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US 11,413,673 B2Granted
Manufacturing method of body frame and body frame
AssigneeHonda Motor Co., Ltd.
InventorsSeiji Hayashi, Yoshitaka Okitsu, Akira Takikawa
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Abstract
A manufacturing method of a body frame includes a pre-strain step of press molding a wavy shape portion in the body frame to apply pre-strain after any press molding to mold the body frame.
Claims8
A manufacturing method of a body frame molded by press molding performed once or more times, wherein
- the body frame has a cross-sectional structure closed by joining a predetermined part, and the body frame is formed in a cross-sectional hat shape extending in a predetermined direction and functioning as a framework part or a reinforcing part of the vehicle, and wherein
- the manufacturing method comprises a pre-strain step of press molding a wavy shape portion in the body frame to apply pre-strain satisfying a target withstand load for the body frame, at a center portion of the body frame in a longitudinal direction of the body frame and at a region apart from opposite end portions in the longitudinal direction of the body frame, after any press molding.
A manufacturing method of a body frame molded by press molding, wherein
- a pre-strain step of press molding a wavy shape portion in the body frame to apply pre-strain is performed after any press molding,
- the wavy shape portion is set with a bend radius based on a plate thickness of the body frame in a range of a predetermined lower limit or more,
- the wavy shape portion is provided in a region where residual strain generated by the press molding performed once or more times is relatively small,
- the wavy shape portion is provided in at least one of a region where a ridgeline that the body frame has is avoided, a pressed surface pressed during the press molding, and a side surface bent from the pressed surface, and
- the pre-strain is within a range of plastic strain to increase yield stress of a press-molded product that forms the body frame.
2 more elements
A body frame molded by press molding, the body frame being provided with a wavy shape portion to apply pre-strain in a range of plastic strain to increase yield stress of a press-molded product that forms the body frame, wherein
- the wavy shape portion is set with a bend radius based on a plate thickness of the body frame in a range of a predetermined lower limit or more,
- the wavy shape portion is provided in a region where residual strain generated by the press molding performed once or more times is relatively small,
- the wavy shape portion is provided in at least one of a region where a ridgeline that the body frame has is avoided, a pressed surface pressed during the press molding, and a side surface bent from the pressed surface, and
- a wave of the wavy shape portion extends in at least one of a longitudinal direction of the body frame and a direction orthogonal to the longitudinal direction.
1 more element
Dependencies are inferred from the claim text.