In the sliding guide rail, most of the energy is consumed in the form of wear energy, so the wear is fast and it is difficult to maintain high accuracy for a long time. On the contrary, the rolling guide pairs have less friction and wear, and can maintain high accuracy for a long time.
In addition, because the rolling guide pairs are supported by multiple rolling bodies, and the raceway can easily obtain high machining accuracy and high surface hardness, the linear guide pairs have a long working life.
For the fluid lubrication of the sliding guide surface, due to the floating of the oil film, the movement accuracy error is unavoidable. In most cases, fluid lubrication is limited to the boundary area, and direct friction caused by metal contact is unavoidable. In this friction, a large amount of energy is wasted as friction loss.
On the contrary, rolling contact can keep the rolling linear guide system in a high precision state for a long time due to less friction energy consumption and corresponding reduction of friction loss of rolling surface. At the same time, the use of lubricating oil is also very small, which makes it very easy to design and maintain the lubricating system of the machine tool.
