PRODUCTION OF FRAME STRUCTURE

Japanese Patent JP3672408

B2

PROBLEM TO BE SOLVED: To produce a frame structure without welding by selecting a thickness of a round tube based on a product thickness/an elongation percentage, cutting the round tube to a prescribed length, conducting plastic working to a product shape, producing a forming material with joining end parts, charging the forming material into a blow forming die, which regulates an external periphery, and conducting blow-forming with heating.
SOLUTION: A thickness of an aluminum alloy round tube is selected roughly based on (product thickness center peripheral length)×(product thickness)/ (tube thickness center peripheral length). The tube is cut to a prescribed length. The tube is bent with a tube bender to form a shape close to a product shape. The tube is made to a forming material 45 by connecting end parts. The forming material 45 is charged into a blowing forming die 10, which has a cavity regulating an external peripheral face of a product. The forming material 45 is heated to the softening point or higher through under the melting point. A high pressure fluid is blown into the forming material 45 to be subjected to blow forming.

Miyaoka Hiroya
Kiyama Kei
Manabu Maruyama
Yokoyama Township

JP6152297A

July 20, 2005

March 14, 1997

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Honda motor industry stock company

B21D26/033; B21D47/01; B21D53/86; B21D53/88; (IPC1-7): B21D26/02; B21D47/01

JP54099768A
JP61219435A
JP8337182A

Yoichiro Shimoda

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