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| 筒形件充液热拉深及冷却对性能影响的研究 |
| The Effect of Warm Hydroforming and Cooling on the Properties of Hydroformed Part |
| Received:January 02, 2015 Revised:March 10, 2015 |
| DOI：10.3969/j.issn.1674-6457.2015.02.006 |
| 中文关键词: 充液热拉深 7075 铝合金 力学性能 微观组织 |
| 英文关键词: warm hydroforming 7075 aluminum alloy mechanical property microstructure |
| 基金项目:国家自然科学基金资助项目(1175024) |
| Author Name | Affiliation | | YANG Xi-ying | School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China | | LANG Li-hui | School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China | | LIU Kang-ning | School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China | | ZHANG Wen-shang | School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China |
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| 中文摘要: |
| 目的 研究筒形件充液热拉深及冷却对性能影响。方法 在自主开发的RJ50 实验机上进行了7075 筒形件充液热拉深实验。在210 ℃下,对不同成形缺陷及影响因素进行了分析,并对成形的零件选择两种冷却介质进行冷却,并研究了宏观力学性能及微观组织演化。结果 与温热成形相比,充液热拉深零件具有更高的尺寸精度;在充液热拉深条件下,水冷较空冷对筒形件成形后屈服强度及强度极限有轻微提高,对延伸率影响不大,水冷导致的第二相粒子要比空冷多,但水冷致晶粒粗化缓慢。结论 充液热拉深可以显著提高零件的尺寸精度;充液热拉深后并及时冷却的方法,在维持材料力学性能及防止材料劣化方面是有利的。 |
| 英文摘要: |
| The aim of this study was to investigate warm hydroforming and the influence of cooling on macro and micro properties of hydroformed part. The cylindrical cup warm hydroforming of 7075 aluminum alloy sheet was carried out on a self-developed YRJ50 test machine. The different forming defects and influencing processing parameters were analyzed at 210 ℃. The macro and micro properties of hydroformed parts cooled using two different cooling media were also investigated. The warm hydroformed part had higher dimensional precision than the warm formed part. Under the condition of warm sheet hydroforming with thereafter rapid cooling, the yield stress and ultimate strength were slightly increased by water cooling as compared to air cooling, while the influence on elongation at fracture was little between the two cooling modes. The second-phase particles caused by water cooling were more than those by air cooling, but water cooling led to slow roughening of grain. Warm hydroforming could significantly increase the dimensional accuracy of hydroformed parts. Timely water cooling after warm sheet hydroforming was beneficial for maintaining material mechanical properties and preventing deterioration. |
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