Papers by Author: Stephen van Duin

Abstract: In order to achieve higher productivity and flexibility, manufacturing industry is turning increasingly to robotics based lean automation systems. This lean approach presents a series of new challenges for the control, operation and programming of robotic hardware implemented to carry out a range of manufacturing processes. This paper reviews relevant path planning methodologies alongside a specific set of requirements for a manipulator operating in a lean automation workcell. Then, new challenges to path planning for a lean automation system are presented. Finally, a framework for a new path planner is developed and its performance is compared to existing methods.

Abstract: In this paper we developed a novel and cost effective automated system for use in the Australian shipbuilding industry. We began by investigating current shipbuilding processes and determining the most feasible area where automation could be further developed. Then we designed an automation concept with the objective of developing a highly flexible system. A prototype of the integrated tool was developed for preliminary testing in a simulated industry assembly process, the results of which were benchmarked against a manually fabricated assembly. The outcomes from the benchmarking showed the feasibility of such a system and allowed us to determine the future direction for further development of the integrated tool.

Abstract: The feasibility of using Tandem Gas Metal Arc Welding (T-GMAW) to produce full penetration butt welds in 5mm ship panel steel plates has been assessed and compared to the current Submerged Arc Welding (SAW) process. Experiments conducted show that the T-GMAW process is feasible and demonstrated a significant improvement over the SAW process in several areas including higher travel speed, a reduction in filler material, significantly lower post weld distortion, and a smaller Heat Affected Zone (HAZ), while maintaining similar microstructure and mechanical properties in the weld metal and HAZ.