JPS60127003A - Method and device for edging slab - Google Patents

Abstract

PURPOSE:To reduce a fish tail and to improve a yield of product by providing a circular cross-sectional part to a vertical roll of vertical mill and edging a slab by the circular cross-sectional part or the vertical roll in a state of leaving parallel parts at the front and rear ends of slab. CONSTITUTION:In edging a slab, a beam 2 is raised or lowered by hydraulic cylinders 3 to raise or lower vertical roll chocks 4, 4', a vertical roll 5, and a die 6, in one body. Next, the die 6 is positioned at a prescribed position, a driving device connected to the vertical roll-axis is braked so as to prevent the die 6 from turning, the die 6 and the vertical roll 5 are pushed in one body to the slab-width direction through the chocks 4, 4' by actuating hydraulic cylinders 7, 7', and the slab is preliminarily press-formed by the circular arcuate part of the outer circumference of die 6 while leaving parallel parts at the front and rear end-parts of slab. Thereafter the edging is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a width rolling method and an apparatus therefor capable of reducing fishtails occurring at the front and rear ends of a slab.

Conventionally, when width rolling a slab, the slab S shown in FIG. 1(A) is passed between the left and right vertical rolls of a vertical rolling mill with a predetermined gap adjusted to perform width rolling.

However, when the slab S is width-rolled, a fishtail a is formed at the front and rear ends of the slab S, as shown in FIG. This fishtail a has an adverse effect on the product yield, and increases as the number of width rolling operations and width reduction amount increase.

Therefore, in order to prevent the occurrence of fishtails, as shown in Fig. 2 (a), the front and rear corners of the slab S are preformed and pressed to form recesses with parallel parts, and then width rolled. It is proposed that. When the width of the slab S is rolled by this method, as shown in Fig. 2 (0), no fishtail occurs in the slab S, and the product yield is reduced by 1.
tIl can be increased. However, in this case, a special preforming press device is required, resulting in problems such as an increase in the length of the rolling equipment line and a rise in equipment costs. For this reason,
A mold with a flat pressing surface is rotatably provided on the outer periphery of the vertical roll, and during preform pressing, the mold is rotated and positioned at a predetermined position, and the mold presses the front and rear corners of the slab. A method of preforming and pressing has been proposed, but in this case, the stopping accuracy of the mold becomes a problem.

In view of the above-mentioned viewpoints, the present invention provides a width rolling method and an apparatus therefor, which makes it possible to preform press the leading and trailing ends of slabs without the need to provide a special preforming press device and without making stopping accuracy a problem. This was done with the purpose of doing so.

According to the present invention, a vertical roll of a vertical rolling mill is provided with a circular cross section, and the circular cross section or the vertical roll performs width rolling with a parallel portion remaining at the front and rear ends of the slab.

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

3 to 5 show an embodiment of the apparatus for carrying out the method of the present invention, in which a pair of upper and lower housings 1.1' are arranged horizontally, and a pair of left and right steps are arranged in front and behind the housing 1. Part 1a
Two sets of beams 2, which can be raised and lowered by a hydraulic cylinder 3, are fitted to the stepped portion 1a, and a vertical roll shaft box 4, which rotatably supports a vertical roll 5, is placed on the beam 2. The vertical roll axle box 4 can be slid along the beam 2 in the slab width direction, and the vertical roll axle box 4' that rotatably supports the vertical roll 5 can be moved up and down in the housing 1' and can be moved in the slab width direction. The vertical roll 5 is fitted so that it can slide into the
A molding die 6 having a circular cross section is fixed on the same axis as the housing 1, and fluid pressure cylinders 1 for rolling down are installed on both sides of the housing 1゜1'.
7' is installed.

When width rolling a slab, the beam 2 is raised or lowered by the hydraulic cylinder 3 and the vertical roll shaft box 4.
', the vertical roll 5 and the mold 6 are raised or lowered together, the mold 6 is positioned at a predetermined position, and the drive device connected to the vertical roll shaft is braked so that the mold 6 does not rotate;
The vertical roll shaft box 4 is activated by operating the fluid pressure cylinder 7.7'.
The mold 6 is pushed integrally with the vertical roll 5 in the slab width direction via ゜4', and the arc-shaped part on the outer periphery of the mold 6 is used to
As shown in a), preforming is performed leaving parallel portions at the leading and trailing ends of the slab S, followed by width rolling.

According to the results of a lead plate model test, the position where the preforming press is performed is L-0, 10 to 0, where the plate width is W1 and the distance from the tip or rear end of the slab to the center of the mold 6 is L.
．． Good results were obtained in the range of 40 W, especially when L=0.17 W, and as shown in FIG. 6 (b), the occurrence of fishtail a after rolling was slight.

In addition, in the embodiment of the present invention, a case where a mold is provided and the preforming press is performed using the mold is explained, but it is also possible to perform the preforming press using a vertical roll, and the mold has an arcuate shape instead of a circular cross section. However, there are other things that can be done,
It goes without saying that various changes may be made without departing from the spirit of the invention.

According to the width rolling method and its device of the present invention, preforming of the front and rear ends of the slab is performed at a predetermined position by the vertical roll or the outer circumferential arc portion of the mold provided coaxially with the vertical roll. Various excellent effects can be achieved, such as the reduction of tails, which improves the yield of finished products, and the elimination of the need for special press equipment, which reduces equipment costs.

[Brief explanation of drawings]

Figure 1 (a) and (b) are explanatory diagrams of fishtails that occur when a slab is width-rolled without preforming press, and Figures 2 (a) and (b) are special preforming press equipment on the rolling line. Fig. 3 is an explanatory drawing of an embodiment of the present invention, Fig. 4 is a view taken in the direction IV-IV of FIG. 3, FIG. 5 is a perspective view of the housing used in the present invention, and FIG.
B) is an explanatory diagram of fishtails that occur when preform pressing and width rolling are performed according to the present invention. In the figure, 1.1' is a housing, 2 is a beam, 3 is a hydraulic cylinder, 5 is a vertical roll, 6 is a mold, and 7.7' is a hydraulic cylinder. Figure 1 Figure 2 Figure 5 Figure 0 Figure 6 (A) (B)

Claims (1)

[Scope of Claims] 1) A vertical roll for width rolling or an arc-shaped part of a mold provided on the vertical roll part is used to roll the front and rear ends of the slab by leaving a parallel part of a required length at the front and rear ends of the slab. A width rolling method characterized by performing preform pressing. 2) A width rolling device comprising: a mold having an arcuate portion provided in a vertical roll portion for width rolling; and a device for raising and lowering the vertical roll and the mold integrally.