Method for manufacturing heat resisting member applicable to an exhaust gas guide assembly with improved heat resistance for VGS turbocharger

Inactive Publication Date: 2009-06-11
OHISHI SHINJIRO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0066]A method for manufacturing a shaped material for an adjustable blade applicable to an exhaust gas guide assembly for a VGS turbocharger the adjustable blade including a shaft portion serving as a center of rotation and a blade portion for substantially adjusting the flow rate of exhaust gas, the adjustable blade being incorporated in the VGS turbocharger. The flow of the exhaust gas at a low flow rate discharged from an engine is suitably throttled to increase the velocity of the exhaust gas so that an exhaust turbine is rotated by energy of the exhaust gas and a compressor directly coupled to the exhaust turbine wheel feeds more air into the engine than fed into it by natural suction, whereby a high output power is obtained at low rotational speeds. In manufacturing an adjustable blade, a step of obtaining a shaped material including a blade portion and a shaft portion as a starting form for the adjustable blade is conducted by metal injection molding in which a metal powder having plasticity imparted thereto is injected into a mold and solidified. In the injection molding, sintering is carried out so as to uniformly form minute closed cells which are spheroidal pores between metal grains. Thereafter, the shaped material thus injection molded is subjected to a hot isostatic press treatment (HIP treatment) so as to increase the density of the shaped material.
[0067]According to the invention, the porosity of the metal material obtained by the metal injection molding can be reduced, so that and the strength of the shaped material can be increased. That is, the high porosity that is considered to be one of the disadvantages of the metal injection molding can be improved and the shaped material formed by the injection molding is made applicable practically. Furthermore, due to the reduction of

Problems solved by technology

The turbocharger, when the engine is running at a low rotational speed, can not avoid giving a slow-moving feeling caused by the reduced flow rate of the exhaust gas and continued until the exhaust turbine runs efficiently, and necessitating a subsequent time or a so-called turbo-lag before the turbine rapidly reaches the full-running state.
Furthermore, in the case of a diesel engine which runs inherently at low rotational speeds, there is a disadvantage that it is diff

Method used

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  • Method for manufacturing heat resisting member applicable to an exhaust gas guide assembly with improved heat resistance for VGS turbocharger
  • Method for manufacturing heat resisting member applicable to an exhaust gas guide assembly with improved heat resistance for VGS turbocharger
  • Method for manufacturing heat resisting member applicable to an exhaust gas guide assembly with improved heat resistance for VGS turbocharger

Examples

Experimental program
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Example

Embodiment 1

[0086]Embodiment 1 is an embodiment in which the presence of nonmetallic matter present in a heat resisting metal member is decreased and the size of nonmetallic matter is reduced. For this purpose, a method or process, such as calcium injection, a heating pressurization treatment, a pure oxygen blowing refining treatment or the like, is applied to the heat resisting metal member. More specifically, the manufacturing procedure is as follows.

(i) Decrease of Nonmetallic Inclusions in the Heat Resisting Metal Member

[0087]Calcium injection during a refining process decreases generation of nonmetallic inclusions, i.e. oxides (type B and type C inclusions) as well as sulfides (type A inclusions) by discharging sulfur, silicon, aluminum and the like as calcium compounds. Furthermore, by a pure oxygen blowing refining treatment, nonmetallic inclusions of type B and type C are decreased by discharging oxides as slag.

(ii) Reduction of the Size of Nonmetallic Inclusions in the Heat...

Example

Embodiment 2

[0091]Embodiment 2 is an embodiment in which the heat resisting member (alloy) is manufactured according to the common procedure. Three examples embodied are shown in Table 1.

[0092]The reason for limiting the amount of each component in the alloy is as follows.

[0093]C of not more than 0.05% is to reduce sensitization susceptibility.

[0094]Mn of not less than 1% is to delay generation of a σ phase.

[0095]Ni of not less than 15% is to increase free energy for generating the σ phase.

[0096]Cr of not more than 30% is to increase free energy for generating the σ phase.

[0097]Ti of not less than 0.1% is to generate a γ′ phase.

[0098]Al of not less than 0.1% is to generate the γ′ phase.

[0099]Ce or La of not less than 0.05% is to suppress generation of an α phase.

(i) Manufacture of the Exhaust Gas Guide Assembly

[0100]A basic material is manufactured by executing to it predetermined control of the above ingredients in the purifying process in a converter, thereafter, through the ordin...

Example

Embodiment 3

[0106]Embodiment 3 is an embodiment and the alloy of this embodiment is manufactured according to the common procedure. Three examples embodied are shown in Table 4.

[0107]The reason for limiting the amount of each component in the alloy is as follows.

[0108]W of not less than 0.3% is to cause tempering secondary hardening to occur effectively and at a high temperature.

[0109]V of not less than 1.0% is to cause tempering secondary hardening to occur effectively and at a high temperature.

[0110]Mo of not less than 1.0% is to cause tempering secondary hardening to occur effectively and at a high temperature.

[0111]Hf of not less than 0.5% is to cause tempering secondary hardening to occur effectively and at a high temperature.

(i) Manufacture of the Exhaust Gas Guide Assembly

[0112]A stainless steel raw material is manufactured by controlling the composition in a refining process in a converter and further improving the accuracy of the composition in a secondary refining process,...

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Abstract

An exhaust gas guide assembly with an improved high-temperature wear resistance, oxidation resistance, high-temperature strength or the like for a VGS turbocharger is provided. According to the invention, the exhaust gas guide assembly for a VGS turbocharger includes adjustable blades, a turbine frame and an adjusting mechanism is characterized in that a heat resisting member constitutes the exhaust gas guide assembly to remarkably enhance high-temperature durability or the like of the exhaust gas guide assembly.

Description

[0001]This is a Continuation application of application Ser. No. 10 / 476,789, filed May 14, 2004, which is a National Stage of PCT / JP02 / 04552, filed May 10, 2002, the contents of which are incorporated herein in their entirety.TECHNICAL FIELD[0002]The present invention relates generally to a turbocharger for use in an automobile engine or the like, and more particularly to an exhaust gas guide assembly incorporated therein and an adjustable blade that is a component thereof.BACKGROUND ART[0003]A turbocharger is known as a supercharger used as means for improving the power output and the performance of an automobile engine. The turbocharger is an apparatus in which a turbine is driven by the exhaust energy of the engine to rotate a compressor with the power of the turbine, whereby the engine is supercharged to have more air fed into it than fed into it by natural suction. The turbocharger, when the engine is running at a low rotational speed, can not avoid giving a slow-moving feeling...

Claims

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Application Information

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IPC IPC(8): C23C8/66C22C38/00C22C38/58F01D5/28F01D17/16F02B37/24F02C6/12
CPCC22C38/04F05D2230/22F05D2220/40Y02T10/144F02C6/12F02B37/24F01D17/165F01D5/28C23C8/80B22F3/225B22F2998/00B22F2998/10B22F2999/00C22C38/001C22C38/002C22C38/005C22C38/02Y10T29/49316C22C38/06C22C38/22C22C38/24C22C38/40C22C38/50C22C38/58C22C38/60C23C8/22C23C8/38C22C33/0285B22F9/082B22F3/10B22F1/0048Y02T10/12B22F1/065F02B39/00
Inventor OHISHI, SHINJIROTAKAHASHI, YUKIO
Owner OHISHI SHINJIRO
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