Analysis of thin strip edge drop formation during cold rolling process

ABSTRACT

In order to produce a thin non-oriental silicon steel strip with high surface quality, the hot rolled strip needs to undertake a large reduction by cold tandem rolling process. As a result of thin strip rolling, the rolling pressure is concentrated on a small area of the work roll surface causing a large elastic deformation. Because of the transverse thickness distribution of strip is strongly dependent of roll’s shape, it is imperative to consider work roll’s non-circular shape. By relaxing the Hitchcock assumption, vertical displacement of work roll surface is calculated in both rolling and transverse direction. By assuming the thickness of strip does not increase when rolled, a Slab method is implemented to calculate roll pressure due to work roll’s shape. Combined with Influence Function Method for loads distribution between stacked rolls, the proposed model can predict thin strip transverse thickness profile with a good accuracy compared with industrial data under varied conditions. Five-pass cold reversal rolling process is investigated by the validated model. It is revealed that the transverse thickness deviation can be effectively reduced by decreasing the entry thickness of strip.

KEYWORDS:

• Non-oriented electrical steel
• cold strip tandem rolling
• edge drop

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

Research is supported by National Natural Science Foundation of China (Grant No. 51975043 and No.51604024), Beijing Natural Science Foundation (No. 3182026), Fundamental Research Funds for the Central Universities (Grant No. FRF-TP-19-002A3)

Notes on contributors

Xiawei Feng

Xiawei Feng is a PhD graduated from University of Science and Technology Beijing, majored in Mechanical Engineering. Xiaochen WANG is associate professor at University of Science and Technology Beijing, his research interest is flat sheet rolling. Jiquan SUN is professor at University of Science and Technology Beijing, his interest is metal forming process. Quan YANG is professor at University of Science and Technology Beijing, his research interest is quality control of sheet rolling. Zedong WU is a PhD candidate from University of Science and Technology Beijing, majored in Mechanical Engineering. Yuhua GUO is a Master degree student from University of Science an Technology Beijing.