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I know that the mechanical power press constructors give:

1) the diagram of permitted work depending on used number

of slide single stroke per minute;

2) the diagram of eccentric loads on the slide (ellipsis graph).

But I don't know how they can do these ones.

For question 1. I presume that the iter calculation is:

- energy for forming: E0=rated Force x rated distance to BDC

- energy for deformation press: E1=F^2/2xRigidity press

- energy losses: E2= ...? (x% of E0 ?)

Total energy: Et=E0+E1+E2 this is the energy in continous operation

(permitted work on automatic strokes).

Now, for the press flywheel, assuming a slowdown of 20% during

continous stroking, the energy stored in the flywheel is:

Ev=Et/(1-0.8^2)

So the inertial moment of flywheel is: J=Ev/iω^2

where i: grade of non-uniformity, ω: average speed flywheel in rad/s

Now the questions are:

a) first of all: how can I calculate the drive motor power (kW) ?

b) above all: how can I calculate permitted work on single strokes ??

(I've read somewhere the energy in single strokes is about twice-2- of continous operation: why? I don't think 2 is a magic number...)

2) In the end how can I drawing diagram of eccentric loads ?

I really thank everyone help me.

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# Mechanical press - energy of flywheel

Can you offer guidance or do you also need help?

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