FEA Of Stress And Deflection In Fine Blanking Punch

Fine Blanking is a promising advanced manufacturing technology, with advantages such as high-quality, high efficiency, low lost, it is widely used in various industrial fields. But the fine blanking in high-pressure environments can make high-quality parts, and it needs the mold which can bear high-stress. Analysis of punch stress, deformation and the impact on product quality from deformation, can help us fully take the advantage of its technical and economic advantages, and it also has some significance and reference value in the actual production.The finite element method can accurately get the the stress and strain information of mold or workpiece at each stage. Through the information, you can not only predict occurrence and development of crack, but also can quantificationally present the influence of technical parameters on the life of the die and the forming quality. It can acquire valuable reference data about the process parameters and mold structure.In this paper, a rigid plastic and a elastic-plastic finite element model was established respectively with DEFORM-2D software, and then the process of fine blanking of the AISI-1045 billet (thickness= 4mm) were simulated. The deformation, stress and strain distribution of the billet and punch were analyzed by simulation. The peak of stress or strain in the billet appeared near the corner area of the die.The material of the area prone to tearing. The stress peak of the punch appeared in the edge area, which is the most severe stress concentration area. It's easy to deformation, chipping and failure in this area. Deformation of the punch will affect the forming quality.The elastic-plastic model was built in order to analysis the effect of the parameters on the punch and the quality of formed parts, including punch material, clearance and corner radius. We can find that the punch material which has a large elastic modulus can reduce the deformation of the punch and improve the quality of formed parts. On the other hand, little clearance can improve the forming quality, but reduced the mold life. The corner of the die plays an important role in improving the life of the die and the forming quality. Two models were compared with experiment in the end. The results showed that the simulation results were basically consistent with the experimental results. It demonstrated that the numerical simulation is an effective tool to solve and analysis problem, can provide significant data for actual production.