JPH0342121B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an edger rolling method for rolling a rolled material from the width direction, and particularly relates to an edger rolling method that performs a large reduction.

[Conventional technology]

BACKGROUND ART In plate hot rolling, etc., plate materials of various width dimensions are manufactured, and during the manufacturing, width adjustment rolling, that is, edger rolling is performed in order to obtain a desired product width. However, if the width reduction amount, which is the rolling amount in the width direction, is too large during this edger rolling, as shown in FIG. When subjected to force, it curves upward like S', and in extreme cases, buckling occurs, so the amount of width reduction has been limited. For example, when hot rolling a continuously cast slab, the width reduction during rough rolling is at most 50 to 1/2 of the plate thickness.
The width reduction remained at around 60 mm, and it was desired to increase the width reduction in order to improve the operating rate of continuous casting equipment.

Therefore, in order to prevent such buckling, the applicant proposed in Japanese Patent Application Laid-Open No. 60-76203 that the axes of a pair of vertical rolls are made such that their upper parts are inclined in the direction opposite to the direction of movement of the rolled material, and that they are bent downward. An edger rolling method has been proposed in which the central part of the rolled material is supported by a table roller between the pair of vertical rolls and the rolled material is rolled to a required width. The operating principle of this rolling method will be explained with reference to FIGS. 4 and 5. In advance, the upper part of the axis of a pair of vertical rolls 1 having smooth surfaces is rolled with a rolled material S.
It is tilted at an appropriate angle θ° with respect to the vertical line so that it faces in the direction opposite to the advancing direction (from left to right in FIG. 4) (toward the entrance side of the rolled material). When the rolled material S is bitten by the vertical roll 1 in this inclined state, the rolled material S
is rolled down in the width direction under the rolling force F of the vertical roll 1. At this time, a vertical roll 1 is attached to the end of the rolled material S.
An upward component fR of the frictional force f generated between and the rolled material S acts. Therefore, a moment acts on the rolled material S due to the resultant force of the force fR and the rolling force F, which causes the rolled material S to curve downward in the width direction. As shown in FIG. 5, the rolled material S tries to curve downward, but since it is supported by the table roller 2, the curved deformation is restrained to a certain extent and does not progress any further. As a result, the rolled material S can be significantly reduced without buckling.

[Problem to be solved by the invention]

The rolling method explained in the conventional technology is effective for large reductions, but as the reduction amount increases, a buckling phenomenon occurs in which the middle part of the rolled material on the table roller bends upward, which limits the amount of large reductions. There was a problem that there was. That is, as shown in FIG. 5, as the rolling material S is further significantly reduced, deformation of the central portion of the rolled material S is restrained by the table rollers 2 and the material gradually becomes flat. When this flat part exceeds a certain width, buckling occurs in this part, the central part rises, and the rolled material S deforms into a W shape. Further rolling down causes the rolled material S to curve upward over the entire width, making width reduction impossible.

The present invention has been made in view of the above-mentioned problems of the conventional technology, and its purpose is to provide an edger rolling method that enables a larger reduction.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention makes the axes of a pair of vertical rolls in such a state that the upper part thereof is inclined in the direction opposite to the traveling direction of the rolled material, and the center part of the rolled material which is curved and deformed downward is tilted in the vertical direction. In the edger rolling method in which the rolled material is rolled to a required width by being supported by table rollers between the rolls, an inclined part whose diameter increases is provided on the lower side of the vertical roll, and the upper end of the inclined part is made higher than the upper surface of the table roller, Both ends of the rolled material were slightly raised, and the rolled material was bitten by the vertical rolls to cause downward deformation.

[Function] By providing a diameter-expanding inclined part on the lower side of the vertical roll, making the upper end of the inclined part higher than the upper surface of the table roller, and raising both ends of the rolled material slightly, the lower surface of the rolled material and A gap is generated between the table roller and the upper surface, which facilitates the downward convex deformation of the rolled material, making it difficult for upward buckling to occur, allowing for even greater rolling reduction. Furthermore, if the table roller on the exit side of the vertical roll is lower than the table roller on the input side or inclined downward, the amount of width reduction can be further increased.

〔Example〕

Next, an embodiment of the present invention will be described based on FIGS. 1 and 2. The difference from those described in FIGS. 4 to 6 is that both ends of the rolled material are slightly raised relative to the table rollers, and the rolled material is bitten by the vertical rolls.

Therefore, as shown in FIGS. 1 and 2, an enlarged diameter portion 4 is formed continuously and integrally with an inclined portion 5 on the lower side of the vertical roll 3, and the lower end of the inclined portion 5 is connected to the rolled material S. The vertical roll 3 is positioned at the same level as the pass line or below it, and the upper end of the inclined part 5 is higher than the upper surface of the table roller 2. As a result, the downward convex deformation of the rolled material S is facilitated by the gap between the lower surface of the rolled material S and the upper surface of the table roller, and further significant reduction is possible without buckling.

The present inventors conducted an experimental model using hot steel under the following conditions, and confirmed the specific effect on buckling of rolled material.

Rolling conditions Vertical roll shape Flat roll, roll with a bottom enlarged diameter part (distance between the top surface of the table roller and the top of the inclined part 15mm) Vertical roll diameter 100mmφ Vertical roll surface Knurling processing Rolled material size Plate thickness 9mm, plate width 200mm, plate flow
500mm Reduction amount 5mm, 10mm, 15mm, 20mm, 25mm Vertical roll inclination angle 5° on the entry side Rolling material Continuously cast killed steel Rolling temperature 880℃ Rolling speed 20m/min The results under the above rolling conditions are shown in Figure 3. show. In the case of a flat roll, when the reduction amount is 5 mm or 10 mm,
No buckling occurred up to the tail end of the rolled material. However, when the reduction amount was 15 mm to 25 mm, buckling did not occur from the tip to the vicinity of the center of the rolled material, but buckling occurred thereafter. On the other hand, when using a roll with an enlarged diameter section at the bottom, the reduction amount is 5 mm, 10 mm, 15 mm, 20 mm.
No buckling occurred in either mm or 25 mm.

By the way, in this embodiment, the table rollers are horizontal, but by making the table rollers on the exit side of the vertical rolls lower than the table rollers on the entry side or tilting downward, It is also possible to increase the amount of width reduction.

〔Effect of the invention〕

As is clear from the above explanation, by raising both ends of the rolled material slightly relative to the table roller, a gap is created between the bottom surface of the rolled material and the top surface of the table roller, and the rolled material The downward convex deformation of the material is facilitated, and upward buckling is less likely to occur, allowing for even greater reduction, so the buckling limit width reduction amount is significantly increased. In other words, it is possible to achieve a large reduction that exceeds conventional wisdom, and it also enables stable edger rolling, as well as improving the width accuracy of the rolled material, which has the effect of improving product yield. There is.

[Brief explanation of drawings]

Fig. 1 is a side view showing the state of rolling by an edger rolling mill to which the method according to the present invention is applied, Fig. 2 is a front view seen from the entry side of Fig. 1, and Fig. 3 is a width of the method according to the present invention. Figure 4 shows the results of an experiment to confirm the rolling effect, Figure 4 is a side view explaining the rolling state of the conventional method, Figure 5 is a front view as seen from the entrance side of Figure 4, and Figure 6 is buckling. FIG. 3 is a perspective view showing the raised state. 2...Table roller, 3...Vertical roll, 4...
... Expanded diameter part, 5... Inclined part.

Claims (1)

[Scope of Claims] 1. The axes of a pair of vertical rolls are made such that the upper part thereof is inclined in the opposite direction of movement of the rolled material, and the central part of the rolled material that is curved and deformed downward is moved by a table roller between the vertical rolls. In the edger rolling method in which the rolled material is supported by and rolled to a required width, an inclined part that expands in diameter is provided on the lower side of the vertical roll,
An edger rolling method characterized in that the upper end of the inclined part is higher than the upper surface of the table roller, both ends of the rolled material are slightly raised, and the rolled material is bitten by the vertical rolls to cause downward deformation. . 2. The edger rolling method according to claim 1, wherein the table roller on the exit side with respect to the vertical roll is lower than or inclined downward than the table roller on the input side.