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通过试验确定了3A365/155高压腔活塞的加工工艺,反复初中摸索到了活塞起薄壁切削加工的解决方法。 相似文献
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阐述了液相法中制备超薄功能膜的新方法——连续离子层吸附反应法(Successive Ionic Layer Adsorption and Reaction,SILAR)。探究了它的薄膜生长机理、工艺参数影响以及应用现状,指出了尚需深入研究的问题。 相似文献
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超薄碳纤维预浸料复合材料是近年来复合材料研究的新趋势,国内超薄碳纤维预浸料复合材料的相关研究起步较晚,研究方向单一,系统地总结归纳有助于未来研究方向的调整与研究目的的明确.本文综述了2000年至今国内外大部分超薄碳纤维预浸料与常规碳纤维预浸料复合材料的对比试验,包括无损拉伸试验、开孔拉伸试验、无损压缩试验、机械连接试验、冲击试验、疲劳试验以及环境影响等,通过对比分析认为:薄层化后的预浸料复合材料在抗裂纹萌发和裂纹扩展方面具有显著的性能优势,从而影响了碳纤维预浸料复合材料成品的各项性能参数,表明超薄碳纤维预浸料复合材料优异的应用前景. 相似文献
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This paper seeks to outline the temperature effect on the buckling properties of ultra-thin-walled lenticular collapsible composite tube(LCCT) subjected to axial compression.The buckling tests of the LCCT specimens subjected to axial compression were carried out on INSTRON-500 N servo-hydraulic machine in dry state and at the temperatures of 25 C, 100 C and 80 C. The load–displacement curves and buckling initiation loads were measured and the buckling initiation mechanism was discussed from experimental observations. Experiments show that the buckling initiation load, on average, is only about 2.2% greater at the low temperature of 80 C than at the room temperature of 25 C due to the material hardening, demonstrating an insignificant increase in the buckling initiation load, whereas it is about 19.5% lower at the high temperature of 100 C than at the room temperature owing to the material softening, implying a significant decrease in the buckling initiation load. The failure mode of the LCCT in axial compression tests at three different temperatures can be reckoned to be characteristic of the buckling initiation and propagation around the central region until rupture. The finite element(FE) model is presented to simulate the buckling initiation mechanism based on the eigenvalue-based methodology. Good correlation between experimental and numerical results is achieved. 相似文献
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本文对要求精度高的大直径、超薄型零件的加工工艺进行了探讨。实践表明,采用常规的加工工艺,易使零件产生严重变形,且变形量极不规则:而采用新的加工工艺后、基本消除了零件变形,产品合格率大为提高。 相似文献
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不锈钢薄板焊接工艺研究已向超薄、特硬的方向发展。1990年,承接了制造精密薄板焊接设备及研究超薄特硬材料焊接工艺的任务。选用了经特殊冷作硬化处理的1Cr18Ni9薄带材。通过操作方法与接头结构,解决了超薄特硬材料的焊接坡口失稳;采用下料时切口留一定的毛刺,使焊缝饱满;选用45°对接接头,提高焊缝的承载能力;在操作上使用等能量输入法,消除了热裂纹等缺陷;通过对焊缝冷作硬化处理,提高了焊缝的机械强度。 相似文献
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