EP 0317830 B1 19920930 - A METHOD OF BENDING METAL OBJECTS
Title (en)
A METHOD OF BENDING METAL OBJECTS
Publication
Application
Priority
PL 26903987 A 19871126
Abstract (en)
[origin: EP0317830A2] This present invention solves the problem of bending objects, particularly flat parallel ones, without employing an external force. The method according to this present invention involves subjecting the material of the object bent to a repetitive, two-phase heating and cooling process. During the first phase, the material undergoes heating with a concentrated stream of energy causing a thermal effect along the predetermined bending line and a partial plasticising, melting and flowing out in the region of the bending line. On the other hand, the material is subjected in the second phase to being cooled at ambient temperature or, additionally, in a stream of a blown air, thereby causing the previously heated material to shrink along fibres in the direction perpendicular to the bending line due to the internal stresses created by the thermal shrinkage of the material in the heated region, and thus the deformation of the material to be permanently changed. The method is suitable for bending metal objects.
IPC 1-7
IPC 8 full level
B21D 11/20 (2006.01); B23K 26/00 (2006.01); C21D 1/00 (2006.01); C21D 9/46 (2006.01)
CPC (source: EP)
B21D 11/20 (2013.01); C21D 1/00 (2013.01); C21D 9/46 (2013.01)
Designated contracting state (EPC)
DE ES FR GB IT
DOCDB simple family (publication)
EP 0317830 A2 19890531; EP 0317830 A3 19900523; EP 0317830 B1 19920930; DE 3875078 D1 19921105; DE 3875078 T2 19930218; ES 2035219 T3 19930416; JP H01192423 A 19890802; PL 155358 B1 19911129; PL 269039 A1 19890530
DOCDB simple family (application)
EP 88118683 A 19881109; DE 3875078 T 19881109; ES 88118683 T 19881109; JP 29938588 A 19881124; PL 26903987 A 19871126