2. The analysis results for the strain of the material caused by the ironing in each process showed that the maximum strain was about 3.82, which was within the allowable strain limit for the material; this confirmed the material could be used without any problem.
3. It was verified that the area where the maximum load was applied and the maximum force of the load differed from process to process.
It was also verified that the applied force could differ depending on the shape of the mold and the shape of the material.
The results obtained in the present study can be used as the parameters for mold design in multi-stage deep drawing, which is used for manufacturing large and deep battery cases.