温成形界面粉末润滑的摩擦特性与表面膜分析

Frictional characteristic and surface film analysis on powder lubrication of warm forming interface

在温成形过程中,由于需要达到一定的温度且压力较大,传统的油脂已不能实现有效润滑甚至失去润滑能力,而固体粉末润滑的优点显得十分突出,固体粉末的静态承载特性和环境适应性使其在温成形中广泛应用。本文采用环境可控多功能摩擦磨损试验机,在一定温度条件下进行粉末润滑特性试验来研究载荷、转速对粉末润滑特性的影响,并对摩擦系数、润滑膜表面状况作出分析评价。结果表明:粉末润滑在低载荷情况下,能正常工作,磨损不严重;适当增加载荷,摩擦系数会降低,但表面磨损会加重;适当增加转速可以有良好的减摩效果;同等载荷的情况下,提高转速会加速磨损。

In the warm forming process, the traditional oil and grease have been unable to achieve effective lubrication and even lost the ability of lubrication because of the requirements of high temperature and large pressure. However, the advantage of powder lubrication is obvious, and it is widely used in the warm forming based on static load characteristics and environmental adaptability. The experiment of power lubricating characteristics at a certain temperature was carry out to research the influence of load and rotate speed on powder lubrica- ting characteristics by the muhi-function environment controllable friction and wear testing machine. Then the coefficient of friction and condition of lubricating film surface were analyzed and evaluated. The results show that the powder lubrication can work normally under low load condition, and the sample does not wear seriously. The friction coefficient decreases with the load increases properly, so the sample has a sharp worn surface. A good anti-friction effect is realized by proper increasing of the speed. Under the equal load, improving rotate speed can accelerate the wear.