Relationship Between Friction Heat And Friction Coefficient Of Train Disc Brake Pads

The speed of train operation continues to create new heights with the advancement of technology and economic development,and safe operation has become a key issue of train operation.The high-speed train braking system is the key to ensure the safe operation of high-speed trains.The high-speed train braking system can be approximated as a heat exchange system.During the braking process,the braking system converts the kinetic energy of train operation into heat energy for dissipation.In order to provide a reference for improving the braking performance of the friction pair and the stability of the braking operation.In this paper,organic synthetic brake pads and powder metallurgical brake pads for high-speed trains are used as test samples.Based on classical friction theory,through disc-pin friction tests,two friction materials under different load conditions and speed conditions are studied.The friction coefficient and the change law of friction pair temperature.The main content and results of this article are as follows:1.Under certain speed conditions,the friction coefficient of powder metallurgy brake pad materials gradually decreases with the increase of load.Under certain load conditions,the friction coefficient of the powder metallurgy brake pad material transitions from low-speed operating conditions to medium-speed operating conditions has a small change,and there is a significant decrease in friction coefficient from medium-speed operating conditions to high-speed operating conditions.2.Under certain speed conditions,the friction coefficient of organic synthetic brake pad materials shows a significant decrease in the transition from low load conditions to medium load conditions as the load increases,and the transition from medium load conditions to high load conditions.The change rule of the friction coefficient is small.Under certain load conditions,the friction coefficient of organic synthetic brake pad materials is less affected by speed changes.3.Under the conditions of a certain relative sliding distance and a certain relative sliding speed.The vertical load weakens the friction coefficient and strengthens the vertical force,both of which affect the final measured temperature rise.For powder metallurgy brake pad materials,when the relative sliding speed is low,the temperature rise per unit distance of the side surface of the pin increases with the increase of the load.When the relative sliding speed is high,the temperature rise per unit distance decreases as the load increases.For organic synthetic brake materials,as the load increases,the temperature rise per unit distance on the side surface of the pin increases.4.Under the conditions of a certain relative sliding distance and a certain vertical load.The relative sliding speed weakens the final measured temperature rise,and the heat dissipation on the side surface of the pin enhances the final measured temperature rise.The enhancement effect of heat dissipation on the side surface of the pin is greater than the weakening effect of the relative sliding speed.In the experiment,both materials showed a change rule that the temperature rise per unit distance increased with the increase of the relative sliding speed.