基于粗糙齿面的矿用重载齿轮传动润滑效应研究

借助分形函数模拟齿面粗糙度,基于弹流理论建立了齿轮传动混合润滑模型,采用多重网格法进行了5组数值计算,从理论上探讨了润滑剂黏度对重载齿轮传动齿面接触应力的影响。结果表明:对齿轮润滑而言,合理选择润滑剂黏度十分重要。随着黏度的增大,齿轮润滑状态逐渐从边界润滑历经混合润滑过渡到全膜润滑;与此同时,由齿面粗糙度引起的压力波动减小、幅值降低且油膜厚度同时增大,所有这些均有助于提高齿轮传动齿面接触寿命。     

齿轮传动的弹流润滑设计

齿轮传动是最重要的传动形式之一,齿轮的良好润滑是保证齿轮正常传动的关键因素。齿轮润滑设计需要求得润滑油膜最小厚度。利用瞬态弹流润滑理论的多重网格数值技术,准确快速地获得了啮合点的最小膜厚,为根据膜厚比判定齿轮润滑状态提供了一种快速准确的方法。     

球磨机齿轮传动的润滑分析

基于永和新荣水泥有限责任公司球磨机的运行状况,运用弹流理论分析了在正常工况条件下,球磨机齿轮传动的齿面润滑状态可实现变粘度弹流润滑,并进一步分析了润滑剂和润滑方式的选择是保证弹性流体动压油膜存在及厚度的主要因素。     

矿用重载齿轮的弹流润滑数值分析

建立了重载齿轮传动的弹流润滑模型,采用多重网格、多重网格积分以及逐列扫描法,计算出压力、膜厚以及次表面剪应力等。结果表明:润滑油黏度和齿面综合速度同时改变时,随着润滑油黏度和齿面综合速度乘积的增大,平均膜厚单调增大,而次表面剪应力单调减小。载荷越大,次表面剪应力最大值的X坐标位置越靠近出油口的位置。     

球磨机齿轮传动的润滑分析

以大同市永和新荣水泥有限责任公司1.8m×7m球磨机为例,运用弹流理论分析了在正常工况条件下,球磨机齿轮传动的齿面润滑状态可实现变粘度弹流润滑,并进一步分析了润滑剂和润滑方式的选择,是保证弹性流体动压油膜存在及厚度的主要因素。     

考虑冲击载荷的直齿圆柱齿轮弹流润滑数值分析

应用多重网格技术,求得齿轮非稳态弹流润滑问题的完全数值解。分析了冲击载荷对齿轮弹流润滑的影响。在冲击载荷作用下,得到轮齿的摩擦因数、两轮齿接触点中心压力、中心膜厚、最小膜厚的变化规律,对分析齿轮传动问题具有重要意义。     

球磨机大齿轮润滑分析

以山东金岭铁矿φ２７００ × ２１００球磨机为例，运用弹流理论分析的结果表明，正常工况条件下，球磨机齿轮传动的齿面润滑状态为刚性体和变粘度弹流润滑。进一步从结构和负荷、润滑剂和润滑方法、维护和密封等方面分析得出，选择合适的润滑剂、合理的油池位置和搞好密封是实现弹流润滑的关键。     

基于弹流润滑理论直齿圆柱齿轮副润滑特性研究

针对直齿齿轮副高速重载状态下润滑条件破坏等问题,运用弹流润滑理论,考虑实际齿轮啮合条件,根据直齿齿轮运转动态特性建立齿轮副模型,研究了润滑油膜特性变化规律,提出了一种新型的计算模型。分析结果表明:新计算模型相对传统模型能够较好模拟载荷波动,新模型预测接触区域与传统模型相比较小;新型齿轮副润滑油膜特性分析模型预测出的中心油膜厚度曲线和最小油膜厚度曲线整体较传统模型大且波动性较大。     

弹流润滑条件下圆锥—圆柱齿轮减速器优化设计

齿轮减速器向高速、重载的方向发展,齿轮副的失效是由于润滑不良引起齿面的点蚀、胶合和磨损,其次是轮齿的折断和齿面的塑性变形。设计出既满足接触强度和弯曲强度条件,又满足弹流润滑条件,且结构尺寸小、重量轻。本文以圆锥—圆柱齿轮减速器为例,进行优化设计。     

弹流润滑在煤矿机械中的应用

本文着重论述了弹流润滑在煤矿机械齿轮、滚动轴承中的应用。其中介绍了什么是弹流润滑、弹流润滑膜厚度、膜厚比与零件寿命关系及其润滑参数的测定。用计算的方法可供在选用的润滑油中能选出一种最佳的润滑油。     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

2014 second batch of rare earth quota released

正~~     

矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586