SBC 直线导轨样本

TOTAL LINEAR MOTION SOLUTION

The Precision Alliance

No.2008.4

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Under normal conditions, the linear rail system can be damaged by metal fatigue as the result of repeated stress. The repeated stress causes flaking of the raceways and steel balls. The life of the linear rail system is defined as the total travel distance that the linear rail system travels until flaking occurs.

If an excessive load or shock is applied to the linear rail system in the static or dynamic state, permanent but Iocal deformation can occur to the steel balls and raceway. E xcessive deformation disturbs the smooth of the linear rail system. The basic static load rating, Co, is the load where the steel balls or the raceway permanently deforms 1/10000 of the steel ball diameter. This amount of deformation is small and typically not noticeable. The static load rating, Co, is the maximum permissible static load.

As the static and dynamic coefficient of frictions of the SBC linear guide are so small that they minimize the required driving force and temperature increase. Frictional force depends on load, preload, velocity and lubrication. In general, the light load with high speed is more affected by the lubricant characteristic, while the medium or heavy load are more affected by the load.

Normally, both the bearing block and rail are mounted to the structure with bolts.

When a horizontal load is applied, shock, or vibration, the horizontal pressure mounting is recommended.

When the bearing and rail are installed on the table and base, the fillet radius, chamfer size, and shoulder height must be considered.

Position of Linear Rail System

L0 =1,000 mm (Distance Between Rails) L1 =200mm (Distance Between Blocks) L2 =200mm

Lubrication for linear rail system is a key part of its performance. Lubrication serves to reduce friction and

heat, therefore, choosing the correct lubrication and service intervals is critical to service life.

A comparison of oil and grease for the Linear Rail Systems is as shown in table 13. When selecting

lubrication, consider its performance, use, and purpose.

Standard grease cannot be used for special conditions like continual vibration, clean room, vacuum, high or

low temperatures. If this is the case, the appropriate lubricant should be selected.