共查询到19条相似文献,搜索用时 100 毫秒
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采用快速超塑成形技术对高铁车辆侧壁外板进行成形试验,结果表明,其生产效率高、成本低,能够成功解决传统冲压工艺无法实现复杂空间曲面铝合金零件以及传统超塑成形工艺成形周期长、效率低的难题。通过系列试验研究,确定了热冲压工艺与超塑成形工艺相结合的快速超塑成形技术,成功使用厚度为4 mm的工业用铝合金薄板制造了圆角极小(R≤4 mm)的高铁边缘蒙皮和直壁拉深成形的大型地铁门框零件(h≈80 mm),该成形件具有尺寸精度高、壁厚分布均匀、形状稳定性高等优点,同时其力学性能满足使用要求。 相似文献
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用超塑性成形工艺对外侧表面带凸耳的空心圆锥体铝合金(7A04)零件进行了成形试验,通过分析和试验确定了合理的超塑成形工艺和模具结构。该零件须分两步进行超塑成形:先成形空心圆锥体,再成形凸耳;超塑性成形工艺制造该零件比原机加工工艺简单,节省材料超过60%。 相似文献
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《中国有色金属学会会刊》2006,16(A03):1411-1414
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Overview of superplastic forming research at ford motor company 总被引:1,自引:0,他引:1
Friedman P. A. Luckey S. G. Copple W. B. Allor R. Miller C. E. Young C. 《Journal of Materials Engineering and Performance》2004,13(6):670-677
In an effort to reduce vehicle weight, the automotive industry has switched to aluminum sheet for many closure panels. Although
the application of aluminum is compatible with existing manufacturing processes and has attractive qualities such as low density,
good mechanical properties, and high corrosion resistance, it has less room-temperature formability than steel. The expanded
forming limits that are possible with superplastic forming can significantly improve the ability to manufacture complex shapes
from materials with limited formability. Aluminum closure panels produced by superplastic forming have been used by Ford Motor
Company for over a decade. However, applications have been limited to low-volume, specialty vehicles due to the relatively
slow cycle time and the cost penalty associated with the specially processed sheet alloys. While there has been substantial
research on the superplastic characteristics of aluminum alloys, the bulk of this work has focused on the development of aerospace
alloys, which are often too costly and perhaps inappropriate for automotive applications. Additionally, there has been a limited
amount of work done to develop the technologies required to support the higher production volumes of the automotive industry.
This work presents an automotive perspective on superplastic forming and an overview of the research being performed at Ford
Motor Company to increase the production volume so superplastic forming can be cost competitive with more traditional forming
technologies.
This paper was presented at the International Symposium on Superplasticity and Superplastic Forming, sponsored by the Manufacturing
Critical Sector at the ASM International AeroMat 2004 Conference and Exposition, June 8–9, 2004, in Seattle, WA. The symposium
was organized by Daniel G. Sanders, The Boeing Company. 相似文献
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在910,930和950℃这3种温度下,针对我国新型TNW700高温钛合金薄板开展了双向超塑性圆锥胀形试验,并对圆锥胀形过程进行了理论分析。结果显示:在稳定加载气压的作用下,随着温度的升高,TNW700高温钛合金板料的超塑性变形能力呈先提升、后下降的趋势,在930℃时获得最佳的成形高度和表面应变,且试件具有最均匀的壁厚分布和最稳定的塑性流变。950℃的试样比930℃的试样的最大表面应变下降了11.8%,但其具有最大的平均应变速率。对试件的微观组织观察可知:随着温度的升高,材料不仅发生了晶粒长大的现象,而且伴随有β相的产生;在同一温度下,随着变形量的增加,一定体积分数的β相增加有利于稳定该材料的塑性流变。 相似文献
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铝合金7075蠕变时效成形回弹规律 总被引:1,自引:1,他引:0
蠕变时效成形技术是利用金属的蠕变特性,将成形与时效热处理同步进行的一种成形方法。文章以可时效强化型铝合金7075为研究对象开展蠕变时效成形试验,考察厚度、弹性预变形量、时效时间和温度的综合效应对成形曲率半径的影响规律,并通过正交多项式回归分析,建立了回弹率与4个试验因素之间的回归方程,进行的工艺试验验证结果表明,运用该回归方程可以对蠕变时效成形后零件的回弹率进行预测。 相似文献
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通过光学显微镜(OM)、扫描电镜(SEM)、室温拉伸试验等研究了成形速度对7050铝合金锻件显微组织、力学性能和断口形貌的影响。结果表明,随成形速度的增加,7050铝合金锻件的晶粒截面形貌逐渐由圆形过渡到细长状,且局部出现粗化。抗拉强度和屈服强度随成形速度增加呈先增加后减小的趋势,伸长率随成形速度的增加逐渐减小;当成形速度为2 mm/s时,抗拉强度、屈服强度分别达到608 MPa和560 MPa,伸长率为12.7%;当成形速度分别为2 mm/s和8 mm/s时,拉伸后试样的断裂形式以穿晶断裂为主,伴随着少量的第二相粗大颗粒和晶间断裂,且随着成形速度的减小,韧窝数量不断增加,韧窝深度也逐渐变深。实际热模锻生产成形速度宜选择2~8 mm/s。 相似文献