Treatment of broken tooth of ring gear for peeling layer of slewing bearing raceway

The equipment can not work normally because of material porosity or interlayer, hardness and unevenness of hardening layer of raceway or some external reasons, which cause the hardening layer peeling off or gear ring breaking.

As for the stripping layer of raceway, the correct discrimination must be made first. Exfoliation occurs, which is not easy to see on the outside. According to our experience, it is clarified that the raceway has peeling layer when the main engine rotates under load: when the main engine rotates with load, there is abnormal sound at the raceway, the rotation speed is uneven or the speed in a certain direction is significantly slowed down and accompanied with slight oscillation; the temperature rise or current of the rotary motor is too high or the key groove of the rotary motor and the hydraulic coupling or coupling is squeezed.

It is necessary to correct it in time. Otherwise, the stripping area will expand and the whole slewing ring will be invalid.

The treatment method is: first take out the roller or steel ball in the slewing ring to separate the inner and outer rings; then clean the raceway with gasoline; and then peel the needle of Microsoft company carefully with a polishing machine (grinding wheel) The hardened layer with cracks around the layer zone shall be ground off, and the bottom of the stripping layer shall be smoothed; the welding torch shall be used to preheat the repair welding area of the raceway, and the welding layer shall be slightly higher than the surface of the raceway by 1-2mm (the welding rod shall be dried before use, and it shall be used as soon as possible) to make the welding layer slightly higher than the raceway surface by 1-2mm; if the peeling layer is deep or the area is large, the welding shall be carried out in layers and sections, and the base metal temperature shall not be too high to cause deformation In case of welding crack during rapid cooling, insulation measures should be taken immediately after welding to make it gradually cool off. After cooling off, grind the repair welding layer with a polishing machine to make it slightly higher than the surface of the raceway. Gradually grind the repair welding layer surface with oilstone or metallographic abrasive cloth to make it consistent with the height of the normal surface of the raceway. Use the corresponding original curvature template to test until it is qualified. Clean the raceway and roller (steel ball) with gasoline, apply grease, and assemble into one.

For more information, consult slewing bearing manufacturer for details.