韩文峰,揭招财,HANDISO Selamu,等.汽车后地板拉延件成形裕度提升及参数优化研究[J].精密成形工程,2023,15(12):157-164.
HAN Wen-feng,JIE Zhao-cai,HANDISO Selamu,et al.Forming Margin Improvement and Parameter Optimization of Automotive Rear Floor Drawing Part[J].Journal of Netshape Forming Engineering,2023,15(12):157-164. |
| 汽车后地板拉延件成形裕度提升及参数优化研究 |
| Forming Margin Improvement and Parameter Optimization of Automotive Rear Floor Drawing Part |
| 投稿时间：2023-07-05 |
| DOI：10.3969/j.issn.1674-6457.2023.12.018 |
| 中文关键词: 后地板拉延件 数值模拟 全场网格应变测量 成形裕度 拉延筋 |
| 英文关键词: rear floor drawing part numerical simulation full-field grid strain measurement forming margin draw bead |
| 基金项目:天津市教委科研计划(2020KJ106);天津市研究生科研创新项目(2022SKYZ159) |
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| 中文摘要: |
| 目的 提升拉延工艺处理后汽车后地板零件的成形裕度，优化成形参数。方法 首先，设置初始拉延工艺参数:压边力为807 kN、摩擦因数为0.135、压边圈行程为205 mm、成形力为3 572 kN，基于Autoform软件对后地板的拉延工艺进行数值模拟。其次，利用全场网格应变测量技术对试冲件进行全场测量，获得全场成形裕度云图、成形极限图、减薄云图。最后，调节压边力与拉延筋深度及圆角半径，优化拉延工艺的成形参数。结果 通过模拟获得了零件的潜在风险区域位置，零件的最大减薄率为24.10%、全场成形裕度均小于10%;测量结果表明，最大成形裕度为−9.29%。对风险区域进行模具圆角抛光后，最大成形裕度达到−10.65%。通过综合分析测量结果与模拟结果可知，采用压边力为782 kN、B处拉延筋圆角半径为4.5 mm、拉延筋深度为4.5 mm等成形参数，试冲得到的零件无开裂和起皱缺陷，成形裕度最大值为−14.33%，满足大规模生产需要。结论 利用数值模拟结合全场网格应变测量技术指导修模作业并优化工艺参数，可以有效提升模具的调试效率。 |
| 英文摘要: |
| 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 margin cloud image, forming limit diagram and thinning cloud image were obtained. Finally, the forming parameters of the drawing process were optimized by adjusting the blank holding force, the depth and radius of the draw bead. The potential risk areas of the forming margin were obtained by simulation and the maximum thinning rate of the parts 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 radius of the risk area was polished, the maximum forming margin reached −10.65%. After comprehensive analysis of the measurement results and simulation results, with the blank holding force as 782 kN, the radius of draw bead B as 4.5 mm and the depth of draw bead B as 4.5 mm, the part without cracking and wrinkling defects was obtained, and the maximum forming margin was −14.33%, which met the needs of large-scale production. The numerical simulation combined with the full-field grid strain measurement technology can guide the die repair operation and forming parameters optimization, which can improve the commissioning efficiency of die. |
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