A study of process planning for metal cutting
Licentiatavhandling, 2009
Process planning as a function for competitiveness is often neglected. However, as an
intermediary between product development and manufacturing, it holds a key function in
transforming product specifications and requirements into a producible process plan.
Demands and requirements should be met concurrently as manufacturing costs and lead times
are minimised. The focus of this thesis is the act of process planning, where the use of better
methodologies, computer-aids and performance measurements are essential parts. Since
process planning has the function of transforming demands and requirements, changing
customer and regulative requirements are vital to regard. Since environmentally benign
products and production increases in importance, the research presented in this thesis includes
a CNC machining cost model, which relates machining costs to energy consumption. The
presented results in this thesis are based on quantitative and qualitative studies in the metal
working industry.
This thesis has contributed to an enhanced understanding of process planning to achieve better
performance and important areas for improvements. Despite a 50 year history of computerised
process planning aids, few of these are used in the industry, where manual process planning
activities are more common. Process planning aids should be developed around the process
planner so that non-value adding activities, such as information management and
documentation are minimised in order to allow more resources for value adding activities,
such as decision making. This thesis presents a study of systematic process planning in
relation to perceived efficiency. This correlation could however not be verified, which opens
up for further studies of other possible explanations for process planning efficiency. Process
planning improvements in the industry are difficult to make, since there is little focus on
process planning activities and limited knowledge about actual performance hereof. This
means that measures taken regarding process planning development are difficult to verify.
green manufacturing
CAPP
CAM
performance
efficiency
Process planning