Slewing bearing raceways delamination repair broken tooth ring gear

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Construction machinery back to stop supporting material stomatal or dissection, the raceway Tour hardened layer hardness, depth of manufacturing quality problems such as uneven or some external reasons, caused the raceway hardened layer peelin g or broken tooth ring gear and equipment will not job.NTN bearig
Raceway stripping layer, the first to make the correct judgment. The peel layer, generally not easy to see in the external. According to our experience, the following occurs raceway delamination: the host load rotation raceway at uneven slightly - slightly abnormal sound, rotation speed or an azimuth slowed significantly and accompanied by the slight vibration; rotary motor temperature is too high or the current is too large; rotary motor and hydraulic couplings or coupling, etc. keyway pushed bad.

Delamination appears, must be repaired promptly. Otherwise, delamination area will be expanded to the entire slewing bearing scrap.

Repair: the first roller or ball slewing ring removed, so that the separation of the inner and outer rings; then gasoline to clean raceway care; then grinder (wheel) the U.S. Microsoft needles de lamination area hardened layer has been generated around the crack wore off, the bottom of the delamination polished; raceway requires welding at welding and cutting torch preheat in carbon steel electrode welding (welding rod use before drying, and with the drying with the use), to make the raceway surface welding layer of slightly more than 1-2mm; stripping layer deeper or larger, layer and section welding, do not make the base metal temperature is too high and cause deformation; This avoids rapid cooling weld cracking insulation measures should be taken immediately, he gradually cooling after welding. After cooling grinder grind repair welding layer, making it slightly higher than the raceway surface oil stone or metallographic emery cloth mill Repair welding layer table gradually repair it with normal surface raceway highly consistent, with the corresponding original curvature model testing, until qualified; clean with gasoline coated with grease on the raceway and rolle r (ball), and assembled into one to complete.FAG bearing

Convenience equipment such as tower cranes slewing ring raceway above normal after long-term use.

May be due to the rotating ring gear teeth broken tooth base metal casting quality problems (if any defects such as trachoma, mezzanine, so that the bending effect of the gear teeth meshing at significantly reduced); process of using embedded stones or reinforced a hard object, so that the the tooth local bending stress increases fracture.

Repair local repair welding, or tipped repair, partial repair welding method: first damage to parts of the residual matrix crack rubbed off with a hand-held grinding wheel, clean gasoline (oil); preheated with a torch in this part of When you reach a certain temperature in the the tooth damage the parts in carbon steel electrode push welding the prototype of the tooth, making it higher than the political parties tooth surface 1-2mm; selected experienced machine repair fitter, in accordance with the toothed template detection until the toothed compliance requirement.

When a slewing ring gear tooth damage, cut along the tooth root, then the tooth root file into a certain shape. And then cut a tooth in the ring gear of similar waste storage, processed into shape corresponding to the base metal into the slot, with toothed template snaps into place. To ensure consistency and with the double wire chuck appreciation tight, low-carbon steel welded around the teeth tooth pitch. Final rasp tools such as the weld Shuhei to ensure teeth meshing augmentation can.grinding spindle