Designing of Punch and Die Dimensions
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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
- 19.88 mm
- 19.94 mm
- 20.06 mm
- 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
- 29.60 mm
- 30.40 mm
- 30.20 mm
- 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
- 35 and 835.040
- 34.92 and 35
- 35 and 35.080
- 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)_____.
- 1.265
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 (mm) for this blanking operation respectively are
- 50.00and50.30
- 50.00and50.315
- 49.70and50.00
- 49.85and50.00
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)
- 49.925 mm
- 50.00 mm
- 5.075 mm
- none of these
Q. A 30 mm diameter hole is pierced in a t = 3 mm thick steel sheet having shear strength, τ=400 MPa. If the diametral clearance is given by the expression, what is the die diameter____
- 30.271 mm
- 30 mm
- 30.542 mm
- 29.729 mm
Q. A 30 mm diameter hole is pierced in a t = 3 mm thick steel sheet having shear strength, τ=400 MPa. If the diametral clearance is given by the expression, what is the die diameter____
- 30.271 mm
- 30 mm
- 30.542 mm
- 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?
- 102.0
- 115.4
- 120.5
- 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
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
- 24.83
- 24.89
- 25.01
- 25.17