Title:
【発明の名称】張出し成形加工方法
Document Type and Number:
Japanese Patent JP2790813
Kind Code:
B2
Abstract:
PURPOSE:To improve the freedom and quality of forming by providing one or more fluid orifices on a top panel of a punch and making pressure fluid flow continuously, temporarily or intermittently out of the orifice or orifices during forming operation. CONSTITUTION:One or more small fluid orifices 5 are formed on the top panel 1a of the punch 1 and connected with a pressure fluid supply source 8 through a guide hole 6 and a valve 7. When a forming sheet stock 4 is put between a die 2 and a blank holder 3 and formed by a punch 1 and a die 2, pressure fluid is forced out of fluid orifices 5 toward the upper direction of the top panel 1a and forming is conducted while the friction resistance between the top panel 1a and the base sheet 4 is reduced. At this time, the state of a strain distribution of the sheet stock 4 shows large quantities of deformation both in the shoulder part and the top part 1a of the punch 1. As a result, uniform strain distribution is obtained in a large range of the sheet stock 4, forming freedom is improved and forming quality, too, is uniformized and improved.
Inventors:
SAKAGUCHI MASASHI
YAMANOI TOMOAKI
KAWAI HIDEO
TAKADA SUSUMU
YAMANOI TOMOAKI
KAWAI HIDEO
TAKADA SUSUMU
Application Number:
JP16747588A
Publication Date:
August 27, 1998
Filing Date:
July 05, 1988
Export Citation:
Assignee:
SHOWA ARUMINIUMU KK
International Classes:
B21D22/20; B21D22/26; B21D24/00; B21D26/021; B21D26/031; (IPC1-7): B21D22/20; B21D24/00; B21D26/02
Domestic Patent References:
| JP62234624A | ||||
| JP614824U |
Attorney, Agent or Firm:
Hisayoshi Shimizu