FIELD: machine building.
SUBSTANCE: volumetric plastic deformation is performed with several local forces, which are arranged around connecting coupling in two cross sections with uniform angular pitch and moved relative to connecting coupling along screw line. Volumetric plastic deformation of connecting coupling is performed by local forces in the first cross section by the value of gap between connecting coupling and pipes, and strengthening of external coupling surface is performed by local forces in the second section by means of cold deformation. As fasteners of connected pipes, which are arranged between connecting coupling and external surface, there used are elastic split rings or screw combs.
EFFECT: invention improves strength and tightness of permanent coupling connection of pipes.
13 cl, 14 dwg
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