核主泵用流体静压密封环圆锥面高精度磨削实现策略

针对核主泵用流体静压密封环圆锥面高精度磨削难题,建立了由杯形砂轮端面切人式磨削的数学模型,提出将磨削面形误差分解为倾角误差和锥度误差并以此求解俯仰角和侧偏角取值范围的实现策略.以1个氦光带作为面形误差的评价指标时,发现俯仰角和侧偏角可在较大范围内取值,先粗略设定俯仰角和侧偏角中的任意一个,再精确调整另一倾角就能实现密封环圆锥面的高精度磨削,并且侧偏角比俯仰角对面形误差的影响更为敏感,先调整侧偏角再调整俯仰角有利于降低调整难度和提高调整精度.采用该磨削实现策略,选择两组不同的俯仰角和侧偏角加工密封环圆锥面,测量结果表明面形误差和表面粗糙度均在设计要求范围内.

Implementation Strategy for High Accuracy Grinding of Conical Surfaces of Hydrostatic Seal Rings Used in Reactor Coolant Pumps

Aiming at solving the difficulties in grinding the high accuracy conical surfaces of the hydrostatic seal rings used in the reactor coolant pumps, a mathmatical model of grinding with the end face of a cup wheel was established and an implementation strategy of dividing the form error into two parts named the inclined angle error and taper error was proposed to calculate the value range of the pitch angle and the tilt angle. Taking one helium light band as the evaluation criteria, it is found that the values of the pitch angle and tilt angle could be selected in a large range and high accuracy grinding of the conical surfaces could be achieved by coarse adjustment for one of the angles and accurate adjustment for the other one. Since the tilt angle was more sensitive to the form accuracy than the pitch angle, the adjustment difficulty could be reduced and the adjustment accuracy could be improved when the tilt angle was adjusted at first. Two groups of the pitch angle and tilt angle were chosen in the proposed implementation strategy to grind the conical surfaces of the seal rings and the measurement results indicate that the form error and the surface roughness fulfilled the designed accuracy requirements.