MANUFACTURING METHOD OF HAT BEAM HAVING OPENING IN PREDETERMINED INTERVAL

摘要

PURPOSE: A manufacturing method of hat beam having openings in a regular interval is provided to guide the complete synthesis movement of an opening and bottom plate. CONSTITUTION: A manufacturing method of hat beam having openings in a regular interval comprises the next step. A steel plate, having holes(112a) at a regular interval, is roll-formed and pressed. The steel plate is bent to include a rib unit(113) and a two side wall unit(112). A web member(11) has holes on two side wall unit at a regular interval. A bottom flange member(12) is connected with a rib part.