核主泵用流体静压密封环圆锥面超精密磨削

提出采用工件旋转杯形砂轮切入磨削原理来加工核主泵用流体静压密封环圆锥面新方法，对密封环圆锥面的径向轮廓误差随砂轮半径、回转台与砂轮中心距，砂轮俯仰角、砂轮侧偏角的变化规律进行深入分析，发现选择适当的机床结构参数，采用工件旋转杯形砂轮切入磨削原理加工核主泵用流体静压密封环圆锥面时，由磨削原理引入的径向轮廓误差极小，为纳米量级。根据最小径向轮廓误差和最小磨削接触弧长原则确定了核主泵用流体静压密封环圆锥面的超精密磨削实现策略。在工件旋转杯形砂轮切入磨削机床上实现了核主泵用碳化硅密封环圆锥面的高精度、低表面粗糙度磨削，测得周向跳动、径向轮廓误差和表面粗糙度Ra分别为0.16 m、0.15 m和3 nm。

Ultra-precision Grinding of Conical Surfaces of Hydrostatic Mechanical Seal Rings Used in Reactor Coolant Pumps

Infeed grinding using a rotary table and a cup wheel is proposed to process the conical surfaces of the hydrostatic mechanical seal rings used in reactor coolant pumps. The substantial influence of the wheel radius, the distance between the rotary table and the wheel, the wheel pitch angle and the wheel roll angle on the theoretical radial profile error of the generated conical surface is analyzed thoroughly and comprehensively. A strategy for the implementation of ultra precision grinding of the conical surfaces of the hydrostatic mechanical seal rings used in reactor coolant pumps based on the minimum radial profile error and the minimum grinding contact length is determined. A hydrostatic mechanical seal ring sample made of silicon carbide that can be used in reactor coolant pumps is machined with very high form accuracy and very low surface roughness on an infeed grinding machine using a rotary table and a cup wheel. The circumferential run out, the radial profile error and the surface roughness Ra of the ground silicon carbide ring are measured to be 0.16 m, 0.15 m and 3 nm respectively.