Durmazlar SKY22 Press Brake: CNC Bending, Simulation and Programming

What Is the Durmazlar SKY22 Press Brake?

The Durmazlar SKY22 (Durmazlar SKY22 Press Brake) is a powerful member of the high-tonnage CNC press brake (bending) machine series. With a 220-ton Durmazlar SKY22 bending capacity and a wide working length, it is the preferred choice for medium and heavy sheet metal processing applications. The SKY series is Durmazlar’s premium press brake family, delivering long-running, uninterrupted operating performance on industrial production lines.

The SKY22 press brake delivers superior performance particularly in bending steel, stainless and aluminium sheets over 3 mm thick. It is used with confidence in large-scale sheet metal projects across the heavy industry, defence, energy and construction sectors.

SKY22 Press Brake Technical Specifications

• Bending capacity: 220 tons
• Working length: 3,100 mm (optional 4,100 mm)
• Stroke: 300 mm
• Open height (daylight): 500 mm
• CNC control: Delem DA-69T / DA-66T / ESA S660
• Number of axes: Y1, Y2, X, R (+Z1, Z2 optional = 6 axes)
• Crowning: Motorised automatic crowning
• Rapid approach: 120 mm/s, bending speed: 12 mm/s
• Return speed: 100 mm/s

Thanks to the SKY22’s high tonnage, steel sheets up to 6 mm thick can be bent along a 3-metre length in a single stroke. The motorised crowning system compensates for the centre-to-edge angle deviation even on long parts.

CNC Bending Programming and Offline Simulation

On the SKY22 press brake, CNC bending programming is performed using two methods: manual CNC programming on the machine and offline bending simulation on a computer. For high-tonnage and complex bending operations, offline simulation is critically important.

The Metalix cncKad software provides fully compatible post-processor support for the SKY22. The offline programming process consists of the following steps:

1. CAD file transfer: STEP/DXF import from SolidWorks, AutoCAD or Inventor
2. Flat pattern development (flat pattern): automatic unfolding based on the K-factor and material parameters
3. Bending sequence optimisation: automatic sequencing for the fewest tool changes and minimum cycle time
4. Tonnage analysis: comparing the force required for each bending step against the SKY22 capacity
5. Collision check: part-tool-machine body collision analysis in 3D simulation
6. Tool selection: V-die opening, punch radius and special tooling configuration
7. CNC program output: generation of the program file with the SKY22-specific post-processor

Tonnage Analysis and Die Selection

To correctly use the SKY22’s 220-ton capacity, tonnage analysis is essential. The bending tonnage depends on the following parameters:

• Sheet thickness: as thickness increases, tonnage rises exponentially
• V-die opening: narrow V = high tonnage, wide V = low tonnage (but a larger inner radius)
• Material strength: stainless steel requires 50-60% more tonnage than mild steel
• Bending length: for long bends, the total tonnage increases proportionally

As a general rule, the V-die opening should be 8-10 times the sheet thickness. For example, a 24 mm V-die is preferred for 3 mm sheet and a 32 mm V-die for 4 mm sheet. The SKY22’s wide open height (500 mm) allows the easy bending of parts with long flanges.

SolidWorks Integration and Sheet Metal Design

Designing the parts to be produced on the Durmazlar SKY22 press brake with the SolidWorks sheet metal module greatly accelerates the production process. The operations carried out in SolidWorks:

• Creating a sheet metal part: defining the bend radius, K-factor and sheet thickness
• Automatic flat pattern: flattening with the Flatten command and DXF export
• BOM (Bill of Materials): compiling the parts list and calculating material quantity
• Manufacturing drawing: producing the technical drawing with bend angles, dimensions and tolerances
• Metalix transfer: creating the bending program by importing the DXF flat pattern file into cncKad

Burak Engineering provides consultancy and freelance engineering services across the entire process, from SolidWorks sheet metal design to Metalix offline programming.

Collision Analysis and Safety

On high-tonnage machines such as the SKY22, collision analysis is mandatory for both safety and efficiency. In the 3D environment of offline simulation:

• It is checked whether the part flanges collide with the machine body
• The clearance between the tool set (die + punch) and the part is verified
• Collision-free alternative routes are found by changing the bending sequence
• The back gauge positions and Z-axis movements are optimised

Without this analysis, the risk of tool damage and part scrap is very high, especially with box sections and multi-bend parts.

Burak Engineering SKY22 Services

At Burak Engineering, we offer the following services related to the Durmazlar SKY22 press brake:

• Offline bending programming: fully simulated bending programs with Metalix cncKad
• Tonnage and tooling analysis: optimum tool selection based on material and geometry
• SolidWorks sheet metal design: manufacturable models, flat patterns, BOM and technical drawings
• Collision analysis and bending sequence optimisation
• CNC operator training: training on the SKY22 control unit and offline programming
• Remote technical support: live programming support via Zoom

For a quote and detailed information, visit our contact page.

Frequently Asked Questions