JPH08309403A - Method for continuous hot rolling of plural plate stocks - Google Patents

Abstract

PURPOSE: To attain a smooth and safe continuous hot rolling operation by running while forming the slack loop of a succeeding rolling plate stock on each descending and retreating roller and joining the cut surface of the rear end of a preceding rolling plate stock and that of the tip of the succeeding rolling plate stock. CONSTITUTION: Each roller 5A interfering at the time of the forwarding, the running and the passing through of a running joining device 4, is descended and retracted successively from a rolling plate stock pass line, and this state is maintained after the forwarding and the passing through. A succeeding rolling plate stock 2 is run while forming gently the slack loop DL of the succeeding rolling plate stock 2 on each roller 5AD descended and retracted, and the cut surface 1A of the rear end of a preceding rolling plate stock 1 and the cut surface 2A of the tip of the succeeding rolling plate stock 2 are butted. The correction of the position of the cut end face 2A of the tip part of the succeeding rolling plate stock 2 at the time of the butting, can be absorbed by the torsion deformation of the loop DL on each roller 5AD descended and retracted sufficiently. Special supporting and control mechanisms are not necessary except rollers 5AD, and it is enough only to install a pinch roll PR by which a speed for forming the slack loop can be varied and controlled.

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 method for a plurality of plate materials such as steel materials.

[0002]

2. Description of the Related Art In continuous hot rolling of steel materials, scratches and shape defects due to no tension, especially in the so-called unsteady parts of the front and tail portions of steel materials, strip width defects due to threading speed, strip thickness defects, and temperatures caused by acceleration In order to minimize the order yield due to non-uniformity of the structure due to defects and poor surface quality, as well as the work of removing defective parts and the work of adjusting plates as much as possible, multiple long steel strips for hot rolling have been sequentially joined in recent years. Then, a so-called continuous hot rolling method of continuously performing hot rolling at a predetermined speed has been attempted.

This continuous hot rolling method is generally a step of supplying a high-temperature long steel sheet for hot rolling in the form of a sheet bar or a coil, a step of cutting the front and rear ends of the steel sheet for rolling, and running. While the rear end of the steel material for preceding rolling and the tip of the steel material for subsequent rolling are clamped together and joined together, and the steel material for rolling is subjected to a predetermined rolling schedule with a predetermined size in a plurality of stands. Between the hot finish rolling step of finishing into a hot finish rolling step, the step of cooling and winding the steel sheet that has gone out of the hot finish rolling step, the hot finish rolling step and the winding step,
It is composed of a running cutting division process of cutting a steel plate in a predetermined weight or length unit.

Therefore, as a running joining device in the joining step, as disclosed in Japanese Patent Laid-Open No. 4-30001, the trailing end clamp device for the preceding rolled plate material and the trailing rolled plate material are provided. As the tip end clamp device, which is capable of swinging and installed so as to be independently movable in the feeding direction and the anti-feeding direction of the rolled plate material, as disclosed in Japanese Patent Publication No. 62-53242, A roller table in which each roller is installed so as to be able to descend and retract and rise from the rolling plate material path line is disposed on the traveling path of the traveling joining device.

The joining of the trailing end portion of the traveling rolling steel material and the leading end portion of the trailing rolling material by this joining device is carried out by rolling each roller which interferes when the traveling joining device travels forward in the rolling steel material pass line. From the front end of the steel strip for forward rolling to the front end of the steel strip for subsequent rolling. After matching
These were to be joined.

[0006]

The rear end portion of the steel material for the preceding rolling and the tip portion of the steel material for the following rolling that have been cut are formed into a flat shape of the steel material itself before being clamped by the clamp device of the traveling joining device. Changes, meandering, and camber often occur, and when it gets harder, the cutting end face of the following rolling steel material is rotated and driven in order to bring the cutting end faces of the respective joining ends into full contact with each other. It is necessary to correct the position, make it parallel to the cutting end face of the rear end of the steel for pre-rolling that cannot be corrected, and then join.

However, since the table rolls on the inlet side and the outlet side of the traveling joining apparatus are always on the rolling steel material pass line, both the preceding rolling steel material and the following rolling steel material are conveyed in a straight line. Therefore, as described above, it is impossible to correct the cutting end face position of the tip end portion of the subsequent rolling steel material because there is no portion for absorbing the corrected movement amount in the vicinity of the tip end portion of the following rolling steel material.

Further, there is no cushioning function against fluctuations in the rolling speed of the steel material for preceding rolling. In order to solve this, as in the strip welding method disclosed in Japanese Patent Publication No. 52-17510, Japanese Patent Publication No. 51-21603, etc., a predetermined length portion in the vicinity of the joint portion of the steel for subsequent rolling is formed into a loop. The ascending loop of the mechanism is once formed to form an ascending loop, and immediately thereafter, the loop forming mechanism is descended, and the residual loop absorbs the correction movement amount of the cutting end face position of the tip end portion of the following rolling steel material. Is known.

However, the loop forming mechanism for installing the extremely thick and super heavy grade high temperature steel material for hot rolling in the roller table arranged in the traveling path of the traveling joining apparatus for pretreatment is
Large capacity and complicated. Also, while the steel material is abutted and raised by the looper roll of the loop forming mechanism, the abutted steel material part moves while undergoing large plastic deformation, so cracks may occur, and it may be necessary to correct it with a correction device. You will have various problems.

When a rising loop is formed and immediately thereafter, the loop forming mechanism is lowered to form a residual loop,
It is necessary to control the lowering speed of the looper that causes a loop deformation allowance to the extent that the correction movement amount of the cutting end face position of the tip end portion of the backward rolling steel material can be absorbed. Because
When the loop deformation allowance that absorbs the correction movement amount is exceeded,
This is because a steep falling phenomenon occurs and damages the steel material and the looper roll. However, in reality, it is extremely difficult to consider in advance the cushioning against the fluctuation of the rolling speed of the steel for the preceding rolling and to grasp the corrected movement amount of the cutting end surface position of the tip of the steel for the following rolling in advance. The method of forming the ascending loop had to be abandoned.

[0011]

The present invention has been made in order to solve all of the problems of the prior art, and its characteristic means is the embodiment shown in FIGS. 1 and 2 which will be described later. As shown in, there are the following two points. (1) In the method of joining a plurality of plate materials and continuously hot rolling, the trailing end cutting surface of the material for preceding rolling and the leading end cutting surface of the trailing rolling plate material are run at the entrance side of the continuous hot rolling press. When running and joining by the joining device, each roller of the roller table arranged on the running path of the running joining device is installed so that it can be lowered, retracted and returned from the rolling plate material path line, and interferes when the running joining device passes forward. Each roller is sequentially withdrawn and retracted from the rolling plate material pass line, and this is maintained even after passing forward, and running while forming a hanging loop of the trailing rolled sheet material on each roller of this descending and withdrawing, A continuous hot-rolling method for a plurality of sheet materials, which comprises joining the trailing end cut surface of a rolled sheet material and the leading end cut surface of a trailing rolled sheet material and then joining them.

(2) As a running joining device, a rear end clamp device of the preceding rolled plate material and a leading end clamp device of the trailing rolled plate material can be respectively swung, and
It is installed so that it can run independently in the feeding direction and the anti-feeding direction of the rolled plate material, and it is held on the table roll and above it on the rolling plate material path line in the entry side direction of the leading end clamp device of the trailing rolled plate material. The continuous hot rolling method for a plurality of plate materials according to (1), characterized in that a traveling joining device provided with rolls is used.

[0013]

Operation and Embodiments The operation and embodiments of the present invention will be described in detail with reference to FIGS. 1 and 2. According to the present invention, as in the above-described configuration, the rollers 5A that interfere with each other when the traveling joining device 4 passes through the forward traveling are sequentially lowered and retracted from the rolling plate material pass line, and the rollers 5A are maintained after the forward traveling. On the roller 5AD, the droop loop DL of the trailing rolled plate material 2
While running gently, the trailing end cut surface 1A of the preceding rolled plate material 1 and the leading end cut surface 2A of the trailing rolled plate material 2
However, even if the correction movement amount CR is large, the fluctuation of the rolling speed of the material 1 for preceding rolling is also corrected when the cutting end face 2A position of the tip end of the trailing rolled plate material 2 at the time of the butting is corrected. Even if there is, it can be sufficiently absorbed by the twist deformation FR of the loop DL on each roller 5AD that is lowered and retracted. Further, since it is the drooping loop DL, no special supporting mechanism and control mechanism other than the roller 5AD are required, and a pinch roll PR capable of variable speed control for forming the drooping loop may be simply installed behind the traveling joining device. .

Further, since the tip end clamping device 4B of the trailing rolling material 2 can be swung, only the forward movement of the tip end clamping device 4B is continued and each cutting end face 1
Since A and 2A are abutted on the entire surface, reliable joining can be performed by the joining machine 4E such as a laser type.
The joining machine 4E joins while traveling in the material width direction. Further, in the traveling joining device 4, the rolled plate material pass line PL in the entry side direction of the leading end clamp device 4B of the trailing rolled plate material 2 is used.
Table roll 4C and press roll 4D above it
Therefore, after the traveling joining device 4 completes the joining, the table roll 4C is placed above the holding roll 4
By lowering and sandwiching D, when the loop deforming portion DL of the trailing rolled plate material 2 enters the traveling joining device 4, it is easily straightened and straightened to allow smooth entry movement and passage, and joining This is to realize smooth and safe continuous hot rolling operation by completely preventing bending, breakage, peeling and the like of a part.

[0015]

As is apparent from the above description, the present invention is
According to the above configuration, when the rear end of the material for preceding rolling and the tip of the material for subsequent rolling are joined, the position of the cutting end face of the tip of the steel for subsequent rolling at the time of butting is corrected. Even if the moving amount is large, even if the rolling speed of the steel material for preceding rolling varies, it can be sufficiently absorbed by the torsional deformation of the loop on each roller of the descending and retracting. Further, since it is a droop loop, no special support mechanism and control mechanism other than the roller are required, and a pinch roll capable of variable speed control for forming a droop loop may be simply installed behind the traveling joining device.

Further, since the clamp device for the front end portion of the material for the subsequent rolling can be swung, each cutting end face abuts only by continuing the forward movement of the front end clamp device, so that reliable joining can be achieved. Is possible.
Furthermore, when the loop deformation part of the trailing rolled plate material enters the running joining device, it can be easily straightened and straightened to allow smooth entry movement and passage. It completely prevents the smooth and safe continuous hot rolling operation.

[Brief description of drawings]

FIG. 1 is an overall cross-sectional view showing an embodiment of the method of the present invention.

FIG. 2 is an explanatory view showing a state in which the cutting end face position of the tip end portion of the traveling rolling steel material is corrected at the time of joining when joining the rear end portion of the preceding rolling material and the tip end portion of the following rolling material. Figure

[Explanation of symbols]

 1 Leading Rolling Material 1A Trailing Edge Cutting Surface 2 Trailing Rolling Material 2A Tip Cutting Surface 3 Continuous Hot Rolling Machine 4 Running Joining Device 4A Trailing End Clamping Device 4B Tip Clamping Device 4C Table Roll 4D Roll 4E Joining Machine 5 Roller Table 5A Roller 5AD Roller PL Rolling plate material pass line DL Dripping loop S Rolling material supply direction N Rolling material pressure supply direction CR Corrected movement amount FR Deformation PR Pinch roll

Claims (2)

[Claims] 1. A method for continuously hot rolling by joining a plurality of sheet materials, wherein a trailing end cutting surface of a preceding rolling sheet material and a leading end cutting surface of a trailing rolling sheet material are connected to an inlet side of a continuous hot rolling press. When traveling and joining with the traveling joining device, each roller of the roller table arranged on the traveling path of the traveling joining device is installed so that it can be lowered, retracted and returned from the rolling plate material path line, and when the traveling joining device passes forward. The interfering rollers are sequentially withdrawn and retracted from the rolling plate material pass line, and they are maintained even after passing forward, and run while forming a hanging loop of the trailing rolled plate material on each roller of this descending and withdrawing. A continuous hot-rolling method for a plurality of plate materials, which comprises joining the trailing end cut surface of the preceding rolled plate material and the leading end cut surface of the trailing rolled plate material, and then joining them. 2. A traveling joining device, in which the trailing end clamp device of the preceding rolled plate material and the leading end clamp device of the trailing rolled plate material can be respectively swung, and the rolled plate material is supplied. Direction and anti-feed direction, respectively, so that each can be run independently, and a table roll and a press roll above it are installed on the rolling plate material path line in the entry side direction of the leading end clamp device of the trailing rolling plate material. The continuous hot rolling method for a plurality of sheet materials according to claim 1, wherein a joining device is used.