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Durmapress specializes in designing, manufacturing, and selling various metal processing equipment, including bending machines, shears, punches, and laser cutting machines. The company was founded in 2014, with years of experience and technology accumulation. DurmaPress has become one of the well-known brands in China's metal processing machinery industry.
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Choosing a press brake depends on more than machine tonnage or working length. Whether you are comparing quotes or just starting your research, the right machine is the one that matches the parts you actually make.
Before selecting a press brake, you need to understand:
- what materials and thicknesses you bend
- the bending force (tonnage) your work requires
- your production volume and part complexity
- accuracy and tooling requirements
- how much automation you really need
- your budget and total cost of ownership
This guide explains the key factors to consider when choosing the right press brake — from sizing and machine types to CNC controls, price, and supplier validation — so you can move from research to a confident decision.
1. Understand Your Press Brake Requirements Before Buying
Every good press brake decision starts with your parts, not the spec sheet. Two machines with identical tonnage and bed length can perform very differently on your floor, so define your work first. Gather a representative family of parts from the last 6–12 months — not just your single largest job — and record the four factors below.
1.1 Material and Thickness
Material grade and strength matter more than the material name. Higher tensile strength means more bending force for the same thickness, and two aluminum or stainless grades can behave very differently. Record your typical thickness and your maximum thickness separately — they may point to different machines or tooling. Also note the inside radius and minimum flange you need, since both are driven largely by the die opening and interact with force.
1.2 Bend Length
Use the actual bend length, not the overall blank size. A 3 m sheet with a 1 m bend does not need 3 m of forming capacity for that bend. Base your working-length requirement on the longest bend you run regularly, and note any rare long parts separately so they don't force you to oversize the whole machine.
1.3 Production Volume and Batch Size
Match the machine to how you produce. High-mix, low-volume work rewards fast setup, flexible tooling, and offline programming. Repetitive, high-volume work rewards stable cycle time, reliable handling, and automation potential. Record annual volume, average batch size, changeover frequency, shift patterns, and operator availability — these decide later whether features like quick clamping, automatic tool changing, or robotics are worth it.
1.4 Part Geometry, Tolerance, and Surface
Two jobs with identical material and thickness can need different machines once geometry enters the picture. Consider box depth and return flanges (which demand open height and the right tool profile), offset and tapered bends, angle tolerance versus flange-length tolerance, springback that varies between material batches, and visible surfaces that must not be marked. These details determine tooling, backgauge axes, daylight, and whether you need front supports.
2. What Is a Press Brake and How Does It Work?
A press brake bends sheet metal and plate by forcing a punch (upper tool) into a die (lower tool) with the workpiece in between. The basic cycle: position the blank against the backgauge, drive the ram down so the punch forms the metal around the die, then return the ram and remove or reposition the part.
Every press brake shares the same essential components: the рама, the ram и bed, the punch and die (tooling), the backgauge, the система управления, the drive system, and the safety system.
One point causes more buyer confusion than any other: the drive system and the control system are two separate decisions. "Hydraulic" or "electric" describes how the ram is powered; "NC" or "CNC" describes how the machine is controlled. A machine can be hydraulic и CNC. Keep these two dimensions separate to avoid mismatched comparisons.
2.1 Air Bending, Bottoming, and Coining
Before you size a machine, decide how you will bend, because the method changes the force, tooling, radius, and flexibility.
- Air bending — the punch presses the sheet into a V-die without touching the bottom. A single die makes many angles; it uses the least force and offers the most flexibility, but the inside radius depends on the die opening and material.
- Bottoming — the sheet is pressed fully into the die, so the angle is set by the die. It needs more force and specific dies per angle, but improves angular consistency.
- Coining — much higher force imprints the tool geometry for the tightest, most repeatable radii. It demands far more tonnage and dedicated tooling, so never treat it as the default route to accuracy.
Your tonnage calculation must be based on the method you will actually use. Learn more in our comparison of air bending vs. bottoming vs. coining.
3. How to Size a Press Brake
Sizing is a combination of force, bend length, tooling, load distribution, and machine geometry — get this right and the rest becomes easier.
3.1 Calculate the Required Tonnage
Bending force depends on tensile strength, thickness, bend length, die opening, and method — not thickness alone. A widely used estimate for air bending mild steel это:
P
=
650 × S2 × L
V
Where (metric):
- P = bending force in kN
- S = thickness in mm
- L = bend length in meters
- V = die opening (V-width) in mm
- 575 = constant for mild steel (~450 MPa); adjust for other materials
Worked example — 3 mm mild steel, 2.5 m long, 20 mm V-die:
P
=
≈
646kN
≈
66tons
575 × 32 × 2.5
20
Then apply the corrections that matter:
- Material factor: stainless ≈ 1.5× mild steel; aluminum ≈ 0.5×. Use your actual material strength.
- Method: bottoming needs several times the air-bending force; coining far more.
- Load limits: check the machine's и tooling's rated load per length, plus concentrated- and off-center-load limits. A 100-ton machine is not made to apply all 100 tons in one short bend at one end.
- Capacity allowance: leave sensible headroom for material variation and future part
- s, but never plan to exceed rated limits. Confirm the final figure against manufacturer data.
Run your own numbers with our press brake tonnage calculator.
3.2 Choose the Working Length
Base working length on the longest bend you run regularly, plus handling margin. Then look past the nominal number: check distance between side frames (it limits how far a wide part can pass into the machine and matters when a flange extends past the housing), and weigh whether a longer machine truly adds value or just cost. If long parts are rare, a tandem setup or an outside partner may beat oversizing your main machine.
3.3 Check Stroke, Daylight, Throat Depth, and Open Height
These specs are routinely omitted from basic guides, yet they decide whether tall tooling and deep boxes are even possible:
- Инсульт — ram travel; affects deep parts and productivity.
- Daylight / open height — clearance to load tall tools and remove formed boxes.
- Глубина горла — how far a flange can reach into the machine.
Match each to your tallest tooling, deepest box, and largest return flange, and ask the supplier to prove difficult parts with simulation or a sample bend.
4. Types of Press Brake Machines
Only after you know the work and required capacity does comparing machine types make sense. Remember: drive type does not by itself determine control level, finished-part accuracy, or maximum thickness.
4.1 Hydraulic and Electro-Hydraulic Press Brakes
Hydraulic machines drive the ram with cylinders and are the workhorses of general fabrication — the widest capacity range, strong on heavy work, with a mature service and tooling ecosystem. Modern versions are usually electro-hydraulic (servo-valve controlled) for closed-loop synchronization and strong repeatability. Trade-offs: hydraulic maintenance, oil and heat management, and energy use when the pump runs continuously. Best for: general and heavier fabrication and broad capacity from one machine.
4.2 Servo-Electric and Hybrid Press Brakes
Servo-electric machines drive the ram with servo motors and ball screws — no hydraulics. They are fast, energy-efficient, quiet, clean, and precise, with low maintenance, but usually have a more limited force range, suiting thinner-gauge precision work. "Electric" refers to the drive, not the control. Hybrid machines pair a servo-driven pump with hydraulics to blend efficiency and response with higher force. Best for: precision small-to-medium parts and fast, clean, energy-conscious production.
4.3 Tandem and Automated Press Brake Systems
These solve specific problems, not every buyer's. Tandem systems synchronize two or more machines to bend very long parts (ship panels, wind-tower sections). Robotic cells automate loading, bending, and unloading for stable, repeatable part families — high output, but added cost, programming, guarding, and maintenance. Automation level is separate from drive type. See when integration pays off in our robotic press brake ROI guide.
4.4 Press Brake Types Comparison
| Тип | Best For | Преимущества | Ограничения |
|---|---|---|---|
| Hydraulic / Electro-Hydraulic | Heavy and general fabrication | High force, broad tonnage range, mature service | Hydraulic maintenance, energy use, heat |
| Servo-Electric | Precision thin-to-medium parts | Fast, energy-saving, clean, quiet, precise | Limited maximum tonnage |
| Hybrid | Mixed precision + higher force | Efficiency plus higher force | More complex than pure electric |
| Tandem | Very long / large parts | Extends bending length, synchronized | Complex setup, installation planning |
| Robotic Cell | Repetitive high-volume runs | High output, low labor per part | High cost, programming, maintenance |
5. Choose the Control System and Backgauge Axes
Buy the control capability your parts require — not the highest axis count on the brochure.
5.1 Manual, NC, or CNC Control
- Manual / basic — simple, occasional, low-precision work and prototyping.
- NC — automates basic ram and backgauge positioning with stored jobs; ideal for standard, repetitive parts.
- ЧПУ — multiple axes, multistep programs, graphical (often 3D) setup, simulation, and correction; the choice for complex, high-precision, or high-mix work.
Compare controllers on interface usability and language, program storage, CAD/CAM import, offline programming, and — often overlooked — software licensing and update costs. Modern 3D controls also help less-experienced operators, though trained staff remain essential. Unsure where you sit? Read manual vs. NC vs. CNC press brakes.
5.2 What the Main Press Brake Axes Do
Axis names matter only when you know which part problems they solve:
- Y (Y1/Y2) — ram movement and left-right synchronization.
- X (X1/X2) — backgauge depth (flange length), with independent fingers for tapered parts.
- R — backgauge finger height.
- Z1/Z2 — lateral finger positioning across the bed.
- Crowning axis — deflection compensation along the bed.
| Оси | Typical Use | Best For |
|---|---|---|
| 2-axis (Y, X) | Basic, repeatable bends | Simple parallel-flange parts |
| 4-axis (Y1/Y2, X, R) | Standard CNC bending | Most everyday fabrication |
| 5-axis (+Z or independent X) | Angled / non-parallel edges | Tapered and complex parts |
| 6-axis (X1/X2, R1/R2, Z1/Z2) | Full flexibility | High-mix shops, complex geometry |
6. Specify Accuracy and Compensation Features
Don't compare accuracy numbers until you know which number is quoted. Axis positioning accuracy, repeatability, и finished bend-angle accuracy are not the same thing. A machine can have superb axis specs and still make inconsistent parts if material, tooling, springback, temperature, or frame deflection aren't managed. Always ask suppliers to state test conditions and whether a figure is a machine spec or a measured part result.
6.1 Crowning and Deflection Compensation
Under load, the bed and ram deflect slightly, opening the angle in the middle of a long part. Коронование compensates so the angle stays consistent end to end; CNC crowning adjusts automatically per job. The longer your bends and tighter your tolerance, the more it matters. Verify by measuring the angle at several points along a representative long part.
6.2 Angle Measurement and Material Compensation
Advanced machines measure the actual bend angle during forming and correct it in a second hit, or detect thickness and adjust automatically. This is valuable when material varies batch to batch, cutting first-part scrap. It does not remove the need for correct tooling, process control, and trained operators. See our press brake crowning and angle measurement guide.
7. Select the Tooling and Clamping System
Tooling touches the part directly, so it belongs in your specification and budget — new machines almost always need new or additional tooling. Consider the tooling standard and compatibility, punch profile and die opening, sectional tooling, tool height, and load rating, plus whether your existing tooling can be reused.
7.1 Choose the V-Die Opening and Tool Profile
The V-die opening sets force, inside radius, and minimum flange at once: a larger opening lowers force and increases radius; a smaller one does the reverse and raises the minimum flange. The punch profile must clear boxes, return flanges, and prior bends. Avoid treating one "rule of thumb" opening as universal. Get it right with how to choose a V-die opening.
7.2 Manual, Hydraulic, and Automatic Tool Clamping
Clamping affects setup time, alignment, safety, and automation readiness. Manual is cheapest; quick-change (hydraulic) clamping speeds changeovers; automatic tool changing can nearly eliminate setup time — if your changeover frequency, small lots, standardized tooling, and labor situation justify it. For a shop with many daily changeovers, this can lift a stand-alone brake from ~40% utilization toward 60% or more.
8. Evaluate Productivity and Automation
A faster ram does not mean more finished parts. In real shops, actual bending time is often only 30–40% of the operator's day — the rest is setup, handling, correction, and changeover. Compare machines on the complete cycle, not headline speed.
8.1 Measure the Complete Bending Cycle
Run the same representative part on each candidate and record programming/offline time, tool loading and alignment, material handling, first-part correction and inspection, actual bend time, part removal and changeover, and scrap/rework. The metric that matters is good parts per hour under your operator assumptions — not strokes per minute on an unloaded machine.
8.2 When Automation Is Worth the Cost
Match each option to a real constraint: offline programming for frequent job changes; front supports / sheet followers for large or floppy parts; automatic tool changing for high changeover frequency; robotics for stable, repeatable families; MES/network integration where traceability matters. Justify each with labor availability, utilization, lot size, part stability, and payback — not theoretical speed.
9. Check Safety and Compliance
Treat safety as a core requirement, not a feature list. Start with a documented risk assessment for your applications. Modern machines offer point-of-operation protection (light curtains, tool-tip laser guards) that stop the ram if a hand breaks the beam; also confirm emergency stops, interlocks, safe setup speeds, and lockout/tagout. Crucially, understand what the system does not cover: secondary pinch points between flanges, or between the part and the machine, are typically outside its protection. No system makes a brake 100% safe, so training and risk assessment remain essential. Requirements depend on your jurisdiction and the current applicable standards — confirm against official standards and machine documentation.
9.1 Safety Questions to Ask the Supplier
- Which safeguarding system is included, and which options cost extra?
- How does it behave during setup, tool change, and special modes?
- Which hazards fall outside its protective coverage?
- What training, documentation, and local compliance support is provided?
- How is safety re-validated if robotics or special tooling is added?
See the full checklist in our press brake safety guide.
10. How Much Does a Press Brake Cost?
Press brake pricing spans a wide range, driven by size, controls, axes, tooling, and automation. Use these as rough market bands, not quotes:
| Machine Type | Typical Price Range |
|---|---|
| Manual press brake | $5,000 – $20,000 |
| NC hydraulic press brake | $20,000 – $50,000 |
| CNC hydraulic / servo-electric press brake | $30,000 – $150,000+ |
| High-end automated / robotic system | $200,000+ |
10.1 What Drives the Price
The biggest cost factors are tonnage и bending length, followed by the CNC controller, number of axes, оснастка, crowning and angle-measurement systems, and any автоматизация (tool changers, robots, sheet followers). Two machines of the same tonnage can differ substantially once controls, axes, and tooling are configured — which is why comparing sticker prices alone is misleading.
10.2 Calculate the Real Five-Year Cost
Compare machines on total cost over a defined period using the same assumptions for every supplier:
- Annualized capital or financing cost
- Freight, rigging, installation, and commissioning
- Tooling and clamping
- Software, licenses, and updates
- Training and labor
- Energy and consumables (oil, filters)
- Preventive maintenance, repairs, and spare parts
- Expected downtime, scrap, and rework
- Residual value
Then compare cost per good part or total annual cost — not the purchase price. Model your numbers with our press brake price.
11. Compare Suppliers and Quotations
At this stage you're comparing production solutions, not just machines. A consistent process is your best defense against a misleading quote.
11.1 What to Include in the RFQ
Give every supplier the same package: representative drawings and material specs; required tonnage, bend length, and geometry (or ask them to calculate and document it); tolerance and production requirements; proposed and existing tooling; controller, axes, compensation, safety, and software requirements; installation, training, warranty, and service scope; and delivery, commissioning, FAT/SAT, and acceptance criteria. Compare exclusions as carefully as inclusions. Use our press brake RFQ checklist to standardize your request.
11.2 Service, Warranty, and Spare Parts
Downtime is one of the most expensive hidden costs in manufacturing, so evaluate support before you buy: local and remote service coverage, guaranteed or typical response time, spare-parts location and lead time, and warranty duration with inclusions and exclusions (travel, labor, consumables). Confirm training, software support, and controller lifecycle, and ask for reference customers running similar machines on similar work.
11.3 Sample Bending, FAT, and Final Acceptance
Turn claims into proof before final payment: test representative easy, difficult, and long parts — not only supplier-selected samples. Record setup time, tool-change time, cycle time, first-part correction, and good-part output; measure angle, flange, and consistency across the bend; verify controls, axes, compensation, safety, software transfer, and tooling; and define written FAT/SAT responsibilities, tolerances, and remedies if the machine fails.
12. Real Buying Mistakes We See in Press Brake Selection
The most costly errors are rarely about the machine itself — they come from how it was selected. These are the patterns we see most often.
Sizing tonnage from thickness alone. A customer bending 4 mm stainless once chose a machine based on thickness but ignored the material's tensile strength and the die opening. On air bending, stainless needs roughly 1.5× the force of mild steel, so the "big enough" machine ran at its limit and lost accuracy. Always size from material strength, bend length, die opening, and method — not thickness.
Letting one rare part dictate the whole machine. A shop bought a long, high-tonnage brake for a job that ran twice a year, then made its everyday small parts slowly and awkwardly on it. Size around your regular work and handle outliers separately.
Confusing drive type with control level. "Electric" is not a synonym for "CNC." Buyers who assume so end up with the wrong combination of power and control.
Comparing ram speed instead of complete cycle time. The fastest ram rarely wins; setup, handling, and correction dominate the day.
Comparing spec-sheet accuracy instead of finished parts. Axis positioning numbers look precise but don't guarantee consistent bend angles.
Treating tooling, safety, installation, and training as afterthoughts. These are real costs and real risks — budget and specify them up front.
Comparing purchase price instead of installed cost and TCO. The cheapest machine is often the most expensive to own.
Buying without a sample test and written acceptance criteria. Always prove the machine on your own parts first.
13. Press Brake Recommendations by Production Scenario
Use these as conditional starting points, then validate with drawings and a sample test.
13.1 General Job Shop and High-Mix Production
Prioritize flexibility: graphical CNC with offline programming, flexible tooling with adequate open height, a 4–6-axis backgauge suited to your geometries, quick clamping (and possibly automatic tool changing), and broad tooling availability.
13.2 Precision Small- and Medium-Part Production
Prioritize consistency: a hydraulic, hybrid, or servo-electric machine within your force range, fine positioning, stable tooling, angle correction where justified, and easy program reuse. Judge on measured finished-part capability, not axis specs.
13.3 Long or Heavy Plate Bending
Prioritize force and rigidity: verified tonnage per length, a rigid frame with effective crowning, adequate working length and side-frame clearance (or a tandem setup), heavy-duty tooling, support systems, and careful foundation and safety planning.
13.4 Repetitive or Automated Production
Prioritize stable output: repeatable part presentation, offline programming, automated handling, a coherent tooling strategy, proper guarding, and a payback built on good parts and labor — not theoretical speed.
14.FAQ
Size = tonnage + bend length + material. Calculate the force for your thickest regular material at your longest regular bend (using the intended die opening and method), and set the bed length to your longest regular bend plus handling margin. Confirm both against machine and tooling load limits.
It depends on material tensile strength, thickness, actual bend length, die opening, and bending method — not thickness alone. Calculate the force for your process, then confirm rated load limits. Use the tonnage calculator.
As a rough air-bending estimate for mild steel with a suitable die opening, about 50–60 tons per meter of bend. So a 1 m bend needs roughly 50–60 tons, and a 3 m bend roughly 150–180 tons. Stainless needs about 1.5× more; always confirm with the exact die opening and material.
Simple parallel-flange parts often need only 4 axes; tapered, offset, or variable-height parts justify 5 or 6. Choose axes from your part geometry, not a bigger-is-better assumption.
Sometimes. Verify tooling style, holder compatibility, tool height, load rating, and condition, and whether the old tools would limit the new machine's capability. Adapters may help.
15. Conclusion
Choosing a press brake is not about the biggest machine or the lowest price — it's about matching the machine, controls, tooling, and support to the parts you actually make. Work the sequence in order: define your parts and process, size the tonnage and geometry, choose the drive and control system, specify axes, accuracy, and tooling, evaluate real productivity, plan cost, and validate the supplier with an RFQ and a sample test.
The best press brake for your shop is the one that reliably produces the good parts you need at an acceptable total cost — and you can prove it before you sign.
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