Current assisted rolling device for realizing rod surface layer gradient nanocrystallization

Abstract

The invention discloses a current assisted rolling device for realizing rod surface layer gradient nanocrystallization. The device comprises a frame module, a lifting mechanism whose one end is fixedon the upper surface of the bottom of the frame module, and a rod rotating mechanism fixed in the center of the upper area of the frame module; a rolling mechanism is arranged at the top of the framemodule, and is positioned on the peripheral outer side of the rod rotating mechanism; and the rolling mechanism is overlapped with the axis of the rod rotating mechanism. A rolling technology is combined with current; the current is applied to the plastic deformation process of the surface layers of machined rods, so that the forming capacity of the rods is improved, and the flowing stress is reduced; gradient nanostructures are formed on the surface layers of the machined rods, so that the strength, the hardness and the wear resistance of the rods are further improved, the workpiece comprehensive performance can be further improved, and the service life is effectively prolonged; and the device is simple in structure, can greatly reduce the production cost, and achieves more ideal technical effects.

Description

technical field [0001] The invention relates to the field of realizing nanometerization of the surface layer of metal materials by rolling processing and current-assisted forming, in particular to a current-assisted rolling processing device for realizing gradient nanometerization of the surface layer of bar materials. Background technique [0002] At present, the methods for forming nanometerization on the surface of metal materials include: surface mechanical grinding treatment method, rolling method, and surface mechanical rolling method. Rolling processing is to use the rolling tool to apply a certain pressure on the surface of the workpiece, and the surface of the workpiece will repeatedly produce strong plastic deformation, so as to achieve the purpose of surface grain refinement, which can effectively improve the strength and hardness of the material. At the same time, the wear resistance of the workpiece is improved, and the fatigue strength of the workpiece is impro...

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Problems solved by technology

[0003] In view of the above problems, the object of the present invention is to provide a combination of current-assisted forming technology and rolling processing technology, using the electroplastic effect of current-assisted forming to improve the plastic forming ability of the workpiece, reduce the flow stress of the workpiece, and A current-assisted rolling processing device that realizes the gradient nanometerization of the surface layer of the bar to solve the problems that the surface layer of the ordinary rolling processing workpiece cannot obtain a gradient nanostructure and single-ball rolling and single-wheel rolling are easy to deform the workpiece.

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