Research On High-speed Heavy Wheel Grinding In Nuclear Power High-pressure Vessel Shell Weld

The nuclear power high-pressure vessel such as nuclear reactor pressure vessel, evaporators, Regulators, has been known as the"heart equipment"of nuclear power station. The manufacturing level of its shell weld affects the manufacturing cost, efficiency, and useful safety of nuclear power station. As a sophisticated efficient processing, High-speed heavy grinding has been more and more used Manufacturing Shell weld in nuclear power high-pressure vessel. But so far the High-speed heavy grinding using in shell weld of the nuclear power high-pressure vessel has not been researched completely and depth. And therefore the study that 16MnD5 Steel typical nuclear power high-pressure vessel materials high-speed heavy grinding technology with a very typical significance. Not only can enhance nuclear power high-pressure vessel manufacturing technology, but also help to promote high-speed heavy grinding application in processing nuclear power high-pressure vessel, and direct actual manufacturing.The main efforts of this paper follow:â‘ The grain size of grinding wheel more rough, the greater the average material removal rate. Grinding depth is the essence determining factor of high material removal rate using high-speed heavy grinding, greatly affected material removal rate. With the increasing of grinding depth, material removal rate significantly increase. Along with the increased of grinding wheel speed, the material removal rate also increased. But when the wheel speed increased to a certain value, the increase of material removal rate has slowed down. When grinding feed rate increases, the material removal rate increase.â‘¡In the case of the metal removal rate maintain constant, increase of wheel speed means increase grain number in unit time through the grinding regional, will result in each grain cutting depth decreases, thinning chip, chip cross-sectional area decreases. Meanwhile other condition, the relationship of grain size effect grinding force is that grinding force greater with minor size. Grinding depth increases, making largest cutting unreformed thickness of single grain increases. Meanwhile the effective grain that participate grinding increasing, resulting in grinding force increased and the most significantly impact. Along with the grind feed rate increases, grinding force is always maintained good trend with grind feed rate increasing.â‘¢Improve grinding wheel speed, increase the grind depth and improve workpiece speed may increase grinding efficiency. But the heavy grind depth grinding, it will be more serious burns. Through process optimization method can solve the problem.â‘£In conditions of determining grinding feed rate and grinding depth, the increasing of wheel speed means increase grain number though grinding regional in unit time, will result in each grain cutting depth decreases, thinning chip, chip cross-sectional area decreases. Therefore, the effective grinding force decreases. Wear rate is down. Improve the durability of the wheel.