多面轴的几何设计和数控加工

从多面圆弧型截面的结构特征分析着手 ,给出了圆弧型多面轴的几何设计方法 ,从而获得数控磨削加工控制模型 ,按照该模型磨削圆弧型多面轴仅与面数、轴的最大外径和平均直径有关 ,而与砂轮直径的大小、工件毛坯的大小无关 ,且磨削多面孔时可用同一个数学模型。实际加工证明该理论是正确的 ,控制方法是可行的 ,为多面轴联接的推广应用奠定了基础。

行星机构另类应用的研究

基于把刀尖放在行星轮上运动轨迹为椭圆之点上的原理 ,提出一种可车正多面轴的行星机构的另类应用。论证了车削正多面轴的原理 ,推导出计算车多面轴之原理误差的数学模型与合理实施主轴头结构设计时关键尺寸参数确定的算式 ,给出了车正多面轴主轴头的结构图。

Failure analysis study of railway draw-hook coupler

Failure analysis of railway draw-hook coupler was carried out.The nondestructive testing method was undertaken on some failed couplers in service to designate critical areas of a coupler.Draw-Hook coupler is used to connect with the same hook coupler or automatic coupler.The influence of each connection types on the coupler strength in this study was discussed.A numerical stress analysis using FEM was performed,and many approaches including critical plane approach were carried out on fatigue life prediction of coupler under different conditions.The results of the proposed fatigue criterion and fatigue life predictions,as well as static numerical analysis,are validated with experimental results.

我国枪族化武器人机效能浅析

我国班用武器实现枪族化以来,发展很快,其战术、技术性能与人机效能等均有很大提高,但在使用中也暴露了一些不尽人意之处,本文主要就81枪族和新5.8mm小口径枪族人机效能中存在的问题作如下分析。