CNC Knowledge: Who is the best, metallic rails or hard rails?

We often hear the difference between line rail and hard machining machine. Is a central machine to hard machining is.

Rail machining machine

The full name is the central machine of machining of the linear guide rail, which generally refers to rolling guide rails. The common structures include the ball guide rail and the guide rail. shift.

advantage:
1. The linear guidance rail is supported by rolling parts, and its rolling and sliding performance is stronger than the friction and sliding performance of the hard rail, without crawling;
2. Because of his small friction coefficient, he moves faster;
3. In addition, due to the small friction coefficient, wear is lower;
4. Generally, linear guidance rails are made of better materials and more precise equipment, so their precision is also higher;
5. It is practical to repair later.
Disadvantages: because its contact surface is small, its rigidity is lower than that of hard rail.

Hard rail machining machine

Generally, the guide rail and the bed are sunk into a single room, and the number of materials is generally not less than HT250, and the Binell hardness of the body is between HB180-HB240. Once the part of the guidance rail is extinguished by a high frequency or ultra audio, the hardness is generally greater than HRC50 °, which has resistance to higher wear (steel guide rails are also one hard rails). The hard rails used by CNC central machining machines are generally rectangular structures, commonly known as rectangular guidance rails.

Advantages: the sliding contact surface of the hard rail is large, which makes the machine-tool for rigidity and high stability.
Disadvantages: Due to the large contact area, friction resistance is also large, wear is faster, the speed of movement is limited and the crawling phenomenon is easy to occur. Consequently, most manufacturers of central machining machines use a plastic paste of guide rails to reduce wear and crawl the defects of hard rails.

What is the best, the wire rail or the central machining machine hard?

The wire has fast speed and high precision. Metal rails can reach a zero clearance between the tracks after preloading. Hard rails are dry friction, have a large load and strong resistance for a heavy cut. The hard rail movement must have a gap on the mobile surface before you can move. Suitable for parts with high hardness requirements and low precision.

In fact, there is no difference between hard rails and metallic rails, so I can only say if they agree. Due to their different treatment households, central machining machines in linear rail tend to process the room with small hardness and precision, while central machines for the machining of the hard rail are concentrated on the Part processing with high hardness and low precision requirements.