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Detailed introduction of three kinds of CNC machining rails

There are three main guide rails for CNC machining centers. According to the contradictory characteristics of the surface, they can be divided into hydrostatic guide rails, sliding guide rails, and rolling guide rails. The difference between these three guide rails is relatively large. Everyone must be concerned about this when developing cnc machining price. A certain understanding.

An oil cavity is opened between the working surfaces of the two guide rails of the hydrostatic guideway used in CNC machining. After entering the grease with a certain working pressure, static pressure floating oil can be generated, so that the working surface of the guideway is in a pure liquid contradiction without causing It is damaged and the precision is maintained. At the same time, the contradiction index is also very low, which greatly reduces the output power of the driver. There is no creep in the low speed gear, the load can be large, and the bending stiffness is good. In addition, the oil has the practical effect of absorbing vibration. Good vibration resistance. Hydrostatic guide rails can be divided into hydrostatic guide rails and vapor hydrostatic guide rails. The defect of the static pressure guide rail is that the structure is disorderly, and the oil management system must be provided, and the cleanliness of the oil must be high. Hydrostatic guide rails are increasingly used in CNC lathes. CNC machine tools, CNC punch presses, high-speed punch presses, hydrostatic guides can be divided into two types: open type and closed type.

The sliding guide used in CNC machining has the advantages of simple structure, convenient manufacturing, good bending rigidity, and advanced vibration resistance. There are two types of guide rail plastics: PTFE guide rail soft belt and epoxy resin wear-resistant guide rail coating. The characteristics of plastic sliding guide rails are good contradictory characteristics, good wear resistance, stable fitness exercise, good shock absorption, and good process performance. The defect of the sliding guide is that the static contradiction index is large, and the dynamic contradiction index changes with the speed change, the contradiction damage is large, and it is easy to show the crawling condition at low speed/(1-60mm/min/), and then reduce the accuracy of fitness sports components Therefore, it is no longer used on other CNC lathes except for economical and practical CNC lathes. At this stage, most CNC lathes use plastic guide rails, that is, a layer of plastic film soft tape made of plastic and other chemical materials is pasted on the contradictory surface of the moving guide rail.

The rolling guide used in low price cnc machining is to place steel balls, rollers, needles and other rolling bodies in the middle of the guide surface, so that the sliding contradiction in the middle of the guide surface becomes a rolling contradiction. Compared with the sliding guide rail, the advantages of the rolling guide rail are: the longitude of comfort is improved, and the difference between the dynamic contradiction and the static contradiction index is very small, so the fitness exercise is stable, and it is not easy to show the crawling condition when moving at low speeds; (high precision level, repeated precision level Reach 02um; contradictory friction resistance is small, easy to move, small damage, good precision maintenance, long life. But the vibration resistance of the tumbling guide is weak, and the safety protection regulations are higher. The defect of the tumbling guide is that the vibration damping is small and very It is easy to cause overshoot or shock, low bending stiffness, difficult production, and more sensitive to dirt and track deviation. Rolling guide rail is very suitable for CNC lathe cnc machining components to move well-proportioned, fitness exercises and high-precision places.

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