李倩,陶现宾,胡德友,等.运载火箭薄壁锐角型材框弯曲成形工艺[J].精密成形工程,2025,17(4):243-250.
LI Qian,TAO Xianbin,HU Deyou,et al.Bending Forming Process of Thin-walled Acute Angle Profile Frame for Carrier Rocket[J].Journal of Netshape Forming Engineering,2025,17(4):243-250. |
| 运载火箭薄壁锐角型材框弯曲成形工艺 |
| Bending Forming Process of Thin-walled Acute Angle Profile Frame for Carrier Rocket |
| 投稿时间：2024-09-30 |
| DOI：10.3969/j.issn.1674-6457.2025.04.024 |
| 中文关键词: 薄壁锐角型材框 回弹量 拉弯成形 工艺参数 拉伸量 |
| 英文关键词: thin-walled acute angle profile frame rebound amount stretch bending forming process parameters amount of stretch |
| 基金项目:航天一院课题项目(Z-Y32112-53) |
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| 中文摘要: |
| 目的 解决某一运载火箭整流罩薄壁锐角型材框零件拉弯后弧度回弹和成形精度差的问题。方法 对拉弯模具进行修模试验，在不同工艺参数下对零件进行拉弯试验，分析模具回弹量及工艺参数对零件成形精度的影响规律，得出优化的拉弯工艺参数。结果 由修模试验可知，模具半径越小，拉弯后弧度间隙越小，槽口越浅，拉弯后角度间隙越小，模具半径回弹量为1.5%，槽口深度回弹量为−0.2 mm。由拉弯试验可知，减小预拉包角，增加预拉伸量，对零件的平度和角度影响较大，对弧度影响较小;增加补拉量，对零件的平度和角度影响较小，对弧度影响较大。优化的拉弯工艺参数如下:预拉力为2 t，预拉包角为50°，补拉预拉伸量为35 mm，补拉包角为75°，补拉伸量为50 mm。结论 修整模具半径和槽口深度回弹量及采用合理的拉弯工艺参数可有效提高零件成形精度。 |
| 英文摘要: |
| The work aims to solve the problem of arc rebound and poor forming accuracy after stretch-wrap bending of a thin-walled acute angle profile frame part of a carrier rocket fairing. The tensile bending die was repaired and the parts were tested under different process parameters. The effect of the die rebound and process parameters on the forming accuracy of the parts was analyzed, and the optimized tensile bending process parameters were obtained. Through the repair test, it was concluded that the smaller the mold radius, the smaller the arc gap, the shallower the notch, the smaller the angle gap and the rebound of the mold radius was 1.5%, and the rebound of the notch depth was −0.2 mm. Through the tensile bending test, it was concluded that reducing the predrawing angle and increasing the predrawing amount had a great impact on the flatness and angle of the part, but a little impact on the radian. Increasing the amount of filling and drawing had a little impact on the flatness and angle of the part, but had a great impact on the radian. The optimized stretch bending parameters were obtained, the pretension was 2 t, the predrawing angle was 50°, the predrawing amount was 35 mm, the predrawn angle was 75°, and the predrawn amount was 50 mm. It can effectively improve the forming accuracy of parts by adjusting the radius of the die and the depth of the notch and adopting reasonable stretching and bending process parameters. |
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