| 摘要 |
Provided are an apparatus and method for manufacturing a spiral duct The apparatus includes: a first edge forming roll for forming dual bent parts at both straight edges of a metal band; a cutting roll for cutting the metal band extracted from the first edge forming roll in a waved shape by periodically varying a horizontal rotation angle or in a straight shape in its longitudinal direction; a second edge forming roll disposed in front of the cutting roll in feeding direction of the metal band to form a single bent part of the waved edges of the cut metal band; and a seaming device for coupling a single bent part with the dual bent part winding the cut metal band in a spiral shape. The method includes: supplying a metal band; forming an outward bent part, a vertically bent part, and an inward bent part at both straight edges of the metal band; periodically varying a horizontal rotation angle of a cutting roll to cut the metal band in a waved shape in its longitudinal direction to divide the metal band into two cut metal bands; forming a single bent part at the waved edge and a dual bent part at the straight edge; and coupling the single bent part with the dual bent part winding the cut metal band. Therefore, since a horizontal rotation angle of a cutting roll is periodically varied to continuously cut a metal band along a straight line and a waved line, it is possible to form a duct in which straight connection ducts are integrally formed with a curved duct. In addition, since the cut parts of the metal band is formed smoother, it is possible to precisely and securely couple a single bent part with a dual bent part at their seam parts.
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