Experimental Investigations of Hydrodynamic Deep Drawing of Galvanized Steel to Form a Hemispherical and Complex Cup

In this work, a blank of galvanized steel blank with 80 mm diameter and 0.7 mm thickness and the hydromechanical deep drawing process to make a hemispherical and complex cup. Hydraulic oil was used to apply different amounts of fluid pressure. The work of this study was done in the following three states: In the first state, the experimental work was done without fluid pressure, so the product has wrinkles. In the second state, flaws like wrinkles were fixed by adding 1N/mm2. At a pressure of 1.7 N/mm2, the third state was done. The results show that a product with a blank holder force (BHF) that is neither too high nor too low may be free of defects. When BHF is low, faults in the cylinder cup look like wrinkles, and when BHF is too high, the cylinder cup breaks. So, the BHF value should change depending on the material, thickness, and nature of the product.