EP 0356375 B1 19940316 - Method of cold pressing a conical exterior screw thread.
Title (en)
Method of cold pressing a conical exterior screw thread.
Title (de)
Verfahren zum Kaltpressen eines konischen Aussengewindes.
Title (fr)
Procédé à matricer à froid un filet extérieur conique.
Publication
Application
Priority
CH 319088 A 19880826
Abstract (en)
[origin: US4941341A] The process is carried out using a press tool which has a plurality of dies which are arranged around a longitudinal axis and are radially displaceable with respect to this axis. The radially inner surfaces of the dies correspond to segments of the conical thread to be pressed. During pressing of a conical thread in cylindrical workpiece, the dies are first drawn apart in the radial direction and the workpiece is then pushed between the dies, along a length which corresponds to only a few thread turns. The dies are then pressed toward one another in order to press into the workpiece a short conical thread in which only the first thread turn may be formed to its full depth. After the dies have been drawn apart, the workpiece is displaced between the dies through a further length which once again corresponds to only a few thread turns. When the dies are pressed toward one another again, the previously pressed thread turns are pressed deep into the workpiece and additional thread turns are formed. This process is repeated several times until the conical thread has been pressed to the predetermined total length.
IPC 1-7
IPC 8 full level
B21K 1/56 (2006.01)
CPC (source: EP US)
B21K 1/56 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE DE ES FR GB GR IT LU NL SE
DOCDB simple family (publication)
EP 0356375 A2 19900228; EP 0356375 A3 19910116; EP 0356375 B1 19940316; AT E102855 T1 19940415; CA 1318990 C 19930615; CH 676564 A5 19910215; DE 58907213 D1 19940421; US 4941341 A 19900717
DOCDB simple family (application)
EP 89810017 A 19890111; AT 89810017 T 19890111; CA 588799 A 19890120; CH 319088 A 19880826; DE 58907213 T 19890111; US 30048989 A 19890123