Finite Element Modeling And Deformation Analysis Of Connecting Rod Milling Of Marine Diesel Engine

With the rapid development of China’s shipbuilding industry,higher requirements are placed on the dynamic performance of ships.Diesel engines are one of the important powers of ships and it is particularly important to ensure their processing quality.The connecting rod is one of the core components of the marine diesel engine.The machining quality directly affects the power and service life of the diesel engine.Therefore,there is a very high requirement for the machining accuracy of the connecting rod.However,the slender parts structure of the connecting rod causes its rigidity to be relatively weak,and the processing rods are easily deformed during processing;at the same time,the connecting rods are unevenly loaded and vary greatly during the working process,and the cyclical variable load is borne.The working environment is more complex,which has a greater test on the overall processing quality of the connecting rod.Studying the connecting rod machining process and optimizing and improving the diesel engine has important theoretical significance for improving the machining quality of the connecting rod and reducing the machining defects.At the same time,it has important practical value for improving the overall working performance of the diesel engine.For the deformation of the connecting rod of diesel engine,the paper mainly studied the process of milling the connecting rod end face milling.The finite element simulation method was used to construct the cutting and clamping simulation model.The connecting rod machining process was simulated and the connecting rod was under different processing parameters.At the same time,relevant experiments were designed and the simulation and experiment were combined to verify the simulation results.The specific research content of the paper is as follows:1.Based on the link milling parameters,based on Deform-3D software,a link milling finite element simulation model was constructed to predict the residual stress of the link milling simulation and the formation of milling chips.In order to verify the accuracy of the simulation model,the simulation chip is compared with the actual chip to verify the accuracy of the simulation model.At the same time,the residual stress detection test is designed to detect the residual stress of the connecting rod,and the residual stress is compared with the simulated residual stress.Verify the accuracy of the simulation model and provide a theoretical basis for the model construction of the next simulation study.2.Using the above-mentioned milling finite element simulation model construction method,a link milling finite element simulation model was constructed to simulate the milling of the end face of the connecting rod,and the influence law of different milling parameters on the deformation of the connecting rod was studied,and then the connecting rod milling process parameters was optimized.Improve the quality of connecting rod processing.3.Based on ANSYS software,a link milling and clamping setup simulation model was constructed to study the influence of different clamping loads and fixture layout on the deformation of the connecting rod during the milling of the connecting rod.It provides a theoretical reference for the selection of the clamping scheme for the connecting rod milling process.4.The ANSYS software was used to superimpose the cutting force and the clamping force obtained from the link milling simulation.The effect of the superposition of the cutting force and the clamping force on the deformation of the connecting rod was simulated.It has been improved that the cutting and clamping of the workpiece were studied separately in the past during the study of the processing deformation of the workpiece,and the defects of the interaction were ignored.