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Composition & Application: Press Brake Back Gauge Detailed Explanation

1. Press Brake Back Gauge Composition


The press brake back gauge is composed of a beam, a screw, a motor, a finger, and a guide rail. The back gauge composition of the bending machine with different principles is also different. Let's introduce them one by one.

1.1 The composition differences between torsion bar and electro-hydraulic proportional valve press brake

Torsion bar press brake back gauge:


Ordinary iron beams, common screw rods, and guide rails for the back gauge of the torsion machine are provided with grooves on the beams to support the sliding of the finger. Ordinary two-point block finger can be adjusted manually.

Electro-hydraulic proportional valve press brake back gauge:


The electro-hydraulic proportional valve press brake adopts ball screws and linear guide rails to increase the movement accuracy of the back gauge. Double linear guide rails are used on the beam. Three-point block finger, adjustable manually, electrically, and automatically.

1.2 The accuracy differences between torsion bar and CNC press brake

The positioning accuracy of the back gauge of the torsion bar press brake is poor. And the repeat positioning accuracy is also poor.

The positioning accuracy of the back gauge of CNC press brake can reach ±0.00078”. While the repeated positioning accuracy can reach ±0.0006”.

In terms of speed, the back gauge speed of the CNC type is twice that of the torsion bar type.

2. What is the use of back gauge axis?


2.1 Axes Number

The press brake back gauge can equip X, R, Z axes, or X1, X2, R1, R2, Z1, Z2.

- The X-axis controls the back gauge to move back and forth

- The R axis controls the back gauge to move up and down

- The Z-axis controls the back gauge to move horizontally on the beam.

- X1, X2, R1, R2, Z1, Z2 means that the two fingers can be moved together or separately, controlled by the computer.

Why do you need an R axis?

If the workpiece is more complicated, the height of the stopper needs to be readjusted after bending to continue positioning. At this time, the R axis is necessary.

Although the R axis can be adjusted manually, the accuracy is not high and the adjustment time is long. If the R axis is equipped with dro digital readout device, the device can read directly, the effect will be better.

Someone who wants to retrofit the manual press brake will equip a digital readout device. However, it is best to be automatically adjusted by computer control, with higher precision and higher efficiency.

Why do you need Z1, Z2 axis?

If the machine is 3000 in length, but needs to bend a 200mm workpiece, you need to move the finger to use calibration block to such a shortboard.

If the Z1 and Z2 axes are controlled by the computer, you can program directly in the computer, and the computer controls the movement of the backgauge finger. This is more efficient and faster.

When do you need a 6-axis ?

The 6-axis backgauge refers to X1, X2, R1, R2, Z1, Z2. The back gauge is separated by 2 modules. The 2 modules can move up, down, left, right, and back, and can move synchronously or independently. When bending the workpiece is asymmetric, the fingers need to be misplaced one after the other to be able to fold out the workpiece. Therefore, the two fingers need to be moved separately to stagger the positions.

The 6-axis back gauge is completely controlled by the computer, with high configuration, fast speed, and high efficiency. It is equipped with DA66T or MODEVA19T CNC system, so that your bending is stress-free.


2.2 CNC press brake backgauge

The movement schedule of the CNC press brake back stop is displayed on the computer. The computer automatically measures and calculates, which greatly improves the worker’s working efficiency.

The programs and drawings can be backed up on the computer or in the flash disk. The CNC machine computer has offline programming software. If you have a large number of workpieces that need to be programmed and drawn, you can run the offline programming software on the office’s computer. You can draw the programming on the offline programming software, and then copy it to the bending machine system to run directly.

2.3 Digital Readout display device

A readout display can be used for the back gauge display of the torsion shaft synchronous brake press. The laser or sensor can be used to measure the movement distance of the back gauge. Workers can see the movement value of the back gauge on the readout display.

The disadvantage is that the accuracy of the readout display is not high, so the bending error is large. It is recommended to buy a CNC press brake.

The most popular press brake in the market

The most popular hydraulic torsion bar and diacro model 16-24 press brake for sale in the market is the Cincinnati press brake. The most popular CNC press brake for sale in the market is Amada, cmf, Trumpf, Bystronic, Shenchong, etc.