Finite Element Analysis And Optimization Of Process Parameters For Hot Extrusion Of Sliding Bearing Preforms

The sliding bearing is one of the key and important parts of the diesel engine.It bears the alternating effects of cylinder burst pressure,high thermal load,and inertial force of the connecting rod.Its performance has an important impact on the reliability,safety and service life of diesel engines.This type of sliding bearing mainly selects a high-strength wear-resistant copper alloy,which is processed by a near net forming process,and its shaped parts should have good high and low temperature mechanical properties,friction and wear properties.With the continuous development of diesel engines in the direction of "three highs and one low",higher requirements have been placed on the forming quality of sliding bearings.The main factors affecting its forming quality are spinning process parameters and forming quality of preforms.Taking the tin bronze sliding bearing of small end connecting rod as an example,this paper mainly analyzes the forming quality of preforms by adopting the method of numerical simulation and optimization of process parameters in order to improve the forming quality.The main research contents are as follows:1?Based on UG 3D software and Simufact.forming finite element analysis software,the hot extrusion finite element model of the tin bronze sliding bearing preform was established,and the forming process was simulated.Then the single factor test method was used to study the influence of extrusion temperature,extrusion ratio,punch shape,die radius,punch radius,punch working belt length on damage value and forming load.2?Through theoretical analysis of single-factor test results,the extrusion temperature,extrusion ratio,punch shape,and die radius are selected as the test factors,and the damage value is selected as the evaluation index of forming quality.The orthogonal test method is used for simulation.The damage values corresponding to all combinations are obtained.Finally,the Taguchi algorithm is used to process the data in the orthogonal table to obtain the optimal hot extrusion process parameter combination of the sliding bearing preform and the order of the degree of impact of each extrusion process parameter on the damage value.3?Based on the above simulation results,the hot extrusion test was carried out on the sliding bearing preforms,which verified that the simulation results had good reliability,and then provided a theoretical basis for hot extrusion processing of the sliding bearing preforms.