Patent ID: 7159432
Filing Date: 2007-01-09
Classification: B21D

Abstract:
1. Device for bending sections with walls which have cross-sectional areas at different distances from the axis of the bend to be produced, the device comprising a bending tool with at least one pressing element and at least one opposing pressing element assigned to one of the pressing elements, and where at least one pressing element and at least one of the opposing pressing elements assigned to it can be moved relative to each other to squeeze at least one cross-sectional area of the section wall situated on the outside with respect to the axis of the bend, the at least one pressing element and the at least one of the opposing pressing elements being movable in the cross-sectional direction of the at least one squeezed cross-sectional area of the section wall, wherein the pressing element or elements ( 27 ; 37 ; 86 ; 106 ; 116 ) are advanced toward the opposing pressing element or elements ( 23 ; 33 ; 73 ; 103 ; 113 ) in the cross-sectional direction while maintaining a gap between them, the width of the gap in at least one cross-sectional area being smaller than a cross-sectional area of the wall of the section to be bent which is being transported through the gap, wherein the pressing element or elements are designed as rollers, and/or as rolls ( 27 ; 37 ; 47 ; 57 ; 67 ; 86 ; 106 ; 116 ) which rest against an outer side of the section wall, wherein the opposing pressing element or elements are designed as mandrels ( 13 ; 23 ; 33 ; 73 ; 103 ; 113 ) which rest against interior areas of the cross section of the section wall, wherein the device for bending has a stationary section guide housing ( 81 , 82 ) and a cam unit ( 83 , 84 ), which rotatably surrounds the section guide housing ( 81 , 82 ), on which cam unit the roller, the roll, or the several rollers or rolls ( 86 ), which are rotatably supported independently of the cam unit ( 83 , 84 ), are mounted.