A validated FEM model to improve metal blanking

摘要

Blanking is still commonly used in high volume production. Yet, since high-tech products are becoming smaller and smaller, product specifications are becoming more severe. The fact that the blanking process is not yet fully understood and that the process is based on empirical knowledge, leads to trial and error. Therefore, industry needs a suitable model to help overcome the long cycle time in developing a particular blanking process. We developed a Finite Element model and validated it using a planner experimental set-up. We not only measured the punch load, but also the logarithmic strain-fields. Using Digital Image Correlation, we measured the displacement fields, coupled with a second order method to calculate strain-fields. For both small and large clearances, we concluded that the numerical model describes the blanking process well, up to ductile fracture initiation. This validated model will be good starting point from which to tackle the issue of ductile fracture in future research.