崔晓磊,张鑫龙.轻质高强异形管件充液压制成形技术[J].精密成形工程,2024,16(7):124-132.
CUI Xiaolei,ZHANG Xinlong.Hydro-pressing Forming Technology for Lightweight and High-strength Tubular Components with Irregular Cross Sections[J].Journal of Netshape Forming Engineering,2024,16(7):124-132. |
| 轻质高强异形管件充液压制成形技术 |
| Hydro-pressing Forming Technology for Lightweight and High-strength Tubular Components with Irregular Cross Sections |
| 投稿时间：2024-06-01 |
| DOI：10.3969/j.issn.1674-6457.2024.07.010 |
| 中文关键词: 充液压制成形 高强度管件 支撑内压 压制力 低载荷 |
| 英文关键词: hydro-pressing forming high-strength tubular component internal supporting pressure pressing force less loading |
| 基金项目:黑龙江省自然科学基金(LH2022E057);国家级重点实验室基金(JCKYS2024603C003，JCKYS2021603C002) |
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| 中文摘要: |
| 目的 针对轻质高强异形管状构件的迫切需求，研发了充液压制成形技术，以在低载荷下成形出具有高强度、大尺寸、小圆角等特征的异形空心薄壁管状构件。方法 给出了充液压制成形的力学原理，建立了成形过程压制力计算模型与临界支撑内压理论模型，分析了充液压制成形过程失稳屈曲/起皱规律、圆角充填机理与壁厚分布规律。结果 当管材充液压制过程所需的支撑内压为内高压成形压力的1/10~1/20时，就可以避免管坯发生失稳屈曲与起皱，同时使压制力大幅降低。在弯曲与压缩应力复合作用下对管坯进行圆角充填，充液压制成形得到的管件壁厚减薄非常小。结论 利用小吨位合模压力机在超低压条件下可以充液压制成形出具有小圆角与均匀壁厚的轻质高强异形管件，解决了传统内高压成形压力高、易发生开裂等难题。 |
| 英文摘要: |
| The work aims to develop a hydro-pressing forming technology to manufacture special-shaped thin-walled tubular components with characteristic such as high strength, large size and small rounded corners under less loading to meet the urgent demand for lightweight and high-strength tubular components with irregular cross sections in the fields of aerospace and new energy vehicles. In this paper, the mechanical principle of hydro-pressing forming was firstly given, and a calculation model of pressing force during forming and the theoretical model of critical supporting pressure were established. Furthermore, the instability buckling/wrinkling behavior, the corner filling mechanism and the wall thickness distribution during the hydro-pressing forming process were analyzed. It was found that the instability buckling and wrinkling of the tube blank could be avoided when the internal supporting pressure was only 1/10-1/20 of the forming pressure required in high-pressure hydroforming, and the pressing force could be greatly reduced. During the hydro-pressing process, the tube blank was deformed under the combined action of bending and compression stress to fill the die corners, and the wall thickness thinning on the tubular component was very small. In conclusion, the lightweight and high-strength special-shaped tubular components with small corners and uniform wall thickness can be shaped by the proposed hydro-pressing forming technology using a small-tonnage press machine under the condition of ultra-low pressure. This solves the problems such as high forming pressure and high splitting defect possibility in traditional high-pressure hydroforming process. |
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