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附加前盖对汽车桥壳胀-压成形性的影响 被引量:4
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作者 崔亚平 王连东 +1 位作者 杨立云 刘超 《中国机械工程》 EI CAS CSCD 北大核心 2013年第13期1831-1835,共5页
根据胀-压成形汽车桥壳新工艺,初始无缝钢管经缩径、液压胀形及压制成形后得到带有后油盖及附加前盖的桥壳样件,切除前盖后获得桥壳产品,附加前盖的大小不仅影响材料的利用率,对管坯的压制成形性也有重要影响。针对某小型汽车桥壳,设计... 根据胀-压成形汽车桥壳新工艺,初始无缝钢管经缩径、液压胀形及压制成形后得到带有后油盖及附加前盖的桥壳样件,切除前盖后获得桥壳产品,附加前盖的大小不仅影响材料的利用率,对管坯的压制成形性也有重要影响。针对某小型汽车桥壳,设计了三种不同尺寸、形状的附加前盖,利用有限元分析软件ANSYS模拟了不同附加前盖时桥壳样件的缩径、胀形及压制成形全过程,对比分析了桥包部分的成形性及端部翘曲量,确定了附加前盖的合理尺寸范围。在普通液压机上成功试制出桥壳样件,实际测量了其外形参数,并与模拟值进行了比较,证明了设计方法的可行性。 展开更多
关键词 汽车桥壳 胀-压成形 附加前盖 成形
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胀-压复合成形汽车桥壳预成形管坯的设计及成形试验 被引量:13
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作者 崔亚平 王连东 +1 位作者 杨立云 杨东峰 《中国机械工程》 EI CAS CSCD 北大核心 2012年第21期2577-2580,共4页
根据胀-压复合成形汽车桥壳新工艺,提出了预成形管坯的设计方法,将其桥包部分截面周长与制件对应部位截面周长的比值定义为截面系数;针对某小型汽车桥壳样件,使用分析软件ANSYS对不同截面系数下的预成形管坯进行了成形的有限元模拟,并... 根据胀-压复合成形汽车桥壳新工艺,提出了预成形管坯的设计方法,将其桥包部分截面周长与制件对应部位截面周长的比值定义为截面系数;针对某小型汽车桥壳样件,使用分析软件ANSYS对不同截面系数下的预成形管坯进行了成形的有限元模拟,并根据测定样件的桥包部分过渡圆角的大小,确定了截面系数的取值范围。基于提出的设计方法制定的胀-压复合成形工艺,在普通液压机上成功试制出桥壳样件,实际测量了其外形尺寸,证实了提出的预成形管坯设计方法可行。 展开更多
关键词 -复合成形 汽车桥壳 成形管坯 设计方法 数值模拟
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矩形截面小圆角管件胀-压复合成形工艺 被引量:2
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作者 刘志强 金守一 +1 位作者 祝世强 刘钢 《锻压技术》 CAS CSCD 北大核心 2021年第4期44-49,共6页
对于精度要求高、圆角半径小、厚度分布均匀的矩形截面管件,传统的成形工艺难以成形出合格零件。采用有限元模拟和实验研究的方法,研究了矩形截面小圆角管件胀-压复合成形工艺,分析了内压、上模压下量等关键参数对零件圆角半径和壁厚分... 对于精度要求高、圆角半径小、厚度分布均匀的矩形截面管件,传统的成形工艺难以成形出合格零件。采用有限元模拟和实验研究的方法,研究了矩形截面小圆角管件胀-压复合成形工艺,分析了内压、上模压下量等关键参数对零件圆角半径和壁厚分布的影响。结果表明,增大内压和上模压下量有利于圆角的填充,采用适当的内压和上模压下量,矩形试件的相对圆角半径可以达到0.86。与常规的内高压成形中圆角及附近减薄严重不同,胀-压复合成形工艺的圆角及附近区域具有增厚的现象,有利于获得壁厚更加均匀的小圆角零件。在对成形规律进行研究的基础上,建立了矩形截面小圆角管件的成形工艺窗口,成形出了满足形状与尺寸要求的管件。 展开更多
关键词 -复合成形 小圆角成形 矩形截面管件 壁厚分布 工艺窗口
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Formability determination of AZ31B tube for IHPF process at elevated temperature 被引量:2
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作者 林艳丽 何祝斌 +1 位作者 苑世剑 吴佳 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第4期851-856,共6页
Ring hoop tension test and tube bulging test were carried out at elevated temperatures up to 480 ℃to evaluate the formability of AZ31B extruded tube for internal high pressure forming (IHPF) process. The total elon... Ring hoop tension test and tube bulging test were carried out at elevated temperatures up to 480 ℃to evaluate the formability of AZ31B extruded tube for internal high pressure forming (IHPF) process. The total elongation along hoop direction and the maximum expansion ratio (MER) of the tube were obtained. The fracture surface after bursting was also analyzed. The results show that the total elongation along hoop direction and the MER value have a similar changing tendency as the testing temperature increases, which is quite different from the total elongation along axial direction. Both the total elongation along hoop direction and the MER value increase to a peak value at about 160 ℃. After that, they begin to decrease quickly until a certain rebounding temperature is reached. From the rebounding temperature, they begin to increase rapidly again. Burnt structure appears on the fracture surface when tested at temperatures higher than 420 ℃. Therefore, the forming temperature of the tested tube should be lower than 420 ℃, even though bigger formability can be achieved at higher temperature. 展开更多
关键词 AZ31B tube FORMABILITY HYDROFORMING tube bulging test maximum expansion ratio
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Warm hydroforming of magnesium alloy tube with large expansion ratio 被引量:1
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作者 刘钢 汤泽军 +1 位作者 何祝斌 苑世剑 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第11期2071-2075,共5页
Process of warm tube hydroforming was experimentally investigated for forming an AZ31B magnesium alloy tubular part with a large expansion ratio. Effects of temperature on the mechanical properties and formability wer... Process of warm tube hydroforming was experimentally investigated for forming an AZ31B magnesium alloy tubular part with a large expansion ratio. Effects of temperature on the mechanical properties and formability were studied by uniaxial tensile test and hydraulic bulge test. Total elongation increases with temperature up to 250℃, but uniform elongation and maximum expansion ratio get the highest value at 175℃. Different axial feeding amounts were applied in experiments to determine the reasonable loading path. A preform with useful wrinkles was then realized and the tubular part with an expansion ratio of 50% was formed. Finally, mechanical condition to produce useful wrinkles is deduced and the result illustrates that useful wrinkles are easier to be obtained for tube with higher strain hardening coefficient value and tubular part with smaller expansion ratio. 展开更多
关键词 warm hydroforming magnesium alloy TUBE expansion ratio hydraulic bulge test WRINKLE
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