The life of linear guide rail is very dispersive, even if the products manufactured in the same batch are used in the same motion state, the life will be different; This is mostly due to the inherent changes in the fatigue characteristics of the material itself. Therefore, in order to define the life of linear guide rail, the rated life is generally taken as the benchmark; Its definition is: the total running distance that a batch of the same products can run under the same conditions and rated load one by one, and 90% of them have no surface peeling phenomenon. The main factors affecting the service life of linear guide rail are hardness, temperature and load.
1. Hardness coefficient
The hardness of the bead contact surface of the linear guide rail is required to be HRC58-62 at a certain hardening depth. If the hardness value cannot reach the required level, the rated load and service life of the linear guide rail will be reduced. At this time, the dynamic and static rated loads are the values listed in the dimension table and multiplied by the corresponding hardness coefficient.
2. Temperature coefficient
The system temperature will affect the material of the linear guide rail. When the temperature is higher than 100°C, the rated load and service life of the linear guide rail will be reduced. At this time, the dynamic and static rated load is the value listed in the dimension table and multiplied by the corresponding temperature coefficient. Because some fittings are made of plastic materials, they are not resistant to high temperature, so it is suggested that the temperature should be lower than 100 °C.
3. Load factor
The loads acting on the linear guide rail include the dead weight of the device itself, the inertia load when starting and stopping, and the moment load caused by suspension, as well as the vibration and impact load accompanied by movement. This type of load is not easy to calculate. According to the experience, it is suggested that the calculated load value be multiplied by the corresponding load factor according to the load condition and service speed.
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