High Quality Gear Bearing Made In China

1.How to correctly judge and deal with the peeling of the slewing bearing raceway and the broken teeth of the gear bearing?

Due to the manufacturing quality problems such as material pores or uneven hardness and depth of the hardened layer of the interlayer raceway, or some external reasons, the hardened layer of the raceway is peeled off or the teeth of the ring gear bearing are broken during the use of the slewing bearing, so that the equipment cannot work normally.

For raceway peeling, first make a correct judgment. There is peeling, which is generally not easy to see on the outside. According to our experience, the following conditions indicate that the raceway has peeling layers: when the main engine rotates under load, there is an abnormal “clack-clack” sound at the raceway.

the rotation speed is uneven or the speed of a certain azimuth is obviously slowed down and accompanied by There is slight vibration; the temperature rise of the rotary motor is too high or the current is too large; the keyway of the rotary motor and the hydraulic coupling or coupling is crushed, etc.

After peeling occurs, it must be repaired in time. Otherwise, the peeling area will expand, so that the entire gear bearing will be scrapped.

The repair method is: first take out the roller or steel ball in the gear bearing to separate the inner and outer rings; then clean the raceway with gasoline; The hardened layer of the cracks that have been generated around is ground off, and the bottom of the peeling layer is ground flat;

the raceway needs to be repaired and welded with a welding torch to preheat, and use a medium carbon steel electrode for welding (the electrode must be dried before use, and followed by The welding layer should be slightly higher than the surface of the raceway by 1-2mm;

if the peeling layer is deep or the area is large, the welding should be applied in layers and sections, and the temperature of the base metal should not be too high to cause deformation;

this avoids Rapid cooling produces welding cracks, and heat preservation measures should be taken immediately after welding to gradually cool him. After cooling, use a grinder to smooth the repair welding layer to make it slightly higher than the surface of the raceway.

Gradually grind the repair welding layer with whetstone or metallographic emery cloth to make it the same height as the normal surface of the raceway.

Use the corresponding original curvature. Test the samples until they are qualified; clean the raceways and rollers (steel balls) with gasoline, apply grease, and complete the assembly.

The reason for the broken teeth of the rotary gear bearing may be that the quality of the cast section of the tooth base material (such as blisters, interlayers and other defects, which will significantly weaken the bending resistance of the gear); stones or steel bars are embedded in the meshing of the gear teeth during use. The hard object increases the local bending stress of the gear teeth and breaks.

The repair method is local repair welding or tooth insert repair. The method of local repair welding is: first grind off the residual crack matrix of the damaged part with a portable grinding wheel, clean it with gasoline (oil);

use a welding torch to preheat this part, After reaching the fixed temperature, use a medium carbon steel electrode to push and weld the prototype of the tooth on the damaged part of the tooth, so that it is 1-2mm higher than the tooth surface of the party; until the tooth shape meets the requirements.

When a whole tooth of the rotary gear ring is damaged, it can be cut along the root of the tooth, and then the tooth root is filed into a fixed shape, and then the next tooth is stored on the same type of waste ring gear bearing, processed into the corresponding shape of the base metal, and then placed into the groove, and use the toothed template to clamp the positioning.

In order to ensure the consistency of the tooth pitch, and after the double-wire chuck is used to increase the value, it is welded with low carbon steel around the tooth. Use a file and other tools to smooth the weld to ensure that the meshing of the gear bearing teeth is stabilized.