FORMING

This is a primary shaping operation i.e. attaining the required form of a job by pressing, forging, rollong, spinning, extrusion, piercing, blanking, punching, drawing, squeezing, bending, coining, sizing etc,
Kindling refer sheet metal processes in MP COURSE MATERIAL on blog or site.
MECHANICAL WORKING OF METALS:
It is shaping of metals(plastic deformation) by means of external force.
Mechanical working may be either hot or cold working.
Hot Working: The working of metals above the recrystalline temperature but below the burning point.Some metals such as lead and tin have low recrystalline range so can be worked at room temp, but most of the metals have high recrystalline temp.
Write advantages and disadvantages.
Various hot workinh processes are: Hot rolling, hot forging, hot spinning, hot extrusion, hot drawing or cupping hot piercing etc.
Kindly go through these hot working processes-explained on site.
Cold Working: The working of metal below the recrystalline temp and deformation is achieved by slip of planes.Force required is more as compared to hot working.
NB: During cold working strength and hardness of metal increases, but stresses are set, which is annealed,if to be further worked to remove the hardness and residual stresses.
Write some advantages and disadvantages.
Cold working processes are- Sheet metal work, shearing, drawing squeezing, bending cold heading, rotary swaging, coining, sizing, spinning, extrusion, cold drawing, bending, streach forming, hobbing, embossing, staking, ironing, peening,etc.