摘要
合成闸瓦的测试过程中存在摩擦系数波动较大、测试结果重复性差等问题,一直困扰着合成闸瓦的检验检测,制约其制造技术的进步。采用1∶1制动动力试验台和定速摩擦磨损试验机系统研究了空走时间、真实制动初速度、温度对摩擦系数的影响,研究发现:摩擦系数受测试条件影响显著,延长空走时间能提高摩擦系数;摩擦系数随真实制动初速度的升高而降低;合成闸瓦在一定温度条件下具有较高的摩擦系数。综合分析发现,不同测试条件下合成闸瓦的黏合剂具有不同聚集态状态,不同的黏弹特性造成了摩擦系数的不同,这是造成合成闸瓦摩擦系数波动的主要原因。结合试验结论给出了测定合成闸瓦摩擦系数的建议,为细化合成闸瓦检验标准、提高闸瓦检测的重复性和再现性提供了数据支持。
In the test process of synthetic brake shoes,there are problems such as large fluctuations in friction coefficient and poor repeatability of test results,which have been plaguing the inspection and testing of synthetic brake shoes and restricting the progress of their manufacturing technology.The effects of pressure increasing time,true initial braking speed and temperature on the friction coefficient were studied by using a full-scale dynamometer brake test bench and a constant speed friction and wear testing machine.It is found that the friction coefficient is significantly affected by the test conditions,and the friction coefficient can be increased by extending the pressure increasing time.The coefficient of friction decreases with the increase of the true initial braking speed;The synthetic brake shoe has a high coefficient of friction under certain temperature conditions.The comprehensive analysis shows that the adhesives of synthetic brake shoes have different aggregation states under different test conditions,different viscoelastic characteristics resulting in different friction coefficients,which is the main reason for the fluctuation of friction coefficients of synthetic brake shoes.Combined with the test results,suggestions for the determination of friction coefficient are given.The conclusions of this study provide data support for refining the inspection standard of synthetic brake shoe and improving the repeatability and reproducibility of brake shoe detection.
作者
裴顶峰
王京波
刘昆
黄毅
贺春江
胡崇
吉媛
徐洋
PEI Dingfeng;WANG Jingbo;LIU Kun;HUANG Yi;HE Chunjiang;HU Chong;JI Yuan;XU Yang(Metals and Chemistry Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;Locomotive&Car Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;Department of Locomotive and Car,China State Railway Group Co.,Ltd.,Beijing 100844,China)
出处
《高速铁路新材料》
2025年第1期37-41,共5页
Advanced Materials of High Speed Railway
关键词
空走时间
合成闸瓦
摩擦系数
黏弹特性
pressure increasing time
synthetic brake shoe
friction coefficient
viscoelastic characteristics
作者简介
第一作者:裴顶峰(1969-),男,研究员,博士。E-mail:peidingfeng@163.com。
