FIELD: treatment of pressure metals.
SUBSTANCE: invention relates to metal forming. Tube is installed on bending machine together with mandrel containing rope with strings strung on it. Mandrel is fitted in mandrel tube to be located at maximum distance from bending radius centre to create compression stresses in sections of bending pipe section that prevail over tensile stresses and bend it. Reducing the outer wall of the pipe.
EFFECT: invention can be used in production of various bent parts from thin-wall pipes.
1 cl, 1 dwg
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Authors
Dates
2019-10-23—Published
2017-08-23—Filed