Five principles of linear guide design
Principle 1: Accuracy does not interfere with each other: The accuracy of linear guides will not affect each other during manufacturing and use, and higher accuracy coefficients can be obtained.
Principle 2: The principle of automatic fitting of linear guide pairs: To make the guide rails more accurate, the guide pairs must have the characteristics of automatic fitting. The horizontal guide rails can be fitted by the weight of the moving components; the rest of the guide rails need additional spring force or roller pressure to fit them together.
Principle 3. The principle of closeness between dynamic and static friction factors: When designing linear guide pairs, the dynamic and static friction coefficients of the contact surfaces of the guide rails should be as close as possible to obtain higher repeat positioning accuracy and low-speed stability. Rolling guides and inlaid plastic plates Or ordinary sliding guide rails with plastic sheets, the friction coefficient is smaller and the static and dynamic friction coefficients are more likely to approach a certain value.
Principle 4: Compensating force deformation and thermal deformation principle: linear guide rail and its support will cause deformation when subjected to force or temperature change. Therefore, when designing guide rail and its support, it is required to form a corresponding shape after deformation. For example, the beam guide of the gantry type machine tool is made into a convex shape to compensate for the bending deformation caused by the weight of the headstock.
Principle 5. The principle of full contact: To fix the length of the linear guide, it is necessary to ensure that the moving guide is at the two extreme positions of the maximum stroke and make full-length contact with the fixed guide to ensure that the linear guide pair can complete full contact during the contact process. Make it perfect.