Research Of The Supporting Technology Of Highly Efficient Abrasive Belt Grinding In Grinding The Material Of Shell Welding Seam Deposited Metal Of High-pressure Vessels For Nuclear Power

Because of the special properties of high-pressure vessels for nuclear power, not only the parent material but the material of deposited metal should have many excellent performances such as high intensity, temperature resistant and corrosion resistance. At the present time many countries mostly weld the parent material of the shell by Cr-Nb stainless steel, lean alloy steel, etc. And deposited metal should be processed smoothly for still water and stress corrosion resistance. Abrasive belt grinding, called universal grinding, as an important branch of grinding technology, has many excellent performances, like high efficiency, little vibration and low temperature, and it is widely used in the grinding, lapping and polishing of many kinds of metal and nonmetal material.â‘ Research Contents1) The domestic and foreign research actualities are collected and concluded. The grind ability of some typical material is analyzed in this thesis. Considering the machining requirements of deposited metal surface, some main evaluating indicators of abrasive belt grinding ability are brought forward.2) The material of deposited metal including Inconel690, 20Cr-10Ni electrode on the parent material 16MnD5 has been chosen as the research object. The experiments of material removal rate of the material of deposited metal have been finished, and the relationships of material removal rate, belt wear and grinding parameters, species of abrasive, contact wheel and major factors affecting grinding force are studied.3) The microstructure of work piece after grinding and abrasion of belts are observed by using the SEM.â‘¡Research Findings1) The results indicate that ceramic grain belt has high and steady material removal rate, and it is feasible to grind the material of deposited metal in big depth with this belt.2) It also proves that, the type of grain is the most distinct in the influence of material removal rate, belt speed and grinding time are the second, the rate of contact wheel and rotate speed of work piece are the last one in rough machining with a certain grinding depth.3) Considering the grinding efficiency, surface quality and abrasive of belt, the recommendatory process parameters are offered.