磁流变抛光用蠕动泵软管失效模式及损伤演变

Failure Mode and Damage Evolution of Peristaltic PumpHose for Magnetorheological Polishing

蠕动泵软管回收系统是磁流变抛光液循环系统中的关键组成部分,直接影响抛光液流量的稳定性。为了保证长时间磁流变抛光的可靠性,这里研究了磁流变抛光用蠕动泵软管失效模式及损伤演变规律。首先,对蠕动泵软管的失效模式进行了分析,建立了受力模型并仿真计算,获取了软管的易失效位置;然后,通过实验的方法对软管已失效处的截面损伤情况进行观察,分析损伤裂纹的特征,将最大损伤深度作为表征参数,研究其演变规律;最后,根据实验参数,建立了蠕动泵软管的寿命离线预测模型。结果表明:使用常规氧化铈抛光液,在转速为300rpm的条件下,软管的磨损过程有三个阶段:磨合磨损阶段、稳定磨损阶段、剧烈磨损阶段。该蠕动泵软管的稳定运行寿命为16h,与实际情况较为符合,模型具有较强的指导意义。

The peristaltic pump hose recovery system is one of the key components in the magnetorheological polishing fluid circu-lation system.The performance of the system directly affects the stability of the polishing fluid transportation.In order to ensure the reliability of continuous magnetorheological polishing process,the failure mode and damage evolution of peristaltic pump hose for magnetorheological finishing is studied in this paper.First,the failure mode of the peristaltic pump hose is analyzed,the force model is established and simulated,and the vulnerable position of the hose is gained.Then,the situation of section damage in the failure position is observed through experimental method,the feature of the damage crack is analyzed,and the maximum depth of crack is taken as the characterizing parameter to study the development law of damage.Finally,the off-line life prediction mod-el of the peristaltic pump hose is established according to experiments.Results indicate that,The hose wear process has three stages(running-in wear stage,stable wear stage,severe wear stage)under the condition of rotation speed of 300rpm using convention-al cerium oxide polishing Fluid.The replacement of the peristaltic pump hose is predicted to be in 16h,which is consistent with the actual situation,and the proposed model shows a strong guiding significance.