超声振动状态下PI和PTFE基复合材料的摩擦特性  

Tribological Characteristics of PI and PTFE Matrix Composites under Ultrasonic Vibration

作　　者：刘晓亮 孙胃涛 章健 Liu Xiaoliang;Sun Weitao;Zhang Jian(College of Electromechanical Engineering,Binzhou University,Binzhou 256600,China)

机构地区：[1]滨州学院机电工程学院,山东滨州256600

出　　处：《工程塑料应用》2022年第6期1-6,13,共7页Engineering Plastics Application

基　　金：国家自然科学基金项目(52075047);滨州学院博士科研启动基金项目(2019Y25)。

摘　　要：为明晰超声减摩机理,建立超声电机的界面接触状态与摩擦特性的对应关系,针对定子与聚酰亚胺(PI)和聚四氟乙烯(PTFE)基复合材料组成的摩擦副,搭建了超声振动摩擦实验平台,研究了定子齿结构、输入参数和环境因素对界面摩擦特性的影响规律。实验结果表明,定子齿结构明显放大表面质点的振幅,定子的谐振频率38.5 kHz处,定子齿对质点垂直振幅的提升幅度约为168%。在预压力作用下,定子齿结构与复合材料的嵌合作用会提高界面摩擦系数并降低超声减摩的幅度;质点振幅的垂直分量是导致超声减摩的主要因素,摩擦副的谐振频率41.5 kHz处,PI和PTFE基复合材料的超声减摩幅度分别为54.4%和40.7%;真空环境下,摩擦副相对运动时间非常短,产生的热量对界面摩擦特性影响不明显。In order to clarify the mechanism of ultrasonic antifriction,an ultrasonic vibration friction experimental platform was built to establish the corresponding relationship between the contact state and tribological characteristics of the ultrasonic motor.The effects of stator tooth structure,input parameters and environmental factors on the interface tribological characteristics of polyimide(PI)and Polytetrafluoroethylene(PTFE)matrix composites were studied.The experimental results show that the stator tooth structure significantly amplifies the amplitude of the surface particle.When the resonant frequency of the stator is 38.5 kHz,the vertical amplitude of the stator with tooth is increased about 168%.The normal preload enable the stator tooth structure to be embedded with the composites,which increase the interface friction coefficient and reduce the amplitude of ultrasonic antifriction.The vertical component of particle amplitude is the main factor leading to ultrasonic antifriction.When the resonant frequency of the tribo-pairs is 41.5 kHz,the ultrasonic antifriction amplitudes of the PI and PTFE matrix composites are 54.4%and 40.7%,respectively.In a vacuum environment,the relative movement time of the tribo-pairs is very shot,and the effect of generated heat on the interfacial tribological characteristics is not obvious.

关 键 词：接触状态 超声减摩 PI和PTFE基复合材料 质点振幅 

分 类 号：TQ323.7[化学工程—合成树脂塑料工业]