EP 2080572 B1 20091230 - Method for cold forging high strength fastener from austenitic 300 series material
Title (en)
Method for cold forging high strength fastener from austenitic 300 series material
Title (de)
Verfahren zum Kaltschmieden eines hochfesten Befestigungsteils aus austenitischem Serie-300-Material
Title (fr)
Procédé pour le forgeage à froid d'un fixateur grande résistance d'un matériau austénitique de la série 300
Publication
Application
Priority
EP 08151306 A 20080212
Abstract (en)
[origin: EP2080572A1] The present invention pertains to a method (3) for cold forging high strength fastener with austenite 300 series material comprising the procedures of initially preparing a raw austenite shaft (41) and then proceeding through a cold forging method to reduce its diameter (d1) for thereafter generating a preliminary shank (42), which can undertake above 1/2 force more than the raw shaft; further passing through the following formations of the head (43), the drill portion (44) and threads (45) in sequence to build an integral fastener (4). Thus, the entire cold forging facilitates to fabricate the fastener with high strength and hardness by lower manufacturing cost and with effective corrosion resistance, so as to firmly drill the fastener into objects and increase the screwing security.
IPC 8 full level
CPC (source: EP)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 2080572 A1 20090722; EP 2080572 B1 20091230; EP 2080572 B9 20100714; AT E453470 T1 20100115; DE 602008000489 D1 20100211; DK 2080572 T3 20100412; ES 2339190 T3 20100517; HR P20100179 T1 20100430; PL 2080572 T3 20100630; PT 2080572 E 20100406; SI 2080572 T1 20100430
DOCDB simple family (application)
EP 08151306 A 20080212; AT 08151306 T 20080212; DE 602008000489 T 20080212; DK 08151306 T 20080212; ES 08151306 T 20080212; HR P20100179 T 20100329; PL 08151306 T 20080212; PT 08151306 T 20080212; SI 200830021 T 20080212