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| 基于模具创新设计的高强钛管小半径加热绕弯扁化控制 |
| Control of Sectional Flattening in Heat-Assisted Rotary Draw Bending of High- Strength Titanium Tubes with Small-Radius Based on Innovative Design of Die |
| Received:July 18, 2021 |
| DOI：10.3969/j.issn.1674-6457.2022.01.011 |
| 中文关键词: 管材加热绕弯成形 截面扁化 反变形压力模 勺形芯模 柔性芯模 |
| 英文关键词: rotary draw bending of heat-assisted tube sectional flattening anti-deformation pressure die spoon-shape mandrel flexible mandrel |
| 基金项目:国家自然科学基金(51522509) |
| Author Name | Affiliation | | LIN Yao-chen | Zhejiang Key Laboratory of Aerospace Metal Tube Forming Technology and Equipment, Lishui 321403, China | | ZENG Yuan-song | AVIC Manufacturing Technology Institute, Beijing 100024, China | | WU Wei | AVIC Manufacturing Technology Institute, Beijing 100024, China | | LIN Wei-ming | King-Mazon Machinery Co., Ltd., Lishui 321403, China | | LYU Feng-gong | AVIC Manufacturing Technology Institute, Beijing 100024, China | | JIN Feng-zhen | State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China | | LI Heng | State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China |
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| 中文摘要: |
| 目的 发展小直径高强钛管小弯曲半径(R=1.5D)加热弯曲成形的截面扁化缺陷控制技术。方法 基于对管材弯曲前预变形和弯曲过程中施加有效约束的原理，设计变曲率型腔的反变形压力模结构、勺形芯模结构和带芯球的柔性芯模结构，结合有限元仿真分析，研究探索不同模具结构设计对弯管截面扁化的影响。结果 与“压力模+圆形芯棒”模具组合相比，使用反变形压力模可以将最大截面扁化率降低9%~21%;与传统模具组合下的最优扁化率(6.19%)相比，反变形压力模结合勺形芯模和带芯球的芯模可进一步将扁化率降低24%~33%，最优扁化率为3.9%。结论 反变形压力模和勺形芯模带芯球的芯模相结合的模具结构设计，有效解决了小直径高强钛管小弯曲半径成形的截面扁化问题，将扁化率控制在4%以内。 |
| 英文摘要: |
| The work aims to develop an effective strategy to control the severe sectional flattening defect in heat-assisted tight-radius (R=1.5D) bending process for small-diameter high-strength titanium tubes. Based on the principle of pre-deformation before bending together with tooling constraints during bending, the anti-deformation pressure die with a varying cavity, the spoon-shape mandrel, and the mandrel with a flexible ball were designed. The effects of different tooling structures on the sectional flattening were studied in combination with finite element simulation. Compared with the tooling of “pressure die + circular mandrel”, using anti-deformation pressure die could reduce the maximum flattening degree by about 9%-21%. Compared with the best flattening degree of 6.19% obtained under conventional tooling, applying the anti-deformation pressure die in conjunction with the spoon-shape mandrel or mandrel with a flexible ball could decrease the flattening degree by about 24%-33%, achieving a very low flattening degree of 3.9%. The die structure design combining anti-deformation pressure die and the spoon-shape mandrel or mandrel with a flexible ball effectively solves the flattening defects and controls the rate of flattening within 4%. |
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