EP 2344288 A2 20110720 - METHOD AND DEVICE FOR THE NON-CUTTING PRODUCTION OF AN OUTSIDE THREAD ON HOLLOW METAL WORK PIECES
Title (en)
METHOD AND DEVICE FOR THE NON-CUTTING PRODUCTION OF AN OUTSIDE THREAD ON HOLLOW METAL WORK PIECES
Title (de)
VERFAHREN UND VORRICHTUNG ZUR SPANLOSEN HERSTELLUNG EINES AUSSENGEWINDES AUF HOHLFÖRMIGEN WERKSTÜCKEN AUS METALL
Title (fr)
PROCÉDÉ ET DISPOSITIF POUR RÉALISER UN FILETAGE EXTÉRIEUR SANS ENLÈVEMENT DE MATIÈRE SUR DES PIÈCES CREUSES EN MÉTAL
Publication
Application
Priority
- EP 2009007073 W 20091002
- DE 102008049899 A 20081003
Abstract (en)
[origin: WO2010037551A2] The invention relates to a method for the non-cutting production of an outside thread on hollow metal work pieces for use as hollow screws, hollow shafts, threaded sleeves or fittings as stable connecting or fastening elements, and to a device suited for carrying out the method. Based on the disadvantages of the known prior art, a method is to be presented which is particularly suited for thin-walled work pieces and characterized by improved economic efficiency. Furthermore a device suited for carrying out the method is to be provided. As a proposed solution, within a multistage press (20) comprising a displaceable carriage (21) and a stationary work piece carrier unit (22), a wire section (27) as the base material is reshaped in one or more reshaping stages I to V into a finished hollow blank (4b). In the multistage press (20), the pre-fabricated hollow blank (4b) is inserted in a further stage VI into a multipart split tool (1, 8) having a cavity, the inside wall of which is provided with a negative threaded profile. In the closed state of the split tool (1, 8), at least one mandrel (6) is inserted into the central opening of the blank (4b) and the blank (4b) is widened, wherein the contours of the threaded profile is filled by a radial material flow and subsequently the finished work piece (4) is removed.
IPC 8 full level
B21J 5/12 (2006.01); B21K 1/56 (2006.01); B21K 27/00 (2006.01)
CPC (source: EP KR US)
B21J 5/12 (2013.01 - EP KR US); B21K 1/56 (2013.01 - EP KR US); B21K 27/00 (2013.01 - EP KR US)
Citation (search report)
See references of WO 2010037551A2
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 MK MT NL NO PL PT RO SE SI SK SM TR
Designated extension state (EPC)
AL BA RS
DOCDB simple family (publication)
DE 102009048040 A1 20100408; CN 102170981 A 20110831; CN 102170981 B 20140416; EP 2344288 A2 20110720; JP 2012504497 A 20120223; KR 20110084215 A 20110721; US 2011185783 A1 20110804; WO 2010037551 A2 20100408; WO 2010037551 A3 20100708
DOCDB simple family (application)
DE 102009048040 A 20091002; CN 200980139669 A 20091002; EP 09767936 A 20091002; EP 2009007073 W 20091002; JP 2011529481 A 20091002; KR 20117010219 A 20091002; US 200913122443 A 20091002