01.12.2021

What is the difference between hydraulic bending machine and CNC bending machine?
Casting technology has a long history in our country. The overall cost of the workpiece is very low, mainly by smelting the metal into a liquid, and then pouring the liquid into a specific forming mold. After the liquid metal is cooled, a shaped casting is formed. The casting technology is to burn some steel material in a charcoal fire, and then quickly pull the red steel out and put it into an air hydraulic hammer for forging.


Bending machine blade mould

The reason why CNC bending machine molds choose forging instead of casting is because casting generally requires steel mills to produce rolled blanks, and steel mills are willing to produce when there are many standard parts, but standard parts for CNC bending machine molds Generally not many, it is not very cost-effective to use castings in general.


Numerical control bending machine molds also have high requirements for strength. Castings are prone to bubble formation during the production process, which makes the strength not as good as forgings. Forgings are forged by air hammers, and the interior will be more rigid, so the strength will Larger, so CNC bending machine molds generally choose forging rather than casting.

The CNC bending machine is an ordinary hydraulic bending machine with a CNC operating system. It is an upgraded product of the ordinary bending machine. Frequent process conversion can reduce the labor intensity of the operator. However, the operating skill of the operator is higher than that of the ordinary hydraulic press brake.


Compared with the hydraulic bending machine, the CNC bending machine is characterized by its CNC operating system. This is an upgrade to the ordinary bending machine, which reduces the labor of the operator and enhances the processing efficiency. But at the same time, the operating requirements and skills of CNC bending machines are much higher than those of hydraulic bending machines, and they are relatively complex. The CNC bending machine has a multi-step programming function, which can realize multiple automatic operations and complete the one-time processing of multi-step parts.


In the hydraulic bending machine, the coil is energized by the wire, and the gravitational force is generated on the pressure plate after the energization, so as to realize the clamping of the thin plate between the pressure plate and the base. Due to the electromagnetic clamping, the pressing plate can be made into a variety of workpiece requirements, and the workpiece with side walls can be processed.


The hydraulic bending machine includes a support, a workbench and a clamping plate. The workbench is placed on the support. The workbench is composed of a base and a pressure plate. The base is connected to the clamping plate through a hinge. The base is composed of a housing, a coil and a cover. The coil is placed in the recess of the seat shell, and the top of the recess is covered with a cover plate. When in use, the wire is energized to the coil, and the gravitational force is generated on the pressing plate after being energized, so as to realize the clamping of the thin plate between the pressing plate and the base. Due to the electromagnetic clamping, the pressing plate can be made into a variety of workpiece requirements, and the workpiece with side walls can be processed.

CNC bending machine and CNC folding machine
CNC bending machine and CNC folding machine in sheet metal forming, from the following six aspects of the characteristics of the comparison:

(1) different forming principles

Bending machine -- bending Angle is controlled by controlling the amount of upper and lower pressure. When bending, the short side is included. Operators need to lift most of the materials on the outside. Edge folding machine - after the plate is placed flat on the work table, the edge holder is pressed down to fix the plate, and the edge holder is flipped up and down to achieve the edge folding. In all the edge folding processes of an edge, manual positioning and auxiliary turning and positioning work are no longer needed.

(2)The bending accuracy is different

Bending machine -- the dimensional accuracy of the control is the short side dimensional accuracy of the positioning of the rear stop. After the completion of bending, the final error accumulates to the inner space size. At the same time, because the bending Angle is controlled by the pressing amount of the upper die, the Angle is related to the thickness of the material. Folding machine -- the size precision of the control is after the first folding is finished, the first edge is taken as the positioning benchmark, and the final control size is exactly the inner space size required by the customer. At the same time, the bending Angle is directly controlled by the flanging Angle, which has nothing to do with the thickness of the material.

(3) material surface damage problem

Bending machine - when working, the material will generate relative movement in the lower die, leaving indentation without surface protection.When bending large workpiece, need to turn over and move many times, the process will inevitably produce scratches. Crimping machine - when working, the crimping beam cutter and the crimping beam cutter do not move relative to the material, thus completely avoiding surface damage.Large workpiece in bending, because the plate is flat processing, at the same time a positioning can be completed on one side of the workpiece all processing, completely avoid surface damage.

⑷The skill level of workers is different

Bending machine - bending workers of a relatively higher level of technical requirements. Folding machine -- programming can be realized intuitively by drawing with fingers or offline programming can be realized by engineers using software and importing processing program with USB or network connection. After programming, the main work of workers becomes simple loading and unloading work without skilled bending workers.

⑸Cutting tools configuration

Bending machine - different thickness, shape of the product, need different up and down mold, in the realization of some special bending (such as arc) requirements, need to change the tool or transfer to another machine tool to achieve, increase the transfer of semi-finished products and temporary storage work. Folding machine - through the configuration of rotatable beading beam, while installing two sets of beading beam tools, to achieve the simi complete all bending procedures, for arc bending or other special bending requirements, basic need not change the tool, just in the program to make changes can be completely achieved.

⑹The knives' service life

Bending machine - because of the relative movement of the workpiece in the die, the tool will wear, maintenance or replacement. Flanging machine - basically avoids the relative motion between the material and the cutting tool.

⑺Drive system

Bending machine - hydraulic drive, bring more maintenance work and easy to be affected by environmental factors. Flanging machine -- adopts all-electric drive design, reduces the maintenance workload and is independent of the use environment, so as to achieve higher bending accuracy

⑻Disadvantages of the hemming machine

1) due to different bending principles, R Angle of the edge bender is larger than that of the bending machine;

2) limited by the supporting table, the workpiece that flips down on both sides cannot be processed;

3) the workpiece size is limited by the pressing area of the upper mold, and the workpiece smaller than the size of the pressing area cannot be processed;

4) the efficiency is not as high as the bending machine;

5) due to the structural characteristics and mold diversity of the bending machine, some complex shapes can be simple to achieve through the bending machine, relatively speaking, the 　　flexibility of the folding machine is poor;

6) folding machine is widely used in Europe and the United States, we are affected by the traditional Japanese processing concept, the general use of bending processing, no better use of folding machine.

How does the sheet metal bending machine grasp the bending size and how to adjust the mold?
We all know that the material that we want to bend on the sheet metal bending machine is in compliance with the standard, and we need to have a certain control over the size of the bending, so do you know how to grasp the size of the bending? The main thing is to bend. The following article will give you a detailed introduction. In addition to the bending angle, the mold is also very important. As long as there is no problem with the use of the mold, the bending angle will be no problem. Do you know how the mold should be adjusted? Mainly about the adjustment of the machine, the adjustment of the slider stroke, and the stroke Module adjustment, gap adjustment and angle adjustment, the following is a detailed introduction, let’s take a look.

How to grasp the bending size of sheet metal bending machine:
If you want to ensure that the bending size of the sheet metal bending machine is in compliance with the standard, you need to control the bending angle. Then the following is an introduction to the grasping method of the specific bending size:
1. Avoid using sheet metal bending machine to bend the edge alignment, avoid large angle alignment.
2. Preliminary inspection is carried out before formal processing, and cyclic inspection is carried out during processing.
3. In order to avoid accumulative errors, the unfolded size must be measured each time it is processed.
4. Choose a good processing method and a good technical preparation method to simplify the processing difficulty.
5. The bending machine selects the appropriate machine according to the accuracy requirements of the processed product.
6. Do not choose different tools, make sure that the tip of the upper die is on the same straight line before processing.
7. For products whose edges must be bent by a bending machine, the front bending angle must be less than 90 degrees.
8. Determine the accuracy of the measuring instrument before processing.

Installation and adjustment of the mold for sheet metal bending machine:
When installing the sheet metal bending machine mold, be sure to check the status of the equipment, and then install and debug according to the steps. Pay attention to personal safety when debugging. The following is the detailed adjustment content:
1. Adjustment of the machine
When installing the sheet metal bending machine mold, you must first understand the performance of the machine, turn on the metal bending machine, adjust and check patiently, and see if the machine has previously used dust and iron chips. Prevent unnecessary trouble for later use.
2, adjustment of slider stroke
First check whether the ratio between the thickness of the metal sheet bending machine mold and the upper and lower modules is normal. The general slider needs to be controlled at the switch point of the stroke line. This must be noted, otherwise the mold will not be used normally, but some people still Such mistakes are often made.
3, stroke module adjustment
After adjusting the slider stroke standard, the next step is to adjust the upper limit point of the module. Generally speaking, the module is up to the highest point, and the module and switch must be set. In this way, the staying position of the module can be flowed out, and through some of the above operations, the production efficiency can be greatly increased. In this process, the module also needs to be slowed down. Because the module must be decelerated when it is down to the bottom dead center, which protects the machine and the mold.
4. Adjustment of the gap
Then there is the adjustment of the gap between the molds of the sheet metal bending machine. First, measure the gap between the upper module and the lower module. The reasonable gap needs to be determined according to the sheet to be folded.
5. Angle adjustment
Adjusting the bending angle is also the most important link. The selection of the angle is definitely related to the product requirements. Generally speaking, when bending a 90° mold, the angle must be set. The middle angle must be greater than the angle on both sides. Sometimes it may be tight. You can adjust it The screws on the machine are processed. After the adjustment, if the product does not change the demand, do not modify it again. Then, when bending, use the pressure gauge to calculate the accurate pressure number and adjust the pressure. So as not to cause mold chipping.

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