Absolute Positioning and Movement of Cooperating Robots
Today’s industrial robots have a very good repeatability and enable automated manufacturing for many products. However, they are not able to position with absolute accuracy or even move along a track absolutely. This lack of ability to perform absolute movements today represents a large deficit, which lead to the development of highly complex multi-sensor systems in the industry. It also prevents an effective off-line programming so far and raises the complexity of robot systems and reduces the economical value.
The challenge to ensure a high level of competitiveness with smaller batch sizes and frequent product changes can be solved by using absolutely precise robots and the possibilities to use off-line programming systems without lengthy set-up times, the removal of fixtures by absolutely controlled cooperating robots and the integration of additional inspection processes.
The use of large-scale metrology to build a control of positioning and self-calibration to follow tracks for robots is at the heart of the deficits of robots: their poor ability to perform absolute movements. This approach may omit additional indirect sensors and the complexity of robotic systems is substantially lower than the solutions existent in the industry today.
The movement of the robot in an absolute and especially identical coordinate system allows the development of cooperating robot systems. These systems allow the handling of large or flexible components, the renunciation of devices needed to hold work pieces or the use of robot-guided sensors in an economically feasible manner.
- Large-Scale Metrology setup
- Optimization of absolute accuracy and track following by means of control loops and self calibration