Simulation Analysis On The Conical And Curved Combined Surface D For Extrusion Assemble Of Spherical Plain Bearing

The spherical plain bearing is widely used in water conservancy and navigation,military equipment,aerospace and other fields.It has the characteristics of simple structure,large carrying capacity,long service life and strong impact resistance.In the process of assembly and forming,the spherical plain bearing is often affected by the structure of the extrusion die and the size of the bearing blank,which causes problems such as low assembly precision of the spherical plain bearing and uneven bearing clearance.Therefore,it is of great significance to systematically study the blank size of the spherical plain bearing and the structure of the extrusion die.This paper aims at exploring the deformation characteristics of the inner and outer rings of the bearing during the extrusion process of the spherical plain bearing,the finite element model of the spherical plain bearing extrusion is established based on a machining method of the spherical plain bearing without the inner ring.The forming characteristics of the bearing during assembly and forming process of the spherical plain bearing and the influence of the structure of the extrusion die on the bearing forming were studied.The deformation process of the outer ring of the spherical plain bearing under the action of the extrusion die was studied theoretically based on the basic principle of pipe fitting and metal plastic forming theory,and the theoretical formula of the extrusion force required for the deformation of the outer ring of the bearing was derived.The structural dimension of the bearing outer ring blank was deduced by the energy method,and the limit size expression of the bearing outer ring blank was obtained.According to the die design criteria,the structural parameters of extrusion die for spherical plain bearing were analyzed.It has been found that the formation of the spherical plain bearing is mainly affected by the initial structural size of the bearing blank,the deformation hardening effect of the bearing deformation,the additional bending moment and the structural parameters of extrusion die.Based on two kinds of extrusion dies of conical surface and curved surface,the finite element model of extrusion forming of spherical plain bearing was established,and the extrusion process of spherical plain bearing was simulated.The forming characteristics of the two die structures were summarized by analyzing the deformation characteristics of outer ring radius,radian and extrusion force and curvature of the outer ring and the extrusion force required for the deformation during the extrusion process of the spherical plain bearing.According to the forming characteristics of the conical surface die and curved surface die structures,a conical and curved combined surface die structure was proposed.The feasibility of the conical and curved combined surface die structure is verified through simulation analysis,and the problems of crushing or insufficient ability of closing of bearing outer ring were improved.In order to further study the influence of extrusion die structure on the extrusion assembly and forming of the spherical plain bearing,the structure of the conical and curved combined surface die was standardized by using the die design criteria.The finite element model of bearing extrusion forming was established and the bearing extrusion process was simulated.The structural parameters of the conical and curved combined surface die were studied by taking the clearance value of the inner and outer rings of the spherical plain bearing after the extrusion forming as the reference value.The influence of various structural parameters of the extrusion die on the quality of the bearing extrusion assembly was obtained.This has important practical significance for the design of the spherical plain bearing extrusion die and the improvement of the spherical plain bearing forming quality.