Processing of 3D sheet metal components in STEP AP-203 format. Part II: feature reasoning system

Abstract

Both feature recognition and reasoning are needed for automating manufacturing planning activities for 3D sheet metal components. The feature reasoning system proposed here generates manufacturing information (e.g. flat pattern, locations of various features, internal cuts and blank profiles, type of tools required, operation sequence, bending sequence, etc.) for the features recognized in Part I of this paper. The issues related to flat pattern developments as experienced while using commercial software have been addressed in this work. A tool selection approach that uses standard tools for single and multiple blow features in punch presses is suggested. A zigzag method for operation sequencing and a virtual bend sequencing system are included. The system has been tested with various components and the results are compatible with industrial practices.

Keywords:

• sheet metal
• neutral format
• feature reasoning
• flat pattern
• tool selection
• operation sequencing

Acknowledgement

We thank Mr S. Chandrasekhar, Manager (Operations), Numeric Power Systems, Chennai, for useful discussions on tool selection and actual problems faced in the industry during production.