Spiral tapered roll type equal-roll-spacing rolling method of large-size ultrafine aluminum alloy crystal bar

Abstract

The invention provides a spiral tapered roll type equal-roll-spacing rolling method of a large-size ultrafine aluminum alloy crystal bar, and relates to the technical field of mechanical processing. The method comprises the steps of S1, selecting an aluminum alloy blank of which the diameter D is 40-200nm and the length is 300-5000mm; S2, feeding the aluminum alloy blank into a heating furnace, and heating to reach the temperature of 380-450 DEG C; S3, transferring the heated aluminum alloy blank from the heating furnace into a material guide groove of a skew rolling mill; S4, feeding materials into the material guide groove of the skew rolling mill; feeding the aluminum alloy blank between a deformation area between an inlet and an outlet of the skew rolling mill; and spirally moving thealuminum alloy blank in the deformation area until the deformation is finished; and S5, repeating the steps S2-S4; and spirally rolling the aluminum alloy blank in 2 to 14 times to obtain an integralultrafine aluminum alloy bar. The method has the beneficial effects that the deformation area is high in penetration depth; and the rolling can be performed in a plurality of times in a reciprocatingmanner; the local deformation is continuously stably performed; the pressing-twisting combined three-dimensional severe deformation is carried out; and ideal grain refining effect is obtained.

Description

technical field [0001] The invention relates to the technical field of mechanical processing, in particular to a method for rolling a large-size aluminum alloy ultra-fine-grained bar with a helical conical roll and an equal roll distance. Background technique [0002] When preparing nano-scale materials, the equivalent strain should usually be greater than 6, which is difficult to achieve by traditional plastic processing methods, but can be achieved by applying Severe Plastic Deformation (SPD). Modern SPD started from the combined forming method of large pressure and shear deformation proposed by Bridgemen, and its rapid development began in the mid-1970s in the former Soviet Union and Western countries. Segal developed the Equal-Channel Angular Pressing (ECAP) technology. , Valiev's great possibility of improving performance through the modification of grain structure marks the arrival of the microstructural era of SPD research. Over the past 10 years, thousands of resear...

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Problems solved by technology

[0021] The purpose of the present invention is to provide an equidistant spiral rolling method for large-sized aluminum alloy ultra-fine-grained rods, so as to solve the problem of small deformation zone, poor penetration, limited size and refinement degree, etc. Low efficiency and other issues

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