Deep-drawing with hydraulic counter pressure presents numerous advantages compared to conventional deep-drawing. Hydromechanical deep-drawing is a capable process for producing complicated and tapered-shaped stamping parts as well as parts which require excellent surface quality, i.e. outer body panels. Due to the lower costs of dies as compared to those for conventional deep-drawing, hydromechanical deep-drawing for low volume production allows cost-savings. The aim of the investigations reported in this paper was to design and test a die set for hydromechanical deep-drawing of tank trays. The experimental investigations with aluminium and steel sheets have shown that it is possible to draw good parts in a single operation. Whereas it proved to be possible using a rectangular blank for steel sheets, aluminium required that one edge of the blank need to be cut off both the upper and lower tank trays. It must be into account that it was not necessary to spot-in the binders and that no draw beads were needed when using an multipoint cushion system. The metal flow was controlled by locally optimized blankholder surface pressures generated by separately controllable hydraulic cylinders installed in the die. It appears to be practical to control each of the hydraulic cylinders separately and not to organize them into groups. The blankholder surface pressure should be controlled for each cylinder individually in comparison with the punch stroke and should not be kept constant over the stoke of the punch. For further investigations, gainers are introduced into the punch where the drawing depth is small.
Hydromechanical deep-drawing
Hydromechanisches Tiefziehen
Production Engineering. Research and Development ; 7 , 2 ; 7-12
2000
6 Seiten, 19 Bilder, 12 Quellen
Article (Journal)
English
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