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 end portions of preliminarily prepared tube in openings of two tube plates, each opening having inner and outer annular grooves; fixing tube against its possible motion relative to tube plates and fastening it in openings of tube plates by expanding; realizing expanding process by two stages: at first stage filling volume of inner annular grooves of both tube plates with tube material in zone between tube plates at applying effort to inner surface of tube; at second stage loading tube ends by axial compression effort and initially filling volume of outer annular grooves of said openings with tube material. EFFECT: possibility for achieving desired operational characteristics of expanded joints without increasing efforts applied to inner surface of tube. 7 dwg