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Powder compact, sintered bearing, and process for producing the same

A technology of sintered bearings and manufacturing methods, applied in the direction of shafts and bearings, bearings, bearing components, etc., can solve the problems of reduced productivity, increased costs, increased manufacturing processes, etc., and achieve the effect of excellent adhesion

Inactive Publication Date: 2011-09-28
DIAMET CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, there is a problem that the manufacturing process is separately increased when machining the sintered alloy, resulting in a decrease in productivity and an increase in cost.

Method used

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  • Powder compact, sintered bearing, and process for producing the same
  • Powder compact, sintered bearing, and process for producing the same
  • Powder compact, sintered bearing, and process for producing the same

Examples

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Embodiment 1

[0067] Hereinafter, if the embodiments of the present invention are described, Figure 1 to Figure 6 Example 1 of the present invention is shown. As shown in the figure, a sintered bearing 1 is formed in a substantially cylindrical shape with a bearing hole 3 provided on a bearing main body 1 having pores (pores) inside and on the surface. ) is made of sintered alloy porous body, and a rotating shaft (not shown) having an outer diameter smaller than that of the bearing hole 3 is used to pass through the above-mentioned bearing hole 3 . In addition, fine irregularities 4 are provided on the inner peripheral surface of the bearing hole 3 , and a resin coating is provided on the irregularities 4 .

[0068] Next, an example of the manufacturing method of the above-mentioned sintered bearing 1 will be described. The sintered alloy 1 is formed by press-molding raw material powder M of Cu—Su—C-based, Fe-based, etc. to form a powder compact 1A, sintering it, and then correcting its s...

Embodiment 2

[0089] Figure 7 and Figure 8 Embodiment 2 of the present invention is shown, and the same reference numerals are assigned to the same parts as in the above-mentioned embodiment 1, and the detailed description thereof is omitted for description. In this example, the above-mentioned molding die 11 has no core except for the core rod 13. The configuration is the same as that of the first embodiment except for the rod-side concave-convex portion, and the green compact 1A without the concave-convex portion is formed by the molding die 11 . The above-mentioned concave-convex portion 4 is formed in the bearing hole 3 of the green compact 1A by means of a processing tool 21 . In addition, similarly to Example 1, the unevenness|corrugation part 4 was formed in the bearing hole 3 after shaping|molding of the green compact 1A, and before sintering.

[0090] The processing tool 21 has a substantially cylindrical rotating body 22 capable of being inserted into the above-mentioned beari...

Embodiment 3

[0100] Figure 9 Example 3 of the present invention is shown, and the same reference numerals are attached to the same parts as those of the above-mentioned embodiments, and detailed descriptions thereof are omitted. As a modified example of the portion, protrusions (not shown) having a substantially curved cross-section are provided around the outer periphery of the core rod 13 at predetermined intervals along the longitudinal direction. In addition, the aforementioned predetermined interval is 1 mm, and the width of the protrusion in the core rod longitudinal direction is about 300 μm, and the depth is about 10 μm to 40 μm, preferably about 10 to 20 μm.

[0101] Accordingly, on the bearing surface 3 of the green compact 1A to which the above-mentioned ridges have been transferred, fine concavo-convex portions 31 are formed, and the concavo-convex portions 31 form cross-sections at intervals K of approximately 1 mm along the longitudinal direction of the bearing hole 3 . It ...

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Abstract

A powder compact which gives a sintered bearing having excellent adhesion to a resinous coating layer; a sintered bearing obtained by sintering the powder compact; and processes for producing the compact and the bearing. A raw powder (M) is compacted between a molding core rod (13) having fine core-rod-side recesses and protrusions (18) on a peripheral surface thereof and a molding die (12) to form a powder compact (1A). Thus, the fine core-rod-side recesses and protrusions (18) are transferred to the bearing bore of the powder compact (1A). Namely, a powder compact (1A) having the fine recesses and protrusions can be produced. This powder compact (1A) is sintered to give a sintered bearing. A resinous coating layer is formed on the wall of the bearing bore having fine recesses and protrusions of this sintered bearing. Thus, a sintered bearing having excellent adhesion to the resinous coating layer can be produced.

Description

technical field [0001] The present invention relates to a powder compact and sintered bearing and a method of manufacturing the same. Background technique [0002] Such a sintered bearing is formed by compression-molding a raw material powder mainly composed of metal by a powder forming apparatus to form a powder compact, and sintering the powder compact in a sintering furnace to form a sintered body. [0003] Moreover, such a sintered bearing not only has stable quality and can be manufactured by mass production, but also has many advantages such as being able to use difficult-to-compose materials as molten materials, and being able to manufacture porous bodies. [0004] Utilizing such characteristics, it is possible to produce an oil-impregnated bearing that can seep out and absorb lubricating oil in the pores of the porous body from the surface (for example, Patent Document 1), and since the material powder contains fluorinated Dry bearings (dry friction bearings) that d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F5/00F16C33/14F16C33/20
CPCF16C33/201B22F2003/026B22F5/06F16C33/14F16C2220/20
Inventor 丸山恒夫原川俊郎田村佳树
Owner DIAMET CORP