GATE ME 2020 Set 2 — Question 32
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Manufacturing Processes → Forming → Forging (Types & Load)
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Question
A bolt head has to be made at the end of a rod of diameter mm by localized forging (upsetting) operation. The length of the unsupported portion of the rod is mm. To avoid buckling of the rod, a closed forging operation has to be performed with a maximum die diameter of ______ mm.
Correct answer
18 to 19.5
Solution
In upsetting, there are three rules to avoid buckling:
1.The length of the unsupported portion of the rod should not exceed 3 times the diameter ().
2.If , a closed die must be used, and the diameter of the die cavity should not exceed 1.5 times the rod diameter ().
3.If and the die cavity diameter is more than 1.5 times the rod diameter, the length of the unsupported portion outside the die should not exceed the rod diameter.
Given mm and mm. Since , rule 2 applies. The maximum die diameter mm.Continue learning with Success Tracker
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