| 摘要 |
PURPOSE: A bending mold for the frame of a fire door is provided to enhance the quality of a product and to manufacture various shapes of fire-door frames by cutting metal plates and forming the cut metal plates. CONSTITUTION: A bending protrusion(21) bending a metal plate is protruded from the lower end of a bending punch(20). A mounting groove(31) is formed on the upper part of an upper mold(30). On the lower part of the upper mold are successively formed an upper slope, an upper bending protrusion and an upper right-angled groove. The bending groove(41) of an upper auxiliary mold(40) is inserted into the mounting groove of the upper mold. On the lower part of a middle mold, a multi-level middle right-angled side and a middle tilt piece are formed. |
