Machining method for complex surfaces of liquid hybrid type mechanical seal rings

Abstract

A machining method for complex surfaces of liquid hybrid type mechanical seal rings belongs to the technical field of precision machining and is characterized in that a sum of the square of diameter of a cup wheel and the square of medium diameter of a sloped corrugate face is equal to a square of a doubled distance from an intersection of the end face of the wheel and a rotational axis of the wheel to a rotational axis of a rotary worktable, an inclination angle of the wheel is equal to a largest radial outline inclination angle of the sloped corrugate face, rotation of the rotary worktable, reciprocating swing of a swing worktable and periodic following are in linked control when the sloped corrugate face is ground, the end face of the wheel is used for constant micro-feed cut-in grinding in the cutting depth direction of the wheel, the rotary worktable is in constant-speed rotation when a seal dam face is ground, and the end face of the wheel is used for constant micro-speed cut-in grinding in the cutting depth direction of the wheel. The machining method has the advantages that machining high in surface shape precision and low in surface roughness for the complex surface of a hydrodynamic pressure seal ring is achieved, while the hydrodynamic pressure seal ring is composed of a flat circular dam face and a sloped corrugate face which has slight inclined linear radial outline and peripherally and periodically changing inclination.

Description

technical field [0001] The invention belongs to the technical field of complex surface processing of fluid dynamic and static pressure combined mechanical seal rings, and relates to the processing of mechanical seal rings, in particular to a flat circular ring dam surface and a radial profile that are slightly inclined straight lines with an inclination along the circumference. Ultra-precision grinding method for complex surface of hydrodynamic and static pressure combined mechanical seal ring composed of periodically changing oblique corrugated surface. Background technique [0002] Mechanical seals are widely used in rotating equipment such as pumps, compressors, reactors, agitators, centrifuges and filters that transfer liquids or gases. The development of modern industrial production has higher and higher requirements on the performance and life of mechanical seals working under conditions of high speed, high pressure and high temperature. In the early mechanical seals,...

AI Technical Summary

Problems solved by technology

Since the 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-shaped parts. The intersection with the oblique corrugated surface is a first-order differential discontinuity, and it is extremely difficult to accurately modify the shape; there is a problem of large surface roughness when laser processing is used

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