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Unformatted text preview: Surface Finish 83 Valery Marinov, Manufacturing Technology Introduction The machining processes generate a wide variety of surface textures. Surface texture consists of the repetitive and/or random deviations from the ideal smooth surface. These deviations are v roughness : small, Fnely spaced surface irregularities (micro irregularities) v waviness : surface irregularities of grater spacing (macro irregularities) v lay : predominant direction of surface texture 5.7 SURACE INISH Roughness control actors, inuencing surface roughness in machining are v tool geometry (major cutting edge angle and tool corner radius), v cutting conditions (cutting velocity and feed), and v work material properties (hardness). Waviness spacing Lay direction Waviness heigth Roughness height Roughness width Elements of the machined surface texture Three main factors make the surface roughness the most important of these parameters: Fatigue life : the service life of a component under cyclic stress (fatigue life) is much shorter if the surface roughness is high Bearing properties : a perfectly smooth surface is not a good bearing because it cannot...
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This note was uploaded on 12/11/2010 for the course MECH 364 at Cornell University (Engineering School).