Research on Forming Margin Improvement and Parameter Optimization of Automobile Rear Floor Drawing Parts

summary: Objective To improve the forming margin of the rear floor parts of automobiles after drawing process and optimize the forming parameters. Methods Firstly, the initial drawing process parameters were set as follows: blank holder force of 807 kN, friction coefficient of 0.135, blank holder stroke of 205 mm, and forming force of 3 572 kN. The drawing process of the rear floor was numerically simulated based on Autoform software. Secondly, the full-field grid strain measurement technology was used to measure the test parts in the whole field to obtain the full-field forming margin cloud map, forming limit map, and thinning cloud map. Finally, the blank holder force, drawbead depth, and fillet radius were adjusted to optimize the forming parameters of the drawing process. Results The potential risk area position of the part was obtained through simulation. The maximum thinning rate of the part was 24.10%, and the full-field forming margin was less than 10%. The measurement results showed that the maximum forming margin was -9.29%. After the die fillet polishing of the risk area, the maximum forming margin reached -10.65%. Through comprehensive analysis of the measurement results and simulation results, it can be seen that the blank holder force of 782 kN, the radius of the drawbead at B is 4.5 mm, the depth of the drawbead is 4.5 mm, and other forming parameters. The parts obtained by the test punching have no cracking and wrinkling defects, and the forming margin is...

Keywords:

Numerical simulation of rear floor drawing parts Full-field mesh strain measurement Forming margin Drawbead

Category Number:

TG356(Metal pressure processing)

Paper publication date:

2023-12-28

Online publication date:

2023-12-28 (The date of the first online publication on the Wanfang platform does not represent the publication date of the paper)

Number of Pages:

8 (157-164)

Title:Forming Margin Improvement and Parameter Optimization of Automotive Rear Floor Drawing Part

Abstract:The work aims to improve the forming margin of automotive rear floor drawing part and optimize the forming parameters. Firstly, by setting the blank holding force as 807 kN, friction coefficient as 0.135, blank holder stroke as 205 mm, and forming force as 3 572 kN, the drawing process of the rear floor was numerically simulated based on Autoform software. Secondly, full-field grid strain measurement technique was used to measure the actual drawing part, and full-field forming mar-gin cloud image,forming limit diagram and thinning cloud image were obtained.Fina...

Keyword：

rear floor drawing part numerical simulation full-field grid strain measurement forming margin draw bead