Fire prevention it bites and the frame production production frame which it bites

摘要

The present invention is a fire door relates to a door frame manufactured mold frame for forming recessed bending groove on an upper surface having an angle corresponding to the projection and bent in the lower portion of the press punch and the bottom surface has a curved surface bent groove, the inclined surface, the upper die to continuously form the level difference installed in the lower portion of the press punch, and the vertical plane to the curved bending groove, the inclined surface, the upper surface makes contact with the step portion, the inclined surface, formed to correspond to a stepped portion, and the bottom face of 'Z' shape is a bent inclined surface inclined at a 45 ° angle and installing the intermediate die for forming the lower portion of the upper die, installed on the lower portion of the middle mold and an upper surface of the lower mold forming the mold bent surface formed inclined to the 'Z' shape the 45 ° angle corresponding to the bent inclined surface made, including has a feature that can be bent without forming the metal plate constituting the fire door stuck in length. ; Doors and door frames mold production mold, punch press, the upper mold and the middle mold, lower mold, bending mold surface for upper secondary mold, utility pneumatic cylinder.