MULTI-STRENGTH HOT-PRESS FORMING METHOD USING TAILOR ROLLED BLANK, AND PRODUCT THEREOF

摘要

The present invention relates to a multi-strength hot-press forming method, and a product formed thereof. The method comprises: a step of forming a TRB by rolling a steel sheet by a desired thickness profile; a step of unrolling the TRB; a step of differentially heating the TRB; and a step of forming a product by performing hot-press forming of the heated TRB. Accordingly, weight reduction is able to be maximized by high strengthening and thickness optimization within a scope satisfying a design requirement condition of the product; the occurrence of cracking of a product is suppressed through deformation of a low-strength portion in a multi-strength area at the time of collision; and is possible to improve impact energy absorption performance.