Sliding part and its manufacturing method

Abstract

There is provided a sliding part in which a surface coverage ratio of copper in the sliding part increases. A bearing which is the sliding part is formed by filling the raw powder into the filling portion of the forming mold, compacting the raw powder to form a powder compact 6, and sintering the powder compact 6. A copper-based raw powder is composed of a copper-based flat raw powder 2 having an average diameter smaller than that of an iron-based raw powder 1 and an aspect ratio larger than that of the iron-based raw powder 1, and a copper-based small-sized raw powder 3 having the average diameter is smaller than that of the copper-based flat raw powder 2. The copper is allowed to segregate at the surface of the sliding part. In the bearing in which the copper-based flat powder 2 segregates at the surface, the surface is covered with the copper-based small-sized raw powder 3 that has emerged on the surface, as well as the copper-based flat raw powder 2, thereby it is possible to increase the surface coverage ratio of copper.

Description

technical field [0001] The present invention relates to a sliding member such as a bearing and a manufacturing method thereof. Background technique [0002] As a sliding part that can reduce frictional resistance, improve durability, and prevent noise, it is known that iron-based and copper-based raw material powders are filled in the filling part of a molding die, while vibration is applied, and the raw material powders are subjected to vibration. Pressing to form a compact and then sintering the compact, wherein the copper-based raw material powder is a flat powder with a larger aspect ratio than the iron-based raw material powder, and is segregated on the surface side Copper (for example, Patent Document 1); by filling iron-based and copper-based raw material powders in the filling portion of a molding die, while applying vibration, and pressurizing the raw material powders to form compacts, and then the compacts A sliding part formed by sintering, wherein the copper-ba...

AI Technical Summary

Problems solved by technology

[0005] However, in the former and the latter prior art, by mixing the iron-based raw material powder and the iron-based raw material powder with a larger aspect ratio than the The mixed powder of copper-based flat raw material powder composed of flat powder is filled in the filling part of the molding die, and at the same time, vibration is applied to make the copper-based flat raw material powder segregate outside the filling part, so that the copper-based flat raw material powder is in the direction of thickness. overlapped on each other, and the direction crossing the thickness coincides with the longitudinal direction of the surface side, concentrated and segregated on the surface side, however, on the surface, not only the segregated copper-based flat raw material powder is exposed, but also exposed in a part of it. Iron-based raw material powder is formed, so gaps are formed between adjacent copper-based flat raw material powders exposed on the surface, as a result, gaps between copper-based raw material powders and iron-based raw material powders are formed on the surface, and copper-based raw material powders are formed on the surface. A gap between the flat raw material powders that prevents the surface copper coverage of the sliding part from being improved

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