Effect Of Electromagnetic Induction Of Friction Pair Contact Surface On Friction And Wear Properties In Dc Magnetic Field

With the development of mechatronics and the diversification of mechanical equipment, the effect of electromagnetic field on the properties of mechanical equipment friction pair parts is becoming bigger and bigger as well as the research of friction and wear properties of friction pair in magnetic field.In this paper, Maxwell Ansoft simulation software is used to build up a pin and disk contact 3D finite element model to analyze the distribution of magnetic field in different magnetic attraction force; 2D asperities contact finite element models in static and transient magnetic field are built according to the pin-on-disk friction tester structure and the actual contact condition of the pin and disk during the friction process in the magnetic field to analyze the electromagnetic induction phenomena in the friction contact area of pin and disk caused by dynamic changes of contact points. Through conducting friction and wear tests on a pin-disk tribometer in different parameters, on the basis of the tests results and testing results, the effects of the distribution of magnetic field and the electromagnetic induction phenomena of friction contact surface on friction and wear properties are analyzed. The following conclusions are obtained:The magnetic field mainly distributes in pin and disk friction area, its distribution is uneven, the magnetic induction B nearby the contact area of asperities is larger while B is smaller in not contacting area. The magnetic field can attract oxygen molecules to asperities contact area, increase oxygen partial pressure, and promote the oxidation of wear surface and wear debris. During the friction movement between pin and disk, high frequency dynamic magnetizing, induced current and induced electromotive force in asperities contact area of wear surface and wear debris are generated to promote the oxidation of wear surface and wear debris, thus affecting friction and wear process. Applying DC magnetic field can decrease the wear rate of 45 steel pin and disk friction pair, and promote the transition of severe-to-mild wear.