METHOD FOR MAKING BUILDUP PRODUCTS WITH LENGTHWISE LAMINARITY Russian patent published in 1998 - IPC

FIELD: plastic metal working, namely, extrusion of buildup-thickness blanks for making tubes with clad working surface. SUBSTANCE: method for making buildup products with lengthwise laminarity comprises steps of placing one hollow blank inside another, inner hollow blank is made of less strength material; assembling and fixing blanks one relative to another, heating buildup blank, setting it onto needle for subsequent extrusion through cone die due to placing blank in container and applying axial compression effort to end of buildup blank; using elongated blanks and fixing them due to successively realizing multiple operations of local plastic compression of material of inner blank for thickening walls of the last and calibrating its opening at simultaneously shifting part of its length relative to outer blank in conditions of field of radial pressures acting upon contact surface of blanks; forming uniform or non-uniform field of radial pressures acting upon contact surface of blanks along length of outer blank. EFFECT: enhanced efficiency. 3 cl, 5 dwg