公开(公告)号：US20220097118A1

公开(公告)日：2022-03-31

申请号：US17426912

申请日：2019-07-18

Applicant: NIPPON STEEL CORPORATION

Inventor： Atsushi SUGAMA ,  Takatsugu KITORA

IPC: B21D28/26 ,  C21D9/40 ,  C21D9/32

Abstract: Provided is a method for manufacturing a tubular rotary component from a donut-shaped metal disc, wherein the generation of wrinkles or cracks due to a drawing process can be suppressed. This method for manufacturing a tubular rotary component 100B includes: an intermediate molding step in which the entirety of both surfaces of a donut-shaped metal disc 100 having a prescribed inner diameter D1 and outer diameter D2 are pressed by the respective tapered surfaces of a punch 10A and a die 20A provided with a prescribed taper to carry out bore-expansion drawing, thereby obtaining a frustoconical intermediate molded article 100A; and a final molding step in which the intermediate molded article 100A is pressed by a punch 10B and a die 20B having a desired shape to carry out bore-expansion drawing again, thereby obtaining a tubular rotary component 100B.

公开(公告)号：US20240342785A1

公开(公告)日：2024-10-17

申请号：US18752897

申请日：2024-06-25

Applicant: NIPPON STEEL CORPORATION

Inventor： Atsushi SUGAMA ,  Takatsugu KITORA

IPC: B21D31/00 ,  B21D24/00 ,  B21D53/10 ,  C21D9/40

CPC classification number: B21D31/005 ,  B21D24/00 ,  B21D24/005 ,  B21D53/10 ,  C21D9/40

Abstract: Provided is a method for manufacturing a tubular rotary component from a donut-shaped metal disc, wherein the generation of wrinkles or cracks due to a drawing process can be suppressed. This method for manufacturing a tubular rotary component 100B includes: an intermediate molding step in which the entirety of both surfaces of a donut-shaped metal disc 100 having a prescribed inner diameter D1 and outer diameter D2 are pressed by the respective tapered surfaces of a punch 10A and a die 20A provided with a prescribed taper to carry out bore-expansion drawing, thereby obtaining a frustoconical intermediate molded article 100A; and a final molding step in which the intermediate molded article 100A is pressed by a punch 10B and a die 20B having a desired shape to carry out bore-expansion drawing again, thereby obtaining a tubular rotary component 100B.