Hilti Aktiengesellschaft

Juergen Gahn

Andreas Vorhauer

Franz Huber

Corinna Achleitner

Simon Oppeneiger

Georg Oberndorfer

Carl Hoffmann

Berthold Aumueller

Martin Pleil

A method for manufacturing a thread-forming screw having a shank and a thread formed in one piece with the shank and region-wise circumferentially arranged on the shank, is disclosed. After the formation of the thread on the shank, a plurality of recesses is subsequently stamped into the thread. Then, a plurality of compact cutting elements is welded into the recesses in the thread, where the cutting elements are made of a hard material and have a hardness greater than the hardness of the thread. Additionally, a stamping device for carrying out the method is also disclosed.

Method for manufacturing a thread-forming screw

A screw () includes at least one thread () arranged on the screw shaft (); circumferentially surrounding the shaft () at least in some regions, and having a thread pilot () located in the free region () of the shaft () and a plurality of recesses () provided in the thread () and opening radially outwardly, with the recesses () each having a first limiting wall () adjacent to the thread pilot () and a second limiting wall () remote from the thread pilot (), and a plurality of cutting bodies () formed of a material having a hardness greater than a hardness of the thread, located in the recesses () formed in the thread () and having each a longitudinal axis () and an outer surface () surrounding the axis () at a distance therefrom, with the recesses () each having a bearing section () with a plurality of generatrices extending substantially along a course of the thread () for receiving, at least in some regions, the outer surface () of a respective cutting body ().

Self-tapping screw

Growing community of inventors

Altstaetten, Switzerland

Juergen Gahn