现场缠绕大型贮罐罐底的修补

本文介绍了基础砂垫层不实造成现场缠绕大型贮罐变形破坏的原因和处理方法。     

AN ENERGY ANALYSIS OF BELT POLISHING PROCESS AND ITS APPLICATIONS TO TIME CYCLE AND TRACKING EFFECTS

Belt polishing is a fine machining process widely used to improve surface texture and to increase wear resistance and fatigue life. Despite the basics of this manufacturing process are not yet well understood, the cycle-time and the belt oscillations frequency are considered as fundamental process variables. In this article, their effects on the surface characterization and on the form aspects are investigated in connection with the principal physical mechanisms activated during the superfinishing operations (cutting, ploughing and sliding). With this aim, an energy approach of the belt polishing process, coupled with SEM observations of the abrasive belt, is introduced. Two belt polishing energetic regimes are identified and then discussed.     

氟碳铈矿稀土抛光粉与氟碳酸盐稀土抛光粉性能研究

采用差热热重分析、Ｘ射线粉末法、电子显微术、物理及化学分析等手段，对比分析了氟碳铈矿稀土抛光粉和氟碳酸盐稀土抛光粉的外观形貌、晶体结构、化学成份及物理性能，并探讨了两种试制样品性能差异的机理。     

高精度光学表面的OFHC铜反射镜抛光技术

已研制出用于红外波段光辐射的特殊光样品－高精度光学表质量的无氧高导铜平面板射镜。本文描述了此种铜镜基底的抛光技术。讨论了材料的选择，基底成形精度及抛光工艺研究，给出了最终光学表面的测量结果。     

Surface modification on plating-based Cu/Sn/0.7Cu lead-free copper pillars by using polishing

Thus far, no any effective countermeasure against plating-induced poor uniformity exists in the global packaging market. In this paper, we aim to develop an effective polishing process to improve the poor uniformity existing in advanced double-layer copper pillars. After polishing, the wafer and chip uniformities of copper pillars could be reduced from the original values of 6.8-3.5% and 2.9-0.9%; after reflow, the wafer and chip uniformities of copper pillars reached 3.0% and 1.7%. Excellent uniformity in copper pillars ensures accurate joints, good reliability, high yields, and flexible layouts.     

The effects of bath composition on the morphologies of electroless nickel under-bump metallurgy on Al input/output pad

The electroless nickel plating on an aluminum input/output (I/O) pad was investigated. The aluminum pad was pretreated in a zincate solution prior to electroless nickel plating. Zinc particles on the aluminum pad gave a good adherent nickel layer. The adhesion and uniformity of zinc on the aluminum is the key factor in under-bump metallurgy (UBM). The electrode potential changes with and without zinc ions in the bath were measured to analyze the sequence of two competing reactions: zinc deposit and hydrogen evolution. The relationship between aluminum dissolution and the ratio of zinc and NaOH was investigated. The electroless nickel deposition rate was dependent on bath composition. The effects of complexing ligand and additive on the nickel deposit were analyzed. Electrode potential changes were measured with time to confirm nucleation and grain growth. Adhesion of the UBM was related to zinc-particle dissolution and nickel nucleation. The uniform nickel UBM was fabricated on a real Al I/O pad.     

涤棉大提花交织物的染整工艺

根据涤棉大提花交织物的组织规格特点，前处理采用不烧毛、不定形工艺。染色则采用分散／活性连续工艺流程。并就不同染色工艺处方下的染色效果进行讨论，给出了最佳工艺条件。     

AM用盘式刹车片生产线设备配套研究

介绍了AM用盘式刹车片生产线设备配套方案及相应研发检测设备,指出此类生产线已在实践中应用,具有实用性和先进性,可供盘式刹车片生产厂家参考。     

基于TFSI的冲击载荷作用下可倾瓦径向轴承热瞬态性能分析

为了研究可倾瓦径向轴承在载荷扰动下的瞬态行为,对瞬态油膜压力和温度分布采用TFSI(Temperature-Fluid-Structure Iteration)瞬态计算方法,建立三维油膜和轴颈及瓦块三维有限元模型。应用热流固耦合迭代求解方法,模拟汽轮发电机可倾瓦径向轴承在阶跃载荷冲击工况下热瞬态非线性响应过程。给出瞬态过程中油膜温度分布,最高温度、最小膜厚等参数的变化规律。认为瞬态过程中,油膜温度和膜厚变化量较大,油膜温度和膜厚响应有一定的超调量,瞬态过程中有可能因油膜温升过高或膜厚太小而导致失效。     

可倾瓦轴承全尺寸试验及润滑与振动性能研究

针对某在役百万千瓦级核能发电机用可倾瓦轴承瓦温过高的问题,给出了优化的轴承结构参数,并对两个不同参数的全尺寸三瓦可倾瓦轴承在动平衡试验机上同时进行了瓦块温度、油膜厚度、瓦块摆角等润滑性能及轴系振动性能试验,提出了基于瓦块自适应摆动特性的油膜厚度测试方法和瓦块摆角识别方法。结果表明:1号轴承相比2号轴承具有更好的润滑性能;利用瓦块随转子自适应摆动特性识别的油膜厚度相比理论结果具有较高的识别精度,同时依据试验膜厚信息识别的瓦块摆角相比理论结果具有较好的一致性;在振动性能方面,依据转子振动数据识别了转子的一阶临界转速及临界时轴承的综合刚度k_X、k_Y,其与理论综合刚度keq相比平均误差约50%。