Metal deforming – By use of roller or roller-like tool-element – Included in roller-cluster
Patent
1996-10-15
2000-05-02
Butler, Rodney A.
Metal deforming
By use of roller or roller-like tool-element
Included in roller-cluster
B21B 1310
Patent
active
060558377
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a method of producing a shape steel having a flange and a web by rolling, and a rolling mill line. More particularly, this invention relates to a rolling method for producing, dividedly and very accurately, H-shaped steels or steels having analogous shapes, having diversified web heights, by a universal mill including vertical rolls whose axes are moved towards the delivery side of a rolling direction with respect to the axes of horizontal rolls, and a rolling mill line for such a rolling method.
BACKGROUND ART
Shape steels having a flange and a web, such as an H-shaped steel, are produced generally through the steps of rough rolling by a breakdown mill, intermediate rolling by a universal rolling mill and finish rolling. Since this method uses horizontal rolls having the same barrel width in the same series, an inner width W.sub.B of an H-shaped steel is constant as shown in FIG. 4(a). When a flange thickness t.sub.F is different, a web height (outer width) W changes with this thickness, the web height becomes different even in the same series, and it is only one set of sizes whose nominal size and web height coincide in each of the standards (JIS, ASTM, BS, DIN, etc). On the other hand, when beams of a building structure are produced by mutually bonding rolled H-shaped steels of several sizes inside the same series, there occurs the disadvantage for the execution because one of the flange outer surfaces is generally registered and deviation twice the difference of the flange thickness occurs in the other. In the case of reinforced concrete building structures, the dimension of the post or the beam is limited by a shell dimension. Therefore, when the conventional rolled H-shaped steels are used, a concrete cladding thickness varies with the size and this is disadvantageous from the aspect of design, too. Therefore, the conventional rolled H-shaped steels are not convenient to use in some cases depending on the applications such as coupling between the post and the beam, between the beam and the beam, between the post and the post, etc, of a building. Therefore, production of rolled H-shaped steels having a constant web height (outer width) W in the same series as shown in FIG. 4(b) has been earnestly desired.
Means for regulating the web height of the H-shaped steels in the same rolling time is described in Japanese Examined Patent Publication (Kokoku) No. 1-47241 and in Japanese Unexamined Patent Publication (Kokai) No. 2-6001. Namely, these references disclose a method of reducing the inner width of the web of an intermediate rolled material after rolling by a rough universal mill at the stage of finish rolling. This is the rolling method characterized in that a finish universal mill equipped with a pair of upper and lower horizontal rolls having a variable barrel width and a pair of right and left vertical rolls is disposed, and when an intermediate rolled material passes through this universal mill, the portion of the intermediate rolled material corresponding to the web is rolled down in the transverse direction by the vertical rolls of the finish universal mill so as to adjust the web height of the intermediate rolled material. This mill is produced by modifying the pair of upper and lower horizontal rolls of a conventional so-called "universal mill" so that the barrel width can be varied, and this method is practical means which makes it possible to adjust the web height of the H-shaped steels by a relatively economical equipment investment.
However, the web portion has a relatively large ratio of the width W.sub.B to the thickness t.sub.W (W.sub.B /t.sub.W : slenderness ratio). Therefore, when the rolling reduction quantity of the web in the transverse direction (web width reduction quantity) is increased, the web undergoes curving or buckling as shown in FIGS. 5(a) and 5(b), and excessive metal occurring due to the reduction of the web width is likely to exist non-uniformly in the proximity of the joint portion (fillet portion) between the web and the
REFERENCES:
patent: 3854315 (1974-12-01), Winkler
Patent Abstracts of Japan, vol. 014, No. 379 (M-1012), Aug. 16, 1990 & JP 02 142602 A (Kawasaki Steel Corp).
Hayashi Shinya
Ikuta Kazushige
Nishino Taneharu
Yamane Hiroshi
Yamashita Hiroshi
Butler Rodney A.
Nippon Steel Corporation
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