EP 0121252 B1 19890607 - A METHOD OF ROLLING TRANSVERSE RIBBED TUBES AND A SET OF TOOLS FOR ROLLING TRANSVERSE RIBBED TUBES
Title (en)
A METHOD OF ROLLING TRANSVERSE RIBBED TUBES AND A SET OF TOOLS FOR ROLLING TRANSVERSE RIBBED TUBES
Publication
Application
Priority
PL 24132483 A 19830331
Abstract (en)
[origin: EP0121252A2] A method of rolling transverse ribbed tubes consists in that the rib (11) after forming is deflected in the direction of rolling parabolically, the external tube (4) is pressed down to the core tube (5), and deflecting the rib (11) and pressing down the external tube (4) to the core tube (5) is carried out during one revolution of the tube, and afterwards the rib is straightened. A set of tools for rolling transverse ribbed tubes has three tools provided with roll-formed disks (6, 7, 8, 9), supporting and straightening, whereby the second - in the direction of rolling - part of the profile of supporting disks is concave, preferably parabolically, and the last - in the direction of rolling - tool is provided with a supporting disk of the outer diameter bigger by from 0.1 to 0.8 mm from the outer diameter of the other supporting disks.
IPC 1-7
IPC 8 full level
B21H 3/12 (2006.01); B21B 19/00 (2006.01); B21C 37/20 (2006.01)
CPC (source: EP)
B21C 37/207 (2013.01)
Designated contracting state (EPC)
DE FR GB IT NL SE
DOCDB simple family (publication)
EP 0121252 A2 19841010; EP 0121252 A3 19870527; EP 0121252 B1 19890607; CS 247078 B2 19861113; DE 3478581 D1 19890713; HU 197237 B 19890328; HU T38065 A 19860428; PL 139849 B1 19870228; PL 241324 A1 19841008; RO 89288 A 19860315; SU 1268094 A3 19861030
DOCDB simple family (application)
EP 84103535 A 19840330; CS 243384 A 19840330; DE 3478581 T 19840330; HU 129884 A 19840330; PL 24132483 A 19830331; RO 11413984 A 19840331; SU 3716506 A 19840329