Abstract
A micro-hydromechanical deep-drawing (MHDD) apparatus for manufacturing a micro-complex-shape components and increasing of drawn cup accuracy has been developed in this study. This apparatus with a simple forming process mechanism can achieve high dimensional accuracy using servo press mechanics with a double-action type, one-stroke forming process without transferring and positioning, force control, and fine flow rate control of the pressure medium. It is confirmed that the MHDD apparatus developed can prevent wrinkling by applying an appropriate constant gap and stably generate the counterpressure. Micro-drawn cups of 0.8mm diameter are successfully fabricated. Also, the effects of counterpressure on drawability and dimensional accuracy at the bottom of the cup are investigated for phosphor bronze, stainless-steel, and pure titanium foils with a thickness of 50μm. The appropriate counterpressure applied in MHDD results in wrinkling constraint and a reduction in frictional drawing force. Consequently, it is concluded that the forming limit and dimensional accuracy can be improved by MHDD.
