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

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...

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