The surface roughness of Slewing Ring Bearing is the judgment index of bearing surface accuracy. Bearing surface roughness refers to the unevenness of the machined surface with small clearances. The interval between two peaks or valleys is so small that it is difficult to distinguish them with the naked eye. Small geometric errors, usually the smaller the bearing surface roughness, the smoother the surface, and the better the bearing performance. The following briefly describes the effect of the roughness of the Slewing Ring Bearing surface on the bearing. There are also ways to improve bearing surface finish.
1. The effect of roughness on bearings
1). Wear resistance: The roughness of the Slewing Ring Bearing surface will affect the wear resistance of the part. The rougher the surface, the easier the bearing wear during operation, the smaller the contact area, the greater the pressure, and the faster the wear rate.
2). Stability: The rougher the bearing surface, the greater the influence on the bearing matching effect. Generally speaking, as the surface is rougher, wear occurs, and the bearing clearance gradually increases. The rougher the surface, the less interference fit during assembly, and the worse the stability of bearing operation.
3). Corrosion resistance: The bearing surface is rough, and it is easy to contact with corrosive gas or liquid. Corrosion remains on the bearing surface, penetrates into the inner metal layer, and corrodes the bearing surface.
4). Fatigue strength: The rough bearing surface has sharp seams and cracks, which are sensitive to stress concentration and affect the fatigue strength and service life of the bearing.
5). Sealing: The rough bearing surface cannot be closely meshed with the equipment. When gas or liquid passes through the gap between the contact surfaces, the bearing can affect the bearing sealing effect, resulting in contamination or leakage of lubricant, thus affecting bearing life. In addition, the roughness of the bearing surface also affects the shape and measurement accuracy of the bearing.
2. Improvement of bearing surface finishing method
1). Reduce the height of the remaining area: reduce the main declination angle, auxiliary declination angle and feed amount, increase the radius of the tool nose arc, and reduce the height of the remaining area. In general, reducing auxiliary declination works well. Increase the tip's arc radius appropriately, but not too large. If it is too large, the radial resistance will increase and the bearing will vibrate. You can increase the cutting speed to reduce the feed rate, or reduce the remaining area height.
2). Avoid the occurrence of debris types and thorns. The cutting speed can be changed to suppress the generation of chip species and keep the cutting edge sharp.
3). Avoid the wear of bright spots: The wear of bright spots or bright spots, plus the noise of the notch, indicates that the tool is severely worn. To sharpen or sharpen the knife in time to ensure the smoothness of the cutting surface.
4). Use the correct wire cutter. Wire cutters with a positive edge slope should be used to allow chips to flow to the surface the workpiece will be machined, and appropriate chip measures should be taken.
5). Anti-vibration: adjust the spindle clearance and bearing accuracy, select reasonable tool geometric parameters, and increase the installation strength and cutting amount of the workpiece.
6). Select the appropriate cutting fluid: The use of cutting fluid has certain improvements in removing debris tumors, removing scale thorns, reducing surface roughness, reducing cutting temperature, and reducing tool wear. The above is the explanation of the influence of the surface roughness of Slewing Ring Bearing on the bearing. I hope that the introduction of how to improve the bearing surface finish can also be helpful to you. In addition, we can meet various precision requirements such as bearing production rotary support, rotary drive, spur gear drive, etc. If necessary, welcome to inquire.