ROLLS OF FRONT STANDS OF SECTION BENDING MILL AND METHOD FOR SHAPING SECTION AT TECHNOLOGICAL TRANSITION FOR MAKING LEDGE BAND Russian patent published in 2008 - IPC B21D5/06 

FIELD: plastic working of materials, namely tools for making thin-web sections such as bands of ledges.

SUBSTANCE: rolls include working roll grooved pass, shaping rolls, centering guiding beads of lower roll with distance between its inner end surfaces equal to width of section at inlet of rolls, cone members accompanying preliminary shaping of section until its inlet to working grooved pass. Cone surfaces trapping guided section are formed on guiding beads in front of its inner end surfaces. On cone members accompanying preliminary shaping of section before it penetrates closed working roll grooved pass there are inner end surfaces. Distance between cone surfaces and end surfaces is equal to width of section shaped in closed roll grooved pass. Method comprises steps of trapping introduced section, centering it along inner guides of roll ends, preliminary shaping of section along cone surfaces of rolls by free bending until section penetrates working roll grooved pass. Inlet section is trapped before centering it by means of cone surfaces of guiding beads and after preliminary shaping of it by free bending in cone members of rolls section is specially pulled in by means of upper rolls to working roll grooved pass at restricting section by width during manufacturing transition.

EFFECT: improved accuracy of shaping process.

4 cl, 3 dwg