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Exhaust stem for two-stroke crosshead

A technology of exhaust valve stem and crosshead type, which is applied in the direction of lifting valve, valve device, mechanical equipment, etc., can solve the problems of unfitness, time-consuming HIP treatment, etc., and achieve the effect of a solid microstructure

Active Publication Date: 2015-09-02
MAN DIESEL & TURBO FILIAL AF MAN DIESEL & TURBO SE TYSKLAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] HIP processing is known to provide high quality microstructure and finely adhered external surfaces, but HIP processing is very time consuming, and long processing times at high temperatures also result in unsuitable metallurgical processing: e.g. from one alloy to the other Component Diffusion

Method used

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  • Exhaust stem for two-stroke crosshead
  • Exhaust stem for two-stroke crosshead
  • Exhaust stem for two-stroke crosshead

Examples

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Embodiment Construction

[0037] in figure 1 with Picture 10 In the sample, the sample is taken out of the HIP compressed particulate material, and the circular shape of the cut through the particulate can be seen. This shows that the particles retain their spherical shape during compression. The typical sign of HIP compression is that the particles are spherical, and this is the result of applying isostatic pressure during the compression process. The isostatic pressure causes the particulate material to shrink in such a way that the particles do not move around the inside of the material during processing. This is a very orderly process in which the mutual position of the particles is maintained. In order to understand the microstructure of the prior art more clearly, three circles were added to Picture 10 In the picture in order to draw the outline of the three particles in the picture.

[0038] figure 2 The schematic structure of the exhaust valve stem 1 of the exhaust valve for a two-stroke cros...

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Abstract

An exhaust valve spindle (1) for an internal combustion engine, particularly a two-stroke crosshead engine, which exhaust valve spindle comprises a valve head (3) with a base portion (4) of an alloyed steel, and an outer facing (5) forming the surface of the valve spindle towards a combustion chamber. The outer facing (5) has been formed from particulate starting material of a hot-corrosion-resistant alloy being nickel-based, chromium- based or cobalt-based, where said particulate starting material has been united to a coherent layer. At least at the transition zone to the base portion (4) the particles in the particulate material of the outer facing (5) have been deformed into oval or elongate shapes by shear strain caused by forging the outer facing and the base portion, and that the forged outer facing (5) has a density of at least 98.0 %.

Description

Technical field [0001] The present invention relates to an exhaust valve stem for an internal combustion engine, in particular, to an exhaust valve stem for a two-stroke crosshead engine, wherein the exhaust valve stem includes a valve head having a base part of alloy steel , And an outer surface forming the surface of the valve stem facing the combustion chamber, the outer surface being formed of a particulate starting material of a nickel-based, chromium-based or cobalt-based thermal corrosion resistant alloy, wherein the particulate starting material is bonded to Adhesive layer. Background technique [0002] U.S. Patent 6,173,702 describes this known exhaust valve stem, in which the corrosion-resistant outer surface is provided on the base part by powder metallurgy treatment, and the particulate material of the corrosion-resistant alloy is provided on the base part. The mold is bonded with the base part through HIP treatment (Hot Isostatic Pressure). The mold is evacuated to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01L3/04B22F3/17B21K1/24
CPCB21K1/22B21J5/002B22F3/15F01L3/04B22F5/008B22F7/08B21J5/06B22F3/17B22F3/14B21K1/24
Inventor 哈罗·安德烈亚斯·赫格
Owner MAN DIESEL & TURBO FILIAL AF MAN DIESEL & TURBO SE TYSKLAND