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Structural optimization of radial joint bearings

by:JNSN     2021-12-28
As a general-purpose component, the radial bearing has the characteristics of flexible rotation, compact structure, easy assembly and disassembly, and can meet the requirements of heavy load and long life. It has been widely used in mining, metallurgy, electric power, transportation, aerospace and textiles. Mechanical equipment[1]. The research on joint bearings and the corresponding industrial production in our country started relatively late, generally by referring to foreign data or determining the relevant technical data based on actual experience, which lacks scientific basis. Based on this, we use the large-scale finite element analysis software ANSYS for the finite element analysis of the radial spherical plain bearing GEZ101ES. While keeping the dimensions of other assembly-related parameters unchanged, we optimize the spherical diameter of the spherical plain bearing to make the radial The distribution of the stress on the joint bearing is more reasonable, in order to achieve an optimized design and improve the life of the joint bearing [2]. Experimental part 1 Structural optimization ANSYS program is a powerful, large-scale general-purpose finite element analysis software that integrates design analysis and optimization. Before the design plan is adopted or put into production, the optimization design function of ANSYS program can accurately find out its potential design defects or determine the best geometric shape, shorten the development cycle of multiple machine manufacturing, test and remanufacturing, and reduce production costs . The radial joint bearing developed by Fujian Longxi Bearing Co., Ltd. through the introduction of foreign technology is selected as the research object. The outer ring and inner ring are hardened by GCrl5 bearing steel, the elastic modulus is 212 GPa, and the Poisson's ratio is 0.29. The density is 7.8 g/cm. , The tensile strength is 2 155 MPa, and the compressive strength is 3 725 MPa. Figure 1 shows the schematic diagram of the GEZ101ES radial joint bearing. In order to make the simulation closer to the reality, an axis is introduced into the model. Since the radial spherical plain bearing has a Fig. 1 Schematic diagram of radial spherical plain bearing, the structure of the radial spherical plain bearing is characterized by symmetrical structure, so when the finite element structure model is created, only 1/4 of the overall structure is used for simulation. The finite element analysis of articulated bearings adopts solid modeling and uses the solid element SOLID92 with 10 nodes of tetrahedron. It has 3 degrees of freedom, such as, Y, and z. It is suitable for the simulation of irregular geometric shapes and has high calculation accuracy. The number of nodes and mesh elements generated during free meshing can be different; the finite element meshing is denser, so that the stress concentration area of u200bu200bthe radial spherical plain bearing can be displayed more clearly. The GEZ101ES radial joint bearing is a steering multi-function bearing, and its force is more complicated, so it must be simplified when performing finite element analysis. Since radial load is the main factor that affects the bearing capacity and service life of GEZ101ES radial spherical plain bearings, the effect of radial load is mainly considered; and under the service conditions of spherical plain bearings, the rate of rotation or swing is funded by the project; the aviation science fund project ( 04G52044). Very slow, in most cases no more than 6 revolutions per minute (swings), so the quasi-static model can be used in the finite element analysis of the joint bearing. At the same time, the articulated bearing has a symmetrical structure. In order to reduce the amount of calculation, ANSYS stipulates that 1/4 of the overall structure can be used for calculation. Taking the ball diameter of GEZ101ES as the reference size, take the change of the ball diameter in sequence as 0, +0.5 mm, +1.0 mm, +1.5 mm, -0.5 mm, and 1.0 mm. , One is 1.25 mm, one is 1.5 mm (0 means the original size remains unchanged, positive sign means size increase, negative sign means size decrease), solve them separately. Since the joint bearing is subjected to compressive stress under service conditions, and the failure is due to the contact fatigue under the compressive stress, this article mainly calculates the maximum compressive stress of the bearing; while keeping the relevant dimensions of the assembly unchanged, by changing the joint bearing The diameter of the ball is used to calculate the change in the maximum compressive stress experienced by the bearing. Figure 2 shows the GEZ101ES centripetal joint D change quantity/ram Fig 2 The 3rd primary stress s. Variation of spherical diameter for GEZ101ES Figure 2 The relationship curve of compressive stress with the change of bearing ball diameter. The relationship curve of the absolute value of the third principal stress of bearing 0'3 (that is, the maximum compressive stress) with the change of ball diameter D. It can be seen that , The maximum compressive stress of the spherical plain bearing is closely related to the change of the spherical diameter. When the spherical diameter increases from 0.0 mm to 1.5 mm, the maximum compressive stress of the spherical plain bearing increases greatly; When the size is reduced from 0.0 mm to -1.5 mm, the maximum compressive stress fluctuates, which depends on the structural nonlinearity. When the size of the ball diameter is reduced by 1.0 mm, the maximum compressive stress of the joint bearing The smallest. The material of the radial spherical plain bearing is quenched and tempered GCrl5 steel with low temperature, and its structure is tempered martensite, which is a brittle material. Therefore, the first strength theory or the second strength theory should be selected for verification. In view of the first strength The theoretical form is simple and does not affect the calculation results, so this paper adopts the first strength theory to check, that is, ≤[ ], or ≤[ v] (. Is the first principal stress,. Is the third principal stress). When the original data is unchanged (UP change is 0 mm), the overall maximum compressive stress of the bearing (the maximum value of the absolute value of the third principal stress 0'3rain) is l. The blood pressure is 1 1623.4 MPa; when the ball diameter is reduced by 1 mm, the maximum compressive stress of the bearing as a whole is 1150.1 MPa. It can be seen that when the size of the ball diameter is reduced by 1.0 mm, the maximum compressive stress on the bearing is reduced from the original 1623.4 MPa to 1150.1 MPa. Therefore, the ball diameter of the radial spherical plain bearing GEZ101ES reduced by 1.0 mm is determined as the optimal value.
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