... , door frame, rack, stud & track, c/z/u purlin, etc Light Steel Keel Roll Forming Machine The machine is used to ... -forming steel frame as required, such as light-gauge steel, door and window frame, cable bridge, electric cabinet column, guardrail plate, etc ... --> leveling --> roll forming--> hole punching (optional) --> calibrating--> automatic cutting --> output Light Steel Keel Roll Forming Machine