Largeslewing bearingIt is one of the key components of large industrial equipment. The rotation mainly passes through the inner roller in the track raceway/ball to achieve. The contact between the roller/ball and the raceway is line-to-face contact and point-to-face contact, which will lead to greater stress concentration at the contact location. Therefore, there are strict processing requirements for rollers/balls and tracks. General processing procedures for forging rough machining quenching and finishing raceway surface flame surface quenching raceway surface grinding. Among them, heat treatment is an important processing technology, which can improve the mechanical properties of materials and release the residual stress during processing.

In the heat treatment project, the heating flame spray gun and the water gun are installed together and move in a circular motion around the slewing bearing track. However, the heat treatment process should be close to the movement.Stop before 360, because the heat treatment area cannot overlap, once overlapped, the workpiece will crack. Therefore, the inner and outer rings of the slewing bearing need to have an area that is not overheated, and this area will become the soft belt area. The wide band of the soft belt is generally 15mm, marked with s. During the installation of the slewing bearing, the soft belt area of the slewing bearing is required to be installed in the non-main bearing area. Generally, the soft belt area of the slewing bearing is required to be installed at a position perpendicular to the projection line of the pitch motion plane. The existence of the soft band zone has a significant impact onslewing bearingThe installation and use of a certain impact. Some scholars have proposed hot processing technology without soft zone, but this method is still in the conceptual design stage, has not yet entered the detailed design stage, and there is no corresponding heat treatment equipment. Compared with the traditional heat treatment process, the processing cost of this method is higher, and different diameter slewing bearings need to replace different types of inductors, which further increases the processing cost.

Pile drivers are personalized products,slewing bearingThe device needs to be designed according to the specific application and usage requirements. As an important part of the pile driver, its overall design strength and dynamic performance directly affect the working efficiency and safety factor of the whole foundation pile driver. According to the long-term statistical data, it can be seen that the early failure of the slewing bearing90% is caused by broken teeth, the main reason isslewing bearingThe design and selection can not meet the specific conditions of use.

The slewing bearing is mainly studied from the following aspects：

(1) The dynamic model of the slewing bearing device is established by using the torsional vibration model of the gear pair, and the dynamic performance of the slewing bearing device is obtained by dynamic simulation analysis. We can accurately analyze the operating speed of the slewing bearing slewing angle and the biting force of the gear, and then determine the preliminary slewing bearing axis.

(2) Based on virtual simulation technology, the influence of gear tooth modulus, tooth number and other structural parameters on the dynamic performance of rotating gears is studied, and a set of optimization design and selection methods of rotating bearing device are proposed. This method analyzes the deficiency of the dynamic simulation results of the rotating gear, and improves the dynamic performance of the rotating bearing device by changing the structural parameters such as the module and the number of teeth of the gear.

(3) On the basis of the optimization model of the slewing bearing device, the influence of the driving speed of the slewing motor, the gear backlash and the gear mesh stiffness coefficient on the dynamic performance of the slewing bearing device is studied by using dynamic simulation technology. If the construction in different construction environment, the dynamic load of the foundation pile driver will be different.