Title:
【発明の名称】被扱き面を有する加工素材
Document Type and Number:
Japanese Patent JP2926217
Kind Code:
B2
Abstract:
A metallic workpiece has a to-be-ironed section to be shaped by means of a punch member. The to-be-ironed section is ironed by moving the punch member in a first direction with a side face of the punch member pressed against the surface of the to-be-ironed section and then moving the punch member in a second direction opposite to the first direction. The to-be-ironed section has a front end situated on the front side with respect to the moving direction of the punch member when the punch member moves in the second direction. Before the workpiece is ironed, a gentle slope for preventing burrs, continuous with the front end of the to-be-ironed section, and a bevel portion are formed on the workpiece. A tilt angle between the gentle slope and a line extending along the surface of the to-be-ironed section is at about 30 DEG . The angle of the bevel portion is at 45 DEG or thereabout. Secured between the gentle slope and the side face of the punch member is a gap, which absorbs a distortion of the metallic structure of the surface portion of the to-be-ironed section formed on the side of the front end thereof as the punch member moves in the second direction.
Inventors:
MAEDA AKIHIRO
ARAKI KUNIHIKO
ARAKI KUNIHIKO
Application Number:
JP3815796A
Publication Date:
July 28, 1999
Filing Date:
February 26, 1996
Export Citation:
Assignee:
HEIAN SEISAKUSHO KK
MITSUBISHI JIDOSHA KOGYO KK
MITSUBISHI JIDOSHA KOGYO KK
International Classes:
B21D22/30; B21D28/16; B21K1/30; B21D22/28; B24B39/00; (IPC1-7): B21D22/30; B21D22/28; B21K1/30
Domestic Patent References:
| JP62263828A | ||||
| JP6153141B2 | ||||
| JP6153142B2 |
Attorney, Agent or Firm:
Takehiko Suzue