A method of manufacturing drum shaft forgings

Abstract

The invention belongs to the field of alloy forging, and in particular relates to a method for manufacturing drum shaft forgings. The method includes: selecting a bar; at the first forging initial temperature, performing first-fire constrained upsetting on the bar to obtain a cake with a cylindricity of less than 5, and to reduce the surface temperature of the cake to below 600° C. within 30 minutes; At the second initial forging temperature, carry out one-fire pre-forging on the cake billet to obtain a cylindrical intermediate billet and reduce the surface temperature of the cylindrical intermediate billet to below 600°C within 30 minutes, wherein the axial section of the cylindrical intermediate billet is similar to inverted I type ; At the third initial forging temperature, carry out one-fire final forging to the cylindrical intermediate billet to obtain a drum shaft forging and make the surface temperature of the drum shaft forging drop below 600°C within 15 to 20 minutes, wherein the drum shaft forging The axial section is H-like. By changing the traditional free forging billet to die forging billet, uncontrollable factors in the forging forming process are eliminated, and the control of heating and deformation in the forging process is guaranteed.

Description

technical field [0001] The invention belongs to the field of alloy forging, and in particular relates to a method for manufacturing drum shaft forgings. Background technique [0002] The drum shaft forging is the key load-bearing rotating part of the core part of the aero-engine. GH4169 alloy is a common material for manufacturing the drum shaft forging. Thinner, the tensile strength of forgings at room temperature σb≥1345MPa, the yield strength at room temperature σb≥1100MPa, and the high-temperature durability life is 650℃ / 725MPa≥25h. [0003] Drum shaft forgings are typical thin-walled straight forgings. The forgings used to be designed with "U"-shaped cross-sections. The forgings formed with this design belong to reverse extrusion forming, which is extremely difficult to form and requires large-tonnage equipment. During the forming process, the bottom of the forging is always subjected to upsetting deformation, and other parts of the forging are only deformed in transla...

AI Technical Summary

Problems solved by technology

[0003] Drum shaft forgings are typical thin-walled straight forgings. The forgings used to be designed with "U"-shaped cross-sections. The forgings formed with this design belong to reverse extrusion forming, which is extremely difficult to form and requires large-tonnage equipment. During the forming process, the bottom of the forging is always subjected to upsetting deformation, and other parts of the forging are only deformed in translation. There are large differences in the precipitation and distribution of strengthening phases, resulting in large differences in the microstructure and properties of each part of the final forging

Moreover, the forgings are formed many times, and the forgings need to be machined and polished between each time. The production cycle is long and the production efficiency is low.