possible to prevent misrolling when the finishing mill is engaged.

[0011]

Next, an embodiment of the present invention will be described with reference to FIG.

In FIG. 1, the tail end of a preceding material being rolled by a finishing mill 2 on the downstream side of the line and a rough rolling mill 1 on the upstream side of the line.
Is joined by the material joining device 4 to the leading end of the subsequent material that has been roughly rolled. At this time, the joining position calculating device 9 travels from the time of joining the material to the point where the break detector 6 is installed, based on, for example, an output pulse of the pulse generator 8 coupled to the transport device 7. Calculate the position. The break detector 6 is arranged immediately downstream of the transport device 7. A signal indicating the traveling position of the material joint calculated by the joint position calculating device 9 is input to a break detection timing signal generation circuit 10. The break detection timing signal generation circuit 10 outputs an “H” signal when the traveling position of the material joint reaches near the installation point of the break detector 6 and outputs it to AN.
This is an input signal to the first input terminal of the D gate 11. On the other hand, a break detection signal “H” is input to the second input terminal of the AND gate 11 when the break detector 6 detects a material break. If a material break occurs for any reason before the material joint passes through the break detector 6, it is detected by the break detector 6. Since the material breakage can occur at a portion other than the material joint, if the traveling position of the material joint detected by the joint position calculating device 9 corresponds to the installation position of the fracture detector 6, the AND gate 11
Is determined to be a material breakage at the material joint through the control unit, and an "H" signal is output from this.

When a material break occurs at the material joint and the "H" signal is output from the AND gate 11, first, the transfer speed adjusting device 12 controls the speed of the transfer device 7 located upstream of the break detector 6 with respect to the speed reference. Is temporarily reduced, thereby temporarily lowering the conveying speed of the material located upstream of the breaking point to secure the same inter-material pitch as in the discontinuous rolling. On the other hand, the setting method switching device 13 which has received the material break signal from the AND gate 11 sets the setting (for example, the mill gap) for each material (for example, the mill gap) for the finishing mill 2 and other facilities by the running distance setting device 14 during continuous rolling. To the setting by the batch rolling setting device 15 at the time of discontinuous rolling, the material pitch secured by the transfer speed adjusting device 12, that is, after the material downstream of the breaking point passes through the finishing rolling mill. Utilizing the time until the tip of the material upstream of the break point bites into the finishing mill 2,
The setting for the next material is performed for each facility by the batch rolling setting device 15. As a result, even if material breakage occurs at the joint in front of the finishing mill 2 during continuous rolling of the finishing, misrolling at the time of biting into the finishing mill 2 is prevented, and smooth rolling from continuous rolling to discontinuous rolling is performed. The rolling process can be continued without lowering the line production efficiency.

After the continuous operation is continued for an appropriate time, at an appropriate point in time, the batch rolling setting device 15 switches to the travel setting device 1.
4 may be automatically or manually switched.

[0015]

As described above, according to the present invention,
It is possible to detect material rupture at the joint immediately after material joining and automatically and smoothly switch the setting from continuous rolling to discontinuous rolling without lowering the production efficiency of the line and continue rolling.

[Brief description of the drawings]

FIG. 1 is a block diagram of a continuous hot rolling control apparatus according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram of a hot rolling facility in the case of conventional discontinuous rolling.

FIG. 3 is a conceptual diagram of a hot rolling facility in the case of conventional continuous rolling.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rough rolling mill 2 Finishing rolling mill 3 Coiling machine 4 Material joining device 5 Cutting machine 6 Break detector 7 Carrier 8 Pulse generator 9 Joining position calculator 10 Break detection timing signal generation circuit 11 AND gate 12 Transport speed adjusting device 13 Setting method Switching device 14 Running distance setting device 15 Batch rolling setting device

Claims (1)

(57) [Claims] 1. A continuous hot-rolling control device for controlling a rolling mill in which successively supplied heated slabs are joined by a material joining device, fed to a finishing mill, and continuously finish-rolled, comprising: a material joining device. And a break detecting device that is disposed between the finish rolling mill and detects a material break in the joint, and temporarily detects a material break by the break detecting device. A transport speed adjustment device that lowers the distance between the material on the upstream side and the material on the downstream side from the break point by making it lower than that during discontinuous rolling, and the succeeding material newly bites after the preceding material exits the finishing mill And a setting method switching device for switching a setting of the finishing mill from a setting method at the time of continuous rolling to a setting method at the time of discontinuous rolling until the setting is completed.