Effect of sliding surface on O-ring
The roughness of the sliding surface is a direct factor affecting the friction and wear of the O-ring surface. Generally, the friction and wear of the smooth surface is very small, so the roughness value of the sliding surface is often very low (ra0.2-.050μm). However, tests have shown that low surface roughness (RA below 0.050 μm) can also adversely affect friction and wear. This is because of the tiny surface irregularities that maintain the necessary lubricating film. Therefore, appropriate surface requirements should be selected. The material of the sliding surfaces also has an effect on the life of the O-ring. The greater the hardness of the sliding surface material, the higher the wear resistance, the stronger the ability to maintain smoothness, and the longer the life of the O-ring. This is also an important reason for the chrome plating on the surface of the piston rod of the hydraulic cylinder. It can also be explained that the friction and wear of the sealing ring on the copper-aluminum alloy sliding surface with the same roughness is more serious than that on the steel sliding surface, and the sealing ring with low hardness and high pressure is not as durable as the steel sliding surface. sealing ring.