Proceedings of the 34th International MATADOR Conference, 2004
Traditionally strip layout is a manual, experience-based activity. Automation of strip layout is ... more Traditionally strip layout is a manual, experience-based activity. Automation of strip layout is desirable to improve productivity and the quality of design, and to provide computer-aided tools for design. One important, but very difficult, task in automated strip layout design is the determination of a good sequence of stamping operations so that the part can be stamped correctly and efficiently. This paper presents our work to develop a novel, graph-theoretic, operations sequencing method that is capable of generating a stamping sequence automatically, taking into account practical stamping constraints. A graph is used to represent a stamping part and define the relationships between its stamping features. These stamping features are then clustered into workstation sets using a graph colouring algorithm. Next, the sets are ordered to determine an optimal sequence of workstations. The objective function for the optimisation is ‘minimisation of the torque difference between two sides of the progressive die’. The proposed approach can speed up the progressive die design process by automating the strip layout design.
Three-dimensionally (3D) printed Ti–6Al–4V (Ti64) samples via an electron beam melting (EBM) proc... more Three-dimensionally (3D) printed Ti–6Al–4V (Ti64) samples via an electron beam melting (EBM) process were developed to investigate their microstructure and mechanical and tribological properties in comparison with those of commercial Ti64 samples. The 3D-printed Ti64 samples had a heavily twinned and acicular martensitic structure that was responsible for their higher surface hardness than that of the commercial Ti64 samples. The 3D-printed Ti64 samples tested against a 100Cr6 steel counter ball without and with Hank's solution had a higher wear resistance associated with their higher surface hardness than the commercial Ti64 samples. The use of Hank's solution during sliding reduced the wear of the both Ti64 samples as a result of the lubricating effect of the solution. It could be concluded that the 3D-printed Ti64 samples in this study had comparable mechanical and tribological properties to those of the commercial Ti64 samples.
Proceedings of the 34th International MATADOR Conference, 2004
Traditionally strip layout is a manual, experience-based activity. Automation of strip layout is ... more Traditionally strip layout is a manual, experience-based activity. Automation of strip layout is desirable to improve productivity and the quality of design, and to provide computer-aided tools for design. One important, but very difficult, task in automated strip layout design is the determination of a good sequence of stamping operations so that the part can be stamped correctly and efficiently. This paper presents our work to develop a novel, graph-theoretic, operations sequencing method that is capable of generating a stamping sequence automatically, taking into account practical stamping constraints. A graph is used to represent a stamping part and define the relationships between its stamping features. These stamping features are then clustered into workstation sets using a graph colouring algorithm. Next, the sets are ordered to determine an optimal sequence of workstations. The objective function for the optimisation is ‘minimisation of the torque difference between two sides of the progressive die’. The proposed approach can speed up the progressive die design process by automating the strip layout design.
Three-dimensionally (3D) printed Ti–6Al–4V (Ti64) samples via an electron beam melting (EBM) proc... more Three-dimensionally (3D) printed Ti–6Al–4V (Ti64) samples via an electron beam melting (EBM) process were developed to investigate their microstructure and mechanical and tribological properties in comparison with those of commercial Ti64 samples. The 3D-printed Ti64 samples had a heavily twinned and acicular martensitic structure that was responsible for their higher surface hardness than that of the commercial Ti64 samples. The 3D-printed Ti64 samples tested against a 100Cr6 steel counter ball without and with Hank's solution had a higher wear resistance associated with their higher surface hardness than the commercial Ti64 samples. The use of Hank's solution during sliding reduced the wear of the both Ti64 samples as a result of the lubricating effect of the solution. It could be concluded that the 3D-printed Ti64 samples in this study had comparable mechanical and tribological properties to those of the commercial Ti64 samples.
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