共查询到16条相似文献,搜索用时 46 毫秒
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介绍了摆动辗压成形技术在美国、英国、波兰、前苏联、瑞士、日本和德国等工业发达国家的研制和生产概况.综述了我国科技工作者在摆动辗压机的机身设计计算与制造、摆头的设计计算、摆动辗压的运动轨迹以及摆动辗压成形过程中坯料与摆头之间的接触情况等;在摆动辗压成形过程中的应力、应变分布的实验研究与数值模拟分析,缺陷形成机理分析,以及摆辗变形力的工程计算等;热摆动辗压成形工艺、温摆辗成形工艺和冷摆辗成形工艺在汽车、摩托车、五金工具和兵器工业等加工制造业的工程应用等方面所作的成形机理、数值模拟、设备和工艺研究情况. 相似文献
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采用化学成分分析、硬度测试和断口分析等方法分析了某载重车辆钢摆动凸轮断裂的原因。结果表明:摆动凸轮断裂是由于回火脆而导致的脆性断裂。 相似文献
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A numerical simulation on the rotary forging process of a flange is conducted by three-dimensional rigid-plastic finite element method. The states of stress and strain rate in the workpiece are analyzed and the forging mechanism of the flange is reveal6d. Moreover, the influence of the die configuration on the material flow is also analyzed. 相似文献
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针对具有双螺旋齿面差速轮的形状特点,并结合冷摆辗成形工艺的特点,对冷摆辗成形工艺方案、预制坯的形状和尺寸、预制坯的成形工艺以及冷摆辗件的冷摆辗成形工艺等关键技术问题进行了研究;并对冷摆辗凹模芯的加工工艺作了介绍。试验结果表明,采用冷摆辗成形加工方法对差速轮的双螺旋齿形部分进行近净成形加工是高效而经济的。 相似文献
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Erik Kramer Nicholas Kellaris Miguel Daal Bernard Sadoulet Sunil Golwala Matthew Hollister 《Journal of Low Temperature Physics》2014,176(5-6):1103-1108
Design specifications for the support structures of low temperature instrumentation often call for low thermal conductivity between temperature stages, high stiffness, and specific load bearing capabilities. While overall geometric design plays an important role in both overall stiffness and heat conduction between stages, material selection can affect a structure’s properties significantly. In this contribution, we suggest and compare several alternative materials to the current standard materials for building cryogenic support structures. 相似文献
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Finding an application for a given (not necessarily new) material is an elusive problem. Methods for material selection to fill a given application are now well developed. But the inverse problem – that of finding applications for a new material – has no such established methodology. The article discusses some general approaches to the problem and demonstrates recent progress in implementing them. 相似文献