Forming Flashcards

1
Q

What’s the difference between forging hammers and forging press?

A

Hammers: force applied by falling weight
Press: slow-speed compression (mechanical and hydraulic)

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2
Q

Types of forging

A

a. open die: pre-forming step performed between flat dies for final forging
b. closed die: work-piece deformed between two halves of mold of final shape

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3
Q

What does the pressure applied on the workpiece depend on?

A

a. roll radius R
b. coefficient of friction μ
c. reduction in thickness Lo-L
d. flow strength of metal σflow

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4
Q

What factors of rolling geometry can we control?

A

roll diameter, flow strength, coefficient of friction

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5
Q

As Pavg/σo increases, what happens to μ and a/h?

A

μ increases; a/h increases

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6
Q

What happens at the neutral point?

A

velocity of sheet = velocity of rolls

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7
Q

The volume rate of metal flow is ______

A

constant; voho = vh = vfhf

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8
Q

As σo ↑, R (or Lp) ↑, μ ↑, the average pressure for rolling _____

A

increases

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