| CVC roll(Continuously variable crown)is the most representative roll in the shape control of wide-band steel hot rolling.Because the working characteristics of continuously changing the crown between rolls through roll shifting,it has been widely used in actual processing.However,during the sheet rolling process,the CVC rolls will wear out,which seriously affects the quality of sheet.Therefore,it is necessary to grind CVC rolls.For this reason,this paper designs a two-stage process parameter optimization for the large margin grinding of asymmetric wear and the stable grinding of the full stroke during the grinding process of CVC rolls.In the first stage,the grinding stability is taken as the objective,and the process parameter optimization method for grinding force homogenization is designed;in the second stage,the surface quality and grinding efficiency are used as performance indicators,and the optimization algorithm is used to optimize the process parameters to obtain a reasonable process Parameter combination.In the end,a comprehensive software on the PC side for the optimization of roll grinding process parameters was developed to provide a theoretical reference for the process personnel to perform grinding processing.The main work of this paper is as follows:An optimization method of grinding force homogenization process parameters has been proposed.According to the working characteristics of CVC rolls,the causes and morphology of its unique asymmetric wear are analyzed,in order to reduce the fluctuation of the grinding force during the large margin grinding process,to ensure the smoothness of grinding and improve the quality of grinding.The case verification shows that by using this process parameter optimization method,the fluctuation of the grinding force is significantly reduced.The influence of grinding parameters on surface quality of roller has been studied.Study the influence of roll grinding process parameters on surface quality.Through the research of the single sharpening traces,the trajectory of the sharpening movement is established,the surface morphology of the processing is synthesized,and the influence of a single factor on the surface morphology and surface roughness of the workpiece under each processing combination is studied.Compare the data of simulation and actual measurement,analyze the surface micro-topography of the workpiece,and obtain the change curve of surface roughness under different parameters,which provides theoretical support for the optimization of process parameters.A multi-objective process parameter optimization model based on GABP-NSGA? hybrid algorithm has been proposed.On the basis of sufficient experimental data,the Taguchi variance analysis is used to obtain the optimized search range of each process parameter.The GABP neural network surface roughness prediction model and the material removal rate formula are used as the fitness function,combined with the NSGA? optimization algorithm to construct a multi-objective Optimize the model and obtain the Pareto optimal solution set through global search of decision variables.After analysis,it can be seen that the multi-objective optimization model achieves the best comprehensive performance of surface roughness and processing efficiency.A comprehensive software for optimizing the grinding process parameters of roller has been developed.Use Qt to develop the UI interface and call the algor-ithm development package written by MATLAB to realize Qt-MATLAB mixed programming.The software uses OPC UA communication protocol to realize info rmation exchange with Siemens 840 Dsl server,and uses My SQL relational databa se for data management.Through this software,parameter optimization,machine tool monitoring,and data management can be carried out,providing a theoretical reference for process personnel to select process parameters,ensuring grinding q uality and improving grinding efficiency. |
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