Steel security door section and hemming process

Abstract

The invention relates to a steel security door leaf and a crimping process thereof. The steel security door leaf comprises a front door plate and a rear door plate, wherein a door core is filled in a cavity between the front door plate and the rear door plate. The steel security door leaf is characterized in that the side part of the front door plate is folded for 180 degrees inward, so as to cover the edge of the rear door plate, and form a three-layer sandwich-shaped fitted covered edge. The covered edge and the main body of the front door plate form a bending angle larger than and equal to 45 degrees. The crimping process comprises the following steps: (a), the side part of the front door plate is bent upwards, and the bending angle is larger than and equal to 90 degrees; (b), one open side of the cavity of the rear door plate is stuck to one side towards which the side part of the front door plate is bent, and the convex edge of the rear door plate is fitted with the front door plate; (c), the bent part of the front door plate is folded inwards, so as to cover the convex edge of the rear door plate, and the three-layer sandwich-shaped fitted covered edge is formed; and (d), the three-layer sandwich-shaped fitted covered edge is bent towards the inverse direction of the opening of the cavity of the rear door plate, and the overall bending angle is larger than and equal to 45 degrees. The steel security door leaf and crimping process have the advantages that the overall structural performance of the door leaf is good, and the strength is high; and the crimping process can avoid the spot welding process step.

Description

technical field [0001] The invention relates to the technical field of safety doors, in particular to a steel safety door and its hemming process. Background technique [0002] Existing safety doors are generally made of steel materials, including the front door panel and the rear door panel, and the cavity of the rear door panel is filled with door core materials. Because the current safety doors are required to have a certain fireproof function, the door core materials are all made of Made of refractory materials. The front door panel and the rear door panel are generally combined in this way: the edge of the front door panel is turned inward to form a card slot parallel to the front door panel, and a convex edge is provided on the opening side of the cavity of the rear door panel, and the convex edge is inserted into the card slot of the front door panel. In the slot, the flange of the rear door panel and the slot of the front door panel are snapped together. The door l...

AI Technical Summary

Problems solved by technology

Therefore, before the surface of the door leaf is painted, the door core material has been installed in the door leaf. If the painted door leaf is baked at high temperature to speed up the paint curing speed, the fire performance of the door core material will inevitably be reduced, which will affect the fire resistance of the door leaf. Safety; if the paint is not baked at high temperature, the curing time of the paint will be longer, and the production efficiency will be greatly reduced

[0004] It can be seen that the safety door leaf in the prior art needs to be fixed and strengthened by spot welding between the front door panel and the rear door panel. Such a door leaf has poor overall structure and affects the strength of the door leaf.

The existing curling manufacturing process of the safety door leaf is easy to leave welding scars on the door leaf, which affects the aesthetics of the door leaf, and the production efficiency is low

Images