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Patent Searching and Data


Title:
METHOD FOR MANUFACTURING SQUARE PIPE-LIKE MOLDED PRODUCT
Document Type and Number:
Japanese Patent JP2012040604
Kind Code:
A
Abstract:

To provide a method for easily manufacturing a square pipe-like molded product having proper shape by molding a pipe-like metal material.

The manufacturing method includes: a preliminary molding step for molding the pipe-like metal material W so as to have the peripheral length substantially the same as that of a square-pipe-like molded product S; a fluid injecting step for injecting a fluid into the metal material W; and a pressurizing molding step for pressurizing the metal material W from the surrounding by using an upper die 3 and a lower die 4, and molding it so as to have a shape corresponding to the cavity surface 8 of the molding die 5 while controlling an internal pressure of the metal material W. In this method, the internal pressure of the metal material W which is controlled in the pressurizing molding step is controlled at a value capable of resisting an external force to be applied to the metal material W to prevent buckling from being generated in the metal material, and is controlled at a value capable of preventing a corner portion of the square pipe-like molded product S from excessively expanding.


Inventors:
KATAOKA JO
Application Number:
JP2010186497A
Publication Date:
March 01, 2012
Filing Date:
August 23, 2010
Export Citation:
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Assignee:
KATAYAMA KOGYO CO LTD
International Classes:
B21D26/041; B21D26/039; B21D26/047
Attorney, Agent or Firm:
Etsushi Kotani
Masataka Otani