Preparation method of high-reliability radial-flow supercharger turbine impeller

Abstract

The invention provides a preparation method of a high-reliability radial-flow supercharger turbine impeller. The preparation method comprises the steps of determining preparation process parameters ofa turbine impeller basis sample piece according to the structural parameters of the radial-flow supercharger turbine impeller; preparing the turbine impeller basis sample piece through a casting formation process; determining a re-manufacturing area of the turbine impeller and dimension parameters according to stress distribution characteristics and reliability index requirements of the turbine impeller during working; determining the parameters of a selective laser melting process or a friction stir welding process adopted for re-manufacturing of the turbine impeller in combination of material performance of the turbine impeller; and finally re-manufacturing the turbine impeller according to the selected turbine impeller re-manufacturing process and the parameters thereof, so that the strength performance and reliability of the turbine impeller are improved. By means of the preparation method, the reliability of the radial-flow supercharger turbine impeller can be remarkably improved, and engineering is easily achieved.

Description

technical field [0001] The invention belongs to the technical field of turbocharging, and in particular relates to a method for preparing a high-reliability radial turbocharger turbine impeller. Background technique [0002] The radial turbine impeller is one of the core components of the vehicle turbocharger, which is responsible for converting the energy of the exhaust gas discharged from the engine cylinder into the mechanical energy required for the work of the turbocharger compressor impeller. In the manufacturing process of the turbocharger turbine impeller, it is not only required to have a complete blade structure to meet the aerodynamic performance requirements of the turbocharger, but also have sufficient strength to meet the structural reliability requirements of the turbocharger. [0003] Affected by the structure complexity and manufacturing cost of turbocharger turbine impellers, at present, the preparation of automotive radial turbocharger turbine impellers ma...

AI Technical Summary

Problems solved by technology

For the radial turbocharger turbine impeller prepared by the centrifugal casting molding process, since the shell of the turbine impeller rotates at high speed along the central axis during the casting process, the forming quality of the turbine blade is high, but under the action of centrifugal force, the hub of the turbine impeller Insufficient filling of superalloy solution leads to coarse structure and low strength performance of this part

For the radial turbocharger turbine impeller prepared by the anti-gravity casting molding process, since the superalloy solution is injected into the shell from the back of the turbine impeller under a certain pressure during the casting process, the alloy structure of the turbine impeller hub is It is relatively dense and has good strength properties, but due to the joint influence of poor fluidity of the superalloy solution and the small flow space and long distance of the turbine impeller shell, the forming quality of the turbine impeller blade is poor

[0004] In order to solve the problems of poor airfoil quality and low strength of the hub existing in the preparation process of the radial turbocharger turbine impeller using the existing molding process, the present invention proposes a high-reliability radial turbocharger turbine impeller preparation method, which can While ensuring the forming quality of the turbine impeller blades of the radial turbocharger, the strength of the turbine impeller is significantly improved, thereby improving the reliability of the radial turbine impeller

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