How to choose the guide rail for CNC machine tools such as gantry milling machine, CNC lathe, machining center?
First of all, we must understand the advantages and disadvantages of the rail and hard rail:
1. The advantages and disadvantages of hard track and should
The hard rail sliding contact surface is large, the rigidity is good, the earthquake resistance is strong, and the bearing capacity is strong, which is suitable for heavy load cutting.
The hard rail is dry friction, and the frictional resistance is also large due to the large contact surface, and the moving speed cannot be too fast. At the same time, creeping is easy to occur, and there is a gap in the moving surface, which may cause processing errors. The maintenance of the machine track is a top priority. Once the track is not fully lubricated, it will cause the track to burn or wear, which is fatal to the accuracy of the machine.
The application of hard rail is suitable for heavy cutting, large molds, high hardness workpieces, and workpieces with high precision requirements.
2. Advantages and disadvantages of line rail and its application
Nowadays, many machine tools run extremely fast, especially the free-wheel speed. This is largely due to the merit of the line rail; the line rail can be pre-tightened to achieve zero clearance between the rails with high precision; in terms of service life, the line The track is much higher than the hard track.
The line bearing the cutting force is smaller than the hard track, but for the hard track, in fact, many machine tool line rails have greatly improved the carrying capacity.
The application of the line rail is suitable for high-speed machines, high-speed cutting, suitable for processing products, small precision molds. More precision machining centers today use wire rails.
It can be seen that the selection of CNC machine tool guides such as portal milling machine, CNC lathe, machining center, etc. mainly depends on the output of the workpiece and the machining accuracy. High precision, mass production of small-sized workpieces mainly consider line rail guides; large size, precision requirements (0.01mm or more), high hardness, large-size workpieces generally use hard rail guides.