Workspace synthesis for flexible fixturing of stampings

Fixtures are used to position and hold parts for a series of assembly opera tions. In automotive body assembly, these fixtures conventionally have been dedicated, therefore they must be replaced whenever there are model change s in an auto body assembly plant. In recent years, however, the automotive industry has been changing from high volume to small-to-medium volume produ ction per model with an increasing number of models because customer tastes are diversifying. To cope with this change, auto companies need to be capa ble of producing a variety of models in small-to-medium volume, and they re ly on flexible assembly lines and flexible fixtures. These flexible fixture s use robots as programmable fixture elements so that they can be reprogram med for different stamped sheet metal parts. When designing flexible fixtur es, fixture designers need to be concerned with fixture workspaces for a se t of different stampings. However, existing fixture design methods address the fixturing of one stamping only. This paper presents a system that fixtu re designers can use to synthesize flexible fixture workspaces for a set of different stampings. Based on circular workspaces for flexible fixture rob ots, this system finds optimal workspace sizes and centers on a fixture bas e plate with a graphical display for visual checking. This system is simple to use and produces results quickly.