轧机减速机齿轮时变啮合刚度对动力学特性影响

近年来随着轧机装备水平的不断提高,轧机振动问题显得更加突出和多样化。本文对某热连轧机扭振进行测试,并根据实际参数建立考虑减速机齿轮啮合刚度和时变性的主传动系统动力学模型,利用MATLAB/simulink分析模块进行了仿真研究,得出时变齿轮啮合刚度对轧机主传动系统扭振特性有一定的影响与实测接近。为研究轧机振动提供理论基础。     

球磨机开式齿轮润滑探讨

通过对各种油品性能及球磨机齿轮负载情况的分析,探讨了润滑油品质对齿轮磨损的影响,并提出改进措施.     

A Study of Tricresyl Phosphate as an Additive for Boundary Lubrication

A method of combining thin-layer chromatography with activation analysis to measure quantitatively the individual impurities in tricresyl phosphate (TCP) is described. The relative amounts and types of impurities found in commercial grades of TCP are discussed. Preparative thin-layer chromatography and iron powder chromatography are applied to produce TCP samples with known concentrations of several impurities. The use of the four-ball wear tester as a method of determining trends in wear values as a function of base stock and additive quality is demonstrated. The relationship of acid phosphate rather than TCP concentration to antiwear properties of compounded lubricants is suggested by transition load studies.     

Recent progress on decoupling diagnosis of hybrid failures in gear transmission systems using vibration sensor signal: A review

Reliable recognition of fault type and assessment of fault severity is essential for decision making in condition-based maintenance of gear transmission systems. In engineering practice, the gear systems are often subject to hybrid faults on the same component or different components. The concurrence of multiple faults makes the fault detection, in particular, the examination of both the fault types and severities, more challenging. Recently, this research area has been recognized as an important direction. A logic solution is to decouple the hybrid faults. This paper reviews various aspects of recent research in decoupling diagnosis of hybrid faults in gear transmission systems, and discusses the techniques used for gearbox hybrid faults decoupling. The general fault detection technologies for gearboxes are also briefly summarized. A potential methodology based on the bounded component analysis (BCA) for hybrid faults decoupling is discussed. Possible future research trends of gearbox hybrid faults decoupling diagnosis are suggested.     

压力机大型焊接齿轮结构设计与制造

为推广焊接大齿轮设计与制造技术,以我公司6300kN压力机采用的大齿轮为例,详细阐述了焊接大齿轮从设计、校核到焊接、机加工的关键技术与方法.对于焊接大齿轮的有限元校核计算法、焊缝结构、材料焊接性能、焊接工艺、施焊要领作了详细讲解,为此类焊接大齿轮的设计与制造提供了可靠的设计依据和参考模板.     

齿轮范成加工的计算机模拟

本文根据渐开线齿轮的范成加工原理,提出了一种采用位移矩阵递推在IBM计算机上进行齿轮范成演示的方法。     

N型渐开线少齿差行星传动啮合效率的精确计算法

本文全面考虑了齿轮传动的实际啮合情况,推导出计算N型渐开线少齿差行星传动啮合效率的新公式.公式精确、简便、避免了传统的潜在功率法误差放大的缺点.     

整体式转向梯形机构的优化设计

引入影响汽车行驶转向性能的轮胎侧偏、悬架侧倾和,前轮定位等主要因素,建立了汽车整体式转向梯形机构的优化数学模型,从四个方面对梯形机构进行优化设计。通过对这些结果的分析对比,得出了具有实用价值的结论。     

小模数齿轮传动重合度分析

本文分析了小模数渐开线齿轮传动的重合度与节圆压力角的关系,给出了增大重合度的设计方法。     

滚齿机传动链运动误差的频谱分析

用山东工业大学研制的圆感应同步器式运动精度测量仪配以TP801B—Z80单板计算机,完成了传动链运动误差的数据采集和处理工作。从数据采集开始,经十多分钟时间即可直接从数据处理结果找出机床传动链的薄弱环节,作出诊断结论,从而进行修理或调整机器,以提高机器的传动精度。