Many friends have this question in their minds, is the surface roughness of the workpiece and the smoothness of the surface of the workpiece the same thing? In fact, surface roughness is another name for smoothness. The surface smoothness is a kind of name according to our visual intuitive impression. The surface roughness of the workpiece is an indicator that reflects the microscopic standard of the surface of the workpiece.
Rough surface of parts is one of the common problems of 850 cnc machining center, which directly reflects the processing quality. How to control the surface roughness of parts processing, we must first analyze the reasons for the surface roughness, and then adopt corresponding improvement measures according to the reasons, so as to reduce the surface roughness of the workpiece and improve the processing quality.
During the cutting process of the workpiece in the CNC machining center, due to the thermal deformation of the metal surface during cutting and the machining vibration of the machine tool, the tool leaves a knife mark on the surface, which will cause uneven peaks and valleys on the surface of the workpiece. The geometric shape characteristics of the peaks and valleys with small spacing on the surface of the workpiece are called surface roughness. Generally speaking, the surface roughness formed by different processing methods is also different.
The main reasons for the surface roughness of the workpiece are: tool marks caused by the milling process; thermal or plastic deformation caused by cutting separation; friction between the tool and the machined surface;
What effect will the rough surface have on the workpiece?
The surface roughness affects the wear resistance of the workpiece. The higher the surface roughness, the smaller the effective contact area between the matching surfaces, the greater the pressure, the faster the workpiece wears, and the shorter the service life.
The surface roughness affects the fatigue strength of the parts. Larger wave troughs exist on the rougher workpiece surface. Very sensitive to stress concentration, which affects the fatigue strength of parts.
Affect the measurement accuracy of the workpiece. The surface roughness of the measured surface of the part and the measuring surface of the measuring tool will directly affect the accuracy of the measurement, especially during precision measurement.
When selecting the surface roughness of the workpiece, it should not only meet the requirements of the surface function of the part, but also consider the economic rationality. On the premise of satisfying the cutting function, a larger surface roughness reference value should be selected as far as possible to reduce production costs. As the executor of the cutting machining center, the tool should pay attention to the daily maintenance and timely grinding to avoid the unqualified surface roughness caused by the blunt tool.
