EP 0990708 B1 20030326 - Process for producing coil springs
Title (en)
Process for producing coil springs
Title (de)
Verfahren zum Herstellen von Schraubenfedern
Title (fr)
Procédé de fabrication de ressorts à boudin
Publication
Application
Priority
EP 98118691 A 19981002
Abstract (en)
[origin: EP0990708A1] Production of helical springs made of steel wire comprises subjecting the helical springs to thermomechanical boundary layer reinforcement and first and second shot peening steps. The steps of the first shot peening stage is carried out without pre-tension followed by thermal drop in pressure and then the second shot peening stage.
IPC 1-7
IPC 8 full level
C21D 7/06 (2006.01); C21D 9/02 (2006.01); C21D 1/30 (2006.01)
CPC (source: EP)
C21D 7/06 (2013.01); C21D 9/02 (2013.01); C21D 1/30 (2013.01)
Designated contracting state (EPC)
AT DE ES FR GB IT NL PT SE
DOCDB simple family (publication)
EP 0990708 A1 20000405; EP 0990708 B1 20030326; AT E235567 T1 20030415; DE 59807656 D1 20030430; ES 2190562 T3 20030801; PT 990708 E 20030630
DOCDB simple family (application)
EP 98118691 A 19981002; AT 98118691 T 19981002; DE 59807656 T 19981002; ES 98118691 T 19981002; PT 98118691 T 19981002