Metal deforming – With cutting – By shearing tool-couple
Patent
1996-05-09
1998-05-12
Crane, Daniel C.
Metal deforming
With cutting
By shearing tool-couple
72335, 723554, 72359, 298973, 52634, 527291, B21D 2832
Patent
active
057492565
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/CA94/00620, filed Nov. 8, 1994.
TECHNICAL FIELD
The invention relates to a hot rolled metal beam, and a method of manufacturing such a beam, and in particular to such a hot rolled beam having flanges and a web joining the flanges and wherein the flanges have a predetermined first thickness and wherein the web has a predetermined second thickness less than said flange thickness, and wherein said web has openings formed therein, and to a forging die for forging portions of such a beam, or for cold forging other metal members.
BACKGROUND ART
Hot rolled metal beams typically being manufactured of steel, although other metals may also be used, are used in a wide variety of load bearing applications. In most cases, they employ a pair of flanges spaced apart from one another, and a web joining the flanges. Typical such beam sections are an I-section, and a C-section, and more complex sections. Such beams may be used in the construction of various buildings, heavy vehicles, road and bridge construction. In many of such applications, it is desirable to fabricate the beam in such a way as to maximize strength, and to reduce the actual metal content of the beam. Where numerous beams are used for example in a building, it will also reduce the overall weight of the building.
In particular, the so called "castellated" beam shows many of these advantages. This beam typically is formed of a solid I-section hot rolled beam. The I-section is then cut along the middle of the web, usually into a more or less zig-zag pattern. The two halves of the beam are then rewelded together with the peaks of the zig-zag portions in contact with one another. The zig-zags thus form openings between the joined peaks. An example is shown in U.S. Pat. No. 4,894,898, Inventor P. A. Walker.
The resultant fabricated castellated beam is considerably deeper through the web, than the original beam, but the flange portions of the beam remain unchanged.
Such a beam will have increased load bearing capacity as compared with the original solid I-beam section, without containing any additional metal, and thus, without any increase in weight, as compared with a solid I-beam.
Castellated beams also have the advantage that by providing openings through the web of the beam, it becomes possible to pass services through the beam. Clearly this is not possible using a conventional beam with a solid web.
It would however be clearly desirable if a method could be developed for making a beam, with openings pierced through the web, but without the expensive and time consuming cutting and welding operation and also without the need for trimming the ends of the beam.
If a beam can be rolled, with flanges of standard thickness and with a web which is substantially thinner than the standard web thickness, of a conventional beam, while overcoming web the distortion problem, significant reductions in the cost of such beams could be obtained without a corresponding penalty of loss of capacity.
In the foregoing general remarks, while references have been made to castellated beams, it will be appreciated that the demand for castellated beams is only a very small fraction of the demand for hot rolled beams. The advantages described above, when such improved beams are compared with conventional beams, which represent by far the largest portion of the market, are very considerable, and represent a major breakthrough in the manufacture of such beams.
DISCLOSURE OF THE INVENTION
With a view to achieving the foregoing objectives the invention comprises a method of manufacturing a hot rolled beam, said beam having flanges of a predetermined first thickness, and a web extending between said flanges, said beam being initially rolled in a hot rolling mill to provide a beam member having continuous flanges, and a web joining the same, and said flanges having a predetermined first thickness, and said web having a predetermined second thickness less than said first thickness, and said beam member having been then cooled, and comprising the steps
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Crane Daniel C.
Gealow Jon Carl
Rotary Press Systems Inc.
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