Rolling method for variable-thickness car B column

The invention relates to a rolling method for a variable-thickness car B column. The rolling method comprises the following steps of: selecting an aluminium-coated silicon material as a car B column raw material, adopting a steel plate rolling method to roll, controlling rolling speed in a rolling process to be 4-15m/min, controlling rolling force to be 3000-7800 KN, controlling a roller seam to be 0.9-2.5 mm, controlling and regulating spacing of rolling rollers in real time, and obtaining a board which continuously changes according to a customized thickness in a rolling direction. Comparedwith the prior art, the rolling method has the following beneficial effects that: firstly, the variable-thickness board is free of a welding seam and is good in surface quality; secondly, a transitionregion is used to replace the welding seam, and connecting strength is greatly improved; thirdly, continuous production is realized, production efficiency is high, and thickness assembly is flexible;fourthly, the transition r