Equal-distance rolling method of spiral conic roller of large-size 45 steel ultra-fine grain bar

Abstract

The invention relates to the technical field of machining, in particular to an equal-distance rolling method of a spiral conic roller of a large-size 45 steel ultra-fine grain bar. The equal-distancerolling method comprises the following steps that S1, a 45 steel blank with the diameter dimension D ranging from 40 mm to 150 mm and the length ranging from 300 mm to 5000 mm is selected; S2, the 45steel blank is placed in a heating furnace to be heated to range from 850 DEG C to 980 DEG C; S3, the heated 45 steel blank is transferred into a guide chute of an inclined rolling machine from the heating furnace; S4, feeding is carried out in the guide chute of the inclined rolling machine, the 45 steel blank is fed into a deformation area between an inlet and an outlet of the inclined rolling machine, and the 45 steel blank spirally moves in the deformation area till deformation is finished; and S5, the steps from S2 to S4 are repeated, and the 45 steel blank is spirally rolled two to ten times to obtain the 45 steel overall ultra-fine grain bar. The equal-distance rolling method has the advantages that the penetration depth of the deformation area is large, and multi-pass rolling can be carried out in a reciprocating manner. Continuous and stable partial deformation is achieved, pressing-twisting composite three-dimensional severe deformation is achieved, and the ideal grain refining effect can be obtained.

Description

technical field [0001] The invention relates to the technical field of mechanical processing, in particular to a method for equidistant rolling of large-size 45 steel ultra-fine-grained rods with spiral conical rolls. 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. , marking the arrival of the microstructural era of SPD research. [0003] The definition of SPD generally recognized after 2006: a metal forming method that produces super large strains in the block but does not significant...

AI Technical Summary

Problems solved by technology

[0020] The object of the present invention is to provide a method for equidistant rolling of helical conical rolls for large-scale 45 steel ultra-fine-grained rods, so as to solve the problem of small deformation zone, poor penetration, size and refinement in the above-mentioned background technology. Limitations, low efficiency, etc.

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