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2219铝合金热变形行为对精密旋压成形的影响
温涛1, 张绪虎1, 文秀青2, 阴中炜1, 赵磊1
1.航天材料及工艺研究所, 北京 100076;2.长征学院, 北京 100076
摘要:
采用Gleeble-3500热力模拟试验机对2219铝合金进行物理模拟。通过应力-应变曲线和金相组织观察研究了2219铝合金的高温塑性流变行为及其对合金旋压变形的影响。结果显示: 2219铝合金在高温塑性变形过程中的流变应力主要受变形温度和应变速率的影响,变形量对其影响不明显;随着变形温度的提高或应变速率的降低,应力-应变曲线中的峰值应力和稳态流变应力均呈现下降的趋势。另外,采用“Gleeble”物理模拟+工艺试验的研制路线有助于实现2219铝合金大型结构件旋压成形的“控形” ,基于热模拟结果设计特征旋压温度(300~350℃)、进给比(0.6~1.5 mm/r)、变形量(30%)对2219铝板进行旋压变形,可获得内、外表面质量均良好的大型铝合金壳体,其壁厚差<0.2 mm,且壳体内型面与理论型面样板单边间隙<0.1 mm。
关键词:  2219铝合金  塑性流变行为  精密旋压成形
DOI:10.12044/j.issn.1007-2330.2018.06.008
分类号:TG249
基金项目:
Effect of 2219 Al-Alloy's Thermal Deformation Behavior on Netshape Spinning Processing
WEN Tao1, ZHANG Xuhu1, WEN Xiuqing2, YIN Zhongwei1, ZHAO Lei1
1.Aerospace Research Institute of Materials & Processing Technology, Beijing 100076;2.College of Changzheng, Beijing 100076
Abstract:
The physical simulation of 2219 Al-alloy was carried out by the Gleeble-3500 thermal simulation tester.Through stress-strain curves and microstructure observement,the heat plastic rheological behavior of 2219 Alalloy and its effect on spinning forming was studied. The results show that the rheological stress of 2219 Al-alloy during heat plastic deforming is mainly influenced by deforming temperature and strain rate,the effect of deformation rate is not obvious.The peak stress and steady state flow stress both reduces with improving temperature and dropping strain rate. It helps to achieve controlling shape during large scale 2219 Al-alloy component spinning forming by combining Gleeble physical simulation and process test. According to thermal simulation test result,spinning deformation is carried on 2219 Al alloy shell with spinning temperature from 300 to 350℃,feed rate from 0.6 to 1.5 mm/r and 30% deformation rate. Al alloy shell with good surface quality can be obtained with wall thickness under 0.2 mm and the unlaterial gap between inner profile and theoretical model under 0.1 mm.
Key words:  2219 Al-alloy  Plastic rheological behavior  Netshape spin forming