Toshiba [85] corporation is using a Processability Evaluation Method which works in tandem with assemblability evaluation method. The cost of any part depends on the processing method and alternate processing methods are examined to calculate the rating. The cost is determined by using a combination of different processes and materials.
Nnaji et al. [86] reported development of a complete product modeler for concurrent engineering. This modeling system builds product model with assembly, dimensioning and functionality consideration. It follows a set of part-to-part relations defined for assembly operations based on standard spatial relationships. The modeler also does manufacturability analysis for sheet-metal work and assembly. These analyses are based on production rules and collision relations, those do not include consideration of functionality.
El-Gizawy et al. [87] presented a system which considers suitability of different manufacturing processes for a given part. It does so based on a process capability database. Once a process is chosen two types of analysis is performed. First a rule based analysis using knowledge and rule base is done, at this stage redesign suggestions are also provided. These suggestions are not for complete parts, but for portions of the design. Finally a process simulation is performed both analytically and experimentally. It determines the time required to produce the part and material requirements. The methodology also includes in its cost calculation the machining cost after a net shape process.
Shah and Rogers [88] presents two different domains of manufacturability evaluation. The first one involves machining [89]. Alternative machining operations are evaluated first and suitable ones chosen. At this stage setup or sequencing issues are not considered. After that two types of checks are done. Rule based checking is done to find if there is any good practice violation. Then the cheapest possible feasible sequence of processes are found using branch and bound technique. Based on this process redesign suggestions are also presented. The result is in terms of machining cost. The second system involves forming methods of fiber-reinforced thermoplastics. It is a rule based system which considers both the part manufacturing and the tooling. It suggests redesigns in terms of parameters of the design features.