Maanshan Fuyong Intelligent Technology Co., Ltd.
Bearing Slewing Gear Processing Technology

Bearing Slewing Gear Processing Technology

First, understand the process steps of gear processing of bearing slewings. You must first understand the material of the blank and the processing conditions after forging. Secondly, check whether the blank has defects such as lamination or cracks. Measure the contour size of the blank shape, including the inner diameter and outer diameter of the blank, the height dimension and the calculation of the machining allowance. It can accurately estimate the number of cutting tools used for turning. The blank of the bearing slewing can be divided into two categories: normalizing treatment and quenching and tempering treatment.


1. Turning processing 

(1) Rough turning


(2) Rough turning aging


(3) Fine tuning


(4) Forming precision turning


(5) The inner ring of the cross three-row roller slewing ring is specially treated to prevent the inner ring of the cross-three-row roller slewing ring from deforming after heat treatment. Turning must be performed in pairs, that is, the raceways are processed back to back. No cutting is performed before heat treatment and no cutting is performed after heat treatment.


(6) Finish turning after heating


2. Heat treatment

(1) Raceway surface quenching: The bearing slewing raceway surface is quenched at an intermediate frequency to ensure that the hardness is not less than 55HRC, the depth of the hardened layer is not less than 4 mm, and the width of the soft belt is less than 50 mm. The corresponding position is marked with "S".


(2) After heat treatment: the bearing slewing inner ring and outer ring need to be quenched at 200 degrees for 48 hours before leaving the furnace. To ensure the disappearance of internal stress and prevent subsequent cracks. After the slewing ring manufacturer has heat treated and tempered each batch of slewing ring bearings, magnetic particle inspection is required to prevent cracks.


3. Gear manufacturing

(1) Certain bearing slewings used under severe working conditions require surface hardening treatment, such as in the field of excavators, pile drivers, wooden grabs, graders and other working conditions. They have relatively large impact loads and require quenching on the surface.


(2) With the rapid development of Industry 4.0, bearing slewings are more and more widely used in the automation industry. In this application field, the accuracy of teeth is relatively high, and the minimum requirement is also 8-level accuracy.


(3) After the gear manufacturing process is completed, there are follow-up processes, such as fine turning, plane, drilling, track grinding and assembly, and then the bearing slewing can be delivered.

  • Causes of Heating during the Use of Slewing Bearing

    Causes of Heating during the Use of Slewing Bearing

    December 30, 20201. Analysis on the causes of heating of slewing bearings:Possible reason 1:The shaft size of the slewing bearing is too large that the bearings will be tight.Solution:Provide an appropriate tolerance ...view
  • The Causes and Solutions of Heating in the Use of Slewing Ring Gear

    The Causes and Solutions of Heating in the Use of Slewing Ring Gear

    February 4, 2021Ⅰ. Analysis of the cause of heating of slewing ring gearPossible reason 1 for heating of slewing ring gear:The shaft size of the slewing ring gear is so large that the bearing will be tightened.Possi...view
  • Maintenance of Slewing Ring Bearing

    Maintenance of Slewing Ring Bearing

    December 17, 20201. Precautions for the operation of slewing ring bearing:Before installing the slewing bearing, check the installation surface of the main engine first, and the support should have sufficient strength...view
  • How to Improve the Performance of the Slewing Ring?

    How to Improve the Performance of the Slewing Ring?

    December 17, 2020China slewing ring bearing is a very useful machine part, and it has very powerful functions and help. For everyone, it is very important to develop and research on this product. At the same time, it ...view