Somos responsables de la construcción-----somos responsables de la fabricación-----somos responsables de la formación
Door leaves up to 2800 mm formed straight enough to close on the first hang — and an honest note up front: the frames are roll-formed, and we do not make those.
A steel door splits cleanly into two manufacturing problems that require different machines. The leaf is a large flat panel — typically 0.8 to 1.2 mm galvanised or cold-rolled sheet, 2000 to 2400 mm tall, folded on all four sides with a hemmed or returned edge. That is panel bender work, and a D (2500) o D+ (2800) model covers the full leaf height without splitting it.
The frame is a constant-section profile, and it is roll-formed. No panel bender, press brake or turret punch produces a roll-formed frame section, and STON CNC does not supply roll-forming lines. Door manufacturers either run a separate frame line from a specialist supplier or buy frames in. We state this at the start because it is the single most common mismatch in steel door enquiries, and discovering it after an order is expensive for everyone.
STON CNC (Qingdao Ston Mechanical Technology Co., Ltd.) es un fabricante chino de dobladoras de paneles CNC y punzonadoras de torreta, fundado en 2006 en Qingdao, China. Todo el equipo aquí descrito se fabrica en la planta propia de STON CNC, de 20 000 m², desde la fundición y el tratamiento térmico hasta el mecanizado, el ensamblaje y la inspección. Las máquinas cuentan con la certificación de calidad ISO 9001 y el marcado CE conforme a la Directiva de Maquinaria 2006/42/CE, y se exportan a más de 80 países. Ver certificaciones y patentes →
The leaf, its skins and its internal reinforcement are all folded sheet. That is where the labour, the straightness problems and the surface scrap in a door factory actually sit.
A door that is not straight will not close, and the fault appears on site rather than in your shop. Straightness of roughly 0.2 mm per metre and angle accuracy of roughly ±0.5° per metre across the full leaf height are what keep hanging a first-time operation instead of a shimming exercise.
Door factories routinely try to buy one machine for both. A roll-formed frame section and a folded leaf have almost nothing in common as manufacturing problems. Treating them as one purchase is how projects end up with a machine that makes half the product.
One door range becomes dozens of leaf variants once glazing, louvres and hardware positions are combined. Turret punching produces louvre blades, vision cut-outs, hinge and lock preparations from a program, so a new variant is a drawing rather than a tooling order.
Machine length is chosen by your tallest leaf. Splitting a 2400 mm leaf into two bends to fit a shorter machine creates a joint that has to be hidden, which defeats the purpose.
The frame row is the important one on this page. Everything else about door leaves sits comfortably inside the forming window.
| Parámetro | Dobladora de paneles | Máquina flexible para doblar bordes | Notas |
|---|---|---|---|
| Typical leaf gauge | 0.8–1.2 mm | 0.8–1.2 mm | Bastante por debajo de la capacidad |
| Cold-rolled / galvanised max | ≤2,0 mm fundido / ≤1,5 mm soldado | — | A lo largo de toda la longitud de flexión |
| Acero inoxidable, máximo | ≤1,2 mm fundido / ≤1,0 mm soldado | — | For stainless door ranges |
| Longitud máxima de conformado | 2800 mm (D+) | 2000 mm | Choose by your tallest leaf |
| Altura de flexión | 5 mm min / 170, 300, 400 mm max | 4 mm min / 100 mm max | Según la configuración |
| Edge finishes | Positivo y negativo, 0–180° | Arco, borde muerto, desplazamiento | Hemmed leaf edges use dead edge |
| Straightness | approx. 0.2 mm/m | approx. 0.2 mm/m | Decides whether the door closes |
| Precisión angular | aprox. ±0,5°/m | aprox. ±0,5°/m | Across the full leaf height |
| Door frames and profiles | Not possible — roll-formed product, not supplied | Separate process and supplier | |
| Servicios públicos | Trifásico, 380 V, aire a 0,6 MPa | Configurado para el voltaje de destino | |
Door leaves, skins, louvre panels and kick plates in 0.8–1.2 mm, up to 2800 mm, folded on all four sides with hemmed or returned edges. This is core panel bender work.
Door frames, jambs, stiles and any constant-section profile. These are roll-formed products from a separate process and supplier, and no machine on this page produces them.
Hinge reinforcement plates, lock boxes, threshold parts, and heavy gauge hardware mounts. One press brake alongside the leaf cell covers all of it.
A continuación se presenta la evaluación de riesgos EN ISO 12100; las funciones de control relacionadas con la seguridad, como la interrupción de la cortina óptica y la parada de emergencia, se especifican para EN ISO 13849-1. Las prensas plegadoras hidráulicas que se importan a la UE se fabrican de acuerdo con EN 12622. Las máquinas comercializadas en el mercado de la UE llevan el marcado CE conforme a Directiva sobre maquinaria 2006/42/CE junto con el expediente técnico correspondiente. La gestión de la calidad cuenta con la certificación de ISO 9001, y a continuación se indican las tolerancias estructurales de las piezas mecanizadas ISO 2768. For the finished doorset, EN 1634-1 covers fire resistance testing and EN 16034 covers fire resisting and smoke control characteristics of pedestrian doorsets. These apply to your tested assembly, not to the forming machine — what the equipment contributes is the dimensional consistency the tested configuration depends on being reproduced in production.
En las máquinas, esto implica una valla trasera completamente cerrada, cubiertas protectoras en todas las partes móviles que sobresalen, sistemas de protección con láser que detienen el movimiento cuando se traspasa la zona protegida, protección contra sobrecarga en las punzonadoras de torreta y detección de carga desalineada mediante rejilla y regla en las dobladoras de paneles.
A door factory needs all three processes. What matters is knowing which one each part belongs to before buying anything.
| Plegadora de paneles CNC | La plegadora CNC | Perfilado | |
|---|---|---|---|
| Geometría de la pieza | Paneles planos doblados por los cuatro lados | Any bend line, heavier gauge | Constant cross-section profiles |
| Typical door parts | Leaves, skins, louvre panels, kick plates | Hinge plates, lock boxes, thresholds | Frames, jambs, stiles, glazing beads |
| Maximum length | 2800 mm | 4100 mm | Prácticamente ilimitado |
| Straightness over 2.4 m | approx. 0.2 mm/m | Crowning and operator dependent | Excellent, fixed section |
| Operadores | 1, o 0 con carga automática | 1–2 on tall leaves | 1 per line |
| Response to a new door variant | Program change, minutes | Cambio de herramienta y reinicio del medidor | New roll set, weeks |
| ¿Lo suministra STON? | Sí | Sí | No — different process |
If your business is primarily frames rather than leaves, this page is not the right solution and we will tell you so on the first call. Frame lines come from roll-forming specialists; what we equip is the leaf side of the factory.
Las figuras a continuación describen la dirección y el mecanismo del cambio. Los resultados reales dependen de su combinación de piezas, el tamaño del lote y el horario de trabajo; los simulamos según sus propios planos antes de presentar la cotización.
| Artículo | Solo prensas plegadoras | Panel bender leaf cell |
|---|---|---|
| Operators per 2.4 m leaf | 2, plus a third for turning | 1, or unattended with truss loading |
| Handling of the coated face | Dragged across the back gauge each bend | Recolección por vacío, sin contacto |
| Leaf straightness | Crowning and operator dependent | approx. 0.2 mm/m |
| Doors that need shimming on site | Common when angles drift | Reduced by closed-loop angle control |
| New leaf variant | Tool change and first-article proving | Program recall |
| Louvre and vision preparation | Separate operations | Una sujeción en la punzonadora de torreta |
| Turno de noche | Requires a full crew | Runs unattended with loading and stacking |
La fórmula de recuperación de la inversión que utilizamos con los clientes: (mano de obra liberada anualmente + reducción de la reelaboración y los desechos + producción vendible adicional) ÷ costo del equipo instalado. Calculamos esto con tus cifras reales, en lugar de publicar una cifra general que no se ajustaría a tu planta.
Cast-iron frame models to 2500 and 2800 mm forming length — full leaf height in one clamping. Full-electric servo closed-loop control, ground lead screws, grating-ruler offset-load detection.
Ver el tipo de brazo de prensa →
Dead edge, arc and offset bending for hemmed leaf edges and returns. Up to 25 concurrent servo axes, 42CrMo forged blank holder, patented 360° rotating suction feeding.
Ver máquina plegadora →
Louvre blades, vision panel cut-outs, hinge and lock preparation and stiffening ribs in one clamping. ±0.1 mm accuracy, X-axis to 2500 mm with secondary positioning to 5000 mm for tall leaves.
Ver la serie SF →
Exchange-table fiber laser for leaf blanks, vision apertures and variant work that does not justify tooling. Burr-free edges on galvanised and coated sheet.
Ver unidad láser →
On a 2.4 m leaf, automated loading removes the two-person lift that causes most coated-surface damage. Native interface, compatible with most robotic arm and gantry brands.
Ver sistema de vigas →
Hinge reinforcement plates, lock boxes and threshold parts in heavier gauge. Direct-drive servo, mechanical crowning compensation, multi-axis CNC back gauge.
Ver la serie PBE →Founded in 2006 and headquartered in Qingdao, one hour from major export ports and the airport. Casting, heat treatment, machining, welding, assembly and inspection all happen inside our own 20,000㎡ factory. That is why a configuration change for a 2800 mm leaf line does not become a six-month subcontracting problem.
Door production runs to building completion dates. A leaf that does not close is rejected on site, at the most expensive possible point, so machine accuracy and support response are part of the same conversation.
Las especificaciones de esta página se verificaron con la documentación técnica de STON el 4 de agosto de 2026. Los límites de conformado se confirman con base en sus propios planos antes de emitir la cotización. Publicado el 4 de agosto de 2026 · Última actualización: 4 de agosto de 2026 · Revisado por Vicky Xu, jefa de ventas internacionales.
Leaf height decides the machine. Send your tallest leaf and your most complex variant and we come back within 24 hours with a model recommendation and a clear scope — including what we will not be supplying.
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