JPH0832331B2 - Rolling equipment train for profile with flange - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rolling apparatus train for forming various sizes in a profiled product having a flange, for example, a profiled product such as an H-shaped steel and an I-shaped steel in a rolling process. .

[Prior Art] Currently, generally manufactured profile members have a wide variety of types, cross-sectional shapes, and dimensions, and are characterized by an extremely large number of product types and sizes. As a means for efficiently manufacturing these various types and sizes of shaped materials, the applicant of the present invention has previously proposed the technique of Japanese Patent Laid-Open No. 59-202101, which is a so-called skew roll method. The outline of this technology is that of the rolling process of the profile, which consists of rough rolling process, intermediate rolling process and finish rolling process,
Between the intermediate rolling step and the finish rolling step, there is provided a rolling mill having an oblique roll whose roll axis forms a predetermined angle θH with respect to the rolling direction, and a method for widening and rolling the web portion, The purpose is to make H-shaped steel with a constant width or a constant outer width as desired. This skew roll rolling method is an effective means for manufacturing a remarkably diverse product series as compared with the conventional universal rolling method, but there are still points to be improved.

[Problems to be Solved by the Invention] The present invention makes use of the advantages of the above-described skew roll rolling method,
Further, the object of the present invention is to provide means for efficiently manufacturing shaped materials of various sizes, and an outline thereof will be described below by taking an example of rolling of H-section steel by an oblique roll system prior to the detailed description of the present invention. . The characteristic of this rolling method is shown in FIG.
As shown in (b), diagonal rolls 15, 15 'and 16, 16' each having a roll diameter D of two rolls and a roll drum width u are in contact with the inside of the flange of the material 17 having the web height Ho, and By rolling down the web portion close to the flange of the material while maintaining a predetermined angle θH with respect to the plane in which the roll axis is in the horizontal plane and vertical to the rolling direction, and also in the horizontal plane, the angle of θV with the horizontal axis. The material of the part that was made to flow in the width direction,
It has a function of expanding the web in the width direction at the height H ₁ of the web after widening. The width expansion in the width direction is basically θ for each product size.
It is determined by setting the angles H and θV and the skew roll interval (twice L). Fig. 5 shows an example in which the rolling mill (SS) 14 adopting the "oblique roll type rolling method" is incorporated in the hot rolling equipment row of H-section steel. Rough rolling process (BD)
In No. 1, after rolling a rough rolled material 4 using a slab or rough steel slab as a raw material, an intermediate rolled material 25 is provided by an intermediate rolling mill 2 in which a universal rolling mill (RU) and an edger (E) are provided in close proximity to each other for continuous rolling. By rolling, and then combining the oblique roll type rolling mill (SS) 14 and the finishing rolling mill (FU) 3 in which the horizontal widths of the horizontal rolls 32a and 32b are variable, the web outer width OW, which is a typical need, is obtained. It is basically possible to manufacture a "H-shaped steel product series having a constant web outer width and a constant web outer width" or "H-shaped steel product series having an arbitrary web height" with a small number of rolls.

As a result of actual rolling using the above-described skew roll rolling method, it has been found that a defective shape occurs in the following cases. That is, when the amount of widening of the web on the skew roll is large, the web of the top portion in the length direction of the material to be rolled buckled as shown in FIG. 6 (b). It is considered that this is because when the material to be rolled leaves the oblique rolling mill, the compressive force in the web width direction at the end portion in the length direction strongly acts. Further, as shown in FIG. 6 (c), the flange in the middle portion in the length direction of the material to be rolled excluding the top portion has a flange tilt angle θ ₁ of an angle θ in the case of a conventional rolling method that does not use a skew roll. ₀ (Fig. 2 (a)), it may become difficult to bite into the finish rolling mill in the next step. The present invention makes use of the advantages of the rolling method based on the oblique roll method, and provides a novel rolling apparatus train which does not cause the above-mentioned shape defect.

[Means and Actions for Solving Problems] FIG. 1 shows an arrangement of rolling processes for carrying out the present invention.
The same components as those of the conventional skew roll system shown in FIGS. 4 and 5 are designated by the same reference numerals, and the description thereof will be omitted.

The feature of the device train of the present invention is that the straightening process (RG) 5 is arranged at the subsequent stage of the conventional oblique roll type rolling mill (SS) 14. Details of this correction step 5 are shown in FIGS. 2 (a), (b),
At least one of the three types of correction means shown in (c) is selectively arranged as required. (A) is provided with upper and lower web straightening horizontal rollers 33a, 33b for pressing the web portion of the material 35 to be rolled, which is indicated by a broken line. This horizontal roller 3
3a, drum width W ₁ of 33b is the web in Method U ₂ of the rolled material 36 after correction
It was confirmed that if it was set to 1/2 or more, the web buckling at the top part in the length direction of the rolled material was corrected, and no problem would occur in the biting into the finish rolling mill in the next step.

The roll gap S between the upper and lower horizontal rollers is defined by the material 35 to be rolled.
It was found that if the web thickness is less than +1 mm, not only the effect of shape correction but also the reaction force of the roller can be small. As described above, using the straightening process composed only of the web straightening horizontal roller in the subsequent stage of the skew roll rolling machine is because the widening amount of the skew roll is large and the web buckling straightening of the length direction top part is not performed. If necessary, but the flange tilt angle is small, or other means,
For example, it is effective when a small-diameter roll is used as the vertical roll of the finish rolling mill and the like, which does not hinder the biting into the finish rolling mill.

FIG. 2 (b) shows the right and left flange straightening vertical rollers 34a, which press the outer surface of the flange of the rolled material 37 whose straightening process is indicated by broken lines.
It is composed of 34b and is effective in correcting the fall of the flange. The distance W between the vertical rollers 34a and 34b may be set according to the web height of the rolled material 37. In addition, the vertical rollers 34a, 34
If the angle θ of the peripheral surface with respect to the axis of b is set to 5 to 10 degrees, the shape of the flange tip will not deteriorate, but in general, the vertical roll of the intermediate rolling process (RU) in the preceding stage of the oblique roll rolling mill is not affected. The taper may be set to almost the same value. As described above, if the straightening step consisting of only the flange straightening vertical roller is arranged in the latter stage of the skew roll rolling machine, the widening amount in the skew roll is small, and the web buckling does not occur or is slight.
This is effective when the flange tilt angle interferes with the biting into the finishing mill at the next stage.

FIG. 2 (c) shows another aspect of the straightening process, in which the web straightening horizontal rollers 33a, 33b and the flange straightening vertical rollers 34a, 34b are arranged as universal straightening rollers in the same cross section orthogonal to the rolling direction. Is. According to such a universal straightening roller type straightening process, web buckling and flange straightening can be performed in one process.

Further, in the present invention, after the web buckling correction process of FIG. 2 (a), the flange tilt correction process of FIG. 2 (b) may be arranged in series.

In addition, in the case where each of the straightening rollers has a short distance between the intermediate rolling process and the straightening process and a distance between the straightening process and the finish rolling process, and the layout allows continuous rolling and straightening, the pushing force of the intermediate rolling mill and the finishing force are used. The pulling force of the rolling mill can be used for non-driving. On the other hand, when the distance between the front and rear steps of the straightening process is large, it is necessary to drive each straightening roller.

[Example] The size of the intermediate rough rolled material finished in the intermediate rolling step is
Each condition is shown in Table 1 for the example of using the straightening process in which the H250 × 90 × 5/9 ones are widened by the skew roll rolling machine and then the web buckling straightening process and the flange tilt straightening process are arranged in series. The results are shown in Table 2.

As is clear from Table 2, the web buckling at the top of the rolled material after skew roll rolling is unraveled after web straightening. In addition, the flange inclination angle after the straightening of the flange of the intermediate portion of the rolled material is corrected to a range that does not hinder the rolling in the finish rolling step of the next step.

In the above description, the H-shaped steel rolling apparatus train to which the present invention is applied is shown as an example in which the rough rolling step, the intermediate rolling step, the oblique roll rolling machine, the web / flange straightening step, and the finish rolling step are arranged in this order. In the present invention, as shown in FIG. 3, in an apparatus train having two oblique roll mills in a rolling process train, the straightening process may be arranged after each of the oblique roll mills.
Arranging the straightening process after the web widening process in the present invention is used in this sense.

EFFECTS OF THE INVENTION The present invention basically utilizes the effect of widening the web height (or the inner web method) by the oblique roll rolling method, and the buckling of the web at the top part of the rolled material length direction and the flange collapse at the middle part. Since the defective shape due to the above can be eliminated, the rolling operability and the product yield are greatly improved.

[Brief description of drawings]

FIG. 1 is a schematic view for explaining a rolling apparatus train of the present invention, and FIG. 2 shows a roll arrangement in a straightening step of the present invention. (A) is a web straightening horizontal roller, (b) is a flange straightening vertical roller, (c).
Is a schematic front view showing each constitution of a universal straightening roller, FIG. 3 is another embodiment of the apparatus train of the present invention, FIG. 4 is an explanatory view of a skew roll rolling system, (a) is a plane, (b) is Are schematic views of the front, FIG. 5 is an explanatory view of a rolling process having a conventional skew roll rolling machine, and FIG. 6 is an explanatory view showing a cross-sectional shape of H-section steel. 1: rough rolling process, 2: intermediate rolling process, 3: finishing rolling machine, 4: rough rolling material, 5: straightening process, 14: skew roll rolling machine, 15,1
5 ', 16,16': skew rolls, 33a, 33b: web straightening horizontal rollers, 34a, 34b: flange straightening vertical rollers.

Claims (1)

[Claims] 1. A rough web rolling process, an intermediate rolling process, a pair of right and left skew rolls having an axis centered in a plane horizontal to the rolling direction and having a predetermined angle θH with respect to a plane vertical to the rolling direction. In a row of rolling devices for a profile in which the respective steps of a web widening step and a finish rolling step are sequentially arranged, a web straightening horizontal roller, or a flange straightening vertical roller, or a web straightening horizontal roller and a flange are provided after the web widening step. A series of pressure-feeding apparatus for a profile having a flange, characterized by arranging a straightening step having any straightening roller among universal straightening rollers provided with straightening vertical rollers.