
In this manufacturing method for a frame body, after ring rolling a metal material to form a ring-shaped member, a rectangular member is formed by pressing and deforming this ring-shaped member in the radial direction. At this time, an angle of corner portions that impart the rectangular shape to the rectangular member is formed smaller than an angle of the frame body that is to be obtained by die forging the rectangular member. According to the frame body obtained by this manufacturing method f...











