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The
COPRA® LaserCheck 6: 2 sensors for accurate results Fully automatic laser-based bending angle measuring device for press brakes
The COPRA® LaserCheck 6 Manufacturing sheet metal parts with properly bending angles that are kept constant all times often meets a problem during the actual production process: different parameters in material thickness and stresses. In order to solve this problem and to make the uses also of minor quality materials safe for the user data M Engineering has developed a powerful solution for measuring bending angles in press brakes – the COPRA® LaserCheck 6. COPRA® LaserCheck 6 enables the user to determine the exact bending angle for press brakes by a built-in semiconductor laser with line optics and the 1/3” CMOS-camera together with strain gauges – and it works contactlessly. The COPRA® LaserCheck 6 has an integrated positioning drive to keep the working distance constant after changing the die width. It can be directly connected to a free USB 2.0 and a free printer port of control units working with Windows XP.
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Working Principle The bending angle is measured by scanning the projection of the laser beam to the surface of the sheet metal with the CMOS camera. The angle between the laser and the viewing axis of the camera defines the correlation between the position of the line in the camera image and the angle between the sensor and the sheet metal. With a second sensor at the opposite site the bending angle is calculated.
COPRA®
LaserCheck 6:
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Springback
The resulting bending angle is highly influenced by the springback. Measure springback and to define the overbending is made with strain gauges, that are glued to the frame of the press brake.
These strain gauges are connected to a strain gauge amplifier. The output is either analogue (0-10V) or
digital (RS232). For the wide range of bending forces the amplification of the amplifier can be adjusted to four different levels to achive a 17 bit resolution.
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Process The machine bends to an estimated prebend angle. Now the sheet thickness is corrected and the sheet metal is bent to the programmed angle (Point A). In this position a second angle is checked by the COPRA® LaserCheck (alpha1). At this point the stress forces are measured by the forces sensors (F1). After relieving the sheet metal part to a defined remaining force |
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Result The result is a bending angle with a never seen precision just after one bending step regardless if differences in material properties such as thickness or other. And all is done fully automatically.
Highest accuracy at every bend |
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Mounting The COPRA® LaserCheck 6 is mounted on the press brake under an angle of 45° to the die in a working distance of 160-300 mm below the die. It is moveable along the die either manually or automatically. Due to its mounting position the measuring range is 0° to 180°. For each measuring position there are 2 sensors needed. Four sensors enable an independent correction of the cylinders to compensate angle differences in long bends.
Mounted on a press with hydraulic crowning |
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Accuracy The sensor accuracy is better than ±0.1°. The system accuracy is influenced by the control, the machine accuracy, the tools and the material. |
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Surfaces The optical system can measure most of the common surfaces. Limits are grinded surfaces, if the grinding pattern is parallel to the laser beam and highly polished surfaces. The software includes a plausibility test package that enables the LaserCheck to measure also perforated metal plates, plates with crimping, and parts, where only one side is visible.
Strain gauge amplifier
Strain gauge DA 40 |
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Highlights: COPRA® LaserCheck 6
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Technical Data: COPRA® LaserCheck 6 | |||||||||||||||
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data
M Engineering GmbH . Am
Marschallfeld 17 . D-83626 Valley/Oberlaindern, Germany Internet:
http://www.datam.de .
e-mail: datam@datam.de |
Our
efforts were a success - some developments got ready for this
year's BLECHEXPO exhibition in Stuttgart, Germany.
COPRA®
LaserCheck / MetalBender Seminar & Workshop 2007:
