Guide rail design of seven basic requirements

1, Guidance accuracy

The guidance accuracy is the accuracy of the motion trajectory of the moving member along the guide surface. The main factors that affect the guidance precision are the geometrical accuracy of the guide bearing, the structural type of the guide rail, the contact accuracy of the guide rail, the surface roughness, the rigidity of the guide rail and the support member, the oil film thickness and the oil film rigidity of the guide rail, and the thermal deformation of the guide rail and the support member.

The geometric accuracy of the linear motion guide rail generally includes: the vertical plane and the horizontal plane of the straightness; the parallelism between the two rails surface. The geometric precision of the guide rail can be expressed by the error of the total length of the guide rail and the error of the unit length.

2, Precision maintenance

Precision maintenance is the ability to maintain the original geometric accuracy in the guide rail work process. The precision maintenance of the guide rail is mainly determined by the wear resistance of the guide rail and its dimensional stability. The wear resistance is related with the guide rail assembly material matching, the force, the processing precision, the lubrication way and the protective device's performance and other factors, in addition, the guide rail and the support part residual stress also can affect the precision maintenance of the guide rail.

3, Motion sensitivity and positioning accuracy

Motion Sensitivity is the smallest stroke that the motion member can achieve; positioning accuracy means the capability of movement member can stop as required in the specified location. Motion sensitivity and positioning accuracy are related with the guide rail type, friction characteristics, motion speed, transmission rigidity, motion component quality and other factors.

4, Motion stability

Motion stability of the guide rail is the performance of guide rail does not occur creeping phenomenon at low speed movement or trace movement. Stability is related to the guide rail structure, guide rail assembly material matching, lubrication condition, lubricants properties and the guide rail movement of the drive system stiffness and other factors.

5, Vibration resistance and stability

Vibration resistance is the ability to withstand the forced vibration and impact of the guide rail assembly, while stability refers to the performance of self-excited vibration does not occur at a given operating conditions.

6, Rigidity

Ability to resist deformation of the guide rail. Deformation will affect the relative position and orientation between the components, which is particularly important for precision machinery and instruments. The deformation of the guide rail includes guide rail body deformation and the guide rail assembly contact deformation, both should be considered.

7, Structure technology

Structure technology refers to the degree of difficulty in the process of the guide rail assembly (including all parts of the rail). In the premise of meeting the design requirements, should try to make it easy manufacturing and maintenance, and low cost.

Source: http://www.machineballscrew.com Ball Screw Linear Guide.