Dynamic pressure bearing production method

A technology for dynamic pressure bearings and manufacturing methods, applied to bearing components, shafts and bearings, mechanical equipment, etc., can solve the problems of difficult sharp formation, insufficient hardness of axial dynamic pressure concave parts, difficult formation, etc., and achieve high deformation Effect

Inactive Publication Date: 2006-05-03
HITACHI POWDERED METALS COMPANY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, in this case, a new problem arises that it is difficult to form the radial dynamic pressure recess on the radial surface by plastic working.
[0007] The density of sintered bearing raw material is usually 6.5Mg / m 3 On the other hand, it is easy to form radial dynamic pressure recesses at this density as described above, but it tends to be difficult to form sharp axial dynamic pressure recesses due to insufficient hardness. Ultrasonic processing produces a deformation in which the diameter of both ends of the shaft hole shrinks slightly
On the other hand, if the density of the raw material of the sintered bearing is too high, although the influence of ultrasonic machining is small and the deformation can be suppressed, it is difficult to form the radial dynamic pressure concave part because it is relatively hard.

Method used

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Embodiment

[0056] Next, examples of the present invention will be described to clarify the effects of the present invention.

[0057] Using a mixed powder of copper powder: 49% by mass, iron powder: 49% by mass, and tin powder: 2% by mass as the raw material powder, compression molding was performed by changing the molding pressure, and the obtained green compact was sintered to produce 8 kinds of densities ranging from 6.5 to 7.6Mg / m 3 sintered bearing raw materials. For these sintered bearing raw materials, using the method described in the above-mentioned embodiment, excluding the one used for comparison, the hole sealing treatment was performed on one end surface by ultrasonic machining, and then, the shape was formed on the one end surface. figure 2 The same separation grooves and arcuate surfaces as shown were used to obtain dynamic pressure bearings with sample numbers 1 to 8 shown in Table 1. In this case, sample No. 5 is a sample not subjected to ultrasonic processing.

[00...

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Abstract

The method for producing a dynamic pressure bearing according to the present invention is characterized in that the end surface of the cylindrical sintered bearing raw material whose density is adjusted to 6.6 to 7.4 Mg / m3 is subjected to ultrasonic processing to form the axial dynamic pressure concave portion, so that the end surface is larger than the above-mentioned Density is more dense, after that, an axial dynamic pressure recess is formed on the end face, and then a radial dynamic pressure recess is formed on the inner peripheral surface of the shaft hole of the sintered bearing raw material.

Description

technical field [0001] The present invention relates to a method for producing a dynamic pressure bearing capable of generating dynamic pressure in lubricating fluid such as lubricating oil to obtain high bearing rigidity, and particularly relates to a method for making sintered bearings with high dimensional accuracy and high precision as desired. The shape forms the manufacturing method of both the axial dynamic pressure concave part and the radial dynamic pressure concave part. The dynamic pressure bearing obtained in the present invention is suitable as a bearing for a spindle motor equipped with a recording disk drive device or the like. Background technique [0002] The above-mentioned spindle motor is widely used as a drive source in various information devices such as disk drives for driving magnetic disks or optical disks such as CDs and DVDs to read and write information on these disks. In addition, the above-mentioned spindle motor is also widely used as a drive ...

Claims

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Application Information

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IPC IPC(8): F16C33/14B22F7/02F16C33/10
Inventor 德岛秀和松村隆志近藤诚新居胜敏
Owner HITACHI POWDERED METALS COMPANY
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