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How to Bend a Circular arc by Press Brake

Views:21     Author:Durmapress     Publish Time: 2020-05-18      Origin:Durmapress Inquire

How to Bend a Circular arc by Press Brake

First turn on the power of the press brake, turn on the key switch on the control panel, and then press the oil pump to start, so you can hear the sound of the oil pump rotating. At this time the machine does not move.


1. Stroke adjustment, the use of press brake must pay attention to adjust the stroke, must be tested before bending. When the upper die of the press brake descends to the bottom, there must be a gap of plate thickness. Otherwise it will cause damage to the mold and machine. The adjustment of the stroke also has electric fast adjustment and manual stomach adjustment.


2. Select the notch of the lower die of the press brake. Generally, the notch with a width of 8 times the thickness of the plate should be selected. If bending a 4mm sheet, you need to select the V notch of the lower die of the press brake of about 32mm.


3. The back gauge adjustment generally has electric fast adjustment and manual fine adjustment, the method is the same as the shearing machine.


4. Depress the foot switch to start bending. The press brake is different from the shearing machine. It can be released at any time. When the foot press brake is released, it stops, and continues to descend on the pedal.


Below we demonstrate the bending process:


1. As shown in the red circle, put the place where you want to bend the arc under the press brake.



2. Press the switch and press the press brake.


3. As shown in the red circle, after the press brake presses the iron sheet, the hand only needs to be lifted by a small amount, so that it will not form an excessive angle.


4. At this time, raise the press brake again, send the iron sheet forward, repeat the above three steps, and repeat three or more times according to the size of the arc you want.


5. Here, we repeat three times and fold a semicircular arc.



6. As shown in the figure below, you can fold out a circular arc, and the effect is good.

Each feed algorithm:


The plate thickness is 2mm, the bending angle is 120 degrees, the outer radius is 30mm, the neutral layer radius is 29mm, and the arc bending is calculated by taking the arc length of the neutral layer. Therefore, the number of bending knives and the bending angle of each knife are also calculated according to the arc length of the neutral layer. The distance from the neutral layer to the side is half of the plate thickness.

In the picture above, how many knives are needed for arc bending, and what is the bending angle of each knife?

If we advance 2mm per pass. Number of bending knives = Arc length / 2mm = 30.37 / 2 = 15 Number of bending knives15Bending angle = 180- {(2 / Arc length) X (180-Bending angle)} = 180-{(2 / 30.37 ) X60) = 176Bending angle per knife 176 degrees.


If we cannot measure the arc length during the bending operation, we can also calculate according to the following formula:


Bending angle = 180- {(2 / 3.14X neutral layer radius) X180} = 180- {(2/3. 14X29) X180} = 176 If you want to enter 3mm per knife, replace the 2 in the above formula with 3 Of course the above formula is a theoretical calculation formula. In actual processing, adjust according to the result calculated by the above formula.


The bending of the CNC press brake is much simpler.


There are three most popular types of CNC systems for press brakes on the market: 1. Italy ESA, 2. Switzerland CYBLEC, 3. Netherlands DELEM, these three systems, as long as they are electro-hydraulic proportional CNC types, will have arc bending Programming, with the required hardware, after programming, you can perform bending work







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