FIELD: metallurgy.
SUBSTANCE: invention refers to metal pressure shaping and can be used for construction of bridge and under-crane structures, as well as during roofing of large bays of buildings. Cylindrical pipe of round section is expanded in cold state by being flattened from inside between two matrixes. It is plastically deformed to oval profile consisting of two mutual mirror arches connected to each other by means of bearing plates with formation of one-piece oval tubular section with relative height and main inertia moment with regulated mathematical relationships. Relative height of section corresponds to its maximum resistance moment.
EFFECT: enlarging application scope of pipes and reducing their material consumption.
4 dwg, 3 tbl
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RU2477773C1 |
