Darby & Darby
Manufacturing method for frame body and frame body
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 for a frame body, it is possible to increase the mechanical strength, and in particular, the creep strength. Furthermore, when forming the frame body, the occurrence of defects during manufacture may be restrained, it becomes possible to realize a reduction of the amount of waste metal material and the manufacturing time, and thereby this frame body may be formed inexpensively.
Mitsubishi Materials Corporation
F Y B B Y Y Y
F01D Y10T B23P B21H Y10T Y10T Y10T
inventional additional inventional additional additional additional additional
Hiroaki Kiyoshi Shoichi
Kikuchi Tamaru Takahashi