CNC Press Brake Bending
Equipped with a CNC backgauge with position feedback. We adjust automatically to material springback profiles, ensuring perfect bend repeatability on SPCC, SGCC and AL5052 sheets. Our CNC press brakes handle everything from simple 90° folds to complex multi-step bending sequences. Our bending cell runs a TOPSEN TR/TM 10030 — 100 t nominal force, 3100 mm bending length, ±0.02 mm ram positioning and ≤0.02 mm backgauge repeatability.
CNC press brake bending forms flat sheet into 3D parts by clamping the blank over a die and driving a punch to a programmed angle. Our TOPSEN TR/TM 10030 holds ram positioning to ±0.02 mm and repeats the backgauge to ≤0.02 mm across a 3,100 mm bending length for multi-flange parts. Bend sequence and springback compensation are set per material and thickness.
What is the minimum bend radius I should design for?
Use a radius at least equal to material thickness for annealed and H32 aluminium, and 2–4 × thickness for 6061-T6, which cracks easily. Stainless 304 typically bends at 1T. Tighter radii are possible with special tooling but add cost and risk, so specifying 1T where function allows is the single cheapest DFM change available.
How do you hold angle tolerance across a batch?
Every material and thickness combination springs back by a different amount, so the brake is programmed with a measured compensation value rather than a target angle. First-piece inspection confirms the angle before the batch runs, and the same program is reused on repeat orders so part-to-part variation stays inside ±0.5°.
CNC press brake bending: standard design rules
| Design rule | Recommended value | Failure mode if ignored |
|---|---|---|
| Minimum bend radius (5052-H32) | 1 × thickness | Cracking on the outside of the bend |
| Minimum bend radius (6061-T6) | 2–4 × thickness | Severe cracking — avoid bending T6 where possible |
| Minimum flange length | 4 × thickness + bend radius | Blank slips off the die and the angle is lost |
| Hole-to-bend distance | ≥ 2 × thickness + bend radius | Holes distort into ovals near the bend line |
| Bend relief | Width ≥ thickness, length ≥ radius | Tearing at the end of the bend line |
Common questions about CNC Press Brake Bending
Why did my bent part come back with cracked corners?
Almost always the bend radius is too tight for the alloy, or the bend line runs parallel to the material grain direction. Both concentrate strain on the outer surface. Rotating the blank 90 degrees on the sheet or opening the radius to 1T normally solves it without changing the function of the part.
Can you bend parts longer than 2 metres?
Yes. Our press brake takes a 3,100 mm bed with a CNC backgauge at ≤0.02 mm repeatability, which covers most enclosure and chassis work. Longer parts can be formed in sections or moved to a different setup; send the flat length with your RFQ and we will confirm the approach.
Do I need to supply a bend allowance or flat pattern?
No. If you send a 3D STEP file we calculate the flat pattern using the K-factor for your specific material and thickness, then return the DXF for confirmation. If you already have a proven flat pattern, send it and we will match it exactly.
Materials we run this process on
Related capabilities and next steps
Specifications
Capabilities
Sheet metal engineering guides
Minimum Bend Radius ChartThe tightest bend you can form without cracking, listed per metal in multiples of thickness (×t), plus the factors that change it and how to choose.Read More
DFM for Sheet Metal: Essential Design Rules That Save Cost and Prevent Production FailuresDesign-for-manufacturing rules for sheet metal — minimum hole sizes, bend radii, edge distances, tab-and-slot design, and common mistakes that cause scrap.Read MoreReady to get started?
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