Abstract: Mechanical power equipment often because of bad operation condition affecting the face friction pair clearance of wear serious, in order to discuss joint changes in operation in the process of friction pair clearance and wear behavior and mechanism of action, to a certain type excavator as an example, based on dynamics simulation analysis under two kinds of typical working condition of the movable arm joints based on dynamic load data, Using finite element numerical simulation technology and correct Archard wear model calculated friction pair clearance in the relationship between the number of wear depth and wear, in the end wear test machine to verify two joint clearance under the condition of abrasion and gasket change process, and observed under scanning electron microscopy (SEM) analysis of surface topography after wear and wear mechanism. It turns out that the wear areas are annular in both conditions. In off-load condition, the wear is mainly related to the contact stress value and off-load Angle. During the wear process, the surface produces cone-punctured pits and cross furrows, and the wear mechanism changes from fatigue wear to adhesive wear, accompanied by a small amount of abrasive wear. At full load, the wear is mainly related to the degree of contact and collision, and the wear forms are adhesive wear and abrasive wear. This method of analysis has a good reference value for the construction machinery industry to analyze other power equipment joint friction pairs and engineering applications.

Key words: face friction pair, excavator, typical working condition, wear areas, wear mechanism