| 摘要 |
PURPOSE:To manufacture a titled disk from a material whose ductility is low, by executing the first forming of a dome-like projecting part having a specified diameter and radius of curvature by drawing using a male die and a female die, forming a rough shape body for a disk by means of the second and third forming by a punch, and finish-drawing it by the male die and the female die. CONSTITUTION:A high tension steel plate 1 is drawn by a punch 3 and a die 4, and the first forming is executed so that a dome-like projecting part 2 having a diameter D0 and a radius of curvature P becomes 1/5<=P/D0<=1. This dome-like projecting part 2 is placed on a supporting base 5 so as to be turned upward, the center of the top part is pressed to the inside surface side by a punch 6, and a rough recessed surface 7 corresponding to a recessed surface on the outside surface of a disk, which becomes the second part 8. It is turned inside out, is supported by a supporting base 12, and a rough shape body for a disk 15 is obtained by pressing the rough recessed surface 7 from the back surface by a punch 14. This rough shape body 15 is finish-formed by a pressing punch 19 and a die 20 of a conventional method. |
