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Factory and enterprise systems

ing the correct way to insert the component. A visualization of a single workstation can be seen in Figure 2. Aiding the worker eases the load on the worker’s memory, as it eliminates obsolete tasks such as choosing and remembering. The proposed assembly cell aims to shorten the ramp-up times of new products, add flexibility to the use of the work-force by enhancing worker training and improving quality.

Discussion and conclusions Part of the findings from the study are that current technologies allow implementation of ubiquitous assembly environments but that there are two key requirements for the data modelling and management systems that still prevent the real applications on the factory floor. These requirements for enabling ubiquitous assembly cells in practice are: • interoperating data models (ontologies) for integrating product data and production data

•

singular lever item management, required for sensing and identifying discrete events from the assembly process.

These two requirements need to be tackled in order to create a fluent data flow from the process planning to the factory floor and to supply decision-making with higher resolution real time data instead of estimates. The research also studied preliminary solutions to fulfil these two requirements. These solutions include collection and usage of discrete events data from the assembly process, ranging from simple device outputs to the use of specific positioning and locating systems and RTLS. These collected data, which in themselves are rather meaningless, are combined with a digital representation of the factory resources, work plans and instructions enabling the identification of the exact real time state of all the items related to the assembly process, which, in turn, forms the basis for applications of ubiquitous assembly cells.

Periodically ordered components

RFID Antenna

Wagon for component kits

Display PC with WLAN

Kanban components

UWB Tag

Wagon for hand tool kits RFID reader

PC

Figure 2. Single assembly station.

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VTT Research Highlights 3  

Production matters. VTT in global trends. Kai Häkkinen (ed.)

VTT Research Highlights 3  

Production matters. VTT in global trends. Kai Häkkinen (ed.)