环氧涂层处理的Mg-3Al-1Zn镁合金在齿轮油中的腐蚀疲劳性能(英文)

研究环氧涂层处理后的Mg-3Al-1Zn合金在齿轮油环境下的腐蚀疲劳行为。采用扫描电子显微镜(SEM)观察疲劳试验后试样的腐蚀形貌及疲劳断口特征,并通过能谱仪(EDS)分析试样在齿轮油中的腐蚀产物成分。分析环氧涂层处理前、后2种试样的腐蚀疲劳性能和疲劳裂纹萌生机制。结果表明:经环氧涂层处理后,试样在齿轮油中的腐蚀疲劳极限高于未处理试样的。这是由于环氧涂层可以将镁合金与周围腐蚀环境良好地隔离。环氧涂层的力学性能比镁合金的差,这是疲劳裂纹优先从环氧涂层萌生的重要原因。另外,齿轮油的润滑作用可以使环氧涂层产生剥落现象。     

两端面具有凸块的齿轮锻件温挤成形工艺设计

以某90型摩托车变速箱中的花键主动齿轮锻件为例,依据温挤成形技术原理,对复杂形状齿轮锻件进行了锻件分析和温挤成形工艺分析,阐述了复杂形状齿轮锻件温挤成形工艺设计中的难点与关键点,并结合生产实际,制定了适合生产实际的温挤成形工艺。设计了一套经济实用的温挤成形模具,同时介绍了模具结构和工件原理。经批量生产试制证明,该温挤成形工艺生产的齿轮锻件质量稳定、凸块饱满,且模具结构合理、通用性强、生产效率高。     

新型轿车电动玻璃升降器箱与盖注塑模设计

新型轿车电动玻璃升降器的塑料箱与盖,是升降器传动机构的组装与支撑件。箱与盖的孔与孔位精度,决定着传动机构的性能和精度。在提供了样品的情况下,接收方提出供给方所生产的升降器要与进口产品能通用的要求。箱与盖注塑模设计的过程中,根据样品上模具结构成型痕迹和注塑件的形体分析,确定了注塑模的结构。实践证明,所加工的箱和盖与样品达到了一致,实现了与进口件混装的要求。     

7420重负荷开式齿轮润滑脂在圆筒式混料机上的应用

7420重负荷开式齿轮润滑脂解决了圆筒式混料机的齿轮磨损、喷嘴堵塞和环境污染问题，同时可节约50％的润滑费用。2006年4月，天津钢铁集团有限公司炼铁厂360m。烧结机第二烧结作业区投产，其中沈阳冶金设。     

湖南省四地区室内氡调查

采用ＣＲ－３９固体径迹探测器，在湖南省４地区进行了居室内氡浓度调查，统计学分析表明，４地区室内氡浓度呈对数正态分布。在地形分布上，有西北高、东南低的特点，反映了地质构造和建筑材料等对室内氡浓度的影响。     

Isomorphic Representations and Well-Formedness of Engineering Systems

When representing the elements of different engineering systems as vertices and edges of a mathematical graph, the well-formedness of the topology of the graph, and hence the topology of the engineering system, can be explicitly computed. This enables checking the well-formedness of the engineering system before investing the effort needed for a complete analysis. This method is demonstrated in the paper for the following fields: trusses, dynamic mass-spring-damper oscillator systems and planetary gear systems. The approach facilitates achieving rapid design, correct first time, which is an important aim of modern design computation.     

12CM15型连续采煤机截割齿轮箱内部结构缺陷及改造

在连续采煤机大修过程中,发现截割齿轮箱内部齿轮磨损严重,不能重复使用,经过分析发现,截割齿轮箱内部的齿轮轴及固定部分存在设计缺陷,使内部齿轮磨损严重,故对12CM15型连采机截割齿轮箱内部结构缺陷进行分析并提出改造方案。     

Dynamic Forging of Splines and Spur Gear Forms: A Modified Upper Bound Analysis that Includes the Effects of Inertia and Some Experiments

To analyse dynamic forging of splines and spur gear forms, the upper bound solutions developed earlier for similar quasistatic cases for spline and spur gear form forging were modified suitably to take account of the inertia forces. In the experimental investigation, initially solid cylindrical billets made of tellurium lead were deformed into these shapes, i.e. splines and spur gear forms, using low velocity dropweight impact conditions and the characteristic die load–time and die movement–time results observed. From these results, the typical die load–die movement curves were evaluated in each of these cases, and compared with the estimates based on the modified analysis. Though the dynamic forging loads in each of these cases were, in general, 20%–40% higher than those observed when tested under similar quasistatic conditions, the estimated dynamic forging loads employing the modified upper bound analysis, taking account of the inertia, as given here, showed good correlations with the experiments. These and other results observed on the progressive changes in shapes of the specimens under dynamic loading conditions are given and the results commented upon.     

无缝线路局部快速降温分析研究

基于热力学原理和材料力学知识,以大型有限元软件ANSYS为平台进行温度场的分布,对比了在对相对初始弯曲矢度的不同位置进行局部降温,得出不同位置处温度力的重分布,纵横向位移的前后变化,提出了实施降温的合理位置。     

蝶阀双位显示传动装置

介绍了蝶阀双位显示传动装置的结构和工作原理，分析了其特点和优越性。