Sliding member and production method therefor

A sliding member, manufacturing method technology, applied in the direction of anti-centrifugal rotating parts, bearing components, mechanical equipment, etc., can solve the problems of loss of lubrication, worry about durability, price increase, etc., achieve burn inhibition, reduce friction, and improve activity Effect

Inactive Publication Date: 2019-10-11
TOYOTA MOTOR EAST JAPAN +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] However, in the methods described in Patent Documents 1 to 6, a new process is required, and there is a problem that the man-hour increases or the price increases, and it cannot be implemented easily.
Furthermore, in the method described in Patent Document 1 or Patent Document 3, when the solid lubricant film wears out, the lubricating effect is lost, so there is also a problem that durability is concerned.

Method used

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  • Sliding member and production method therefor
  • Sliding member and production method therefor
  • Sliding member and production method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1、1-2

[0049] (Example 1-1, 1-2, Comparative Example 1-1, 1-2)

[0050] As Examples 1-1 and 1-2, disc-shaped test pieces made of bearing steel (SUJ2) were prepared, and wet shot blasting was performed using a shot material containing 15% by mass to 30% by mass of Cr. At this time, the surface roughness Ra was adjusted by changing the air pressure, and the surface roughness Ra of Example 1-1 was set to 0.15 μm, and the surface roughness Ra of Example 1-2 was set to 0.3 μm. A ball-on-disc friction test was performed on the shot-peened test piece in MoDTC lubricating oil containing 200 ppm of the Mo component. The counterpart material is bearing steel (SUJ2). The temperature of the lubricating oil was kept constant at 80° C., the load was 10 N, and the sliding speed was 0.5 m / s, and the friction coefficient after stabilization was measured.

[0051] As Comparative Examples 1-1 and 1-2, the same test pieces as in Examples 1-1 and 1-2 were prepared, except that the projection material w...

Embodiment 2

[0056] In the same manner as in Examples 1-1 and 1-2, the test piece was shot-peened, and the coefficient of friction was measured. At this time, the surface roughness Ra was adjusted by changing the conditions by changing the air pressure to 0.05 MPa to 0.5 MPa, and the relationship between the surface roughness Ra and the coefficient of friction was investigated. The result obtained is as Figure 6 shown. Such as Figure 6 As shown, it can be seen that it is preferable to set the surface roughness Ra within the range of 0.03 μm to 0.4 μm, and it is more preferable to set it within the range of 0.04 μm to 0.3 μm.

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Abstract

Provided are a sliding member capable of easily improving friction characteristics, and a production method therefor. In the sliding member (10), a sliding portion (11) is formed of a metallic material, and on a surface of the sliding portion (11), a Cr-containing modified layer (12) is formed by blasting a shot media containing Cr as a composition. The sliding member (10) slides under an environment of a lubricant containing Mo as an additive, in which active Cr exposed on the surface by sliding accelerates decomposition reaction of the additive contained in the lubricant to form a molybdenumdisulfide-containing film having low friction on the surface of the sliding portion (11).

Description

technical field [0001] The present invention relates to a sliding member having excellent friction characteristics and a method for producing the same. Background technique [0002] Sliding members such as gears used in automobiles require high fatigue strength. In particular, due to the demand for high output and downsizing of engines in recent years, the load acting on sliding members has increased, and further improvement in fatigue strength has been demanded. As a method of improving such fatigue strength, for example, a technique of hardening the surface by shot peening to generate high compressive residual stress is known. [0003] In addition, reduction of friction and improvement of wear resistance are also required in sliding members such as gears, and various methods for improving these characteristics have been conventionally reported. For example, Patent Document 1 describes a case where a hard modified layer is formed on the surface and a solid lubricant film ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C30/00
CPCC23C30/00C21D7/06F16C33/1025F16C33/106F16C2202/54F16C2204/10F16C33/125F16C2240/54F16C2223/08F16C33/121F16C33/043C10N2040/02
Inventor 小池亮真锅和干松原幸人小方雅淑
Owner TOYOTA MOTOR EAST JAPAN
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