Study On Cutting Simulation Of Key Valve Used In Super(Ultra-Super)critical Thermal Power Unit

The coal resources are non-renewable resources,thermal electric generation occupies theimportant position in China’s residential electricity.Application of the main power units,about90%of the key of high-end valve are made abroad and imported.Along with the depth ofnationalization of large thermal power unit equipment, The manufacturer must accelerate theresearch on the high-end valve used in Super(ultra-super) thermal power units.The valves usedin Ultra Supercritical thermal power units are more complex, the essential spots are be in higherdemand of the machining precision and surface quality. The machining precision and thesurface quality of the key parts of the valves is the key factor of restricting the use ofperformance of the valve.Large valves used in power generating units, using domestic common Steel of Boiler,which wastes of raw materials and is hard to recycling removal of material. In greenmanufacturing today,the material which can be100%recycled is undoubtedly the first choiceof the manufacturer. WB36(15NiCuMoNb) steel Imported from Germany has goodmechanical performance and can be completely recycled and resued,which meet the demand ofmachinery manufacturers.According to the mechanical properties of WB36materials,aiming at the problemsencountered in the machining process of valve, in view of the the characteristics of the valvebody, this article from two aspects, attempts to solve the problems encountered inmanufacturing.First, use tool with different materials to process valve body of wb36, contrastand Analysis the effect of tool with different materials on cutting force and temperature inboring process; second, adopt cantilever type and double support type boring bar in boringvalves, contrast and Analysis the effect on machining accuracy at the key part of the valvesbody in boring process with the two different types of fixtures in boring machine. With theabove assumption,at first,3D model can be set up in two FEM software (Boring by PCBNcutting tool in the AdvantEdgeFEM, Boring by Carbide tool in the3D-DEFORM), Both areusing single factor analysis method,then,simulates the boring process, attention is paid oncutting force and cutting temperature’s influence on the cutting tool under the various cuttingparameter, find the optimal cutting parameters; the three directions of the cutting force underthe condition of the optimal parameters and the boring bar’s gravity are loaded into the finiteelement model of simplified solid boring bar,which are all established in Ansys software,considering the effects of the boring bar’s gravity on machining accuracy in boring process. zThrough the research of simulation, research plan used in this paper,can better solve theproblem which the manufacturers encountered that machining accuracy in machining process was not up to the requirements. The research of simulation can replace the actual machiningexperiment,reduce the research cost, shorten the research cycle.