3 roller plate bending machine

Pollution control and purification of hydraulic oil for 3 roller plate bending machine

Pollution control and purification of hydraulic oil for 3 roller plate bending machine

1、Pollution control of hydraulic oil in 3 roll plate bending machine

The working life and reliability of hydraulic components are mainly determined by the pollution tolerance of components and the pollution degree of hydraulic oil of three roll bending machine. In order to ensure the service life and reliability of components, the pollution control measures can be taken to achieve a reasonable balance between the pollution degree of hydraulic oil and the pollution tolerance degree of key hydraulic components, which is the basic content and purpose of pollution control.
There are two ways to improve the working life and reliability of components: one is to develop pollution resistant components to improve the pollution resistance of components by improving the design parameters, structure and material of components; The second is to take pollution control measures to reduce the degree of pollution of hydraulic oil in three roll bending machine. Experience shows that the latter is a more economical and effective way.

In order to effectively control the pollution of the hydraulic system, the following measures are mainly taken: 1) cleaning the components and system, removing the residual pollutants in the process of processing and assembly. 2) Take measures to prevent pollutants from invading the system and control pollutants from outside. 3) High efficiency oil filter is used in the hydraulic system to continuously filter out the pollutants generated inside and intruded from outside.

2、 Purification of hydraulic oil for 3 roll plate bending machine

Prolonging the service life of the hydraulic oil of the three roll bending machine can not only save the cost of replacing the hydraulic oil of the three roll bending machine, but also save the oil resources. At present, due to the imperfect pollution control measures in some industrial sites, the hydraulic oil of the three roll plate bending machine in the hydraulic system is seriously polluted, which affects the normal operation of the equipment. Therefore, the method of frequently changing the oil has to be adopted. In fact, the dirty oil replaced is only polluted beyond the limit, and the physical and chemical properties do not reach the degree of deterioration. This kind of hydraulic oil can still be used after proper treatment. The experience shows that improving the cleanliness of hydraulic oil of three roll plate rolling machine through pollution control can significantly delay the deterioration of hydraulic oil performance of three roll plate rolling machine, and the service life of hydraulic oil of three roll plate rolling machine can be extended by 3-5 times. The Japanese industry has put forward that the service life of the hydraulic oil of the three roll bending machine can be extended to 10 years through the purification measures of the hydraulic oil.

Purification method Principle Application
filter The use of porous media to filter out insoluble substances in oil Separation of solid particles
centrifugal The fluid can be moved in a circular way by mechanical means of separating insoluble substances with different density by using the radial acceleration generated Separation of solid particles and free water (centrifuge)
inertia The oil can move in a circle by hydraulic pressure, and the insoluble substances with different density can be separated by radial acceleration Separation of solids and free water (cyclone)
magnetic Using magnetic force to absorb ferromagnetic particles in oil Separation of ferromagnetic particles and debris
static electricity The insoluble pollutants in insulating oil are adsorbed on the dust collector in electrostatic field by electrostatic field force Separation of solid particles and colloidal substances
vacuum Use the difference of saturated vapor pressure under negative pressure to separate other liquids and gases from oil Separate free and dissolved water, air and other volatile substances
Coalescence Based on the difference of wettability (or affinity) of liquid to a porous medium, the mixture of two insoluble liquids is separated Separation of free water and emulsified water from oil
adsorbent Separation of soluble and insoluble substances in oil by molecular adhesion Separation of solid particles, various states of water, colloidal substances
hydraulic ironworker machine

Advantages and basic operation of hydraulic ironworker machine

Advantages and basic operation of hydraulic ironworker machine


Hydraulic ironworker machine integrates intelligent mechanical equipment, mainly including metal cutting, steel plate processing, punching machine, and sheet metal bending. It is easy to use in the operation process, low energy consumption, low maintenance cost, and effectively saves the investment of assets. It is an ideal equipment for precision processing in intelligent processing industry; It is widely used in steel structure processing, hardware processing, grain machinery shell and large parts processing, thresher template support, trailer body mechanical parts processing, etc; There are many types of punching and shearing machines in the market, including hydraulic press combined punching and shearing machine, double hydraulic press combined punching and shearing machine, etc; The equipment is compact in structure, superior in performance, exquisite in appearance, convenient in use and safe in use;

In the operation process of the hydraulic ironworker machine, the first step is to check the switching power supply, and the next step can be carried out when the air switch is intact and the working voltage is stable; Next, open the equipment wiring cabinet for wiring, and then close the cabinet door tightly; Step 4: step on the foot switch. If the device doesn’t respond, switch the power supply of the switch when the emergency stop button is turned off; Then, the power needs to be cut off when the grinding tools are removed and replaced. Finally, after the work is finished, turn off the switching power supply and remove the slag.

Advantages and characteristics of hydraulic ironworker machine:

1. With hydraulic transmission, the whole machine has reasonable structure, light weight, low noise, light and reliable, and overload performance.
2. The machine is equipped with punching station, channel steel and angle steel cutting station, thick plate cutting station, round steel and square steel cutting station and corner cutting station. Optional purchase punching large hole, plate bending, channel steel punching, shutter and pipe corner cutting accessories.
3. Standard equipped with five stations and dual hydraulic workstation. Can work independently at the same time. The machine does not need any horizontal adjustment and can be used after it is placed in place. CNC control system is optional to increase automatic punching and shearing efficiency.
4. The machine adopts European processing technology, and the whole frame is welded. After high temperature quenching, the frame has high rigidity and high strength; The cutting tool is treated by special vacuum and high temperature to prolong its service life.
5. With pipe cutting die, the pipe can be cut and beveled, with high efficiency, cost saving and beautiful cutting section.

hydraulic punching and shearing

How to reduce the noise of Hydraulic punching and shearing machine

How to reduce the noise of Hydraulic punching and shearing machine

1. Ensure that the combined punching and shearing machine is always in good technical condition.
2. Ensure the integrity and reliability of the working parts of the punching and shearing machine. In particular, the exhaust pipe should be installed well, because most of the exhaust pipes are equipped with silencers, which will reduce a large part of the noise.
3. Prevent the parts from loosening, which will cause vibration.
4. Do a good job in the maintenance and inspection of the combined punching and shearing machine. Add qualified lubricating oil and grease according to regulations to prevent dry friction or semi dry friction caused by poor lubrication of relative moving parts and increase noise.
5. Keep good fit clearance relative to moving parts. The driver must assemble or adjust according to the technical requirements.
6. Do not change the oil supply quantity at will. If the fuel supply volume becomes larger, the fuel injected into the cylinder will not burn completely, which not only wastes the fuel, pollutes the air, but also increases the noise of the tractor.
The oil supply advance angle should be adjusted accurately. The accuracy of oil supply advance angle adjustment not only directly affects the power of the combined punching and shearing machine, but also affects the noise of the combined punching and shearing machine. We often meet some combined punching and shearing machine in the emission of exhaust gas when the sound is particularly loud, often accompanied by “Pa, Pa” sound, this is because the oil supply advance angle is too large.

what is a hydraulic ironworker machine

What is a hydraulic ironworker machine

What is a hydraulic ironworker machine


The hydaulic ironworker machine is a kind of machine tool equipment that integrates multiple functions such as metal cutting, punching, shearing, bending, etc. It has the advantages of simple operation, low energy consumption, and low maintenance cost. It is a modern manufacturing industry (such as: Metallurgy, bridges, communications, electric power, military and other industries) metal processing equipment of choice. Ironworker Machines are divided into hydraulic Ironworker Machines and mechanical Ironworker Machines, of which hydraulic type is the most widely used. The Hydraulic Ironworker Machine is generally suitable for processing small workpieces, and can work in multiple stations at the same time. The left foot switch individually controls the punching station, and the right foot switch controls the operation of other jobs at the same time.


The punching function is located at the left station of the Hydraulic Ironworker Machine and is controlled by the left foot switch. By changing different upper and lower molds, holes of different sizes and shapes can be punched. Each set of die has a certain life time, and the die needs to be replaced after the service life is exceeded. If the punching and shearing machine model is Q35Y-20, 20 is the maximum shearing thickness of 20mm.

The Hydraulic Ironworker Machine is widely used in:

1. Steel structure processing

2. Elevator and parts processing

3. Trailer—spare tire parts, trailer hinges, hooks, inserts, and wall plates

4. Construction machinery industry-processing on belt conveyors and mixing stations

5. Agriculture and animal husbandry machinery industry-threshing frame body, trailer body parts processing

6. Food industry machinery-slaughter equipment frame and parts processing

7. High and low voltage tower parts processing

8. Wind power equipment-parts processing on the stairs and pedals on the wind power tower

9. Machining-processing of building embedded parts, conveyor brackets and other parts that play a role in connection

10. Grain machinery-grain and oil equipment, starch equipment support, shell, small parts processing

11. Processing of railway wagons, automobiles and crane parts 12. Channel steel, square steel, round steel, H steel, I-beam and other steel materials cutting, punching, bending.


Before starting the machine, check whether the transmission parts of the punching and shearing machine and the connecting screws and pins are loose. Whether the electrical grounding is intact. 2. Lubricate the various parts before work, and start the trial run for two to three minutes before starting work without any problems. 3. Overload is not allowed, and punching and shearing of quenched steel is strictly prohibited. 4. Wear gloves and labor protection equipment when working. Sandals and slippers are strictly prohibited. 5. When punching and cutting, always add oil to the punch to prevent the upper and lower punch from skewing. 6. Pay attention to the safety of your }ngers when feeding the material, especially when the sheet material is not pressed by the presser foot at the end, punching is prohibited. 7. It is strictly forbidden to disassemble and proofread the cutting edge and punching die when starting up. Don’t hit punches, shears and other parts with force. 8. Strictly control the speci}cation range of the sheet material, and it is strictly forbidden to punch and cut when it exceeds. 9. The workplace must not accumulate other objects and a large amount of ~ushing materials, and must stop during adjustment and cleaning. 10. After the work is completed, shut down and cut off power in time to clean up the site.


1. Operate strictly in accordance with the operating procedures. 2. Add lubricating oil according to the requirements of the lubrication chart every time before starting up. The oil should be clean and free of precipitation. 3. The shearing machine must be kept clean frequently, and the unpainted part must be rust-proof grease. 4. The lubricating oil in the motor bearing should be replaced and re}lled regularly, and the electrical part should be regularly checked for normal, safe and reliable operation. 5. Frequently check whether the V-belt, handle, knob and button of the shearing machine are damaged. If they are severely worn, they should be replaced in time, and the spare parts should be reported for supplement. 6. Regularly check and repair switches, insurances, and handles to ensure reliable operation. 7. 10 minutes before the end of the day, lubricate and scrub the machine tool.

plate rolling machine

How to choose the right plate rolling machine for your needs

How to choose the right plate rolling machine for your needs


Although it is one of the most complicated fabrication processes, plate rolling is essential if you want to provide your customers with more bending options. However, unlike a press brake, which delivers a single bend in one direction of inertia, a plate rolling machine features multiple forces and different courses when the plate rolling process is taking place.

Plate rolling is an art, which needs an experienced operator who understands how to control all the intricacies of this sophisticated piece of equipment and the reaction the material he is working with will have. But besides having a skilled operator, it is also crucial that you match the right machinery to a particular job. This article provides some insightful tips on how to select the best plate roll for your plate rolling project.

For you to know which plate roller best fits your projects, you need to answer these questions:

Which types of materials will you be working with?

The first thing you need to do before you start searching for the best plate roll bender is to determine the type of materials you will be using in your project. Here, you’ll have to consider things such as thickness, width, diameter, strength and yield. These elements determine the amount of pressure you’ll need and the max and min diameter and width of the plate roller you’ll use.

What’s the minimum diameter?

Taking the thickest material you will be working and the minimum diameter you will be rolling that material down to will help determine the plate roll size. Plate rolls generally use the 1.5 rule, meaning that a diameter rolled can be no less than 1.5X the top roll diameter. Knowing the minimum diameter you need along with the yield strength of the material is critical in selecting the right plate roll.

Are you rolling only round objects or are you rolling out-of-round?

Any plate roll can produce the required round cylinders but when special shapes are required it takes a machine equipped with a CNC control to manipulate the rolls position in conjunction with the desired speed that the rolls are turning. Whether you’re rolling ovals such as fuel tanker trailer skins or some oyster non-round shape a CNC control will take all the guesswork out of roll speed and roll positions.

How large a diameter are you producing?

The larger the diameter rolled the more the need for additional supports around the plate roll. Most manufacturer’s offer side supports as an option to support the sheet being fed into the rolling process. However your application may also call for an overhead support if a large radius is required and the rolled sheet is being sent high into the air. The combination of side and overhead supports can assist in supporting the sheet during the process and avoid any back bending caused by the unsupported weight of the material itself.

How much are You producing?

For you to get the best plate roller machine, you need to know the quantity of your output. This will help you determine the type of plate roll machine that will resonate with these needs. The three and four roll machines are considered to be the best for massive projects, but they boast distinct operational complexity, accuracy levels, and features. You’ll have to choose whether you’ll prefer the three roll machines that are known for their versatility and affordability, or the four roll machines, which are swift, accurate, and precise.

ironwoker machine principle

Hydraulic ironworker evolution history

Hydraulic ironworker evolution history


The hydraulic ironworker was originally invented in 1949, but it never really entered the scene until 50 years ago when the patent was acquired and manufacturing of these metal fabricating machines in the U.S. began. Many of the earliest models are still operational on shop floors and in maintenance departments today.

For example, the first model produced by Scotchman was the 314, and we continue to get calls for replacement parts for that model. The original design was a hydraulic system, but it was powered only in one direction. It had a spring return. When the punch was engaged, the ram went down, and the spring pulled it back up. That coil spring was similar to one found in a ’57 Chevy at the time.

Fifty years later, we continue to sell dozens of those springs per month. So we buy the spring, compress it, and weld a frame around it for delivery to the customer. When the fabricator gets it, he drops it into the ironworker and cuts the frame to expose the compressed spring. That old hydraulic ironworker is ready for more work.

That’s no surprise. It’s a testament to how those ironworkers were made.

Mechanical ironworkers also were made to be long-lived. Unfortunately, they were very large, and while they still were somewhat functional, they ultimately found their way to the scrap heap to make way for more modern equipment.

Older hydraulic equipment didn’t stand out as much because it was smaller than the mechanical counterparts in many instances, yet it was able to deliver similar, if not more, force. As a result, these tools remained in use and avoided a second life as a boat anchor.

Hydraulic ironworkers may still look similar to those early models made a half-century ago, but they have evolved in several ways. It’s one of the reasons that companies keep placing orders for them and finding new ways to put them to use in manufacturing and maintenance settings.

Safety First and Always

In the late 1960s, when hydraulic ironworkers appeared on the scene, much larger mechanical models dominated the shop floor. Those mechanical ironworkers had huge flywheels that, when triggered, brought down the ram in a powerful and dramatic way. However, once it was triggered, nothing was going to stop it. It was going to come down and then go back up.

Those early hydraulic ironworkers could deliver similar force, but didn’t require all of the weight that the mechanical ironworkers did. However, you still had to respect the tonnage and power of the machine, even if it were smaller.

Modern hydraulic ironworkers have complete control of the entire stroke—both up and down. An emergency stop results in a halting of the fabricating or shearing action—unlike those older mechanical ironworkers, for which it was all about tripping the flywheel and staying out of the way.

A lot of this has to do with electric controls that govern the stroke. These controls have quicker cycle times and greater authority over the stroke than mechanical linkage stroke controls. Electric stroke controls use switches that send signals to the control valve almost instantly.

Also, the guarding standards for today’s ironworkers make it very difficult for an operator to expose his or her extremities at a pinch point of a properly designed ironworker. ANSI B11.5 standards provide the guidelines for guarding on an ironworker: It should be designed to allow material access to the machine, but prevent any part of the body from getting between the material being punched, sheared, or notched and the stripping mechanism.

Many More Options

Those first hydraulic ironworkers are just like the ironworkers of today: multifunctional machines (see Figure 3). In fact, the first models had a 35-ton punch, 3-in. angle shear, and a 7-in. flat bar shear. Those same punching and shearing functions, albeit in greater tonnages now, are still pretty much available on any ironworker made in the world today.

Those higher tonnages do make a big difference. It’s not unusual to see a 150-ton ironworker punching a hole in 1.25-in. steel plate. High-powered ironworkers also can shear 1-in. plate like it was butter.

Early on, these multifunctional devices demonstrated increased flexibility with the introduction of component systems that could be added to the original equipment. For instance, a basic ironworker could have had a simple channel shear station, but that later could have been switched out for another function such as press brake bending, tube shearing, or pipe notching. These types of components are designed to be quickly changed over to keep up with the high-mix work load often found in job shops and maintenance departments.

Following a European trend, hydraulic ironworkers emerged that had these additional functions fully integrated. Fabricators didn’t have to worry about switching out components. They could have the punch, flat bar shear, rod shear, rectangle notcher, and angle shear all built into one machine. Depending on the ironworker model, a fabricator also could see one of the functions replaced with a redundant function, such as another punch, or with something different, such as a press brake or pipe notcher.

Fabricators, of course, have always been interested in cost savings, so that led to the creation of dual-operator models. Originally, the ironworkers’ hydraulic system supplied power to only one function at a time. Down the line, manufacturers engineered the hydraulic systems to allow for two functions to operate at the same time, allowing a fabricator to purchase one machine, instead of two, and double productivity compared to a one-function-at-a-time ironworker.

Over the past several years, fabricators also have seen the addition of programmable stop systems applied to ironworkers (see Figure 4). More commonly used on saws, these belt-driven, computer-controlled systems move material to specific lengths in between fabricating activities on the ironworker. For example, such a system can be programmed to punch 10 holes in a 10-ft. part, and once the locations are programmed into the controller, the machine completes the job without operator interference. This eliminates the need for the operator to mark the individual holes and move the part himself in between punches, making for a more efficient punching process.

This sort of automation really stands out when the hole locations do not follow a distinct pattern. With variation comes an increased chance of rework if a human is involved. Computer-controlled punching jobs boost the quality level of these types of parts.

The Ironworker’s Future

What does the future hold for this venerable piece of equipment? The hydraulic-powered ironworker’s versatility has enabled it to remain a viable tool even as manufacturing in the U.S. has moved from high-volume production to more high-mix, low-volume scenarios. If ironworkers can remain relevant after that type of shift, that bodes well for the tool’s future.

All you have to do is look at where ironworkers are used. They remain the only fabricating machine tool that can be found in the third story of New York’s Metropolitan Opera House, where they build set pieces, and also in the maintenance shops of the world’s largest automotive manufacturers. They have evolved to meet the fabricating needs of modern manufacturers, no matter where they might be or what they might do, and that likely will be the story 50 years from now as well.

hydraulic ironworkers

Hydraulic ironworkers Five benefits in fabrication work

Hydraulic ironworkers Five benefits in fabrication work


Hydraulic Ironworkers are a valuable tool in any Fabrication shop. They are an easy- to- use machine that tackles a number of different tasks. These three-in-one machines combine the functions of punching, notching and shearing. They vary in size and capacity, and are available as single or dual operator systems. Their convenience, ease of use and function has made them a staple in many fabrication environments.Ironworkers are built to handle jobs that fabricators and manufacturers regularly face. They are three-in-one machines that work as shearing, notching, and punching.

5 benefits of hydraulic ironworker machine

1. Time Saving

By having the ability to perform multiple processes on one machine, ironworkers save time, increasing efficiency. Instead of using a different machine for each function, with an Ironworker an operator can continue doing multiple processes in the same location. Ironworkers also can come with multiple tooling options that can be quickly changed, resulting in time saved.

2. Space Saving

Ironworkers combine the functions of three machines in one; Punching, shearing and notching. Instead of having three machines for three specific tasks, iron workers allow you to complete all these processes in one location. Having one machine instead of three creates valuable space in a fabrication shop.

3. Waste Reducing

An ironworker will allow the operator to get closer to the work whether it is punching, shearing, notching or a forming job, thereby improving the precision and the quality of the work. Unlike traditional punching, notching, and shearing techniques which yield a lot more waste, an ironworker can reduce this problem.

4. Safety First

Ironworkers offer a safer operation then some of the machines they replace. Most Ironworkers today come with some guarding around them to prevent accidents.

5. Cost Saving

Ironworkers are a cost saving alternative to other machines for a host of reasons. It is less expensive to purchase one Ironworker Machine then it is to purchase the three machines it is replacing. Ironworkers can also save money as a result of their smaller space requirement, faster operation speeds and waste saving benefits.

The benefits of Ironworker make them ideal for both smaller shops with fewer workers as well as for busy shops that need every productivity advantage they can get. For fabricating operations of all sizes, an ironworker machine can be a valuable asset that yields both short and long term benefits.

plate rolling machine

Upper Roll Universal Rolling Machine – Technical Characteristics Analyse

Upper Roll Universal Rolling Machine – Technical Characteristics Analyse



The upper roll universal rolling machine adopts hydraulic transmission for moving the upper roll, hydraulic transmission for the horizontal movement of the lower roll, and electric centralized control operating system. The machine can complete the pre-bending of several rolls at both ends of the plate at one time, and it can also carry out the metal plate. Certain plastic leveling, direct pre-bending, save trouble, save materials, configuration, system control, and improve the degree of automation. This machine is widely used in processing with high precision requirements.





Universal rolling machines are divided into: large, medium and small.


  • Large upper roll universal plate rolling machine

The main features of the large upper roll universal bending machine: unique bending process with superior product accuracy, high-precision end pre-bending, continuous bending without back angle, digital control of the bending process, man-machine dialogue control interface, efficient and intelligent operation of the physical bending process software, Man-machine dialogue window, automatic compensation during bending. Single-person operation, efficient, safe, convenient and rich in curved shapes with rolled O-shaped, U-shaped, multi-segment R and other different shapes.


  • Medium-sized upper roller universal plate rolling machine

The main features of the medium-sized upper roll universal bending machine: unique bending process with superior product precision, high-precision end pre-bending, continuous bending without back angle, digital control of the bending process, man-machine dialogue control interface, efficient and intelligent operation of the physical bending process software, Man-machine dialogue window, automatic compensation during bending. Single-person operation, efficient, safe, convenient and rich in curved shapes with rolled O-shaped, U-shaped, multi-segment R and other different shapes.



  • Small upper roll universal plate rolling machine


The main features of the small upper roll universal bending machine: unique bending process with superior product precision, high-precision end pre-bending, continuous bending without back angle, digital control of the bending process, man-machine dialogue control interface, efficient and intelligent operation of the physical bending process software, Man-machine dialogue window, automatic compensation during bending. Single-person operation, efficient, safe, convenient and rich in curved shapes with rolled O-shaped, U-shaped, multi-segment R, etc. [1].


Technical characteristics of the upper roll universal rolling machine


  • The drum-shaped upper roller and the lower roller under the lower roller are coordinated and adjusted to achieve high-precision product straightness


Adopting drum-shaped upper roller.The upper roller drum-shaped preset amount is generally 70% of the uniformly distributed load of the roller. The lower roller with a smaller diameter is supported by an up-and-down adjustable idler roller at the lower part of the lower roller. According to the load of the rolled product, adjusting the idler under the lower roller greatly improves the straightness of the product.


Universal plate rolling-Coordination and adjustment of the lower roller of the lower roller


  • Curved and rolled rear, high-precision roundness


The upper roll universal rolling machine adopts rear bending (the feeding direction of the sheet is opposite to the moving direction of the upper roll). The upper roll is pressed down while the lower roll rotates, continuously bending, and the end of the sheet is directly pre-bent. , to avoid the generation of the front bend angle, and can control the length and shape of the remaining straight sides.


Generally, the three-roll asymmetric type adopts forward bending. First, the two ends of the sheet are pre-bent, and then symmetrically rolled into shape. Skilled operators are required. The product has a back angle and the shape of the remaining straight edges is difficult to control.


  • Reduce the amount of product misalignment


The upper roll universal rolling machine has taken the following measures to reduce the amount of product misalignment:

①The dimensional accuracy and shape tolerance of the center distance between the two lower rollers and the two lower rollers are used as key process control;

②The synchronous electro-hydraulic combination of the upper roller adopts a feedback system to automatically level.


The upper roll universal bending machine reduces the amount of product misalignment


  • High-precision end pre-bending

When the end is pre-bending, the horizontal movement of the upper roller can be changed, and the length of the straight side can be set freely; the upper roller is directly pressurized to control the shape of the straight side to achieve high-precision end pre-bending.


Scope of Application


The machine is widely used in industries with high precision requirements, such as: aviation, nuclear power and other metal structural parts manufacturing industries and chemical machinery, offshore oil platforms, oil, gas and water pipelines and other industries.

V groove of the lower die

The angle of the CNC press brake is not enough and the adjustment data is invalid. What is the reason?

The angle of the CNC press brake is not enough and the adjustment data is invalid. What is the reason?


There are only two possibilities for the bending angle not to copy in place:
1 The V groove of the lower die is too small. Generally, it is calculated as six times the thickness of the material. For a material of 1mm, a groove with a width of 6mm is used.
2 The down depth of the machine slide is not enough. The adjustment data is invalid because it is input into the CNC system and the execution of the system is invalid, or the system is executed and it has no effect when controlling the machine.
If it is an electro-hydraulic servo CNC bending machine, you can observe the grating ruler to see if the downward depth changes after adjustment.
If it is a torsion-axis CNC bending machine, you can manually adjust the Y-axis position to see if there is any change.

sheet metal bending formation

Analysis of the relationship between bending formation and grooving process

Analysis of the relationship between bending formation and grooving process


The traditional bending process is to use the two edges at the opening of the lower die and the top edge of the upper die to bend the metal sheet under the pressure of the upper and lower molds of the NC press brake. The sheet metal undergoes elastic deformation to plastic deformation. The bending angle is determined by the depth of the upper mold entering the lower mold. In today’s society, people have higher and higher requirements for the shape of the workpiece. Some workpieces with complex shapes can no longer be bent using traditional free bending, bending machine bending or even three-point bending technology, and traditional bending methods cannot control the bending. The radius of the rounded corners makes it difficult to achieve the process requirements for seamless bending. Therefore, a new type of bending process-grooving bending process came into being.

It can be seen from the bending process that the size of the edge arc radius of the workpiece after bending is in direct proportion to the thickness of the sheet. The thicker the sheet, the larger the radius of the arc formed by bending. After V-grooving the metal sheet, the remaining thickness of the sheet becomes half of the original thickness, or even smaller, so that the edge arc radius after the workpiece is bent can be greatly reduced. In addition, since the remaining thickness of the bend is thinner after grooving, the deformation force during bending will be reduced accordingly, and will not spread to the unbent area. Therefore, there are no creases on the surface of the workpiece after bending, and due to bending The thickness of the board is thinner, and the pressure required during bending is reduced to avoid the risk of indentation on the decorative surface. In this way, the metal decoration of high-end places such as hotels, banks, commercial centers, airports, etc., has a small arc radius of the workpiece edge, no creases on the surface, and no indentation on the decorative surface.

In the bending process, the required bending force of the sheet metal is proportional to its thickness. The greater the thickness of the sheet metal, the greater the bending force required, and the required equipment tonnage increases accordingly. After V-shaped grooving is performed on the bending part of the sheet metal before bending, the remaining thickness of the sheet at that place is greatly reduced, so that the bending force required when the sheet is bent will also be correspondingly reduced, so that the thick plate can be in a smaller tonnage Bending on the bending machine. This not only reduces the investment in equipment, but also saves energy and space.

How to avoid the deviation of bending angle and size

For the bending process, the quality of bending mainly depends on the two important parameters of bending angle and size. When bending, in order to ensure the forming size and angle of the bending, the following issues need to be paid attention to.

⑴ The upper and lower molds are not aligned with each other, which will cause errors in the bending dimensions. The upper and lower mold tools need to be aligned before bending.

⑵ After the left and right positions of the rear stopper are moved, the relative position of the sheet metal and the lower die may change, which will affect the bending size. The position distance of the rear stopper must be re-measured before bending.

(3) Insufficient parallelism between the workpiece and the lower die will cause bending springback and affect the bending angle. The parallelism must be measured and adjusted before bending.

⑷ When the angle of the first bending is insufficient, the second bending will also be affected. The accumulation of bending errors will increase the forming size and angle errors of the workpiece. Therefore, it is particularly important to ensure the accuracy of single-sided bending.

⑸When bending, the size of the lower die V port is inversely proportional to the bending pressure. When processing metal plates of different thicknesses, you need to select the appropriate lower die V-groove according to the regulations. Generally, 6-8 times the plate thickness is the most appropriate .

⑹ When the workpiece is bent on the bending machine after planing the V-shaped groove, ensure that the edge of the upper die, the bottom edge of the V-shaped groove of the workpiece and the bottom edge of the V-shaped groove of the lower die are on the same vertical surface.

⑺ When bending the workpiece after grooving, in order to prevent knife clamping, the upper die angle is best controlled at about 84°.

grooving process, as a new type of bending process, is the result of market choice. With the continuous development of process technology, enterprises have higher and higher requirements for process personnel. As craftsmen, only by mastering various processing techniques can we produce better products; only by constantly exploring and pursuing new techniques can we produce better products.