旋削加工における加工精度の解析

抄録

The geometrical error of the workpiece in turning operation is analysed experimentally in this paper. The experiment reveals that nearly a half of the error is due to thermal expansion of the tool tip and the holder and that the rest comes from the thermal expansion of the workpiece, the deflection of the workpiece and the tool post, the geometrical error of the machine tool and the tool wear. Each error component can be obtained quantitatively by the measurements of displacement of the tool, workpiece and tool post during cutting. Cutting experiments show that the thermal expansion of the tool and the deflection of the workpiece become large with the increase of the depth of cut and feed, while they decrease with the increase of cutting speed. Use of cutting fluid restrains thermal expansion of the tool and workpiece, leading to higher accuracy of the workpiece.