METHOD OF MANUFACTURING BIMETALLIC CUTTER Russian patent published in 1995 - IPC

FIELD: foundry engineering. SUBSTANCE: a core with grooves is placed within a capsule. Powder of high-speed steel is poured into grooves. Capsule is heated and extruded through a pattern round window with spiral grooves over periphery. Spiral grooves sizes are decided by the ratio to b ≅ 2h, where h is a groove height (depth) in mm, b is a groove width in mm, H is a capsule shell thickness in mm, is a drawing value in the process of extrusion, F, f are workpiece cross section surfaces in mm² before and after extrusion. Only workpiece of instrument cutting part is extruded. Then workpiece is cut into sections of necessary length, welded with a stem and then the received bimetallic cutter is worked mechanically. EFFECT: enhanced efficiency.