Metal working – Expanded metal making
Patent
1993-10-14
1998-12-08
Hughes, S. Thomas
Metal working
Expanded metal making
2989731, 2989735, 526521, 52670, 52673, B21D 3104, B21D 4702, E04C 304
Patent
active
058453792
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method for making a supporting crossbar construction. More specifically the invention relates to a method for making a supporting crossbar construction of thin plate.
THE KNOWN PRIOR ART
U.S. Pat. No. 3,034,197 discloses a method for making crossbar constructions from a thin plate reel by cutting elongated slits in the longitudinal direction of the plate and then expanding the plate in the transverse direction.
U.S. Pat. No. 3,298,081 discloses a similar method for making crossbar constructions as U.S. Pat. No. 3,034,197, however in this case the cut platebars are bent outwards from the plane of the plate before expanding in the transverse direction.
A drawback of the methods according to both these patents is that the bearing strength is low when these constructions are used as crossbar beams.
Today's technology for supporting constructions of thin plate have the disadvantage that a substantial part of the plate material is not used for the supporting function. Attempts to punch out a light beam to a crossbar with a good supporting capacity means big material losses-and high costs.
All crossbar constructions of steel are today made by welding or with bolts. Welding destroys the galvanization and requires a costly subsequent treatment.
SUMMARY OF THE INVENTION
In accordance with the invention the supporting crossbar construction is made from thin plate on a reel, in a continuously running line with punching and roll-forming machines.
Crossbar beams provide a favorable distribution of the material mass into an upper and lower frame, and make a maximum use of the strength of the material.
An advantage of the present invention is that the height of the new crossbar construction easily can be changed. Greater beam height means better bearing strength without increasing the material consumption for the construction. This is an improvement as compared for instance to the previously known light beam.
Another advantage of the present invention is that the construction requires neither welding joints nor bolt joints.
Still another advantage of the present invention is that the fabrication requires no subsequent treatment. This is especially true when anti-corrosive treated thin plate is used.
Another advantage of the present invention is that very little wastage will be produced and material saving is high as compared to today's technology. Material costs are decisive for the economy in thin plate manufacturing, and in the manufacturing method according to the present invention relatively thin plate can be used due to a stiffening bending technique.
Due to an automated manufacturing method and low material usage according to the present invention, a highly competitive price for the product can be reached.
In the subsequent description three different embodiments of the present invention will be described, whereby three different products are produced, as follows: constructions, and
The raw material used is preferably 0.8-2.5 mm steel plate, supplied on reels.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in detail with reference to the accompanying drawings.
FIG. 1 discloses a production line for manufacturing of a crossbar beam for light construction and a trapezoidal crossbar construction and includes references to other figures which provide more detailed views of the features depicted.
FIG. 2A-2B disclose various view of a punching station in the production line according to FIG. 1.
FIG. 3A-3D disclose various views of a station in the production line of FIG. 1 for bending the plate into a circular arc.
FIG. 4A-4D disclose various views of a first roll-forming station in the production line of FIG. 1 for making a crossbar beam.
FIG. 5A-5F disclose various views of a further product machining step in the production line of FIG. 1 for making a crossbar beam.
FIG. 6A-6B disclose various views of a first roll-forming station in the production line of FIG. 1 for making a trapezoidal crossbar construction.
FIG. 7A-C7 disclose
REFERENCES:
patent: 2990038 (1961-06-01), Diamond
patent: 3034197 (1962-05-01), Watanabe
patent: 3298081 (1967-01-01), Terrell et al.
patent: 3763616 (1973-10-01), Pastorelli et al.
patent: 4004334 (1977-01-01), Greenley
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