Patent ID: 6905617
Filing Date: 2005-06-14
Classification: C23F,F16C,Y10T

Abstract:
1. An etching method for making fluid bearings, comprising the steps of: providing a bearing cast, which has a cylindrical hollow wall surface; providing an ejection axis, which is aligned with the bearing cast, extends into and attaches on the cylindrical hollow wall surface, the ejection axis being formed with a plurality of protruding grooves at positions corresponding to a plurality of oil grooves to be formed on the cylindrical hollow wall surface and the plurality of protruding grooves being tightly attached on the cylindrical hollow wall surface; filling a mobile protection material into gaps between the protruding grooves; solidifying the protection material on the cylindrical hollow wall surface to form a plurality of protection patterns; pulling the ejection axis out of the bearing cast, separating the ejection axis from the plurality of protection patterns on the cylindrical hollow wall surface; immersing the bearing cast in an etching solution so that parts of the bearing cast not covered by the protection patterns are etched to form the plurality of oil grooves; washing away the etching solution; and removing the plurality of protection patterns.