Nowadays, the turning tolerances are small, the surface roughness of the workpiece surface R_a3.2 and below, the high-speed steel wide-blade knives are rarely used, and it is increasingly dependent on direct turning with carbide turning tools. When turning small and medium-sized parts, because the rotation speed is impossible to reach high or the new grinding tool is sharp, the surface of the machined workpiece is not bright, and even the scaled channel is generated.
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