1. Factors affecting the surface roughness machined by large CNC lathes I: geometric factors
From the geometric point of view of surface roughness, the shape and geometric angle of the tool, especially the arc radius of the tool tip, the main deflection angle, the auxiliary deflection angle and the feed rate in the cutting parameters have a great impact on the surface roughness.
2. The second factor affecting the surface roughness of large-scale CNC lathe: physical factors
Considering the physical essence of the machining process of large-scale CNC lathe, the round corner of the cutting edge and the extrusion and friction behind the tool cause plastic deformation of metal materials, which seriously worsens the surface roughness. When plastic materials are processed by large CNC lathes to form banded chips, it is easy to form chip nodules with high hardness on the rake face. It can replace the rake face and cutting edge for cutting, so that the geometric angle and back feed of the tool change. The outline of the chip buildup is very irregular, so that the depth and width of the knife marks on the surface of the workpiece are constantly changing. Some chip nodules are embedded in the workpiece surface, which increases the surface roughness. Vibration occurs during cutting, which increases the parameter value of workpiece surface roughness.
3. Factors affecting the surface roughness of large-scale CNC lathe processing three: processing technology factors
From the perspective of large-scale NC lathe processing technology, its influence on the surface roughness of machined workpiece mainly includes factors related to cutting tools, workpiece materials and NC processing conditions.
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