公开(公告)号：EP4197692A1

公开(公告)日：2023-06-21

申请号：EP21214939.7

申请日：2021-12-15

申请人： AB Sandvik Coromant

发明人： CORONEL, Ernesto ,  GADDAM, Raghuveer ,  BLURTSYAN, David

IPC分类号： B23P15/52 ,  B23G1/00 ,  B24B3/18 ,  B24B31/00 ,  B24B31/02 ,  B24C1/10 ,  C21D7/06 ,  B24B19/04

摘要： The invention relates to treatment of a thread cutting tap (1) comprising a thread cutting portion (2) including a plurality of cutting lands (3) separated by flutes (4), wherein the thread cutting portion (2) comprises a chamfered section (5) extending from a front end (7) of the thread cutting tap (1) to a full profile section (6) extending from the chamfered section (5) towards a rear end (8) of the thread cutting tap (1). Each cutting land (3) comprises one or more thread cutting teeth (9) in the chamfered section (5) and a plurality of thread cutting teeth (9') in the full profile section (6), and each thread cutting tooth (9, 9') includes a primary cutting edge. The method comprises
- immersing at least the thread cutting portion (2) of the thread cutting tap (1) in a bed of granules and effectuating relative movement between the thread cutting portion and the granules for removing grinding burr and generating an edge rounding of a first magnitude at the primary cutting edge of each thread cutting tooth (9, 9'); and then
- exposing a subset of the thread cutting teeth (9, 9') to a dynamic plastic deformation treatment, the subset including at least all the thread cutting teeth (9) in the chamfered section (5), such as to generate an edge rounding of a second magnitude, greater than the first magnitude, at the primary cutting edge of each thread cutting tooth in the subset.
The invention also relates to a thread cutting tap produced by such method.