Materials Science and Manufacturing Engineering Miscellaneous Easy Questions and Answers | Page - 9

Materials Science and Manufacturing Engineering Miscellaneous

For blanking and piercing operations, clearance is provided on the..... and the.... respectively.

1. Punch & Die
1. Punch
1. Die
1. None of the above

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Punch & Die

Correct Option: A

Punch & Die

The blank diameter used in thread rolling will be

1. Equal to the major diameter of the thread
1. Equal to the pitch diameter of the thread
1. Little higher than the minor diameter of the thread
1. Little higher than the pitch diameter of the thread

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NA

Correct Option: D

NA

The blank diameter used in thread rolling will be

1. Equal to the major diameter of the thread
1. Equal to the pitch diameter of the thread
1. Little higher than the minor diameter of the thread
1. Little higher than the pitch diameter of the thread

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NA

Correct Option: D

NA

A rectangular hole of size 100 mm × 50 mm is to be made on a 5 mm thick sheet of steel having ultimate tensile strength and shear strength of 500 MPa and 300 MPa, respectively. The hole is made by punching process. Neglecting the effect of clearance, the punching force (in kN) is

1. 300
1. 450
1. 600
1. 750

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Perimeter = (50 + 100) × 2 = 300 , Thickness = 5
so shown Area = 300 × 5 = 1500 mm².
Punching force = τ × A_s = 300 × 1500 = 450 KN

Correct Option: B

Perimeter = (50 + 100) × 2 = 300 , Thickness = 5
so shown Area = 300 × 5 = 1500 mm².
Punching force = τ × A_s = 300 × 1500 = 450 KN

The cold forming process in which a hardened tool is pressed against a workpiece (when there is r elative mot ion bet ween t he tool and the workpiece) to produce a roughened surface with a regular pattern is

1. Roll forming
1. Knurling
1. Chamfering
1. Stip rolling

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Knurling : It is a process of impressing a diamond shaped or straight line pattern on the surface by a workpiece by using specially shaped hardened metal wheels to improve its appearance and to provide a better gripping surface.

Correct Option: B

Knurling : It is a process of impressing a diamond shaped or straight line pattern on the surface by a workpiece by using specially shaped hardened metal wheels to improve its appearance and to provide a better gripping surface.