Friday, 11 July 2014
Deep Drawing
Deep drawing may be a sheet forming method within which a sheet blank is radially drawn into a forming die by the mechanical action of a punch.[1] it's therefore a form transformation method with material retention. the method is taken into account "deep" drawing once the depth of the drawn half exceeds its diameter. this is often achieved by redrawing the half through a series of dies. The rim region (sheet metal within the die shoulder area) experiences a radial drawing stress and a tangential compressive stress as a result of the fabric retention property. These compressive stresses (hoop stresses) lead to rim wrinkles (wrinkles of the primary order). Wrinkles are oftenprevented by employing a blank holder, the perform of that is to facilitate controlled material flow into the die radius.
