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Piston ring and manufacturing method therefor

A manufacturing method and technology of piston rings, which are applied in the direction of piston rings, coating of superimposed layers, machines/engines, etc., can solve problems such as difficult nitriding, achieve excellent wear resistance, maintain fatigue strength, and suppress side wear Effect

Active Publication Date: 2018-01-26
RIKEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this regard, martensitic stainless steels rich in nitride-forming elements (for example, SUS440B (17% Cr-based) and SUS420J2 (13% Cr-based)) that easily form a nitride layer are conveniently used, but Low-alloy steel such as steel also has the incidental problem that it is difficult to perform sufficient nitriding

Method used

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  • Piston ring and manufacturing method therefor
  • Piston ring and manufacturing method therefor
  • Piston ring and manufacturing method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and comparative example 1～2

[0045] The material composition is C: 0.52%, Si: 0.27%, Mn: 0.81%, Cr: 0.95%, V: 0.18%, and the balance is Fe and unavoidable impurities in a 10kg vacuum induction melting furnace. For smelting. A wire-shaped raw material with a diameter of 10 mmφ was produced by thermal processing, and wire drawing was further performed to finally prepare a wire rod having a rectangular cross-sectional shape with a thickness of 2.3 mm and a width of 1.0 mm. Here, an annealing step at 700° C. for 60 minutes was interposed during the wire drawing step. In addition, the oil tempering treatment was set as a treatment consisting of heating at 930° C. for 45 seconds, oil quenching at 60° C., and tempering at 470° C. for 60 seconds. 150 pressure rings with a nominal diameter of 73mmφ were formed from the above-mentioned wire rods, and stress relief heat treatment was performed at 450°C for 60 minutes. Furthermore, a CrN coating was formed on the outer peripheral surface by ion plating.

[0046] F...

Embodiment 2～3 and comparative example 3

[0058]Except that the total acidity of the chemical conversion treatment of the zinc calcium phosphate system was changed between 40 and 60 points, the same operation was performed as in Example 1 to produce Examples 2 to 3 (the total acidity was 40 points and 50 points, respectively) And the pressure ring of Comparative Example 3 (total acidity 60 points).

Embodiment 4～5 and comparative example 4

[0060] Except that the chemical conversion treatment is changed to manganese phosphate system and total acidity is changed between 5~35 points respectively, operate in the same way as Example 1 to make Examples 4~5 (total acidity is respectively 35 points, 20 points ) and the pressure ring of Comparative Example 4 (total acidity is 10 points).

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Abstract

The purpose of the present invention is to provide: a piston ring with which aluminum adhesion can be prevented over long periods even when used in a high temperature, high pressure environment and which exhibits excellent side surface abrasion resistance; and a manufacturing method therefor. By forming a nitride layer on the upper and / or lower side surface of the piston ring and then applying a phosphate chemical conversion treatment, the nitride layer is made to comprise granular and / or worm-shaped surface forms.

Description

technical field [0001] The present invention relates to a piston ring for an internal combustion engine, and more particularly to a piston ring having excellent wear resistance on the side surface of the piston ring and a method for producing the same. Background technique [0002] In internal combustion engines, technical improvements such as higher output, higher durability, and improved fuel efficiency are required. The temperature and pressure inside the engine will increase as a result of the technological improvement measures for higher output. In particular, for a top ring used in a high-temperature, high-pressure environment, not only the wear resistance of the outer peripheral sliding surface is required, but also the improvement of the wear resistance of the side surface is strongly required. [0003] The wear resistance of the piston ring flank is closely related to the adhesion of aluminum caused by the combination with the aluminum piston. In Patent Document 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J9/26F02F5/00
CPCF02F5/00F16J9/26C23C8/38C23C8/50C23C22/22C23C8/26C23C8/80C23C28/04C22C21/02C22C38/001C22C38/002C22C38/02C22C38/04C23C22/78C23C30/00F02F1/20F16J9/22
Inventor 岛祐司
Owner RIKEN CO LTD
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