FIELD: process engineering.
SUBSTANCE: invention relates to pressure shaping, particularly, to fixing tubes in tube plates of heat exchangers. Flanged tube ends feature end bulge, bulge with combined cross-section, and hardened zones, Flanged tube end is fitted into tube plate opening provided with circular groove. Ring with rustproof coat is arranged on flanged tube end bulge. Tube is secured in tube plate opening by applying deforming force to flanged tube end surface by rolls of mechanical rolling. Note here that plate circular groove opening bulge is flattened and force is applied to groove sidewalls. Simultaneously, outer end seal with ring with antirust coat is produced. Then, ledge is produced on flanged tube end iner surface at transition from end ID to tube initial diameter. Shielding sleeve made from tube material is fitted and locked in flanged tube end.
EFFECT: higher strength and reliability of joint, antirust and anti-turbulence protection.
9 dwg
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