METHOD OF FIXING TUBES IN TUBE WALL Russian patent published in 1997 - IPC

FIELD: plastic metal working, namely tube fixing in tube wall by means of local oriented plastic deformation of tube material. SUBSTANCE: method comprises steps of placing tube with gap in tube wall having openings with annular grooves; on inner surface of tube near its end making annular recess whose length exceeds spacing between end surfaces of annular grooves of tube wall; placing tube at arranging its annular recess in zone of end surfaces of annular grooves of tube wall; acting on part of end surface of tube by means of axially moving tool. In the result tube is deformed at displacing its end surface relative to tube wall, and annular grooves are filled by tube material due to free bending of tube in zone of said grooves. EFFECT: enhanced reliability of tube fixing. 5 cl, 5 dwg