Module 7 Sheet Metal Forming Lecture 1

Topics: Shear stress, Shear strength, Steel, Force / Pages: 10 (2280 words) / Published: Nov 27th, 2014
NPTEL - Mechanical Engineering - Forming

Sheet metal operations - Cutting and related processes

R. Chandramouli
Associate Dean-Research
SASTRA University, Thanjavur-613 401
Joint Initiative of IITs and IISc – Funded by MHRD

Page 1 of 9

NPTEL - Mechanical Engineering - Forming

Table of Contents

1.Cutting and related processes: .............................................. 3
1.1 Introduction: .......................................................................................................................... 3

1.2 Shearing, blanking, punching: ......................................................................................... 4
1.2.1 Shearing: ......................................................................................................................... 4
1.2.2 Shearing zone geometry: .......................................................................................... 5

1.4 Cutting:..................................................................................................................................... 7
1.4 Fine blanking: ........................................................................................................................ 8
1.5 Shearing and forming tools:............................................................................................. 8

Joint Initiative of IITs and IISc – Funded by MHRD

Page 2 of 9

NPTEL - Mechanical Engineering - Forming

1.Cutting and related processes:
1.1 Introduction:
Sheet metal forming, also called stamping, involves operations such as cutting, drawing, spinning etc on sheets. Sheet metal forming involves predominantly tensile forces, compared to bulk forming, which involve compressive forces. Due to tensile stress, sheets may undergo localized deformation followed by cracking.
Sheets are rolled products, which have thickness less than 6mm. Sheet metal operations involve work pieces with large surface area to thickness ratio. Blanks are cut from sheets. These

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