C. Gaudillière - N. Ranc - A. Larue - A. Maillard - P. Lorong - Septembre 2013 - EXPERIMENTAL MECHANICS – Vol. 53 – N° 7…
Blanking is a shearing process which is commonly used in the metal forming industry [1 –3 ]. Using this process, large and very large production runs of thin parts can be manufactured from sheet metal stock. Currently, two main blanking technologies exist: traditional blanking and fine blanking. In traditional blanking the sheet metal is located on the die and the punch blanks it to obtain the desired workpiece geometry.
The punch speed and the clearances between the punch and the die are about 0.1 ms−1 and 10 % of the metal sheet thickness. In the fine blanking process the metal sheet is compressed between the die and a guide plate. An upper and a lower punch extract the workpiece. In this technique, the punch speed and the clearances between punch and die are lower: about 0.01 ms−1 for the punch speed and 1 % for the clearances. The main advantages of fine blanking are the tight tolerances and also the elimination of finishing machining operations. However, the tool costs are higher than the conventional blanking technique.
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André Maillard
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