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drawing force in deep drawing process

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I'm mechanical engineering student, and I'm working on project and one of the questions I've got is to plan a deep drawing process of a box and basically the demand is that I have to use a formula of drawing force of a cup and develop it to suit a rectangle shape and I have zero clue how to do it hope you guys will be able to help me out.

This is the formula I need to use

𝐹𝑚𝑎𝑥 = 𝜋*𝑑𝑝*𝑇*𝜎𝑢𝑡𝑠 [( 𝑑0/𝑑𝑝 ) − 0.7]

Thank you


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