Slewing bearing fault repair method

Construction Machinery Stainless steel slewing bearing material porosity due or mezzanine, swim raceway hardened layer hardness, depth manufacturing quality problems such as uneven or

Some external reasons, resulting in hardened raceway spalling or broken tooth ring gear, equipment will not work.
For raceway delamination, we must first make the right judgments. Delamination occurs, generally the external hard to see. According to our experience,

In the following cases, indicating that there is delamination raceway: Host load rotates, the raceway has "slightly - slightly" abnormal sound, rotation speed

Uneven or an azimuth slowed significantly and accompanied by a slight vibration; rotary current motor temperature is too high or too large; Rotary

Motor and hydraulic coupling or coupling pushed up bad habits such as keyways.
Delamination occurs, it must be repaired. Otherwise delamination area will be expanded to the entire slewing bearing scrap.
Repair method is: first slewing roller or ball inside out, so that separation of inner and outer rings; reuse gasoline to clean raceway

Clean; Then grinder (wheel) Microsoft Corporation needle carefully peel layer surrounding area has been hardened cracks generated

Layer rubbed off, the bottom layer will peel polished; raceway required for welding and cutting torch at the preheated by using carbon steel welding rod (electrode before

Be dried and used as baking), to make the solder layer just above the raceway surface 1-2mm; deeper if delamination or larger, should be divided

Layer fragmentation welding, do not make the base material caused by high temperature deformation; This avoids rapid cooling weld cracking, immediately after welding

Insulation measures taken so that he gradually cooled. After cooling grinder grind welding layer, making it slightly above the raceway surface, oil stone

Metallographic grinding or welding layer gradually emery cloth table it with the normal surface raceway highly consistent with the corresponding original curvature model testing,

Until the qualifying date; clean with gasoline raceway and roller (ball) coated with grease, integrally assembled to complete.
Facilitation by the above method of tower cranes and other equipment slewing ring raceway, after long-term use is working properly.
Swing ring gear teeth broken reason may be that the tooth base material quality cast segment (if trachoma, sandwich and other defects, the teeth

Round bending effect significantly weakened); process of using tooth contact inserts of hard objects such as stones or reinforced, so that local bending tooth

Stress increases fracture.
Repair method is a local repair welding or tipped, local welding method is: first damaged parts of the residual matrix crack

Rubbed with a hand wheel, gasoline (oil) clean; welding torch used in this part of the warm-up, when it reaches a certain temperature, the use of

Carbon steel welding rod damaged areas in the teeth of the toothed push welding prototype, making it higher than the party Tooth 1-2mm; send experienced

Machine repair fitter, in accordance with toothed model testing, until tooth compliance requirement.
When the rotary ring gear of an entire tooth is damaged, cut along the tooth root, tooth root and then file into a certain shape. Again in the same

Waste storage ring gear cut a tooth, processed into the appropriate shape with the base material, into the slot, with the tooth template snaps into place.

In order to ensure the consistency of pitch, and added with double wire clamp after tightening the teeth surrounded by low-carbon steel welding. Finally, rasp and other working

Shuhei with the welds to ensure stability augmentation to tooth contact.