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The paper describes some advances in the use of grid analysis and forming limit diagram techniques. It is shown that a limited amount of process or tooling related information can be derived from the measurements of the grid distortion at localized areas. It is illustrated that a full three dimensional grid analysis of the part is required for a comprehensive understanding of the interrelation between the state of deformation at different regions and the possible improvement in process.

The paper describes a system currently under development, intended to be the spine for organizing an open-ended knowledge-based system for stampings within the sheet metal industry. The system is designed for those not necessarily expert in plasticity and strain theory, as well as applications where lead time is of prime importance. The objectives of the system are to develop: i a common vocabulary for BASIC SHAPES and DEFORMATION MODES ii an open-ended filing system for the organization of the knowledge i.e. the documentation of solutions and procedures used, as well as assessing historical data iii a procedure for deriving the FIRST FORM SHAPE and the number of forming stages and iv a system for the assessment of forming severity, force and energy calculations, material selection, tribological requirements and process planning.