METHOD OF MOULDING VARIETAL ROLL-FORMED SHAPES Russian patent published in 2008 - IPC B21D7/00 

FIELD: technological processes.

SUBSTANCE: method of moulding varietal roll-formed shapes relates to plastic metal working and is designed for processing work pieces mainly with thickness h=2...8 mm with given mechanical properties. The method involves overcastting elements with a final bend radius, which increases with increase in h. For steel with flow point σ_f≤270 MPa, the value of the final bend radius is determined from the relationship: R₁=(1,85...2,25)(h-0,4) σ_f/σ_b mm, and for steel with flow point 470≥σ_f>270 MPa from the relationship: R₂=(2,15...2,45)(h-0,4) σ_f/σ_b mm, where σ_b is the breaking stress of steel, MPa. There are more application properties of the roll-formed shapes and yield gain.

EFFECT: more application properties of the roll-formed shapes and yield gain of the material.

2 ex