Seite - 29 - in Proceedings of the OAGM&ARW Joint Workshop - Vision, Automation and Robotics

Fig. 3. Diagram of the ”pick up panel” process as stated in figure 2. panel task is shown in figure 3. Our DSL has three main commands to build each process. A process is used when a process starts. The name of the process is set as an attribute in the syntax. A task describes an automatized operation. The use command is used when the process is supposed to use a specific tool. Parameters can also be used to configure the behavior of the tool. So, the pick up panel process as in figure 3 can with the help of the DSL finally be written as follows. process ”pickup panel” task ”check security ” use ”arm” parametersv ”5.5 ,6.0 ,8.0” use ”vacuum griper” parameters ”hold” use ”arm” parameters ”3.5 ,3.0 ,8.0” use ”vacuum griper” parameters ”drop” use ” laser ” parameters ”0.0 ,0.0 ,0.0 ,1.5 ,1.5 ,1.5 ,1.5 ,0.0” V. TOOL CHAIN A. Manufacturing Execution System TheManufacturingExecutionSystem(MES) is responsible forpreparing theCADdata forproductionandforperforming and tracking the transformation of raw materials into finished goods. As depicted in figure 4 the product is handed over by the CAD system. First, the MES checks, if the delivered data is correct regarding syntactic and semantic concerns such as closed contours or the considerations of the maximum producible dimensions. If these checks fail and an automated manufacturing process cannot be guaranteed, a meaningful reportwillbepresented to theuser, so thathecan take further corrections. After validating the CAD data, the system forwards the data to the CAD reader, which transforms it into an internal representation. Therefore, the beams of timber and panels of timber or gypsum are merged into elements according to their identifiers. Then, the surrounding contour of the elements is calculated. After that the beams of timber can be stored in the database. Since the beams are not part of the automatic manufacturing process, this information is only used for displaying them within the production units plan as well as to calculate the positions where the gypsum and timber panels have to be connected to the beams. The next step is to store the panels and the position (layer) of the steam brake in the database. Finally, all mounting parts for the particular processing steps are determined and written to the CAD file. This parts could be e.g. drillings for power outlets or heating systems. Fig. 4. Scheme of the Manufacturing Execution System. The next unit within the MES is the CAD generator. In this step the positions for clamping are generated. There- fore, positions alongside the beams are calculated within a given distance. The dimensions of the steam brake is also calculated in this step. Since the steam brake is considered to be cut orthogonally only, and to be at least as broad as the element, this step can be reduced to calculating the length according to the elements contours surrounding rectangle plus some extra overhang. The fourth part of the MES is called Nesting and enables the user to produce multiple elements to be processed on a single carrier. Elements are placed next to each other within certain constraints, which include dimensional restrictions, maximum number of mount parts per carrier or the minimum distance between elements. The latter is important to prevent an overlapping of the steam brake. After the elements are nested on carriers the whole production process can be observed and planned in the production unit list. This list shows the current state of the production unit and it is also possible to view or print the plans of these production units, showing all the details of the elements contours according to their position on the carrier. Similar to this plans the carrier can be augmented by further information from a laser system. The last unit of the MES, before the product is handed over to the production, is the NC Data Export. When the cell controller requests a new production unit, the MES prepares the next production unit in the production unit list to be produced. Throughout the whole manufacturing process, the produc- tion unit can be tracked and its current status can be ob- served. Further, it is possible to analyze production, failures and throughput through a reporting service provided. B. Cloud Exchange Service The Cloud Exchange Service (CES) offers the opportunity for several companies to exchange different CAD modules, 29