GATE ME 2021 Set 1 — Question 46
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Manufacturing Processes → Casting → Casting Types
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Question
A true centrifugal casting operation needs to be performed horizontally to make copper tube sections with outer diameter of 250 mm and inner diameter of 230 mm. The value of acceleration due to gravity, . If a -factor (ratio of centrifugal force to weight) of 60 is used for casting the tube, the rotational speed required is ______ rpm (round off to the nearest integer).
Correct answer
660 to 664
Solution
The -factor is defined as the ratio of centrifugal force to weight:
In centrifugal casting, the -factor is typically calculated based on the outer radius () to ensure proper compaction against the mold wall.
Given:
mm mm m
Convert angular velocity to rpm ():
Rounding to the nearest integer, we get 662 rpm.
In centrifugal casting, the -factor is typically calculated based on the outer radius () to ensure proper compaction against the mold wall.
Given:
mm mm m
Convert angular velocity to rpm ():
Rounding to the nearest integer, we get 662 rpm.
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