Page 43 - MetalForming-Jan-2018-issue

Providing bend relief (Fig. 4) near the bends in the workpiece will avoid tearing at the edge of the material and also provide clearance to ease any downstream operations. In addition, providing a sufficient bend radius (Fig. 5) near the bends will ensure that the workpiece material does not undergo stress beyond its maximum limits and
will not fail prematurely. Providing accurate bend-radius calculation also helps in reducing stress concentration near the bend.
Lastly, collars (Fig. 6) provide extra stiffness to the sheetmetal at flanges, especially near pierced areas. Collars will balance shear stress caused by the piercing operation. MF
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