PPT: Forming | Manufacturing Engineering - Mechanical Engineering PDF Download

 Page 1


Unit III
Metal forming process
Page 2


Unit III
Metal forming process
Three Basic Bulk Deformation 
Processes
1. Rolling – slab or plate is squeezed between 
opposing rolls
2. Forging – work is squeezed and shaped 
between opposing dies
3. Extrusion – work is squeezed through a die 
opening, thereby taking the shape of the 
opening
Page 3


Unit III
Metal forming process
Three Basic Bulk Deformation 
Processes
1. Rolling – slab or plate is squeezed between 
opposing rolls
2. Forging – work is squeezed and shaped 
between opposing dies
3. Extrusion – work is squeezed through a die 
opening, thereby taking the shape of the 
opening
Deformation process in which work 
thickness is reduced by compressive 
forces exerted by two opposing rolls  
The rolling process (specifically, flat rolling).
Rolling
Page 4


Unit III
Metal forming process
Three Basic Bulk Deformation 
Processes
1. Rolling – slab or plate is squeezed between 
opposing rolls
2. Forging – work is squeezed and shaped 
between opposing dies
3. Extrusion – work is squeezed through a die 
opening, thereby taking the shape of the 
opening
Deformation process in which work 
thickness is reduced by compressive 
forces exerted by two opposing rolls  
The rolling process (specifically, flat rolling).
Rolling
The Rolls 
Rotating rolls perform two main functions:
? Pull the work into the gap between them by
friction between workpart and rolls
? Simultaneously squeeze the work to reduce its
cross section
Page 5


Unit III
Metal forming process
Three Basic Bulk Deformation 
Processes
1. Rolling – slab or plate is squeezed between 
opposing rolls
2. Forging – work is squeezed and shaped 
between opposing dies
3. Extrusion – work is squeezed through a die 
opening, thereby taking the shape of the 
opening
Deformation process in which work 
thickness is reduced by compressive 
forces exerted by two opposing rolls  
The rolling process (specifically, flat rolling).
Rolling
The Rolls 
Rotating rolls perform two main functions:
? Pull the work into the gap between them by
friction between workpart and rolls
? Simultaneously squeeze the work to reduce its
cross section
Types of Rolling
? Based on workpiece geometry :
? Flat rolling - used to reduce thickness of a
rectangular cross section
? Shape rolling - square cross section is formed into a
shape such as an I-beam
? Based on work temperature :
? Hot Rolling – most common due to the large amount
of deformation required
? Cold rolling – produces finished sheet and plate
stock