Method for reducing forging residual stress of turbine disks via gradient speed control on basis of numerical calculation

Abstract

The invention belongs to the technical field of metal material processing, and relates to a method for reducing forging residual stress of turbine disks via gradient speed control on the basis of numerical calculation. According to the method, influences, on residual stress distribution, of forging speeds of turbine disks in the forging process are analyzed by combining a numerical simulation method and experimental tests, and a novel method for reducing residual stress of turbine disks via gradient speed control is given on the basis of a law of influences, on the residual stress, of the forging speeds, so that the shaping quality and service life of the turbine disks can be improved and prolonged. Aiming at the residual stress problems of turbine disks, numerical modeling is carried outon the forging process to analyze the stress strain and temperature field distribution, in each stage in the forging process, of the turbine disks, so that important information such as flowing law inthe turbine disk forging process, thermal parameter distribution in disk forge pieces, load-stroke / energy-stroke curves, mould working stress and the like in forging process and mould design processis disclosed.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and relates to a method for reducing the forging residual stress of a turbine disc by gradient speed control based on numerical calculation. Background technique [0002] The safety, reliability and durability requirements of engines, especially commercial engines, are significantly higher than those of military aircraft, and these performances mainly depend on core components such as discs and blades, so advanced materials and strict manufacturing processes are required Prepare the above key parts. As the key hot-end part of the engine, the turbine disk needs to withstand high temperature, high pressure and complex alternating loads. [0003] Residual stress refers to the stress that exists inside an object and maintains its own balance when there is no external force or external moment. Due to the inhomogeneity of temperature, deformation and material phase transition in the...

AI Technical Summary

Problems solved by technology

However, most of them use detection methods. In the detection process of residual stress, there are problems such as inaccurate detection results and high costs caused by different detection equipment and detection depth limitations.

[0007] In the forging process of the turbine disk, the forging speed has an important influence on its residual stress. In the traditional forging process of the turbine disk, only the forming control is considered, so the uniform forging speed is adopted. With the improvement of the engine performance and the fatigue service performance requirements of the turbine disk , the manufacturing process of the turbine disc is gradually upgraded from the controlled shape research to the controlled research, and the usual constant velocity forging process can no longer meet the controllability requirements of the turbine disc forging process, and it is urgent to reform the existing forging process

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