The relationship of burr height and blanking force with clearance in the blanking process of AA5754 aluminium alloy

Abstract

The effect of clearance and sheet thickness in the AA5754 sheet material blanking process on the burr formation and blanking force was examined experimentally. Measurements of the burr height and blanking force were performed in a modular die with six different clearance values (8%, 10%, 12%, 14%, 16% and 18%) by applying the blanking process to the AA5754 sheet metal of 1 mm and 2 mm in thickness. The influence rate of parameters affecting the burr height, the blanking force, and the mathematical relationship between them were identified by using the analysis of variance (ANOVA) and the regression analysis. Thus, it was determined that the burr formation increased with increased clearance and that the blanking force was not affected in the same proportion. In addition, it was found that the sheet thickness and clearance affected the burr formation at rates of 23.24% and 76.15%, respectively; on the other hand, the sheet thickness and clearance affected the blanking force at rates of 99.72% and 0.24%, respectively.