| 摘要 |
PURPOSE: A method is provided to produce the stainless lower door frame of a fireproof door which is for easily going in and out, integrally formed and has a protrusion by pressing a stainless material. CONSTITUTION: A pre-protrusion is formed for forming a folding unit on a stainless plate using an acute metal mold. A protrusion is formed for supporting a fireproof door by pressing the folding unit. A space is formed for folding the lower part of the protrusion using the acute metal mold. The space inserts a protector of the fireproof door. Then, both ends of the stainless plate are folded inward by a strut with a 90 degrees metal mold. Finally, a side unit and rear slant unit are formed by pressing the stainless plate.
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