Rolling and shaping method of titanium alloy taper ring forged piece

Abstract

The invention discloses a method for rolling and shaping titanium alloy tapered-ring forge pieces. In order to obtain the titanium alloy tapered-ring forge piece with good organization and performance, and realize precise rolling, the method comprises the following steps: an alloy bar is subjected to heating and continuous upsetting, deformed by 50%-55%, made into solid cake, and then subjected to punching to cause the hole diameter to be 30%-35% of the outer diameter thereof so as to obtain a hollow cake; the hollow cake is subjected to heating and rolling and deformed by 20%-25% to obtain a rectangular ring blank; the rectangular ring blank is subjected to heating and rolling and deformed by 30%-35% to obtain a rectangular pre-rolling blank; the pre-rolling blank is subjected to heating, loaded in the rolling mould of a ring rolling mill, rolled in the tapered hole of the rolling mould, and deformed by 25%-30% to obtain the tapered-ring forge piece. When being rolled, the widening speed of the pre-rolling blank along radial direction is 2mm / s-15mm / s, and the received radial roll force is 40000kg-220000kg. The method is mainly used for shaping the tapered-ring forge piece of an aeroengine. By the method, the tapered-ring forge piece, the ring surface of which is a complex curved surface and distributed in a streamline form along the shape of the piece, can be obtained.

Description

technical field [0001] The invention relates to a rolling forming method of a ring forging, in particular to a rolling forming method of a titanium alloy conical ring forging. Background technique [0002] Aeroengine conical ring forgings made of titanium alloys (such as TC4 and other material grades), such as turbine outer rings, casings and other parts, require forgings to have better performance and structural stability due to long-term work at high temperatures. [0003] The article "New Manufacturing Process and Numerical Simulation of Large Tapered Ring Parts" (Wang Zewu et al., "Nuclear Power Engineering", Volume 28, No. 2, Pages 69-72, April 2007) discloses a conical Ring forming process, which includes billet making, heating, rolling and subsequent processing. When the tapered ring of ordinary carbon steel is rolled by this process, the main roll, core roll and holding roll of the ring rolling machine are processed into a tapered shape, and then the tapered ring bi...

AI Technical Summary

Problems solved by technology

For the tapered ring forgings processed in this way, the machining allowance of the ring forging blank is large, the dimensional accuracy of the forging is poor, and the shape streamline of the forging cannot be distributed along the shape of the part; due to the large amount of processing, it is time-consuming, laborious and wastes a lot of valuables. Titanium alloy material cuts off the shape streamline of the forging, which has an adverse effect on the structure and performance of the forging

[0006] When rolling a titanium alloy conical ring forging, from the alloy bar to the final rolling into a conical ring forging, the deformation of the titanium alloy has a great influence on the structure and performance of the ring forging, and the inaccurate selection of the deformation will cause Defects such as coarse grains, structure variation, crushing, rolling cracks, folding, interlayers and other defects in ring forgings affect the delivery and use of forgings

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