锥齿轮制造工艺的改进

针对ZJ30钻机重载锥齿轮使用寿命短的问题,探讨了锥齿轮早期疲劳破坏的原因和影响因素,综合分析认为,锥齿轮早期失效的主要原因是齿面硬化层深度不够。为此,从锥齿轮表面淬火工艺上开展试验研究,提出锥齿轮如下处理工艺:齿轮整体采用调质处理,心部硬度30～35HRC;齿面采用20～50kHz中频感应淬火处理,硬化层深度2.0～3.0mm。油田现场应用表明,采用上述改进工艺后,锥齿轮的使用寿命由原来的不足1000h延长至2000h以上。     

Oxidation stability of lubricating base oils

The oxidative stability of three base lubricating oils of different grades light, medium and heavy oils (B1, B2 and B3, respectively) was studied at oxidative times 50, 100 and 150 hours. The quality of base oils under investigation were evaluated on the basis of total acid number, vaporization loss, kinematic viscosity and quantity of sludge formed. Also, the chemical composition of the studied lubricating oils was achieved via capillary gas chromatography. The comparative study of the oxidative performance of the base oils showed that the higher degrees of heavy oil than light one. The increase in the oxidation time led to increases of the evaporation loss and lubricant viscosity. Analysis of a lubricant's oxidation stability therefore contributes to a better understanding of its effectiveness under normal operating conditions and its suitability for formulating automotive lubricants. The aim of this work is the study the Potential life of lubricant oils inside engine motor at different oxidative times in view of their oxidation stability.