Designing of Punch and Die Dimensions

Q.

What is the perimeter of a cylinder?

Q. A metal disc of $20$ mm diameter is to be punched from a sheet of $2$ mm thickness. The punch and the dia clearance is $3$%. The required punch diameter is

1. $19.88$ mm
2. $19.94$ mm
3. $20.06$ mm
4. $20.12$ mm

Q. A metal disk of 30 mm diameter is to be punched from a sheet of 5 mm thickness. If the punch and die clearance is 4%, then the required diameter of punch is

1. 29.60 mm
2. 30.40 mm
3. 30.20 mm
4. 29.80 mm

Q. Circular blanks of $35mm$ dia are punched from a steel sheet of $2mm$ thickness, If the clearance per side between the punch and die is to be kept as $40$ microns. The size of punch and die should respectively be

1. $35$ and $835.040$
2. $34.92$ and $35$
3. $35$ and $35.080$
4. $35.040$ and $34.92$

Q. A sheet metal with a stock hardness of $250$ HRC has to be sheared using a punch and a die having a clearance of $1$ mm between them. If the stock hardness of the sheet metal increases to $400$ HRC, the clearance between the punch and the die should be (in mm)_____.

1. 1.265

Q. A blank of $50mm$ diameter is to be sheared from a sheet of $2.5mm$ thickness. The required radial clearance between the die and the punch is $6\%$ of sheet thickness. The punch and die diameter $\left(mm\right)$ for this blanking operation respectively are

1. $50.00\text{and}50.30$
2. $50.00\text{and}50.315$
3. $49.70\text{and}50.00$
4. $49.85\text{and}50.00$

Q. A $50$ mm diameter disc is to be punched out from a carbon steel sheet $1.0$ mm thick. The diameter of the die should be (Take clearance as $3$% of sheet thickness)

1. $49.925$ mm
2. $50.00$ mm
3. $5.075$ mm
4. none of these

Q. A 30 mm diameter hole is pierced in a t = 3 mm thick steel sheet having shear strength, $\tau =400MPa$. If the diametral clearance is given by the expression, what is the die diameter____

1. 30.271 mm
2. 30 mm
3. 30.542 mm
4. 29.729 mm

Q. A 30 mm diameter hole is pierced in a t = 3 mm thick steel sheet having shear strength, $\tau =400MPa$. If the diametral clearance is given by the expression, what is the die diameter____

1. 30.271 mm
2. 30 mm
3. 30.542 mm
4. 29.729 mm

Q. A cylindrical cup of $48.5mm$ diameter and $52mm$ height has a corner radius of $1.5mm$. Cold rolled steel sheet of thickness $1.5mm$ is used to produce the cup. Assume trim allowance as $2mm$ per $25mm$ of cup diameter. What is the blank size in $mm$?

1. $102.0$
2. $115.4$
3. $120.5$
4. $128.5$

Q. Calculate the punch size in mm, for a circular blanking operation for which details
Size of blank $25$ mm
Thickness of the sheet $2$ mm
Radial clearance between
Punch and die $0.06$ mm
Die allowance $0.05$ mm

1. $24.83$
2. $24.89$
3. $25.01$
4. $25.17$