FIELD: plastic metal working, namely manufacture of helical coils of heat exchangers. SUBSTANCE: method comprises steps of U-bending finned tube and forming its different-length branches; bending up end portions of said tube branches by angle (90-(90-γ)°) degrees, where γ - lead angle of helical line of coiling; securing bent up ends to mandrel and coiling tube onto mandrel. Length difference of branches of U-shaped finned tube is equal to half of length of mandrel circle. Before and after U-bending operation finned tube is annealed. EFFECT: enhanced efficiency. 10 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| ARRANGEMENT FOR BENDING | 0 |
|
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|
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| HEAT EXCHANGER, METHOD OF MANUFACTURE OF FLAT COILS OF CONVECTIVE SURFACE OF HEAT EXCHANGER AND DEVICE FOR BENDING FINNED TUBES IN REALIZATION OF THIS METHOD | 1998 |
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| AUTOMATIC MACHINE FOR MATERIAL DOUBLE-SPIRAL SPRINGS WITH UNBENT ENDS | 0 |
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SU1282948A1 |
| 0 |
|
SU484036A1 |
