Cutting, blanking and punching stresses produce unloading forces in stamping presses, referred to as snapthrough or reverse tonnage. Because thicker and higher-strength materials require increased cutting clearance and greater force to shear as compared to mild steel, both will generate proportionally increased unloading forces. Understanding the magnitude of these forces during the die-design process allows engineers to properly assign presses and incorporate countermeasures into the die design.
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