The Process Optimization Of Large-thin Nuclear Cylindrical Shell

With the reduction of non-renewable resources such as coal, oil, nuclearenergy has become the first choice for new energy because of its efficiency,clearance and other characteristics.Welding forming shell section with its lessworking hours and short production cycle, has become nuclear shell formingtrend.Large thin-walled nuclear shell production technology is essential on thesafe usage of nuclear energy. Conparing with molding shell technology, weldingshell technology is not mature enough. The nuclear shell is the inner componentof the nuclear reaction. Weld forming needs higher welding quality. The pressurevessel welding technology is mature in China, and has been in the forefront of theworld.Processing of large thin-walled nuclear shell includes cold and hotprocessing. Process optimization of large thin-walled nuclear shell mainly infersto process optimizing of the welding process and cutting tool. Nuclear fissiongenerates a lot of heat, which means that the shell works at a high temperatureand high pressure environment. The shell is welded from steel plate which isbended by steel plate bending machine. Welding will produce stress and stresscan cause deformation, although the follow-up process of the heat treatmentoperation will reduce the stress, we must do stress simulation, analysis,calculation of the maximum stress in the stress value of the extent permitted.Carried out a series of orthogonal test simulation in the field prior to soldering,the use of computer, through the comparative analysis of multiple sets ofsimulation results, the optimal simulation results, and thus a large thin-walledwelded tube optimal welding process.In order to achieve a virtual computeroptimization of the welding process, which reduces the waste of raw materials,but also shorten the production cycle.By analyzing the characteristics of large-scale nuclear torch inner groovecutting, according to the cutting of theoretical knowledge, the shortlisted sixcrude finishing tool, cutting parameters to develop a rough finish of the inner groove cutting, designing a large-scale thin-walledsimulation program, the use ofnuclear flashlight section of the inner ring groove cutting the cutting softwareThirdwave, cutting simulation under the same cutting parameters, the output ofthree-dimensional wave simulation results. From the deformation of theworkpiece and the tool index parameters to optimize large-scale nuclear torchinner groove cutting tool.In the deformation of the workpiece, respectively,comparative analysis of the size of the deformation of the workpiece under threerough finishing tool cutting, thus optimized for rough finishing tool from thedeformation of the workpiece, the cutting tool indicator parameters mainly refersto the residual stress of the cutting tooldeformation in three areas, the cutting tooltemperature and cutting tool. By contrast to the rough finish cutting toolperformance in these three areas, and thus the rough finishing tool from the toolcutting indicators optimization, the pros and cons of these two indicatorsparameter in the rough finishing cutting tool, and then preferably a large thinnuclear wall torch inner groove cutting rough finishing tool.