Experimental Determination of the Coefficient of Friction on a Screw Joint

This paper deals with the coefficient of determination screw connection friction between thread and matrix. The was measured using a laboratory device an M20 without any grease and, subsequently, plastic added (CX80 silicone, lithium, copper grease). When is added, in threads heads limited consistently retained. tightening by torque, which represents prevailing assembly method standard screwing practice, only part torque effectively used to create axial force pre-stress. rest employed suppression converted into heat. In general, depends on diverse factors such as roughness surface, gradient angle helix, properties. primary parameter experimental measurements, monitored digital spanner, generates screw. Based aforementioned parameters, objective this monitor changes matrix case different types. actual calculated through exponential equation balance. First load bolted joint use grease, where average value 0.44732; served benchmark for comparison measurements grease. showed that reduced 30.57% when lithium 40.56% silicone 47.64% copper-based making latter most suitable application. Without appropriate greasing, accompanied extremely high torques, resulted insufficient prolongation.