The Basic Guide to Bending Machine

What Is A Bending Machine?

A bending machine is a machine used for bending and forming workpieces.

There are many types and functions of bending machine, which can be used as a press or a bending machine

Some bending machines can directly process sheet metal without clamping tools.

And some bending machines need clamping tools to assist in bending.

The metal sheet is fixed by the clamping device and will not move during the whole processing process.

The bending machine uses the bending tool to process the metal plate and manufacture the profile.

Special materials shall be used for the machine body and tools of the bending machine.

This can ensure that the machine body and toolings are not damaged by pressure during processing.

Types of Bending Machine

There are many types of bending machines, including Pipe bending machine, Sheet metal bending machine, Sheet folding machine, Hydraulic bending machine, Mechanical bending machine, Electric servo bending machine, Electric pipe bending machine, Cutting and punching machine, etc.

Pipe bending machine

What Is A Pipe Bender

A pipe bender is a machine used for rolling and bending metal pipes and profiles.

The profile is a square or rectangular thick long metal.

Bending is a stretching process, and there will be friction between the toolings and the pipes.

In order to prolong the service life of the toolings and the pipe bender.

Drawing oil can be used to reduce the resistance between the pipe and the bending tools.

Pipe bending and manufacturing equipment are used to perform bending, swaging, flaring, and crimping operations.

Stainless steel, iron, copper, aluminum, titanium, and carbon steel can be bent by the pipe bender.

Metal materials have ductility and small elastic deformation, which can support the structure of the bending section.

The pipe processed by the pipe bender has a smooth curve, no collapse outside, and no fold inside.

The pipe is a hollow container, which is used for the transportation of gas, solid, and fluid in industrial, medical, and other equipment.

The pipe bender is mainly used for laying pipes in buildings, highways, railways, bridges, etc.

Structure of Pipe Bending Machine

The pipe bending machine is composed of the clamp die, bend die, pressure die, wiper die, and mandrel.

The die of the pipe bender is generally made of hardened steel to prevent damage.

However, molds such as scrape molds are made of aluminum or brass to prevent damage to the pipes.

Bend die

Bending die is an important part of the rotary drawing process, also called radius die.

Because the bending die determines the inner radius of the pipe, and it is round.

The bending die holds the pipe and bends it during the drawing process.

Clamp Die

The clamp die is used to assist the bend die to press the pipe onto the bend die.

The clamp die can prevent the pipe from sliding when the bending die rotates.

Wiper die

The function of the wiper die is to prevent the inner radius of the pipe from being folded and the outer surface from being damaged.

After the processing of the bending die, the pipe will be plastically deformed and may be wrinkled.

In terms of that reason, the wiper die is used to smooth the pipe surface.

To prevent damage to the pipe, the wiper die is made of a softer alloy, such as aluminum or brass.

Pressure die

The pressure die is used to apply pressure to the pipe to ensure the curved profile of the pipe.

Mandrel

Mandrels are used to support the bending of small radii, thin tubes, and hard materials.

When these pipes are bent, they are prone to wrinkle inside and collapse outside.

This can be prevented by the mandrel working with the wiper die.

How Does A Pipe Bending Machine Work?

When bending the pipe, it is necessary to push the pipe into the pipe bending machine through pressure.

The driving force of the pipe bending machine can be hydraulic drive, electric servo, pneumatic or manual.

The clamping block and the forming tools clamp the pipe in place and adjust it to the die shape.

After the pipe is clamped, it is fixed in place when its end rotates and rolls around the die.

There are also some processing methods, such as bending pipes to form profiles through rollers.

When the pipe is bent, the mandrel is placed inside the pipe to prevent the inside of the workpiece from folding and collapsing.

The scraping die of the pipe bender can maintain the tension of the pipe and avoid damage when force is applied to the pipe.

The wiper die is generally made of aluminum or brass to prevent scratching the raw material.

Bending methods of pipe bending machines include press bending, rotary draw bending, compression bending, roll bending, mandrel tube bending, wiper die bending, heat induction bending, sand packing and hot slab forming, and ram bending.

Metal Sheet Bending Machine

A sheet metal bending machine is used to process sheet metal into profiles.

The metal sheet is first placed on the lower die of the workbench.

Then the punches are pressed into the lower die to complete a bending stroke.

The power system drives the slider to move, and the slider drives the punch to move downward.

The folding machine can bend metal sheets or pipes at any angle.

The machine specialized in bending pipes is a pipe bending machine.

The folding machine is suitable for processing some large workpieces that are difficult to be processed by other machines.

The power system drives the clamping shaft to fix the workpiece to a specific position.

After the workpiece is fixed, the folding arm of the swing beam will be driven in an arc to bend the flange to the required angle.

Plate Rolling Machine

Pyramid type mechanical plate bending machine is used for metal plate bending and forming.

Its bottom is driven by motor and gear and can roll.

The upper roller has the required bending radius manually adjusted up and down.

The steel plate bending machine has a double-sided pre-clamping device.

Its unique structure allows the two bottom rollers to clamp the workpiece in advance.

The upper roller is a roller fixed and pre-clamped by two lower rollers through hydraulic cylinders.

Листогибочный пресс

The листогибочный пресс is a kind of bending machine used for bending metal plates.

There are many kinds of press brakes with different power systems.

At least three shafts on the rear gauge of the press brake.

Therefore, the accuracy, speed, and stroke of the press brake are controllable.

The press brake is easy to operate and is capable of processing workpieces in batches.

Introduction of Press Machine

The press machine is the general name of the machine in the sheet metal manufacturing industry.

It can also be called a forming press or a mechanical press.

After the workpiece is designed, the operator can use the press machine to manufacture the workpiece.

The press machine uses pressure to bend and press the sheet metal.

A press machine is a machine used for sheet metal processing. It usually has a frame and a base.

The press machine is also provided with punches and dies, which are respectively installed on the ram and the workbench.

The press machine applies pressure to the metal plate by driving the punch through the power device.

Press machines can be divided into different types according to the power system, capacity, etc.

Different press machines process the workpiece through different dynamic mechanisms.

The structural design of the press machine includes the C-frame press, screw press, etc.

There are many kinds of press manufacturing processes, such as die cutting, forging, and stamping.

The power sources of the press include hydraulic, pneumatic, and mechanical.

In this article, we will introduce the definition of the press machine and different kinds of press machines.

The Driving System of Press Machine

The driving system of the press machine is an important device to drive the machine to work.

The hydraulic press machine drives the ram movement through the hydraulic cylinder and the piston rod.

It is generally installed on both sides of the press machine to drive the ram to move upward and downward.

The hydraulic system can continuously withstand large tonnage loads and longer strokes.

The mechanical drive system includes the crank, flywheel, eccentric, knuckle joint, etc.

The flywheel rotates and moves to connect the crank to drive the movement of the ram.

The mechanical driving force at the end is very strong, which is very suitable for blanking and stamping.

The power of the pneumatic press machine comes from the movement of compressed air.

The structure of the pneumatic press machine is relatively simple, and it only generates pressure through compressed air.

The advantage of the pneumatic press machine is that it is fast and can drive the ram quickly.

Types of Press Machine

Press machines can be classified according to different standards, including mechanical (hydraulic, pneumatic, etc.); Stamping (forging, punching, etc.).

Manual Press Machine

A manual press machine is a machine operated manually by the operator.

The operator applies pressure to the machine through the handle.

After the handle is rotated, the ram moves up and down.

The machine generates force through the lever to drive the punch to make a linear motion.

The hydraulic cylinder generates high pressure and slowly drives all components

of the punch and die process of the workpiece.

The manual press machine is suitable for small batches and simple production.

It can be used for bending, blanking, and punching.

The structure of the whole machine is very simple, including C-frame, punch, die, handle and guide rail.

The larger the opening of the C-shaped frame, the better the feeding of metal plates.

It has an independent hydraulic system, which has the features of small volume, and low operating cost.

The manual press machine is very slow and suitable for one-time and light operation.

Hydraulic Press Machine

The hydraulic press machine drives the ram through a series of components of the hydraulic system.

The oil cylinder of the hydraulic press machine is generally installed on the top beam.

The circuit flow and oil quantity of the hydraulic system determine the speed of the ram.

Just install different punches and dies, and the machine can work.

To protect the safety of the operator, the hydraulic press machine is equipped with sensing devices and safety switches.

The hydraulic press machine has a larger capacity, longer stroke, and adjustable tonnage.

Thanks to the hydraulic system, the speed, and stroke of the hydraulic press are very stable.

This is beneficial to the process monitoring system and the sensing system.

Therefore, the hydraulic press machine is also more suitable for manufacturing complex workpieces.

The hydraulic press machine is suitable for forming, forging, punching, and other sheet metal processes.

The disadvantage of the hydraulic press machine is that it will leak oil, smell, make noise and generate a lot of heat.

At the same time, the use cost and maintenance cost of the hydraulic press machine is relatively high.

Mechanical Press Machine

Mechanical press machines include various machines, which use mechanical energy to process sheet metal.

The power source of the mechanical press machine is the motor, which transfers the energy to the ram.

The speed of a mechanical press machine is faster than that of a hydraulic press machine.

The mechanical press machine is very suitable for stamping.

It is characterized by rapid and repeated application of pressure within a limited stroke.

The stroke of the mechanical press machine is unstable because the force is applied at different speeds.

So the mechanical press machine is not suitable for manufacturing complex workpieces

At present, the press capacity of the mechanical press machine can reach 12000 tons.

The mechanical press machine can provide fast and repeatable operations and reduce the cost of mass production.

Pneumatic Press Machine

The power source of the pneumatic press machine is compressed gas.

The gas in the pneumatic press machine is compressed and expanded to increase the pressure in the cylinder.

The pressure of the pneumatic press machine in the whole stroke is consistent, and there is no need to adjust the pressure.

The pneumatic press machine moves faster and can quickly carry out multiple cycles.

The aperture of the cylinder and the regulated working pressure determine the maximum force of the pneumatic press machine.

The pneumatic press machine must maintain the operating pressure during use.

Otherwise, the stroke of the press will be intermittent, which is not conducive to process monitoring.

At the same time, pneumatic check valves and shaft locking devices are also required to prevent air supply failure.

This will ensures stroke accuracy and operator safety.

The pneumatic press machine is suitable for cutting, bending, punching, and extrusion.

Punching Press Machine

The working principle of the punching press is very simple.

The punching press is used for punching the workpiece in the sheet metal technician.

It can be used to cut the hole and form the sheet metal.

The forming technology of the punching press includes blanking, punching, perforating, and bending.

Punching machines have punches and die of different sizes and shapes.

During processing, the plate is placed under the punch, and the pressure of the machine causes the punch to move downward.

The punching press machine has C-frame and H-frame.

The C-frame drives the ram through the hydraulic cylinder to drive the punch for operation.

H-frame is to place the metal plate in the center of the machine without protruding.

The C-shaped frame occupies less space and is flexible to use; H-frame is suitable for large-scale manufacturing.

Stamping Press Machine

The stamping press machine performs metal forming by applying pressure to a metal sheet.

The punch and the work table of the press are a kind of interlocking device, which can fix the plate between the devices.

In this way, the stamping press machine can cut or punch the metal plate into the final profile.

The size of the stamping press machine is very large, and the operation is complex, so it needs very large power to provide the driving force.

The surface of the workpiece produced by the stamping press machine is defective and the punching hole is not clean enough.

The stamping machine only forms the metal sheet, but the details are not handled well.

Precautions When Selecting A Press Machine

The press machine is widely used in the sheet metal processing industry and has powerful functions.

The press machine can be used for cutting, bending, stamping, forming, and other metal processing.

It is necessary to understand the function and use of the press machines before making a choice.

Selecting an inappropriate press machine leads to a waste of resources and low machine efficiency.

What Is A Panel Bender?

In the past, manual bending machines were used for metal bending.

With the continuous progress of technology, sheet metal forming has entered the era of automation.

Sheet metal bending can be divided into manual bending, semi-automatic bending, and full-automatic bending centers.

Automatic tool changing systems, measuring systems, etc. improve the efficiency of metal bending.

Then came the panel bender, whose function is similar to that of the traditional press brake.

The blade of the panel bender can form a flange in the horizontal direction, and the blank holder in the other direction can keep the material stable.

Standard bending blades can produce many types of radii.

The bending of the panel bender will not leave marks.

Compared with the bending workpiece of the press brake, it will be more aesthetic and clean.

Compared with the previous press brake, the panel bender has the advantages of labor-saving and high speed.

Panel bender can realize the fully automatic bending process.

Automatic loading and unloading of the tools, automatic feeding, measuring, bending, and outputting.

Its bending stroke is short, the feeding speed is fast, and the accuracy of the workpiece is high.

Special tools can also be used for complex bendings, such as crimping, offset bending, etc.

But not every workpiece is suitable for panel bender.

Generally speaking, the panel bender is more suitable for producing box-type workpieces.

The panel bender can bend the side of the whole box at one time.

Now, the panel bender or press brake connected to the robot can be fully automated.

Of course, the function of the panel bender is not as complete as that of the robot bending center.

These two machines have similar usage, but there are some key differences between them.

Understanding the difference between the panel bender and the traditional press brake will help you to choose the right machine.

How Does A Panel Bender Work?

The working principle of the panel bender is different from that of the листогибочный пресс.

When operating the panel bender, the operator only needs to load the sheet metal.

The workpiece positioning, bending, and reversing are controlled by the machine and software.

The panel bender does not press the metal plate into the lower die through punches.

The panel bender is to fix the plate through a pair of blades and bend it up and down to form the final profile.

When bending a complex angle, the blade oscillates around a single bending point until the desired angle is reached.

It does not move up and down along a straight line, which is different from the press brake.

After positioning the plate, the panel bender can quickly adjust to the correct tool length.

When bending, after the workpiece is positioned, the clamping beam tool clamps the workpiece in place.

The lower tool moves upward to bend in a positive direction; The top tool moves down to bend in the negative direction.

The upper pressing tool and the bottom pressing tool clamp the sheet metal in place.

But they will not directly bend the metal, but the upper and lower blades apply pressure to form it.

The metal plate of the panel bender is placed under the clamping claw, and then the clamping claw descends and clamps the workpiece.

The longer the plate protrudes from the other side, the higher the flange produced by the throat of the machine.

The panel bender is very fast and accurate. After the workpiece is positioned, the bending tools move up and down to form a flange.

In the process of side bending, the clamping claw rotates the workpiece, and the tools move up and down to bend the plate.

The movement of the tools determines the bending angle and radius of the workpiece, so even curling can be formed.

The bending blade forms more than 90 degrees of material, and the tool drops to form the final curling.

Box type, flat workpieces, and large workpieces are also suitable for panel benders.

What Are the Features of the Panel Bender?

Преимущества

The panel bender has an automatic tool changer, which reduces the installation time.

The bending of all workpieces can be completed through a complete set of tools.

The interactive area of the tools of the panel bender on the surface of the metal plate is very small.

There are few scratches on the surface of the workpiece produced in this way.

The tool wear of the panel bender is also very small because the friction between the tool and the metal surface is small.

The whole process of the panel bender can be carried out automatically, which saves human resources.

The bending angle change of the panel bender is formed by the movement of the upper and lower blades.

So its tools are not as complicated as press brakes.

The panel bender has an automatic tool changer, which can quickly change tools to adjust the bending angle.

Some large workpieces with positive and negative flanges are suitable for manufacturing with panel benders.

If the panel bender can automatically set the blank holder, only one operator can handle it.

The panel bender only applies pressure to the metal plate through the upper and lower blades.

This bending method makes the change and springback of the metal plate in the bending process less obvious.

So it can bend the whole side of the box at one time.

The bending method of the panel bender is very suitable for the production of boxes, covers, and similar items.

There are some safety problems when using a press brake to make small parts.

While the panel bender can produce smaller profiles by clamping claws or manually manipulating.

Disadvantages

The panel bender also has some disadvantages.

The panel bender is more expensive, so it is less popular than the press brake.

The panel bender cannot handle thicker plates like the press brake.

Due to the limited throat depth and opening height of the panel bender, it is more suitable for the production of smaller flanges.

The position of the clamping tool and bending blade of the panel bender makes it difficult to produce internal bending on the machine.

The Application of the Panel Bender

Panel bender is very suitable for producing square, large and straight objects.

These workpieces have high requirements for appearance and shape.

The surface of the workpiece made by the panel bender has few scratches.

Such as refrigerators, air conditioners, and other electrical appliances, as well as doors, elevators, metal furniture and so on.

When selecting a panel bender, it is very important to know which workpieces its bending method is suitable for.

What Is Metal Manufacturing?

Metal manufacturing makes metal into parts through a series of machines and tools.

Metal manufacturing processes include cutting, bending, and welding.

After the parts are designed, the metal is processed by different machines.

These machines include the laser cutting machine, CNC press brake, turret press, and welding machine.

These machines are suitable for small batch parts manufacturing.

In the manufacturing industry, metal forming methods mainly include the following:

  1. Stamping
  2. Roll forming
  3. Press braking

This article will introduce the differences, advantages, and disadvantages of these metal forming processes.

It will also introduce the factors that need to be considered when selecting metal forming methods.

The metal manufacturing process we choose will be different according to the different products we need.

The following is a detailed introduction to different metal manufacturing methods.

What Is Roll Forming?

Roll forming is a metal forming process in which metal sheets or rolls are bent into longitudinal and uniform profiles.

This process needs to be completed with the cooperation of professional tools.

The raw material of roll forming is the metal flat plate or metal roll.

The roll forming process does not need high-temperature equipment to heat the metal, because it is a cold forming process.

The material characteristics of the metal plate determine the bending radius, and roll forming can complete 180-degree bending.

Roll forming can provide strict tolerances for complex profiles.

Welding, laser cutting, and other secondary processing can be integrated into a production line.

The roll forming machine includes:

Single task roll forming machine. The profile is connected with the spindle, and the roller gradually bends each specific section.

Standard roll forming machine. Easy to operate, the operator can easily remove the spindle.

In addition to these two types, there are parallel machines that can be equipped with a variety of rolling tools.

Advantages of Roll Forming

Rolling forming technology can complete mass manufacturing and complex parts manufacturing.

Roll forming is a gradual bending process, and can produce strict tolerances.

The profiles produced in this way will be very standard and accurate even if they are very complex.

Roll forming is suitable for mass production because the whole machine will not limit the length of the material.

Just coil the metal plates and send them to the machine, the strength of the material can be improved after spring back.

Roll forming machines can produce complex cross sections and bends.

Roll forming produces strict and repeatable tolerances.

The size of the produced parts is very accurate, and the surface is uniform and glossy.

There is no limit to the length of parts formed by roll forming.

The maintenance cost of rolling machine tools is not high.

Roll forming can also handle high-strength metals without breaking.

Roll forming produces less waste and can use fewer materials to produce stronger parts.

Disadvantages of Roll Forming

Roll forming is more suitable for the mass production of complex parts.

The cost of small batch production is high if roll forming is used.

The toolings of roll forming are complex and expensive, so the change of toolings will be high.

Roll forming may cause the port of the part to expand outward.

What Is Metal Stamping?

Metal stamping refers to the forming process of the metal by a large tonnage stamping machine.

The processes involved include stamping, bending, punching, flanging, and pressing.

Custom tools and machines make the workpiece into the desired shape to the pattern.

Stamping is suitable for the mass production of parts.

Stamping simple parts only need one stroke, while multiple strokes are required for complex parts.

Advantages of Stamping

Stamping operation steps are simple and easy to use, and the cost is appropriate.

The stamping process is fast and the requirements for operators are not high.

Disadvantages of Stamping

If the workpiece produced by the stamping machine is long, it will leave tool scratches.

After stamping, the workpiece will produce some damage.

Stamping only deforms the metal through the tools.

When a workpiece needs different lengths, it needs different stamping dies.

In this way, the production cost will increase, so stamping is only suitable for small batch production.

What Is Press Braking?

Pressure braking completes metal forming by bending the metal sheet with upper and lower dies.

The process of pressure braking is the process of repeatedly driving the mold bending through the driving system.

The upper die of press braking has different angles, and the lower die is generally V-shaped and U-shaped.

There are many factors that affect bending, such as tensile strength of materials, precision, and strength of toolings, tonnage, bending radius, stroke, back gauge distance, speed, etc.

These factors will affect the spring back of the sheet metal and the accuracy of the final profile.

Advantages of Press Braking

The efficiency of press braking is very high, but generally, it can only deal with small and short workpieces.

The operation and setting of the press brake are more convenient.

It only needs to replace the top dies or lower dies for different bending shapes and angles.

Compared with roll forming and stamping, press braking has lower costs and higher efficiency.

Disadvantages of Press Braking

The tolerance of press braking is not as strict as that of roll forming, so the accuracy of the final profile is not high enough.

The appearance and accuracy of the profile depend more on the accuracy and manufacturing method of the material used.

Press braking is suitable for small workpiece manufacturing in small batches.

The length of the press brake is limited, and the press brake cannot bend the metal beyond the body.

In addition, press braking is a process of repeated adjustment, which involves more steps than roll forming.

Press braking is only the first step in manufacturing parts, and cannot manufacture products with complex functions.

The operation process of press braking will also have higher requirements for operators.

The operation process involves different bending methods, such as air bending, bottom bending, and coining.

How to Choose the Appropriate Manufacturing Method?

When choosing different manufacturing methods, the following factors can be considered:

Size of Workpieces

Workpieces of different sizes and volumes require different manufacturing costs.

The manufacturing cost of small workpieces is lower than that of large workpieces.

In the manufacturing process of workpieces, different manufacturing technologies can be used.

Shearing machines and laser cutting machines can be used to cut sheet metals.

Then you can process it with a stamping machine or bend it with a press brake.

Material Types

Different manufacturing processes are suitable for different materials.

The ductility and tensile strength of materials are different.

Press braking and roll forming are suitable for materials with low strength.

Because of the poor ductility of high-strength materials, it is difficult to bend and roll forming.

Unsuitable materials will produce a large amount of waste and damage the toolings.

Workpiece Design

Some workpiece designs are more suitable for stamping, such as holes, embossing, etc.

The cutting edge of laser cutting will be smoother, while the edge of stamping will have many cracks.

The shape and complexity of the workpiece also affect the choice of the metal forming method.

Roll forming can form complex linear shapes only once while bending requires many times.

Cost

In fact, all the choices are to reduce costs with the same quality.

The labor input cost of stamping automation is lower than that of manual bending.

There is little difference in tooling cost between roll forming and press braking.

Roll forming can save costs for the mass production of large workpieces.

Small workpieces and small batch manufacturing are more suitable for press braking.

The press brake is widely used in the household industry, construction, machinery, automobile, aviation, and other fields.

The press brake bends the sheet metal through the upper and lower dies at the ram.

Different punches and dies can produce profiles with different angles and shapes.

The material and opening of the die should be selected according to the workpiece and bending method.

There are oil cylinders on the left and right uprights respectively, which can drive the movement of the ram.

The stroke of the ram is controlled by the hydraulic and electrical systems.

The oil cylinders, and hydraulic and electrical control system ensure the accuracy of repeated bending.

The body of the press brake is composed of two vertical plates of steel structure.

There is also a workbench at the bottom of the press brake.

In order to prevent the workbench and ram from deformation due to long-term overload.

The hydraulic press brake is equipped with a crowning device, which can compensate for the deflection of the workbench and ram.

Installation of Press Brake

As the press brake is a large machine, it needs a crane to lift the press brake for unloading and transportation.

The rope of the crane should be strong enough and long enough to ensure the safe lifting of the press brake.

Fix the chain on the front lifting hole of the machine.

Use a crane with a safety device to lift the press brake.

It is loaded on the truck and then transported to the installation site for installation.

Machine Leveling

In order to ensure the bending accuracy of the press brake, the press brake needs to be leveled regularly.

Place the press brake on the horizontal ground, and place the spirit level on A1 and A2 to test its levelness respectively.

Faults of 1-2 mm per meter are allowed. If the difference is too large, the leveling bolts at the bottom of the press brake need to be adjusted.

The Connections of Electric

Let professionals check the electrical wiring of the press brake and connect the power supply.

The electrical connection of the three-phase system should be in the correct position.

When the press brake is connected to the three-phase power supply, the direction of the pump rotation drive motor must be correct.

If the motor turns incorrectly, the phase of the inlet circuit needs to be changed, but the internal circuit cannot be changed.

Restart the oil pump motor and check the steering.

Before checking the rotation direction of the motor, make sure that the press brake has been cleaned and leveled.

Гидравлическая система

In the hydraulic drive system of the press brake, the AC servo motor drives the ram to move.

The AC servo motor also drives the hydraulic oil to align with the variable speed pump.

The driving device is installed on the beam and connected with the machine body through the guide rail.

The press brake control system controls the position of the beam and moves the beam up and down through the drive motor.

There are grating rulers on both sides of the press brake, which can read the signal and feedback to the control system.

The control circuit, filling valve, and servo valve in the oil cylinder are independent and controlled by the DNC controller.

The Hydraulic system or electro-hydraulic servo system can improve bending accuracy and reduce energy consumption and cost.

The hydraulic system is so important, so what is involved in the use and maintenance of the oil cylinder?

First of all, to maintain the cleanliness of the hydraulic system, the cleanliness of the oil tank and hydraulic oil is a cardinal task.

Every time you change the hydraulic oil, wipe the inside of the oil tank with a soft towel and clean the oil tank with clean gasoline.

Open the valve storing the dirty oil, drain the dirty oil, and wipe off the stains on the surface of the oil tank.

The oil temperature of the hydraulic oil of the press brake should not be used at too low or too high a temperature.

If the temperature is below zero or above 70 degrees, an oil heater or cooler can be installed.

Hydraulic oil should be filled through the air filter.

After filling, also operate the machine to discharge the bubbles in the hydraulic circuit.

Back Gauge of Press Brake

The back gauge of the press brake is used for the positioning of the workpiece.

Place the workpiece on the lower die and push it into the machine, and the stopper finger of the back gauge will dock with the workpiece.

The axes of the back gauge can move in different directions through the control of the control system.

The X-axis can move forward and backward, the R-axis can move up and down, and the Z-axis can move left and right.

Each axis of the back gauge is driven by an independent motor.

The Z-axis and R-axis can also be adjusted manually, but only from the back of the machine.

The linear guide rail and ball screw make the axes of the back gauge move freely.

The back gauge moves in the X-axis direction, and the force is limited to 150N to prevent the collision.

Operating the Press Brake

Precautions before operating the press brake:

Check whether the switch, control, motor, and grounding are in a normal state.

Check the oil level of the oil tank and the condition of the hydraulic system.

Idle the machine and maximize the stroke of the press brake.

Check whether the machine is in normal operation.

Whether the rotation of the motor is normal and whether the sound is abnormal.

Tooling assembly and alignment

Before installing the punch and die, the machine should be in a stopped state before installing the lower dies and the upper dies.

The upper and lower dies of the press brake need to be aligned to obtain higher bending accuracy.

By driving the ram downward, the upper dies are close to the lower dies, leaving a distance of workpiece thickness.

Manually adjust the position of the upper and lower dies through the bolts of the lower dies and the clamps of the upper dies.

After the upper and lower dies are aligned, the ram will be driven upward.

Tool splicing and replacement

Select manual mode, lower the ram, and turn off the press brake.

To change the tool, you need to stop the machine and remove the toolings from the side.

Then put a new die from the side and tighten the bolts or clamps

Now there are many quick clamps for quick replacement of toolings, which are convenient and fast.

There is no need to loosen the bolts, and the toolings can be loaded and unloaded vertically.

Shut down the machine

When turning off the press brake, you need to switch to manual mode

Lower the ram by stepping on the pedal to align the upper die with the lower die.

Press the stop button and turn off the main motor. The switch parameter is set to 0.

In case of emergencies, you can also press the emergency stop button.

But this will not affect the subsequent procedure, because only the axes and pump are turned off.

Release the button to restart.

Maintenance of Press Brake

The press brake should be regularly maintained and troubleshot by professionals.

Including lubrication and cleaning of machine parts, use of high-quality lubricating oil, weekly lubrication of worn parts,

For the cleaning and oil level inspection of the hydraulic system, the hydraulic oil needs to be replaced regularly.

Check whether the wiring of the electrical cabinet is in good condition.

Check the signal of the sensor, such as the grating ruler, and also check the tightness of the bolt.

What Is A Press Brake?

Press brake is a machine used for metal bending and forming.

Press brakes drive the punches and die through different driven sources.

Thus, the dies can bend the sheet metal repeatedly many times to form profiles.

Materials of different thicknesses and lengths require different bending forces.

Bending force is the tonnage exerted by the press brake.

Press brakes produce tonnage in different ways.

The hydraulic press brake is suitable for bending with large tonnage.

Driven sources are generally divided into mechanical, hydraulic, electric, and pneumatic types.

The name of press brake is named after the driving method.

The pneumatic bending machine drives the slide block through air pressure.

The servo-electric bending machine drives the slider to move through the servo motor.

Servo electric bending machine has very high precision and speed.

How does A Press Brake Work?

Modern press brakes can be mainly divided into mechanical, and hydraulic press brakes.

At present, the press brake has developed into the advanced CNC hydraulic press brake.

It can handle all kinds of complex and mass workpiece-forming tasks.

The mechanical press brake drives the flywheel through the motor.

The staff operates the clutch drive fly control flywheel.

Thus, the crank drives the movement of other parts.

The operation of the mechanical press brake is relatively simple.

The mechanical press brake can handle large tonnage bending.

The hydraulic press brake is driven by the synchronous movement of the hydraulic cylinder.

There is a hydraulic cylinder on each side of the uprights.

The hydraulic cylinder is connected with the ram through the piston rod.

The movement of the hydraulic cylinder drives the ram up and down.

The movement modes of the hydraulic press brake are divided into up-moving and down-moving.

The back gauges accurately position the workpiece through the movement of different axes.

The hydraulic press brake has the advantages of high speed and high precision.

The disadvantage is that the tonnage of bending is limited.

The CNC press brake is a hydraulic press brake equipped with a CNC control system.

The CNC control system controls the movement of each part.

CNC control system has modular programming function and high precision.

The operator can set parameters through the control system.

For example, bending angle, plate thickness, flange length, cycle time, stress, etc.

The CNC press brake is also equipped with an automatic feeding system.

The movement of the ram and the back gauge accurately controls the position of the workpiece.

Synchronous movement of the motor drive axes of the back gauge and the ball screws.

The back gauge can accurately measure the length of the flange being formed.

Adjust the bending angle by adjusting the ram movement through the control system.

There are basically three bending methods: air bending, bottom bending, and embossing bending.

The choice of bending method has a great relationship with the thickness of the plate.

Air bending is the most common bending method.

During air bending, the workpiece is not in full contact with the bottom die.

Air bending can be carried out with a relatively small tonnage.

The method of bottom bending and coining can also be used as needed.

During bending, the hydraulic cylinders drive the movement of the ram.

The ram drives the upper die to exert pressure on the lower die on the workbench.

The sheet metal in the middle forms a specific angle through the extrusion of the die.

After repeated bending many times, the final profile is obtained.

The shape of the punches and dies and the movement of the ram determine the angle and shape of the metal plate.

CNC press brake has flexible numerical control and programming functions, which is very friendly to operators.

How to set up a press brake?

First of all, understand the drawing of the bending workpiece, which is a very critical step.

Determine the material, length, and thickness of the workpiece.

Bending angle, bending radius, flange dimension, and tolerance of the workpiece.

Secondly, choose the appropriate bending method and die.

According to the relationship between bending radius and metal thickness, select the appropriate bending method.

For example, air bending, bottom bending, and coining.

Select the punches and dies that match the material of the bending workpiece.

Thirdly, determine the tonnage according to the tonnage table.

You can consult the corresponding tonnage estimation of the manufacturer.

If it is air bending, you can refer to the tonnage chart to determine the tonnage.

The tonnage of bottom bending is four to six times that of air bending.

The tonnage of coining is eight to ten times that of air bending tonnage.

Fourth, install and adjust the toolings.

Check whether the thickness of the toolings and the proportion of the upper and lower dies are normal.

Adjust the stroke of the ram, otherwise, the toolings cannot be used normally.

Adjust the upper limit point of the toolings to reserve the stay position of the ram.

Measure the distance between the upper and lower dies and set an appropriate gap.

The tightness of the die can be adjusted according to the bending angle.

When bending, adjust it with a pressure gauge to avoid damage to the toolings.

Fifth, perform the program procedure of the press brake.

This requires the operator to be familiar with the functions of the CNC controller.

There are many functions of programming, which can improve work efficiency after familiarity.

It can also be programmed offline and used directly by technicians after programming.

At this stage, the workpiece cannot be bent directly.

If a bending test is required, scrap plates can be used.

The production can be carried out after the bending test has no problems.

If there is a problem with the bent workpiece, you can check the program.

After checking and correcting the program, you can operate the press brake.

These steps can save costs and improve efficiency.

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