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1. (WO2018010831) METHOD AND TOOL FOR PRODUCING A THREADED HOLE

Pub. No.:    WO/2018/010831    International Application No.:    PCT/EP2017/000753
Publication Date: Fri Jan 19 00:59:59 CET 2018 International Filing Date: Wed Jun 28 01:59:59 CEST 2017
IPC: B23G 5/06
B23G 5/20
B23D 13/00
Applicants: AUDI AG
Inventors: KOPTON, Peter
Title: METHOD AND TOOL FOR PRODUCING A THREADED HOLE
Abstract:
The invention relates to a method for producing a threaded hole (1) in a workpiece (5) by means of a thread tapping tool (23), which has at the tapping tip (25) thereof a main cutting edge (27) and a thread profile (29), which lags in a thread tapping direction (I) and has at least one thread cutting tooth (41, 42, 43, 44), wherein, in a thread tapping stroke (G), the main cutting edge (27) produces a core hole and at the same time the thread profile (29) forms an internal screw thread (9) on the inner wall of the core hole until a target thread depth (tG) is achieved, specifically at a thread tapping advancement (fG) in the thread tapping direction (I) and a thread tapping rotational speed (nG) of the thread tapping tool (23) synchronized with said thread tapping advancement, wherein, after the thread tapping stroke (G), an opposite reversing stroke (R) is performed, in which the thread tapping tool (23) is removed from the threaded hole in a reversing direction (II), specifically with an opposite reversing advancement (fR). According to the invention, the thread profile (29) has at least one broaching cutting edge (46, 48, 50, 52). During the reversing stroke (H), a broached groove (R1 to R4) is produced by means of the broaching cutting edge (46, 48, 50, 52), through which broached groove the thread cutting tooth (41, 42, 43, 44) is removed from the threaded hole (1) in a stress-free manner.