DEFORMING-CUTTING BROACH Russian patent published in 1998 - IPC

FIELD: mechanical engineering, in particular, equipment for working cylindrical openings in workpieces. SUBSTANCE: deforming-cutting broach has housing with helical swarf discharge grooves in it, and spherical deforming members positioned within helical grooves in linear contact over the whole profile of grooves, beginning from main cutting edge, and in point contact between adjacent members. Helical slots in ends of helical grooves are adapted for receiving pushing pins connected with spring. At least three similar helical grooves have variable angle of inclination along broaching axis, with all grooves in each section having equal angles of inclination. Number of deforming members in working zone may be changed by variable angle of inclination of grooves relative to axis of broaching. EFFECT: increased efficiency and enhanced reliability in operation. 2 cl, 3 dwg