骨格部品のプレス成形方法、及び、それにより製造された車両用骨格部品

Title:

骨格部品のプレス成形方法、及び、それにより製造された車両用骨格部品

Document Type and Number:

Japanese Patent JP4962114

Kind Code:

B2

Abstract:

To provide a method for press-forming a metal sheet at low costs, which can enhance the forming limit causing cracks in the metal sheet without the need of modifying the configuration of press forming tools such as a punch and a die or changing the configuration and/or material kind of a blank to a special one, and is easily applicable to a commercial press forming machine.

The invented method uses the press forming tools such as the punch 10, die 20 and blank holder 30, of which the surface roughness is 7.5 μm or less in terms of the arithmetic mean roughness Ra, and uses a liquid as a lubricant 50, of which the kinetic viscosity is 500 mm2/s or less at 40°C. The liquid is fed into spaces between the metal sheet 100 and the blank holder 30, between the metal sheet 100 and the punch 10, and between the metal sheet 100 and the die 20. In the course of press forming, the press forming tools are once separated from the metal sheet 100, and then press forming is restarted so that formability is improved.

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Inventors:

Yoshikiyo Tamai
Yuji Yamazaki
Akihide Yoshitake

Application Number:

JP2007112990A

Publication Date:

June 27, 2012

Filing Date:

April 23, 2007

Export Citation:

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Assignee:

jfe Steel Corporation

International Classes:

B21D24/10; B21D22/20; B21D22/22; B21D37/18; B21D53/88

Domestic Patent References:

JP2005199319A
JP2005199318A
JP2002066659A
JP10085872A
JP2000017285A

Attorney, Agent or Firm:

Satoshi Takaya
Keisuke Matsuyama
Tsuyoshi Makino

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