Cold roll for rolling lithium battery protection plate and manufacturing method thereof

Abstract

The invention discloses a cold roll for rolling a lithium battery guard plate and a manufacturing method thereof. The cold roll contains the following chemical components in percentage by mass: 0.7-1.0% of C, 0.2-1.0% of Si, 0.2-0.6% of Mn, no more than 0.02% of P, no more than 0.02% of S, 2.0-4.0% of Cr, 0.2-0.6% of Ni, 0.2-0.8% of Mo, 0.1-0.5% of V and the balance of Fe and inevitable impurities. The manufacturing method of the cold roll comprises the processing steps of electroslag steel ingot fusion casting, roll blank forging, quenching and tempering treatment, induction hardening treatment, cold treatment, final heat treatment, machining and the like. The cold roll disclosed by the invention has high hardness and wear resistance; and under the service condition of the same strength, the service life of the cold roll is prolonged by 45-55% in comparison with the service life of the original common chrome steel cold roll, and the roll body case hardness of the cold roll can be up to 97-105 HSD.

Description

technical field [0001] The invention relates to a cold rolling roll and a manufacturing method thereof, in particular to a cold rolling roll for rolling lithium battery protection plates and a manufacturing method thereof. Background technique [0002] As people's requirements for fast and convenient travel methods become stronger and stronger, the use of electric bicycles as a means of transportation is becoming more and more common. The power output of electric bicycles mainly depends on batteries. Currently, the batteries used in electric bicycles mainly include lead-acid batteries and lithium batteries. Traditional batteries are mostly lead-acid batteries, but due to the heavy weight of lead-acid batteries, it is inconvenient to disassemble and transport, and it is easy to cause environmental pollution. When using lithium batteries, which are efficient, light and pollution-free energy storage materials, the electric Bicycles became lighter and therefore more and more po...

AI Technical Summary

Problems solved by technology

[0003] The lithium battery protection board required for the production of lithium battery needs to work stably for a long time in the environment of -20 ~ 60 ℃, so the quality requirements for the lithium battery protection board are high, and the quality of the cold roll used in the production of the lithium battery protection board The requirements are getting higher and higher. Lithium battery protection plates are usually produced by two-roll rolling. At present, the materials used to manufacture cold rolls in the domestic and foreign markets are mainly Cr2, Cr3, and Cr5 series. During the rolling process, cold rolls and Slipping occurs between the rolled materials; shortly after being put into production and use, the surface roughness of the cold rolls decreases sharply, which affects the surface quality of the product and the product qualification rate. These phenomena are mostly due to the poor wear resistance of the cold rolls, Caused by poor surface roughness retention