Page 35 - Module DMV20173
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3.0 SHEET METAL PROCESSES
2. Fig. 3.6 (a) Punching (piercing) and blanking, while (b) shows the examples of
various die-cutting operations on sheet metal.
Figure 3.6 (a) Punching and blanking. (b) Various die-cutting.
a. Die Cutting
1. This is a shearing operation that consists of the following basic processes:
a. Perforating: punching a number of holes in a sheet
b. Parting: shearing the sheet into two or more pieces
c. Notching: removing pieces (or various shapes) from the edges
d. Lancing: leaving a tab without removing any material
b. Fine blanking
1. Very smooth and square edges can be produced by fine blanking.
2. Fig. 3.7 (a) shows the comparison of sheared edges produced by conventional (left)
and by fine-blanking (right) techniques and (b) shows schematic illustration of one
setup for fine blanking.
BPLK 67 DMV 20173
