# Rebar Fabrication Plan to Enhance Production Efficiency for Simultaneous Multiple Projects
## 4 Modeling Simulation of the Rebar Production Plan
### A Simulation Model for Rebar Fabrication's Optimal Production Plans  
Figure 4 shows the models for SHD10 and SHD13 and the corresponding verification processes. There are seven components to the simulation of rebar plant processing: (1) raw steel import, (2) transportation, (3) priority and rebar type setting, (4) cutting, (5) rebar reuse, (6) bending, and (7) machine schedule setting. First, in the simulation model, a rebar with a particular diameter is put up as an agent to represent the raw steel imported into the rebar fabrication plant. Second, the rebar is transported and assigned to a cutter. It is believed that the hoist's maximum capacity can be gathered and transported all at once (for a hoist, the transport time typically varies with the transport distance). Third, different sites from which to collect various rebar types are taken into consideration before processing. Each agent is assigned a priority, which determines the order in which they move through the cutting process. By identifying various site-specific combinations in this step, the simulation can ultimately choose the optimum site-specific combination when prioritizing the agent. Fourth, the rebar is cut. Similar to \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Site** & **Diameter** & **Shape** & **N** & **Length** & **Quantity** & **Weight** \\ \hline \multirow{4}{*}{1} & 10 & — & 0 & 5.1 & 2538 & 7.249 \\  & 10 & — & 1 & 4.9 & 1392 & 3.820 \\  & 13 & — & 0 & 4.3 & 2166 & 9.267 \\  & 13 & — & 0 & 3.27 & 369 & 1.288 \\ \hline \multirow{4}{*}{2} & 10 & — & 2 & 1.06 & 1056 & 0.627 \\  & 10 & — & 4 & 1.33 & 456 & 0.340 \\  & 13 & — & 1 & 1.45 & 192 & 0.277 \\  & 13 & — & 0 & 1.04 & 654 & 0.677 \\ \hline \multirow{4}{*}{3} & 10 & — & 2 & 2.5 & 246 & 0.344 \\  & 10 & — & 4 & 2.02 & 258 & 0.292 \\  & 13 & — & 2 & 2.25 & 648 & 1.451 \\  & 13 & — & 2 & 2.12 & 345 & 0.728 \\ \hline \multirow{4}{*}{4} & 10 & — & 2 & 0.93 & 1941 & 1.011 \\  & 10 & — & 0 & 0.76 & 636 & 0.271 \\ \cline{1-1}  & 13 & — & 1 & 0.84 & 678 & 0.567 \\ \cline{1-1}  & 13 & — & 1 & 0.5 & 360 & 0.179 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Rebar types for each site. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Machine** & **Name** & **Utility** & **Capacity (ton)** \\ \hline \multirow{3}{*}{Machine for rebar transport} & \multicolumn{2}{c}{Raw steel assignment/Transportation} & 5 \\  & Hoist & \multicolumn{2}{c}{Cutter stowage} & 3 \\  & \multicolumn{2}{c}{Bender stowage} & 3 \\ \hline
**Machine** & **Model** & **Single Cut Rate (s)** & **\# of Simultaneous Cuts (SD500)** \\ \hline \multirow{3}{*}{Machine for rebar cutting} & HAAC-300B & 5 & D10: 27/D13: 21 \\  & HAAC-300H & 5 & D10: 27/D13: 21 \\  & TOYO-Japan TFC-M & 5 & D10: 18/D13: 13 \\ \hline \multirow{3}{*}{Rebar bending machine} & HAAB-25 & 10 & D10: 9/D13: 7 \\  & HAAB-10-6 & 10 & D10: 6/D13: 4 \\  & HAAB-10-7 & 10 & D10: 7/D13: 5 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Machine features. the case of hoists, for which the capacity is set considering simultaneous transportation, the number of simultaneous cuts is set for the cutters. The cutting machine is employed, and the required time is input to represent the number of times the imported rebar can be cut (with the maximum amount) and the time needed to perform one cut, which adds time to the process. The length of the raw steel and the needed length are taken into consideration while defining the cut steel bars, which are then repeatedly moved to the cutting process. Fifth, we considered the reuse of the cut rebar. The following factors determine the loss rate: the cutting procedure is repeated to reuse the rebar if the original steel is cut and the residual rebar is longer than the type of rebar to be processed, and vice versa. Sixth, the rebars go through bending procedures. The long-term steel without the need for bending is designed to finish the rebar process, and the rebar bending process takes as much time as the number of bends to the specific rebar type.