EP 0585589 B1 19960918 - Method of automatic and iterative process optimization of drawing operations in presses
Title (en)
Method of automatic and iterative process optimization of drawing operations in presses
Title (de)
Verfahren zur selbsttätigen, iterativen Prozessoptimierung von Ziehvorgängen in Pressen
Title (fr)
Procédé pour l'optimisation de processus d'emboutissage automatique et itératif aux presses
Publication
Application
Priority
DE 4229155 A 19920901
Abstract (en)
[origin: US5450347A] A method for the iterative process optimization of drawing processes, occurring in timed sequence, in drawing presses, in which the clamping force which can be set at the blank holder is reduced (in the case of fractures) or increased (in the case of folding) or maintained at the same level (in the case of acceptable parts) for a subsequent working cycle as a function of the drawn part quality of a drawn part drawn in a proceeding working cycle. In order to be able to detect the drawn part quality with respect to the criteria of fractures, acceptable or folding automatically during each working cycle and, accordingly, to be able to design the optimization process as a genuine control process which occurs automatically in a closed cycle, before the start-up of production of a specific type of a part to be drawn, a pressing stroke-dependent desired value drawing force range of the drawing force exerted on the drawn part during the drawing process is detected and the data are stored, the drawing force needing to stay within this range in order to be able to expect fracture-free and fold-free, that is to say acceptable drawn parts. During production, the pressing-stroke-dependent actual-value drawing force variation is measured and it is monitored whether this variation stays within thaws desired-value drawing force range during the entire drawing path and/or whether it has exceeded (fractures) or undershot (folds) the desired-value drawing force range. Influencing factors which are relevant to the drawing process and can be detected on the semi-finished product are also continuously detected and appropriately taken into account when setting the blank-holding force.
IPC 1-7
IPC 8 full level
B21D 22/20 (2006.01); B21D 22/22 (2006.01); B21D 24/14 (2006.01); B30B 15/16 (2006.01); B30B 15/26 (2006.01)
CPC (source: EP US)
B21D 22/20 (2013.01 - EP US); B21D 22/22 (2013.01 - EP US); B30B 15/0088 (2013.01 - EP); B30B 15/26 (2013.01 - EP US)
Designated contracting state (EPC)
ES FR IT
DOCDB simple family (publication)
DE 4229155 A1 19940303; DE 4229155 C2 19940623; EP 0585589 A1 19940309; EP 0585589 B1 19960918; ES 2095530 T3 19970216; JP 2855400 B2 19990210; JP H07290161 A 19951107; US 5450347 A 19950912
DOCDB simple family (application)
DE 4229155 A 19920901; EP 93111631 A 19930721; ES 93111631 T 19930721; JP 24585993 A 19930826; US 11422593 A 19930901