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Engine valve

An engine valve and valve technology, applied in the directions of engine components, machines/engines, mechanical equipment, etc., can solve the problems of poor processability and expensive materials, and achieve the effect of suppressing the reduction of impact resistance and wear resistance.

Active Publication Date: 2015-09-16
NITTAN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this regard, although the cobalt-based wear-resistant alloy, namely the brand name Tribaloy T400, is used for natural gas in severe wear environments as the surface-cured alloy of the surface, the material cost is expensive and the workability is poor, so it has become the preferred choice in valve manufacturing. difficulty

Method used

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Embodiment approach

[0063] In the alloy of the present invention, the base Ni, W, Mo, Fe, Cr, and B as additive components, and Co, Mn, Cu, C, and Si added as needed can be carried out in such a manner that each of them reaches a predetermined mass %. The adjusted and compounded green body is heated and melted in the crucible in the melting furnace to make a liquid alloy, and then it is made into a powder by atomization method, melting pulverization method, or cast in a prescribed mold to form a rod, Plate shape, used as surfacing material.

[0064] Especially the alloy of the present invention manufactured by the atomization method is adjusted to be suitable for the particle size of the purpose construction method, and in the surface modification constructions such as PTA weld seam uplift, spraying, the weld seam uplift welding rod manufactured by the continuous casting method can Applied to surface modification construction such as gas weld seam uplift. In addition, by applying the powder or r...

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Abstract

[Problem] To provide an engine valve which satisfies predetermined characteristics with respect to impact resistance, abrasion resistance and high-temperature corrosion resistance all of which meet or exceed predetermined levels required to resist severe use environments, while also minimizing the content ratios of predetermined rare metals. [Means for Solving the Problem] An engine valve is configured to include an engine valve base body having a stem portion and a head portion provided at one end portion of the stem portion, which engine valve comprises: a build-up portion formed by seat welding to encircle the head portion; and a seat obtained by forming a surface-hardened layer on the build-up portion, wherein the build-up portion is formed of a seat weld material constituted of a Ni-Fe-Cr alloy containing W at 8.0 to 40.0 mass %, Mo at a total together with W in a range of 20.0 to 40.0 mass %, Fe at 20.0 to 50.0 mass %, Cr at 12.0 to 36.0 mass %, B at 1.0 to 2.5 mass %, and a balance of Ni and inevitable impurities, and wherein the surface-hardened layer is formed by effecting nitriding treatment on the entire valve to form a nitride layer on a machined surface formed on the seat, thereby ensuring predetermined characteristic while minimizing rare metal content ratio.

Description

technical field [0001] The present invention relates to an engine valve formed with a surface using overlay welding (gold plating). Background technique [0002] In a dry combustion environment such as natural gas, combustion residues are not easily formed on the surface of the engine valve, so metal contact occurs between it and the valve seat, and severe adhesive wear occurs on the surface. In this regard, although a cobalt-based wear-resistant alloy, namely the brand name Tribaloy T400, is used as a surface-cured alloy for natural gas in a severe wear environment, the material cost is expensive and the workability is poor. difficulty. [0003] In order to reduce the cost of such a durable engine valve in a dry combustion environment, various technical solutions have been proposed, especially the technical solution shown in Patent Document 1, where the overlay welding of an iron-based alloy with a specific composition The surface hardened layer is formed by nitriding tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L3/02C23C8/48
CPCC23C8/48C23C8/28F01L3/02F16K25/005C23C8/56F01L3/04C23C8/24F01L2800/18C23C8/36F01L2103/00F01L2820/01F01L2101/00C22C30/00C22C38/08C22C38/18C22C19/056C22C19/07C22C27/04F01L2301/00F01L2303/00
Inventor 横山尚永饭尾将波
Owner NITTAN CORP
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