Effect of surface treatments on the strength of carburized gears

This paper deals with effects of surface treatment on the bending fatigue strength of SCM415 carburized spur gears. The test gears are treated by the combination of shot peening, chemical polishing and electropolishing after carburization. The fatigue tests demonstrate that the strength is sensitive to the surface condition of tooth fillet and the removal of the nonmartensitic layer caused by decarburization is considerably effective in enhancing the strength. In the first part of this paper, the influence of surface treatments such as shot peening, chemical polishing and electropolishing on the strength enbancement for carburized gears are summarized and discussed. In the second part, the crack lengths are calculated from the fatigue test results for the carburized and surface-treated gears, and the effect of surface treatments is discussed from the view point of fracture mechanics.     

Dynamic optimization of spur gears

This paper presents a global optimization method focused on gear vibration reduction by means of profile modifications. A nonlinear dynamic model is used to study the vibration behavior; such model is validated using data available in literature. The optimization method considers different regimes and torque levels; the objective function can be the static transmission error or the maximum amplitude of the gear vibration in terms of dynamic transmission error. The procedure finds the optimal profile modification that reduces the vibrations over a wide range of operating conditions. In order to reduce the computational cost, a Random-Simplex optimization algorithm is developed; the optimum reliability is estimated using a Monte Carlo simulation. The approach shows good performances for the computational efficiency as well as the reliability of results. Finally, an application to High Contact Ratio (HCR) gears is presented and an extremely good performance is obtained by combining optimization procedures and HCR properties.     

锥齿轮传动质量智能检测分析方法及系统研究

研究了一种能自动完成锥齿轮传动质量检测。智能地分析评判其传动质量。并能够确定最佳安装调整位置的检测分析系统。阐述了利用锥齿轮副啮合引起的噪声和系统主轴箱的振动来评价锥齿轮副传动质量的方法。提出了检测系统的设计方案和基于LabVIEW的测控软件实现方法。开发了系统样机。实验表明了利用锥齿轮副啮合所产生的噪声和振动进行质量评价和最佳安装距追踪的有效性。研制的系统解决了传统锥齿轮滚动检查机只能人为定性评价锥齿轮传动质量。不能给出锥齿轮最佳安装位置这一技术难题。对控制和提高锥齿轮的产品质量具有重要意义。     

齿轮疲劳裂纹特征及诊断方法

本文以齿轮为研究对象，对齿轮齿根裂纹的表现特征及其诊断方法进行了研究，综合运用多种方法对齿轮振动信号进行了分析，成功地识别出了齿轮裂纹的存在。     

复杂工况下齿轮接触强度的可靠性优化设计

试图利用ＩＳＯ及ＧＢ３４８０－８３齿轮承载能力计算标准的齿轮接触强度数据，对非稳定循环变应力等复杂工况下齿轮接触强度进行可靠性优化设计，并通过利用计算机，使该方法得以更为有效地实施。     

变角度弯销注塑模设计

分析了泵体的工艺特性，论述了泵体注塑模的结构设计和工作过程。该模具巧妙地采用变角度弯销侧向抽芯机构，解决了长距离抽芯模具尺寸较大的问题，简化模具结构，提高生产效率。该设计思路对类似形状的塑件成型有一定的参考价值。     

数字化成形加工技术的研究与应用

本文首先论述了数字成形加工技术的内涵及其技术路线,接着论述了数字化成形加工技术在国民经济中的地位与作用,最后介绍了轿车差速器锥齿轮和纺织机械中YJ2-142摇架手柄两个典型零件数字化成形加工技术的应用实例。     

基于UG的弧齿锥齿轮建模新方法的研究

介绍了一种基于UG的接触区主动控制的弧齿锥齿轮建模方法。首先使用成形法得到大轮；然后采用变异的铣刀盘成形加工得到变异大轮，再依据共轭原理，利用变异大轮展成小轮毛坯实体得到小轮齿面。按照此方法基于UG软件实现了一对21—35齿的弧齿锥齿轮副的建模。该方法基于传统的格里森弧齿锥齿轮加工方法，有创新之处，是格里森弧齿锥齿轮建模和加工的一种实用的新方法。     

一类齿轮系统动力学模型建立和求解的研究

以渐开线直齿圆柱齿轮为例,运用机械结构动力学建模理论,在考虑存在啮合齿轮对之间的摩擦力、偏心质量及齿轮啮合综合误差等因素时,建立了齿轮传动系统较为完整的非线性动力学模型,并求解出由于轮齿啮合造成的耦合等动力特性.进而分别采用MATLAB语言编译的程序和有限元软件ANSYS对所建立的动力学模型进行计算及分析研究.     

数控磨齿机与"M类"铣齿机加工参数的转换

基于齿轮加工工艺的需求,以YK2050数控螺旋锥齿轮磨齿机和Y2280机械铣齿机为例,推导了将“M类”机械式铣齿机加工调整参数转化成数控螺旋锥齿轮磨齿机调整参数的原理及公式。通过实验证明,该转换方法正确可靠,满足齿轮加工工艺的要求。