GATE PI
Metal Forming
Sheet Metal Forming Processes
Previous Years Questions

## Marks 1

The ratio of press force required to punch a square hole of $$30$$ $$mm$$ side in a $$1$$ $$mm$$ thick aluminium sheet to that needed to punch a squar...
Circular blanks of $$10mm$$ diameter are punched from an aluminium sheet of $$2$$ $$mm$$ thickness. The shear strength of aluminium is $$80$$ $$MPa.$$...
Match the following metal forming processes with their associated stresses in the Work-piece ...
Which one is not a method of reducing cutting forces to prevent the overloading of press
A cup of $$10$$ $$cm$$ height and $$5$$ $$cm$$ diameter is to be made from a sheet metal of $$2mm$$ thickness. The number of deductions necessary will...
For $$50\%$$ penetration of work material, a punch with single shear equal to thickness will
In a bending operation, If the modulus of elasticity $$E$$ is increased keeping all other parameters unchanged, the spring back will
In blanking operation, the best way to improve the smoothness and squarness of the edges is to
The function of draw bead in the deep drawing operation is to
In producing a punched hole of $$20mm$$ diameter, the dimension of the punch is ........ given the radial die clearance of $$0.1mm.$$
Wall thickness of drawn cup is controlled by
In progressive die (for sheet metal), spring loaded stripper plate is used to clamps the stock until:
In .................. A ................. operation the diameter of the desired hole will be smaller than the diameter of the .................... B...
A cup of $$10$$ $$cm$$ height and $$5$$ $$cm$$ diameter is to be made from a sheet metal of $$2mm$$ thickness. The number of deductions necessary will...

## Marks 2

Calculate the punch size in $$mm,$$ for a circular blanking operation for which details are given below. Size of the blank $$25$$ $$mm$$ Thickness of ...
A disc of $$200$$ $$mm$$ diameter is blanked from a strip of an aluminium alloy of thickness $$3.2$$ $$mm.$$ The material shear strength to fracture i...
Match the following ...
A blank of $$50$$ $$mm$$ diameter is to be sheared from a sheet of $$2.5$$ $$mm$$ thickness. The required radial clearance between the die and the pun...
Circular blanks of $$35$$ $$mm$$ diameter are punched from a steel sheet of $$2$$ $$mm$$ thickness. If the clearance per side between the punch and d...
It is required to punch a hole of diameter $$10mm$$ on a sheet of thickness $$3mm.$$ The shear strength of the work material is $$420Mpa.$$ The requir...
A work piece of $$1000$$ $$mm$$ length and $$300$$ $$mm$$ width is machined by planning operation with a feed of $$0.3$$ $$mm/stroke.$$ The machine t...
A gear with $$84$$ teeth is to be machined using a milling process with indexing. The index plate has the following four hole circles: $$36,38, 42., 4... Match the items in Group -$${\rm I}$$and$${\rm I}{\rm I}$$... In a surface broaching process, a broach having$$5mm$$pitch and cut per teeth$$0.05mm$$is used for reducing the thickness by$$6mm.$$If the lengt... It is required to punch a hole of diameter$$10mm$$on a sheet of thickness$$3mm.$$The shear strength of the work material is$$420MPa.$$The requir... A cup is to be drawn to a diameter of$$70mm$$with$$35mm$$depth from a$$0.5mm$$thick sheet metal. The cup is drawn in one operation. Assume$${\...
A cup is to be drawn to a diameter of $$70mm$$ with $$35mm$$ depth from a $$0.5mm$$ thick sheet metal. The cup is drawn in one operation. Assume $${\... A$$\phi \,\,25mm$$hole is pierced in a$$t=2.5mm$$thick steel sheet having shear strength$$\tau = 350\,\,MPa.$$If the diametral clearance i... A cylindrical cup of$$48.5mm$$diameter and$$52mm$$height has a corner radius of$$1.5mm$$Cold rolled steel sheet of thickness$$1....
A hole of $$40$$ $$mm$$ diameter is pierced in a steel sheet of $$4$$ $$mm$$ thickness without shear on the tool. Shear strength of steel is $$400$$ \$...
Determine the load required to punch a $$20$$ $$mm$$ diameter hole in $$2$$ $$mm$$ thick sheet. The properties of the material of the sheet are: Tensi...
In deep drawing of sheet metal, spring loaded stripper clamps the work until:
Consider the following statements related piercing and blanking $$1.$$ Shear on the punch reduces the maximum cutting force $$2.$$ Shear increases the...
A hydraulic press is used to produce circular blanks of $$10$$ $$mm$$ diameter from a sheet of $$2$$ $$mm$$ thickness. If the shear strength of the sh...
In sheet metal working, the spring back increase when $$P:$$ Ratio of bend radius to sheet thickness is small $$Q:$$ Young's modulus of the sheet is ...
In metal forming operation, the true strain in the $$X$$-direction is $$0.3$$ and in the $$Y$$-direction is $$-0.1.$$ The true strain in the $$Z$$-dir...
A hemispherical cup of radius $$'R'$$ is formed in a press working operation. The radius of blank would be
Calculate the smallest punch diameter that can be designed for piercing sheet metal strip with the following data. Crushing strength of the punch mate...
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