Looking to enhance your knowledge of press brake dies?
Look no further! This article is your ultimate guide to understanding the various components of press brake dies and the materials used to manufacture them.
Whether you’re a seasoned professional or new to the field, this comprehensive guide will provide you with all the information you need to know about press brake dies.
From the commonly used V bend, U bend, and Z bend dies to the materials used to manufacture them, this article covers it all.
You’ll learn about the different types of press brake punches and dies, including straight punches, goose neck punches, and acute punches, as well as the classification of press brake dies.
Plus, you’ll discover the various materials used to manufacture press brake dies, including steel, alloy materials, and polymer materials.
So, if you’re looking to expand your knowledge of press brake dies, be sure to check out this informative article.
Before continuing with this article, kindly watch the video below, which showcases various bending techniques. You are sure to gain a wealth of knowledge from it.
What Is Press Brake Dies?
The press brake die is a tool utilized by the press brake machine to form sheet metal. This tool comprises of various components, and the composition of the tooling can vary.
The primary function of the press brake die is to alter the physical state of the material being formed, thus shaping the part.
Press brake dies can typically be divided into several parts, including the upper die, lower die, guide rail, and lower die base. These dies offer a great deal of versatility, with many of them able to be manufactured.
PS: regarding how to make press brake dies, we will cover this topic later.
Commonly Used Press Brake Dies
To extend the life of the mold, the press brake punch and dies are designed with rounded corners whenever feasible. The commonly used press brake dies include:
- V bend dies
- U bend dies
- Z bend dies
Typically, the height of the flanged edge should be at least three times the thickness of the plate (t), or L ≥ 3t. If the height of the flanged edge is too low, it becomes difficult to form even when using a bending die.
Classification of Press Brake Dies
Press Brake Punch
|Punch Type||Main Application|
|Straight Punch||Fabricated angles ≥90°|
|Goose Neck Punch||Fabricated angles ≥90°|
|Acute Punch||Fabricated angles ≥30°|
Press Brake Dies
|Punch Type||Main Application|
|Sing V Die||1. While V angle = 88°(ref), able to bend angles ≥ 90°|
|Double V Die||2. While V angle = 30°(ref), able to bend angles ≥ 30°|
Press brake segment die
Typically, the standard length of a press brake punch and die set is 835mm, and it can be divided into various sizes to accommodate the bending of workpieces of different lengths.
The sizes usually include 10mm, 15mm, 20mm, 40mm, 50mm, 100mm, 200mm, and 300mm, totaling up to 835mm.
Press Brake Dies Materials
What are press brake dies made of?
There are various materials that can be utilized to manufacture press brake tools, including steel, alloy materials, and polymer materials, among others.
Currently, steel is the most widely used material for producing press brake tools, including T8 steel, T10 steel, 42CrMo, and Cr12MoV.
42CrMo is a high-strength alloy steel that has undergone quenching and tempering to display high strength and toughness.
It can operate at low temperatures down to -500°C and is known for its high strength, toughness, and resistance to wear.
The common materials used for press brake dies can be divided into eight categories.
1. Carbon tool steel
T8A and T10A carbon tool steels are frequently used in the manufacture of press brake dies because of their good machinability and cost-effectiveness.
However, these materials have poor hardenability and red hardness and can undergo significant deformation during heat treatment. Additionally, they have a low capacity to bear loads.
2. Low alloy tool steel
By incorporating the appropriate amount of alloy elements into carbon tool steel, low alloy tool steel is produced, which reduces the deformation and cracking tendency during quenching and improves the hardenability and wear resistance of the steel.
Some of the commonly used low alloy steels in the production of press brake dies include CrWMn, 9Mn2V, 7CrSiMnMoV, and 6CrNiSiMnMoV.
3. High carbon and high chromium tool steel
High carbon and high chromium tool steel is known for its good hardenability, toughness, and resistance to wear.
It undergoes minimal deformation during heat treatment, making it a high-wear-resistant steel with a load-bearing capacity second only to high-speed steel.
However, due to significant carbide segregation, repeated upsetting and drawing (axial upsetting and radial drawing) are required to reduce the heterogeneous nature of the carbides and improve its performance.
Some of the common high carbon and high chromium tool steels include Cr12, Cr12MoV, and Cr12MoV1.
4. High carbon medium chromium tool steel
High carbon medium chromium tool steels utilized for press brake dies include Cr4W2MoV, Cr6W, Cr5MoV, among others.
These materials have low chromium content, fewer eutectic carbides, uniform carbide distribution, minimal deformation during heat treatment, good hardenability, and stable dimensions.
Compared to high carbon and high chromium steel which can exhibit significant carbide segregation, these materials offer improved properties.
5. High-speed steel
High-speed steel is frequently used in the production of press brake dies due to its high hardness, resistance to wear, and compressive strength. It also has a high load-bearing capacity.
W18Cr4V, W6Mo5, and Cr4V2 with reduced tungsten, as well as 6W6Mo5 and Cr4v high-speed steels developed to enhance toughness, are commonly used.
In order to improve its carbide distribution, high-speed steel also requires forging.
6. Basic steel
Basic steel is produced by adding a small amount of other elements to high-speed steel and adjusting the carbon content to enhance its properties.
This results in improved properties compared to high-speed steel, such as increased wear resistance and hardness, as well as better fatigue strength and toughness.
It is a press brake die steel with high strength and toughness, and it is more cost-effective than high-speed steel.
The commonly used basic steel materials in press brake dies include 6Cr4W3Mo2VNb, 7Cr7Mo2V2Si, 5Cr4Mo3SiMnVAL, among others.
7. Cemented carbide and steel bonded cemented carbide
The hardness and resistance to wear of cemented carbide in press brake die steel are the highest, but its strength and toughness when bending are poor.
Tungsten cobalt is used as the cemented carbide in press brake dies.
For press brake dies that require low impact and high resistance to wear, cemented carbide with low cobalt content can be selected. For high-impact dies, cemented carbide with high cobalt content can be used.
Steel-bonded cemented carbide is made through powder metallurgy, using iron powder and a small amount of alloy element powder (such as chromium, molybdenum, tungsten, or vanadium) as the binder and titanium carbide or tungsten carbide as the hard phase.
The matrix of steel-bonded cemented carbide is steel, which addresses the poor toughness and difficult processing of cemented carbide.
This material can be cut, welded, forged, and heat treated. Steel-bonded cemented carbide contains many carbides and has a hardness and resistance to wear that is lower than that of cemented carbide but still higher than other steel grades.
After quenching and tempering, its hardness can reach 68-73 HRC.
The material utilized for the press brake tool is a type of cold working die steel, and its primary performance requirements are strength, toughness, and resistance to wear.
Currently, the development trend in press brake die steel has two main directions, both centered around high alloy steel D2 (Cr12MoV).
(1) Improving the toughness of press brake die involves reducing the carbon content and alloy element content and enhancing the uniformity of carbide distribution in steel. Examples of this direction include 8CrMo2V2Si and Cr8Mo2SiV.
(2) Improving the resistance to wear of press brake die to accommodate high-speed, automated, and high-volume production with powder high-speed steel. An example of this direction is 320CrVMo13.
How to Choose Press Brake Dies
Different dies should be used to fabricate different workpieces. To select the appropriate press brake die, it’s important to have a thorough understanding of both the press brake machine and the die’s fabrication parameters.
The parameters of the press brake machine include the stroke, operating capacity, daylight (open height), and middle plate type.
The parameters of the die include the type of upper die shank (to match the middle plate) and the maximum bending force.
A. How to choose press brake parameters
Press brake die height formula:
Stroke (mm) = Daylight – Middle Plate Height – Upper Die Height – Lower Die Height – (Lower Die Height – 0.5V + t)
t = plate thickness（mm）
Given: daylight 370mm, max stroke 100mm
Reach: stroke = 370-120-70-75-(26-0.5*8+t) = (83-t)mm
Note: 0.5V < stroke < max stroke
It’s important to note that lower die bases come in different heights, which are utilized for various fabrication purposes. So, don’t overlook this when selecting a lower die base.
Different combinations of tools and dies can produce various combined heights for various fabrication purposes of parts.
B. How to choose press brake dies parameters
Upper die shank type
Upper die shank has three types to match different middle plate.
Upper die shape
Common standard upper die:
Upper die tip radius & top angle
Common upper die tip radius including:
（1）0.2R （2）0.6R （3）0.8R （4）1.5R （5）3.0R
When choosing the appropriate press brake die tip radius, a tip radius of 0.6R is recommended for plate thicknesses less than 3mm. The standard upper die tip angles include 90°, 88°, 86°, 60°, 45°, 30°, etc.
The dihedral angle of the die should be less than the fabrication angle. For instance, if the workpiece’s bending angle is 90°, a die with a tip angle of 88° should be selected.
Lower die type
Typically, there are two types of lower dies: single V type and double V type.
The single V type die has a broader range of applications compared to the double V type die, and the separated die is more commonly used than the full-length die. The choice of the lower die depends on the specific fabrication purpose.
Lower die V width (die opening), V groove angle
V groove choosing & plate thickness (T):
In order to choose a small V die for bending purposes in special cases, the spread of each punch should be increased by 0.2mm.
Min bending size
Normally min bending size:
— L-type: slot width/2 + plate thickness
— Z-type: slot width/2 + plate thickness * 2
The manufacturer of press brake dies is responsible for producing punches and dies for press brakes.
To purchase press brake dies, the easiest method is to request a quote from the press brake manufacturer.
Typically, the press brake manufacturer has a partnership with the press brake die manufacturer, meaning that the manufacturer of press brake dies will be a supplier for the press brake machine factory.
Press Brake Dies Price
The cost of press brake dies typically depends on various factors, such as market conditions, customer psychology, competition, and the status of the manufacturer.
The press brake die manufacturer will perform a comprehensive analysis of these factors to determine the cost of their punches and dies.
They may start with a base price that is increased by 10-30% to account for valuation, but this quote can be negotiated and reduced based on the specific situation. The final price is agreed upon by both parties and outlined in the contract.
It should be noted that the mold price may be higher or lower than the initial valuation, which only estimates the basic cost of production and does not consider additional costs or profits.
It’s important to note that the initial quotation for the press brake dies is not the final price and only serves as an estimate for development costs.
After the product has been successfully developed and generates profits, the added value of the mold fee will be extracted as compensation, forming the final mold price.
This price may be higher than the original estimate and have a high rate of return, ranging from dozens to hundreds of times the normal mold price. However, it’s also possible for the rate of return to be zero.
It’s important for the manufacturer to prioritize quality, accuracy, and service life of the press brake dies over cost. Pursuing low prices should not compromise the quality of the highly technical product.
It’s worth noting that mold valuations and prices can vary between enterprises, regions, and countries due to factors such as equipment technology, personnel concepts, and consumption levels.
In more developed areas or larger, technologically advanced enterprises, the focus may be on high quality and high prices, while in areas with lower consumption levels or smaller enterprises, the estimated mold prices may be lower.
It’s also worth mentioning that mold prices can change over time, and the immediate effect of mold price can be poor.
Different time requirements and manufacturing cycles result in different mold prices, with different prices for a pair of molds at different times and different prices for molds with different manufacturing cycles.
Press Brake Tooling Chart
Click below link to download the press brake toolings catalog:
Spring-back angle Δα=b-a
In the formula:
b—The actual angle of the workpiece after spring-back
Spring-back Angle for single 90 o free bending
Plate Thickness t (mm)
Medium carbon steel
High carbon steel
The factors that affect the resilience and the measures to reduce the spring back:
- Mechanical properties of the material
The angle of spring-back is proportional to the yield point of the material and inversely proportional to its elastic modulus (E).
To reduce spring-back for sheet metal that requires high precision, low carbon steel should be considered first, rather than high carbon steel or stainless steel.
The larger the relative bending radius (r/t), the smaller the degree of deformation and the larger the rebound angle (Δα). This is a critical concept.
When material properties permit, the small bend radius should be chosen to increase accuracy.
Care should be taken to minimize the design of large arcs, as they have a greater negative impact on production and quality control.
Press Brake Dies Installation and Commission
A press brake is a forging machine commonly utilized in the metal processing industry. The tooling for the press brake consists of several components.
It is imperative to carefully examine the equipment prior to installation and to strictly adhere to the instructions.
Additionally, prioritize safety during both the installation and commissioning process.
Well, what are the precautions during the installation and commissioning of press brake tooling?
Press brake adjustment
Before installation, it is important to carefully adjust the performance of the machine with patience and attention to detail.
It is also crucial to inspect the machine for any dust or iron debris and to perform thorough cleaning to prevent any future problems.
Ram stroke adjustment
Before installation, be sure to inspect the thickness of the die and verify that the proportion of the upper and lower die is correct.
Typically, the die should be aligned at the point of transition for the stroke line.
Stroke module adjustment
This is to correctly set the upper limit of the stroke.
Once the machine module reaches its highest level, activate the switch and secure the position of the ram.
It is also advisable to slow down the descent of the module to better protect the machine and its dies.
The main goal is to accurately measure the distance between the upper and lower modules.
The precise gap should be determined based on the material that will be folded.
The angle adjustment is closely tied to the product being manufactured. Typically, for 90° bending dies, the central angle should be greater than the angle between the two sides.
Tightness can be adjusted using the screw.
It is important to ensure proper pressure by adjusting it according to the pressure gauge to prevent damage to the die.
For those who may be curious about how to set press brake dies, the method largely depends on the press brake controller being used.
Typically, only CNC controllers, such as the Delem DA52s or DA66T controller, have the capability to set the dies for a press brake.
Determinants of Press Brake Dies Accuracy and Angle
The production standards for press brake tooling depend on maintaining accuracy and precision in angle. If these factors are not taken into account, it can lead to subpar production results.
(A) Factors that affect the accuracy
- wear of the bending machine mold;
- eccentric of press brake upper mold and lower mold
- the back stopper is not set in the specified position, or the surface been blocked by the burr;
- the workpiece itself;
- processing steps.
(B) Factors that affect the accuracy of the angle
- bending machine mold deformation, wear;
- mold shape;
- work surface flatness;
- the degree of parallelism from the horizontal support plane close to the upper mold to the work surface;
- the verticality of the slider stroke to the work surface;
- bending position;
- cutting method.
Top 10 Considerations When Using Press Brake Toolings
How to use press brake toolings?
Press brake tooling encompasses a variety of shapes including L-shape, R-shape, U-shape, and Z-shape bends. The upper die of the press brake is comprised of various punch angles including 90°, 88°, 45°, 30°, 20°, and 15°.
The lower die, on the other hand, includes options such as dual-V die and single-V die with varying slot widths ranging from 4V to 18V.
Additionally, there are specialized lower dies such as R-lower die, acute angle lower die, and hemming/flattening die.
Both punch and die are available in both separate and full-length options. The separated upper die options come in lengths of 300mm, 200mm, 100mm, 100mm, 50mm, 40mm, 20mm, 15mm, and 10mm, with a combined length of 835mm.
Similarly, the separated lower die options come in lengths of 400mm, 200mm, 100mm, 50mm, 40mm, 20mm, 15mm, and 10mm, with a total length of 835mm.
① The press brake bending molds are made from high-quality steel that has undergone special heat treatment, making them hard, durable, and capable of withstanding high pressure.
However, each mold has a limit on the amount of pressure it can bear, expressed in ton/meter. It is important to choose the appropriate length of the mold based on the maximum amount of pressure it can handle.
② To prevent damage to the die, it is crucial to align it with the original point using the 300mm upper and lower molds.
The upper and lower molds must have the same height and cannot be aligned using smaller split molds. The alignment must also be based on the regulated pressure within the press brake machine.
③ The molds can only be used in a press brake machine with the same height and cannot be used in machines with varying heights.
④ When operating the press brake tooling, it is important to choose the appropriate upper die and lower die based on the hardness, thickness, and length of the sheet metal.
The slot width of the lower die should be 5-6 times the thickness of the metal plate and should be longer than the sheet metal.
The harder and thicker the sheet metal, the wider the slot of the lower die should be.
⑤ When bending at an acute angle or a dead angle, a 30° punch should be used. The acute angle should be bent first, followed by flattening.
When bending an R angle, an R punch and R die should be selected.
⑥ When bending long pieces, it is best to avoid using segmented molds to prevent indentations at the connection points.
Instead, it is recommended to use a single-slot die, as the exterior angle “R” of a single-slot “V” lower die is larger and therefore less likely to cause bending indentations.
⑦ When selecting the top punch, it is important to consider the type of die and its parameters, and then determine the appropriate punch based on the desired product shape.
⑧ It is not recommended to use press brake dies for bending hard or excessively thick materials such as steel bars or cylindrical products.
⑨ Press brake mold operators must be attentive and focused while working.
After aligning the upper and lower dies of the press brake machine, it is important to securely lock them to prevent the punch from falling and causing injury or damage to the die.
Care should be taken to apply pressure gradually during the operation, without exceeding the recommended pressure limits, and monitoring the display screen for any changes in data.
⑩ Upon completion of the press brake tooling operation, the dies should be returned to the press brake die cabinet or storage area, labeled and organized properly.
Regular cleaning of the dies to remove dust is necessary, and applying anti-rust oil can help prevent rust and maintain the precision of the tooling.
U Bending with Press Brake Dies
U-bending should always use a gooseneck die, of which we currently have three sizes: small, medium, and large.
U bending size range
Note: A size do not include plate thickness
Press Brake Dies Cabinet
The cabinet will be convenient for you to store the press brake punches and dies.
20 Drawings of Press Brake Dies Application
Press Brake Dies Manufacturing Technique Analysis
High precision press brake tooling is a crucial component in the sheet metal processing system.
However, there are significant variations in the life and precision of bending dies among manufacturers, due to differences in equipment, materials, and technology used during the production process.
To provide guidance for sheet metal users when selecting bending molds, this analysis provides a brief explanation of relevant aspects of bending die production.
The sheet metal processing industry is a crucial component of the machinery manufacturing industry, and bending is a common and essential process in sheet metal fabrication.
To improve the quality and production efficiency of parts, it is important to choose a high-quality bending die.
So, what is the key to achieving good quality bending dies in the production process?
The Status of Press Brake Toolings
Currently, sheet metal users face several challenges when it comes to press brake tooling:
(1) There is a significant discrepancy compared to bending dies made in Europe, with an uneven distribution of mold brands, unstable mold quality, and poor precision.
(2) The cost of using imported bending dies is high and the lead time for delivery is lengthy.
(3) Communication channels with mold manufacturers for non-standard molds are limited, and response times are slow.
(4) The lack of a standardized mold industry means that manufacturers cannot interchangeably use each other’s molds, leaving sheet metal users with limited options for purchasing bending equipment only from press brake manufacturers.
Core Elements of Mold Quality
For press brake bending dies, the ideal material to use is 42CrMo from reputable steel companies.
This material possesses exceptional mechanical properties, including high strength and hardenability, excellent toughness, minimal deformation during quenching, and high creep strength and persistent strength at high temperatures.
While T7A and T8A materials are also available in the market, they have a soft tool core and are more prone to deformation due to the shallow depth of the quenching layer.
However, some manufacturers may choose cheaper materials due to cost constraints.
The heat treatment process is critical in obtaining qualified and uniform hardness for the bending die.
The desired hardness for the bending die should be 47±2HRC, meaning that the hardness at any position of the mold should be within the range of 45-49HRC and the depth of the hardness layer should be over 10mm.
The heat treatment process can be described as follows:
First, the hoisting ring is welded on the end face of the blank mold after rough milling, and then it is placed in a heating furnace until it reaches a temperature of 880℃.
The mold is then discharged, quenched in oil, cooled, checked for deformation, corrected through cold correction, tempered, and tested for hardness.
The tempering time will vary depending on the batch of molds. After these steps, the rough milling blank mold will have undergone its heat treatment process.
The above steps have several key points to consider:
- Suspend heating and suspend quenching oil cooling on end welding rings.
Due to the irregular geometry of the bending die, cooling occurs at varying speeds, leading to significant deformation and lack of control.
To effectively minimize mold deformation, only suspended combustion and suspended cooling methods should be used.
In the heating and cooling process, the hoisting ring is first welded to the bending die before it is placed in the heating furnace.
However, if the mold is too heavy, the hoisting ring and mold may fracture at a temperature of 880°C.
To ensure that the mold can withstand heat treatment, the bending die factory requires that press brake bending dies be produced with a standard length of 835mm.
If defects occur during the heat treatment process, the lifespan of the mold will be greatly reduced.
- Cold correction.
After the mold is removed from the oil furnace, its irregular shape can cause uncontrollable amounts of deformation.
To address this issue, each mold must be checked for deformation, and if the deformation is too significant, it must undergo cold correction.
Some manufacturers use outdated methods, such as flame gun burning, to correct deformation, which can lead to local softening and pose safety hazards during use.
To ensure a long service life for the bending die, strict control over the heat treatment process is necessary.
If a stainless steel plate with a thickness of 2.0mm (including 2.0mm) or a cold plate under 3.0mm (including 3.0mm) is bent using a lower die with a V opening of 6-8 times the thickness, the R angle of the bending edge can withstand 2 million bends (calculated based on 200,000 bends per year for 10 years) with an abrasion of the cutting edge of less than 0.03mm.
While lower prices may seem more cost-effective, it is important to consider the number of uses.
Only professional heat treatment techniques and high-quality materials can ensure the durability of the bending die. In the long run, the lower cost may not be worth it.
Precision CNC forming grinding
The material of the mold and heat treatment discussed in the first two points primarily focus on the longevity of the bending die.
However, the processing method of the cutting edge and V groove are key processes in ensuring the precision of the die.
There are two methods available: traditional grinding and CNC Precision Grinding.
Traditional grinding relies heavily on human intervention throughout the process, while CNC grinding is fully controlled by equipment and the CNC controller.
This difference in consistency and stability is a major factor contributing to the lack of an industry standard for bending dies.
Each manufacturer produces molds to their own specifications, making it difficult for sheet metal users to choose the best die for their needs.
If there were a uniform size standard, users would have more freedom in choosing a manufacturer.
The most common lengths of press brake bending dies are 835mm, 500mm, and 515mm.
While accuracy should always be a priority, a lightweight mold can improve production efficiency and reduce the workload of production personnel.
Fig.1 Commonly used top punch.
Fig.2 Different V slot ratios for the lower die
Press Brake Dies Application
Precautions For The Use Of Special Press Brake Dies (Especially for Acute Punch)
a. Acute Punch
When using an acute punch, it is important to pay attention to the opening angle of both the upper and lower dies.
The angle of the upper die must be less than or equal to the opening angle of the lower die, or it can result in damage to the lower die and pose a potential hazard.
b. Flattening Die
The operation specification for using the flattening die to bend the workpiece in the non-flattening state is as follows: The standard flattening die has a length of 835mm x 3 = 2505mm, as shown in Figure 1.
1) When the bending length of the workpiece L<835mm:
Place the workpiece between the two lower dies, as shown in Figure 2:
The correct approach:
Place the workpiece in the middle of any segmented lower die, as shown in Figure 3:
2) When the bending length of the workpiece 835≤L＜1670mm:
Place the workpiece in the middle or on the far side of the entire die, as shown in Figures 4 and 5.
The correct approach:
Place the workpiece in the middle of any two lower die, as shown in Figure 6:
3) When the bending length of the workpiece 1670≤L≤2505mm
Place the workpiece on the far side of the entire mold, as shown in Figure 7:
The correct approach:
Place the workpiece in the middle of the middle of the mold, as shown in Figure 8:
To extend the lifespan of the mold, it is important to follow proper operating instructions as outlined above.
Improper use of the flattening die can result in failure of the return spring, breakage of the guide set screw, and even damage to the flattening die itself.
Application Of Press Brake Forming Die
The bending die, as the central component of the press brake machine, has a direct impact on the appearance, accuracy, production cost, efficiency, quality stability, and operator safety of the bending process.
For parts with stable order quantities and large batches in the sample stage, process capability analysis should be conducted in advance.
Complex structures require various die structures and forms, leading to long processing times and disrupting the production rhythm.
To clear obstacles for mass production, early screening of structures and a reasonable matching of molds is necessary.
Small-sized parts that are challenging to control and locate, with processing hazards and low efficiency in large single batches, can be improved by customizing special forming dies in the press brake for process optimization.
Customizing the special forming die in the press brake for process optimization offers several benefits compared to the previous hard die processing by press machines.
The special forming die on the bending machine is more flexible in terms of die switching, debugging, and processing, and has a higher return on investment for the die.
This leads to improved production efficiency, more stable product quality, and effectively avoids the safety risks associated with small-sized parts in the bending process.
The following case studies demonstrate the workshop’s recent improvements in process capability through the customization of special forming dies in press brake machines for efficient production.
Practical using of forming die
At the start of the project, normal single-step bending was used, and the final product required three folds, as shown in Figure 1.
Fig. 1 Single step bending before improvement
Due to the small size of the workpiece and the presence of two bending edges, the contact area between the reference plane and the rear positioning is limited, making it challenging to securely position the workpiece.
This leads to low bending efficiency, difficulties in maintaining bending accuracy, and potential safety risks during the processing process. As a result, only 1000 pieces are produced in one run.
To meet the production schedule, it is often necessary to operate multiple press brakes at the same time.
To enhance the process, a customized forming die was created based on the number of repeat orders.
As a result of the improvement, the process now allows for the simultaneous processing of 6 bending edges and 2 products, as shown in Figure 2.
Fig. 2 One step processing of customized special forming die after improvement
The use of the forming die ensures the accuracy of the parts and significantly improves bending efficiency. It eliminates the risks associated with the single-step bending process of the original small parts.
As a result, there is no longer a need to use the original high-precision upward-moving press brake.
Instead, the older downward-moving press brake can be utilized, which helps to distribute the press brakes in the production line and frees up production capacity.
As depicted in Fig. 3, the workpiece requires four bends and flipping with strict tolerance requirements.
However, the center distance and flatness of the finished product are not up to standard, leading to a high rate of initial waste for the sample.
There is significant potential for improvement in both production efficiency and product quality.
Fig. 3 Bending before improvement
Due to the high standards for the appearance of the product, using micro-connections after continuous folding is not a viable option.
To meet these requirements, a custom-made forming die was created for single-step forming processing.
As a result, the process can now complete four finished products with a total of 16 bends in one cycle, as shown in Figure 4.
Fig. 4 One-step forming process with customized special forming tool after improvement
The use of the custom-made forming die has resulted in a six-fold increase in efficiency compared to the previous method.
This approach ensures that the workpiece meets the tolerance requirements outlined in the drawing, while also maintaining accuracy and flatness, thus ensuring stability in product quality.
The bending surface of the workpiece depicted in Fig. 5 is only 8 mm wide and has a symmetrical design. However, the two beveled bending edges at the root make it susceptible to stretching and deflection.
Fig. 5 Customized special forming die for processing
Initially, the small size of the workpiece made it challenging to handle, requiring operators to remove their gloves for positioning.
This resulted in low production efficiency and posed a serious safety risk during the production process.
To address these issues, the project team created a custom-made forming die to improve the process.
The improvement involved the use of right-angle edges for positioning, allowing for the simultaneous production of 2 pieces (8 bends).
This resulted in improved precision and stability of the parts, as well as a significant increase in production efficiency, effectively eliminating any potential safety hazards in the processing process.
Box products are highly customizable and come in various sizes. During the bending process, operators need to bend the front and back four times.
To minimize deformation after welding, large structures are often designed as integrated structures, which leads to high labor intensity for employees.
Despite the high degree of customization, the bending structure and size are consistent. To address these challenges, a custom-made forming die was created for processing.
The original 12-step bending process for the box was simplified to 4 steps, with three bends formed in one step.
The use of the forming die eliminates the need to rotate the entire process, as demonstrated in Figure 6, greatly improving bending efficiency.
Fig. 6 The whole process does not need to be overturned after improvement
By using a rotary platform for processing, the labor intensity of operators is effectively reduced and the accuracy of welding is ensured.
Rational application of high efficiency die set
The implementation of the forming die has certain limitations that must be taken into account in conjunction with the product’s bending structure and sustainable order support.
To optimize production, the concept of rapid die change is applied to common structural workpieces.
This allows for quick die clamping, reducing die replacement and debugging time, maximizing operational time, and minimizing machine downtime, waste from semi-finished product turnover, and other non-value-added activities.
When ordering the mold during the sample stage, engineers should consider this concept to avoid potential challenges such as repeated loading and unloading, mold adjustment, handling, semi-finished product storage, and tolerance issues that can result from accumulated factors during actual production.
To achieve efficient production, the use of concentric equal height molds for simultaneous clamping of multiple structure molds can be considered, as shown in Figure 7.
Fig. 7 Concentric contour die
Given the stable order volume and complex structure of the workpieces, the custom-made special contour die simplifies the original four-step die change process into a single step to complete the final product.
Furthermore, four types of dies, including acute angle, flattening, segment differentiation, and straight punches, are available to produce the final product in one step, as shown in Figure 8.
Fig. 8 Special contour die
Improving bending efficiency is a long-term, comprehensive, and ongoing effort.
By adopting low-cost solutions such as bending forming dies, it is possible to double output while halving input, maximizing the potential of existing equipment.
The integration of high-efficiency die sets and supporting software can significantly enhance the output and efficiency of the bending process.
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26 thoughts on “The Ultimate Press Brake Dies Guide for Precision Bending”
How can I calculate the bending force (tonnage for my press brakes) when bending with large radius punch R85, and die tool radius R100, sheet metal plate thickness 15 mm, width 500 mm?
Can I use these formulas that I can find on your site or is it some other equation.
Can you write some artical about bending big radius and construction of tools, punch and dies?
Thanks a lot.
You can use our press brake bending force calculator for the different bending radius, here is the link:
Someday in the near future, we will write something about this, so stay tuned.
And many thanks for your comments.
I am bending 10ga. stair pans and wanting to bend past a 90 ° to about a 105°. What kind of top and bottom dies would I need to purchase for this?
The goose neck punch can meet your requirement. Here is the drawings of the press brake punch and dies: https://www.artizono.com/press-brake-tooling/
Is it possible to make a punch and die that can do 3 bends at once? Down up down
Definitely no problem, this belongs to non-standard press brake toolings. If you need one, you can contact us.
Please send me a quotation of one 4 way V die 12 feet long.
we accept used tooling
Hello Dear Frd,
i am developing new part at supplier end.
Part has thickness 20 mm and angle 150 ,radius 30 .its is possible to bend in V-opening 220 ?
please help me ,its urgent .
The inner radius will be 0.5×220=110mm, 30 is not possible.
it is help full can i get it in pdf format please
Sorry sir, we don’t provide PDF format. However, you can read it here anytime, anyplace.
i want know that, if i bend sheet of 1 mm to 3 mm in 90 degree then what is the punch redius? what is the lower dies redius and angle? what is pressing troke?
All of them are decided by which bottom die that you choose as well as the bending method (air bending, bottoming, coining)
I am after some advice. I am trying to achieve folds with sharp fold edges with very minimal internal and external radii but am unable to find any tooling which can achieve this. Is this only possible with groove lines in the material prior to folding? Or is there some tooling available?
Yes, you will get a very small radius of the sheet after bending only possible with groove lines first. It’s not the problem of toolings.
What are the factors to consider for buying 30 degree V-die, vs 84 Degree V-die, both for air bending (mostly 90 bends). What are the differences and which one is better?
84 degree V-die is better causing this die can provide support during bending.
i HAVE PRESS BRAKE .3 MTER CAPACITY WITH TAPER WEDGE ADJUSTMENT ,BUT 2000 PLANE SHEET 1.2 MM THICKNESS NOT BENDING CORRECTLY.
You need to adjust your crowning device.