Press brake is a machine used for sheet metal bending.
Press brake is mainly used in the stamping of metal products, construction industry, automobile industry, aerospace, and other fields.
With the continuous growth of global demand for metal products, press brake manufacturing is also booming.
Many manufacturers or purchasing agents in related industries hope to purchase the most suitable press brakes.
The qualifications of press brake manufacturers are various in terms of product quality, price, and services.
This requires you to compare different brands and choose the most cost-effective press brake according to their own needs.
This article introduces the top 10 press brake manufacturers in the world in 2022.
Address: 200, Ishida, Isehara-shi, Kanagawa 259-1196, Japan 0463-96-1111
Products: plate punching, bending, shearing machine, laser cutting machine, and other sheet metal processing machine, as well as corresponding toolings, spare parts, and cutting products.
About the company:
Amada is a global manufacturer of metal processing machinery with a long history.
It was founded in Japan in 1946. It mainly provides sheet metal machinery, cutting machine, grinding machine, stamping press, and precision welding machine.
In addition to these main products, Amada also provides software, tooling, and other supporting products and services.
Amada constantly develops new technologies and provides customers with solutions according to customer needs and market changes.
Amada's products have a comprehensive and reasonable mechanical structure. It can provide users with the best quality guarantee.
Amada’s products have the characteristics of efficient and environment-friendly operation.
Its advanced technology of simulated automation can provide users with the most perfect and simplified processing guarantee.
Amada's press brake has the characteristics of high precision, fast, low energy consumption, and environmentally friendly.
It can be said that Amada's product quality has always been impeccable.
Moreover, Amada also provides a full set of technical support such as pre-sales training and after-sales service.
But its price is more expensive and the operation is complex.
This requires professional training to better operate the machine.
Address: Johann-Maus-Str. 271254 Ditzingen Germany
Machines & Systems, Lasers, VCSEL solutions photodiodes, Power electronics, Power tools Software Services
About the company:
The TRUMPF Group was founded in Germany in 1923.
TRUMPF Inc. is the North American subsidiary of TRUMPF GmbH + Co.KG.
The group has two departments: machine tool/power tool and laser technology/power supply.
It is one of the best manufacturers of sheet metal fabrication machinery, industrial lasers, and industrial application electronic products in the world.
TRUMPF is guiding the technological development trend with continuous innovation.
TRUMPF is establishing new technical standards and is committed to developing and updating more products for the majority of users.
TRUMPF's press brake is Trubend series.
TRUMPF's press brake has advanced bending technology and a beautiful appearance.
It has high bending accuracy and high speed, but the price is too high.
Address: 17400 56th Ave Surrey, British Columbia V3S 1C3, Canada
Press Brakes, Shears, Turret Punch Press, Tooling, Automation
About the company:
Accupress is a professional manufacturer of CNC machine tools, established in Canada in 1973.
It mainly manufactures press brakes, shearing machines, toolings, and other peripheral products.
Accupress specializes in a large-tonnage, tandem press brake, and robot automation. Accupress is known for its high manufacturing quality and advanced technology.
The newly developed visual control program can automatically adjust the bending process.
Accupress press brake uses the servo-electric hybrid hydraulic driving system, which is energy-saving and environmental protection.
It also has an efficient control system, which can improve bending accuracy and productivity.
Address: 2200 West Central Road Hoffman Estates, IL 60192
Laser Cutting Systems, Tube Processing, Press Brakes, Automation Laser, Automation Bending, Software
About the company:
Bystronic is a world-famous provider of sheet metal processing solutions, established in Switzerland in 1964.
The company focuses on the automation of the complete material and data flow of the cutting and bending process chain.
Bystronic mainly provides laser cutting machines, press brakes, automation systems, and related software.
Bystronic is excel at small and medium-sized press brakes, which are highly precise, flexible, and fast.
Address: Durmazlar Machinery Headquarter OSB 75.Yil Bulvani No：416140 Nilufer/Bursa
Laser cutting machines, Press brakes, Guillotine shears, Punch press, Plasma cutting machines, Cylinder bending machines, Combined shears, Corner notching machines, Loading unloading system
About the company:
Durmazlar Machinery was established by Ali Durmaz in 1956.
Druma is a world-renowned manufacturer of metal processing machinery.
Druma's products include CNC press brakes, turret presses, punching machines, all-solid-state fiber lasers, shears, ironworkers, plate rolls, angle rolls, and saws.
Durma's products have high precision, reliable quality, and low maintenance and operation costs.
Address: Via Guido Salvagnini 51 Sarego (VI) 36040 Italy
Punching machines, Panel benders, Press brakes, Fiber laser cutting machines, FMS lines, Automatic store-towers, Software
About the company:
In 1963, Milan. Guido Salvagnini established the company in Italy.
Salvagnini Group is a world leader in the field of flexible automation and sheet metal processing machinery.
Salvagnini provides users with the latest flexible high-performance machines and systems.
Products and services include panel benders, integrated punch shearing system, mechatronic punching machine convertible in laser-combi, FMS production line, fiber laser cutting machine, the ROBOformER robotic bending cells, etc.
Salvagnini has developed a fully automatic robot bending unit operated by a single controller and a single program.
The CNC press brake of Salvagnini is suitable for factories with sufficient budget and inclined to the automatic production line.
Address: Nijverheidslaan 2 • 8560 GULLEGEM • Belgium
Laser cutting machines, Punch presses, Press brakes, Shearing machines
About the company:
Founded in Belgium in the 1950s, LVD is a leading enterprise in laser, punching, and bending technology.
It is a world-famous manufacturer of metal forming equipment.
LVD has the most comprehensive press brake production line.
Customized multi-axis CNC plate bending machine with Easy-Form® laser angle measurement technology.
The performance of the press brake is stable and efficient.
LVD CNC press brake uses a wide range of toolings, equipped with automatic tooling change and tooling library equipment.
Country: United States
Address: 7420 Kilby Road Harrison, OH 45030
Lasers, Press brakes, Shears, Automation, Powered metal presses, Software
About the company:
Cincinnati incorporated was founded in the United States in the late 1990s.
It is a manufacturer of metal manufacturing equipment with a long history. The product's scope is wide, including press brake, shearing machine, laser cutting machine, etc.
Cincinnati's machine is very durable with low maintenance cost. The main bending machine series include HYFORM、MAXFORM、AUTOFORM、PROFORM、BASEFORM.
Address: Nuppiväylä 7, 60100 Seinäjoki - Finland
2D and 3D laser machines, Punching and combined punch, Laser and punch, Shear machines, Press brakes, Panel benders, Flexible Manufacturing Systems, Automation
About the company:
Founded in Finland in 1969, Prima Industrie is a leader in laser and sheet metal fabrication machines. Prima Power is expertise in mechatronics, optoelectronics, automation, and software.
Prima power provides customers with professional servo-electric solutions for punching, bending, and integrated processes.
Prima power has a wide range of products, with advanced and mature press brake technology, high efficiency, and environmental protection.
Address: Yrittäjänkulma 5, 33710 Tampere, Suomi
Press brakes, Press brake tools, Service and spare parts, Messer Cutting Systems
About the company:
Founded in Finland in 1978, Aliko is one of the leaders in press brakes and tools in the mechanical engineering industry.
Aliko's strengths have always been innovative product development, design, and flexibility.
The company has been focusing on the development, design, production, and service of large press brakes.
Aliko specializes in producing press brakes with a bending length of 3000 mm and a tonnage of 220 tons or more.
Aliko provides high-quality press brakes and tools for more demanding customers.
The press brake manufacturers introduced in this article are well-known enterprises in the world. Both product quality, performance, and service are guaranteed. If your budget is sufficient, you can choose the right one from these manufacturers.
Of course, there are many other press brake manufacturers with high-cost performance, which is worthy of further exploration by users.
With over 40 years experience in press brake manufacturing, I believe we can be one of your best choices for purchasing a good press brake that right fit your needs. You can contact us right now to get our expert suggest based on your practical use.
The toolings of the press brake are divided into two parts.
The toolings installed on the top of the ram are called punches, and the bottom toolings on the workbench are called dies.
The two parts work together on the metal plate to complete the bending of the workpiece.
The process that which the punch of the press brake exerts a force on the metal plate on the die is the bending process.
The upper die presses the metal plate through different power sources driving the ram.
The driving sources include mechanical, hydraulic, and servo motors.
There are different types of punches and dies.
The accuracy and efficiency of bending can be improved only by selecting the correct matching punches and dies for bending.
The standard size toolings are more convenient to replace. Because the design of tooling parts with standard dimensions is consistent.
In this way, there is no need to make too many adjustments when replacing the punches and dies. These toolings are kept in the same position to replace conveniently.
The upper parts of the ram of the press brake need a clamping device for fixing the punches.
The clamping can fix the punches in the required position. The punches bend the metal plate with the motion of the ram.
Die segmentation can facilitate the bending process of various sized workpieces. Press brake toolings require very high accuracy.
Especially the accuracy of punch tip and die shoulders. Cause these parts will directly contact the sheet metal during bending.
Moreover, the punches and dies with high precision can reduce the adjustment in the installation process.
Press brake dies to include V-die, U-die, and Z-die, and the most common is V-die. The minimum flange length shall be at least 4 times the material thickness.
Otherwise, the exact bending angle cannot be obtained. V-die sets with different opening widths match the corresponding punches.
In this way, the press brake can bend at different angles and different materials.
Press brake punches are mainly classified into three types: straight punch, gooseneck punch, and acute punch.
The die of the press brake can be divided into single V die, double V dies, and Multi-V die.
First, the type of metal you want to bend is an important factor.
The thickness of the metal determines the die opening, bending radius, and bending angle.
For example, some steels have greater strength and higher resistance than other steels.
This resistance is the tensile strength(UTS) of the metal. The tensile strength of metals is different, which requires different strength molds.
In addition, it needs to be considered that the length of the metal plate determines how many toolings are required.
When bending sheet metal, if the thickness and metal type are the same, there is not only one V-die opening size.
The sheet metal will not be lost during bending. If the internal radius is less than the thickness of the metal plate, the plate will be stretched, which will lead to the deformation of the workpiece. While a radius greater than the thickness of the sheet will not cause deformation.
When choosing the perfect V-die opening, we should not only avoid radius deformation but also choose a smaller radius.
The rule of 8
There is a rule of thumb applicable to the V-opening of press brake dies: the rule of 8.
The rule of 8 is based on 60000 PSI tensile cold-rolled steel. It stipulates that the V opening die shall be eight times the thickness of the bending material.
The rule of 8 applies to the most bending processes. Within the specified tonnage range, an internal radius approximately equal to the thickness of the material can be produced.
However, this is not a perfect law, because the factor will increase or decrease with the variation of the material thickness.
As a result, the width of some V-die openings is 6 times, 10 times, or even 12 times the thickness of the material.
The thicker plate is usually 10 times. Because thicker plates tend to lose some ductility.
So we use a larger V opening to distribute the force in a larger area and avoid cracks in the plate. Before determining the press brake dies, first determine the thickest and thinnest metal sheet to be bent.
Use the rule of 8 to determine the correct size of the V dies.
Select the smallest V to die and double its size to determine the next V die until the maximum mold is reached. If an exact match cannot be found, the dimensions should be rounded to the nearest available mold.
V opening affects the radius of bending material.
It is ideal on most bending materials when the internal radius equals 1 thickness. If the inner radius is less than 1 thickness, it means that the material extracted from the radius disappears.
In plate bending, if the inner radius is less than 1 thickness, we can see how the "side bulge" appears at the bending.
The larger the V-die opening, the larger the radius of the metal plate.
However, the tensile strength of the material will also affect the radius.
On a given V-die opening, the stronger the material, the greater the radius.
On mild steel, the bending radius (R) is usually 1 / 8 of the V-die opening, resulting in the following formula: R=V/8
This rule will vary for different metal types.
When selecting V-shape dies, pay attention to the flange length or leg required by the workpiece.
When bending, the sheet metal must always be in direct contact with the shoulder of the die.
Less than the specified flange length will fall into the V-shape opening.
If so, the bending result will be inaccurate.
Therefore, the larger the V-shape opening, the larger the minimum flange or leg on the metal plate.
The minimum flange formed by V-die is about 70% of the opening of the standard V-die.
The acute angle die can reach 110% or more of the V-die opening.
Before determining the minimum flange length, the sheet metal should be placed on the die.
In this way, the material contact on the die shoulder is equal to 20% of the V-die opening.
Correct tooling selection and material use can improve the accuracy of bending workpieces.
They will affect the bending angle, internal radius, minimum flange length, and the appearance of the whole workpiece.
Using the correct tooling can improve bending efficiency, reduce cost, prevent profile deformation, and protect the safety of press brake operators.
The press brakes process the sheet metal by applying force to the punches and dies.
Press brake tonnage stands for the maximum bending force or bending capacity of the press brake during bending materials.
When selecting a press brake, the most important thing is to determine the size of the press brake according to the bending force and total bending length.
The bending force determines the working capacity of the press brake.
In addition, the actual working tonnage cannot exceed the working capacity of the press brake and the maximum bearing capacity of the die.
The actual tonnage is affected by many factors, such as bending radius, bending method, materials thickness, material tensile strength, die ratio, friction between material and die, the rolling direction of the steel, work hardening, and so on.
Generally speaking, the greater the thickness and hardness of the sheet metal to be bent, the higher the working tonnage, the thinner the sheet metal, and the lower the tonnage.
Using different metal bending methods will lead to different tonnage.
For example, in air bending, the tonnage can be increased or decreased according to the change of die opening width. The bending radius affects the opening width of the die.
In this case, we need to add a method factor to the formula.
When using the bottom bending and coining method, the tonnage required is larger than that of air bending.
If the tonnage of bottom bending is calculated, the tonnage per inch of air bending needs to be multiplied by at least 5 times; If coining is used, a larger tonnage than the bottom bending may be required.
We have learned that in air bending, the larger the die opening is, the smaller the tonnage is.
The smaller the opening is, the larger the tonnage is.
Because the width of the die opening determines the internal bending radius.
The smaller the die radius, the larger the tonnage required.
In air bending, the die ratio is 8:1, that is, the opening distance of the die is 8 times the material thickness.
At that time, the material thickness is equal to the internal bending radius.
In air bending, the punch needs to pass over the opening of the bottom die to bend the sheet metal.
If the surface of the metal plate is not lubricated, the friction between the die and the sheet metal will increase.
The tonnage for bending the sheet metal will be greater. What’s more, this will reduce the springback of the material.
On the contrary, if the sheet metal surface is smooth and lubricated, the friction between the die and the sheet metal will be reduced.
The tonnage for bending the sheet metal will be lower.
However, it will increase the springback of the sheet metal.
The tonnage is also affected by the bending speed. As the bending speed increases, the tonnage required will be lesser.
Increasing the speed can also reduce the friction between the die and the sheet plate.
However, this will increase the springback of the sheet metal.
Tonnage is the force applied by the press brake to the metal plate.
Therefore, the thickness and tensile strength of sheet metal determine the range of bending force.
Each material has different tensile strength.
Tensile strength refers to the maximum stress that a tensile material can bear under a steady load.
If this stress is applied and maintained, the material will be broken.
Typical tensile strengths of some materials
The greater the thickness of the material, the greater the tonnage required, and vice versa.
The bending length of the press brake workbench is the maximum length that the metal plate can be bent.
The bending length of the press brake should be slightly longer than the material to be bent.
If the length of the workbench is incorrect, the die or other components may be damaged.
Press brake punch is also a factor to be considered.
These punches also have load limits. Right angle Vee punch can bear a large tonnage load.
Due to the small angle and fewer materials used in the manufacture of acute angle dies, such as gooseneck die, they are not inclined to withstand heavy loads.
When using different dies, their maximum bending force must not be exceeded.
Press brake tonnage can be determined by a press brake tonnage chart.
Press brake tonnage chart
The tonnage in this table is based on the material tensile strength of σb＝450N/mm2.
The value in the table is the bending force when the length of the metal plate is 1m.
For example, if S=5mm, V=40(the width of the V die opening is 8-10 times the thickness of the sheet), we can see the value in the chart is 400.
From the chart, we can find that bending a 5mm thick and 1m long sheet metal, the tonnage of press brake is 400KN.
Press brake tonnage also can be calculated by the tonnage calculation formula:
The calculation result of this formula is approximately equal to the value in the tonnage chart.
When the bending materials are different, use the coefficients in the following table to multiply the calculated results.
You can use the tonnage calculator below to obtain the results directly.
No matter what method you choose to determine the tonnage, do not exceed the tonnage range of machines and dies.
Using the wrong tonnage may damage the die or working components.
In the worst case, it may cause deformation of the machine and even affect the safety of bending operators.
K factor, bend allowance, and bend deduction are important values used to calculate the correct sheet metal flat length or flat pattern.
The length of the sheet in the bending state is different from the length of the flat pattern.
Because the sheet metal will stretch and compress during bending.
In this article, we will talk about the K factor, bend allowance, and bend deduction.
First, we need to understand the neutral axis. When the sheet metal is bent, the bottom surface is compressed and the top surface is stretched.
The neutral axis is located inside the metal where it will neither be compressed nor expanded, so the neutral axis can maintain a constant length.
In flat sheet metal, the neutral axis is evenly located at half of the thickness of the sheet metal, but it will move when bending.
The position change of the neutral axis is determined by the material properties, thickness, bending angle, internal radius, and bending method of the plate.
Mathematically, the K factor is the ratio between the position of the neutral axis (t) and the plate thickness (T).
Where t is the distance from the inside surface to the neutral axis and T is the metal thickness(Figure 1).
The K factor is determined by the physical properties of the material, bending method, bending angle, etc.
It is usually greater than 0.30, but not more than 0.50.
In precision sheet metal manufacturing, the K factor is a very important factor.
The K-factor is used to calculate the bending flat pattern, which is directly related to the length of the sheet metal stretched by the bending.
It is the basic value for calculating the bending allowance and bending deduction.
Because the ratio of the distance to the neutral axis to the plate thickness is the position of the neutral axis in the metal plate.
Therefore, knowing the K factor can determine the position of the neutral axis after bending.
You can also determine the K factor through the table below:
The Bend Allowance (BA) is the bending arc length measured along the neutral axis of the metal plate. Because the length of the neutral axis will not change after bending.
Once the bend allowance is calculated, it needs to be added to the flat length to calculate the sheet metal length required to form the desired workpiece.
As is shown in the below figure:
The following formula is used to calculate the flat length:
Sheet Metal Flate Length=Leg Length 1 +BA + Leg Length 2
A - Bend angle
R - Inside radius
K - K factor
T - Material thickness
After bending, the flange length, that is, the total length is greater than the length of the sheet metal flat pattern length.
Bending deduction is the length of material that we remove from the total length of the plate in order to obtain the correct flat pattern.
Bend Deduction Calculation Formula:
According to the figure above, the bend deduction is the difference between the bend allowance and twice the outside setback.
Bend Deduction = 2 × OSSB - BA
In the process of bending, the oil cylinder at both ends of the press brake drives the ram to apply pressure to the workpiece for bending.
The servo valve above the left and right oil cylinders and the positioning device below the oil cylinders can control the lifting position of the oil cylinder.
During each bending, the servo-hydraulic system controls the position of the oil cylinder through preset parameters.
Make sure the ram reaches the preset position of the controller, so as to achieve a more accurate bending angle.
However, when bending the metal plate, the two ends of the ram of the press brake are subjected to the maximum force, and the reaction force generated when the plate is bent deforms the lower surface of the ram.
As a result, both ends of the sheet metal are bent at the correct angle, but the deformation in the middle of the ram is the largest, especially when bending long metal plates.
As shown in the figure, when bending the metal plate, the ram of the press brake will be upward and the bed of the machine will be downward.
In order to improve the bending accuracy and eliminate the bending angle error caused by the deformation of the ram and workbench, it is necessary to compensate for the deflection deformation of the ram and workbench.
A compensation or crowning system can be installed to generate an opposite force to balance the deflection of the ram and the workbench.
This crowning system is usually installed for large sheet metal and high-strength bending because the deflection error of large sheet metal bending will be relatively large.
Before the invention of the compensation system, some press brake manufacturers used convex worktables to control crowning. But the compensation is less accurate.
Now, with the improvement of the CNC system, the crowning system is controlled by the CNC system.
Therefore, the operator only needs to input the length, thickness, bending angle, and other information about the bending.
The crowning system will automatically calculate the compensation values.
The system can store this information and directly reuse the data during the next repeated bending procedure.
The crowning system improves the bending accuracy and efficiency of small-batch workpieces.
For large tonnage and high-strength bending, the accuracy of the bending angle can be guaranteed.
Crowning is usually used for large-tonnage, high-strength press brakes.
Because the tonnage of the machine is directly proportional to the demand for deflection compensation.
Compensation can also be used for press brakes with lower tonnage.
The longer the length of the workbench and the ram of the press brake, the greater the deflection of the machine.
The commonly used crowning methods include hydraulic crowning and mechanical crowning.
Both of them will produce upward elastic deformation in the middle of the worktable to offset the deformation of the ram and the worktable.
Mechanical crowning can be an optional device for the press brake, while hydraulic crowning is a standard device for the press brake.
Hydraulic crowning requires a set of oil cylinders to be installed under the workbench of the press brake.
When the ram and the workbench deform during bending, the hydraulic crowning system transmits pressure to the compensation cylinder through hydraulic pressure.
Then the ram and the workbench will produce compensation deformation, so as to reduce the influence of machine deformation on the plate.
However, this hydraulic crowning system can not compensate for the whole workbench.
The local compensation depends on the position of the compensation cylinder.
Some hydraulic crowning systems only set one compensation cylinder in the center of the workbench, although there are also multi-cylinder systems.
Numerical control hydraulic crowning is to set the parameters according to the length, thickness, and other data of the bending workpiece in the numerical control system.
Then calculate the required compensation values through the machine computer system and transmit the command to the compensation amplifier.
The hydraulic crowning proportional valve receives the signal sent by the compensation amplifier to control the oil cylinders under the workbench.
Compensation is carried out to reduce the deflection deformation of the plate.
The hydraulic crowning system is complex, and there may be problems such as oil leakage, loose sealing ring, and so on.
These will affect the amount of hydraulic compensation each time, resulting in inconsistent plate processing each time.
The advantage of hydraulic crowning is that with the increase in service time, the machine will not have wear problems.
While mechanical crowning will have wear problems.
Mechanical crowning uses a wedge to compensate for the worktable.
Wedge blocks can be divided into single wedge blocks and multiple groups of wedge blocks.
The mechanical crowning system composed of multiple groups of wedge blocks has more compensation points than the three compensation points of ordinary hydraulic crowning, and there is no compensation blind area.
The mechanical crowning system can realize compensation along with the whole workbench.
The deflection can be compensated by convex operation at any position on the length of the whole worktable.
The folded workpiece has high precision and a small difference in plate processing each time, which is suitable for mass production.
Compared with the hydraulic crowning system, the mechanical crowning system has some advantages. Such as free of oil leakage, low failure rate, and environmental protection.
However, with the passage of service time, the wedge will be worn, which will affect the compensation effect.
High requirements for mechanical crowning operation. If the same workpiece needs to be bent several times, the worker needs to make real-time adjustments.
Even if workers have sufficient experience, unpredictable errors will occur. High requirements for mechanical compensation operation are needed.
If the workpiece does not need to be bent many times and the worker is skillful, mechanical crowning can be considered in terms of workpiece accuracy.
Bending is one of the important procedures in the sheet metal processing industry. It is the process of forming sheet metal into the desired profile by applying force to the workpiece.
The bending process is generally performed on the press brake - a mechanical processing tool that is mainly used for sheet metal bending and forming.
The bending process is mainly used for manufacturing parts and workpieces in various industrious fields. Bend parts can deal with small parts as well as large workpieces.
Due to the different thickness, hardness of the sheet metals, and different shapes of anticipated profiles. Therefore, we need press brakes with different tonnage and pressure to bend sheet metals.
Bending stretches and compresses the sheet metal. The external force will only change the shape of the metal plate.
The length of the outer part of the sheet metal will be elongated, while the inner part will be compressed and the length will be shortened. But the length of the neutral axis is unchangeable.
The ductility of sheet metal allows its shape to change, but other parameters remain unchanged, such as volume and thickness.
Although in some cases, bending may alter the external characteristics of the sheet metal. Additionally, bending can change the moment of inertia of workpieces. Tonnage is determined by the driving source of press brakes.
According to the different force application methods, press brakes can be primarily divided into mechanical press drive, hydraulic press drive, pneumatic press drive, and servo press drive.
What’s more, it is also necessary to match the punches (upper dies) and dies (lower molds) with different heights, shapes, and V-opening sizes.
Generally, the materials of bending dies are gray cast iron or low carbon steel. But the materials of punches and dies vary from hardwood to carbide according to the workpiece.
The sheet metal is properly placed on the bottom die. The punch is lowered on the die through the power of the ram.
The bending process will repeat the bending stroke several times to form desired profiles.
The metal plate will rebound slightly after bending.
In order to ensure that the predetermined bending radius and bending angle remain unchanged, usually during operation, the bending radius should be set to a value greater than the predetermined bending radius, and the final bending angle will also become smaller.
There are different types of sheet metal bending methods. These methods are based on the relationship of the end tool position to the material thickness.
The bending methods are also different in the method of plastic deformation of the plate.
Although the bending techniques are different, the toolings and configurations are basically the same.
Bending methods are also determined by the material, size, and thickness of sheet metals.
Bending dimension, bending radius, bending angle, bending curvature and bending position in the workpiece are also essential for the bending methods.
V bending is one of the most common types of sheet metal bending methods. It needs to be equipped with a V-shaped punch and die.
In the process of bending, the metal plate should be placed on the V-shaped die, and the punch presses the metal plate into the V-shaped die under the action of pressure.
The bending angle of the metal plate is determined by the pressure point of the punch.
The angles and shapes of the dies include acute angle, obtuse angle, right angle, etc.
V-bending can be subdivided into air bending, bottoming, and coining.
Air bending is also called partial bending because the workpiece is not in full contact with the die.
In air bending, the sheet metal is only connected with the shoulder of the die and the tip of the punch.
The punch is pressed onto the plate and passes through the top of the die into the V-shaped die opening, but does not contact the surface of the V-shaped opening.
Therefore, the distance between the punch and the sidewall of the die must be greater than the thickness of the metal plate.
Air bending is the bending method with the least contact with sheet metal.
The equipment only needs to contact the sheet metal at three points, namely punch, punch tip, and die shoulder.
Therefore, the correlation between bending angle and tooling angle is not so large.
The depth of the punch pressing into the V-shaped opening is the important factor affecting the bending angle.
The depth of the stroke, that is, the greater the pressing depth of the punch, the sharper the bending angle.
The bottom die and punch of air bending do not need to have the same radius, because the bending radius is determined by the elasticity of the sheet metal.
Air bending is the most widely used bending method because it has many advantages.
Because the punch tip doesn't need to be pushed past the surface of the metal, it requires less bending force or tonnage.
Additionally, it does not need too many tools, and the operation is simple and flexible.
However, air bending also has some disadvantages. Air bending will have a certain springback after bending.
So during bending, the actual bending angle should be sharper than the preset bending angle, so as to get the final bending angle.
Moreover, in air bending, because the metal plate and die are not in full contact, the bending accuracy is difficult to ensure. Its stroke depth cannot be kept very accurate either.
Bottoming is also known as bottom pressing, bottom bending, or bottom striking. Like air bending, bottom bending also requires punch and die.
In the bottom bending, the punch presses the metal plate to the bottom of the die, so the angle of the die determines the final bending angle of the metal plate.
The release of the punch will cause the sheet metal to spring back and contact the die.
Excessive bending helps reduce springback. Using more force will also reduce the springback effect and provide good accuracy.
The difference between air bending and bottom bending is that they have a different radius.
The die’s radius determines the inner radius of the bending sheet metal.
The width of the "V" shaped opening is usually 6 to 18 times the thickness of the sheet plate.
In the bottom bending, because the angle of the die is fixed, the bending accuracy is higher and the springback is smaller.
But a larger tonnage of force is required. Moreover, each bending angle, plate thickness, and materials need a separate die.
Coining is also a widely used bending method. The word “coining” comes from coin making.
In the United States, in order to print Lincoln's profile on a coin, a large tonnage machine is used to compress the coin to obtain the same image as that on the mold.
In coining, its punch and metal plate are at the bottom of the die.
The force produced by the punch is 5 to 8 times that of air bending. In this way, the sheet metal will hardly spring back.
The bending accuracy of coining is extremely high and the bending radius is small. Therefore, its cost for manufacturing is also very high.
However, in this bending process, the press brake and tooling are easy to be damaged by friction.
Moreover, more toolings need to be equipped. Basically, each plate thickness needs different punches and dies. Also consider the angle, radius, and die opening.
Before sheet metal bending, we must first make sure that what materials are good for bending.
Some metal materials have good ductility. These kinds of metals are more suitable for bending.
While some metals are less malleable or are brittle. They are easy to be damaged or broken during bending.
Metal materials like mild steel, annealed alloy steel, 5052 aluminum, copper, etc are malleable and easy to bend.
While some materials, such as brass, 6061 aluminum, and bronze are miserable to bend and are more likely to crack.
In the bending process, the sheet metal inner surface will be compressed and the outer surface will be stretched.
Because the metal plate has a good bendability, the compressed surface will produce a certain springback after the load is relieved.
As a result, over-bend is necessary when bending.
The bending radius affects the springback of the plate. The larger the bending radius, the greater the springback.
Using a sharp punch can reduce springback. Because the sharp punch has a small inner radius.
Bend allowance is the length of the neutral axis between the bend lines.
Once the bending allowance is calculated, it is added to the total flat length to obtain the material length required to produce the desired workpiece.
In order to reduce bending errors, bend allowance needs to be considered.
A press brake is a mechanical processing tool that is mainly used for sheet metal bending and forming.
The upper tool is usually named punch and the lower tool is called die.
Press brake machines utilize matching upper and lower dies to process flat sheets, usually metal sheets, into workpieces of different shapes and angles by means of different pressure generators.
During the bending process, the top die is fixed horizontally between side uprights by clamps, and the bottom die is mounted on the worktable.
The workpiece is fixed on the lower die, and then the punch is driven by the press generator to bend the sheet metal.
The molds have different shapes and the bending angles can be set in advance. Hence, different shapes and angles of metal sheets can be produced massively.
NC press brake machines are early conventional bending machines.
NC press brakes use the torsion bar to connect the Y-axis on both sides of the ram (left Y1 and right Y2) and to drive hydraulic cylinders on the uprights.
Then the ram is able to move up and down synchronously to bend metal sheets.
NC press brake is very suitable for low-cost, easy-to-operate workpiece bending but not high-precision and high-volume production
Since the NC press brake is mechanically synchronized, it cannot provide real-time feedback on the bending error and automatically adjust the error.
This will lead to poor bending accuracy.
In addition, the NC press brake drives cylinders up and down through the torsion shaft, and the long-term load will lead to the deformation of the torsion shaft.
CNC is the abbreviation for Computer Numerical Control.
CNC press brakes are essentially mechanical tools that integrate a computer numerical control system with hydraulic press brakes.
Generally speaking, CNC press brake is driven by a hydraulic or electrical system.
After equipping with the computer numerical control system, the press brake is able to effectively and precisely bend metal materials into various desired profiles.
Hydraulic press brakes occupy the vast majority of bending equipment use share. It is the most widely used bending equipment in the bending industry.
The hydraulic press brake is powered by the hydraulic system. Y1 and Y2 axis control oil cylinders directly drive the ram to do the synchronous movement.
Hydraulic press brake has a long history of utilization and mature technology development.
During the bending operation, it is stable and reliable and is very suitable for large volume, heavy tonnage workpiece processing.
The purely electric CNC press brake is driven by the electric motor and does not use hydraulic devices or oil cylinders, so there is no problem with oil leakage.
Also, the motor only starts when bending is required and automatically shuts off when not in use.
This will reduce energy consumption and bending costs.
Electric press brake can provide accurate and fast bending operations.
However, an electric press brake is more suitable for dealing with smaller tonnages.
CNC press brake can be divided into two types according to the movement of the upper tools (punch) and lower tools (die).
It includes a fixed worktable (bottom), which fixes the lower tools (dies) on the table.
The upper tools (punch) are subjected to a downward force, and the upper and lower dies act together on the sheet metal to complete the bending process.
This type of press brake has the same parts as the first type of bending machine.
However, in this type, the upper part is fixed and the bottom part is the moving counterpart.
The bending preparation time of the CNC press brake is very fast, because there is a CNC system that accurately calculates the position of the ram and back gauge.
The CNC press brake also can checks for errors during the bending process, switching between different bending modes, positioning desired bending angles and length.
Additionally, the CNC system is able to calculate the correct bending sequence, repeating the bending action several times until the sheet metals are produced into profiles.
Overall, the CNC press brake is programmable for the entire bending process and is able to provide high precision, customized bending.
According to the different force application methods, press brakes can be primarily divided into mechanical press drive, hydraulic press drive, and pneumatic and servo press drive.
Although different types of press brake vary in characteristics, the main difference consists in the power running the machine.
Mechanical press brake:
The main parts of the mechanical press brakes include workbench, ram, electric motor, flywheel, clutch and brakes.
The flywheel is driven by the electric motor.
Furthermore, the flywheel is connected to the gear shaft through the clutch and then to keep the motion of the ram.
The brakes stop the movement of the gear shaft as soon as the drive shaft is disconnected from the flywheel.
Mechanical press brakes are relatively simple in components, so they are relatively easy to handle in maintenance and operation.
Additionally, mechanical press brake is able to deal with large tonnages, even two to three times higher than the rated value.
While mechanical press brakes are not very accurate. Because when the bending operation starts, the ram needs to complete the entire cycle.
The speed of the ram cannot be controlled either. This can be dangerous for the operator and may affect bending accuracy and waste workpieces.
Hydraulic press brake:
The hydraulic press brake drives the ram movement by two synchronized hydraulic oil cylinders.
Because of the high precision and safety of the hydraulic press brakes, they have a long history and are widely used in industrial production.
The safety device of the hydraulic press brake - light curtain makes the movement of the ram can be stopped at any time, and also can reverse the operation stroke and control the speed.
Hydraulic press brakes with CNC system can intelligently handle the bending of different materials, including thickness, length, tonnage, angle, etc.
Hydraulic press brakes are also divided into torsion shaft press brake, mechanical hydraulic press brake and electro-hydraulic press brake.
The disadvantage of the hydraulic press brake is that the bending cannot exceed the tonnage range of the rated value.
Pneumatic press brake:
The power source of the pneumatic press brake is mainly compressed air or gas. The air pressure generated by the gas is used to apply tonnage to the ram for bending.
The machine delivers compressed air to the cylinder or pipe connected to the pressure mechanism. When filled with gas, the pressure drives the tooling downward.
When the movement is over, the gas is discharged through the exhaust valve and the brakes return to the initial position.
The power provided by pneumatic press brake cannot be compared with hydraulic press brake.
But the pneumatic press brake is very fast and clean during operation.
Servo press brake:
The power of the servo press brake mainly comes from two synchronous servo motors.
The servo motors provide energy through belts and pulleys. The flexibility of the servo press brake is very high.
The stroke and speed of the ram are accurately controlled by the servo motors. Usually, the servo press brake is suitable for bending a small amount of customized workpieces.
Additionally, the tonnages that the servo press brake can carry are also relatively small.
However, the running sound of the servo press brake is very low and will not produce noise during operation.
When the bending starts, the servo motors come into running, otherwise, the servo motors will be closed. This may save power energy and reduce production costs.
Moreover, the servo press brake is not equipped with oil cylinders, so the problems of oil leakage and cleaning do not need to be considered.
The finger press brake is also called box and pan brake. It is usually used to bend specially shaped workpieces or workpieces that are already semi-finished.
As you can see from the name, box and pan brakes are used to make pans, boxes and other items.
Finger press brake mainly contains clamping with many parts (fingers) of different sizes.
If different shapes of workpieces need to be manufactured, it is only necessary to remove or replace these fingers according to the bending needs.
Be sure to check that the parts on the clamping are held in place by screws before performing the bending.
When bending a piece of sheet metal, bending of different widths and shapes can be achieved by simply adjusting the size of the top die.
After bending, the formed parts also need to hold in place with screws, rivets or welding. After long-term use, finger press brake is easy to wear.
Regularly lubrication and maintenance are necessary.
The horizontal press brake is suitable for high-precision bending, straightening, punching and shearing.
It can not only bend, fold, punch and notch sheet metal, bar and tube, but also can straighten defective profiles, shear and pierce metal plates and pipes.
Additionally, completely enclosed parts can be produced by using press brake.
Horizontal press brakes are able to bend tubes into different angles and shapes. Those parts and pieces can be used to manufacture furniture, cars, metal containers, railings and so on.
The horizontal press brake can cut sheet metal even faster than the shearing machine.
Horizontal press brake can also punch and drill holes for pipes, metal plates or profiles.
Shearing, widening and narrowing the ends of pipes, then connecting different size tubes, and using them for the production of furniture, water supply system, cars and so on.
A horizontal press brake has a wide range of functions and can perform various types of bending.
Accordingly, there are many kinds of tooling matching the special functions of the horizontal press brake.
The basic working principle of the press brake is to drive the ram to move through a different mechanism of power devices.
Under the preset bending angle, the upper tooling and the lower tooling are able to bend the sheet metal into different profiles.
Basically, the main parts of the press brake are: workbench, ram, the top die is called punch, the bottom tool is called die
Driving mechanism: flywheel or electric motor, clutch and brakes.
The sources of force driving the ram’s motion are mechanical, hydraulic, pneumatic press and servo motor. No matter what the power system of the brake is, the basic principle of bending is the same.
Only the force is different, that is, the tonnage is different.
The larger the tonnage, the thicker the bendable material.
The bending operator needs to place the sheet metal on the bottom die and initiate the bending program for bending.
Take the mechanical press brake as an example.
After the ram and worktable are equipped with corresponding punches and dies, the machine can be started. The electric motor drives the rotation of the flywheel.
Then the flywheel is connected with the drive shaft through the clutch.
After that, the drive shaft connects the rotating flywheel with the ram and drives the ram to do upward and downward motions.
At that time, the workpiece is fed on the bottom die.
After the upper die and the bottom die jointly press the sheet metal, a workpiece is formed.
The hydraulic press brake mainly drives the ram to move synchronously through two oil cylinders on the side uprights.
The hydraulic press brake can stop and adjust the stroke and tonnage during the bending process.
However, different from the hydraulic press brake, the mechanical press brake must complete the whole stroke after the stroke starts.
Even the stroke can pause. but it cannot be reversed.
Press brake dies are very important for bending sheet metal.
The dies of the press brake include the upper die (punch) and the bottom die (die).
In the bending process, only the matched punches and dies work together on the metal plate can the final profile be produced.
In the bending process, extrusion and friction occur between the dies and the sheet metal. Long-term bending will cause wear to the die.
Because when the dies bend the metal plate, the huge pressure makes the temperature of the contact surface very high.
This will cause damage to the dies.
Press brake toolings can not deal with metal plates with high hardness and thickness, especially cylindrical workpieces.
Therefore, when selecting the die material of the press brake, we should pay attention to the hardness, heat resistance and wear resistance of the die material.
The hardness, thickness, length and ductility of metal plates should be considered as well.
Matching plate materials should be selected for the dies.
Generally, the bottom die is used according to the standard of 5 ~ 6T, and the length is longer than the metal plate.
When the material is harder and the thickness is larger, the dies with wider grooves shall be used.
When selecting the punches, the angle of the workpiece should be determined according to the shape of the product, so as to select the appropriate punches.
There are many kinds of materials for press brake punches and dies.
At present, steel is the preferred material for making press brake dies.
For example, carbon tool steel, low alloy tool steel, high carbon high chromium or medium chromium tool steel, medium carbon alloy steel, high-speed steel, matrix steel, cemented carbide, steel bonded cemented carbide, etc.
These high-quality steels are made by special heat treatment, with high hardness, not easy to wear and strong load capacity. But it must not exceed the limited pressure that the dies can bear during bending.
90 degree dies, acute angle dies, beading dies, box-forming dies, channel-forming dies, corrugating dies, curling dies, four-way die blocks, gooseneck dies, hemming dies, multiple-bend dies, radius dies, rocker-type dies, rotary bending dies, seaming dies, tube, and pipe forming dies, u-bend dies, and V-dies.
Press brake is mainly used for the bending and forming of metal plates. In the past, workers can only bend metal plates by pounding them manually.
With the continuous development of science and technology, mechanical press brakes, hydraulic press brakes and electric press brakes have entered the market one after another.
Currently, press brakes are widely used in various fields of processing and production to improve production efficiency.
Press brakes are mainly used for metal processing and manufacturing in aerospace, automobile, marine industry, agriculture, energy, military, transportation and other fields.
In Old English, "brecan", "break", "brake" and "breach" are cognate words. "break" is "breken" in Middle English, which means "destroy, break, fragment and bend".
While "brake" develops from "breken" and "break". Therefore, their meaning is also very similar.
In the middle ages, people used "brake" to represent a tool used to pound and crush grain. Later, "brake" gradually became synonymous with “machine”.
Therefore, people called the machine used for pressing as "press brake".
"Press" in Medieval English means "press, strike, hit, pound".
Later, people used "press" to represent a machine used to squeeze clothes or juice.
Therefore, "press" means a tool that can apply force to an object.
"Press brake" in modern machines means a machine that applies force to bend metal plates.
After 20 years of development, we have grown into a leader in sheet metal cutting and bending machine tool manufacturing enterprises.
In the past, we have been constantly updating our product technology, enterprise management and operation mode. It is precisely because of these measures that we have become the top five enterprises in China in this field.
With the development of enterprises, we also realize that brand plays a more and more important role in this development process. The brand can help enterprise development, which in turn enhances the popularity of the brand in the industry.
Therefore, we carried out drastic reform, overturned many previous things and faced the market with new design.
First, let's start with logo design.
Let's take a look at our new logo:
ADH is the abbreviation of our company name (old), which symbolizes our enterprise.
The newly designed logo has the following four points for external transmission:
At the same time, the new logo should reflect the machines we produce, so our designer made the following design:
Through the above pictures, I think you must understand what ideas our logo is designed based on. So what about the actual application scenario? Please see the following group of pictures:
That's all for the logo design.
For brand design, this is a beginning, and for our internationalization road, this is a new journey.
ADH hopes to conduct in-depth cooperation with agents and users all over the world, work together for win-win results and create a better future.
If you have any questions about our company and products, please contact us!