JPH0357283Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Industrial Application Field) The present invention relates to a vertical roll for chamfer rolling of slabs, and in particular, the present invention is intended to improve the cross-sectional shape of the edge of the slab during forming rolling in order to improve the cross-sectional shape of the edge of the slab during rolling. The present invention relates to a vertical roll for chamfer rolling. (Prior art) In plate rolling, forming rolling is usually performed in the longitudinal direction of the slab to adjust the thickness (hereinafter simply referred to as forming rolling), and rolling is performed by turning the slab 90 degrees in a horizontal plane to give it a predetermined width. Tenter rolling performed in the width direction of the slab (hereinafter simply referred to as tenter rolling), and finish rolling performed in the longitudinal direction (hereinafter simply referred to as finish rolling) performed by turning the slab 90 degrees to obtain a predetermined thickness and length. However, depending on the rolling conditions, the slab shape shown in Figure 4a may have cross-sectional defects at the side edges in the width direction called folds, as shown in Figure 4b, and these folds may occur. Usually, the thicker the slab, the more conspicuous it becomes. In order to eliminate or improve the above folding, a thick plate rolling method is known from JP-A-59-113906, in which a conventional continuous cast slab is chamfer-rolled using a horizontal V-shaped caliber roll during forming and rolling. (Problems to be solved by the invention) When chamfering is performed at the slab stage, there are problems with handling with tongs in the middle and pushability in the pusher furnace, and furthermore, as shown in Figure 5, the planar shape after forming and rolling is disturbed. There is a problem that it is easy to cause That is, FIG. 5a shows a plan view and an elevation view of the slab with the chamfer 5 before rolling, and FIG. 5b shows a plan view of the slab after rolling the slab with the chamfer 5. Since the chamfered portion 5' has a small reduction amount, it has little elongation, and the center portion of the front and rear ends protrudes. On the other hand, when a rectangular slab is used and chamfered during forming and rolling, the above-mentioned problems are avoided, but dog bones are generated during chamfering, and the adverse effects of this are unavoidable. In particular, when the slab thickness is thick, the amount of bending is large and the amount of chamfering rolling needs to be increased, so the dog bones that occur also become larger, and the surface due to overcooling of the dog bone part and horizontal reduction of the maximum position of the dog bone during tentering rolling. Occurrence of defects becomes a problem. Furthermore, in thick plate rolling, the target slab thickness range is usually about 200 to 300 mm, so if you try to suppress dog bones by reducing the caliber angle, you will need to ensure roll strength and roll the slab surface of all target thicknesses. There is a problem in that a caliber roll applicable to take rolling has an unrealistic size. (Means for Solving the Problems) The object of the present invention is to provide a vertical roll that can eliminate and improve the drawbacks of the conventional vertical rolls for chamfer rolling of slabs. Chamfer rolling can exert the effect of suppressing dog bones on thick sections of slabs where dog bones become large, while normal chamfer rolling can be performed on slabs with a thickness that requires a small amount of chamfering. The object of the present invention is to provide a vertical roll for use, and the above object can be achieved by providing the roll described in the claims of the utility model registration. That is, the present invention is equipped with a horizontal V-shaped caliber for chamfering and rolling the side edges of the slab used during the forming rolling process during a series of slab rolling steps consisting of forming rolling, tentering rolling, and finishing rolling. In the vertical roll for slab chamfering rolling made of A chamfering caliber with a normal caliber angle θ ₁ is formed in the central region of the bottom of the V-shaped groove, and a chamfering caliber with a caliber angle θ ₂ of more than 12° to 30° is formed near both outer ends. The present invention relates to a vertical roll for slab chamfer rolling, characterized in that a caliber for suppressing dogbones is formed by bending. Next, the present invention will be explained using figures. Fig. 6 is an elevational view of a vertical roll with a caliber for performing conventional caliber rolling, in which 1 is the roll body, 2 is the material to be rolled, and 3 is the dogbone portion generated by chamfer rolling of the material to be rolled. , roll body 1
A horizontal V-shaped caliber is provided in the center of the roll, and the angle θ of the caliber with respect to a plane perpendicular to the axial direction of the roll is usually around 60°. Fig. 1 is an elevational view of a vertical roll with a caliber of the present invention, 4 is the roll body, and the horizontal V-shaped caliber provided in the central area of the caliber of the roll is viewed from a plane perpendicular to the axial direction of the roll. The angle θ becomes ₁ ,
In addition to the caliber which mainly acts on chamfering and is located at the bottom of the so-called V-groove, on both sides of it, i.e. near both outer ends, it has an angle θ ₂ with respect to the plane perpendicular to the axial direction of the roll. It _has a multi-step shape that is bent in _two stages with a caliber that mainly works to suppress dog bones. Suppresses dog bones that occur. This dogbone suppression caliber angle θ ₂ is
If it is smaller than 12°, the thrust force on the vertical roll will increase and the range of applicable slab thickness will be narrowed. On the other hand, if this dog bone suppression caliber angle θ ₂ is larger than 30°, the effect of the present invention will be fully demonstrated. Therefore, this caliber angle θ ₂ for dogbone suppression needs to be within the range of more than 12° to 30°. Next, the present invention will be explained using 1/12 lead model experimental data. Figure 2 shows a conventional vertical roll with caliber (θ=
60°), vertical roll with caliber of the present invention (θ ₁ = 60°, θ ₂
= 15°), vertical roll with caliber of the present invention (θ ₁ = 60°,
This is a diagram showing the relationship between the chamfer amount (mm) and the height of one side of the dog bone of the rolled material when lead is chamfer-rolled using θ ₂ = 30°, respectively. The lines marked with ○ or ● are the results when chamfer rolling is performed using the roll of the present invention with a two-stage caliber of θ ₂ = 15° or 30°. It can be seen that the dogbone height can be kept low by setting the caliber angle to two stages, θ ₁ and θ ₂ . Next, the present invention will be described with reference to embodiments. Example Chamfer rolling was performed using an actual caliber roll (θ ₁ =60°, θ ₂ =15°), and the results shown in the table below were obtained. The same table also shows the results of chamfer rolling using a conventional caliber roll.

[Table] Although the caliber part of the roll of the present invention used in the above example was formed in a straight line, for example, the caliber part in the third
As shown in the figure, the upper and lower end regions of the caliber can also be formed in an arcuate shape, and by doing so, the same effect as when formed in a straight line can be obtained. That is, in FIG. 3A, the angle θ ₂ of the upper and lower end regions of the caliber is 10° to 30°, similar to the angle θ ₂ of the upper and lower end regions of the caliber in FIG. 1, and the intersection with the central region of the caliber is A and the outer end point B of both upper and lower regions of the caliber are connected by a circular arc. It is advantageous to use a radius R for the curvature of the circular arc such that the center of curvature O is located at least outside the perpendicular line YY passing through the point B. Further, as shown in FIG. 3B, the vicinity of the intersection point A between the caliber center region and the ends of the upper and lower caliber regions may be shaped into a small arc, and the vicinity of the end point B of the caliber upper and lower regions may be shaped into a small arc, that is, a chamfered shape. I can do it. (Effects of the invention) By using the caliber roll of the present invention, the dog bone height caused by chamfer rolling can be kept low, and even when chamfer rolling slabs of various thicknesses, the single caliber roll of the present invention can be used. This can be done simply by using a caliber roll of 1, and can have the great effect of preventing folding without damaging the surface quality of the side edge of the rolled material.

[Brief explanation of the drawing]

Fig. 1 is a front view of the caliber roll of the present invention, Fig. 2 is a diagram showing the relationship between the chamfer amount mm and dog bone height mm (one side) when chamfer rolling is performed using the caliber roll of the present invention and the conventional caliber roll. Fig. 3a is a partial front view of a caliber roll of the present invention having an arcuate second stage caliber, Fig. 3b is a partial front view of a roll of one modification of Fig. 4a, and Fig. 4a Figure 5a is a front view of the slab, Figure b is a front view showing the folded shape of the rolled material after chamfer rolling with a conventional single-stage caliber roll, and Figure 5a is a front view showing the folded shape of the rolled material after chamfer rolling with a conventional single-stage caliber roll. Figure 5b is a plan view including the elevation of the rolled material, in which both sides of the rolled material parallel to the rolling direction of the rolled material are chamfered before rolling in order to avoid the disadvantages of the rolling material. FIG. 6 is a plan view showing a state in which a chamfer remains after rolling the material to be rolled, and FIG. 6 is a front view of a conventional chamfered caliber roll. 1, 4...roll body, 2...rolled material, 3...
...Dog bone, 5, 5'... Chamfered part.

Claims (1)

[Claims for Utility Model Registration] A horizontal V-shape for chamfer rolling the side edges of slabs used during forming rolling during a series of slab rolling steps consisting of forming rolling, tentering rolling, and finishing rolling. In a vertical roll for slab chamfer rolling equipped with a caliber: The groove shape of the horizontal V-shaped caliber attached to the outer peripheral surface of the roll is changed in two stages by changing the inclination angle with respect to a plane perpendicular to the roll axis direction. A chamfering caliber with a normal caliber angle θ ₁ is formed in the central region of the bottom of the V-shaped groove, and a chamfering caliber with a caliber angle θ ₂ of more than 12° to 30° is formed near both outer ends. A vertical roll for slab chamfer rolling, characterized in that a caliber for suppressing dog bones is formed, which is bent at an angle of .