Machining method for complex surface of fluid dynamic pressure and static pressure combined mechanical seal ring for nuclear main pump

Abstract

The invention discloses a machining method for a complex surface of a fluid dynamic pressure and static pressure combined mechanical seal ring for a nuclear main pump, and belongs to the technical field of precision machining. The machining method is characterized in that: the sum of square of the diameter of a cup-shaped grinding wheel and the square of a middle diameter of an isoclinal wavelike surface of the seal ring is equal to the square of double the distance from an intersection point of an end face of the cup-shaped grinding wheel and a revolving axis of the cup-shaped grinding wheel to the revolving axis of a revolving table; an included angle of two revolving axes during grinding of the isoclinal wavelike surface is equal to a radial profile inclination angle of the isoclinal wavelike surface; the distance from the cup-shaped grinding wheel to the middle point of a grinding contact camber line of a seal ring is equal to the distance from the intersection point of the end face of the grinding wheel and the revolving axis of the grinding wheel to the revolving table; and when a sealed dam face is ground, the two revolving axes are parallel, micro feed plunge-cut grinding of constant grinding wheel cutting depth is performed through the end face of the grinding wheel. The machining method has the effect and the benefit that: machining of high surface accuracy and low surface roughness of the complex surface of the fluid dynamic pressure seal ring for the nuclear main pump, which is constituted by a flat cam face and the isoclinal wavelike surface with a radial profile of a slightly oblique straight line and with constant circumferential inclination angle, is realized.

Description

technical field [0001] The invention belongs to the technical field of complex shape surface processing of hydrodynamic and static pressure combined mechanical seal rings for nuclear main pumps, relates to the processing of mechanical seal rings, and particularly relates to a flat dam surface and a radial profile that are slightly inclined straight lines and whose inclination angle is along the An ultra-precision grinding method for the complex surface of the hydrodynamic and static pressure combined mechanical seal ring for nuclear main pumps composed of constant circumferentially constant equi-inclination corrugated surfaces. Background technique [0002] Shaft-sealed nuclear main pumps mostly use end-face mechanical seals that can withstand high pressure and heavy loads and have a long life to prevent leakage of radioactive coolant. The fluid dynamic and static pressure hybrid mechanical seal with equi-inclination corrugated surface on the outside of the end face of the m...

AI Technical Summary

Problems solved by technology

Since the equi-inclined corrugated surface is a free-form surface in space, it cannot be processed by traditional grinding methods. However, when multi-axis linkage CNC point contact grinding is used, the grinding wheel wears quickly and the shape retention is poor, so it is difficult to obtain satisfactory surface accuracy. ; Airbag polishing, magnetorheological polishing, ion beam polishing and other computer-controlled optical surface modification technologies can realize high-precision processing of optical curved surfaces, but the processing efficiency is low, and there are edge effects to varying degrees when processing ring parts. The intersection of the surface and the equi-inclination corrugated surface is a first-order differential discontinuity, and it is extremely difficult to accurately modify the shape

Images