Preform, hydroforming method, and hydroformed product

A preform, hydroforming technology, applied in the superstructure sub-assembly, cantilever mounted on the pivot, the superstructure, etc., can solve the problems of stable strength and quality of hydroformed products and excellent difficulties.
CN1754632AInactive Publication Date: 2006-04-05NISSAN MOTOR CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
NISSAN MOTOR CO LTD
Publication Date
2006-04-05
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention provides a pre-molding body, which has edges which are overlapped and jointed with each other. The invention also includes a first external component and a second external component used for forming the outer surface of the hydraulic-pressure molded product; and a reinforcing component, which is jointed to the first external component and the second external component so as to form reinforcing ribs. The reinforcing ribs partitions the hollow cross section of the outer surface. The reinforcing component has such sizes which can restrain the stretch along the tensile force direction; the stretch is due to the tensile force produced during the hydraulic-pressure molding.
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Description

technical field

[0001] The present invention relates to preforms, methods of hydroforming, and hydroformed articles. Background technique

[0002] Typical automotive body structural members, such as side sill members, have a hollow structure to improve the absorption capacity of collision shocks, and the hollow structure is provided with internal reinforcement members to enhance its strength, which is used as a typical hydraulic pressure for car body structural members Shaped articles are produced by supplying hydraulic pressure to the inside of a preform having two outer members and a reinforcing member (for example, see Japanese Nos. 2003-320960 and 2004-82142) to expand and deform it. Pending Patent Application Bulletin). Contents of the invention

[0003] However, the reinforcement ribs are formed by the linear expansion of the reinforcement member without any inflow of matter, unlike the case of the outer member, so that the chances of the reinforcement member breaki...

Claims

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