Repair slewing ring raceway delamination and broken teeth of the ring gear
Because of construction machinery rotary bearing material pores or interlayer, raceway swim hardened layer hardness depth uneven manufacturing quality problems or some external reasons, resulting in hardened raceway spalling or ring gear teeth broken, the device will not work properly .
For raceway delamination, first to make the right judgments. Delamination occurs, generally easy to see outside. According to our experience, when the south following cases illustrate the raceway delamination: The host with the load swing, raceway has "slightly - slightly" abnormal sound, uneven rotation speed or a bearing slowed significantly and with a slight vibration; rotary motor temperature is too high or too much current; rotary motor and a hydraulic coupling or coupling keyway pushed like bad and so on.
After delamination occurs, it must be promptly repaired. Otherwise, delamination area will be expanded so that the entire slewing bearing scrap.
Repair methods are: first slewing ring roller or ball inside out, so that separation of the inner and outer ring; then gasoline to clean the raceways; then grinder (wheel) Microsoft Corporation needle carefully peel layer region hardened layer cracks around the generated rubbed off, the bottom delamination polished; raceway need for welding with a welding torch at the preheating, with carbon steel welding rod must be dry (before electrode use, and with the drying with the use), to make the solder layer is slightly higher than the raceway surface 1-2mm; if delamination deeper or larger, should STAGED welding, do not make the base metal caused by high temperature deformation; this avoids rapid cooling weld cracking, insulation measures should be taken immediately after welding, so that he gradually cooled. After cooling, polished with a grinder welding layer, making it slightly above the raceway surface, oil stone or emery cloth metallurgical gradually grinding welding layer table, making it highly consistent with the raceway surface normal, with the corresponding original curvature model testing, until qualified so far; clean with gasoline raceways and rollers (ball) on a greased, assembled into one to complete.
Slewing ring broken teeth reason may be that the quality of the cast tooth segment of the base material (if trachoma, mezzanine and other defects, so that the bending effect is significantly reduced gear); use of the process of engagement tooth embedded stones or steel etc. hard, so local bending stress increases tooth fracture.
The fix is ??a local welding or tipped repair, partial repair welding method is: first the remnants of damaged parts crack the matrix using a hand wheel rubbed off, cleaned with petrol (oil); in this part of the warm-up with a welding torch, When it reaches a certain temperature, carbon steel welding rod in the tooth with the damaged parts of the tooth pushing welding a prototype, making it higher than the party tooth surface 1-2mm; selected experienced fitter machine repair, in accordance with the tooth model testing, until the tooth meets the requirements so far.
When the rotation of the ring gear of a whole tooth is damaged, cut along the tooth root, then root file into a certain shape, as shown in FIG. Again on similar waste storage ring cut a tooth, the base material is processed into a correspondingly shaped, into the slot, stuck positioning tooth template. In order to ensure the consistency of the tooth pitch, and after a two-wire chuck value with tight around the tooth with a low carbon steel welding. Finally, rasp and other tools to weld Shuhei ensure stability augmentation to tooth contact.
