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.
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.