Title:
PUNCHING METHOD IN HYDRAULIC BULGE FORMING OF CYLINDRICAL MEMBER
Document Type and Number:
Japanese Patent JP3738884
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a punching method by which an efficient and small shear- drop punching is carried out on a cylindrical member during a stage in which hydraulic bulge forming of the cylindrical member is carried out.
SOLUTION: In the punching method of the cylindrical member which is made by working a long size extruded shaped material into a specified dimension is carried out when the hydraulic bulge forming is carried out or successively after the hydraulic bulge forming is carried out, after beforehand forming a slender embossed part by the hydraulic bulge forming around a part to be punched where is formed in a prescribed position of a surface to be worked, the punching is carried out by making the longitudinal direction of the embossed part coincide with the direction of a shear angle which is formed at both ends of the longitudinal section of a punching punch.
More Like This:
Inventors:
Shigeyuki Nakagawa
Kenji Kanamori
Hisao Tanikawa
Kimio Ito
Kenji Kanamori
Hisao Tanikawa
Kimio Ito
Application Number:
JP35318899A
Publication Date:
January 25, 2006
Filing Date:
December 13, 1999
Export Citation:
Assignee:
Nissan Motor Co., Ltd
Mitsubishi Aluminum Co., Ltd.
Mitsubishi Aluminum Co., Ltd.
International Classes:
B21D28/28; B21D26/033; B21D26/035; B21D26/047; B21D28/24; (IPC1-7): B21D28/28; B21D26/02; B21D28/24
Domestic Patent References:
| JP57146913U | ||||
| JP5013628U |
Attorney, Agent or Firm:
Yasuo Ishikawa
Previous Patent: METHOD FOR COMPENSATING DEAD TIME OF VOLTAGE PWM INVERTER
Next Patent: FILTER PRESS USING METALLIC FILTER MEDIUM
Next Patent: FILTER PRESS USING METALLIC FILTER MEDIUM