METHOD OF MAKING BIMETALLIC TUBULAR WORKPIECES Russian patent published in 1994 - IPC

FIELD: metal working. SUBSTANCE: method involves assembling workpieces, deformation, and thermal treatment. Annular grooves are made at outer and inner workpieces. Hole of outer workpiece receives ring member from material of higher plasticity than the material of the workpiece. Inner workpiece is placed into the ring. Hole of inner workpiece receives holder fabricated from material having coefficient of thermal expansion higher than or equal to that of the inner workpiece of adaptor. Adaptor is forced through pressure ring into die made from material having coefficient of thermal expansion lower than that of the adaptor. Adaptor is sintered in a ring member having coefficient of thermal expansion lower than that of the adaptor. EFFECT: enhanced efficiency of the method. 2 cl, 4 dwg