JPS61283401A - Hot rolling method for shape steel - Google Patents

Abstract

PURPOSE:To decrease the number of roll exchanges and the amt. of the rolls to be stocked by dividing horizontal rolls, changing the roll width from each other in the roll axial direction and partially rolling the web part of a shape steel. CONSTITUTION:A broad roll is built for the horizontal roll 22 of a universal rolling mill and a narrow roll is built for the horizontal roll 14. These rolls are respectively moved in the roll axial direction. The web part of the shape steel is rolled by the horizontal rolls 22, 14 and the flange part thereof is rolled between the rolls 22, 14 and vertical rolls. The bisected horizontal rolls 15, 16 are built into an edger rolling mill in such a manner that the rolls can move in the axial direction thereof. A rolling material is guided by the roll 24 and a flange end face 20 is rolled down without rolling down the web part 21. The narrow roll is built for the horizontal roll 17 of the succeeding universal rolling mill and the broad roll is built for the horizontal roll 18. These rolls are respectively moved in the axial direction thereof. The web part is rolled by the rolls 17, 18 and the flange part is rolled by the rolls 17, 18 and the vertical rolls. The unrolled part of the web is rolled down by the roll 18 in this stage.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rolling method for hot rolling products of multiple series such as H-section steel and engineered section steel without changing rolls.

Using the materials of the plume 2 and the assembled billet 3, the material is rolled into a shape suitable for the intermediate universal rolling mill 5 by multiple bus rolling in the low AiL mold of the breakdown rolling mill 4 shown in FIG. . Thereafter, after intermediate rolling in multiple passes through the universal rolling mill 5, the edge rolling mill 6, and the universal rolling mill 7, the R-shaped *a1! rolled into products.

Once the product dimensions are determined, the roll dimensions of the finishing universal rolling mill 8 and the roll dimensions of the intermediate universal rolling mill 5 are determined. That is, since the roll widths (A), ←), (C), and (C) in FIG. 6 are designed to be approximately equal, conventionally it was necessary to replace the horizontal roll every time the product dimensions changed.

In recent years, H-shaped steel and engineering shaped steel are rolled at a rate of 4 times a month with multiple sizes and small amounts of pressure.
It is necessary to roll approximately 0 series, and currently the series is IJ.
- The time required to change rolls between rolls is normally 25 to 30 minutes, but off-line roll preparation time requires 2 to 7 hours, so when rolling small lots, there may be a waiting time for roll preparation. become. In order to solve this problem, the seventh
It has been considered to move the rolls in the axial direction using the method shown in the figure to eliminate the need for roll changes between series.

(Problems to be Solved by the Invention) The prior art as disclosed in Japanese Patent Application Laid-Open No. 59-133902 has the following drawbacks. This method uses 1 for each series.
It is certainly considered to be an effective method for the size and thickness. However, in this method, the unrolled portion 13 of the universal rolling mill shown in FIG. 5(A) is
Since the method is to roll the flange end face with the edger roll 11 at the same time as rolling with the horizontal roll 10 (in the figure),
When adjusting the flange width for different thickness sizes, when the edger roll 11 is adjusted, the web thickness at the horizontal roll 100 width (g) also becomes thinner, which affects the web thickness of the product.

Furthermore, when adjusting the web thickness, the flange width is adversely affected, making it extremely difficult to roll a product with regular dimensions. Furthermore, since the web portion is rolled down by the horizontal rolls 11 shown in FIG. 7, it is necessary to prepare a motor with a large capacity for this rolling mill. If the current equipment is used as is, the result will be insufficient motor capacity and roll breakage.

(Objectives of the Invention) The present invention is a rolling method that solves these drawbacks, and aims to reduce the number of roll replacements, reduce the amount of rolls on hand, and improve the roll unit consumption by increasing the use of common rolls.

(Means for Solving the Problems) The present invention has achieved the above-mentioned objects, and its gist is to provide a horizontal rolling mill for a universal rolling mill in a hot rolling method for H-section steel, engineered section steel, etc. The rolls are divided so that the width of the rolls can be mutually changed in the axial direction of the rolls to partially roll the web portion of the section steel, and the horizontal rolls of the next edger rolling mill are also divided to remove the web section of the section steel. A section steel characterized in that only the flange part is configured to be rollable and rolled, and in the same way, the unrolled part of the web part by the horizontal roll in the previous process is rolled by the horizontal roll of the universal rolling mill in the next process. This is a hot rolling method.

The present invention will be described in detail below based on embodiment examples shown in the drawings.

FIG. 1 is a diagram showing the hot rolling method using split rolls of the present invention. In the horizontal roll 22 of the universal rolling mill shown in FIG. 1A, a wide horizontal roll 14 and a narrow roll are incorporated so as to be movable in the roll axis direction. Further, the lower roll is also incorporated vertically symmetrically with the upper roll. The two-divided horizontal rolls 15 and 16 of the edger rolling mill shown in (B) are installed so as to be movable in the roll axis direction, and the lower roll is also installed in the same way as the upper roll.

(The horizontal roll 17 of the C reenipersal rolling mill has a narrow roll, and the horizontal roll t8 has a wide roll. It is set in a convenient position for rolling the product, with the horizontal rolls rolling the web portion and the horizontal rolls rolling the flange portion between the vertical rolls.

At this time, rolling is performed such that the stretching balance is such that π≧1.0 to 1.2 in the relationship between 7-lange stretching λF, web stretching λW, and λ1. Since the web portion 19 is not rolled down by the horizontal rolls, only this portion is thicker than the others.

) in Fig. 1 is an edger rolling mill, the left and right horizontal rolls are set at the required positions, and the web portion 21 is not rolled down.
The rolled material is guided by the horizontal rolls 24 and the flange end face 20 is rolled down.

Figure 1 (0) shows a universal rolling mill in which horizontal rolls with different left and right roll widths are set at convenient positions for rolling products. 7. Roll the 7-lung part between.

At this time, the stretching balance between the web and the 7-lunge is the same as that of the universal rolling mill (A). The unrolled lower part of the web in FIG. 1 (A,) is rolled down by horizontal rolls 1, 8 in (C). Since the web portion 23 in (C) is not rolled down by the horizontal roll, only this portion is thicker than the others, so the horizontal rolls are arranged so that this portion can be rolled down by the next universal horizontal roll.

By arranging the rolling mills in this manner, products with different thicknesses between series can be manufactured using the same method as the conventional rolling method, and therefore can be easily manufactured.

For H-beam steel with a low web height, a combination of a two-part horizontal roll (G) as shown in FIG. 2 and the current one-piece horizontal roll (C) may also be considered.

For H-beam steel with a high web height, as shown in Figure 3, two horizontal rolls (A) and three horizontal rolls (0) are used.
A combination of these is also possible.

(Effects of the Invention) By implementing the present invention, rolling of different thickness sizes for each series can be easily performed by applying the current rolling technology as is. Since the web portion is rolled down using a universal mill, there is no risk of roll breakage or lack of power as would be the case when rolling down the flange end face and web portion at the same time using an edger mill. Further, since the rolling of the flange end face in the edger mill is performed by guiding the inside of the flange of the rolled material, stable rolling can be performed. In addition, the roll replacement work can be significantly reduced compared to the conventional V3, and
The number of rolls held is also reduced to 1/2 of the conventional value, and the roll consumption rate is also V2 compared to the conventional method. Further, by reducing the roll preparation waiting time for small lot rolling, significant energy savings can be achieved in terms of heating furnace fuel costs and electric power consumption.

[Brief explanation of the drawing]

Fig. 1 (6), No), (Q is an H-shaped steel rolled by the rolling method of the present invention.
) (C), Figure 3 (1), ), (0) are diagrams showing other embodiments of the variable width roll, Figure 4 (6),
is a diagram showing the shape of the material when rolling H-shaped steel, ■
Figure 5 is a process diagram of hot rolling of H-shaped steel and ■-shaped steel, and Figure 6 (
4), (B), (0), and (D) are cross-sectional views showing the process of hot rolling of H-section steel, and Figure 7 (6), middle) and (0) are split rolls currently being considered. It is a figure showing the rolling method by. 1... Slab 2... Plume 3... Assembled billet 4... Breakdown rolling mill 5... Intermediate universal rolling mill 6... Edger rolling mill 7... Universal rolling mill 8... Finishing universal rolling mill 14.22...Split horizontal roll 15.16...2 split horizontal roll 1.5.7 Group: Zhe 11 group (-1-Rule Figure 3

Claims (1)

[Claims] In a hot rolling method for H-shaped steel, I-shaped steel, etc., the horizontal rolls of a universal rolling mill are divided and the roll width can be changed mutually in the axial direction of the rolls to partially roll the web part of the shaped steel, The horizontal rolls of the next edger rolling mill are also divided so that only the flange part excluding the web part of the section steel can be rolled, and in the same way, the horizontal rolls of the universal rolling mill of the next process are used to roll the horizontal rolls of the previous process. A method of hot rolling a section steel, characterized by rolling an unrolled portion of a web portion using rolls.