Research On Friction And Noise Property Of Multi-body Plane Contact Interface

Plane contact friction pair is widely used in many areas in engineering application, such as machine tool guideway, oscillating bearing and so on. In the working lifetime of friction pair, the friction interface transforms to three-body friction interface from two-body friction interface because of the formation of debris and the ingested particles from outside. The size and quantity of the third-body particles have an extraordinarily complicated influence on the tribological performance of friction pairs, which is extensively researched by many domestic and international researchers.A small plane contact friction testing system was established to study the tribological performance of muti-body friction interface and explore the effect of third body in friction interface and the granular properties in three-body friction process. The testing system is based on UNIPOL-810lapping machine, with it’s movement formation of plane contact unchanged. Redesigned the support part to fix the pull pressure sensor and sound level meter. Designed data acquisition circuits, debugged the system to accurately measure the friction force and noise of the interface in real time. Two groups of experiments were conducted with this system to study the friction characteristics of the process changing from two-body friction to three-body friction (TFP) and pure three-body friction respectively. For TFP experiments, use abrasive paper and304stainless steel as friction pair to study the effects of particle size on abrasive paper, load and relative speed of friction interface on its friction and noise performance. For three-body friction process, add particles in the formation of suspension to friction pair made up of cast iron and304stainless steel. And study the effects of particle size, load, speed and the concentration of suspension on tribological property. Results show that:for TEP tests, the friction force between the interface decrease rapidly at first then increase gradually to a stable state in almost all of the conditions, and it increase with the increase of particle size, load and rotate speed. But for three-body friction process, the friction force are basically stable and decrease with the increase of particle size or the decrease of load. Noise of the interface decrease gradually to a stable state for TEP tests, and the stable value increase with the decrease of particle size and relative speed, while load has little effect on it. For three-body friction process, the friction force reach at maximum when the concentration is minimum. But the friction force decrease and are almost the same when the concentration exceeded certain value, which indicate the granules in the interface plays a role as lubricant.