Metal deforming – By use of roller or roller-like tool-element – Plural roller-couples
Patent
1985-01-02
1987-08-11
Spruill, Robert L.
Metal deforming
By use of roller or roller-like tool-element
Plural roller-couples
72177, 72199, 72225, 72235, 72366, B21B 108
Patent
active
046853197
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a rolling method and apparatus for forming sections having a flange, such as H-sections, channels, and other similar shapes.
2. Background Art
Sections of many varieties and sizes are now manufactured which differ greatly in kind, sectional shape, and dimensions. In order to manufacture a variety of sections differing in kind and size according to known rolling methods, it is necessary to set many rolls and accessory members according to the kinds and sizes of the sections. This causes the frequency of rolls-exchange to be increased, leading to a considerable time loss due to this exchange. FIG. 1 illustrates the arrangements of conventional rolling equipment rows, and the shapes of the grooves of the rolls attached to this rolling equipment. More specifically, FIG. 1-(a) shows an example in which two-high or three-high rolling mills are arranged from the roughing zone to the finishing zone, wherein I-beams and channels are formed by rolling, FIGS. 1-(b) and 1-(c) show examples in which two-high or three-high rolling mills are arranged in the roughing zone and universal rolling mills are arranged in the intermediate rolling and finishing zones, wherein H-beams and channels are formed by rolling, and FIG. 1-(d) shows an example in which two-high or three-high rolling mills and universal mills are appropriately arranged in the roughing, intermediate rolling and finishing zones, and straight web-type sheet piles are formed by rolling. In the conventional rolling method as shown in FIG. 1, exclusive rolls and accessory guides to be used from the roughing zone to the finishing zone should, in principle, be provided for the respective products independently, according to the kind and size of the products. Accordingly, as the sizes of the products are increased and the production range is broadened, the manufacturing costs are increased, and it becomes difficult to satisfy the needs of the customers in a simple way.
The above problem will now be described in detail taking the production of an H-beam as an example. Recently, production of so-called build-up H-beams through bonding and assembling steel sheets by welding has increased in line with the progress made in new welding techniques. This is because H-beams having optional sizes can be freely prepared according to customer needs. Typical products produced by this method are H-beams having a relatively small thickness and series of H-beams differing in flange thickness but having a constant web outer width.
H-Beams having a constant web outer width but differing in flange thickness are adapted for bonding and working operation when used in a beam construction. However, these H-beams are not prepared according to conventional rolling methods, for the following reasons.
FIG. 2-(a) shows a typical example of a conventional H-beam forming rolling equipment row, which comprises one breakdown rolling mill 1 (BD), a subsequent mill group 2 (RU-E) of a 4-roll universal rolling mill (RU) and an edger rolling mill (E), and a finishing 4-roll universal rolling mill 3 (FU).
FIG. 2-(b) shows shapes 4, 5, and 6 of rolled materials shaped by the rolling mills 1, 2 and 3, respectively. FIG. 3 shows the relationship between the rolls and the rolled materials in the universal rolling method for forming H-beams. Because of the functional limitations of the universal rolling mill, sizes that can be freely changed by a pair of rolls of the same set during the rolling operation are restricted to a gap 9 between upper and lower horizontal rolls 7 and 8 and gaps 12 and 13 between vertical rolls 10 and 11 and respective opposing sides of upper and lower horizontal rolls 7,8. Accordingly, the web thickness 9 and flange thicknesses 12 and 13 of the H-beam can be changed, but the inner width IW of the web must remain constant. Accordingly, where a series of H-beam products differing in web thickness 9 are prepared by rolling, if the left and right flange thicknesses 12 and 13 are changed, the outer width OW of the web corr
REFERENCES:
patent: 276322 (1883-04-01), Acaster
patent: 1243051 (1917-10-01), Dieter
patent: 2361729 (1944-10-01), Nedden et al.
patent: 3488986 (1970-01-01), Stammbach
Aoyagi Koshiro
Betsuki Kenji
Nishino Taneharu
Katz Steve
Nippon Steel Corporation
Spruill Robert L.
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