Method for rolling and shaping aluminum alloy conical ring

Abstract

The invention discloses a rolling and shaping method for an aluminum alloy conical ring forging in order to obtain the alloy conical ring forgings with excellent tissues and properties as well as realize accurate rolling. The method includes the following steps: alloy bar material is heated, carried out continuous upsetting and deformed by 65 to 70 percent so as to be made into a solid cake and then is punched again to lead the alloy bar material to be made into a hollow round cake after the aperture dimension of the alloy bar material is 35 to 40 percent of the dimension of the outer diameter thereof; a rectangle ring blank is obtained after the hollow round cake is heated and deformed by 35 to 40 percent by a sweeping tackle reaming hole; the ring blank is heated and arranged into an expansion mould to be made into a conical pre-rolling blank after being deformed by 10 t0 15 percent; the conical pre-rolling blank is heated and arranged in a rolling die of a ring rolling machine and forms a conical ring forging after being rolled and deformed by 40 to 45 percent in a section groove of the die. When in expansion, the broadening speed of the pre-rolling blank along the radial direction is 2mm / s to 15mm / s with a radial rolling force of 20000kg to 120000kg. The method is mainly used for the shaping of the conical ring forging of an aeroengine or a gas turbine. The method can be adopted to obtain the concial ring forging that is arranged in a flow line along the outline of a part and the circular surface of the forging is a complex curve.

Description

technical field [0001] The invention relates to a rolling forming method of a ring forging, in particular to a rolling forming method of an aluminum alloy tapered ring forging. Background technique [0002] The conical ring forgings of civil aeroengines made of aluminum alloy (such as American material grade 2618, etc.), such as inner rings and other components, are required to have good mechanical properties and structural stability due to long-term work at high altitude and high pressure. [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...

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. The aluminum alloy material cuts off the shape streamline of the forging, which adversely affects the structure and performance of the forging

[0006] When rolling aluminum alloy tapered ring forgings, from the alloy bar to the final rolling into tapered ring forgings, the deformation of the alloy has a great influence on the structure and properties of the ring forgings. Due to the poor plasticity of the aluminum alloy, the deformation If the selection is not accurate, it will cause defects such as coarse grains, rolling cracks, crushing, and flashing of ring forgings, which will affect the delivery and use of forgings.

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