Patent ID: 8931981
Filing Date: 2015-01-13
Classification: B23D,Y10T

Abstract:
1. A pull reamer for machining the inner surface of a tube, comprising a cylindrical shank part having a diameter adapted to receive a pulling tool and a blade part having a plurality of blades extending in an axial pull direction, wherein the blade part has diameters greater than the shank part and wherein the axial pull direction is the direction in which the pull reamer is pulled through the tube, wherein the blade part is subdivided into a main part and an entry part, wherein the entry part tapers conically in the axial pull direction, wherein the entry part forms a roughing stage on a front region as viewed in the axial pull direction and a rear region is directly adjacent thereto and forms an uninterrupted connection therewith, said roughing stage having smaller conicity than a rear region of the entry part, wherein the roughing stage is virtually cylindrical.