Working method of collision energy absorption box with rotary folding concave corners

Abstract

The invention discloses a working method of a collision energy absorption box with rotary folding concave corners. The collision energy absorption box is composed of a plurality of three-dimensional energy absorption areas and folding energy absorption areas which are arranged in a crossed mode from top to bottom, wherein the three-dimensional energy absorption area is a thin-wall pipe fitting with a polygonal section; and the folding energy absorption area is composed of circumferentially arranged rotary folding concave corners which are formed by introducing crease lines. In the collision process, the rotary folding concave corners of the folding energy absorption area are compressed and deformed in advance under the action of loads to achieve first-stage buffering; and then the three-dimensional energy absorption area is compressed and deformed to finish absorption and dissipation of main body collision energy and achieve second-stage buffering. By means of two-stage buffering of the collision energy absorption box, the initial peak force in the collision process can be effectively reduced, and it can be guaranteed that the collision energy absorption box has a high energy absorption rate. Meanwhile, due to the existence of the rotary folding concave corners, the collision energy absorption box has a stable deformation mode and good defect resistance.

Description

technical field [0001] The invention relates to the technical field of automobile collision safety, in particular to a working method of a collision energy-absorbing box with a rotary folding concave angle. Background technique [0002] The crashworthiness of automobiles is one of the important indicators of automobile safety performance. At present, people usually install crash absorbing boxes of different structures on the parts of the car that are prone to collision, so as to effectively absorb the huge impact energy generated during the collision. The common crash absorber is a thin-walled structural pipe made of metal, which absorbs and dissipates the impact energy through the deformation of the thin-walled structural pipe, thereby ensuring the safety of the main structure of the car and the occupants of the car. [0003] The crashworthiness of crash-absorbing boxes is usually judged by the following indicators: (1) It has a low peak load to ensure that the force trans...

AI Technical Summary

Problems solved by technology

However, considering the complex working conditions such as fast impact speed and uncertain impact load (maybe a frontal collision or an offset collision) during a car collision, the crash box also needs to have a good ability to resist defects.

[0004] In the actual collision process, the energy-absorbing effect of the existing crash-absorbing box is limited, and there are the following problems:

However, under the influence of geometric defects in this crease pattern, the sharp corners of the diamond concave corners are more sensitive to defects, and there are structural stability problems

[0006] 2. In order to overcome the shortcoming of the unstable deformation mode of the crash box, a small number of existing technologies achieve this goal by adding constraints, such as the publication number CN102700618A, titled "A thin-walled energy Absorber tube" patent, in which the diaphragms that act as reinforcements are arranged at certain intervals inside the thin-walled tube

Due to the additional built-in structure added to the thin-walled energy absorption tube and the precise connection with the thin-walled tube, it brings difficulty to the processing technology

[0007] 3. In the actual collision process, there will be more complex load conditions, and the existing crash energy-absorbing box structure has the disadvantage of weak defect resistance, and cannot cope with complex collision loads

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