高速轧辊磨床主轴系统动静压轴承供油液压系统的开发

介绍了普通轧辊磨床主轴系统动静压轴承供油方式的特点,并对常用的普通动静压轴承的恒流量供油系统和恒压供油系统进行了详细的对比分析,在此基础上,设计了高速轧辊磨床主轴系统动静压轴承的供油液压系统,结果表明,相较于常用的普通动静压轴承的恒压供油系统,高速动静压轴承的恒压供油系统的压力稳定性更好,压力调节更方便和可靠.     

层流液体动静压混合轴承设计理论研究

分析并总结了液体动静压混合轴承的静压补偿原理，层流液体动静压混合轴承的设计要求，并建立了求解层流液体动静压混合轴承的基本方程。     

动静压轴承技术 改造与应用

浙江读者吴振平来信询问，该厂计划采用动静压轴承新技术改造日本G830球面滚子磨床主轴轴承，希望请一专业厂家介绍有关技术，特别是实际改造应用效果。众所周知，各类磨床的磨削质量主要取决于砂轮主轴系统的刚性、回转精度和稳定性。此外，磨床主轴系统的寿命也是使用者关注的问题。一、动静压轴承的特点动静压轴承技术是从静压轴承的基础上发展起来的一种新型轴承结构，它保留了静压轴承的一切优点，其与静压轴承的主要不同之点，或者说，其优于静压轴承的主要之点是，其利用了动压轴承的附加动压效应，并采用表面二次节流技术，取消了…     

薄膜节流六腔静压轴承的设计计算

对静压轴承作了一般性介绍,提出了静压轴承的设计准则。通过双薄膜节流六油腔静压轴承的设计实例,演释了静压轴承设计的通用模式;实例的结果验证了设计方法是科学的、有效的、正确的,为磨床砂轮架静压轴承设计打开了一个新的思路。     

M115W外圆磨床磨头液体静压轴承改装设计

不等封油边静压轴承,利用主轴挠度对轴承油膜刚度的影响,变主轴挠度这个不利因素为提高轴承油膜刚度的有利因素.因此,不等封油边静压轴承的设计,是在固定节流静压轴承的基础上,通过改善轴承本身结构提高轴承的承载能力.M115W外圆磨床磨头采用不等封油边液体静压轴承进行改装设计,提高了主轴系统的刚度,改装后的M115W外圆磨床达到了原有的加工精度和使用性能.     

有限元数值模拟在静压轴承设计中的应用

采用有限元法，借助ANSYS软件和自编子程序计算出了一定载荷下静压轴承流场的速度分布、压力分布及油膜的承载能力，得出了该载荷下保持液体摩擦状态所需的油腔供油压力，并根据计算结果设计了静压轴承的供油系统，经实用和跟踪测试证明，该系统工作良好。     

恒流供油扇形静压推力轴承承载力解析计算与实验研究

针对重型液体静压转台的传统设计中,恒流供油扇形静压推力轴承承载力的计算未计入离心力因素,且传统设计使用的简化计算方法缺乏实验验证的问题,推导了计入离心力因素的恒流供油扇形静压推力轴承承载力解析计算公式;设计建立了重型液体静压转台实验系统,并进行了实验研究。实验值与解析计算值的对比分析表明,两者基本吻合,验证了计入离心力因素的恒流供油扇形静压推力轴承承载力解析计算公式有效可行,为恒流供油扇形静压推力轴承的设计计算提供了理论依据。     

静压气体轴承设计支持系统的研究

本文介绍了静压气体轴承设计支持系统的总体方案。在分析了静压气体轴承设计特点的基础上,提出了一种用事件并借鉴面向对象的技术来表达的基于知识推理的方法来实现本系统的设计。     

静压润滑的灵活运用

本文较系统地介绍了内阻尼式静压轴承、静压导轨、静压螺母和静压上推轴承的设计思想与当前国内外在某些设备上的应用，有助于促进更广泛的推广静压润滑技术。     

JDZ系列液静压电主轴的设计

本文以JDZ-2主轴为例,论述JDZ系列液静压电主轴的设计要点,介绍高速径向轴承的技术数据和高速推力轴承的设计方法、克服离心力的技术措施及其计算公式,提出了在静压主轴系统中轴和轴承接近程度的计算公式。     

Experimental analysis of factors influencing the cage slip in cylindrical roller bearing

This paper deals with the effect of operating parameters on cage slip in cylindrical roller bearing. A cylindrical roller bearing test rig is developed to measure the running speed of bearing elements at various operating conditions. The effect of operating parameters namely shaft speed, radial load, viscosity of lubricating oil, number of rollers, and bearing temperature on cage slip are experimentally obtained. The critical load and magnitude of cage slip for various operating conditions are obtained. The non-dimensional number is derived based on the operating parameters. The region where cage slip occurs is developed from the derived non-dimensional number and the experimental data. The temperature raise is experimentally obtained during slip condition and its effect on viscosity is included for calculations. The frictional forces are experimentally obtained and are compared with the theoretical findings. The significant effect of operating parameters on cage slip of cylindrical roller bearing is discussed based on the experimental findings.     

离心压缩机的振动分析及解决措施

针对空分系统使用的离心压缩机振动大的原因进行分析,并提出改进措施,使其运行周期延长,同时降低了能耗.     

回转窑简体轴线测量方法与系统

回转窑轴线的测量对于合理调整工艺操作规程及托轮摆放位置，避免托轮轴瓦发烧，改善筒体的受力状况，保护筒体等，具有重要的实际意义。论述了大型回转窑运行轴线动态测量的原理和方法，包括轮带和托轮直径的在线测量、轮带与筒体间隙的测量、筒体运行轴线水平直线度和垂直直线度的动态测量。设计研制了一种新型大型回转窑运行轴线动态测量系统，该系统具有结构简单、安装使用方便、测量精度高等特点。实际测量应用表明：所述的方法及仪器具有较高的测量精度和可靠性。     

立式水润滑可倾瓦轴承-转子试验台设计*

第三代压水堆核电站中广泛采用的立式水润滑轴承技术是制约我国核电发展的关键点之一,因此建立立式轴承试验台进行相关试验有重要的工程价值。提出一种包含加载激励约束系统、供水密封系统、测量系统的立式水润滑可倾瓦轴承试验台设计方案;通过比较卧式轴承试验台和立式轴承试验台在加载时对于轴承约束的不同,给出适合立式轴承试验台的浮动轴承约束机构方案;按照相似准则对AP1000核主泵立式水润滑可倾瓦轴承进行缩比设计,在满足Summerfeld数、宽径比和间隙比要求的条件下,设计出适合试验研究的轴承试件。试验结果显示：研制的立式四瓦可倾瓦水润滑轴承试验台,能够实现试验轴承在不同转速和加载、激励工况下瓦面温度、供水压力、静载荷、水膜脉动压力、转轴涡动等的测量,运转状态稳定,可以满足立式水润滑可倾瓦轴承动静特性的研究要求。     

无外圈圆柱滚子轴承外径的测量

将普通的外径测量经过简单的改进，增加一个修正值，就可以测量无外圈圆柱滚子轴承外径尺寸。该方法测量直观，精度高，使用方便。     

基于混合编程的风力发电机组轴承故障诊断系统

为了保障风力发电机组的安全可靠运行,结合风力发电机组中轴承故障特性,研发了一套针对风力发电机组轴承的故障诊断软件。该软件利用Visual C++和Matlab混合编程实现,可以对风机轴承进行数据采集和故障诊断。根据诊断结果可以对机组工作状态做出判断,针对异常情况可以帮助工作人员查明故障原因,提前做好预警和维护计划,提高风力发电效益。最后在模拟实验台上采集了故障轴承的振动信号并用该软件进行了时频分析、解调分析和倒谱分析,分析结果与实际故障吻合良好。     

A study of the dynamic characteristics of synchronously controlled hydrodynamic journal bearings

In this paper, synchronous control of bearing is employed through a control algorithm for an actively controlled hydrodynamic journal bearing in order to suppress whirl instability and to reduce the unbalance response of a rotor-bearing system. Furthermore, a cavitation algorithm, implementing the Jakobsson–Floberg–Olsson boundary condition, is adopted to predict cavitation regions in a fluid film more accurately than the conventional analysis, which uses the Reynolds condition. The unbalance responses and stability characteristics of the rotor-bearing system are investigated for various control gains and phase differences between the bearing and journal motion. It is shown that the unbalance responses of the system can be greatly decreased by synchronous control of the bearing. There is an optimum phase difference, which gives the minimum unbalance response of the system at given operating conditions. It is also found that the stability threshold of the system can be greatly increased by synchronous control of the journal bearing.     

Effect of Bearing Surroundings on the High-Speed Spindle-Bearing Compliance

This paper investigates the effect of bearing assembly tolerance on spindle-bearing compliance. In a high-speed spindle system, the bearing characteristics are influenced significantly by the initial assembly tolerances and the thermal deformation of the bearing surroundings. In the very early stage of spindle operation, spindle bearings could be under hazardous conditions owing to the rapid change of the internal pressure resulting from thermal deformation or centrifugal force-oriented deformation. The bearing’s internal clearance also may be changed by the operating conditions such as external load, rotational speed, and operating cycle time. To determine the initial tolerance and the optimal cooling regimen, a comprehensive dynamic modelling and analysis of a high-speed spindle system in terms of bearing pressure, bearing compliance, and heat generation is required with consideration of those effects. Moreover, in order to predict spindle characteristics in operation, all of these parameters should be monitored and recalculated in real-time. For this purpose, very simple and effective equations are suggested, representing the bearing stiffness in accordance with the thermal deformation. Most former bearing analyses were based on the Hertzian contact model, without considering the radial elastic defor-mation of the races. In this paper, analytical and experimental investigations of the bearing compliance are conducted with consideration of both the elastic deformation of the race and the thermal deformation of the housing in terms of the bearing stiffness. The experimental results show the effectiveness of the proposed equations, which are simple and useful for fast calculation of the bearing stiffness by dynamic simulation.     

低噪声深沟球轴承的工艺改进

从提高套圈外径和内外径精度及端面的定位精度，改善沟道超精方法和轴承装配质量等方面对6204E轴承的加工工艺进行改进，从理论分析和实际测试结果验证了新工艺的可行性和有效性。     

木工平刨床振动特征的试验研究

对一台MB503A型木工平刨床进行振动测试和故障诊断工作，采用选点振动量级的动态测量方法对其刀轴部件、滚动轴承和底座系统进行了振动试验，得出相关的幅频、时域值和图谱。结合旋转机械的振动机理、特征和实际经验，判断出平刨床的刀轴部件存在不平衡和不对中故障、滚动轴承的内圈和滚球出现点蚀现象以及底座松动等振动故障。提出了主要的减振整改建议，为采用动态法提高木工机械的状态监测与故障监测水平提供了依据。