轧机辊系弹性变形的有限元计算

建立了分析轧机辊系弹性变形的有限元方程和边界条件，在计算模型中首次考虑了辊间非线性接触摩擦，分析了在接触非线性条件下辊间载荷分布和辊缝形状的变化规律，考题计算与实验结果吻合。这为板带轧机设计、轧制工艺优化、板形控制等提供了一个高精度的分析方法。     

Ultrasonic power features of wire bonding and thermosonic flip chip bonding in microelectronics packaging

The driving voltage and current signals of piezoeeramie transducer (PZT) were measured directly by designing circuits from ultrasonic generator and using a data acquisition software system. The input impedance and power of PZT were investigated by using root mean square (RMS) calculation. The vibration driven by high frequency was tested by laser Doppler vibrometer (PSV-400-M2). And the thermosonic bonding features were observed by scanning electron microscope (JSM-6360LV). The results show that the input power of bonding is lower than that of no load. The input impedance of bonding is greater than that of no load.Nonlinear phase, plastic flow and expansion period, and strengthening bonding process are shown in the impedance and power curves. The ultrasonic power is in direct proportion to the vibration displacement driven by the power, and greater displacements driven by high power (5W) result in welding failure phenomena, such as crack, break, and peeling off in wedge bonding. For thermosonic flip chip bonding, the high power decreases position precision of bonding or results in slippage and rotation phenomena of bumps. To improve reliability and precision of thermosonic bonding, the low ultrasonic power (about 1-5W) should be chosen.     

乳液稳定性与其相关因素的关系

探讨了ＨＬＢ法对乳液配制的指导意义，含阴离子乳化剂液体系获得良好稳定性；助表面活怀剂对普通乳液稳定性的作用，为稳定乳液的研制提供了具体的途径和方法。     

1600高速铝带轧机扭振研究(续完)

四、稳态轧制扭振形态及其振源辨识 4—1:稳态扭转的基本形态——时域曲线功率谱分析 稳态轧制过程的扭振时域曲线是正弦波加宽带随机噪声的平稳随机过程。其统计规律不依赖时域曲线中时间的选取,而具有重复性。对其所做功率谱分析结果(图16)说明     

一种高性能铸轧辊套材料的研制

分析了目前铝常规铸轧与极限铸轧(快速铸轧)工艺要求之间的差距,提出大幅度提高铸轧辊套材料的综合性能是实现极限铸轧的先决条件.通过选择铍铜合金材料为研制对象,优化合金成分设计与精细调控热处理工艺,初步实现了强度、硬度、导热性、热强性和抗疲劳性良好匹配的目的.通过对材料的检测分析与工艺实验,证明研制出来的材料的综合性能优良,为极限铸轧技术的应用提供了有力支持.     

超塑Al-Mg-Li合金的显微组织与织构特性

采用一种新型形变热处理方法制备细晶Al-Mg-Li合金板材,研究静态再结晶退火对合金板材晶粒组织及超塑变形行为的影响。结果表明,晶粒尺寸、形状和织构的分布沿板材法向方向存在明显不同;表面层的晶粒组织细小、等轴,含有旋转cubeND{001}（310）取向;中心层具有粗大、长条状晶粒,含有a取向线的织构组分。随着再结晶温度的升高,整个板材的晶粒尺寸长大,中心层晶粒纵横比减小,表面层织构强化而中心层织构弱化,超塑性伸长率下降。升高再结晶温度导致整个板材内的旋转cubeND{001}（310）织构组分强化而a取向线的织构弱化。分析了不同温度下再结晶织构的形成机制。     

带钢表面振纹的工业试验与发现

对某平整机生产的带钢表面横振纹进行了一系列试验研究 ,发现带钢表面振纹与系统的自激振动强相关 ,此种振动源于部分流体润滑与粘滑兼存的辊缝界面