Radial forging strain-induced semi-solid integral die forging process for blades

Abstract

The invention relates to a radial forging type strain-induced semi-solid integral die forging process of a blade. The radial forging type strain-induced semi-solid integral die forging process comprises the following steps: pre-heating and repetitively upsetting and drawing out an ultra-high strength steel or titanium alloy-made metal bar for forming an outer cylinder forge piece of an undercarriage so as to obtain a distorted metal rod for storing distortion energy at first; then, radially forging the distorted metal rod by utilizing waste heat so as to obtain a radial forging distorted blank having a ladder shape, and quenching; secondarily remelting a second radial forging distorted blank so as to obtain a semi-solid blank of the blade with the solid phase ratio of 40-60%; and finally, carrying out semi-solid integral die forging of the semi-solid blank of the blade so as to obtain a blade forming part. The radial forging type strain-induced semi-solid integral die forging process disclosed by the invention has the characteristics of being simple in process, low in forming force, high in material utilization rate and good in mechanical property of the product.

Description

Technical field [0001] The invention belongs to the technical field of blade manufacturing, and particularly relates to a radial forging type strain-induced semi-solid integral die forging process of the blade. Background technique [0002] Semi-solid processing is a metal forming method proposed by Professor Flemings of Massachusetts Institute of Technology in the 1970s. The so-called semi-solid processing is the process of heating the metal to the temperature between the solidus and liquidus and holding it for a certain period of time to obtain spherical or nearly spherical grains, and then forming them, spherical or nearly spherical The semi-solid slurry has the advantages of good fluidity, low forming force and good performance of the formed parts, so this process has received more and more attention. [0003] In the semi-solid forming process, how to obtain a semi-solid slurry with a non-dendritic fine uniform nearly spherical microstructure is a very critical link. This link...

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Problems solved by technology

[0006] There are many types of blades, large quantities, advanced materials, complex shapes, and high requirements for internal and external quality. At present, the manufacturing processes at home and abroad are mainly: (1) Machining and forming. The machined blades have high precision, good performance, and durability. Corrosion, but the processing cost is high and the efficiency is low; (2) casting forming, although the casting method has high forming efficiency, but due to the defects such as shrinkage porosity and pores in the casting, the performance of the blade is unstable and the mechanical properties of the product are poor. And it is difficult to achieve near-net shape, and certain machining is required in the follow-up; (3) Forging and forming. The traditional process of blade forging in my country is ordinary die forging, but the design margin of ordinary die forging is relatively large, and the blades produced are often "fat". (4) Precision forging, Rolls-Royce company in the UK adopts the blade precision forging process to manufacture blades, except for a small amount of machining on the tenons, the blades The surface, tenon inner edge surface and airfoil resistance boss do not need to be machined, which ensures the complete forged metal streamline

This advanced blade forging technology not only saves metal materials, reduces machining hours, but also greatly reduces blade manufacturing costs, but there are still problems of large forging force per unit area and low efficiency of finished products

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