圆锥滚子轴承保持架优化设计

通过对圆锥滚子轴承保持架外径与外滚道表面之间的间隙△s分析,利用Mathematica软件对圆锥滚子轴承保持架进行优化设计,改进轴承旋转质量。     

高承载圆锥滚子轴承保持架设计

针对圆锥滚子轴承保持架与载荷之间的矛盾关系,提供了一种新型实心滚子支柱焊接保持架,其有效解决了小尺寸圆锥滚子轴承无法采用支柱焊接保持架的难题。     

四列圆柱滚子轴承梳状保持架的改进

针对四列圆柱滚子轴承在装填滚子时存在的问题,分析了轴承的结构,对梳状保持架进行了改进,从而减小了保持架外径对滚子的包容量,使问题得以解决。     

实体保持架调心滚子轴承优化设计

调心滚子轴承优化设计已于 1 993年完成 ,同时推出三种结构型式 8个直径系列 2 79个型号轴承的优化设计方法及统一表格图册 ,对行业产品结构的更新换代奠定了基础。现对实体保持架调心滚子轴承优化设计中的有关问题加以说明。轴承结构见图 1。图 1　调心滚子轴承1　中挡圈由于实体保持架结构的主参数与冲压保持架结构的主参数通用 ,使得实体保持架结构的中挡圈尺寸受到限制 ,例如 2 2 2 0 5( 5350 5)、 2 30 2 4( 30 531 2 4 )调心滚子轴承中挡圈尺寸如下 :2 2 2 0 5( 5350 5) :内径 d F=33.99mm,外径 DF= 36.76mm;宽度 BF=1 .39mm2 30 2 …     

国内最大的CC型调心滚子轴承研制成功

近日，中机洛阳轴承科技有限公司为国外某知名公司成功研制了国内最大的CC型；中压保持架调心滚子轴承。该轴承内径尺寸630mm，外径尺寸920mm。在此之前，国内生产的最大的冲压保持架调心滚子轴承内径尺寸仅为360mm。CC型冲压保持架调心滚子轴承与MB、CA型实体保持架调心滚子轴承相比，具有承载能力高，应力分布均匀，耐冲击，较高的极限转速和较低的摩擦损耗，     

轧机用双(四)列圆锥滚子轴承冲压保持架的设计改进

针对轧机用双(四)列圆锥滚子轴承使用一段时间后保持架与隔圈发生干涉,造成轴承提前失效的现象,从理论上分析了产生的原因,对保持架进行了改进,在保证滚子组内、外接圆直径不变的前提下,对保持架内、外径及其他外形尺寸在现有设计方法的基础上整体沿滚子径向进行了缩减。     

实体保持架锁量加工设备的设计改进

通过对现行成品轴承装配过程中保持架外径、内径方向锁球和滚子方法的分析,提出设计改进一种新型设备,采用精准定位的方式方法,实现钢球和滚动体的锁紧.该过程操作简单,对于不同外径或内径尺寸的轴承只需调节工装定位装置,旋转轴承即可完成在保持架外径或内径上进行锁紧.杜绝了因人工凿印及老式加工设备进行锁紧导致锁量不一致,而产生掉球...     

铁路货车轴承保持架的材质选择

一、保持架结构 我们分析了由联邦德国FAG公司和日本NSK公司引进的197726轴承,其保持架过梁均比国产保持架过梁宽,其刚度显然要比国产的好,因FAG轴承采用17个滚子,NSK轴承采用20个滚子,而我国则是21个滚子。从轴承内圈、滚子和保持架“负载平衡”方面考虑,减少滚子数量而加大滚子直径,则可增加保持架过梁宽度,从而有助于提高保持架的刚度,增强运行可靠性。     

加强型筐形保持架质量问题的讨论

采用加强型筐形保持架的圆锥滚子轴承有一系列优点。由于普遍增加了滚子的数量和长度,显著提高了轴承的计算寿命;同时在设计中考虑了轴承零件的通用性,为降低成本、缩短生产周期创造了有利条件。 加强型筐形保持架的特点是:重量轻、工作性能和润滑性能都较好,如增加了保持架窗孔的数量和长度,窗孔过梁采用角度压坡,保持架选用外径和外侧角作基准,减小钢板的厚度以及要求表面进行磷化处理等。同时,对保持架的技术条件、检查项目比过去的标准有所提高;有些项目是新增加的,如径向游动量等。     

调心滚子轴承装配方法的改进

传统的特轻特宽系列的调心滚子轴承的装配方法,保持架设计时必须在180°的对称位置上部分削减,才能保证轴承可以合套,但保持架消减后又造成在该位置经常发生掉滚子的问题无法解决。介绍了一种新的调心滚子轴承装配方法,解决了在设计中特轻特宽系列的调心滚子轴承保持架由于兜孔对滚子的包容量过小而掉滚子的问题。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.