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High-strength turbocharger spray nozzle ring blade and preparation method thereof

A turbocharger and nozzle ring technology, which is applied in the fields of high-strength turbocharger nozzle ring blades and their preparation, high-strength HK30 stainless steel and its preparation fields, can solve the problems of low strength and difficulty in meeting the high temperature requirements of nozzle ring blades, etc.

Active Publication Date: 2019-03-26
湖南英捷高科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the commonly used material for nozzle ring blades is HK30 stainless steel, which is austenitic stainless steel with low strength. The sintered hardness is 190HV, and the high temperature strength at 800°C is 170MPa. Therefore, conventional HK30 has been difficult to meet the high temperature requirements of nozzle ring blades.

Method used

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  • High-strength turbocharger spray nozzle ring blade and preparation method thereof
  • High-strength turbocharger spray nozzle ring blade and preparation method thereof
  • High-strength turbocharger spray nozzle ring blade and preparation method thereof

Examples

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Effect test

Embodiment 1

[0043] High-strength turbocharger nozzle ring blades, the process is as follows:

[0044] Raw material preparation: The powder raw material used in the present invention is HK30 aerosolized powder provided by Osprey Company of the United Kingdom, and 1.5% CrN is added by weight percentage, and the CrN particle size is 5-20 microns;

[0045] Feed preparation: According to the mass ratio of 95%: 5%, the weighed (HK30+CrN) powder is mixed with the binder, the mixing temperature is 170°C, the speed of the mixer is 70r / min, The refining time is 3 hours, and it is made into feed after cooling and crushing;

[0046] Injection molding: put the prepared feed into the injection molding machine, the injection temperature is 175°C, the injection pressure is 120MPa, the mold temperature is 60°C, and the blank is formed by injection;

[0047] Blank processing and pre-sintering: place the blank in methylene chloride, remove part of the binder (including paraffin) by solvent degreasing; then...

Embodiment 2

[0053] High-strength turbocharger nozzle ring blades, the process is as follows:

[0054] Raw material preparation: The powder raw material used in the present invention is HK30 aerosolized powder provided by Osprey Company of the United Kingdom, and 1.0% CrN is added by weight percentage, and the CrN particle size is 5-20 microns;

[0055] Feed preparation: according to the mass ratio of 90%: 10%, the weighed (HK30+CrN) powder is mixed with the binder, the mixing temperature is 150°C, the speed of the mixer is 65r / min, The refining time is 2.8 hours, and it is made into feed after cooling and crushing;

[0056] Injection molding: put the prepared feed into the injection molding machine, injection temperature is 160°C, injection pressure is 100MPa, mold temperature is 50°C, and the blank is formed by injection molding;

[0057] Blank processing and pre-sintering: place the blank in dichloromethane, remove part of the binder (including paraffin) by solvent degreasing; then the...

Embodiment 3

[0060] High-strength turbocharger nozzle ring blades, the process is as follows:

[0061] Raw material preparation: The powder raw material used in the present invention is HK30 aerosolized powder provided by Osprey Company of the United Kingdom, and 0.5% CrN is added by weight percentage, and the CrN particle size is 5-20 microns;

[0062] Feed preparation: According to the ratio of 85% by mass: 15%, weigh HK30, CrN powder and binder for mixing. The mixing temperature is 150°C, the speed of the mixer is 60r / min, and the mixing time is 2.5h, after cooling and crushing, make feed;

[0063] Injection molding: put the prepared feed into the injection molding machine, injection temperature is 150°C, injection pressure is 80MPa, mold temperature is 40°C, and the blank is formed by injection;

[0064] Blank processing and pre-sintering: place the blank in methylene chloride, remove part of the binder (including paraffin) by solvent degreasing; then thermally degrease the dried blan...

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Abstract

The invention discloses a high-strength turbocharger spray nozzle ring blade and a preparation method thereof and belongs to the technical field of production of vehicle-purpose turbocharger spray nozzle ring blades. According to the high-strength turbocharger spray nozzle ring blade and the preparation method thereof, the method comprises the steps that HK30 stainless steel gas atomized powder and adhesive are adopted, wherein an enhancer accounting for 0.8-1.5 % of the weight of the stainless steel gas atomized powder is added into the HK30 stainless steel gas atomized powder; the HK30 and enhancer powder and the adhesive are weighed according to the mass ratio of (80-95)%:(20-5)% and are subjected to mixing, cooling and crushing, and then feed is prepared; the prepared feed is injectedinto an injection moulding machine, and a blank is injection moulded, wherein the injection temperature is 140-175 DEG C, the injection pressure is 60-120 MPa, and the mould temperature is 30-60 DEG C; and after the blank is subjected to solvent degreasing and heating degreasing combined treatment, treatment of presintering and sintering procedures is performed to obtain a finished product. The high-strength turbocharger spray nozzle ring blade provided by the invention is high in product size precision and surface precision, high in product thermal fatigue resistance, and long in product service life under high-temperature strength conditions.

Description

technical field [0001] The invention discloses a high-strength turbocharger nozzle ring blade and a preparation method thereof, in particular to a high-strength HK30 stainless steel and a preparation method thereof, and belongs to the technical field of production of vehicle turbocharger nozzle ring blades. Background technique [0002] The turbocharger can comprehensively improve the overall performance of the engine such as power, economy and emission indicators, inject strong power into the engine, and better meet the requirements of the new Euro III and Euro IV emission standards. Its main working principle is to change the cross-sectional size of the turbine nozzle by adjusting the angle of the turbine inlet guide vane, and then adjust the boost pressure. When the engine is in idling or low speed condition, the nozzle blades are closed or the nozzle section is very small, even at this time the low exhaust gas flow can accelerate the impeller quickly, thereby increasing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/22B22F5/00B22F1/00
CPCB22F3/225B22F5/00B22F2998/10B22F1/10B22F1/103B22F1/108B22F3/1007B22F3/1021
Inventor 李益民余勇何浩胡幼华
Owner 湖南英捷高科技有限责任公司
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