Roll forming system and roll forming method

A roll forming system comprising:

• an uncoiler disposed at a front portion of a process line and uncoiling a coil;
• a straightener disposed at the rear of the uncoiler and straightening the coil uncoiled by the uncoiler to a panel of plate shape;
• a brake press disposed at the rear of the straightener and forming a plurality of holes for assembling at the panel delivered from the straightener;
• a roll forming unit disposed at the rear of the brake press and sequentially bending the panel delivered from the brake press so as to roll-form a shaped beam of a predetermined shape;
• and
• a welding unit disposed at the rear of the roll forming unit and welding each welding position of the shaped beam which is roll-formed,
• wherein the roll forming system further comprises a bending unit disposed at the rear of the welding unit, cutting one side of the shaped beam by a cutting wheel, changing a position of the shaped beam, and pushing the shaped beam to a stretch bending tool so as to bend the shaped beam to have a predetermined curvature in keeping pace with a forming speed of a roll forming in a state that both sides of the shaped beam delivered from the welding unit are clamped,
• wherein the bending unit comprises:
• synchronizing means disposed at the rear of the welding unit and provided with a synchronizing table which can slide along the process line by an operation of a synchronizing motor;
• clamping means mounted on front and rear portions of the synchronizing table, rotating along a width direction of the synchronizing table, and clamping the both sides of the roll-formed shaped beam;
• position conversion means pivotably mounted on the synchronizing table between the both clamping means, connected to the both clamping means, and configured to convert a position of the shaped beam clamped by the both clamping means between a cutting position and a bending position;
• cutting means mounted on the synchronizing table through a cutting frame, moving with the synchronizing table in keeping pace with the forming speed of the shaped beam, and cutting the one side of the shaped beam by moving the cutting wheel forward or backward by a forward/reverse motor;
• and
• bending means disposed on the synchronizing table and bending the shaped beam to have the predetermined curvature by a force of the clamping means in a state that the position of the shaped beam clamped by the clamping means is changed to the bending position by the position conversion means.