A method for equidistant spiral rolling of large-size aluminum alloy ultra-fine-grained rods

Abstract

The invention discloses an equal-distance spiral rolling method for a large-size aluminum alloy ultrafine grain bar, and relates to the technical field of machining, in particular to an equal-distancespiral rolling method for the large-size aluminum alloy ultrafine grain bar. The method comprises the following steps that firstly, an aluminum alloy blank with the diameter size D being 40-200 mm and the length being 300-5,000 mm is selected; secondly, the above aluminum alloy blank is placed in a heating furnace to be heated to 410-440 DEG C; thirdly, the heated aluminum alloy blank is transferred into an inclined rolling mill material guiding groove from the heating furnace, and the transferring time is 5-20 s; fourthly, feeding is conducted in the inclined rolling mill material guiding groove, the aluminum alloy blank is fed into a deformation area between an inclined rolling mill inlet and an inclined rolling mill outlet, and the aluminum alloy blank spirally moves in the deformationarea till deformation is over; and fifthly, the second step, the third step and the fourth step are repeatedly conducted, 2-12 times of spiral rolling is conducted on the aluminum alloy blank, and the integral aluminum alloy ultrafine grain bar is obtained. The equal-distance spiral rolling method has the beneficial effects that the penetration depth of the deformation area is large, and multi-pass rolling can be repeatedly conducted. Continuous and stable local deformation and press-torsion composite three-dimensional sharp deformation are achieved, and an ideal grain refining effect can beobtained.

Description

technical field [0001] The invention relates to the technical field of mechanical processing, in particular to an equidistant spiral rolling method for large-size aluminum alloy ultra-fine-grained rods. Background technique [0002] Ultrafine crystal / nanocrystalline materials are one of the hot topics in current material science research. Compared with traditional coarse-grained metal materials, ultra-fine-grained / nanomaterials show more excellent or unique properties in some aspects, such as higher strength and hardness, better fatigue performance and superplasticity, better Corrosion resistance, wear resistance and biological characteristics, etc. These excellent properties make ultra-fine-grained materials have broad application prospects in engineering fields such as aviation, aerospace, automobiles, marine, and biology, and also make people pay more attention to the development of ultra-fine-grained / nano-prepared technologies. From the perspective of mechanical proper...

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Problems solved by technology

[0008] (3) Cumulative stacking rolling method: stack the original plates in double layers after surface treatment, roll and weld them together after heating, then cut them from the middle and send them back to the surface treatment before the next rolling and welding cycle, in order to ensure The plates can be welded together, and the reduction in each pass must not be less than 50%, but the ARB process requires strong shear stress conditions, and lubricants cannot be used, which is detrimental to the service life of the rolls

However, the ultrafine-grained aluminum alloys obtained in these patents have small geometrical dimensions and cannot be extended to the aerospace field for the time being.

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