| 摘要 |
PURPOSE: A method and an apparatus for forming spiral tube for boiler are provided to reduce waste of fuel, thereby improves economic feasibility by forming the spiral tube on the outer circumferential surface of tube using a compound roller, thereby increasing heat efficiency as electric heat coefficient inside the spiral tube is being increased. CONSTITUTION: The method for forming spiral tube comprises a step (S110) of cutting width of raw material supplied with being rolled to a certain area according to size of tube; a step (S120) of forming a tube by welding an end part of the material rolled in the circular shape after rolling the cut material in a circular shape; a step (S130) of cutting the formed tube to a certain length after grinding a welding region of the formed tube and forming the grinded tube in a real circle; a step (S140) of forming a spiral tube by forming a spiral on the outer circumferential surface of the cut tube to a size that is the same as or less than diameter of the cut tube; degreasing step (S150) of removing foreign materials adhered to the outer circumferential surface of the spiral tube; solution treatment step (S160) of equalizing structure in which stress is generated by changing structure when performing welding on the degreased spiral tube; processing step (S170) of levelling the solution treated spiral tube in a straight line and chamfering the leveled spiral tube as long as a length of the spiral tube extended during spiral forming; water pressure measuring step (S180) of sorting the durability measured spiral tubes by measuring durability of the chamfered spiral tubes; vortex probe measuring step (S190) of sorting the spiral tubes by measuring water flown in a swirl shape by the spiral of the spiral tubes after plating the spiral tubes sorted after passing through the water pressure measuring step; and packing step (S200) of indicating specification on the spiral tubes sorted after passing through the vortex probe measuring step (S190), and packing the specification indicated spiral tubes through inspection.
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