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摘要：
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粉末锻造是一种新型高性能的精密塑性成形技术,但其成形时的特殊性导致目前缺乏完善的、普遍适应的粉末锻造成形理论。通过对还原铁粉烧结多孔体预成形坯锻造镦粗成形致密实验,研究了不同初始相对密度、不同高径比、不同摩擦条件对预成形坯锻造镦粗成形、致密的影响规律。得到了粉末锻造镦粗的断裂极限准则,绘制出了断裂极限应变迹线,并着重分析了初始相对密度、高径比和摩擦因子对镦粗断裂极限的影响,确定了镦粗成形极限工艺参数曲线。实验研究结果为粉末锻造预成形坯与模具的设计、工艺参数的优化奠定了理论基础,并提供了有价值的实验数据。
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Powder forging is a new-type and high-performance plastic forming technology.But,there is still no a perfect universal theory of powder forging because of its deforming particularity at present.The deformation and densification laws of upsetting are researched based on experimental results of powder forging of deoxidize Fe porous material at the different initial conditions which include friction factor,relative height and relative density.The local strain limit criterion for the cracking on surface and the correlative curve have been achieved followed by the specialized analysis for the effect of friction factor,relative height and relative density on cracking strain limitation.The limit process parameters are confirmed for the cracking limitation based on experimental results of powder forging.With experimental results,the design of mould and powder forging preformed blank can be optimized and the valuable data from experiment establishes the foundation for the optimization of technological parameters,too.
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基金项目：
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国家自然科学基金研究项目(50175086)
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作者简介：
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参考文献：
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[1]张兴全,李淼泉,吴诗?,等.用有限元法预测粉末体镦粗过程中的裂纹缺陷[J].航空学报,1997,18(4):509512.
[2]张兴全,彭颖红,阮雪榆,等.多孔体材料在镦粗变形过程中表面裂纹的有限元预测[J].上海交通大学学报,1998,32(5):14 17.
[3](美)库恩,(美)劳利编著,任崇信译.粉末冶金工艺:新技术及其分析[M].北京:冶金工业出版社,1982.
[4]华林,赵仲治.粉末烧结材料闭式模锻充满过程实验研究[J].模具技术1999,(1):22 24
[5]Huang C C,Cheng J H.Forging simulation of sintered pow-der compacts under various frictional conditions[J].Interna-tional Journal of Mechanical Sciences,2002,44(3):489507.
[6]Rahman M A,El-Sheikh M N.Workability in forging of pow-der metallurgy compatacts[J].Journal of Materials Process-ing Technology,1995,54(1 4):97 102.
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