JPH0741283B2 - Rolling method for H-section steel - Google Patents

Description

The present invention relates to a method for rolling H-section steel, and more particularly to a final finishing universal mill having an intermediate universal mill and horizontal rolls of variable width. The present invention relates to a rolling method of H-section steel capable of rolling with a minimum of horizontal rolls in an intermediate universal mill so that it can be matched with a wide range of application of a final finishing universal mill when being rolled.

Conventional technology A universal mill is generally used for rolling H-section steel, etc., but a variable width type is used for the final universal mill for the purpose of improving dimensional accuracy, reducing roll unit consumption, and improving production efficiency. There is a technology that uses horizontal rolls. By using this variable width horizontal roll, it is possible to set an arbitrary horizontal roll width online without changing the horizontal roll, and it is possible to manufacture H-section steels having different inner web widths.

For example, FIG. 5 shows one of the conventional width-variable horizontal rolls, which is a width-variable horizontal roll.
And the arbor 5, the sleeve rolls 4 and 4 move the interposition members 7 and 7 by hydraulic pressure, and the hydraulic clamp mechanism 6 adjusts the width between the horizontal rolls 4 and 4. Therefore, by using this, an H-section steel (see FIG. 6) having an arbitrary web height H and flange width B can be manufactured.

However, even if the horizontal roll width of the final finishing universal mill can be freely changed in this way, in the intermediate universal mill that is the preceding stage mill, the horizontal roll width of the final finishing universal mill ± about 3.0 mm It is necessary to use a horizontal roll with. Therefore, if the desired size of the final finishing universal mill exceeds this regulation, the intermediate universal mill must use another roll that conforms to this regulation, which is a problem in terms of improving the roll unit consumption. It was

Problems to be Solved by the Invention The present invention aims to solve these problems. Specifically, after rolling an intermediate universal mill, the inner width of the web of the rolled material is changed, and the rolled material is smoothly transferred to the final universal mill. An object of the present invention is to provide a rolling method of H-shaped steel that is bitten.

<Structure of the Invention> Means for Solving Problems and Actions Thereof The present invention, in rolling H-section steel, the cross-section of the roll tip is formed with radius dimensions having different radii, and the axis thereof is the longitudinal direction of the H-section steel. Of the H-shaped steel fillet round part rolling down device equipped with a plurality of rounded part rolling rolls tilted in a vertical plane along a cross section perpendicular to the direction, it has a round size corresponding to the round size of the product. H type rolled by selecting an R-section rolling roll and rolling it into a fillet radius dimension and a flange width based on the width expansion amount and cross-sectional dimension of the H-section steel and the radius dimension of the R-portion rolling roll by an intermediate universal mill. After expanding the inner width of the web by rolling the fillet rounded part of steel with the selected rounded part rolling roll while restraining the flange outer surface with the vertical roll set at a predetermined interval, And performing finish rolling at a final universal mill.

The structure and operation of the present invention will be described below with reference to the drawings.

Note that FIG. 1 is a front view of an example of an apparatus for rolling down the fillet round portion of a rolled material that has passed through an intermediate universal mill by the rolling method of the present invention, and FIG. 2 is an explanatory view of the rolling aspect of the fillet round portion at that time. FIG. 3 is a perspective view of an example of a rolling roll of the fillet round portion of the rolling device shown in FIG. 1, FIG. 4 is a front view of an example of a horizontal roll of an intermediate universal mill, and FIG. [Fig. 6] is a front view showing in section a part of an example of a variable width horizontal roll employed in the final universal mill, and Fig. 6 is an explanatory view shown for illustrating the dimensions of H-section steel.

First, when H-section steel is rolled by the method of the present invention, the flange surface is held by a vertical roll (not shown) by the horizontal roll 3 of the intermediate universal mill shown in FIG. This intermediate rolled rolled material dimensions shown in FIG. 4 (a web in the width; W _R, fillet radius dimensions: R _R) has. After that, this rolled material, without rolling in the final universal mill,
As shown in FIG. 1, rolling is performed by the upper and lower round portion rolling rolls 8 of the fillet round portion rolling device.

This fillet radius reducing device has been disclosed by one of the present inventors as Japanese Patent Application No. 60-199206, and has the following structure.

First, in FIG. 1, reference symbol A indicates a rolled material of H-shaped steel, and a fillet round portion (hereinafter, simply referred to as a round portion 3) of this rolled material A is rolled by each round portion rolling roll 8, for example, The radius R of R _S shown in FIG. 2 is formed, and the rolled material formed to the size of R _S is aligned with the desired size of the final universal mill and can be smoothly bitten.

Each of the rounded portion rolling rolls 8 is configured to be movable by a desired value in the vertical and horizontal directions as described below by driving a motor or the like.

That is, the lateral movement mechanism is composed of screw shafts 10a, 10b formed with left and right reverse screws and rotors 9a, 9b connected to the screw shafts 10a, 10b.
When the a and 10b are rotated by the motors 9a and 9b, the round rolls 8 are slid laterally, and in particular, the screw shaft 10
Since a and 10b are formed with left and right reverse screws with the central portion as a boundary, the left and right rounded portion rolling rolls 8 slide so as to approach or separate from each other. The vertical movement amounts are obtained from the position detection devices 11a and 11b, and the roll width (l; outer dimensions of the left and right rounded portion rolling rolls 8) can be set to an arbitrary value by a control device (not shown). The roll width (l) is made to match the roll width W _F (see FIG. 5) of the variable width horizontal roll in the final universal mill.

Further, in order to move the upper and lower round portion rolling rolls 8 and 8 up and down, beams 13a and 13b and a screw shaft are used as a lifting mechanism.
It is composed of 10c, 10d and a motor 9c (however, the lower motor is not shown). Therefore, the beams 13a and 13b move up and down along the housing 14, and the screw shafts 10c and 10d rotate up and down by rotating both motors 9c. Further, when the upper and lower beams 13a and 13b are individually operated by the motor, the gap between the pass line and the upper and lower round portion rolling rolls 8 can be individually changed.

The amount of up and down at this time is obtained from each position detection device 11c (however, the lower one is not shown), and is set to an arbitrary value by the control device as in the above lateral movement mechanism.
The gap between the upper and lower rounded rolls 8, 8 is made to match the desired web thickness tw (see FIG. 2) in the final universal mill.

Further, as described above, when only the fillet round portion of the rolled material A is rolled by the upper and lower rounded portion rolling rolls 8, 8, both flanges of the rolled material A are left and right vertical rolls 15 (however, on the right side). The vertical rolls are not shown).

In addition, each vertical roll 15 is stored in a chock 16,
The screw shaft 10e is rotated by the motor 9e to activate the chock 16 and set to an arbitrary value.
To maintain a predetermined web height. Also each vertical roll
Reference numeral 15 is rotationally driven by a motor 9f, and this rotation advances the H-section steel A of the rolled material. In this way, by rolling with the vertical roll 15 and the round portion rolling roll 8, the fillet round portion 3 of the rolled material A is rolled down with the outer surface of the flange restrained.

The upper beam 13 and the chock 16 are preferably brought into close contact with the screw shafts 10c and 10e. For this purpose,
The balance force can be applied by another device (not shown).

Further, it is necessary to select the horizontal roll 8 having an appropriate radius dimension according to the dimension of the radius portion of the final universal mill to be rolled down. From this point, as shown in FIG. 3, several types of R-roll rolling rolls having different R-dimensions are arranged around the outer ring 17 and the R-roll rolling roll 8 having the R-dimension according to the product size is selected. Outer ring
The ring 17 is configured to come into contact with the inner ring 17a via a ball bearing so as to be rotatable, and is moved to an arbitrary round portion rolling roll predetermined position. Further, during rolling, the outer ring 17 is fixed to the inner ring 17a by the stopper 19 while rotating.

As described above, prior to finish rolling in the final universal mill, if only the rounded portion 3 is rolled in a state in which the flange of the rolled material is restrained from the outside, the other portion of the rolled material A, that is, most of the rolled material A Since this is not done, the constraint of this unrolled part is large. Therefore, the rolled material A does not extend in the longitudinal direction but extends only in the cross-sectional direction perpendicular to the longitudinal direction, and the web inner width W and the flange width B increase. That is, when the rounded portions 3 of the rolled material A are rolled down in a direction in which they are respectively inclined downward or upward by the upper and lower rounded portion rolling rolls 8 and spread to the outside of the flange, the web is orthogonal to the longitudinal direction (outside the web height). Direction), the inner width of the web is expanded relatively easily.

More specifically, as shown in FIG. 2, the radius dimension R _R of the horizontal roll of the intermediate universal mill is made larger than the radius dimension R _{S of the} roll used before entering the final universal mill, and only the radius portion at this time is used. Make sure that only the rounded parts are sufficiently rolled during rolling. At this time, the rounded surface-reduced metal 20 flows into the web 2 and the flange 1, and the web width is expanded from W _R to W _F to match the final universal mill. At this time, although the flange portion also increases, the intermediate universal mill outlet side dimension may be set to a value obtained by subtracting the increase amount in advance.

Example Next, an example will be described.

First, as shown in FIG. 2, the H-section steel A is manufactured by the method of the present invention.
The rounded part 3 of the above was pressed down. At this time, the radius dimension R _R of the intermediate universal mill horizontal roll is set to be larger than the roll radius dimension R _S of the radius portion rolling device, and if the radius portion of the rolled material is set to be sufficiently rolled, the radius reduction of the radius portion is reduced. The generated metal 20 flows to the web and the flange, and the increased amounts ΔW and ΔB are obtained by the equations (1) and (2).

Where tw …… Web thickness t _f …… Flange thickness α …… Metal flow rate to the web with radius reduction area reduction W _R and W _F are the horizontal roll widths of the intermediate and final universal mills. , ΔW = W _F −W _R , the roll radius dimension R _S of the fillet radius section reduction device can be obtained by back calculation from the equation (1).

Therefore, even after the intermediate universal mill rolling, even if the web inner width W _R is considerably smaller than the final universal mill variable width horizontal roll width W _F , the roll radius dimension R _S of the fillet radius reducing device is determined as described above, and conforms. If the selected roll is selected and the fillet round portion is pressed down, the inner width of the web can be increased from W _R to W _F , and the final universal can be smoothly engaged.

<Effects of the Invention> As described above, in the rolling of the H-section steel, the present invention reduces the fillet radius portion of the rolled material rolled by the intermediate universal mill from the outside with the flange surface constrained from the outside to reduce the web. The inner width is expanded, and then finish rolling is performed with the final universal mill.

Therefore, the intermediate universal mill can perform rolling without exchanging the horizontal rolls without being restricted by the regulation of the final universal mill, improving the work efficiency and greatly reducing the roll unit.

Therefore, even if the horizontal roll width of the intermediate universal mill, which is the previous stage mill, is outside the regulation (horizontal roll width ± 3.0 mm) of the final universal mill, it is adapted to the final universal mill online without changing the horizontal roll field. It is possible to improve the basic unit of roll.

[Brief description of drawings]

FIG. 1 is a front view of an example of an apparatus for rolling down a fillet round portion of a rolled material that has passed through an intermediate universal mill by the rolling method of the present invention, FIG. 2 is an explanatory view of a rolling aspect of the fillet round portion at that time, and FIG. Is a perspective view of an example of a rolling roll in the fillet round portion of the rolling device shown in FIG. 1, FIG. 4 is a front view of an example of a horizontal roll of an intermediate universal mill, and FIG. 5 is a width adopted in the final universal mill. FIG. 6 is a front view showing a part of an example of a variable horizontal roll in cross section, and FIG. 6 is an explanatory view shown for illustrating the dimensions of H-section steel. Reference numeral 1 ... Flange portion, 2 ... Web portion 3 ... Intermediate universal mill horizontal roll 4 ... Sleeve roll 5 ... Arbor 8 ... Round portion rolling roll 15 ... Vertical roll 17 ... Outer ring, 19 ...... Stopper 20: Metal whose radius is reduced

Claims (1)

[Claims] 1. In rolling H-section steel, a plurality of rolls whose cross sections are formed with radiuses having different radii and whose axes are inclined in a vertical plane along a cross section perpendicular to the longitudinal direction of the H-section steel. Among the H-shaped steel fillet radius reduction devices equipped with individual radius reduction rolls in a star shape, the radius reduction roll having the radius dimension corresponding to the radius dimension of the product is selected, and the intermediate universal mill is used to form the H shape. Vertical with the fillet rounded portion of the H-section steel rolled into the fillet rounded dimension and the flange width, which are obtained based on the width expansion amount and sectional dimension of the steel, and the rounded dimension of the rounded portion rolling roll, set at predetermined intervals. While restraining the outer surface of the flange with a roll, the selected inner radius roll is used to expand the web width and then the final universal mill is used for finish rolling. Rolling method of H-shaped steel according to.