Press forming method
AssigneeHonda Motor Co., Ltd.
InventorsKenji Matsutani, Hirokatsu Akiba, Takeshi Sano, Yoshitake Omiya
Life of this patent
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Abstract
This press forming method includes a first drawing step for forming a first drawn step portion, a second drawing step for forming a second drawn step portion, and a finishing step for completing a stepped portion. In the first drawing step, a first outside curved portion is formed to the outside of a second outside curved portion with respect to an extension region of a character line, and a first parallel portion is formed to the same depth as the drawn depth of a second parallel portion. In the second drawing step, a second inside curved portion having a greater curvature than a first inside curved portion is formed.
Claims6
A press forming method for forming a stepped portion on an end part of a main body portion including a character line, the press forming method comprising:
- a first drawing step of forming, by a first drawing process, a first drawn stepped portion from a workpiece including the character line, the first drawn stepped portion including a first inclined portion connected to the main body portion via a first outside curved portion, and a first parallel portion connected to the first inclined portion via a first inside curved portion and extending in parallel with the main body portion;
- after the first drawing step, a second drawing step of forming, by a second drawing process, a second drawn stepped portion from the first drawn stepped portion, the second drawn stepped portion including a second inclined portion connected to the main body portion via a second outside curved portion, and a second parallel portion connected to the second inclined portion via a second inside curved portion and extending in parallel with the main body portion;
- and
- after the second drawing step, a finishing step of finishing the stepped portion, wherein
- in the first drawing step, in an extended region positioned on an extension line of the character line, the first outside curved portion is formed on a more outer side than the second outside curved portion, and the first parallel portion is formed at a same depth as a drawing depth of the second parallel portion, and
- in the second drawing step, the second inside curved portion having a greater curvature than that of the first inside curved portion is formed in the extended region.
Dependencies are inferred from the claim text.