How to properly calibrate a bending machine? The so-called bending machine is a machine that can bend thin sheets. Its structure mainly includes a frame, a workbench, and a clamping plate. The workbench is placed on the frame and consists of a base and a pressure plate. The base is connected to the clamping plate through hinges, and the base is composed of a seat shell, a coil, and a cover plate. The coil is placed in a recess of the seat shell, and the top of the recess is covered with the cover plate. When in use, the coil is energized by wires, generating a force on the pressure plate, thereby clamping the thin sheet between the pressure plate and the base. The use of electromagnetic clamping allows the pressure plate to be made to meet various workpiece requirements and can process workpieces with side walls, making operation very simple. However, the accuracy of the bending machines produced by each manufacturer varies.
In the past, operating a laser calibration instrument required a professional metrologist. It is necessary to open the cover of the bending machine saw, which allows for adjustment of optical components on the workbench, spindle, and independent tripod. The spatial calibration process may take several days, depending on the size of the saw. Therefore, when the workpiece measured by the CMM is within the tolerance range, spatial calibration may not be necessary.
The trajectory of the moving target is not a straight line, with significant lateral movement. Traditional interferometers cannot perform these measurements because they do not allow for such large lateral movements. However, a single-aperture laser interferometer, like a laser Doppler displacement meter, is not affected by large lateral movements. Using a flat mirror as the target, movements parallel to the mirror do not shift the laser beam and do not adjust the distance from the light source.
When the need for tight quality control arises, calibration and compensation can directly affect lead times. A saw within the specified accuracy range can work quickly while maintaining polishing precision. Calibration allows for in-process inspection of workpieces, saving time that would otherwise be spent moving workpieces between the saw and the CMM. Additionally, regular calibration can be used to predict whether the saw has deviated from the accuracy specifications.
When using a CNC bending machine with in-process inspection, using an appropriate probe instead of a knife can measure the proportions of the workpiece. The spatial positioning errors can be compiled into an error table or compensation table so that the software can correct the coordinates of the measured probe.
