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Near-net shaping method for charging turbine with hollow internal structure

A turbocharger and internal structure technology, applied in the field of powder injection molding, to achieve the effects of reducing degreasing defects, high dimensional accuracy, and avoiding non-metallic inclusions

Active Publication Date: 2013-08-14
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing a hollow turbocharger by injection molding technology, aiming to solve the problem of near-net forming of a turbocharger with a complex shape

Method used

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  • Near-net shaping method for charging turbine with hollow internal structure
  • Near-net shaping method for charging turbine with hollow internal structure
  • Near-net shaping method for charging turbine with hollow internal structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Using K213 alloy powder as raw material to prepare a turbine with a simple hollow structure

[0018] The argon atomized K213 alloy powder with a particle size of 2-20 μm is used as the raw material, and the weight percentage content of the alloy elements is: 35%Ni, 15%Cr, 1.8%Al, 3.5%Ti, 5%W, 0.08%B, 0.08%C and balance Fe. The weight percent content of each component in the binder is: 10% high-density polyethylene, 12% polystyrene, 13% polypropylene, 5% stearic acid and the rest paraffin. First, the atomized superalloy powder and the paraffin-based binder were mixed for 60 minutes in a double planetary mixer at 131 °C and a speed of 36 rpm to make a feed with uniform rheological properties. The powder loading was 63vol.%. The feed material is injection-molded on a CJ80-E injection molding machine with an injection temperature of 160°C and an injection pressure of 90MPa to obtain a turbine blank. The turbine blank is dissolved in trichlorethylene at 40°C ...

Embodiment 2

[0019] Example 2: Using K418 alloy powder as raw material to prepare a turbine with a simple hollow structure

[0020] The argon atomized K213 alloy powder with a particle size of 2-20 μm is used as the raw material, and the weight percentage of alloy elements is: 13%Cr, 6.0%Al, 0.8%Ti, 4.2%Mo, 2.3%Nb, 0.04%B, 0.09% Zr, 0.08% C and the balance Ni. The weight percent content of each component of the binder is: 12% high-density polyethylene, 10% polypropylene, 10-15% polystyrene, 8% stearic acid and the rest paraffin. Firstly, the mixed powder and the binder were mixed evenly, and then kneaded for 90 min on a double planetary mixer at 140 °C and a speed of 40 rpm to make a feed with uniform rheological properties, and the powder loading was 64 vol. %. The feed material is injection-molded on a CJ80-E injection molding machine with an injection temperature of 150°C and an injection pressure of 100MPa to obtain a turbine blank. The turbine body is dissolved in trichlorethylen...

Embodiment 3

[0021] Example 3: Using GH4169 alloy powder as raw material to prepare a turbine with a simple hollow structure

[0022]The argon atomized K213 alloy powder with a particle size of 2-20 μm is used as the raw material, and the weight percentage of alloying elements is: 0.027%C, 53.74%Ni, 17.58%Cr, 5.35%Nb, 3.01%Mo, 0.98%Ti, 0.52%Al, 0.0025%B, 0.009%Si, 0.40%Co, the rest is Fe. The weight percent content of each component of the binder is: 14% high-density polyethylene, 15% polypropylene, 11% polystyrene, 10% stearic acid and the balance paraffin. First, mix the mixed powder and binder evenly, then knead on a double planetary mixer at 149°C and a speed of 45 rpm for 120 minutes to make a feed with uniform rheological properties, and the powder loading is 65vol.%. ; The feed material is injection-molded on a CJ80-E injection molding machine, the injection temperature is 155°C, and the injection pressure is 110MPa; the turbine blank is dissolved in trichlorethylene for 6 hours,...

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Abstract

Disclosed is a near-net shaping method for a charging turbine with a hollow internal structure. Atomized high-temperature alloy powder and paraffin base binders are mixed to manufacture feedstock with a uniform rheological performance. As for a turbine with a simple hollow internal structure, the feedstock is directly formed on an injection forming machine to obtain a turbine blank with the hollow structure. As for as a turbine with a complicated hollow internal structure, firstly, polystyrene is formed into a mold core by injection, the shape of the mold core is as same as that of the internal structure, secondly, the mold core is embedded into a mold, a turbine blank with the mold core is obtained after injection forming, and thirdly, the mold core is completely dissolved after the turbine blank with the mold core is soaked in trichloroethane to obtain the turbine blank with the hollow structure. The turbine blank is sintered in vacuum after solvent degreasing and hot degreasing, the sintered blank is compacted by the aid of unjacketed hot isostatic pressure, and finally, the charging turbine with the hollow structure is obtained by the aid of solid solution and aging treatment. The problem of difficulty in near-net shaping of a charging turbine in a complicated shape is solved, the obtained turbine is almost fully compact and uniform in structure, and the comprehensive mechanical property of the turbine is superior to that of a cast turbine.

Description

technical field [0001] The invention belongs to the technical field of powder injection molding, and in particular provides a near-net molding method of a supercharging turbine with a hollow internal structure. Background technique [0002] The turbocharger is installed on the exhaust pipe of the vehicle engine. It uses the exhaust gas discharged from the engine cylinder to drive the turbine impeller to rotate. The turbine rotates to drive the coaxial compressor to work. The compressor impeller generates high-pressure and high-density air by accelerating the air. , increasing the intake air volume of the engine. The use of turbochargers can significantly reduce engine size and weight, improve fuel economy and reduce emissions. The turbine is the core component of the turbocharger. It is driven by high-temperature exhaust gas and requires good high-temperature mechanical properties, corrosion resistance and fatigue properties. At present, turbine impellers are mainly manufa...

Claims

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Application Information

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IPC IPC(8): B22F5/10B22F3/22
Inventor 章林李丹曲选辉秦明礼何新波
Owner UNIV OF SCI & TECH BEIJING
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