JPH0255122B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a continuous hot rolling equipment train for steel plates, in particular,
The present invention relates to a rough rolling equipment train of a hot strip mill, and in particular to a continuous hot rolling equipment train capable of a large rolling reduction.

[Conventional technology]

In hot strip rolling, plates of various widths are manufactured, and in order to obtain the desired product width, width adjustment rolling, ie edger rolling, is performed in the rough rolling equipment row.

The types of rough rolling equipment rows used in hot strip rolling are (1) semi-continuous, (2) fully continuous, and (3) three-quarters. During width adjustment rolling, as shown in FIG. 1, when the rolled material S is subjected to a rolling force F by a pair of vertical rolls 1, the rolled material S undergoes upward curving deformation and only the edge portions of the rolled material are rolled down. If the deformation is not uniform in the width direction of the rolled material S, and if the above-mentioned upward curvature occurs excessively, the buckling phenomenon of the rolled material S called so-called buckling will make width adjustment rolling impossible. Conventionally, the width adjustment reduction in hot strip rolling has been considered to be at most 50 to 60 mm, which is 1/2 or less of the plate thickness.

[Problem to be solved by the invention]

Incidentally, in recent years, the ratio of continuous casting has increased from the viewpoint of emphasizing economic efficiency, and furthermore, by performing hot charge rolling or hot strip rolling by direct rolling using this continuous casting slab, continuous casting has become possible. Various attempts have been made to achieve greater energy savings and higher productivity by making the equipment and each process of hot strip rolling continuous. In the type of rough rolling equipment row, especially when a fully continuous system is adopted, the width reduction pass is limited, which causes a reduction in product yield.
In addition, in order to accurately roll the product width by reliably performing edger rolling in the latter stage of the three-quarter method, it is necessary to prepare continuous casting slabs with various dimensions that match the product dimensions. In order to manufacture slabs,
This results in a reduction in the operating rate of the continuous casting equipment, and also impedes the continuity of the above-mentioned continuous casting and hot strip rolling processes.

If an edger rolling method that allows a large width reduction amount to be used in the rough rolling of hot strip rolling becomes possible, the width adjustment reduction can be made sufficiently in the rough rolling row, so that the slab dimensions, that is, the continuous casting equipment mentioned above, can be improved. It is now possible to consolidate the width dimensions of slabs into a representative one, improving the operation rate of continuous casting equipment by reducing the preparation time for changing molds due to width dimension changes, and further improving the continuous casting process. It becomes possible to make the hot strip rolling process continuous. Specifically, it is an object of the present invention to provide a rough rolling equipment train for hot strip rolling, particularly a continuous hot rolling equipment train applied to the latter stage of a fully continuous system or a three-quarter system.

[Means to solve the problem]

In order to achieve the above object, the continuous hot rolling equipment row in the present invention is a continuous hot rolling equipment in which a vertical rolling mill and a horizontal rolling mill are sequentially arranged, and the continuous hot rolling equipment reduces the thickness while reducing the width of the plate material. In the rolling mill, the upper axes of the pair of vertical rolls of the vertical rolling mill are arranged so as to be inclined in the direction opposite to the traveling direction of the rolled material, and a table roller is arranged between the pair of the vertical rolls.

[Effect]

By arranging the vertical roll axis at an angle in the direction opposite to the traveling direction of the rolled material to cause downward curving deformation in the rolled material, and by arranging a roller table between a pair of vertical rolls to limit this curving deformation. Therefore, it becomes possible to increase the amount of width adjustment.

〔Example〕

The present invention will be described below based on the illustrated embodiment. FIG. 2 shows the arrangement of a fully continuous type hot strip rolling mill, including a scale breaker SB, continuous rolling type rough rolling mill rows R ₁ to _{R 5} . Continuous finishing rolling units F ₁ -F _o are arranged following the rough rolling units R ₁ -R ₅ . Rough rolling equipment R ₂ to R 2 in the rough rolling equipment rows R ₁ to R ₅
R ₅ is equipped with a vertical rolling mill that performs width adjustment reduction of rolled material.
V ₁ to _{V 4} are arranged such that the upper part of the roll axis is inclined at an appropriate angle θ in a direction opposite to the direction in which the rolled material travels. In addition, Figure 3 shows the arrangement of a hot strip rolling machine using the three-quarter method, with a vertical scale breaker VSB,
Rough rolling device R ₁ that rolls reversibly or in one direction, reversible quadruple rolling device R ₂ , quadruple rolling device that rolls in one direction
A rough rolling equipment row consisting of R ₂ and R ₄ is arranged, continuous finishing rolling equipments F ₁ to _{F o} are arranged following this rough rolling equipment row R ₁ to _{R 4} , and this rough rolling equipment row R ₁ to _R4
Each rolling device is equipped with vertical rolling mills V ₅ to V ₉ that perform width adjustment reduction of the rolled material. _R2 ,
The vertical rolling mills V ₄ and V ₅ for R ₄ are described above, and are arranged so that the upper part of the roll axis is inclined at an appropriate angle θ in a direction opposite to the direction in which the rolled material travels.

Now, to explain the outline of this vertical rolling mill using _V3 as an example, as shown in FIG. Although omitted, the rolling mill housing 10 is mounted so that it can move forward and backward in the width direction of the rolled material S using a rolling mechanism similar to that of a conventional vertical rolling mill. It is mounted on a pedestal 13 so as to be inclined at an appropriate angle θ in the direction opposite to the direction of travel, and a table roller 14 is rotatably provided below the pass line between the pair of vertical rolls 11. Vertical rolling mills V ₁ to _{V 4} in which the vertical rolls are arranged at an angle,
The width adjusting reduction at V ₈ and V ₉ is performed by rolling the axis of a pair of vertical rolls 1 with smooth surfaces in advance, as shown in FIGS. 4 to 6 schematically showing the principle of the edger rolling method. The material S is tilted at an appropriate angle θ in the direction opposite to the advancing direction (indicated by an arrow in the figure) (the entrance side of the rolled material), and the rolled material S is bitten by the vertical roll 1 in this inclined state. The rolled material S bitten by the vertical roll 1 is rolled down in the width direction to receive the rolling load F of the vertical roll 1, but at this time, the vertical roll 1 is arranged obliquely with respect to the edge of the rolled material S. Since the force f, which is the vertical component of the motion vector in the rotational direction of the vertical roll 1, acts in an upward direction on the edge of the rolled material S, the edge of the rolled material S is deformed upward. , Furthermore, the rolling load F on the rolled material S caused by the deformation of this edge portion
The bending moment caused by the movement of the point of action causes a downward curved deformation. This downward curved deformation of the rolled material S collides with the table rollers 2 disposed between the vertical rolls 1 and is supported by a reaction force, and the rolled material S due to the rolling load F during width adjustment rolling. In other words, by regulating the downward curving deformation of the rolled material S and balancing that deformation with the table rollers, the formation of buckling can be used as a means of suppressing it, resulting in a large It is used for rolling down.

〔Effect of the invention〕

As is clear from the above, according to the present invention, the vertical rolling mills in the continuous hot rolling equipment row are arranged with their vertical roll axes inclined in the direction opposite to the traveling direction of the rolled material, and between the pair of vertical rolls. By arranging the roller table, it is possible to increase the amount of width adjustment by preventing the buckling phenomenon (buckling) of the rolled material, and it is possible to reduce the width adjustment rolling pass of the rolled material. This prevents the temperature drop of the rolled material and improves the width accuracy, which improves the productivity of the equipment. Also, by reducing the number of passes, it is possible to reduce the number of stands in a vertical rolling mill. This not only makes it possible to consolidate slab dimensions in the continuous casting process in the upstream process of rolling, thereby improving the productivity of the equipment, but also making it possible to directly roll continuously cast slabs. The effect it produces is extremely great.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a conventional edger rolling state, FIGS. 2 and 3 are continuous hot rolling equipment rows according to the present invention, and FIG. 4 is an explanatory diagram showing the schematic configuration of a vertical rolling mill. 5 to 7 are explanatory diagrams showing the principle of edger rolling. 10... Rolling mill housing, 11... Vertical roll, 12... Bearing box, 13... Frame, 14... Table roller.

Claims (1)

[Claims] 1 A vertical rolling mill and a horizontal rolling mill are arranged in sequence,
In a row of continuous hot rolling equipment that reduces the thickness while reducing the width of a plate material, the upper part of the axis of the pair of vertical rolls of the vertical rolling machine is arranged so as to be inclined in the opposite direction to the traveling direction of the rolled material. A continuous hot rolling equipment row characterized in that table rollers are arranged between the vertical rolls.