xiehe model

The so-called CNC machining is also called numerical control machining, which refers to a kind of machining that the programmer uses to program the work order that needs to be processed and then operated by the CNC machining operator.

There are mainly three kinds of guide rails in CNC machining centers, and the differences between these three guide rails are relatively large, so if you need to choose the guide rails of CNC machining centers, it is best to have a detailed understanding of these three guide rails in advance, so that you can better serve yourself The CNC machining center has selected guide rails, but many people do not understand the difference between the three guide rails of the CNC machining center. Therefore, next, the CNC processing factory manufacturer will briefly introduce the differences between the three guide rails.

According to the motion track, the guide rail can be divided into linear motion guide rail and circular motion guide rail; according to the working nature, it can be divided into main motion guide rail, feed motion guide rail and adjustment guide rail; according to the conflict nature of the contact surface, it can be divided into sliding guide rail, rolling guide rail and static pressure guide rail. There are 3 types of rails.

1. Slide rail

The sliding guide rail has the advantages of simple structure, convenient manufacture, good rigidity and high vibration resistance. The traditional cast iron-cast iron, cast iron-hardened steel guide rails have the disadvantages of large static friction coefficient, dynamic friction coefficient changes with speed, large friction loss, and creeping phenomenon at low speed/(1-60mm/min/) , Then the positioning accuracy of the moving parts is reduced, so it is not used in other CNC machine tools except for economical CNC machine tools.

At present, most CNC machine tools use plastic-coated guide rails, that is, a layer of plastic film soft belt composed of plastic and other chemical materials is pasted on the friction surface of the moving guide rail.

There are two types of guide rail plastics: PTFE guide rail soft tape and epoxy wear-resistant guide rail coating. The plastic-coated sliding guide rail is characterized by good friction characteristics, good wear resistance, smooth movement, good vibration damping, and good craftsmanship.

2. Tumbling guide rail

The rolling guide rail is to place rolling elements such as balls, rollers, and needles between the guide rail surfaces, so that the sliding conflict between the guide rail surfaces becomes a rolling conflict. Compared with sliding guide rails, rolling guide rails have the following advantages: high sensitivity, and the difference between dynamic and static friction coefficients is very small, so the movement is stable, and it is not easy to crawl when moving at low speed; (high positioning accuracy, repeat positioning accuracy can reach 02um ;Small friction resistance, light movement, small wear, good precision retention, and long life. However, the vibration resistance of the rolling guide is poor, and the protection requirements are high.

The rolling guide rail is especially suitable for the occasions where the working parts of the machine tool require uniform movement, sensitive movement and high positioning accuracy. This is the reason why rolling guideways are widely used on CNC machine tools.

3. Static pressure rail

There is an oil chamber between the working surfaces of the two guide rails of the hydrostatic guide rail. After passing in lubricating oil with a certain pressure, a hydrostatic oil film can be formed, so that the working surface of the guide rail is in pure liquid friction, no wear, and good accuracy retention; At the same time, the friction coefficient is also extremely low, which greatly reduces the driving power; there is no crawling at low speed, the bearing capacity is large, and the rigidity is good; in addition, the oil has a vibration-absorbing effect and good vibration resistance. Hydrostatic guide rails can be divided into liquid static pressure guide rails and gas static pressure guide rails.

Its disadvantage is that the structure is complex, there must be an oil supply system, and the cleanliness of the oil is required to be high. Hydrostatic guide rails are increasingly widely used in machine tools. CNC turret punch press hydrostatic guide rails can be divided into two categories: open type and closed type.

The above content is the difference between the three kinds of guide rails summarized by the cnc processing factory manufacturer, and I hope it can be helpful to everyone. If you want to know more about the CNC processing factory, please call the CNC processing factory manufacturer, we will serve you wholeheartedly.