English
русский
???????
Fireproof and Disaster-resistant Door Technology
Published Time:
2025-09-25
Material & Gauge Selection
Door leaf and frame components are fabricated from hot-dipped galvanized steel sheet to EN 10346 or ASTM A653, typically 1.2 mm – 1.5 mm thick for integrity and 0.8 mm – 1.0 mm for stiffeners. Zinc coating ≥ Z275 g/m2 guarantees corrosion resistance after bending without micro-cracking.
C N C Press-Brake Setup
? Machine: 6-axis C N C press brake (±0.1° repeatability, 320 kN – 500 kN).
? Tooling: 28 mm gooseneck punch paired with 60° die opening; tip radius 0.8 t to avoid stress concentrators that could compromise fire resistance.
? Back-gauge: Servo-driven fingers with ±0.05 mm positioning to maintain cumulative tolerance ≤ 0.3 mm on leaf perimeter—critical for intumescent seal compression.
Bend Sequence & Spring-Back Compensation
? Air-bending at 85° to counter 3–5° spring-back (typical for 1.5 mm Z275 steel).
? Sequence: outer frame → hinge reinforcement channels → lock pocket. Each bend is under-cut 0.2 mm on flange length to guarantee positive fit-up before MIG welding, minimizing weld distortion that could jeopardize fire seal alignment.
Compliance Checks
? Dimensional: diagonal difference ≤ 1 mm (EN 1634-1).
? Micro-cracking: 10× magnified visual inspection on outer radius; zinc layer intact, no substrate exposure.
? Angle: sampled 1 per 50 parts; SPC chart maintained for CE/UL traceability.
Post-Bend Treatment
Edges are vibratory-deburred to remove shear burrs < 0.1 mm, preventing hot-spot corrosion and ensuring uniform intumescent seal adhesion. Parts are then alkaline cleaned and zinc-phosphate pretreated prior to epoxy-powder coating (min. 60 μm) for 240 min fire rating compatibility.
Outcome
The above protocol yields leaf and frame components that maintain < 1 mm gap under 500 °C deflection tests, satisfying EN 1634-1 (120 min) & UL 10C (90 min) requirements while enabling clean intumescent seal closure.
DO YOU HAVE QUESTIONS?
Get In Touch With Us!
Fax:+86-0750-8307801
Add:Heshan City, Republican Town, Tiegang Industrial Zone II
Scan to chat
with customer service
COOKIES
Our website uses cookies and similar technologies to personalize the advertising shown to you and to help you get the best experience on our website. For more information, see our Privacy & Cookie Policy
COOKIES
Our website uses cookies and similar technologies to personalize the advertising shown to you and to help you get the best experience on our website. For more information, see our Privacy & Cookie Policy
These cookies are necessary for basic functions such as payment. Standard cookies cannot be turned off and do not store any of your information.
These cookies collect information, such as how many people are using our site or which pages are popular, to help us improve the customer experience. Turning these cookies off will mean we can't collect information to improve your experience.
These cookies enable the website to provide enhanced functionality and personalization. They may be set by us or by third-party providers whose services we have added to our pages. If you do not allow these cookies, some or all of these services may not function properly.
These cookies help us understand what you are interested in so that we can show you relevant advertising on other websites. Turning these cookies off will mean we are unable to show you any personalized advertising.