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A bolt head h...

Question

A bolt head has to be made at the end of a rod of diameter d = 12 mm by localized forging (upsetting) operation. The length of the unsupported portion of the rod is 40 mm. To avoid buckling of the rod, a closed forging operation has to be performed with a maximum die diameter of mm.

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Solution

If > 3d then

Die dia = 1.5d

= 1.5 (12)

= 18 mm

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