What’s the Influence for Surface of CNC Machined Components
Along with CNC machined components included metal & plastic materials are widely used in Automotive, Aerospace& Medical industries. More and more consumers and the end of user have a certain requirements on the part’s performance and aesthetics. So as one professional CNC machining manufacturer, we’re always asked our customer before quotation: “what’s the functions and application of the parts, whether you have any special requirements for the parts” etc. then we will provide the best suggestion and quotation to our customer before more discusssion these issues.
Because we know very well that what does a perfect product mean? It not only means that the part looks perfectly, but also means that it will be good used in the final production and assembly. On the contrary, what effect does surface roughness have on the performance of the CNC machined components?
Below are influences for surface roughness of cnc machined components
Impact matching property
For the parts with the clearance matching, the surface roughness is easy to form wear, so that the gap will increase quickly and even destroy the matching property. Especially in the case of small size and high accuracy, the surface roughness has more influences on the coordination properly.
Impact the part strength
The rougher polish the surface, the more sensitive to the stress concentration, especially under the effect of alternating load, which effect is greater. Such as: the crankshaft of an engine tends to be damaged for this reason, so it should be strict requirements for the surface roughness of the grooves or rounded corners of the crankshaft.
Impact the part wear resistance
When two parts touch and produce relative motion, the friction between the working surfaces can increases energy dissipation because of the need to overcome the resistance between the undulating surface peaks and valleys. Rougher of the surface, the greater of friction coefficient, and the greater of energy consumed by friction. In addition, the rougher the surface, the smaller the actual effective touch area between the surface, the larger the unit pressure, therefore the more easily worn.
Therefore, reducing the roughness of the parts surface can reduce the friction coefficient, and also can improve the transmission efficiency and reduce the friction loss and increase the output work of the power machine. In addition, it also can reduce wear on the surface of the parts, and prolong the service life of the machine. However, the surface is too bright and clean, it will be detrimental to the storage of the lubricating oil, so it’s easy to create a semi-dry friction or even dry friction between the working face, thus to increase the friction coefficient and aggravate the wear.
At the same time, due to the smooth surface of the coordination surface, and also increase the adsorption force between the parts contacting the surface, which also increases the final friction coefficients and accelerates the wear.
Impact the part corrosion resistance
The rougher the surface, the more corrosive gas or liquid that accumulates on the surface of the parts, and penetrates the surface layer through the surface of the microscopic concave valley to make the corrosion worse.
Impact the part fatigue strength
Micro geometry error contour valley which was the cause of stress concentration. The parts more rough, the stress concentration is more sensitive, especially when the parts under cyclic loading, due to the influence of stress concentration, reduce the parts fatigue strength to cause the damage of surface cracks on wire parts.
Impact the accuracy of the machine and instrument
Due to the surface roughness, large friction coefficient and large wear, so not only reduce the sensitivity of machine and instrument parts movement, but also affect the maintenance of machine or instrument precision.
At the same time, basing on the rough surface of the real affective contact area is small, under the same load, the unit area pressure of the contact surface increase, which increase the deformation of the surface layer. Namely the surface contact rigidity becomes worse, which affects the working precision of the machine. Therefore, the smaller the surface roughness, the higher the accuracy of the machine or instrument.
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