FC系列圆柱滚子轴承实体保持架兜孔中心径测量方法改进

对于FC系列圆柱滚子轴承实体保持架兜孔中心径尺寸,原来的测量方法是将滚子放入保持架兜孔中,用卡尺测量位于保持架直径方向的两个滚子的外侧尺寸,然后通过计算得到保持架兜孔中心径尺寸。由于滚子与兜孔尺寸往往不一致,滚子与兜孔存在间隙,使得兜孔中心径尺寸难以测量和计算准确。针对上述问题,设计和制造了具有弹性的测量样柱,消除了间隙,使得兜孔中心径尺寸测量准确、快速、简便,保证了产品质量。     

大型调心滚子轴承实体保持架兜孔的测量

用标准术柱配合卡尺来检测大型调心滚子轴承的兜孔最大中心距、兜孔倾角和相邻两兜孔中心距，并通过计算将理论测量值标注于标准术柱上，可直观地与实际测量值进行比较，以确定所加工的保持架是否满足产品要求同时给出了实际操作中消除测量误差的方法，从而保证了所加工的保持架满足产品要求，提高了轴承的旋转灵活性，降低了旋转噪声和装配难度。     

推力向心球面滚子轴承实体保持架中心径的测量方法

对于推力向心球面滚子轴承实体保持架中心径的测量,目前常用的方法如图一所示:做两个双锥体的塞子(对圆锥形兜孔而言),分别插到保持架的两个相距最远的兜孔中,使其上部锥体的一根母线AB(及A′B′)正好处于铅直位置,然后用卡尺测量AB和A′B′间的距离,通过换算,求出保持架的中心径 Pc。但仔细分析,会发现这种测量方法尚存在如下一些问题: 1.对于圆锥形兜孔保持架(图一a),由于兜孔直径存在着制造公差(一般又较大),使塞子沿兜孔轴线向下位移,从而造成较大     

专用深度游标卡尺

在铁路客车轴承整体钢保持架的兜孔中有两对突台,其作用是将滚子固定在兜孔中某一适当位置,以保证轴承的顺利组装。由于兜孔的端面不是平面,因此锁点的位置不宜用普通深度尺测量。我们自制了一种深度游标卡尺,专门用来测量锁点的位置尺寸。深度游标卡尺的结构如图1所示。 测量时(图1、2),将标准钢球置于兜孔中,将基尺A面和B面分别靠紧保持架的一端面和外径表面,然后沿保持架外径表面的     

保持架兜孔中心径的测量

原有测量方法无法准确测量出保持架奇数孔兜孔中心径的尺寸,根据保持架兜孔中心径是圆形,三点确定-个圆的原理,改进了测量方法,可以测量保持架兜孔中心径的尺寸,尤其是可以准确测出保持架奇数孔兜孔中心径的真实尺寸.     

提高实体车制保持架方兜孔加工精度的研究

保持架的制造精度,特别是兜孔的制造精度直接影响轴承的性能。针对兜孔制造精度相对较低及精度不稳定的现状,采用先进设备和合理的刀具,保证保持架兜孔的制造精度,不仅保证了轴承的性能,而且提高了保持架的加工合格率和轴承的使用寿命。     

调心滚子轴承实体保持架兜孔倾角测量的改进

调心滚子轴承实体保持架兜孔中心径的测量,必须高度重视兜孔倾角测量的准确性[1].可利用标准滚子及卡规对调心滚子轴承实体保持架倾角进行测量,但在实际生产过程中,同一型号保持架不同批次生产时,其兜孔直径是在一定范围内变化的(同一批次也存在兜孔直径偏差问题),这就使标准滚子外径与兜孔实际直径相配合时存在间隙(或过盈)现象.另外,利用卡规测量时也存在误差,这些误差也将直接影响兜孔倾角测量的准确性.     

调心滚子轴承保持架兜孔中心径的定量测量

调心滚子轴承保持架兜孔中心径Dcp的质量直接影响产品的工作性能。本文介绍了调心滚子轴承保持架兜孔中心径Dcp定量测量的测量原理，并提出一套辅助测量装置。     

调心滚子实体保持架兜孔中心径测量的改进

长期以来对调心滚子实体保持架兜孔中心径没有很好的测量方法。由于产品加工后形成的兜孔底尖中心位置受到兜孔的直径、兜孔的深度以及兜孔的倾角等因素的影响，测量误差较大，因此难以确定兜孔中心径的实际尺寸。所以通常对提交装配的保持架都是以标准轴承套圈试套来确定中心径是否合格。对于大批量装配时出现的中心径影响轴承精度的问题只能全部进行返修。     

360111轴承保持架测量方法的改进

360111轴承保持架在制造过程中极易变形,装配后的成品轴承的旋转灵活性差。采用测量保持架兜孔外复圆直径的方法,代替原来测量兜孔深度的方法,以便控制兜孔与钢球间的径向间隙,提高成品轴承的旋转精度。附图2幅。     

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.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.