| Single row and four-point contact slewing bearing consists of inner and outer ring and rolling body,etc. Looking from the structure, it is relatively simple. But the movement and force under the actual working condition are very complex. So the study on slewing bearing can not only consider the problem under static load, but also need to study the force and movement of the actual working condition. This paper takes the QWA1312.45 type single row four-point contact slewing bearing as the research object. And it is based on SolidWorks and ABAQUS software to establish the finite element model of slewing bearing. It uses the ABAQUS/Explicit dynamic analysis module to simulate and calculate the actual operation process. This paper studies the axial load, temperature and rotating speed in the process of the rotation of the rotary bearing under the changing rule of the displacement, velocity and acceleration. The main research contents are as follows:1. This paper introduces the structure characteristics of the slewing bearing and the common classification. And it analyzes the work principle through the single row four-point contact slewing bearing as the research object. At the same time, according to the Hertz Contact Theory, the stress and deformation formula of slewing bearing is deduced under different loads. Finally, according to the above formula, we calculate the contact stress of the research object for QWA1312.45 type four-point contact single row slewing bearing, providing a reference for further finite element analysis.2. We need to establish QWA1312.45 type single row four-point contact slewing bearing 1/84 entity model by using SolidWorks and to make relevant processing settings in the ABAQUS software. We calculated the slewing bearing contact stress in normal temperature and. At the same time, we take the slewing bearing for finite element analysis at the environment of 150 ℃,300 ℃. The results show that slewing bearing contact stress was ignificantly increased with the increase of working environment temperature. It mainly due to thermal stress caused by rising temperature. Finally considering the reverse branch to undertake tentacles alpha, raceway and rolling the sphere radius r, R ratio, roll the sphere R, the depth of hardening layer and the influence of such factors as race hardness, using the orthogonal experiment analysis it is concluded that the bearing capacity of the strongest parameters combination.3. The slewing bearing finite element model is established based on SolidWorks and ABAQUS software, And it uses the ABAQUS/Explicit dynamic analysis module to simulate and calculate the actual operation process. Through the analysis, we can conclude that the rotation and changes in the distribution of stress in the process of displacement, the change law of the velocity, acceleration and contact stress. The analysis results can be seen that the maximum contact stress of each rotation occurs in the contact area between the outer rolling circle and the rolling body, and the contact position is elliptical. Due to the dynamic simulation of slewing bearing model does not consider the actual lubrication and simulation analysis for a while, it has yet to reach the complete stable state in the initial velocity and impact load, the simulation analysis of dynamic response of amplitude fluctuations. Also the slewing bearing outer ring operates at the same time as the revlution and rotation, alternating with inner and outer rolling contact ring, and frequency of contact with the outer ring rotation velocity was positively. These results are in line with the actual operation of the rotary support, and can provide a theoretical basis for the structural design and strength analysis of the rotary support and other further research.4. Based on the optimized in this paper, the third chapter analysis of the slewing bearing is verified, we found the contact stress of slewing bearing raceway decrease obviously and the carrying capacity increase as well. |
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