Method for manufacturing hydrodynamic bearing and rotating shaft

Abstract

The invention provides a manufacturing method of dynamic pressure bearing, which comprises the following steps: an obturator is provided, the surface of the obturator is convexly provided with a plurality of protrusions; the obturator is arranged in the central position of a hollow bearing mould, and a hollow cavity in the bearing mould is filled with the mode of encapsulation molding to form an embryo of the dynamic pressure bearing; the obturator is removed from the embryo of the dynamic pressure bearing through the mode of catalytically degreasing; binder in the embryo of the dynamic pressure bearing is removed; the embryo of the dynamic pressure bearing is sintered; finally, the dynamic pressure bearing is formed. The dynamic pressure bearing integrally forms the dynamic pressure bearing and a dynamic pressure groove through the method of encapsulation molding, and removes micro-molecular gases which is decomposed from the obturator by using the method of catalytically degreasing, thereby preventing the embryo of dynamic pressure bearing from generating defects as deformation, bending or fracture, etc., improving the mass production capability and the dimensional precision of the dynamic pressure bearing. The invention also provides a manufacturing method of a dynamic pressure rotating shaft.

Description

technical field [0001] The invention relates to a bearing and a rotating shaft, in particular to a method for manufacturing the dynamic pressure bearing and the rotating shaft. Background technique [0002] At present, bearings are widely used in various equipment, especially dynamic pressure bearings are more commonly used in electronic devices, such as hard disk drives (HDD), compact disc drives (CD-ROM), digital video disc players (DVD), miniature discs Machine (MiniDisc), magneto-optical disk (MO) and cooling fans and other fields, the bearings of the motors in these devices are small in size, and the requirements for the rotation accuracy and life of the bearings are high. [0003] The dynamic pressure bearing forms a layer of fluid (gas or liquid) lubricating oil film in the tiny gap between the rotating shaft and the bearing. The lubricating fluid generates a dynamic pressure effect through the shear force of different cross-sectional areas, so that the dynamic pressu...

AI Technical Summary

Problems solved by technology

However, due to the miniaturization trend of the bearing, the inner diameter of the bearing is relatively reduced, and the lines of the dynamic pressure groove are finer, and the hollow part of the bearing is narrow, so it is very difficult to form the dynamic pressure groove, and it is difficult to improve the product quality. Mass production and stability

[0005] Chinese Patent Announcement No. CN1721717A discloses a combined dynamic pressure bearing device and its manufacturing method. In this manufacturing method, each bearing block is manufactured and formed separately, and it is easy to cause assembly tolerance and concentricity problems when each bearing block is combined. , it is difficult to guarantee the dimensional accuracy

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