Method for preparing blades of adjustable nozzle in use for turbocharger of engine by using powder as raw material

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

Inactive Publication Date: 2007-07-25
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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  • Method for preparing blades of adjustable nozzle in use for turbocharger of engine by using powder as raw material

Examples

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Embodiment 1

[0018] Carbonyl iron powder, ferrochromium powder, ferromolybdenum powder and ferrosilicon powder with average particle sizes of 3.5μm, 37μm, 35μm and 20μm, respectively, are mixed in a certain proportion to prepare a mixed powder of 78Fe20Cr1Si1Mo with the final alloy composition. The binder is 60wt% It is composed of PW, 15wt% HDPE, 15wt% PP and 10wt% SA, and the powder loading is 57vol%. The powder and the binder are mixed in a double planetary mixer at a temperature of 160 ° C and a rotation speed of 35 rpm for 60 minutes to obtain a uniform feed. ; The feeding 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, under the protection of decomposed ammonia atmosphere at a certain heating rate The temperature was raised to 350°C and 550°C, respectively, and the temperature was maintained for sufficient therma...

Embodiment 2

[0020] Gas-atomized pre-alloyed powder with an average particle size of 30 μm and an alloy composition of 78Fe20Cr1Si1Mo and a binder composed of 60wt% PW, 15wt% HDPE, 15wt% PP and 10wt% SA at a loading of 61vol% in a twin planetary mixer The uniform feed was obtained by mixing at a temperature of 155°C and a rotation speed of 30rpm for 40min; the feed was injection molded on a CJ80-E injection machine, the injection temperature was 155°C, the injection pressure was 100MPa, and the injection blank was in trichloroethane at 45°C Dissolving 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; -2 ~10 -3 Pa) sintered at 1350°C for 90min to obtain adjustable nozzle vanes for engine turbochargers with the required shape and precision. The density is 98%, the tensile strength is 490MPa, the elongation is 18%, and the oxidation rat...

Embodiment 3

[0022] The INCONNEL718 nickel-based superalloy powder (component composition: 19.2wt%Cr, 5.2wt%Nb, 2.9wt%Mo, 0.36wt%Al, 0.97wt%Ti, 19.7wt%Ti) prepared by the plasma rotating electrode method % Fe, residual Ni) and a binder composed of 60wt% PW, 15wt% HDPE, 15wt% PP and 10wt% SA at 65vol% loading in a twin planetary mixer at a temperature of 160°C and a rotation speed of 40rpm for 60min The uniform feed was obtained; the feed was injection-molded on a CJ80-E injection machine, the injection temperature was 165 °C, the injection pressure was 110 MPa, the injection blank was dissolved in trichloroethylene at 45 °C for 6 hours, and dried under the protection of a decomposed ammonia atmosphere. Heat up to 350 ℃ and 550 ℃ respectively at a certain heating rate for sufficient thermal degreasing; -2 ~10 -3 Pa) sintered at 1260° C. for 180 minutes to obtain adjustable nozzle vanes for engine turbochargers with the required shape and precision, with a density of 97.6%. Then it was tre...

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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 particularly provides an engine directly prepared by using powder as a raw material [0002] Turbocharger method with adjustable nozzle vanes. Background technique [0003] In recent years, in order to reduce the fuel consumption rate and exhaust gas emission rate, and improve the power performance and working reliability of diesel or gasoline engines, advanced adjustable nozzle turbochargers and technologies have been deeply studied, and the application range has been continuously expanded. Vanes are a key part of variable adjustment technology and superchargers. It is precisely by using the compressor outlet pressure to adjust the opening of the adjustable nozzle vanes, so that the intake flow can be continuously adjusted with the changes of the engine operating conditions during the working process of the turbocharger, and the intake air can be guaranteed under steady sta...

Claims

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Application Information

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Patent Type & Authority Applications(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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