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1. (WO2014195061) THREAD FORMER AND ROLLING DIE

Pub. No.:    WO/2014/195061    International Application No.:    PCT/EP2014/058401
Publication Date: Fri Dec 12 00:59:59 CET 2014 International Filing Date: Fri Apr 25 01:59:59 CEST 2014
IPC: F16B 25/00
B21H 3/02
Applicants: ARNOLD UMFORMTECHNIK GMBH & CO. KG
Inventors: WERTHWEIN, Bernd
JOHANNING, Werner
VOGEL, Georg
Title: THREAD FORMER AND ROLLING DIE
Abstract:
The invention relates to a self-tapping screw comprising a screw shaft (1) and a screw thread (3) as well as a grooved section (4) that proceeds from the front end (2) of the screw and extends across an axial length which approximately corresponds to the nominal dimensions of the screw. A support section of the thread is connected to this grooved section. In the preferably slightly cone-shaped grooved section, the grooves (6) formed between the windings of the thread by the thread flanks are initially designed flatter proceeding from the front screw end and they continually approach, in their form, the steeper cross-sectional shape of the grooves present in the support section. This gradual transition forms a counter thread from the screw, which allows greater loads. The invention likewise suggests a rolling die for producing such a screw, and a thread former.