Apparatus and method for manufacturing fluid bearing

Abstract

The present invention provides an equipment for making fluid-bearing and its method. Said method at least includes the following steps: providing cylindrical raw material and inner mould with several ribs on its surface, said ribs are projected outward from surface of said inner mould toward radial direction; placing said inner mould in the raw material, providing magnetic field generation unit around the exterior of said raw material and providing a power required for magnetic field generation unit by exterior; using magnetic field generation unit to produce non-contact external force to inward extrude the raw material toward its radial direction to make several ribs on the surface of inner mould form several groove on said raw material, and making demoulding movement.

Description

technical field [0001] The invention relates to a device and method for manufacturing a fluid bearing, in particular to a device for manufacturing a fluid bearing which uses electromagnetic forming to generate oil grooves on the wall of the shaft hole of the bearing, so that the bearing can produce oil film pressure and oil seal effect after operation and its methods. Background technique [0002] Bearing is a device used in rotating parts to support, bear load and reduce friction. Common bearings are ball bearings, but due to their problems of high rotational noise, insufficient precision, and difficulty in miniaturization, they are generally only used for large parts that do not require high precision. As for miniature parts, such as cooling fans of computer systems, optical drives and hard disk drives and other precision electronic devices, bearings with the characteristics of miniature, high precision, low rotational noise, low rotational friction and strong shock resis...

AI Technical Summary

Problems solved by technology

But at present, because the spindle motor is getting smaller and smaller, it is not easy to manufacture fluid bearings suitable for high-precision micro motors (the oil groove depth, width and concentricity of the shaft hole wall of the bearing are very strict).

If it is produced by precision turning in traditional cutting, it is easy to produce burrs and poor concentricity in the bearing oil groove, and the tool is difficult to manufacture and easy to wear.

Known technologies such as U.S. Patent No. 5,758,421 granted to Asada and U.S. Patent No. 5,265,334 granted to Lucier all use metal ball hard pressing to produce bearing fine grooves. This technology has three disadvantages: 1. Metal balls of the mold are in contact with the forming material The area is small, which is easy to cause the metal ball to wear quickly; 2. The metal ball is quite small, and the fixture design is not easy; 3. A precision positioning and control platform is required for rolling, so the production cost is high

U.S. Patent No. 6,074,098 granted to Asai uses plastic injection molding to manufacture bearings. Due to the use of forced ejection and demoulding, the precision of the shaft hole wall of the bearing is poor and the bearing itself is not wear-resistant.

As for the U.S. Patent US5,914,832 granted to Teshima to manufacture flat thrust bearings by chemical etching and the U.S. Patent US6,108,909 granted to Cheever to manufacture the spindle oil groove of the bearing by roll forming, both of them cannot be formed in the shaft hole of the bearing Hole wall, so cannot make

[0004] The above-mentioned manufacturing method not only cannot be mass-produced but also has high production cost

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