The invention relates to a side wall inner plate of an automobile. The side wall inner plate of the automobile comprises a side wall inner plate body and is characterized in that the upper surface of a column A body is a flange face in lap joint with a top cover, the flange is of a ferrite and pearlite structure with the strength being 500-700 MPa or of a bainite structure. The upper portion of a column B body is a hard area, the lower portion of the column B body is a soft area, and the hard area and the soft area are connected through a first transition area. The main part of the side wall inner plate body is of a martensitic structure obtained through an ultrahigh-strength steel hot forming technology, and the strength of the martensitic structure is 1300-1500 MPa. A side wall inner plate body area located under the soft area of the column B body is a soft area, and the soft area is connected with the main part of the side wall inner plate body through a second transition area. The second transition area is shaped like a belt, and the width of the second transition area is approximately 50 mm. According to the side wall inner plate of the automobile, the flange face in lap joint with the top cover is changed into the soft area, so toughness can be enhanced, and the effect of partial energy absorption can be achieved; the column B part is good in strength and controllable in deformation.
Side wall inner plate of automobile
2015-05-06
Patent
Elektronische Ressource
Englisch
Automobile side wall outer plate forming process method and automobile side wall outer plate
Europäisches Patentamt | 2023
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