| 摘要 |
PURPOSE: A method for producing a door frame is provide to form a protrusion portion on an inserting hole of a sealing member in the complex door frame receiving plural doors and to manufacture the door frame by repeatedly pressing and bending without welding. CONSTITUTION: A bending groove is formed by firstly pressing after locating a complex door frame between a lower mold and an upper mold. Then, the complex door frame is secondly pressed to adhere plate faces each other by removing the bending groove. Therein, a portion of the attached plate face is protruded inside by forming a protrusion unit(140). An insert groove(130) is formed by bending at right angle a first face(120), and the both end portions are bent to form a support space. Then, A rear end of a second face is bent to produce the complex door frame having a single forward and backward.
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