JPS6152906A - Rolling equipment - Google Patents

Abstract

PURPOSE:To stabilize taking up of sheet bar by providing a coil box in entrance side of a finishing rolling mill and providing a shear that cuts the sheet bar in entrance side of the coil box. CONSTITUTION:A drum shear 2, a coil box 3 and a scale breaker 4 are provided successively along a pass line between a finishing rolling mill 5 and a roughing mill 1. The fish tail at the tip of the sheet bar (s) came out from the roughing mill 1 is cut off by the shear 2 before entering the coil box 3. Then, the sheet bar (s) is taken up by the coil box to form a coil 6 and led to the finishing rolling mill 5. By this method, the sheet bar (s) is taken up exactly by the coil box 3 irrespective of the size of the fish tail even when the width rolling reduction of the roughing mill increases. Accordingly, the taking-up of the coil is performed stably.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an improvement in rolling die 1;h for hot rolling a steel strip.

[Conventional technology]

Normally, when rolling steel strip, a slab is roughly rolled into a sheet bar.
This is then done step by step in the order of finishing rolling to form a steel strip. When /If rolling is performed in this manner, there is a difference between the rough rolling speed and the finish rolling speed, and a temperature drop occurs at the rear end of the sheet bar on the table while waiting for the finish rolling.

This temperature drop causes temperature non-uniformity in the longitudinal direction of the sheet bar, which has an adverse effect on the product.

As a countermeasure against this problem, rolling equipment is already known in which a coil box, which is a coiler without a mandrel, is installed between a rough rolling mill and a finishing rolling mill (Special Publication No. 50-3002).
8, Special Publication No. 52-45304). FIG. 3 shows an example of this, in which the sheet bar S coming out of the rough rolling mill 1 is wound up at the winding point A of the coil box 3 to form a coil 6 having an air core, and the coil 6 is The sheet bar S is advanced toward the finish rolling mill 5, and while the sheet bar S is progressing, the coil 6 at the winding point A is transferred to the unwinding point F/i B by a transfer device (not shown). ). The winding location is immediately prepared for winding the next sheet bar S.

With this configuration, the sheet bar is once wound into a coil, so one of the sheet bars and doper can be rolled while waiting for finishing rolling.
The quality is hard to deteriorate.

Therefore, the above-mentioned temperature drop problem caused by the difference in rolling speed can be solved. In the figure, 2 is a drum shear that trims the ends of the unwound sheet bar, and 4 is a pinch roll scale that removes the anti-resistance scale from the surface of the sheet bar. It's a breaker.

[Problem that the invention seeks to solve]

However, in recent years, there has been a tendency to increase the amount of width reduction in the rough rolling mill, and the following problems are currently occurring.If the width reduction measures are increased in the 4-phase IE rolling mill 1, as shown in Figure 2. As shown above, a fishtail S' occurs at the tip of the sheet bar S, but as described above, rough rolling 4! S! 1, Co-rubbox 3,
In the 414 configuration in which the drum shear 2 and the finishing mill 5 are arranged in this order, the fishtail S' cannot be cut by the hand + rIj of the coil box 3, so the inner winding of the coil cannot be wound properly due to the fishtail S'. 6 tends to become distorted, and there is a problem that winding becomes impossible in some cases. Especially the thickness of the seat bar is 20mm1'
After iT, there were many thin fabrics with fishtail (sha), and -
This tendency is strong due to the lack of firmness in spring.The present invention was made to solve this problem.

[Means for Solving the Problems] In order to solve the above-mentioned problems in rolling equipment in which a coil box is provided between a rough rolling mill and a finishing rolling mill, the present invention has the following features:
A shield is provided on the inlet side of the coil box.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a rough rolling mill 1, a drum shear 2, a coil box 3, a pinch roll scale breaker 4, and a finishing mill m5 are arranged in the above order on a pass line.

Since the drum shear 2 was moved from the outlet side to the inlet side of the coil box 3 in this way, the sheet bar S coming out of the rough rolling mill 1
When guiding the coil to the coil box 3 and winding it to form the coil 6, the fishtail S of the sheet bar
' can be cut by the drum shear 2, so the sheet bar S can be wound accurately.

Please note that the coil box is limited to those listed above.
Of course, it is possible to use a structure in which the winding device is rewound to the end at the winding point instead of being rolled back, and various changes can be made without departing from the gist of the efficiency invention.

〔Effect of the invention〕

As mentioned above, according to the present invention, the irregular portions of the sheet bar are cut on the entry side of the coil box, so even if the width reduction amount in the roughing mill increases, the sheet bar will not be cut off regardless of the size of the fishtail. The excellent effect of being able to wind accurately and stably can be achieved. In addition, since no shaft is placed between the coil box and the finishing mill, the distance between the coil box and the finishing mill is shortened, which also has the effect of reducing the temperature drop of the sheet bar after leaving the coil box. .

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of the present invention, Fig. 2 is a plan view of the sheet par tip, and Fig. 3 is a conventional rolling mill.
FIG. 1 is a reciprocal Jffi41.2 is a drum shaft, 3 is a coil box, 5 is a finishing rolling machine, 6 is a coil, and S is a sheet bar.

Claims (1)

[Claims] 1) A rolling equipment characterized in that a coil box is provided on the entry side of a finishing rolling mill, and a shear for cutting sheet bars is provided on the entry side of the coil box.