Four-axis coordinated grinding method for mechanical seal ring

Abstract

A four-axis coordinated grinding method for a mechanical seal ring belongs to the technical field of complex surface grinding, and is characterized in that a workpiece spindle, a cup wheel, a grinding wheel spindle, a swing workbench, an X-direction rectilinearly moving platform and a Z-direction rectilinearly moving platform are adopted, wherein the workpiece spindle is mounted on the Z-direction rectilinearly moving platform; the grinding wheel spindle is mounted on the swing workbench; the swing workbench is mounted on the X-direction rectilinearly moving platform; and cutting in grinding is conducted through a grinding wheel end surface. During the grinding of an inclined corrugated surface, the rotary movement of the workpiece spindle, the reciprocating swing of the swing workbench, the rectilinear motion of the X-direction rectilinearly moving platform, and the rectilinear motion of the Z-direction rectilinearly moving platform are controlled in a coordinated manner; and during the grinding of a seal dam surface, the rotary axis of the grinding wheel spindle and that of the workpiece spindle are parallel to each other. The method can be used for the high surface precision and low surface roughness processing of the complex surface of a fluid dynamic pressure seal ring comprising a flat ring-shaped dam surface and the inclined corrugated surface of which the radial outline is a slightly inclined straight line and the inclination angle changes periodically in the circumferential direction.

Description

technical field [0001] The invention belongs to the technical field of complex shape surface grinding, and relates to the grinding of mechanical seal rings, in particular to a kind of bevel whose flat circular dam surface and radial profile are slightly inclined straight lines and whose inclination angle changes periodically along the circumferential direction. An ultra-precision grinding method for complex-shaped surfaces of hydrodynamic and static-pressure combined mechanical seal rings composed of corrugated surfaces. 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, the two sealing end faces that fi...

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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