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An exhaust valve spindle for an internal combustion engine, and a method of manufacturing

An exhaust valve stem, internal combustion engine technology, applied in the direction of lift valve, valve device, mechanical equipment, etc., can solve the problems of incompatibility, time-consuming HIP processing, etc., and achieve the effect of solid microstructure

Active Publication Date: 2015-12-09
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

[0006] 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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  • An exhaust valve spindle for an internal combustion engine, and a method of manufacturing
  • An exhaust valve spindle for an internal combustion engine, and a method of manufacturing
  • An exhaust valve spindle for an internal combustion engine, and a method of manufacturing

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Experimental program
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Embodiment Construction

[0038] exist figure 1 and Figure 10 , the sample is removed from the HIP compacted particulate material, and the annular shape cut through the particulate can be seen. This shows that the particles retain their spherical shape during compression. A typical sign of HIP compression is that the particles are spherical and this is a result of the isostatic pressure applied during the compression. This isostatic pressure causes the particulate material to shrink in such a way that the particles do not move around the interior of the material during processing. This is a very orderly process where the mutual position among the particles is maintained. For a clearer understanding of the microstructure of the prior art, three circles are added to Figure 10 in the picture in order to draw the outlines of the three particles represented in the picture.

[0039] figure 2 A schematic structure of an exhaust valve stem 1 for an exhaust valve of a two-stroke crosshead engine is sho...

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PUM

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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

[0001] This application is a divisional application of a patent application (international filing date October 29, 2010, application number 201080048506.X, title of invention is "exhaust valve rod for internal combustion engine and its manufacturing method"). technical field [0002] 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 comprises a valve head having a base portion of alloy steel , and an outer surface forming the surface of the valve stem facing the combustion chamber, the outer surface is formed of a particulate starting material that is a nickel-based, chromium-based or cobalt-based hot corrosion resistant alloy, wherein the particulate starting material is bonded to Adhesive layer. Background technique [0003] U.S. Patent 6,173,702 describes such a known exhaust valve stem in which the corrosion-resistant outer sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/08B22F3/115B22F3/17F01L3/04
CPCB22F7/08B21J5/002B21J5/06B21K1/22B22F3/15B22F5/008F01L3/04B22F3/17B22F3/14B21K1/24
Inventor 哈罗·安德烈亚斯·赫格
Owner MAN DIESEL & TURBO FILIAL AF MAN DIESEL & TURBO SE TYSKLAND
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