Radial friction welding process and device for turbine blades and turbine disk

Abstract

The invention discloses a radial friction welding device for turbine blades and a turbine disk. The radial friction welding device comprises the turbine disk, wherein the turbine blades contacting with the turbine disk are uniformly arranged on the external circumference of the turbine disk; the turbine blades are limited and fixed through a guide groove and a limit groove, which are located at two sides and match with each other; upsetting rods are inserted into a matching gap between the guide groove and the limit groove; one ends of the upsetting rods prop against a welding pin block at the bottoms of the turbine blades and the other ends come into contact with wedge-shaped internal surfaces of a reversing fixture; the turbine disk is driven to rotate through rotating a power device; an axial force applying to the reversing fixture is gradually increased through an axial thrusting device; the axial force is converted into a radial force to the upsetting rods through the reversing fixture, and then a radial force is applied to the turbine blades; a frictional force between the turbine blades and the turbine disk is gradually increased, and dynamic equilibrium amount between friction heat and dissipated heat can be maintained; an upsetting pressure is instantly applied, a rotating speed of the turbine disk is reduced to be zero and the welding is finished. The invention further discloses a welding process using the device.

Description

technical field [0001] The invention relates to a welding process and device, in particular to a radial friction welding process and device for a turbine blade and a turbine disc. Background technique [0002] At present, a typical gas turbine engine consists of components such as a rotating turbocharger and a turbine disk, and the components include annularly arranged airfoil turbine blades fixed on the periphery of the disk. There are many ways in which the turbine blades are attached to the turbine disk. For example, through finishing, the root of the turbine blade is processed into a "fir tree"-shaped vertebral head, and then the vertebral head of the turbine blade is pressed into the mortise and groove of the turbine disk by extrusion, so as to achieve a fir tree mortise and groove connection . Or by the method of linear friction welding, the reciprocating motion of the turbine blade is friction welded to the fixed turbine disk. Or the turbine blades are welded on th...

AI Technical Summary

Problems solved by technology

[0003] Existing methods of connecting turbine blades and turbine discs have certain limitations. For example, using the fir tree tongue-and-groove connection method, the life of the turbine blades is short, and the turbine blades need to be repaired after a period of use; linear friction welding has low welding efficiency and high cost. ; Fusion welding is a rapid physical and chemical metallurgical process, which is easy to form defects such as pores, inclusions and micro-cracks, which affect the welding quality

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