US 12,420,346 B2
Reamer with front gash design
Herbert R. Kauper, Rosstal (DE); Juergen Schwaegerl, Vohenstrauss (DE); and Li Ning, Pleasant Unity, PA (US)
Assigned to KENNAMETAL INC., Latrobe, PA (US)
Filed by Kennametal Inc., Latrobe, PA (US)
Filed on Mar. 24, 2022, as Appl. No. 17/702,866.
Prior Publication US 2023/0302556 A1, Sep. 28, 2023
Int. Cl. B23D 77/00 (2006.01)
CPC B23D 77/006 (2013.01) 20 Claims
OG exemplary drawing
 
1. A reamer, comprising:
a shank portion extending from a rear end; and
a cutting portion extending from the shank portion to a front end, the cutting portion being devoid of flutes and including a plurality of cutting teeth separated by a plurality of gashes, each cutting tooth having a cutting edge extending in a longitudinal direction from the front end to proximate the shank portion, the cutting portion including a margin trailing each cutting edge and extending along each cutting edge to proximate the shank portion, each cutting tooth also has a primary relief formed between the cutting edge and the front end and a secondary relief extending longitudinally between the margin of one cutting tooth to the cutting edge of an adjacent cutting tooth;
a coolant bore that extends through the shank portion; and
a plurality of coolant outlet ports that are in fluid communication with the coolant bore,
wherein a coolant outlet port of the plurality of coolant outlet ports is located on the secondary relief of each cutting tooth and positioned rearward of a corresponding gash of the plurality of gashes such that fluid exiting the coolant outlet port is directed into the gash to prevent chips generated during a reaming operation from flowing in the rearward direction,
wherein a width, W, of each cutting tooth increases in a radially outward direction with respect to a central, longitudinal axis of the reamer when viewed from the front end of the reamer.