Three kinds of CNC machining (CNC machining) guide rails are introduced in detail

There are three main types of guide rails in CNC machining centers. According to the characteristics of surface contradictions, they can be divided into static pressure guide rails, sliding guide rails and tumbling guide rails. These three guide rails are quite different. This matter has a certain understanding.

The oil cavity is opened between the two working surfaces of the hydrostatic guide rail for CNC machining, and after entering the grease with a certain working pressure, it can produce Hydrostatic oil slicks make the working surface of the guide rail in pure liquid contradiction without causing damage and maintaining good precision; at the same time, the contradiction index is also very low, which greatly reduces the output power of the transmission device; low-speed gear has no crawling, large bearing capacity, and bending Good stiffness; in addition, the oil also has the effect of absorbing vibration and has strong anti-vibration ability. Hydrostatic guide rails can be divided into liquid static pressure guide rails and gas static pressure guide rails. The defect of the hydrostatic guide rail is that the structure is chaotic, an oil supply system is required, and the cleanliness of the oil supply is high. CNC lathes are increasingly using hydrostatic guides. The hydrostatic guide rail of CNC punch press can be divided into two types: open type and closed type.

The slide rail used in CNC machining has the advantages of simple structure, convenient processing, good bending rigidity and high anti-vibration performance. PTFE guide rail soft tape and epoxy resin wear-resistant guide rail coating are two major categories of guide rail plastics. The plastic-coated sliding guide has contradictory characteristics, good wear resistance, fitness stability, shock absorption, and craftsmanship. The disadvantage of the slide rail is that the static contradiction index is large, and the dynamic contradiction index changes with the speed change, the contradiction damage is large, and the sliding state is easy to show at low speed / (1-60 mm/min/), and later the fitness exercise is reduced. The precision grade of the components, so in addition to the economical and practical CNC lathes, other CNC lathes are not used. At present, most CNC lathes use plastic guide rails, that is, a layer of plastic film soft tape is attached to the contradictory surface of the moving guide rail, which is composed of plastic and other chemical materials.

The rolling guide used in CNC machining is to place rolling objects such as steel balls, rollers, and needles in the middle of the guide surface, so that the sliding contradiction in the middle of the guide surface is changed. For tumbling contradictions. Compared with the sliding guide rail, the advantages of the rolling guide rail are: the degree of comfort increases, and the dynamic contradiction index and the dynamic contradiction index are not much different, so the fitness movement is stable, and it is not easy to show a crawling state when the low-speed gear moves; (accuracy level High, repeating accuracy level is 02 um); small frictional resistance, easy to move, small damage, good precision retention, long life. However, the anti-vibration performance of the rolling guide rail is poor, and the safety protection performance is required to be high. Rolling guide rails have the disadvantages of small vibration reduction, easy to cause overshoot or shock, low bending stiffness, difficult to manufacture, and sensitive to track surface deviation and stains. The rolling guide is very suitable for places where the CNC lathe working parts require uniform movement, high level of movement comfort and fitness training.

The above are the three kinds of guide rails for CNC machining in detail, I hope to be helpful to you, if you want to know more about CNC machining, welcome Online consultation customer service or call the company's service hotline (upper right corner of the website) for consultation, we will be happy to provide you with quality service!