METHOD FOR SECURING TUBES TO TUBE PLATES

摘要

plastic metal working, namely processes for mounting tubes in tube plates of heat exchangers at using effect of local oriented plastic deforming of tube material. SUBSTANCE: method comprises steps of placing one end of preliminarily prepared tube in tube plate opening having inner and outer annular grooves; fixing tube against its possible motion and mounting it in opening of tube plate by expanding at applying compression effort to inner surface of tube; realizing expanding by two stages: at first stage forming annular supporting protrusion on tube at filling volume of inner annular groove of tube plate opening with tube material; at second stage pressing out tube material from its free end to supporting annular protrusion. EFFECT: possibility for achieving desired operational characteristics of expanded joint without increasing compression efforts acting upon inner surface of tube. 7 dwg