Abstract:
The elastic springback effect fiom a wiping die process for forming of a hard disk drive component
was studied using both experiments and the finite element method (FEM). Four grades of stainless
steel sheet (AISI 304-S189, AISI 304-D189, AISI 304-DDQ189 and AISI 316L-LM1811), each
having a thickness of 0.5 millimeter, were used in this research. The fonning was done using a two
step bending process. The first step bent the workpiece in a 90 celsices die set. The second step rebent the
workpiece using a cam plunger die to compensate for the springback. The results of the FEM
simulations of the forming process revealed that die design 82' had the least amount of springback.
Next, FEM simulations were conducted in which the orientation of the workpiece was either 0celsices, 45celsices,
or 90 celsices to the sheet rolling direction. The stainless steel sheet gradeAIS1 304-S189 showed
springback values of -0.57celsices, -0.51celsices, and -0.15celsices, with respect to the Ocelsices, 45celsicesor
90 celsices orientation to therolling direction, respectively. Grade AISI 304-Dl89 showed the springback
values of -0.82 celsices,-0.44 celsices, and -0.52 celsices. Grade AISI 304-DDQ189 showed springback
values of -0.71celsices, -0.32 celsices, and -0.47celsices.Finally, grade AISI 316L-LM1811 showed springback of -0.54 celsices , -0.38 celsices , and -0.34 celsices . The FEMsimulation results showed good agreement with the experimental results, with an error of
approximately 1 %.