METHOD FOR MAKING LINERS AND LINER MADE BY SUCH METHOD Russian patent published in 2001 - IPC

FIELD: manufacture of liners for elongated cylindrical products such as bodies of cylinders of plunger pumps and so on. SUBSTANCE: thin-wall tube is placed coaxially with gap in thick-wall envelope. Before placing tube its inner and outer surfaces are strengthened by physicochemical process by depth no less than 0.1 mm for achieving hardness no less than 800 HV. Then tube and envelope are mutually joined along contact surfaces due to deforming them by cold or warm radial forging. Blanks have different mechanical properties. EFFECT: enhanced operational reliability of products made of liners in severe operation conditions due to strict rectilinearity of inner surface of liner along its whole length, improved wear resistance, rigidity of structure. 6 cl, 1 dwg, 1 ex