共查询到18条相似文献,搜索用时 218 毫秒
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以不同的速度对高纯铝箔进行轧制试验,用非接触式三维表面轮廓仪观测了铝箔表面形貌,并从润滑状态、表面轮廓自协方差函数及功率谱密度等方面研究了轧制速度对铝箔表面形貌的影响。结果表明:在轧制过程中,摩擦主要是由轧辊表面微凸体压入高纯铝表面产生的塑性变形及犁沟作用所致;铝箔的表面粗糙度主要取决于轧辊的表面粗糙度,轧制速度的变化不会影响铝箔表面轮廓的主要特征;轧制速度从5m.s-1提高到7m.s-1后,铝箔横向表面粗糙度无明显变化,而轧向表面粗糙度下降,表面微观形貌得到了改善;轧制速度的变化不影响铝箔表面轮廓的自相关性,铝箔的表面轮廓以空间波长较长的空间随机分量为主。 相似文献
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对90W-7Ni-3Fe硬质合金进行了超声振动激光切削测试,并分析了表面完整性的影响因素,通过实验对工件的显微组织形貌、表面结构、残余应力、粗糙度、表面硬度与晶体位错密度开展了研究。研究结果表明:采用超声振动激光切削方式获得了比常规切削模式更小的粗糙度,对犁沟与鳞刺起到显著抑制作用,获得了更小的工件表面粗糙度,显著改善了加工质量。以相同工件进行切削时得到的钨相与粘结相位于亚表面区域的变质层,钨相变质层达到400 nm的厚度,粘结相变质层达到1μm的厚度。采用超声振动激光切削得到的工件表面位错密度相对常规切削。与基体硬度相比,以UEVC与CC方式切削加工表面硬度显著提高,超声切削试样表面更明显硬化。采用超声振动方式形成了更高残余应力。 相似文献
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利用有限元方法,研究了压下量及前后张力对柔性薄膜太阳能电池用不锈钢基板轧制过程中应力分布的影响.结果显示,适当增加压下量有利于表面应力的均匀分布,且可减少轧制道次,但过大压下量容易导致不均匀塑性变形;采用后张力稍大于前张力的轧制工艺,可使基板应力分布趋向均匀,当前后张力值分别为40 kN和58 kN时,应力分布均匀且板内最大等效应力值最小.研究表明,采用后张力稍大于前张力、压下率控制在30%以内的轧制工艺,可保证薄板应力值较小且分布均匀.最后,在模拟结果的指导下,成功轧制得到厚0.25 mm的不锈钢基板,其厚度分布与模拟结果基本一致,且粗糙度满足基板的使用要求. 相似文献
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针对超音速火焰喷涂WC-17Co高硬涂层的加工难题,对WC-17Co涂层进行了高速/超高速磨削试验。通过考察不同金刚石砂轮和磨削工艺参数对磨削力、磨削温度和表面残余应力、表面/亚表面微观形貌和表面粗糙度的影响,讨论了最大未变形切屑厚度与比磨削能的内在关系,分析了磨削温度对表面残余应力的作用规律,探讨了法向磨削力对涂层亚表面损伤的作用规律。结果表明:WC-17Co涂层磨削去除是脆性和延性去除并存;提高砂轮线速度将使磨削力先快速减小后缓慢增大,磨削温度持续升高,涂层磨削从脆性去除转为延性去除的趋势也逐渐增强,表面残余应力由压应力逐渐转变为拉应力,而磨削高温引起涂层热塑性变形是表面残余应力状态转变的根本原因。涂层亚表面磨削损伤层平均深度随法向磨削力的增大而变大。提高砂轮线速度、降低工作台速度和减小磨削深度均能增大涂层磨削塑性去除的比例。 相似文献
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分析了铝电解电容器阳极氧化膜的形成过程,介绍了衡量氧化膜品质优劣的参数:升压时间tr、漏电流LC、水煮后升压时间Tr60(s)、容量及容量散差、箔片表面氯离子残留量及箔片的耐水合性能。阳极化成箔对电容器的漏电、损耗、寿命等都起着至为关键的作用,正确选择阳极化成箔在生产过程中显得尤为重要。 相似文献
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采用磷酸阳极化工艺对铝箔网进行了表面处理,研究了阳极化工艺参数对其与树脂基复合材料粘接性能的影响,并对优化后工艺处理的铝箔网表面形貌及粘接性能进行了分析。结果表明:最佳工艺参数的去氧化时磷酸体积分数为16%,处理时间为6min,氧化时磷酸体积分数为16%,处理时间为23min;磷酸阳极化后,铝箔网表面生成一层疏松多孔的氧化膜,可以增大铝箔网表面与复合材料的粘接界面面积,并有良好的界面效应,有效地提高了粘接强度,与处理前的抗拉剪强度相比,提高了14.66%;同时铝箔网的耐蚀性也得到了较大提高。 相似文献
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Rolled copper foil is widely used in high frequency and speed transmission of fine line printed circuit board, because of its high strength, good toughness and high density. In this paper, a theoretical model for copper foil rolling in mixed lubrication regime was developed on the basis of the average volume flow model and asperity flattening model. A more accurate relation for the variation of the lubricant viscosity with pressure and temperature was considered. The cold rolled copper foil experiment was carried on with different viscosity of rolling oil and pass reduction. The effects of rolling oil viscosity and pass reduction on lubricant pressure, contact area ratio and film thickness ratio were studied. The calculation results agree well with the measured data from copper foil rolling experiment. For obtaining higher surface quality, the rolling oil viscosity is about 10 mm2/s, and the pass reduction is about 30%. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
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Shu XuedaoDepartment of Mechanical Engineering University of Science andTechnology Beijing Beijing ChinaShen GuangxianDepartment of Mechanical Engineering Yanshan University Qinhuangdao China 《机械工程学报(英文版)》2003,16(2):181-183,189
To improve roll system stability of aluminum foil mills, roll system stability of 2200 highspeed aluminum foil mill is analyzed with energy stable method. Two different restrictive conditions which gaps between chock of work roll and window of stand whether exist or not, are studied respectively. A new concept of roll system with open /closed compound pair conies up with as well for re-newably synthesizing restrictive mechanism of aluminum foil mills' chock. Through these studies, the conflict, whether reserving the gap for the roller replacement or eliminating the gap for roller's normal work, is successfully settled. This concept and analyzed result give the actual mechanism with open/closed compound restriction and the method of realizing high-speed rolling and prolonging longevity of end thrust bearing on work roll. It has important theoretical meaning and engineering value for modern technical reform of aluminum foil mills and plate strip mills. 相似文献
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基于弹性壳体模型的波箔型气体动压径向轴承静特性分析 总被引:1,自引:1,他引:0
采用有限单元法,对波箔型气体动压径向轴承的箔片建立了弹性壳体单元模型。该模型综合考虑了箔片膜效应与弯曲效应之间的耦合,更能真实地反映出波箔和平箔的变形。运用有限差分法及Newton-Raphson迭代法耦合求解Reynolds方程和气膜厚度方程,分析了轴承气膜厚度分布、压力分布、箔片变形量分布以及承载能力,并与实验结果进行了比较,证明了该方法的可行性和精确性。分析了转速、箔片厚度对轴承特性的影响,结果表明:转速上升,承载能力增大;箔片厚度小于0.2mm时,厚度的改变对轴承的影响较大。 相似文献
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In the cold rolling of aluminum foil, coolants made with nonaromatic base oils provide poor lubricity compared with coolants made with conventional base oils. But there is no clear difference in lubricity between nonaromatic and conventional base oils in the case of the rolling of aluminum sheet. In evaluations of the adsorption activity of model base oil components, alkylbenzene with a longer alkyl chain shows the potential to enhance the adsorption activity of alcohol onto the nascent aluminum surface. In experimental rolling, furthermore, the lubrication performance of coolants using nonaromatic base oils can be improved with the addition of dodecylbenzene. The addition of 10 mass% of dodecylbenzene into a nonaromatic coolant is sufficient for practical lubrication performance in the cold rolling of aluminum. 相似文献