Evaluation of the Shape Accuracy of Turning Operations

Abstract This paper describes the changes of shape accuracy in workpiece materials depending on the turning clearance angle. The experiments started from choosing three workpiece materials, SM45C(machine structural carbon steel), STS303(stainless steel) and SCM415 (chrome-molybdenum steel). The experiments showed specifically how features of selected materials changed when they were processed with diverse machining depths, 0.1 mm, 0.2 mm and 0.3 mm, with various negative angles, 0.0˚(-6.0˚), 0.3˚(-6.3˚) and 0.9˚(-6.9˚), and called cutting edge inclinationstarting from a fixed rotational speed, 2,500 rpm, focusing on the feed rate, 0.07 mm/rev and 0.10 mm/rev. The resultsof the accuracy of processing, cylindricity, deviation from coaxiality, etc. were compared using the graph and table.The accuracy of cylindricity in the order of degree 0.0˚ → 0.3˚ → 0.9˚ depending on the workpiece materials showed the best cylindricity when it was 0.9˚. In conclusion, the accuracy improved in specific degrees irrespective of thequality of the materials when the bite negative angles increased. This means that workability improved in these experiments. In addition, the processing shape changed depending on depth of the cut and feed rate.