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TA18變徑管高壓氣脹成形工藝及壁厚分布
發(fā)布人：上海艾荔艾金屬材料有限公司www.85978597.cn
更新時間：2015-09-12
在一定的溫度范圍，以高壓氣體作為傳力介質(zhì)，通過溫度、內(nèi)壓和補(bǔ)料量匹配加載使管坯貼膜的熱加工技術(shù)，稱為高壓氣脹成形技術(shù)。在800 ℃時，以不同加載路徑和不同補(bǔ)料量對TA18管材進(jìn)行脹形實(shí)驗(yàn)，研究加載路徑和補(bǔ)料量對50%膨脹率TA18鈦合金變徑管的成形過程和壁厚分布的影響。
TA18變徑管高壓氣脹成形工藝及壁厚分布High pressure pneumatic forming process and wall thickness distribution of TA18 titanium alloy large expansion ratio tube
在一定的溫度范圍，以高壓氣體作為傳力介質(zhì)，通過溫度、內(nèi)壓和補(bǔ)料量匹配加載使管坯貼膜的熱加工技術(shù)，稱為高壓氣脹成形技術(shù)。在800 ℃時，以不同加載路徑和不同補(bǔ)料量對TA18管材進(jìn)行脹形實(shí)驗(yàn)，研究加載路徑和補(bǔ)料量對50%膨脹率TA18鈦合金變徑管的成形過程和壁厚分布的影響。結(jié)果表明：在補(bǔ)料階段，內(nèi)壓過小或者過大引起材料在變徑管過渡區(qū)堆積起皺；不同軸向補(bǔ)料量成形的TA18變徑管，壁厚分布規(guī)律不同；在合適的加載路徑下，分別補(bǔ)料20、30、36和40 mm得到的TA18變徑管的最大減薄率分別為29.07%、24.01%、18.15%和13.02%。
At a certain temperature range, the tube blank is bulged out until it attaches to the inside of mould cavity by high pressure gas, matching with axial feeding. This plastic forming processing is called high pressure pneumatic forming (HPPF). At 800 ℃, the 50% expansion ratio tubes of TA18 titanium alloy were formed with different loading paths and different axial feedings. The results show that the wrinkles are formed in the transition zone of tube because the materials are accumulated when the inner pressure is too high or too low. The thickness of adjustable tubes with different axial feedings is changed. At the appropriate loading path, TA18 adjustable tubes without defects are formed with axial feeding of 20, 30, 36 and 40 mm, and their maximum thinning ratio are 29.02%, 18.73%, 13.41% and 10.49%.
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