Experimental and theoretical analysis of wear mechanism of metals in tilted block on plate type sliding

摘要

In this investigation, the wear mechanism of metals in tilted block on plate type sliding was analyzedexperimentally and theoretically. Block specimens were made of 0.45% carbon steel and tip angle ofblock edge wasπ/2 rad (90°). Plate specimens were made of 0.45% carbon steels with threedifferent hardness and aluminium alloys with two different hardness. Attack angle of block edge CLwas changed from 0.025π rad (4.5°) to 0.48π rad (85.5°). All of the wear tests were carriedout under mineral oil lubricated condition. Wear process was observed successively by using aCharge-Coupled Device (CCD) microscope and recorded with a Video Tape Recorder. Thefollowing results were obtained. Wear mechanisms of metals were classified into following threetypes: 'cutting', 'ploughing' and 'plastic deformation of block tip'. Specific wear rate of platespecimens changed drastically by the change of wear mode. A new wear map for tilted block on platetype sliding was proposed theoretically by using the attack angle CL and hardness ratio r=H{sub}(plate)/H{sub}(block), where H{sub}(block) is Vickers hardness of block specimen andH{sub}(plate) is Vickers hardness of plate specimen. This wear map correlates well with theexperimental results. The newly introduced wear map indicates that the severest wear mode of'cutting' can be suppressed if the hardness ratio is higher than a certain critical value which can bechanged by lubricated condition or attack angle.