EP 2823072 A1 20150114 - BOLT-LIKE FASTENING ELEMENT, IN PARTICULAR DRILLING SCREW, AND CONNECTION ESTABLISHED THEREBY
Title (en)
BOLT-LIKE FASTENING ELEMENT, IN PARTICULAR DRILLING SCREW, AND CONNECTION ESTABLISHED THEREBY
Title (de)
BOLZENARTIGES BEFESTIGUNGSELEMENT, INSBESONDERE BOHRSCHRAUBE, UND DAMIT HERGESTELLTE VERBINDUNG
Title (fr)
ÉLÉMENT DE FIXATION DE TYPE BOULON, PLUS PARTICULIÈREMENT VIS AUTO-TARAUDEUSE, ET ASSEMBLAGE RÉALISÉ AVEC CELLE-CI
Publication
Application
Priority
- DE 102012102019 A 20120309
- EP 2013054265 W 20130304
Abstract (en)
[origin: WO2013131849A1] What is described is a bolt-like fastening element (30), which is preferably in the form of a drilling screw shaped by pressing and/or rolling, having a head portion (LK), which has a holding region (LH) and has a starting hardness, and also having an initial portion (LA), which adjoins the head portion (LK) by way of a transition region (LÜ) and is additionally inductively hardened. The fastening element (30) is produced by cold forming from a blank made of a carbon steel having a starting tensile strength of at least 800 N/mm2. The induction hardening of the fastening element extends only to the initial portion thereof, i.e. in the case of a drilling screw to the drill bit (24) and the first turns of the thread (36). After the induction hardening, the drilling screw substantially has the starting tensile strength and is ductile in the head portion (LK). In the initial portion (LA) as far as into the central axis (33), the drilling screw is fully hardened to a hardness which is at least twice the magnitude of the starting hardness in the head portion (LK). The notched-impact energy in the head portion (LK) of the bolt-like fastening element is at least three times that in the initial portion (LA).
IPC 8 full level
C21D 1/42 (2006.01); C21D 9/00 (2006.01); F16B 25/00 (2006.01); F16B 35/00 (2006.01)
CPC (source: EP US)
C21D 9/0093 (2013.01 - EP US); F16B 25/0026 (2013.01 - EP US); F16B 35/00 (2013.01 - US); C21D 1/42 (2013.01 - EP US); C21D 2221/01 (2013.01 - EP US); Y02P 10/25 (2015.11 - EP US)
Citation (search report)
See references of WO 2013131849A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
DE 102012102019 B3 20130704; EP 2823072 A1 20150114; US 2015010376 A1 20150108; WO 2013131849 A1 20130912
DOCDB simple family (application)
DE 102012102019 A 20120309; EP 13709168 A 20130304; EP 2013054265 W 20130304; US 201314379405 A 20130304