（1） Factors affecting surface roughness in machining
1. Dongguan CNC processing factory considers that the re mapping of tool geometry: when the tool moves with respect to the workpiece, the residual area of cutting layer is left on the machining surface, and the shape of the tool geometry is reflected. The height of residual area can be reduced by reducing feed, main deflection angle, secondary deflection angle and increasing radius of the arc of the tip. In addition, it is also an effective measure to reduce the surface roughness value by increasing the front angle of the tool to reduce the plastic deformation degree, selecting the lubricant reasonably and improving the grinding quality of the cutting edge to reduce the plastic deformation and the formation of the knife tumor and scale thorns<< Dongguan CNC processing factory deserves attention > >
2. the properties of workpiece materials in Dongguan CNC processing factory: when processing plastic materials, the metal extrusion by the tool produces plastic deformation. In addition, the tearing effect of cutting tool forcing chip and workpiece separation makes the surface roughness value increase. The better the toughness of the workpiece material, the greater the plastic deformation of the metal, the rougher the machined surface. When processing brittle materials, the chip is granular, and many pitting points are left on the surface of the processing due to the chip breakage, which makes the surface rough.
3. cutting amount
（2） The factors that influence surface roughness in grinding: just as the formation process of surface roughness in machining, the formation of surface roughness is determined by geometric factors and plastic deformation of surface metal. The main factors affecting the surface roughness are: the size of grinding wheel, the hardness of grinding wheel, the dressing of grinding wheel, grinding speed, radial feed and number of grinding, the feed speed and axial feed of workpiece circumference, and the cooling lubricant<< Dongguan CNC processing factory deserves attention > >