高速载流摩擦接触面温度的特性

Contact Surface Temperature Characteristic in High Speed Current-carrying Friction System

高速载流摩擦过程中,温度是影响摩擦副相互摩擦产生磨损的重要因素。为了解接触面的温度特性,通过对接触面温度进行瞬态热分析,建立了高速载流摩擦试验机温度场计算模型,给出了不同条件下接触面温升变化规律,并采用红外测温方法进行实验验证。结果表明：在高速载流摩擦过程中,加载电流在200~300 k A条件下,电弧热量是影响接触面瞬态高温的主要因素。在固定摩擦件同一位置处,加载电流越大,温度越高,但接触面最高温度值增加幅度并不明显。根据所建接触面温度模型和温度测量方法得出的高速载流摩擦过程中温度的分布情况,有利于表征摩擦副间接触状态,可为降低高速载流摩擦在高温下的磨损损伤程度提供有力的技术支持。

In a high speed current-carrying system, temperature plays a key role in wear between the friction pair. Therefore, it is necessary to research the characteristics of contact surface temperature in high speed current-carrying system. Based on the research of thermal analysis on transient temperature of contact surface, a temperature caculation model of the high speed current carrying friction testing machine was established, and the temperature rise of the contact surface area was simulated. Moreover, an infrared temperature measurement method was adopted to verify the simulation in the experiments. The results show that arc heat is the predominant factor in causing transient high temperature under the loaded current of 200~300 k A in the high speed current-carrying system. At a certain location, the greater the load current is, the higher the temperature will be. However, rises of the highest temperature of contact surface are not obvious. Distribution of contact surface temperature, which is beneficial to characterize the contact state between friction pair, is showed by the temperature model and temperature measurement in the paper. The study provides a strong reference value for reducing the wear and damage in high temperature.