A new approach for concurrent product and process design of mechanical parts is presented in this paper. This approach enables designers to ensure that the product will be manufactured with the existing manufacturing facility at high quality and lowest cost. It is composed of an integrated expert and CAD (computer aided design) system that meets the requirements for accomplishing the concept of design for manufacturability or concurrent engineering. The system is based mainly on three tasks: firstly, developing a technique for automated feature recognition from the database of a solid modeller; secondly, interfacing the expert system tool-kit with the solid modelling system; finally, building an expert system that contains extensive information about both manufacturing facilities and product features. The expert system provides feedback about manufacturing concerns such as process limits or design inconsistencies. This work is part of the present extended research plan for developing a generic system suitable for various manufacturing practices based on design for manufacturability strategy.
This paper presents a chamferless vertical/horizontal remote centre compliance (CVHRCC) mechanism developed for robotic peg-in-hole assembly operations. The wrist adopts the passive accommodation approach and differs from other devices in its category in its ability to accommodate positional errors between the mating parts without a chamfer on either part. In addition, the wrist is designed to work from both the vertical and the horizontal directions. A series of experiments have been carried out for testing the new wrist. The main conclusion of the assembly experiments is that the CVHRCC can work effectively from the vertical direction in accommodating positional errors between chamferless mating parts with large clearance (over 0.2 mm) between the peg and hole.
The peg-in-hole insertion process is the most common task in the robotic/automatic assembly industry. However, the inaccuracy of the assembly robot in positioning the inserted peg into the hole due to the uncertainty of the assembly environment, represents an obstacle in this area of automation. To overcome this problem, complex and expensive equipment has been designed. The objective of this paper is to provide an in-depth understanding of the chamferless peg-hole assembly, by showing the geometrical, dynamical conditions for a successful assembly operation. Also, the results of this analysis have been simulated to demonstrate the chamferless peg-hole insertion process.
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