What a press brake does in a fab shop
A press brake, called a brake press or bending press on the shop floor, is the machine that puts the bend in sheet metal. An upper tool, the punch, drives the blank into a bottom die to form a flange, and the depth of the ram stroke sets the bend angle, from one clean flange to a tight multi-bend part. That is how enclosures, cabinets, brackets and formed parts get made for job shops, vehicle building and sheet metal fabrication. KNUTH USA carries press brakes in conventional and CNC versions and in a range of sizes.
How a press brake forms a bend
The blank sits on the die, the ram brings the punch down, and the punch drives the material into the die opening. Most work is air bending: the punch only dips in far enough to hit the target angle, without bottoming the part into the die. Ram depth sets the angle, and going deeper closes it up, so any open angle can be dialled in without swapping tooling. Two things drive accuracy on the part:
- Crowning: the ram deflects a little under load, and crowning compensates for it so the bend angle holds from end to end.
- Angle measurement: CNC brakes check and correct the angle as the bend is made, which is how they hold tight repeatability.
How long a bend you can run and how much tonnage you need come down to gauge and alloy. The rated capacity for each machine on offer is listed on the product cards above.
Conventional vs. CNC press brake: which one to buy
KNUTH press brakes are hydraulic, and the control is what sets them apart:
- Conventional press brake: the back gauge and ram depth are set by hand. Rugged, simple to run and cost-effective for straightforward flanges and short runs.
- CNC press brake: the control drives the back gauge, tonnage and bend angle from a program. Setup time drops, the angle repeats part to part, and it earns its keep on complex work and longer runs.
Rule of thumb: simple, repeating flanges point to a conventional machine; complex parts and volume point to a CNC brake.
Capacity and machine sizes
Two numbers steer the pick. Working length has to cover your longest flange, and tonnage has to cover the mix of gauge and alloy. Heavier gauge and longer flanges call for more tonnage. KNUTH USA carries press brakes from a compact unit for the maintenance shop up to a long, high-tonnage CNC machine for structural work. Add a programmable back gauge for repeatable positioning, crowning for an even angle, and guarding to protect the operator. The rated numbers for each series are on the product cards above.
Tooling, dies and accessories
The tooling makes the part on a press brake. Punch and die set the angles and inside radii you can hit:
- Punches in a range of tip radii and styles, including tooling for tight and multi-bend work
- Dies with a range of V-openings to match the gauge
- Quick-clamp systems to speed up a tooling change
Which tooling you need depends on your material and your bends. Punches, dies and accessories go on the same quote as the machine.
Industries and shop types we supply
Press brakes run in a lot of shops. Typical parts and buyers include:
- Enclosures, cabinets and panels in machinery and equipment building
- Brackets, angles and formed parts in metal fabrication and structural steel
- Components for trailers, truck bodies, HVAC and ductwork
To cut blanks ahead of bending, KNUTH USA supplies guillotine shears, and for bending without swapping tooling, folding machines.
Why KNUTH USA
KNUTH is a machine tool supplier, not a machine builder. We pick proven series, run a documented inspection to European testing standards before shipment, and that paperwork is available on request. Machine stock and the parts warehouse sit in Lincolnshire outside Chicago, and Houston covers the southern territory with sales and service. You deal with a US point of contact, get advice on working length, tonnage and tooling instead of a catalog pick, and can see a machine in person. For the full lineup, see the sheet metal processing machines category.
Service, parts and lead times
After the sale the Americas service team looks after the machine, backed by parts and technical support from Germany. Parts supply is committed for ten years across the company. Installation, startup and operator training can be arranged on request, with the scope spelled out on the quote. Reach us through the contact page for help sizing a brake, choosing tooling or checking availability.
Further Machine Categories at a Glance
Browse the rest of the KNUTH USA machine program below. Pick a category to see the individual machines and their specs.
