Patent ID: 11878337
Assignee: INGVEST AB
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A roll-forming machine comprising a number of forming stations (20a, 20b) for successively roll-forming a flat sheet metal strip (5, 5′) into a hat beam (1, 1′) having a profile that varies along its length and which has a central flange (2), first and second side flanges (3a, 3b) on opposite sides of the central flange (2), a first web (4a) extending between the central flange (2) and the first side flange (3a) and a second web (4b) extending between the central flange (2) and the second side flange (3b),
wherein each forming station (20a, 20b) comprises a first pair of clamping rollers (22a, 22b) for clamping one of the side flanges (3a, 3b) and a second pair of clamping rollers (23a, 23b) for clamping the central flange (2),
the first and second pairs of clamping rollers (22a, 22b, 23a, 23b) are configured to fold one of the webs (4a, 4b) in relation to the associated side flange (3a, 3b) over a first peripheral folding edge (24) on a clamping roller (22b) in the first pair of clamping rollers, and in relation to the central flange (2) over a second peripheral folding edge (25) on a clamping roller (23a) in the second pair of clamping rollers;
the clamping rollers (23a, 23b) of the second pair of clamping rollers are configured to be individually displaceable during a forming operation upwardly and downwardly in a vertical direction and horizontally forwardly and backwardly in a feeding direction of the sheet metal strip (5, 5′) through the forming stations (20a, 20b); and
the roll-forming machine additionally comprises an electronic control device (12) configured to control the displacement of the clamping rollers (23a, 23b) of the second pair of clamping rollers during the forming operation such that a plane (P2) passing through centre axes (CA3, CA4) of both clamping rollers (23a, 23b) of the second pair of clamping rollers is always maintained perpendicular to a part of the central flange (2) received in a nip (31) between the clamping rollers (23a, 23b) of the second pair of clamping rollers.