JPH0454523B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) A rough-shaped steel billet with a cross-sectional shape close to an H-shape is used as a raw material, and a predetermined shape is formed during multiple passes in a rough universal mill and one pass in a finishing universal mill. In the process of obtaining an H-shape with dimensions, a so-called edger mill is attached to the rough universal mill for forming the flange end after rolling down the web and flange with the rough universal mill, and this type of H-shaped steel rolling When forming the edge of a flange in an edger mill, the edge of the flange can be formed without any deviation in the flange leg length, and even if the rolling series changes, that is, the product size group with the same flange leg length and inner web width, there is no need to replace the rolls of the edger mill. The results of development research on achieving advantageous chance-free rolling are described below.

(Prior art) Japanese Patent Application Laid-Open No. 52-54653 discloses that a roller pair of an edger mill having a drum-shaped peripheral surface is used to roll down the flange edge of a material to be rolled that has passed through a universal mill, thereby forming a flange. It is disclosed that the flange width reduction, which determines the width dimension, is carried out in accordance with the shaping of the edge, and at this time, although a web guide is installed to control the centering and positioning of the rolled material in the left-right direction of the roll pair, the flange It cannot provide a function to suppress or correct leg length deviation.

In this respect, rolls with a large diameter and small diameter roll bodies with a thick taper on both sides, which have been widely used and have been called body rolls, are not suitable for rolled materials with uneven flange leg lengths. On the other hand, the necessary correction can be achieved by appropriately setting the caliber depth of the barreled roll according to the rolling series, but on the other hand, there is the inconvenience of having to replace the roll every time the rolling series changes. .

On the other hand, by closely fitting the sleeve-shaped divided roll into the left and right halves of the roll with a body and shifting them, it is useful for guiding the inner surface of the flange, and even when the rolling series changes, the roll is necessary. It is also known that it is possible to set the position to ensure the correct position, but if it is possible to correct the deviation in the flange leg length, it is still necessary to change rolls between rolling series with different flange leg lengths.

(Problems to be solved by the invention) 1. There is no need to change the rolls regardless of the change in the rolling series, 2. It has the effect of correcting the deviation in flange leg length, and 3. The flange width reduction and flange edge forming are easy. It is an object of the present invention to provide an edger mill for rolling H-section steel that can perform the following steps.

(Means for Solving the Problems) This invention consists of two pairs of rolls, one of which has an operating surface that guides and supports the inner surface of the flange of an H-shaped material to be rolled, and the other. is characterized in that each pair of rolls is arranged along the rolling pass line in an upside-down relationship with respect to each other, each having a working surface useful for forming the flange end of the material to be rolled. This is an edger mill for rolling H-shaped steel.

This edger mill for H-shaped steel rolling consists of a pair of rolls, one of which consists of an assembled roll of a roll arbor and a collar that is movable in the axial direction, and the other of which consists of an hourglass-shaped roll. It is particularly preferred in practice that the height of the flange exceeds the maximum leg length of the flange of the material to be rolled.

Contrary to the conventional wisdom that the rolling process in an edger mill is usually carried out using only one stand, this invention uses two sets of edger rolls to roll the ends of the upper half of the flange leg around the web. The present invention provides an edger mill for rolling H-section steel that satisfies all the requirements of the problem to be solved by separating the functions into forming and forming those forms in the lower half.

Now, FIG. 1 shows the configuration of the present invention, and FIG. 1A and FIG.
As explained in Section B, these roll pairs are arranged in tandem. Specifically, the configuration and functions of each are shown below.

First, in FIG. 1A, the lower roll side is made up of a pair of left and right collar-shaped variable width sleeve rolls 3 that can be slid in the axial direction with respect to the roll arbor 2 by external force. It is also possible to roll a rolling series of the inner width of the web. Of course, by making the height of the collar measured from the roll arbor 2, that is, the roll leg length C, slightly larger than the product leg length (B _nax ) of the widest flange width, rolling series with all flange leg lengths can be rolled.

In addition, a drum-shaped roll 4 is arranged on the upper roll side,
Needless to say, there is no need to change the rolls as in the case of different rolling series.

First, at the stage shown in Fig. 1A, in order to obtain the required flange leg length K, the upper and lower roll gaps M are set to M=K+w (w is the web thickness) at point P, and the upper half of the rolled material is The upper half side flange end can be formed in the same manner as the side flange leg length K.

Next, in FIG. 1B, the flange leg length K and flange end portion of the lower half of the material to be rolled are formed by arranging the rolls completely upside down compared to the case of A.

By going through both steps A and B, we can obtain uniform leg lengths for the upper, lower, left, and right flanges of the rolled material, and even if the flanges originally have different leg lengths, we can produce products with less center deviation. Obtainable.

Next, FIG. 2 shows the situation when rolling a material 1' which is 2L larger than the web height N of the material to be rolled 1 in FIG. 1B.

In this case, adjustment is possible simply by moving the variable width sleeve roll 3 outwardly by an amount L to the left and to the right by external force.

Next, FIG. 3 shows the situation when rolling a material 1'' whose flange leg length is shorter than the rolled material 1 in FIG. 1A by Q. In this case, from the state in FIG. 16 in the vertical direction (Y direction) by Q
This can be done by simply moving to .

For reference, three examples of conventional edger mill rolling mills are shown in FIGS. 4a, 4b, and 4c, along with their problems.

(1) The edger rolling mill having the drum-shaped rolls shown in FIG. The flange width is reduced to determine the dimensions, and the flange end is formed to make it flat. At this time, the rolled material 1 is placed on top,
A web guide 7 is attached to the rolling mill in order to center and position the lower rolls 5 and 6 in the left and right direction. In this configuration, when the rolled material 1 has a center deviation ΔS (ΔS=1/2(AB)), the edger roll does not have any effect of correcting the center deviation.

(2) The edger rolling mill having shelled rolls shown in FIG. 4b is the most commonly used rolling mill, and this configuration is effective in correcting the center deviation. In other words, even if the rolled material 1 has a center deviation, by appropriately determining each caliber depth H of the roll pairs 8 and 9, for example, if A>H before rolling, it can be corrected to A=H by rolling. This makes it possible to easily correct the center deviation. However, with this method, it is necessary to replace the rolls when the rolling series changes.

(3) The variable width edger rolling mill shown in Fig. 4c has left and right divided rolls 10, 10', 11, 1
1' are fitted into the roll arbor 12, 13 respectively, and each roll is shifted in the axial direction (the In this case, the roll position can be set arbitrarily by shifting each roll, so there is no need to rearrange the rolls.

However, in order to obtain the effect of correcting the center deviation ΔS, it is necessary to make the roll flange height H close to the flange leg length of the rolled material 1, and in that case, the difference between rolling series with different flange leg lengths It becomes necessary to perform a role change. Therefore, it was not possible to overcome the contradictory antinomy with respect to the purpose of this invention as already stated.

(Function) FIG. 5 illustrates a typical layout of an H-section steel rolling line and shows an example of how the edger mill according to the present invention is used therein.

First, the material frame 14, beam blank 1
5 or the slab 16 is heated to a predetermined temperature in the heating furnace 13, and then in the breakdown mill 18,
By repeatedly rolling (reverse rolling) in several hole shapes, a rough shaped steel piece 19 is obtained.

Next, by reverse rolling in the rough universal mill group (consisting of the rough universal mill 20 and edger mill 21), the area is reduced according to the predetermined product web thickness, flange thickness, and flange width. give.

Here, to explain universal rolling with reference to FIG. 6, a pair of horizontal rolls 22, 22' and vertical rolls 23, 23' can each be positioned independently with respect to the material 1 to be rolled, and the material 1 to be rolled can be By reversing the mill group and reducing the roll gap each time the roll is rolled, the area can be reduced to a predetermined thickness.

In the rough universal mill, since the roll shape has a material orientation gradient Q as shown in the figure, the shape of the edger roll described above has a roll angle Q corresponding to the shape of the edger roll.

In addition, in universal rolling, the four flange tips of the material (indicated by z) become free surfaces that are not constrained by the rolling rolls, so in order to guarantee the tip shape and flange width F, the flange ends are rolled at edge mill 21. This is what I have already mentioned. The molded material is generally rolled in one pass with a finishing universal mill 24 as shown in Fig. 7, so that the flange surface is finished flat and the final product is finished to the required predetermined dimensions. Take the process.

(Effects of the invention) 1. Omission of roll changes due to rolling series change 2. Improvement of product dimensional accuracy by preventing center deviation 3. This invention can provide particularly advantageous solutions regarding improvement of product dimensional accuracy by improving flange width accuracy. .

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of rolling behavior according to the present invention, and FIG.
Figure 3 is an explanatory diagram of the roll chance free rolling procedure, Figure 4 is a comparison diagram of a conventional example, Figure 5 is a rolling mill layout diagram, and Figures 6 and 7 are explanations of rolling behavior by a universal mill. It is a diagram. 1... Rolled material, 2... Roll arbor, 3, 4...
Roll Vs.

Claims (1)

[Scope of Claims] 1 Consists of two pairs of rolls, one of which has an operating surface that guides and supports the inner surface of the flange of the H-shaped material to be rolled, and the other has an operating surface that guides and supports the inner surface of the flange of the material to be rolled. For rolling H-beam steel, each pair of rolls is arranged along a rolling pass line in an upside-down relationship with respect to each other, each having a working surface that serves to form the ends. Etziya Mill. 2. The edger mill according to claim 1, wherein one of the pair of rolls is an assembled roll of a roll arbor and a collar movable in the axial direction thereof, and the other is an hourglass-shaped roll. 3. The edger mill according to claim 2, wherein the height of the collar measured from the roll arbor exceeds the maximum leg length of the flange of the material to be rolled.