CNC machine tool spindle bearing selection principles and guidelines

There are many types of bearings, and there are countless bearings that can be used for machine tool spindles. However, for CNC machine tools, the selection of spindle bearings is not like that of ordinary machine tools. The various requirements are more stringent. Different CNC machine tool spindle bearing selections Different priorities that need to be considered when selecting CNC machine tool spindle bearings often lead to very different bearing types. The following spindle bearing manufacturers have compiled the CNC machine tool spindle bearing selection principles and guidelines for your reference.

CNC machine tool spindle bearing selection principles

The selection principle of CNC machine tool spindle bearings is to use different types of bearings according to the different requirements of the spindle assembly such as rotation speed, load-bearing capacity and rotation accuracy:

1. Generally, the spindle components of small and medium-sized CNC machine tools (lathes, milling machines, machining centers, grinders) mostly use rolling bearings;

2. Heavy-duty CNC machine tools use hydrostatic bearings;

3. High-precision CNC machine tools (such as coordinate grinders) use gas static pressure bearings;

4. The spindle with a speed of (2-10)x104r/min can use magnetic bearings or ceramic rolling bearings.

In actual use, reasonable selection should be made based on comprehensive consideration of the working performance requirements, manufacturing conditions and economic effects of the spindle assembly.

CNC machine tool spindle bearing selection guide

The CNC machine tool spindle must have both radial bearings to bear radial loads and thrust bearings to bear axial loads in both directions. The selection of bearing types and models should be reasonably selected based on requirements such as stiffness, load-bearing capacity, rotation speed, vibration resistance and structure. Normally, selection can be made according to the following conditions:

1. Amplitude speed and heavy load: double row cylindrical roller bearings are equipped with bidirectional thrust angular contact ball bearings (if equipped with thrust bearings, the limit speed is low); paired tapered roller bearings have a simple structure.

But the limit speed is low; the limit speed of hollow tapered roller bearings can be increased, but the cost is higher.

2. High speed and light load: contact ball bearings in groups, with a contact angle of 25″ or 15° depending on the size of the axial load.

3. The main axial load is: when the accuracy is not high, choose a thrust bearing with a deep groove ball bearing; when the accuracy is high, choose a radial thrust bearing.

The above are the CNC machine tool spindle bearing selection principles and guidelines compiled by the spindle bearing manufacturer for everyone. I hope it will be helpful to everyone.