Method for preparing aero-engine casing

Abstract

The invention discloses a method for preparing an aero-engine casing, which relates to a technical process for preparing the aero-engine casing by adopting a near-size thermal forming method. The method for preparing the aero-engine casing is characterized in that in a preparation process, an annular alloy blank which comprises 4.3 to 6.0 weight percent of Al, 2.0 to 3.0 weight percent of Sn, 0.2 to 0.8 weight percent of Fe and the balance of Ti and inevitable impurities is subjected to circumferential rotating deformation rolling. In the method, an alloy element Fe is added into an alloy, so cracking in thermal and cold processing is avoided effectively, and a processed window is wide; and a contour roll of which the outside cylindrical surface has a convex structure matched with the concave structure of the external wall of the aero-engine casing and a core roll are adopted to perform circumferential rotating deformation rolling, the size of the section of a formed special annular section approaches the size of the section of the finished product, the interruption of a processing line is avoided, mechanical processing amount is reduced, and expensive raw materials are saved.

Description

technical field The invention discloses a method for preparing an aero-engine casing, which relates to a process for preparing the aero-engine casing by adopting a near-size thermoforming method. Background technique The shape of the aero-engine casing is ring-shaped, and the shape of the outer wall of the axial section of the ring is generally "concave". A large number of such rings are made of TA7 titanium alloy (nominal composition Ti-5Al-2.5Sn), which has high thermal strength, medium room temperature strength, good weldability and corrosion resistance, and is widely used in manufacturing Non-rotating parts such as aircraft engine cases. However, the alloy still has problems such as poor plasticity in hot and cold working processes, easy cracking of the surface during processing, narrow processing window, etc., and it is difficult to form. At present, most of the existing aero-engine casing production processes use the forging method to prepare the ring blank, and then...

AI Technical Summary

Problems solved by technology

This type of processing method has problems such as complex process, large metal turning loss, low material utilization rate, low production efficiency, high production cost, and the cutting of the processing flow line at the groove part, which affects the performance of the processed part.

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