润滑油黏度对高速球轴承性能及损伤的影响

为探究高速工况下润滑油黏度对轴承润滑状态及性能的影响,试验研究了Si_3N_4陶瓷和GCr15轴承钢材质的7014C型角接触球轴承在不同润滑油黏度条件下的温升和振动特性.结果表明,轴承温升及振动随润滑油黏度的增大呈现出先下降后上升的趋势,影响程度随转速的增大而增大.同时,陶瓷轴承较钢制轴承在不同润滑油黏度条件下均表现出更优越的性能.将试验结果与轴承润滑状态分析结合,讨论了润滑油黏度、润滑状态、轴承性能三者的关系,为高速角接触球轴承适用润滑油黏度的选择提供了重要依据.此外,本文还对不同润滑条件下的轴承滚动面损伤进行了分析.结果显示,全膜弹流润滑条件下,陶瓷轴承与钢制轴承滚动面损伤较小且差异不明显.部分膜弹流润滑条件下的轴承滚动面损伤严重,表面出现大量凸峰和凹谷,轴承滚动体及外滚道表面损伤较内滚道严重,钢制滚动体的表面划痕较陶瓷滚动体密且深.     

α-烯烃在合成润滑油领域的应用

概述了α-烯烃在合成润滑油领域的应用。介绍了聚α-烯烃合成润滑油的生产现状、α-烯烃生产技术以及α-烯烃制备PAO研究进展,分析了各种生产技术的主要特点,指出了我国PAO领域存在的问题,并对我国PAO的发展提出了建议。     

倍捻时使用润滑脂问题浅析

根据工厂的实际情况,对倍捻机使用润滑脂的问题进行剖析,并对目前工厂存在的工艺缺点进行分析,减少甚至不使用润滑脂,从而达到符合当今倡导低碳生活的主题,在减少产品成本的同时达到环保理念的目的。     

干式拉丝机模盒及润滑装置改进

常用干式拉丝机模盒及润滑装置存在的问题:润滑粉易结焦,导致润滑失败;干摩擦造成拉丝模使用寿命缩短;钢丝力学性能差,拉丝模、润滑粉消耗大。模盒及润滑装置改进后,润滑粉可以在润滑粉盒内循环流动;拉丝模工作时可以旋转;拉丝模冷却由敞开式水冷变为封闭式压力水冷。使用改进后装置生产的φ5.05 mm钢丝弯曲值由原来的8次增加到12～15次;伸长率由0.1%～0.5%增加到1.5%～2.0%;生产吨钢丝拉丝模消耗由0.25～0.35块降为0.13～0.15块,润滑粉消耗由0.7～1.0 kg降为0.4～0.7 kg,电耗由230～250 kW·h降为180～190kW.h;生产100 t成品钢绞线发生断丝的次数由原来的5～8次降为0.5次。     

钢丝拉拔润滑剂使用过程中有效成分分析及监控

水基镀黄铜钢丝拉拔润滑剂中起润滑作用的主要成分是含磷极压剂和合成脂肪酸酯油性剂。试验采用重量法测总磷与无机磷含量,从而得到有机磷含量;酯类油性剂不溶于水,必须用乳化剂将其乳化,分析其含量必须先破乳、分离,分离后分析其皂化值及酸值,即可得到酯含量。该分析方法实际操作性强,可快速有效地检测润滑剂中主要成分的含量,适用于润滑剂有效成分的分析和过程监控。     

羊毛梳理纺纱用油剂（和毛油）的发展

介绍和毛油剂的发展概况,以及油酸、植物油、矿物油、合成和毛油的构成和性能,并对国内外和毛油剂的应用现状和研究方向作了综述。     

水基链条润滑剂的研制

研制了一种输送带水基链条润滑剂,该润滑剂由表面活性剂、抑菌剂、阻垢剂、防锈剂等组成研制的.输送带水基链条润滑剂与进口产品进行比较,表明研制的水基链条润滑剂具有润滑性能好、去污、抑菌、低泡、抗腐蚀等优点.     

XPS and XANES characteristics of tribofilms and thermal films generated by two P- and/or S-containing additives in water-based lubricant

Two phosphates were synthesized and their tribological properties as water-soluble lubricant additives were evaluated by using four-ball tester. The micro/nano-scale chemical characteristics of tribofilms and thermal films formed from these additives in different conditions were explored by X-ray photoelectron spectroscopy (XPS) and X-ray absorption near-edge structure (XANES) spectroscopy. The results show that the additives have better anti-wear and friction reducing properties than the oleate solution at higher load. Surface analysis results indicate that tribofilms are mainly composed of absorbed layer and chemical reactant layer, in which phosphorus exists in the form of adsorbed molecule, phosphate or polyphosphate, and sulfur in the form of alkyldisulfide, sulfide and sulfate. As to the thermal films, phosphate (or polyphosphate) and sulfate are detected as the main components. The anti-wear and friction-reducing performances can be ascribed to the formation of films on the metal surface, and the mechanism of the process of molecules adsorption, new compounds production through tribochemical reactions, film formation and destruction.     

Construction of phase diagram up to 2 GPa and 200°C for thermo‐reversible gel lubricants by diamond anvil cell

The objective of this research was to make the phase diagram up to 2.0 GPa and 200°C of thermo‐reversible gel lubricants (TR Gel‐Lube) using diamond anvil cell (DAC). TR Gel‐Lube consisted of base fluid and gelling agent. The most important characteristic of TR Gel‐Lube is the reversible change of its physical state. The DAC is able to concerning visual observation of the sol/gel and liquid/viscoelastic–solid transition at high pressure and high temperature. DAC enables the visual observation of the photoelastic effect in order to generate local principal stress difference under the compression field for liquid/viscoelastic‐solid transition of base oil poly‐α‐olefin. The direct observation for sol/gel transition of TR Gel‐Lube at high pressure was also made possible. The phase diagram corresponding to transition from liquid to viscoelastic solid for base oil poly‐α‐olefin and sol to gel for TR Gel‐Lube was made by using DAC. Copyright © 2009 John Wiley & Sons, Ltd.     

圆锥滚子轴承阻尼的计算方法

在对圆锥滚子轴承进行受力分析的基础上,利用弹性流体动力润滑理论,得到承载最大滚子与内、外滚道间的最小油膜厚度计算式,并将其引入滚动轴承阻尼计算过程,建立了包含轴承滚子阻尼和油膜阻尼的轴承综合阻尼计算模型.