JPS6284803A - Slab width reduction method using a press - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for reducing the width of a slab using a press, which enables strong width reduction to be performed without buckling the slab.

[Conventional technology] Conventionally, slab width reduction was performed using a vertical rolling mill.

However, in the case of a vertical rolling mill, the amount of width reduction that can be achieved in one pass is not so large, so several buses are required to reduce the width to a predetermined amount, resulting in a problem of poor work efficiency.

For this reason, in recent years, it has been considered to perform strong width reduction of slabs using a press that can increase the width reduction (1) in one time, thereby improving production efficiency.

[Problems to be Solved by the Invention] However, when performing strong width reduction using the above-mentioned press, buckling occurs in the slab at the front and rear ends where only one of the front and rear tensions is applied, and the subsequent process There was a problem that it was difficult to process slabs.

In view of the above circumstances, the present invention aims to prevent buckling from occurring at the front and rear ends of the slab even if severe width reduction is performed.

Means for Solving Problems] The present invention is to reduce the width of the slab at least one of the front and rear ends of the slab by making the feed rim smaller than the width of the reduction of the mold.

[Function] Therefore, at the front and rear ends of the slab, the feed amount is made smaller than the rolling width of the mold, so the width rolling edge during rolling acting in the plate width direction becomes smaller.

[Example] Hereinafter, the present invention will be described in detail based on the drawings.

Figure 1 shows the width reduction of the slab 2 by the dies 1 and 1 of the width press. The stationary part between (c)
2 shows a state in which the rear end portions are being rolled down in width.

In the present invention, as shown in FIGS. 1(A) and 1(C), the mold 1
When the rolling width of the slab 2 is Ll, width rolling is performed by setting the feed amount of the slab 2 to L2 which is smaller than Ll at least at one of the leading and trailing ends. Width reduction is performed by setting the feeding head to L3, which is approximately equal to Ll.

In the above, since longitudinal tension is acting on the slab 2 in the steady portion of the slab 2, the slab 2 is unlikely to buckle. Therefore, width reduction can be performed with L1=13. On the other hand, there is no (or small) forward tension at the tip of slab 2.
, since there is no (or small) rear tension at the rear end of the slab 2, the slab 2 is prone to buckling. Therefore, by performing the width reduction with Ll > 12 at the front and rear ends, the stress acting in the width direction of the plate during reduction can be reduced, and buckling can be prevented. Of course, the feed amount L2 is the slab 2
The appropriate selection is made depending on the material, plate thickness, etc.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effects of the Invention] As explained above, according to the slab width reduction method using a press of the present invention, the front and rear ends of the slab are reduced in width by a feed amount that is smaller than the reduction width of the mold, so that strong width reduction is possible. Even if this is done, the stress acting in the width direction of the plate can be made smaller than that in the steady portion, and buckling can be prevented, which is an excellent effect.

[Brief explanation of drawings]

Figure 1 shows the method of reducing the slab width using the press of the present invention, (a) shows the tip, (b) shows the steady part, and (c)
FIG. 2 is an explanatory diagram showing a state in which the width of the rear end portions is being lowered. 1 indicates a mold, and 2 indicates a slab.

Claims (1)

[Claims] 1) A slab width reduction method using a press, characterized in that at least one of the front and rear ends of the slab is reduced in width by a feed amount smaller than the reduction width of a mold.