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A Study of Optimal Mould Geometric Parameters During the Cold Preforming of Hollow Fasteners with a Thin Flange

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Academic year: 2021

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Fig. 1. The folding phenomenon after flange forming (Chang et al. [8])
Fig. 2. Velocity field during initial flange forming stage (Chang et al. [8])
Fig. 5 illustrates the mould geometric shape, which must be controlled in order to study the folding or  reaming, including the semi-angle of the punch (α), the semi-angle of the die (β), and the protrudent length of the  punch pin (L)
Table 1    Design parameters and levels for flange preforming
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