BENT CORRUGATED SECTION AND METHOD OF ITS PRODUCTION Russian patent published in 2013 - IPC B21D5/06 

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming, particularly, to production of bent sheet rolled stock. Central crimp features trapezoidal shape with lateral walls inclined to horizontal through 61°…63°, width making 0.237...0.242 of section width, two half-round crimps directed downward, and height making (3…4) S at its vertex. On both sides of trapezoidal crimp with hc-(0.75…1.67) S-high steps arranged are three half-round crimps at the distance of 1=0.48 Bc, where Bc is width of trapezoidal crimp b=(0,15…0,16) Bc, with width h=0.46...0.47 of the height of this crimp while their radii R=0.35 b. Note here that one of lateral edges of the section is located above its plane by (4.0…5.3) S. Sequential formation of lengthwise crimps is started from the central crimp to be made in I…IV passes in decreasing radius of flexure Rt from (8…10) S to (1.5…2.0) S while steps nearby its base are made in fifth pass. sequential formation of half-round crimps is started from V pass and crimps adjoining trapezoidal crimps, each being formed in fifth passes in decreasing radius of flexure nearby crimp bases from (6…8) S to (2.5…3.3) S. Note here that crimps are shaped at vertex of trapezoidal crimp in XIII…XVI passes on terminating shaping of section lateral edges one of which is located above its plane.

EFFECT: improved geometry.

2 cl, 2 dwg, 1 ex