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Manufacturing and Assembly Technologies: Progressive Dies

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Manufacturing and Assembly Technologies: Progressive Dies

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Questions and Answers

What happens when the bending radius is smaller than the minimum bending radius?

The sheet undergoes a change in thickness

The sheet undergoes elastic deformation

The sheet fractures (correct)

The sheet only bends under plastic deformation

What is the typical Reduction of area (R) for Low carbon steels?

13-28 %

60-70 %

40-50 %

22-34 % (correct)

What is the condition for safe bending operations?

Rmin ≈ 0

Rmin < 0

Rmin > 0 (correct)

Rmin = 1

What happens when the bending radius is larger than the maximum bending radius?

The sheet undergoes elastic deformation Signup and view all the answers

What is the assumption made about the neutral axis in the bending process?

The neutral axis remains at the center Signup and view all the answers

What is the formula to calculate the deformation at the extrados?

Y = εt / 2R Signup and view all the answers

What is a characteristic of progressive dies?

They can couple blanking and bending operations. Signup and view all the answers

What is the primary advantage of high-speed steels over carbon and chromium steels?

They have better abrasion resistance. Signup and view all the answers

Which material is known for its high wear resistance and is often used for punching and blanking?

Tungsten carbide Signup and view all the answers

What is the typical application of carbon steels in stamping?

Stamping of aluminum alloys and mild steels. Signup and view all the answers

What is the significant benefit of using metal carbides in punching and blanking?

They have longer lifetimes than high-speed steels. Signup and view all the answers

What is the typical range of pieces that can be produced before resharpening is required for high-speed steels?

2,000 to 300,000 pieces. Signup and view all the answers

What is the formula for estimating the maximum cutting force in horizontal shear edge?

Fmax = τ t w Signup and view all the answers

What is the purpose of clearance in punching and blanking operations?

To design the proper punch and die sizes Signup and view all the answers

What is the difference between punching and blanking operations?

The purpose of the operation Signup and view all the answers

What is the relationship between the die opening and the punch size in punching and blanking operations?

The die opening is always larger than the punch size Signup and view all the answers

What is the approximated value of shear strength in terms of tensile strength?

τ ≈ 4/5 UTS Signup and view all the answers

What is the area under the force-penetration curve in a punching operation?

The cutting work Signup and view all the answers