EP 1425141 A1 20040609 - COLD-HEADED STANDOFF
Title (en)
COLD-HEADED STANDOFF
Title (de)
KALTGESTAUCHTER ABSTANDSHALTER
Title (fr)
DOUILLE-ENTRETOISE A TETE FORGEE A FROID
Publication
Application
Priority
US 0307832 W 20030318
Abstract (en)
[origin: WO2004014620A1] A process for cold forging a metal fastener such as a self-clinching standoff includes a punch and die set at the final head trimming station which produces the shear burr only on the underside of the fastener head where it is not visible after installation. At this station, a fastener blank (16) having a tubular barrel and a temporarily formed circular head is placed into a bore of the punch (23) with a barrel of the fastener residing in the bore with the underside of the circular head abutting an end face of the punch. The forging apparatus then moves the die toward the top side of the fastener until a polygonal cutting edge of the die (12) shears metal from around the edges of the circular head of the fastener blank. Movement of the die stops when the cutting edge lies beyond the underside of the head of the fastener. At this point, a knock-out pin (21) which is reciprocal within the bore of the punch forcibly ejects the fastener through a passage in the die to a point beyond an opposite side of the die. The forging apparatus then moves the die away from the punch and, once the die is clear of the punch, a stripper sleeve (25) which is reciprocal about the outside surface of the punch moves from a retracted position over the end of the punch removing a residual scrap ring (18) from around the outside of the punch.
IPC 1-7
IPC 8 full level
B21J 13/00 (2006.01); B21G 3/12 (2006.01); B21J 9/02 (2006.01); B21J 13/02 (2006.01); B21J 13/14 (2006.01); B21K 1/44 (2006.01); B21K 1/50 (2006.01); B21K 1/56 (2006.01); B21K 1/64 (2006.01); B26D 7/06 (2006.01); B26F 1/14 (2006.01)
CPC (source: EP)
B21J 5/027 (2013.01); B21J 9/022 (2013.01); B21J 13/14 (2013.01); B21K 1/44 (2013.01); B21K 1/50 (2013.01); B21K 1/56 (2013.01)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2004014620 A1 20040219; AU 2003225790 A1 20040225; CA 2454527 A1 20040219; CN 1282510 C 20061101; CN 1564727 A 20050112; DE 60305130 D1 20060614; DE 60305130 T2 20061221; EP 1425141 A1 20040609; EP 1425141 A4 20040630; EP 1425141 B1 20060510; JP 2005519772 A 20050707; JP 3919119 B2 20070523
DOCDB simple family (application)
US 0307832 W 20030318; AU 2003225790 A 20030318; CA 2454527 A 20030318; CN 03801228 A 20030318; DE 60305130 T 20030318; EP 03784731 A 20030318; JP 2004527534 A 20030318