“Established in 1885, DENN (Industrias Puigjaner, S.A.) has over 140 years of expertise in manufacturing metal forming machine tools.”

DENN: Innovation & Experience in Metalforming

standard to fully custom machines
modern, fast, safe & flexible
reliable construction & components
custom & user-friendly software
superb surface finishes
superb repeatability

DENN Tube (Cylinder) Necking-In & Closing Machines, CTA and CTA2 models

CNC controlled
user-friendly and feature-rich interactive graphical CAD-CAM programming system
smart machines with AI (Artificial Intelligence) functions
heating systems by induction, torches, friction, …
closing process without welding
optimized for Pressure Vessels, Cylinders, Bottles & related
aluminum liners, high pressure cylinders, CNG bottles, transport cylinders, fire extinguishers, racing cylinders, SCUBA cylinders, sampling cylinders, accumulators, steel cylinders, paintball cylinders, emergency breathing cylinders, military cylinders, aerospace cylinders, medical cylinders, airbag cylinders, hydrogen tanks, …
leak tight and no porosity
inert gas minimizes oxidation
remote site troubleshooting and programming
Ethernet / USB / Networking connectivity
Industry 4.0 – DENNdata
preventative maintenance software
automatic loading / unloading systems and robotics options
devices for faster setups and change-overs
safety devices for safe handling – protecting the operator and the machine
plus many other options are available to make these machines ideal for countless applications

What are our CTA tube necking-in and closing machine models?

Tube closing engineered for pressure integrity.

The CTA is a CNC metal forming machine designed for neck and bottom forming of industrial tubes.

Depending on material type, it performs controlled forming operations at elevated temperatures, using gas blowtorches or induction systems to ensure stable material forming. Programming is managed through DENN CAD-CAM, enabling precise, repeatable production cycles.

DENN machines can be integrated into automated production lines.

Benefits of the CTA models:

Reliable hot forming control: Integrated heating and temperature monitoring ensure stable forming conditions throughout the cycle.
Repeatable neck and bottom geometry: Multi-pass forming using rollers or fixed tools ensures consistent results part after part.
Engineered for pressure-tight applications: Bottom closing supported by inert gas injection to minimize oxidation and micro-cracks.
Production-ready integration: CNC-controlled cycles and programmable sequences allow seamless inclusion in industrial workflows.

DENN CTA photo

What are our CTA2 forming machine models for ogive-profile and similar type of parts?

Precision spin forming for ogive-profile and similar type of components.

The CTA2 is a CNC spin forming and shear forming lathe engineered for primarily aerospace and defense parts applications requiring exceptional dimensional accuracy and process stability.

Its dual-slide configuration increases forming control, enabling tighter tolerances, deeper programmed passes and stable material flow compared to standard configurations.

Designed for hot forming, the machine includes an integrated unloading system to support efficient production flow.

Production is managed through the latest version of DENN CAD-CAM, enabling graphical programming and cycle optimization without stopping the machine.

DENN machines can be integrated into automated production lines.

Benefits of the CTA2 models:

High-precision forming for very tight tolerances: Dual-slide control improves dimensional accuracy and stability in complex ogive geometries.
Stable hot forming performance: Controlled thermal conditions support consistent material flow during demanding operations.
Repeatable geometry in critical components: Multi-pass forming reduces variability part after part.
Production-ready configuration: Integrated unloading and CNC programming streamline cycle efficiency within critical workflows.

DENN CTA2 forming machine