Modeling And Optimization Of Process Parameters For Conical Roller Non-continuous Rolling Of Continuous Helical Blade By Numerical Simulation

The continuous helical blade is the core part of the screw conveyor and screw pump.The different side roller rolling forming process is the most widely used one currently,but this forming process is so complex,adjusting rolling process parameters has always been the difficult problem of the different side roller rolling.In order to solve this problem,in this dissertation,based on the theory of continuous helical blade rolling,finite element analysis of rolling process and finite element analysis of friction and wear,and building rolling process parameters modeling and multi-objective optimization based on performance analysis results.The specific work content and research results are as follows:?1?The mechanism and forming law of continuous helical blade rolling with different sides were systematically studied.The mathematical model of the screw diameter and pitch is established;the roller surface equations of the right and left cone roller in the coordinate system are established,the boundary constraints that need to be satisfied for continuous helical blade rolling are deduced in detail.It lays the theoretical foundation for the follow-up rolling of the different side roller rolling and the optimization of process parameters.?2?A 3D model and finite element model of continuous helical blade rolling with different sides were established,the finite element simulation was performed on the rolling process of continuous helical blade cone roller,and its rationality was verified.The process parameters?feed height,relative translational volume,pressure parameters of roller,friction coefficient,rolling speed?were discussed in detail of the influence of screw diameter and pitch on the law;Analysis of the impact of the process parameters on the cone roller loading force,rolling damage value,the maximum principal stress and the maximum principal strain.These laid the foundation for the further establishment of an optimization model.?3?The mechanism of the wear of the tapered roller and the failure mode were discussed,the preventive measures to improve the service life of the roller were proposed;Through the finite element simulation of the roller wear during the rolling process,the higher hardness of the rolled material,the greater wear of the cone roller;the higher hardness of the cone roller,and the smaller wear of the cone roller;The service life of the roller was predicted.Finite element analysis of the cone roller friction and wear quantity,and predict the service life of the cone roller.?4?Multi-objective optimization was performed for the continuous helical blade rolling process parameters of the conical roller.A Central Composite Design?CCD?was used to design the test parameters,Mathematical model equation were constructed between D,T,R,XLOAD,DAMAGE,MAXSTRESS and process parameters?H?S₂?TT?V?using Response Surface Methodology?RSM?;the interactive influence of the process parameters on the shape of the helical blade and the interactive influence on the performance of the helical blade are studied;and the maximum wear depth and destruction,D,T,and R combine to form multiple objectives.The rolling objectives D₀ and T₀ are optimized to obtain a set of optimal solutions.This dissertation perform the finite element simulation of the helical roller on the different side of the helical roller to replace the actual debugging,and a multi-objective optimization model was established to obtain the best combination of process parameters.This method provides a new method for the quick adjustment of the process parameters of the rolling with different sides.It lays a solid foundation for the wide application of this process of cone-roller roll forming.