Rework is not an option.
During the production of automotive stamped parts, issues such as punched hole dimensions being too large or too small-or deviating significantly from the punch dimensions-may arise. To address these problems, the editor suggests that, in addition to considering factors like the design dimensions, machining precision, and blanking clearance of the forming punches and dies, one should also evaluate the following aspects:
Burrs generated during the blanking process can cause dimensional issues; therefore, it is necessary to regrind the cutting edges and verify that the blanking clearance is appropriate. Instability during bending-particularly with U-shaped and V-shaped bends-is another common cause; key solutions include implementing proper guiding before and during the bending process, as well as applying sufficient hold-down pressure to prevent the part from slipping during bending.
During the production of EV stamped parts, increased tensile stress on the material raises the likelihood of the part tipping or twisting. Tipping causes the punched hole size to decrease. Conversely, applying high pressure induces plastic deformation in the material, causing the hole size to increase; reducing this pressure causes the hole size to decrease.