Design and machining method of automobile closed section structural member with multiple cavities and variable wall thickness

Abstract

The invention discloses a design and machining method of an automobile closed section structural member with multiple cavities and variable wall thickness, and belongs to the technical field of forming. The closed cross section structural member adopts at least two pipe fittings which are combined and fixedly connected in a mechanical connection mode to form a closed cross section with two or more internal cavities; the structural member is made of a variable-thickness steel material for rolling and hot stamping, and different pipe fittings forming the closed-section structural member have variable-wall-thickness design and the same bending curvature in the length direction of the part; at least three equal-thickness intervals are included, and thickness transition sections are arranged between the equal-thickness intervals; machining and forming are carried out by adopting an online induction quenching strengthening process; different pipe fittings forming the closed-section structural member can be differentiated and modularly designed in the aspects of section thickness and section shape according to design and functions, and high-performance design and low-cost manufacturing of the closed-section structural member are achieved. The invention can be widely applied to the field of design and processing of various closed-section structural members.

Description

technical field [0001] The invention belongs to the technical field of forming of mechanical components, and in particular relates to a design and processing method of a closed-section structural part for automobiles. Background technique [0002] Lightweight is a hot spot in the automotive industry. The main factors affecting the level of structural lightweight include structure (section), thickness and material strength. [0003] The section design determines the basic structural properties of the member, and the closed section has better section mechanical properties than the open section. [0004] Generally speaking, the structural performance of complex cross-section components with multi-cavity cross-section design is better than that of simple cross-section components such as rectangles and circles with a single cavity, so it has a better lightweight effect. [0005] There are usually differences in the loads borne by different positions of structural parts during se...

AI Technical Summary

Problems solved by technology

The above-mentioned structural parts mostly adopt the roll forming process, and their cross-sectional types are limited to rectangular, B-shaped or Japanese-shaped, and when processing ultra-high-strength (>1200MPa) materials, it cannot effectively solve the springback and bending of the steel plate. wrinkle and other issues, the lightweight level needs to be improved

Images