JPS61162206A - Edge-rolling method of sheet stock - Google Patents

Abstract

PURPOSE:To improve the width accuracy and yield of a rolling stock by slanting a vertical roll to the advancing direction of the stock in performing rolling. CONSTITUTION:Freely-rotatable vertical rolls 11 are provided to the housing 10 of a mill through roll chocks 12 as well as a slanting device 13 is provided. In the device 13, trunnion cylinders are set beneath the lower ends of both sides of the housing 10 to turn the housing 10 by extending a rod of one side of the cylinder and contracting a rod of the other side at the same time. A rolling stock S is rolled by slanting the vertical rolls 11 to the advancing direction of stock S in accordance with the advancing direction of stock S. By this method, a pressing force in the downward direction of roll 11 acts on the stock S to prevent the floating phenomenon of one or both sides of stock S. Accordingly, because the width-adjusting rolling reduction is sufficiently performed, the width accuracy of stock S is improved, and the yield of stock S is also improved by reducing cut-off parts.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention (J1 thick plate rolling process, rough rolling process of hot strip rolling, blooming rolling process, etc.) The present invention relates to an edger rolling method for plate materials.

(Prior art) For example, in the rough rolling step in hot strip rolling, the rolled material is rolled to a thickness that can be rolled in a subsequent continuous finishing mill, and then width adjustment rolling is performed to obtain a predetermined product width. will be held. In this width adjustment rolling, that is, edger rolling, a vertical scale breaker (
VSB) Alternatively, when width adjustment rolling is performed using a pair of cylindrical vertical rolls as an etching roller, if a rolling blade is applied to the rolled material, one side of the rolled material in contact with the vertical rolls often floats. There are two things. For this reason, it is not possible to perform sufficient width reduction, resulting in a decrease in width dimension accuracy, and also, due to floating, a step is formed on the side end surface of the rolled material, resulting in a decrease in the surface angle. This will eventually lead to a decrease in yield. In particular, if this one-sided lifting phenomenon occurs in the medium reduction pass, and the lifting direction is different for each pass and appears alternately on the working side and the driving side, the width dimensional accuracy of the rolled material will gradually decrease, and the side edge This will encourage deterioration of the shape. These phenomena also appear in the thick plate rolling process or edger rolling in the blooming process.

For this reason, various edger rolling methods have been proposed. As a first method, a tapered roll whose diameter expands to one side is used as a vertical roll, or a cylindrical vertical roll is arranged with an inclination n+ in the width direction. No. 16259), there is an attempt to prevent buckling or one-sided lifting by generating a pressing force to seal the rolled material during rolling. Also, the second method and 11. In some cases, a presser [7-ru] is attached to suppress the central part of the rolled material. Furthermore, as a third method,
It has been proposed to roll using caliber rolls as vertical rolls (Japanese Patent Publication No. 7322/1983).

(Problems to be Solved by the Invention) However, in the first method, it is not possible to completely prevent (J one side lifting).

Due to the taper of the vertical roll or the inclination of the vertical roll in the width direction, the surface angle of the side end face of the rolled material is reduced.

Further, although the second method can be expected to be effective in preventing buckling and one side lifting, the rolling equipment becomes complicated and maintenance is difficult. And then to the rolled material.”
If double warpage occurs, the rolled material will collide with the presser rolls, which will not only cause damage to the equipment but also impede smooth operations. Furthermore, the third method is originally aimed at significantly reducing the rolled material to reduce biting defects and slippage, and when the thickness of the material becomes thinner than the caliber dimension, one side may float. This method has the disadvantage that it cannot prevent the flashing phenomenon.

As described above, it can be said that the various conventional etsunya rolling methods are extremely insufficient in solving the buckling phenomenon and the one-sided lifting phenomenon. Answer: The current situation is that we cannot find a concrete solution.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a method of edger rolling a plate material, which can suppress the phenomenon of one side lifting in a reversible rolling mill and can achieve a large reduction. With the goal.

Therefore, the inventors of the present invention conducted various analyzes of the phenomenon caused by edger rolling (one-sided lifting of rolled material) and conducted repeated experiments using a plasticine model using an experimental rolling mill.As a result, the edger rolling The phenomenon of lifting of one side of the rolled material during rolling is caused by (1) non-uniformity of the shape of the side edges of the rolled material, and (2) rolling due to the inclination in the width direction of the table roller that conveys the rolled material. The slope in the width direction of the material (
3) It was found that the main cause was the inclination of the vertical rolls of the Etsunya rolling mill.

Among the above factors, factors (2) and (3) can eliminate the phenomenon of thickening on one side of the rolled material caused by improving the rolling equipment. However, regarding (1), which is caused by the shape of the rolled material, it is necessary to fully understand the behavior of the rolled material caused by the shape of the side edges during rolling.

The shape of the side edge is as shown in Figures 2 to 4.
(a) The rectangularity of the cross-sectional shape of the rolled material (slab) is deformed (Fig. 2), (b) The bulge formed in the thickness adjustment rolling (horizontal pass) is unbalanced (Fig. 3).
(Fig. 4), or (C) A part of the rolled material whose corners are symmetrically deformed (rolled) (Fig. 4). In this case, the width reduction causes rolling -4 = material flow due to plastic deformation of the rolled material. The thickness direction component of this material flow rate is determined by the thickness direction component of the material flowing from the vertical roll to the rolled material. The reaction of the material flow applied to the part A becomes larger, and the reaction of the 'tA flow to the parts A and B acts as a couple to rotate the rolled material, resulting in rotation of the rolled material in the direction of the arrow in the figure. ,
In other words, one side of the rolled material will be lifted up.

(Means for Solving the Problems) In order to solve the above problems, the present invention, based on the above findings, uses a reversible width reduction stand having a pair of vertical rolls to alternately reverse the traveling direction of the rolled material. In the edger rolling method for rolling a plate material to a required width, the vertical rolls in the width reduction stand are inclined in the direction of progress of the rolled material to perform rolling.

That is, in the present invention, as shown in FIG. 1, by tilting the vertical roll 11 at an appropriate angle θ in the direction of movement in a vertical plane parallel to the direction of movement of the rolled material, the side edges of the rolled material S can be adjusted. Because the vertical rolls 11 are arranged at an angle with respect to the edges, the vertical component of the motion vector in the rotational direction of the vertical rolls 11 pushes the side edges of the rolled material S in a downward direction (
By applying the force f and pressing the rolled J' S downward, it is possible to prevent the phenomenon of one side or both sides floating.
L? ! I can do that.

Further, during reversible rolling, the traveling direction of the rolled material may be, for example, the first
When changing from the left side to the right side of the rolling mill in the figure, the inclination direction of the vertical roll may be tilted at an appropriate angle θ in the direction opposite to that in Figure 1 (3°) (Example ) Next, the present invention will be explained using a reversible vertical rolling mill shown in 1. in FIG. 4 as an example.
Vertical rollers 1 and 11, which are reversibly rotatably supported by shafts 2 and 2, are mounted so that they can move forward and backward in the width direction of the rolled material S by a rolling mechanism similar to that of a conventional vertical rolling mill, although their illustration is omitted. This rolling mill housing 10 is tilted by a tilting device 1 so that the axis of the vertical roll 11 is tilted at an appropriate angle of 0 () in the traveling direction of the rolling material S in a vertical plane parallel to the traveling direction of the rolled material S.
3 is provided. That is, in the case of the illustrated example, trunnion cylinders 13a and 13b are installed as the tilting devices at the lower ends of both sides of the housing. The rod of the cylinder 13a located on the advancing side is extended in accordance with the advancing direction of the rolled material, and at the same time, the rod on the opposite side to the advancing direction is contracted. The cylinder 13a is tilted twice.When the direction of movement of the rolled material is reversed, the lot of the cylinder 13b is simultaneously shortened and at the same time the cylinder 13a is extended and tilted to the opposite side by an appropriate angle -θ. be.

Using the above vertical rolling mill, the vertical rolls are tilted at an appropriate angle in the traveling direction of the rolled material according to the traveling direction of the rolled material.
By performing the width reduction, one-sided lifting can be prevented and stable width adjustment rolling can be performed.

(Effects of the Invention) As is clear from the explanation below, according to the temporary phase eno-sawyer rolling method of the present invention, the phenomenon of one side of the rolled material being lifted does not occur, so the width adjustment reduction can be carried out sufficiently. This improves width accuracy and minimizes the amount of edge cut-off after rolling, which improves product yield.
It has the following effects.

[Brief explanation of drawings]

Figures 1a and 1b are schematic explanatory diagrams showing the edger rolling method of the present invention, Figure 2 is an explanatory diagram showing the conventional edger rolling state, and Figures 3 to 5 show the cross-sectional shape of the rolled material. The cross-sectional views shown in FIGS. 6 and 7 are explanatory diagrams showing the principle of hedging and rolling. 10...Housing, 1 frame, +5...Vertical roll, 16 Jock 119 Cylinder 120 Piston. Patent/Permit Applicant Kobe Steel Co., Ltd. Agent Patent Attorney Mr. Maeda and 2 others Figure 2 Figure 6 Procedural Amendment (Voluntary) February 19, 1985 Patent Application No. 3779 2 Title of the invention: Nijijar rolling method for plate materials 3 Relationship with the case of the person making the amendment Patent applicant 4 Representative (1) Drawings (all drawings) 7. Contents of the amendment (1) Drawings clearly drawn in fruit production ( (no change in content). More than = 2-

Claims (1)

[Claims] (1) In an edger rolling method for plate materials, in which a reversible width reduction stand having a pair of vertical rolls is used to roll a rolled material to a required width while alternately reversing its direction of progress, the vertical rolls in the width reduction stand are used to roll the rolled material to a desired width. A method for edger rolling a plate material, characterized in that rolling is performed at an angle in the direction of travel.