METHOD OF MANUFACTURING WIRE FROM SINTERED MATERIALS BASED ON TUNGSTEN Russian patent published in 1995 - IPC

FIELD: powder metallurgy. SUBSTANCE: squeezed sintered workpiece is repeatedly rolled on edge at the temperature of 1450 ± 50 C in four-high square roll-passes. 20-40 per cent of workpiece is reduced at a pass. Total reduction is of 50-60 per cent. Further rolling is effected with total drawing of 1,4-1,6 in two-high roll-passes of square-oval circle type at a speed of 1,2-1,5 m/sec. Rotation forging and drawing are effected after rolling. Due to this method lamination decreases up to less than 10 per cent. Besides quantity of defects on laminated parts of wire reduces. EFFECT: enhanced quality. 8 dwg, 2 tbl