Press Brake for Sale
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The complete guide to the press brake machine is just updated in 2019. And we will continue to get this post updated for more new content.
What Is A Press Brake
First please spend several minutes to learn what is a press brake.
In the following content, we will much focus on the hydraulic press brake, not the manual type or the mechanical type.
See also:
Why the Machine for Sheet Metal Bending is Been Called Press Brake?
Working Principle of the Hydraulic Press Brake
Fix the top punch and bottom die on the upper and lower worktable, utilize the relative motion of the worktable driven by hydraulic transmission as well as the shape of the punch and die, to achieve the bending formation for sheet metal materials.
Hydraulic Press Brake Working Principle Diagram
Hydraulic Press Brake Composition
Generally, the press brake machine including four main parts:
- Mechanical parts
- Electrical parts
- Hydraulic part
- NC/CNC controller
See also:
Press Brake Application
Press brakes are widely used in energy, transportation, automobile, machinery, metallurgy, shipbuilding, aviation, military, agricultural machinery, petroleum machinery, power generation industries.
Press Brake Toolings
Press brake standard toolings including the punch and die, for the stamping and separation of sheet metal. The die for forming has a cavity, while for separation it has a blade edge.
See also:
Press Brake Gauge
The commonly used press brake gauge including angle gauge, angle ruler and venier.
TOP Press Brake Manufacturer List
The following two lists will definitely help you sort out the ideal press brake manufacturers for you.
Press Brake Training
The best training provides you with the manuals, you can learn wherever you are, and anytime you want. Here I collect some of the most popular manuals for your reference:
- Press Brake Estun E21 Operation Manual
- Press Brake Estun E200P Operation Manual
- Press Brake Estun E300 Operation Manual
- Press Brake Delem DA41 Operation Manual
- Press Brake Delem DA52s Operation Manual
- Press Brake Delem DA-66T Operation Manual
You can also check out the definitive guide to press brake bending basics to learn more information about sheet metal bending.
Press Brake Safety
I believe here I don’t need to explain how it is important to take note of the safety operation of press brake. You can check out the press brake safety tips to know more.
If you press brake operators, you should read below press brake common failure analysis carefully, probably it will help you solve big problems.
Press Brake Maintenance Checklist
Before the press brake maintenance or cleaning of the machine, align the top punch with the bottom die before drop it, then shut down the press brake until the completion of the work. If required to start the machine or other operations, select the jog mode, and ensure safety.
The maintenance content is as follows:
Hydraulic oil circuit
- Weekly inspection of the oil levels in oil tanks, it should also be checked for hydraulic system maintenance. If oil level below the oil window, the oil tank should be filled with hydraulic oil;
- The hydraulic oil used in press brake is ISO HM46 or Mobil DTE25;
- The new press brake should change the oil after 2000 hours running, after that change oil for every 4,000-6,000 hours operation. Clean the fuel tank for every oil changing;
- System oil temperature should be between 35℃~60℃, no more than 70 ℃, the too high temperature will lead to deterioration of oily and accessory damage.
Filter
- Each time during the oil change, the filter should be replaced or thoroughly cleaned;
- If the press brake has the related alarm or the oil is not clean, or some other unusual things for the filter, the filter should be replaced;
- Clean the air filter on the tank every 3 months, preferably change it every year.
Hydraulic Parts
- Monthly cleaning of hydraulic components (substrates, valves, motors, pumps, tubing, etc.), to prevent dirt from entering the system, cannot use detergent;
- One month after the use of the new press brake machine, check whether the bending point of the tubing has deformation, if yes then it should be replaced. After the use of two months, should be fastened to all parts of the connection, the press brake should be shut down to ensure that there was no pressure of the system when doing this work.
Press Brake Inspection Checklist
Brief Description
- Standard test order does not mean the actual test order, it is changeable
- Adjusting the mechanism and parts which may affect the precision is prohibited during the test process.
- Workpiece precision inspection conditions:
- Requirements on workpiece
- If the workpiece is made by an A3 steel plate, it’s tensile strength Qb≤ 450MPa
- The number of workpieces shall not less than 3 pieces
- The opening size of lower die shall be 8-10 times as large as workpiece thickness
- Workpiece should be put on the worktable middle position
- Bending angle is 90°
- Measure from end 100mm
The inspection method and accuracy range shall be based on GBT-14349-2011-Metal Press Brake- Precision
Note: the worktable is floated, inspection G2, G3 shall refer worktable vertical plate as a benchmark.
Press Brake Bending Radius
There should have a bending radius for sheet metal bending, it should not be too large or too small, and should be chosen appropriately. If the bending radius is too small, it will cause cracking at the bend position; if the bending radius is too large, it is easy to rebound.
The optimum bending radius of different thickness of various materials (bend inner RADIUS) see table below:
| Metal | Annealing Condition | Cold Hardening State | ||
| The corresponding position of bending direction and fiber direction | ||||
| Vertical | Parallel | Vertical | Parallel | |
| 08, 10 | 0.1t | 0.4t | 0.4t | 0.8t |
| 15, 20 | 0.1t | 0.5t | 0.5t | 1.0t |
| 25, 30 | 0.2t | 0.6t | 0.6t | 1.2t |
| 45, 50 | 0.5t | 1.0t | 1.0t | 1.7t |
| 65Mn | 1.0t | 2.0t | 2.0t | 3.0t |
| Aluminum | 0.1t | 0.35t | 0.5t | 1.0t |
| Brass | 0.1t | 0.35t | 1.0t | 2.0t |
| Soft Brass | 0.1t | 0.35t | 0.35t | 0.8t |
| Semi-rigid Brass | 0.1t | 0.35t | 0.5t | 1.2t |
| Phosphor bronze | / | / | 1.0t | 3.0t |
The data in the table above is the preferred data for reference only. In fact, the rounded corners of press brake are usually 0.3, and a small number of the rounded corners of the press brake punch is 0.5.
For ordinary low carbon steel plate, anti-rust aluminum plate, yellow copper, purple copper etc., the inner radius 0.2 is no problem, but for some high carbon steel, hard aluminum, super-hard aluminum, the use of 0.2 radius will lead to bending fracture or the outer radius crack.
Press Brake Tonnage Calculation
Click above link you will get the answers.
DIY Press Brake
Sometimes, the workshop owners need to bend steel, just for several pieces of steel, so buy a completely new press brake is not the best way. That’s why they want to build a press brake on their own, just to diy some simple press brake for bending purpose.
Therefore, the homemade metal brake press is what they want.
Here I collect some videos for the home build press brake, hope you can make one with the tutorials been provided.
Press Brake Wiring Diagram
Different manufacturers will design different press brake wiring diagram. When you purchase it, the suppliers will send you the wiring diagram together with the hydraulic diagram as well as the installation and operation manuals. If you did not see it when you receive the machine, please contact your supplier immediately.
The following press brake wiring diagram is from us, just for your reference.
Press Brake Controller
There are two popular press brake controllers, one is from China’s Estun, which is the sole agent of DELEM control in China, the other one is DELEM from Holland.
See also:
The key factor for press brake including two parts, one is the machine itself, such as the quality, accuracy, etc, the other one is the control system.
The installation manual and operation manual of press brake controllers in PDF form can be downloaded from below link.
Operation Manual:
- Press Brake Estun E21 Operation Manual
- Press Brake Estun E200P Operation Manual
- Press Brake Estun E300 Operation Manual
- Press Brake Delem DA41 Operation Manual
- Press Brake Delem DA52s Operation Manual
- Press Brake Delem DA-66T Operation Manual
Installation Manual:
- Press Brake Estun E21 Installation Manual
- Press Brake Estun E200P Installation Manual
- Press Brake Estun E300 Installation Manual
Press Brake Programming and Setup
The above operation manual and installation manual of press brake controllers have explained the programming and setup very clear, please download it from above and read it carefully.
Press Brake User Manual
How to use the press brake
According to fabricate Q235 mild steel with hydraulic press brake to do a simple introduction:
- First, connect the power, turn on the key switch on the control panel, and then press the pump to start, then you can hear the oil pump rotating sound. (The machine does not run at the current time)
- Stroke adjustment. You must pay attention to stroke adjustment for press brake operation, it must be tested before bending. Must ensure that there is clearance which equals the thickness of the plate when the top punch down to the bottom of the lower die. Otherwise, the mold and press brake will be damaged. The adjustment of the stroke also has the electric quick adjustment and the manual fine adjusts.
- Regarding V-width choosing, generally, the width of the V opening should be 8 times the thickness of the plate. For example, for bending 4mm plate, you should choose 32mm V-opening die.
- Back gauge adjustment generally has electric fast adjustment and manual fine-adjustment.
- Step down the pedal switch to start bending, you can loosen at any time. If loosen the foot, the bending machine will stop, step again to continue bending.
Here we provide press brake operation manuals to guide you operating press brake. Download the press brake operating instructions here.
See also:
Press Brake Forming Process Technology
Press Brake Tips
If you read the articles on our bending category, you will see various different types of articles writing about press brake and sheet metal bending. So take your time to read it carefully for learning. You will benefit a lot from it.
A quick calculation method of sheet metal bend expansion
For sheet metal bending and expansion, one side of the sheet will be elongated, the other side will be compressed. The affecting factors including material type, material thickness, heat treatment and bending angle.
Expand Calculation Principle:
- During the bending process, the outer layer is subjected to tensile stress, and the inner layers are subjected to compressive stress. There is a transition layer which is neither tensile nor pressure from pull to pressure, which is called the neutral layer. The length of the neutral layer remains unchanged in the bending process, the same as the length before the bending, so the neutral layer is the basis for calculating the expansion length of the bending piece.
- The position of the neutral layer is related to the degree of deformation.
When the bending radius is larger and the bending angle is small, the deformation degree is small, and the neutral layer is near the center of the sheet thickness; When the bending radius becomes smaller and the bending angle increases, the degree of deformation increases, and the position of the neutral layer moves toward the inner part of the bending center gradually. The distance from the neutral layer to the inside of the sheet is expressed in λ.
Basic Formula for Expansion Calculation:
Expansion length = inner layer + inner layer + compensation amount
Calculation of minimum bending edge of one bend
The starting state of the L-bend is shown in the following illustration:
Reference table for bending inner R and minimum bending height of the cold rolled sheet
| No. | Thickness | Die Groove Width | Convex die R | Min Bending Height |
| 1 | 0.5 | 4 | 0.2 | 3 |
| 2 | 0.6 | 4 | 0.2 | 3.2 |
| 3 | 0.8 | 5 | 0.8/0.2 | 3.7 |
| 4 | 1.0 | 6 | 1/0.2 | 4.4 |
| 5 | 1.2 | 8/6 | 1/0.2 | 5.5/4.5 |
| 6 | 1.5 | 10/8 | 1/0.2 | 6.8/5.8 |
| 7 | 2.0 | 12 | 1.5/0.5 | 8.3 |
| 8 | 2.5 | 16/14 | 1.5/0.5 | 10.7/9.7 |
| 9 | 3.0 | 18 | 2/0.5 | 12.1 |
| 10 | 3.5 | 20 | 2 | 13.5 |
| 11 | 4.0 | 25 | 3 | 16.5 |
The starting state of the Z-bend is shown in the following illustration:
The minimum bending size (L) of the sheet metal corresponding to Z-bend for materials with different thickness is shown in the following table:
| No. | Thickness | Die Groove Width | Convex die R | Z Bending Height |
| 1 | 0.5 | 4 | 0.2 | 8.5 |
| 2 | 0.6 | 4 | 0.2 | 8.8 |
| 3 | 0.8 | 5 | 0.8/0.2 | 9.5 |
| 4 | 1.0 | 6 | 1/0.2 | 10.4 |
| 5 | 1.2 | 8/6 | 1/0.2 | 11.7/10.7 |
| 6 | 1.5 | 10/8 | 1/0.2 | 13.3/12.3 |
| 7 | 2.0 | 12 | 1.5/0.5 | 14.3 |
| 8 | 2.5 | 16/14 | 1.5/0.5 | 18.2/17.2 |
| 9 | 3.0 | 18 | 2/0.5 | 20.1 |
| 10 | 3.5 | 20 | 2 | 22 |
| 11 | 4.0 | 25 | 3 | 25.5 |
See also:
Press Brake Bending Allowance (Tolerances)
1) Tolerance Standards for Common Bending
2) Tolerance Standards for Z Bending
3) Tolerance Standards for V Bending
4) Tolerance Standards for U Bending
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I really like reading an article that can make people think.
Also, thanks for allowing for me to comment!
Thank you for your compliment, very appreciate that.
This is incredible, thanks so much for sharing.
Answer, please, a question.
At bending of the broad band from thick metal on the small radius, where the cracks will begin on outside surface of this band:
on two lateral surfaces of this band
or in the center for width of this band?
Thanks.
Check out below post, it might solve your questions:
https://www.machinemfg.com/sheet-metal-forming-processes-equipment/
Thanks for prompt reply. According to your link, in the figure 17,c (this figure is provided on many websites), the beginning of formation of a crack is not visible (from the center or from two opposite edges?).
You can give still links to photos, on which the beginning of formation of a crack is visible at bending? Thanks.
This has to be, hands down, the best article explaining 1) what press brakes are, 2) what they do, 3) how they function, 4) how the used material is affected and 5) what are some alternatives for simpler forming needs (i.e. folding). Great job guys!! Love it!
Great blogs , thanks for sharing
Thanks for the information
Great posting friend. Will be back to read more.
needing setup and operators manual for dnc-88s cyblec anyone have one?
Sorry sir, currently we don’t have.
what should be the minimum lip size for c -Purlin of thickness 3mm and suggest me the V-length to use.
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there is machine specially designed to make C-purlin. For the lip size, you should refer to the bending force chart. Here is the link: https://www.machinemfg.com/press-brake-bending-force-calculator/
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