Basic requirements for design of linear guide rail

1 guidance accuracy

The guiding accuracy is the degree of accuracy of the movement locus of the moving member along the guide rail. The main factors affecting precision guide rail bearing surface geometric accuracy, structure type, guide rail contact accuracy, surface roughness, guide and support stiffness, guide the oil film thickness and oil film stiffness, and guide and support the thermal deformation etc..

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

2 accuracy retention

Accuracy is the ability to maintain the original geometric accuracy in the working process of the rail. The accuracy of the guideway is mainly dependent on the wear resistance of the guide rail and the dimensional stability. The wear resistance and guide material matching, stress, machining accuracy, lubrication and protection device performance factors, in addition, guide and support the residual stress in the rail will also affect the precision retentivity.

3 motion sensitivity and positioning accuracy

The sensitivity of motion is the minimum distance that can be realized by the moving component, and the positioning accuracy is the ability of the moving component to stop in the specified position as required. The sensitivity and accuracy of the motion are related to the type of rail, the friction characteristics, the movement speed, the transmission stiffness and the quality of the moving member.

4 motion stability

The stability of the guide rail is the performance of the guide rail in the low speed movement or micro movement. The stability is related to the structure of the guide rail, the matching of the material of the guide rail, the lubrication condition, the property of the lubricant and the rigidity of the transmission system.

5 vibration resistance and stability

The vibration resistance is the ability to bear the forced vibration and impact, and the stability is not the performance of the self-excited vibration under the given operating conditions.

6 stiffness

The ability of rail to resist deformation. The deformation will affect the relative position and orientation precision of the components, which is very important to the precision machinery and instrument. The deformation of the guide rail includes the contact deformation of the guide rail.

7 Structural manufacturability

Structural technology refers to the guide rail (including the components of the guide rail) processing difficulty. In order to meet the design requirements of the premise, should try to make the manufacture and maintenance convenient, low cost.