Title:
円筒部材の製造方法、及び円筒部材の製造装置
Document Type and Number:
Japanese Patent JP4491958
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent a shoulder part of a cylindrical member from being thinned and folded. SOLUTION: Since forming rollers 30 and 40 are moved from an opening end side of a cylindrical part 52 of a cup-shaped member 50 to a bottom part 51 side in the direction of the arrow (a) to approach the material on the outer circumferential surface side of the cylindrical part 52 to the shoulder part 53, the wall thickness of the shoulder part 53 is thickened to prevent the part 53 from being thined. Further, since a regulating part 22 located on the outer side of a ridge part 13 of a mandrel 10 is provided on a holding surface 21 of a fixing means to regulate the flow of the material approached to the shoulder part 53 and reduce the differential speed between the internal and external materials of the ridge part 13 in the vicinity of a root part 54, the occurrence of folding caused by the large differential speed can be prevented.
Inventors:
Fukukawa Osamu
Masaki Nakajima
Hideyuki Nagai
Takehiko Adachi
Masaki Nakajima
Hideyuki Nagai
Takehiko Adachi
Application Number:
JP2000353637A
Publication Date:
June 30, 2010
Filing Date:
November 20, 2000
Export Citation:
Assignee:
Aisin AW Co., Ltd.
International Classes:
B21D22/16; B21H1/04; B21D51/18
Domestic Patent References:
| JP60187433A | ||||
| JP10511312A | ||||
| JP8300083A | ||||
| JP6023461A | ||||
| JP9225574A | ||||
| JP8174125A |
Attorney, Agent or Firm:
Kazuo Chikajima
Shinji Aida
Shinji Aida