Method of rollforming with transverse scorer and dimpler

A method of manufacturing a structural tube comprising steps of:

• providing a roll of sheet material;
• making transverse score lines in the sheet material;
• forming dimples in the sheet material;
• rollforming a tubular shape from the sheet of material, forming a channel in the tubular shape with at least one of the dimples being located in the channel.

A method comprising steps of:

• providing sheet material having a length and width;
• making transverse score lines on the sheet material;
• forming dimples with punches located so that the scoring lines pass under the punches, the punches being configured to form dimples in the sheet material with stop surfaces at locations spaced longitudinally from the score lines;
• and
• continuously rollforming the sheet material into a tubular shape with a rollformer, including forming a longitudinal channel with parallel sidewalls and a perpendicular outer wall on the tubular shape.

A method comprising steps of:

• making transverse score lines on a roll of sheet material;
• forming dimples in the sheet material with punches at locations offset from a centerline of the sheet material;
• rollforming the sheet material including forming a longitudinal channel having orthogonal side and outer walls, and continuously forming the sheet material into a tubular shape;
• welding the tubular shape into a permanent tube;
• and
• separating sections of the tube at the score lines.

A method of manufacturing a structural tube comprising steps of:

• providing a roll of sheet material;
• making transverse scoring lines in the sheet material;
• rollforming a tubular shape from the sheet of material including forming a first longitudinal channel in the tubular shape, the channel having parallel sidewalls and an outer wall that is perpendicular to the sidewalls and further including to a stop dimple in a predetermined location relative to the channel;
• and
• welding the tubular shape into a permanent tube.