FlowMarket
Where to find press brake and bending services: FlowMarket is a B2B sourcing network powered by an AI agent. You describe the part — material, thickness, longest bend, angle tolerance, quantity and whether you are supplying blanks — and the agent matches you with shops whose brake length, tonnage and tooling suit the job, then requests quotes and lead times so you can compare them in one place.
Sourcing bending work
Bending is the step where sheet metal parts most often go wrong, and almost always for the same reason: the drawing and the machine were never introduced. A design that assumes a 1 mm inside radius when the shop's standard tooling produces 2 mm will come back out of tolerance, or come back with a tooling charge nobody budgeted for.
It is also the step buyers most often try to buy in isolation, sending laser blanks from one supplier to a bender down the road. That works, and it costs a handover, a freight leg and somebody to own the dimensional result when the flat pattern turns out to have been calculated with the wrong bend allowance. Worth doing deliberately rather than by accident.
What the machine actually limits
- Bed length — the longest bend the machine can make in one hit. A 3 m panel needs a 3 m brake, and stepping a bend leaves a visible witness line.
- Tonnage — force required rises with thickness and material strength and falls with die opening. Thick stainless on a light brake is simply not possible, however long the bed.
- Tooling library — punch radii, die openings, gooseneck and special tools. What is on the shelf determines your achievable inside radius and how deep a return flange can be.
- Backgauge and axes — the number of controlled axes decides how complex a part can be positioned repeatably. Complex multi-bend parts need more than a two-axis gauge.
- Handling — large panels need follower supports or two operators. A shop without them will decline or price the labour in heavily.
Designing bends that can be made
Four rules remove most bending problems. Use the shop's standard inside radius rather than a nominal value from CAD. Keep flanges long enough to clamp — roughly four times material thickness plus the radius, below which the part cannot be held. Keep holes and cut-outs far enough from the bend line that they do not distort, again around three times thickness. And specify angle tolerance only where the assembly needs it, because ±0.5° and ±2° are different setups and different prices.
Springback is the other design factor, and it grows with material strength. High-strength and stainless grades spring back noticeably more than mild steel, which is why a part that works in S235 may need a tooling or process change in S700. Say what the material actually is, not just its thickness.
Air bending, bottoming and coining
Most work is air bent: the punch does not press the material fully into the die, so one tool set produces a range of angles and tonnage stays low. It is flexible and cheap, and the angle depends on machine accuracy and material consistency.
Bottoming presses the material into the die for a more repeatable angle at higher force. Coining goes further, plastically deforming the bend zone for very tight angular tolerance and a smaller radius — at several times the tonnage and with dedicated tooling. If your drawing calls for a tight angle on thick material, expect the process, and the price, to change.
What bending costs
Bending is priced per bend and per handling, not per part, which is why a simple box with eight bends can cost more than a complex profile with three. Setup dominates small batches: the same part is far cheaper at 200 pieces than at 5, because the tooling change is amortised. Special tooling, when the geometry demands it, is a one-off cost worth identifying before the drawing is frozen.
If you are supplying blanks, ask explicitly who owns the flat pattern. A bender working to your development will not accept dimensional responsibility for the formed part, and a bender generating their own needs the 3D model rather than a DXF.
How the AI agent matches suppliers
The agent reads your requirement rather than your keywords. It searches the FlowMarket network and connected industrial directories together, scores every candidate on how well it answers what you described — material, thickness, bend length, tolerance, quantity, geography — and drops anything that does not clear the bar. Each match comes back with a plain-language reason, which is more useful than a machine list for telling whether a shop can hold your angle on your material.