Electro-plastic two-roll mill of low-temperature liquid nitrogen cooling medium

Abstract

The invention discloses an electro-plastic two-roll mill of a low-temperature liquid nitrogen cooling medium. A rack (6) at the entrance of the two-roll mill is provided with two dragging tracks (12 and 12'); a track groove between the two dragging tracks (12 and 12') is internally provided with a feeding clamp (13); a cooling tank (14) is arranged below the rear ends of the two dragging tracks (12 and 12'); the rack (6) at the entrance of the two-roll mill is provided with a delivery guide (16); a collecting tank (4) is arranged below the delivery guide (16); a liquid nitrogen container (9) is arranged on a bracket (10) for fixing the rack (6); the negative electrode of an impulse power source (1) is connected with the upper plywood of the feeding clamp (13) by a cable (2), and the positive electrode of the impulse power source (1) is connected with a roll electrode (3) by the cable (2). In the rolling process by using the electro-plastic two-roll mill, the low-temperature liquid nitrogen is automatically sprayed on a rolled piece deformation zone; and the rolled piece is in the low temperature environment of minus 160 to minus 70 DEG C before the process of rolling processing, in the process of rolling plastic deformation, and after the process of rolling processing. Hard pulse current vertical to the deformation direction is imported into the rolled piece deformation zone between an upper roller and a lower roller, and the electro-plastic effect is used to reduce the deformation resistance of the rolled piece and improve plastic deformation capacity of the rolled piece, thus obtaining the rolled piece product with serious plastic deformation.

Description

technical field [0001] The invention relates to the technical field of pressure processing of metal materials, in particular to an electroplastic two-roll rolling mill with a low-temperature liquid nitrogen cooling medium. Background technique [0002] In the past 20 years, the refinement of metal material grains by plastic deformation technology has been widely proved and applied in practice. Among them, the preparation of metal nano-grain materials by severe plastic deformation technology is more typical, and has been widely used by researchers all over the world. research and use. However, with the reduction of the grain size of the metal material, the recovery and recrystallization limit temperature of the metal grain decreases, and the growth and recovery of the grain will occur at a lower temperature. At the same time, along with the metal plastic deformation process, there will be plastic deformation heat, which intensifies the growth and recovery process of the grai...

AI Technical Summary

Problems solved by technology

[0003] In addition, due to the limitations of both the inherent deformation capacity of the material and the severe plastic d...

Images