Technology method for connecting three-body structure of titanium aluminum alloy turbine rotation shaft

Abstract

The invention relates to a technology method for connecting a three-body structure of a titanium aluminum alloy turbine rotation shaft, belonging to the technical field of mechanical processing technology design. The three-body structure of the titanium aluminum alloy turbine rotation shaft comprises a titanium aluminum alloy turbine impeller, a K418 high-temperature alloy transition sleeve and a 42 CrMo alloy steel shaft, wherein the K418 high-temperature alloy transition sleeve and the 42 CrMo alloy steel shaft rub through end surfaces and welded with each other, and then the K418 high-temperature alloy transition sleeve and the titanium aluminum alloy turbine rotation shaft are connected with each other through the interference fit of outside diameters and inside diameters. The invention has simple technology and stable and reliable stretch-proof strength and property.

Description

technical field [0001] The invention belongs to the technical field of machining process design, and in particular relates to a process method for connecting a three-body structure of a titanium-aluminum alloy turbine shaft. Background technique [0002] The turbine shaft of a general vehicle diesel engine supercharger is welded with the alloy steel shaft 42CrMo by welding the turbine impeller made of cast nickel-based superalloy K418 material, and the overall weight of the components is relatively heavy. (The specific gravity of K418 material is 8.0g / cm 3 ), and the supercharger turbine shaft made of titanium-aluminum alloy turbine impeller and alloy steel shaft 42CrMo, the component weight is relatively light (the specific gravity of the titanium-aluminum alloy turbine impeller material is 3.9g / cm 3 ). Therefore, the application of titanium-aluminum alloy turbine impeller will reduce the weight of the turbocharger turbine and reduce the moment of inertia of the turbine r...

AI Technical Summary

Problems solved by technology

However, titanium-aluminum alloy is an intermetallic compound, and the conventional welding method cannot realize the direct connection of the two bodies in the past, and the tensile strength requirement required by the design cannot be achieved.

According to foreign and domestic relevant data reports and patent retrieval, no suitable patent was found on the connection method, only a patent with a publication number of CN1183334A was found, and its patent principle is suitable for single-piece production in the development stage. For the current batch engineering Production, to ensure the stability, reliability and repeatability of its connection performance, etc., all put forward new requirements