Diameter Measurement of Metal Coils in Punching Systems Using Laser Distance Sensor Triangulation
In punching machines in the metal processing industry, continuous material replenishment of sheet rolls, so-called coils, must be guaranteed. To avoid downtimes, it is necessary to detect the end of the material at an early stage to initiate an automatic roll change. For this purpose, the diameter of the shiny metal coils is precisely monitored via laser distance sensor triangulation and communicated to the control system. If the diameter falls below a defined tolerance value, a signal to replace the sheet rolls is automatically sent.

Double Layer Detection for Sheet Metal with Laser Distance Sensor Triangulation in the Automotive Industry
During the automatic removal of flat metal sheets from a supply by a robot, several sheets can stick together due to the magnetic charge. The thickness of the sheets must be detected to ensure that only one sheet per assembly process is gripped. For this purpose, two laser distance sensor triangulation are installed opposite each other after removal. One measures from above to the sheet, the other laser sensor from below. The sheet thickness is thus determined using a differential calculation. If this result is greater than that of an individual sheet, a signal is output.