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Question

A punching press punches 30 holes per min in a plate requiring 12 kJ of energy per hole during each cycle. Actual punching takes 30% of the cycle time. A flywheel connected to the machine electric motor. The flywheel rotates at a mean speed of 240 rpm and the fluctuation of speed is not to exceed ± 2 percent of the mean speed.

The power of the electric motor required is

A
3 kW
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B
6 k W
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C
12 kW
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D
15 kW
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Solution

The correct option is B 6 k W
n = 30 hole/min = 2 sec/hole.

E = 12 kJ/hole, cycle time = 2 sec

P= 12 kJ/2 sec = 6 kW

Cs=0.04;N=240 rpm,ω=240×2π60=8π

Power of motor required = 6 kW


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