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Classification of bearing linear guide rail

wallpapers News 2021-06-10
There are many types of bearing linear guideways, which can be divided into sliding guideways and rolling guideways according to the friction properties of the joint surface.
Sliding guide rail: moving parts and direct contact with the working surface of the guide parts, the working surface of the guide rail in the instrument has only a small amount of lubrication, the thickness of the oil is very small, in the boundary of the United States. The relative speed of the guide rail is not high. When the working load is large, the friction increases and the wear accelerates. But the structure is simple and the contact stiffness is high. The static friction force is related to the static friction force, and the dynamic friction force is related to the speed. Virtual attention to prevent the effect of the feed and temperature changes on the gap change. After grinding, scraping and other finishing, it can achieve high guiding accuracy.
Rolling guide rail: there is a rolling body between the working surface of the moving parts and the guide parts (rolling, glass column, winding needle, or rolling bearing). The rolling body rolls in the theory of the working face of the guide rail without sliding, forming rolling friction, friction resistance is small and has nothing to do with the speed of motion. The contact area between the rolling body and the working surface of the guide rail is small, and it is sensitive to the geometric shape error, which directly reflects the real accuracy of the guide rail surface. Therefore, the processing precision of the guide rail surface is high, the structure is more complex, and the size is increased. Only when the preloading is too large and the manufacturing quality is too low, the phenomenon of violation occurs. The motion sensitivity is high and it can adapt to different speeds.
Hydrostatic guide: one of the working surfaces of the guide is provided with an appropriate oil chamber, and the lubricating oil of a certain pressure enters the oil chamber through the throttle so that the moving parts float slightly. The oil film separates the moving scale from the guide parts. The pressure of the oil chamber can be automatically adjusted, and the thickness of the oil film is almost unchanged. Due to the realization of liquid lubrication, friction resistance is very small. The friction coefficient has a linear relationship with velocity. Small work consumption, high efficiency, smooth movement, no crawling phenomenon. Because the metalworking surface is not directly in contact, almost no wear and tear, long service life. Good resistance and carrying capacity. Good stiffness. High guiding accuracy, can eliminate local geometric errors. But the complex structure, need a set of the oil supply systems, occupied a large space, the oil film thickness is not easy to grasp, adjustment is difficult, and not easy to be stable.
Elastic guide rail: the moving parts of the guide rail are supported by two spring plates of equal stiffness, and the spring plates are fixed on the bracket. After the moving parts are stressed, they make linear displacement along their own axes. When the displacement is very small, it can be considered that the axis position of the moving piece remains unchanged. The displacement of moving parts depends on the elastic deformation of the spring. If the displacement is large, the moving part will deviate from the original axis position in parallel, resulting in a large steering error, so it is only suitable for the guide rail with small displacement.

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