Experimental and Numerical Study on Warm Hydroforming for T-shape Joint of AZ31 Magnesium Alloy

AZ31合金T形接頭內高壓溫成形工藝的實驗和數值研究

真鍋健一(Ken-Ichi Manabe) ； 藤田幸太(Kota Fujita) ； 多田一夫(Kazuo Tad)

《中國機械工程學刊》 31卷4期 (2010/08) Pp. 281-287

https://doi.org/10.29979/JCSME.201008.0002

摘要

本文對AZ31鎂合金管低溫溫成形的可能性進行了嘗試。T形接頭的成形工藝是被公認為典型管材內高壓成型工藝。本研究利用矽油作為內高壓成形介質，使用重新改造的內高壓成形設備對AZ31合金管的T形接頭成形工藝進行了數值和實驗研究。實驗過程使用的是以前利用智慧系統開發的一個適合於T形接頭成形的載入路徑。結果表明，T形AZ31合金接頭利用250℃下的內高壓成形過程完全可以實現。這個溫度比以前用氣體作為介質的溫成形工藝的溫度低了150℃。由於使用的變形溫度較低，得到的T形接頭的表面品質明顯好於400℃下得到的T形接頭。另外，本文還研究了AZ31合金室溫下的冷成形工藝，結果表明，AZ31合金室溫下的冷成形很難實現。除此之外，通過比較模擬和實驗結果可以看出，T形接頭成形工藝的FE模型和以前開發的智慧內高壓成形系統是非常實用的。

並列摘要

In this study, the possibility of low-temperature warm forming is attempted for the AZ31 magnesium alloy tube. For this purpose, T-shape joint (T-joint) forming is dealt with as a typical tube hydroforming process using silicon oil as the pressure medium, and a renewed T-joint warm forming machine system is manufactured and then numerical and experimental works are carried out. A suitable loading path determined using the virtual intelligent forming system developed previously is used in carrying out T-joint forming experiments. As a result, it is verified that a warm tube hydroforming (THF) process for the T-joint of an AZ31 magnesium alloy tube can be achieved successfully at 250℃, which is more than 150℃ lower than the temperature in the former warm T-joint forming with gas pressure. The surface quality of the T-joint formed at 250℃ is better than that of the previous ones formed at 400℃ because of the low forming temperature. In addition, the cold THF process of the AZ31 tube at room temperature is confirmed to be extremely difficult numerically and experimentally. The validity of the FE model of T-joint forming and our previously developed virtual THF system is verified by comparing the FE simulation and experimental results.

並列關鍵字

Warm Hydroforming ； Magnesium alloy tube ； T-forming ； Temperature ； Formability