FIELD: repair jobs. SUBSTANCE: cavity is made in tube by means of cutting tool forming flat end located below rear circular groove. Then axial force P is applied to end surface of this cavity to cause plastic tension of material of tube at area of location of circular grooves, after which axial force is additionally applied to remaining cross section of tube. EFFECT: reliable protection of holes in tube sheets against deformation and distortion of geometric sizes of their circular grooves. 4 dwg
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RU2163850C1 |
