19–22 Jun 2023
House of Culture, Luleå, Sweden
Europe/Vienna timezone

Study of the Influence of part features of AHSS A-pillar on springback and its robustness

21 Jun 2023, 09:50
20m
1. Lilla Salen (Kulturens hus Luleå)

1. Lilla Salen

Kulturens hus Luleå

Oral Presentation Springback, shape accuracy, geometry assurance, and surface quality SPRINGBACK, SHAPE ACCURACY, GEOMETRY ASSURANCE, AND SURFACE QUALITY

Speaker

Chao Niu (Baosteel)

Description

In this paper, the AUTOFORM stamping simulation software is used to analyze the formability and springback of A pillar part, and the influence of part features on springback and its robustness was studied. The results show that when stamped with the third generation advanced high strength steel QP1180, the maximum local thinning rate of the part is 0.157 without cracking risk. And the maximum springback value is negative 9.58mm at the part end while the value is positive 3.54mm in the middle area. In addition, the A pillar part can be decomposed into straight sections and arc sections along the longitudinal, and the springback of this two sections are analyzed separately, where it can be seen that the twisted springback mainly appears in the arc section while the springback at the linear section is small, and the main reason for the overall distortion comes from the arc section. After adding features through the angular edges along the longitudinal direction, the maximum springback at the part end drops from 5.522mm to 1.664mm, and the maximum springback in the middle drops from 2.365mm to 0.939mm. The robustness analysis of this part considering the material yield strength, tensile strength, plastic strain ratio, compression force, friction coefficient and other process parameters around 10% were also analyzed, the results show that the maximum springback is strongly related to material yield strength, and the robustness is improved greatly after adding part features. It can be used as an effective measure to improve the mass production of ultra high strength steel parts due to material performance fluctuations.

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