抄録
Combined effects of forming condition on deep-drawability of square cups were studied. In order to investigate the fundamental deep-drawability, drawing of rectangular shell of steel sheet was carried out under varied deep-drawing condition. (1) As for the thickness of square cups, the reduction of blank holding force and the increase of die-radius cause the increase of the thickness. (2) As for the height of square cups, the increase of blank holding force and the reduction of die-radius cause the increase of the height of cup. (3) the shape of square cups is concerned with the improvement of blank shape. For example good deep-drawing of SPCD sheet could be finished, under the condition of blank holding force 5 (kN), die-radius 6.0 (mm), punch speed 0.5 (mm/sec), and optimum blank shape.
