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Method for connecting titanium-aluminum alloy turbine with 42CrMo steel shaft

A titanium-aluminum alloy and connection method technology, applied in welding equipment, welding equipment, auxiliary welding equipment, etc., can solve the problems of inability to meet strength requirements, low production efficiency, complex process, etc., to increase the effective contact area and improve the bonding. Strength, simple craftsmanship

Inactive Publication Date: 2011-10-12
LUOYANG SUNRUI TI PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, how to connect the titanium-aluminum alloy to the steel shaft is a very complicated problem. The reported connection methods include brazing and friction welding. The welding strength of brazing is lower than that of friction welding, and the process is more complicated and the production efficiency is lower.
[0005] In Zhao Quanzhong's 2000 Northwestern Polytechnical University master's thesis "TiAl Intermetallic Compounds and Structural Steel Friction Welding Technology Research", the author tested the direct friction welding of titanium aluminum and 42CrMo steel shaft, the results showed that direct friction welding of two materials can obtain certain High-strength joints, but their strength is extremely low, and they will break when dropped at a height of 1m, which cannot meet the strength requirements at all

Method used

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  • Method for connecting titanium-aluminum alloy turbine with 42CrMo steel shaft
  • Method for connecting titanium-aluminum alloy turbine with 42CrMo steel shaft
  • Method for connecting titanium-aluminum alloy turbine with 42CrMo steel shaft

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Embodiment 1

[0032] The titanium aluminum alloy adopts Ti-46Al-4Nb-0.6Cr-0.2Ni-0.2Si (atomic fraction), the steel shaft is 42CrMo steel shaft, and the intermediate transition shaft is made of Inconel713 superalloy. Firstly, as shown in Drawing 1, the joint surface of the titanium-aluminum alloy, Inconel713 alloy, and 42CrMo steel shaft is processed in place, the α angle is 30°, the shaft diameter is 20mm, and the groove size is (4+11)×2mm, that is, the convex The diameters of the upper and lower ends of the table are 4mm, 11mm, and the height is 2mm. During processing, the lathe spindle speed is selected to be 200 rpm, and the cutting depth is selected to be 0.2mm.

[0033] Friction welding of Inconel713 shaft and 42CrMo steel shaft: Clamp the Inconel713 shaft and 42CrMo steel shaft on the spindle end and fixture end of the C25 continuous drive friction welding machine respectively. The welding process parameters are: friction pressure 420MPa, upsetting pressure 580MPa, friction time 5 sec...

Embodiment 2

[0038] The titanium aluminum alloy adopts Ti-48Al-2Nb-0.7Cr-0.4Si (atomic fraction), the steel shaft is 42CrMo steel shaft, and the intermediate transition shaft is made of GH1016 superalloy. Firstly, as shown in Drawing 1, the joint surface of the titanium-aluminum alloy, GH1016 alloy, and 42CrMo steel shaft is processed in place, the α angle is 60°, the shaft diameter is 20mm, and the groove size is (6+10)×3.5mm, that is The diameters of the upper and lower end surfaces of the boss are 6mm and 10mm respectively, and the height is 3.5mm. During processing, the lathe spindle speed is selected to be 205 rpm, and the cutting depth is selected to be 0.3mm.

[0039] Friction welding of GH1016 shaft and 42CrMo steel shaft: Clamp the GH1016 shaft and 42CrMo steel shaft on the spindle end and fixture end of the C25 continuous drive friction welding machine respectively. The welding process parameters are: friction pressure 450MPa, upsetting pressure 600MPa, friction time 5 seconds, h...

Embodiment 3

[0044] The titanium aluminum alloy adopts Ti-48Al-2Nb-0.7Cr-0.4Si (atomic fraction), the steel shaft is 42CrMo steel shaft, and the intermediate transition shaft is made of K403 cast superalloy. Firstly, as shown in drawing 1, the joint surface of the titanium-aluminum alloy, K403 alloy, and 42CrMo steel shaft is processed in place, the α angle is 60°, the shaft diameter is 20mm, and the groove size is (6+10)×3.5mm, that is The diameters of the upper and lower end surfaces of the boss are 6mm and 10mm respectively, and the height is 3.5mm. During processing, the lathe spindle speed is selected to be 200 rpm, and the cutting depth is selected to be 0.1mm.

[0045] Friction welding of K403 shaft and 42CrMo steel shaft: Clamp the K403 shaft and 42CrMo steel shaft on the spindle end and fixture end of the C25 continuous drive friction welding machine respectively. The welding process parameters are: friction pressure 450MPa, upsetting pressure 600MPa, friction time 5 seconds, hold...

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Abstract

The invention discloses a method for connecting a titanium-aluminum alloy turbine with a 42CrMo steel shaft. The turbine members consist of a titanium-aluminum alloy turbine, an intermediate transitional shaft and a 42CrMo steel shaft, wherein the titanium-aluminum alloy turbine and the intermediate transitional shaft, the intermediate transitional shaft and the 42CrMo steel shaft are respectively combined in a friction welding mode. A friction welding contact part is designed into a mode that a lug boss and a concave groove are combined with each other, the axial cross sections of the lug boss and the concave groove are isosceles trapezoids, an included angle between a base and a hypotenuse of each trapezoid is 30-60 DEG, the length ratio of a top edge to the base of the trapezoid is 0.3-0.7, and the ratio of the flat area formed by the top edge of the trapezoid to the cross sectional area of the shaft is 0.01-0.1. According to the method disclosed by the invention, the bonding strength of the whole structure is effectively improved through increasing the effective contact area of the welding surface; after welded, all materials are ruptured in a titanium-aluminum parent material region; the turbocharging efficiency can be greatly increased; the engine transient responsiveness is enhanced; and the pollutant discharge is reduced; in addition, the method has a simple process and can be used for realizing mass production.

Description

[0001] technical field [0002] The invention relates to a connection method between a titanium-aluminum alloy turbine and a 42CrMo steel shaft. Background technique [0003] At present, the turbine material popular in the world for automobile engines, tank engines, and ship engines is K418, and the connection method with the steel shaft is usually friction welding, but the disadvantage of this structure is that the overall mass of the turbine is large, resulting in engine damage Poor transient response. [0004] In addition to the advantages of general intermetallic compounds, titanium-aluminum alloy has the characteristics of low density, good oxidation resistance, low thermal conductivity, high specific strength, and high specific elastic modulus. It is especially suitable for automobile engines, tank engines and ships. The turbine end of a turbocharger for an engine, etc. However, how to connect the titanium-aluminum alloy to the steel shaft is a rather complicated iss...

Claims

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Application Information

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IPC IPC(8): B23K20/12B23K33/00B23K37/00C21D9/00C21D1/26C22F1/18
Inventor 王孟光陈志强包淑娟周洪强吴胜男
Owner LUOYANG SUNRUI TI PRECISION CASTING
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