PURPOSE: To give a rigidity to a fin and to fix strongly the fin to a pipe by crushing the side edge part of the position to become the outer peripheral part of the fin in case of winding the metallic tape on which a corrugation is formed to the pipe.
CONSTITUTION: The continuous corrugation having an equal pitch is formed with pressing both faces of a metallic tape 2 by a corrugator 3. The start end part of the metallic tape 2 which passed through the corrugator 3 is fixed to a pipe 1 with its state of intersecting at right angles with the pipe axle and the metallic tape 2 is spirally wound with rotating the pipe 1. The side edge part of the position to become the outer peripheral part of a fin 6 is then flattened with crushing by a rolling device 5. The fin 6 is then fixed in the state of being passed to the pipe 1 by giving a rigidity to the fin 6 also by acting a compression force on the inner peripheral part thereof. The fin 6 therefore comes in close contact with the pipe 1 with its becoming in standing state automatically on being crushed of the outer peripheral part.
| JPS5387964 | HEAT EXCHANGER MANUFACTURING PROCESS |
| JPS5978719 | PRODUCTION OF ALUMINUM-FINNED IRON PIPE |
YOSHINUMA MIKIO
WATANABE ETSURO
