A method for preparing blades of adjustable nozzles used in a turbocharger of engines by using powders as the raw material

A turbocharger and nozzle blade technology, applied in the field of powder injection molding, can solve the problems of high cost, unevenness, composition segregation and structure, and achieve the effect of low cost, high precision, uniform composition and structure

Inactive Publication Date: 2009-03-04
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional preparation method of this kind of parts is "precision casting + machining", but because the materials used in parts generally contain many types and large contents of alloying elements, their components are prone to segregation and uneven structure, extremely poor plasticity, and poor processability. Its complex shape and thin wall make it more difficult to process, so its production efficiency is low, material utilization rate is low, cost is high, and it is difficult to mass produce

Method used

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  • A method for preparing blades of adjustable nozzles used in a turbocharger of engines by using powders as the raw material
  • A method for preparing blades of adjustable nozzles used in a turbocharger of engines by using powders as the raw material

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Effect test

Embodiment 1

[0017] Mix carbonyl iron powder, ferrochromium powder, ferromolybdenum powder and ferrosilicon powder with an average particle size of 3.5 μm, 37 μm, 35 μm and 20 μm respectively in a certain proportion to prepare the mixed powder of 78Fe20Cr1Si1Mo as the final alloy composition, and the binder consists of 60wt% Composed of PW, 15wt% HDPE, 15wt% PP and 10wt% SA, the powder loading is 57vol%, and the powder and binder are mixed in a double planetary mixer at a temperature of 160°C and a speed of 35rpm for 60min to obtain a uniform feed ; The feed material is injection-molded on a CJ80-E injection machine, the injection temperature is 160 °C, the injection pressure is 90 MPa, the injection blank is dissolved in trichloroethane at 45 °C for 4 hours, and after drying, it is heated at a certain rate under the protection of a decomposed ammonia atmosphere. Respectively raise the temperature to 350°C and 550°C and keep them warm for sufficient thermal degreasing; then place them in a ...

Embodiment 2

[0019] The average particle size is 30 μm, the alloy composition is 78Fe20Cr1Si1Mo gas atomized pre-alloyed powder and the binder composed of 60wt% PW, 15wt% HDPE, 15wt% PP and 10wt% SA is loaded in a double planetary mixer with a loading capacity of 61vol%. Mix at a temperature of 155°C and a speed of 30rpm for 40 minutes to obtain a uniform feed; the feed is injection-molded on a CJ80-E injection machine, the injection temperature is 155°C, the injection pressure is 100MPa, and the injection blank is placed in trichloroethane at 45°C Dissolution for 4 hours, after drying, under the protection of decomposed ammonia atmosphere, the temperature was raised to 350 ° C and 550 ° C at a certain heating rate respectively for sufficient thermal degreasing; then placed in a vacuum sintering furnace at a vacuum degree (vacuum degree 10 -2 ~10 -3 Pa) Sintering at 1350° C. for 90 minutes to obtain adjustable nozzle vanes for engine turbochargers with required shape and precision. Its de...

Embodiment 3

[0021] The INCONNEL718 nickel-based superalloy powder (composition is composed of: 19.2wt% Cr, 5.2wt% Nb, 2.9wt% Mo, 0.36wt% Al, 0.97wt% Ti, 19.7wt% %Fe, remaining Ni) and a binder composed of 60wt% PW, 15wt% HDPE, 15wt% PP and 10wt% SA were mixed in a double planetary mixer at a temperature of 160°C and a speed of 40rpm for 60min with a loading of 65vol%. Uniform feeding is obtained; the feeding is injection-molded on a CJ80-E injection machine, the injection temperature is 165 °C, the injection pressure is 110 MPa, the injection blank is dissolved in trichlorethylene at 45 °C for 6 hours, and dried under the protection of decomposed ammonia atmosphere Raise the temperature to 350°C and 550°C at a certain heating rate respectively for sufficient thermal degreasing; then place it in a vacuum sintering furnace at a vacuum degree (vacuum degree 10 -2 ~10 -3 Pa) sintered at 1260° C. for 180 minutes to obtain an adjustable nozzle vane for an engine turbocharger with the required ...

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Abstract

A process for preparing the blades of adjustable nozzle for the turbine booster of engine from raw powder includes proportionally mixing a chosen alloy pwoder with the adhesive prepared from paraffin wax, high-density polyethene, stearic acid and polypropene, pugging, injection molding at 150-175 deg.C under 75-125 MPa, degreasing and sintering.

Description

technical field [0001] The invention belongs to the technical field of powder injection molding, and in particular provides a method for directly preparing adjustable nozzle vanes for engine turbochargers by using powder as a raw material. Background technique [0002] In recent years, in order to reduce the fuel consumption rate and exhaust gas emission rate, improve the power performance and work reliability of diesel or gasoline engines, advanced adjustable nozzle turbochargers and technologies have been in-depth research, and the application range has been continuously expanded. Among them, the adjustable nozzle Vanes are a key part of variable regulation technology and superchargers. It is by using the outlet pressure of the compressor to adjust the opening of the adjustable nozzle vane that the intake flow can be continuously adjusted with the change of the engine working condition during the working process of the turbocharger, and the intake air flow in the steady st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F5/10B22F3/115B22F3/10
Inventor 段柏华曲选辉林冰涛汤春峰秦明礼何新波
Owner UNIV OF SCI & TECH BEIJING
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