The Friction And Wear Test And Electromagnetic Field Analysis Of Pin-disk Friction Pair Under DC Magnetic Field

Due to the diversification and complication of mechanized equipment andmechatronics, the influence of electromagnetic characteristics on the performance ofparts in friction pair of mechanical equipment is more and more significant, so itbecomes more and more important to study the friction and wear performance offriction pair in the magnetic field. The impacts of magnetic field distribution andelectromagnetic induction phenomena on the friction properties are studied, and thispaper combines the electromagnetism with the tribology. This is important to thetheoretical research of the magnetic field tribology.The normalizing ferromagnetic45steel is used as mainly study subject in thispaper. An pin-on-disk wear tester which is own made and the electromagnetic finiteelement analysis software are utilized to test and simulation calculation. The impactsof magnetic force between the pin-disk friction pair and electromagnetic inductionphenomena on the friction properties are studied. The following conclusions can bedrawn:1With the increasing coil current, the magnetic induction intensity B and themaximum value of the contact magnetic force between the pin and disk are increasednon-linearly, which shows that the B value between the pin and disk is related to themagnetization characteristics of the material. And by using the maximum magneticforce value obtained from the experiment, the average magnetic induction intensity inthe contact area can be calculated.2The magnetic induction intensity B distributing on the disk is not in uniformity.While the disk is rotating on friction and wear test, the magnetic field at each point ofthe disk changes periodically, and it will generate the phenomenon of dynamicmagnetization.3The eddy in the disk produces induction torque, and it increases frictionalresistance. The value of the torque is related to the rotational speed of the disk, B value of the contact surface, the magnetic permeability and electrical conductivity of thematerial. And the eddy also increases the temperature of the sample’s surface.4Compared with the condition of no magnetic field, under the magnetic field, thesurfaces of pin/disk friction couple adsorb a lot of debris, which impedes the directcontact of the friction surfaces, forms a three-body wear condition, and increases thewear loss.