核主泵用流体动压密封环复杂形面超精密磨削

提出采用回转台带动密封环回转和杯形砂轮端面切入磨削来加工核主泵用流体动压密封环复杂形面新方法,其原理为选择适当的砂轮半径、砂轮俯仰角、砂轮侧偏角、砂轮与回转台中心距使磨削接触弧线是密封环波纹面上且以其内、外周边为边界的一条曲线的精确逼近,联动控制回转台转动和砂轮或回转台的同步跟随运动使磨削接触弧线一端点在波纹面外周边上进而通过磨削接触弧线扫掠运动形成高精度波纹面,在砂轮轴线与回转台轴线平行时磨削密封坝面。其实现策略是采用细粒度金刚石杯形砂轮做恒定切削深度微进给切入磨削。其优点是砂轮磨损对磨削精度没有影响,面形精度取决于回转台的回转运动和砂轮或回转台的同步跟随运动精度,能够实现核主泵用流体动压密封环复杂形面的高面形精度、低表面粗糙度加工。

Ultra-precision Grinding of the Complex Surfaces of Hydrodynamic Seal Rings Used in Reactor Coolant Pumps

A novel method for ultra-precision grinding the complex surfaces of the hydrodynamic seal rings used in reactor coolant pumps is proposed.It uses a rotary table and a cup wheel to perform an infeed grindingo.Its principle is that the grinding contact arc is an approximation to the curve on the wavy surface bounded by its inner and outer peripheries if select suitable wheel radius,wheel pitch angle,wheel roll angle and the center distance between the wheel and the rotary table and the trajectory of the grinding contact arc can form the wavy surface by numerically controlling the rotation of the rotary table and the synchronous periodic motion of the rotary table or the cup wheel,and the flat dam surface can be generated if the two rotational axes are parallel.Micro infeed grinding with constant wheel depth of cut is adopt so that the form accuracy of the mechanical face seal is independent of the cup wheel wear but mainly depends on the motion accuracy of the rotary table and the cup wheel and the synchronous motion accuracy of the cup wheel.It is expected to be an efficient method to manufacture the complex surfaces of the hydrodynamic seal rings used in reactor coolant pumps with extremely high form accuracy and low surface roughness.