Method and system for rolling difficult-to-machine metal material by combining electro-plasticity with temperature plasticity

Abstract

The invention relates to a method for rolling a difficult-to-machine metal material by combining electro-plasticity with temperature plasticity. The method comprises the following steps of: preheating a roller to the recovery temperature of a machined metal material and lower than the recrystallization temperature of the metal material; and inputting high-energy pulse current into a machining section of the moving metal material, performing electro-plastic treatment under the actions of the thermal effect and non-thermal effect of the metal material, and feeding the machining section into the preheated roller for rolling by combining electro-plasticity with temperature plasticity. In the rolling process, electro-plasticity and temperature plasticity are combined and unbalanced kinetic energy produced by the material due to the rise of atomic potential energy and strong electric stimulation of pulse current under heating condition is fully utilized, so that movement of crystal defects such as diffusion, dislocation and the like of atoms is facilitated, the internal microstructure of the metal material is improved, a tissue which is beneficial to enhancing of intensity and toughness (plasticity) is formed, and the plasticity of the material at low temperature is enhanced. The method is suitable for rolling difficult-to-machine metal materials such as magnesium alloys, nickel-titanium alloys, tungsten alloys and the like.

Description

Technical field [0001] The invention relates to the rolling technology of metal materials, in particular to a method and system for rolling various types of difficult-to-process metal materials by combining electroplasticity and warm plasticity. The method combines electroplastic rolling and warm rolling to make difficult-to-process metals The material also has good processing plasticity at lower temperature, realizing lower temperature processing. Background technique [0002] Warm rolling, also known as "medium temperature rolling", is a rolling method that controls the deformation temperature below the metal recrystallization temperature and above the recovery temperature. It has some advantages of hot rolling and cold rolling. Compared with cold rolling, because the work hardening of the material is restored to a certain extent during warm rolling, the yield strength of the material is low, the plasticity is improved, and there is no shortcomings such as surface oxidation dur...

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Problems solved by technology

[0005] In order to solve the problem of limited improvement of metal plasticity by warm rolling, and the small temperature rise of electroplastic rolling due to the pulse current makes it difficult for simple electroplastic rolling to meet the problems of rolling wide and thick materials. Advantages—namely, the reduction of material deformation resistance caused by thermal effects and electrical effects respectively. The present invention provides a method and system for rolling difficult-to-machine metal materials in combination with electroplasticity and thermoplasticity; by appropriately increasing the surface temperature of the roll and Combining the electroplastic effect to jointly improve the microstructure inside difficult-to-machine metal materials to form a structure that is conducive to improving strength and toughness (plasticity)

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