XW型蜗轮材料研究

采用正交试验法筛选出一种ＸＷ型蜗轮材料；与ＺＱＳｎ１０－１型青铜蜗轮相比，ＸＷ型材料蜗轮在传动效率，热平衡温升，耐磨寿命和成本等方面具有明显优越性；ＸＷ型蜗轮材料投产投资仅为ＺＷ－１型蜗轮材料的十分之一，便于工程推广应用。     

6吨真空抬包蜗轮蜗杆的设计计算

某国某铝厂建厂时从中国采购的8台6 t真空抬包目前已使用将近5年时间,减速机中的蜗轮蜗杆机构磨损严重,已影响正常的生产工作,因此考虑到降低采购成本、提高倾转效率的目的,本次设计对原有减速机蜗轮蜗杆机构进行重新设计,由2级蜗轮蜗杆机构改进为3级蜗轮蜗杆机构,并经过详细的力学分析和公式计算确定了蜗轮蜗杆的详细参数和工艺指标,并交由当地机械加工厂进行加工生产,目前已完成该8台6 t真空抬包的改造,运行良好,为铝厂降低了直接生产成本。     

蜗轮加工的实践和研究

系统介绍了蜗轮飞刀工作原理，阿基米德蜗杆法向齿形的曲线模拟法、圆弧模拟法、直线模拟法．及其在具有切向走刀机构的滚齿机上的应用。在维修设备遇到无法使用标准蜗轮刀具加工时，这是一种简单实用的蜗轮加工方法。     

新型蜗杆传动——首钢—71型蜗轮副

首钢—71型蜗轮副是一种新型蜗杆传动,具有承受载荷大,传动效率高,使用寿命长等优点,体现着蜗杆传动科学研究的最新成果。在平面包络蜗杆传动中,威尔德哈泊型(Wildhaber Worm)和普拉那蜗轮(Plana Worm)是大家熟悉的。前者的蜗轮齿平面与其轴心线平行,后者的蜗轮齿平面与轴心线倾斜一个角度,在我们看来,二者都是平面一次包络的蜗轮     

八头高速蜗杆副的国产化研制

在分析八头高速蜗杆传动使用要求和使用条件的基础上，对蜗轮蜗杆进行重新优化设计．采用Nieman蜗杆齿形，同时采用了一系列特殊加工工艺及提高蜗轮蜗杆的加工精度和啮合精度措施，使新研制的蜗轮蜗杆达到了国产化的目标和生产使用要求，取得了较为满意的结果。     

ZE型蜗轮组的数学模型

本文推出的ZE型蜗轮组数学模型是根据机床设计参数、成套机床工具、蜗杆以及蜗轮切割装置建立的。蜗轮组的轮齿间隙都已估算在数学模型中，这种数学模型对于设计、啮合与应力分析、制造测试以及优化蜗轮组都是非常有益的。还研究了小型蜗轮切割机飞刀的外形。文中绘制的三维计算机图形可作为数学模型的证明。     

锌合金蜗轮和铝青铜蜗轮弯曲强度和耐磨性研究

对锌基耐磨合金蜗轮和铝青铜蜗轮弯曲强度和耐磨性能进行了实验研究,结果得出,锌基合金的蜗轮较好。     

英制蜗轮改为公制蜗轮与原英制蜗杆配合的设计制造

本文介绍英制蜗轮改制为公制蜗轮的设计加工制造，改制后公制蜗轮仍能满足与英制蜗杆的配合传动要求。     

高炉罐式炉顶齿轮箱故障分析及改进措施

高炉罐式炉顶齿轮箱主要故障点是旋转支撑、倾动箱及行星减速机。旋转支撑承受载荷大,通过增加滚动体、均匀内部间隙等措施,优化回转支撑;倾动箱蜗轮齿易局部磨损、蜗轮轴与溜槽挂架易抱死,通过在蜗轮花键轴处增加氮气吹扫与冷却、加强密封、强制干油润滑等,消除了倾动箱故障;行星减速机各轴承因各种杂质形成回转卡阻,通过加设稀油冷却及油过滤装置、及时清理油污等,防止了轴承失效。优化改造后,齿轮箱运行稳定性提高,隐患部位大幅度减少。     

立盘过滤机主传动蜗轮的磨损失效及解决办法

主要从蜗轮的受力、安装、润滑和散热等方面，对蜗轮的磨损原因做出分析，并提出了解决办法。     

棒材轧机压下蜗轮副加工工艺的理论分析及实践

根据圆柱蜗杆与蜗轮的传动啮合原理，阐述了普通齿轮滚刀代替专用蜗轮滚刀滚切蜗轮的可行性，并在制造棒材连轧机压下装置中应用，取得了良好效果。     

蜗轮丝杠直顶式升降平台

主要论述多台蜗轮丝杠直顶式升降平台的设计思想，介绍其结构特点、传动方式、同步控制、定位控制的方法。     

平面一次包络环面蜗杆传动圆盘式给料机的传动效率

动力蜗杆传动的综合质量指标是承载能力和传动效率．通过平面一次包络环面蜗杆传动圆盘式给料机与普通圆柱蜗杆传动圆盘式给料机的效率实验，对比二者的差异，又通过蜗轮蜗杆啮合时接触线及接触线和滑动速度之间夹角的分析，说明平面一次包络环面蜗杆传动圆盘式结料机在效率上优于圆柱蜗杆传动圆盘式给料机．     

高密度烧结金属齿轮的承载能力(英文)

This paper describes a study on the load bearing capacity of newly developed high density sintered metal gears with surface - densification. High density sintered metal gears were hobbed, and then surface - rolled. These gears were case - carburized after surface - rolling. The effect of surface - rolling on the surface property was examined by measuring porosity, and hardness near surfaces of rolled gears. Running tests for these gears were performed. A failure mode and load bearing capacity of high density sintered metal gears and the effects of surface - rolling on the load bearing capacity of sintered metal gears were determined, and the results were compared with those of carburized wrought steel gears and conventional sintered metal gears. The experimental results show that the load bearing capacity of a newly developed high density sintered metal gear with surface - densification is higher than that of a carburized wrought steel gear.     

表面致密化--一种提高烧结齿轮性能的有效方法

表面致密化与传统的粉末冶金方法相结合，可以显著改善烧结齿轮的疲劳及表面磨损性能。从而提高齿轮的寿命，同时使生产高性能齿轮的总成本降低，为用粉末冶金(PM)方法生产汽车变速箱齿轮提供了更大的可能性。本文着重讲述了使用这种方法生产高性能PM齿轮的工艺过程，同时介绍了测定致密化效果及齿轮性能的几种主要方法，并根据工艺过程比较了使用传统的机加工方法及本文所述的方法生产同性能齿轮的成本差别。最后，以两个实例分别介绍了使用上述方法对Volvo 850系第五挡变速齿轮及Scania载重车变速箱中行星齿轮的研发。     

An advanced method for the manufacture of gears (review)

Summary Metal powder methods can be used in the manufacture of gears of many different shapes. They enable high precision gears with a high quality of finish to be made with a small number of operations which do not involve machining. These methods enable the production time to be considerably reduced (up to 58%) and the cost cut (up to 86%).The gears made by this technology have a number of special properties which improve their operational qualities.Metal powder gears are less noisy than solid gears and, owing to their self-lubricating properties, resist wear better.     

双重差动机构在滚齿机分齿上的分析与研究

传统的由齿轮链传动的滚齿机难于加工大于 10 0的大质数齿数齿轮 ,而滚切斜齿大质数齿数、大模数齿轮就更困难 ,且生产率十分低 .本文提出的双重差动齿轮机构能有效地实施大质数齿数齿轮的分齿运动 ,大大提高生产率 ,并且只需配备相当于传统滚齿机 1/2的交换齿轮就能满足2 50以下所有齿数齿轮的分度 ,显然这是一种很有价值的分齿机构     

Population dynamics of the parasitic stages of Oesophagostomum dentatum in pigs in single and trickle infections

A mathematical model was developed to describe the dynamics of the parasitic stages of Oesophagostomum dentatum in pigs. An immigration-death model with constant establishment, development and death rates was fitted to L3, L4 and adult worm burdens observed in a single-infection experiment. Female worm length was modelled by a function of worm age and total worm burden, while worm egg production (eggs per gram faeces per female worm) was modelled by a function of worm age and worm length. The model was then used to predict worm burdens observed in a trickle-infection experiment. The predicted worm burdens were much higher than those observed, suggesting that worm death rates were higher during the trickle infection. After increasing worm death rates to fit the observed worm burdens, female worm lengths and egg production in the trickle infection were predicted. At the medium- and high-dose rates, predicted worm lengths and, thus, egg production were lower than observed, while at the low-dose rate predicted egg production was too high. It appeared that in the trickle infections, total worm burden had less influence on observed female worm length and egg production than in the single infections. The results suggest that the demography of O. dentatum in pigs differs between single and trickle infections.     

双压力角齿廓齿轮齿根弯曲应力有限元分析

根据齿轮齿根弯曲应力有限元法的一般计算步骤,并利用有限元分析软件ANSYS5.7对两种不同齿形的双压力角非对称齿廓渐开线齿轮和对称渐开线齿轮在单齿啮合区时和双齿啮合区的应力场以及位移场进行了计算;有限元分析软件计算所得的轮齿位移场和应力场与实际情况相符,而且与常规解析法计算结果变化趋势基本一致。