FIELD: metal working, finishing cylindrical openings of parts.
SUBSTANCE: broach includes deforming-cutting member having in outer surface inlet and reverse cones inclined relative to axis of broach, grooves and protrusions of the same width. Between inlet and reverse cones cylindrical Band is arranged. In order to increase life of broach due to lowering cutting effort, grooves are inclined relative to axis of broach and they form positive rake angle in cross section normal to lateral surface of groove. Said positive angle is arranged at left side from front end at right arrangement of grooves or at right side when grooves are arranged at left side. Length of working portion of cutting edge and spacing from start of cylindrical band until back end of deforming-cutting member in projection on axis of broach are determined according to given relation.
EFFECT: enhanced life of broach.
4 dwg
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