xiehe model

The so-called CNC machining is also called CNC machining. It refers to a type of processing in which the programmer uses a computer to program the work order that needs to be processed and then is operated by the CNC machining operator. This is called CNC numerical control machining. There are three main types of guide rails for CNC machining centers. The differences between these three types of guide rails are relatively large. Therefore, if you need to choose the guide rails for a CNC machining center, it is best to have a detailed understanding of these three types of guide rails in advance, so that you can better prepare yourself. The CNC machining center has selected guide rails, but many people do not understand the differences between the three guide rails of the CNC machining center. Therefore, the manufacturer of Xiehe Processing Factory will briefly introduce the differences between the three types of 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, tumbling guide rail and static pressure guide rail. 3 types of guide rails.

1.Sliding guide rail

Sliding guide rails have the advantages of simple structure, convenient manufacturing, good rigidity and high vibration resistance. The traditional cast iron-cast iron, cast iron-quenched steel guide rail has the disadvantage that the static conflict coefficient is large, and the dynamic conflict coefficient changes with the speed, the conflict loss is large, and the crawling phenomenon is easy to occur at low speed/(1-60mm/min/) , and then reduces the positioning accuracy of moving parts, so it is no longer used in other CNC machine tools except economical CNC machine tools.

At present, most CNC machine tools use plastic-coated guide rails, that is, a layer of plastic film soft tape composed of plastic and other chemical materials is affixed to the conflict surface of the moving guide rails.

Two types of guide rail plastics are commonly used: polytetrafluoroethylene guide rail soft tape and epoxy wear-resistant guide rail coating. The characteristics of plastic-coated sliding guides are good friction characteristics, good wear resistance, smooth movement, good vibration damping and good craftsmanship. cnc processing factory

2.Rolling guide rail

Rolling guide rails place rolling bodies such as balls, rollers, and needle rollers between the guide rail surfaces, so that the sliding conflict between the guide rail surfaces becomes a rolling conflict. Compared with sliding guides, the advantages of tumbling guide rails are: high sensitivity, and the coefficient of dynamic conflict and static conflict is very small, so the movement is smooth, and it is not easy to crawl when moving at low speed; (high positioning accuracy, repeated positioning accuracy can reach 02um ; Small friction resistance, light movement, small wear, good accuracy and long life. However, the vibration resistance of the rolling guide rail is poor and the protection requirements are high.

Rolling guide rails are particularly suitable for situations where the working parts of machine tools require uniform movement, sensitive movement and high positioning accuracy. This is the reason why tumble guides are widely used in CNC machine tools.

3. Static pressure guide rail

There is an oil chamber between the two guide rail working surfaces of the hydrostatic guide rail. After lubricating oil with a certain pressure is introduced, a static pressure oil film can be formed, so that the guide rail working surface is in pure liquid conflict, without wear and tear, and has good accuracy and maintainability; At the same time, the friction coefficient is also extremely low, which greatly reduces the driving power; there is no crawling at low speeds, large load-bearing capacity, and good stiffness; in addition, the oil has a vibration-absorbing effect and good vibration resistance. Static pressure guide rails can be divided into liquid static pressure guide rails and gas static pressure guide rails.

Its disadvantage is that it has a complex structure, requires an oil supply system, and requires high oil cleanliness. Hydrostatic guides are increasingly used in machine tools. The hydrostatic guide rails of CNC turret punch presses can be divided into two categories: open type and closed type.

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