机械密封磨合过程端面接触特性

本资料包含pdf文件1个，下载需要1积分

In order to study the change of contact characterizations of end faces in mechanical seal running-in,taking into account the difference between real micro contact area and micro contact cross-sectional area of end faces of mechanical seals,the expressions of the micro-contacting areas related to the critical elastic and plastic deformations were revised.The expressions of elastic contact area ratio,elastic-plastic contact area ratio and plastic contact area ratio for mechanical seals were derived.Running-in tests of B104a-70 mechanical seals were made with water as test medium.Test temperature was 20℃.Test pressure was 0.5 MPa.Spring pressure was 0.15 MPa.Rotating speed was 2900 r?min-1.The results showed that the end face of the soft ring tended to be smoothened rapidly and its wear rate decreased quickly in running-in.The contact characterizations between end faces of mechanical seals changed greatly.The normalized real contact area increased from 0.00348 to 0.00567.The elastic contact area ratio increased from 0.716 to 0.822.The elastic-plastic contact area ratio decreased from 0.231 to 0.128.The plastic contact area ratio decreased from 0.053 to 0.050.为研究和掌握机械密封磨合过程端面接触特性的变化规律,考虑机械密封端面微凸体实际微接触面积与微接触截面积之间的区别,对微凸体临界弹性变形微接触面积和临界塑性变形微接触面积的表达式进行修正;推导得出机械密封端面弹性接触面积比、弹塑性接触面积比和塑性接触面积比的表达式。对B104a-70型机械密封进行磨合试验,试验介质为20℃清水,压力为0.5MPa,弹簧比压为0.15MPa,转速为2900r.min-1。研究结果表明,随着磨合过程的进行,软质环端面迅速趋于光滑,磨损率迅速减小;磨合使密封端面间的接触特性发生了较大的变化,量纲1真实接触面积由0.00348增大到0.00567,弹性接触面积比由0.716增大到0.822,弹塑性接触面积比由0.231降低到0.128,塑性接触面积比由0.053降低到0.050。