Hot Spinning
Hot spinning is a process in which pressure and plastic flow is used to shape material. Spinning may be either hot or cold and is generally carried over a spinning…
Hot Drawing
Drawing is pulling of metal through a die or a set of dies for achieving a reduction in a diameter. The material to be drawn is reduced in diameter. Fig.…
Hot Extrusion
It is the process of enclosing the heated billet or slug of metal in a closed cavity and then pushing it to flow from only one die opening so that…
Hot Piercing or Seamless tubing
Hot piercing is also known as seamless tubing or roll piercing process. The process setup is shown in Fig. 15.3. It is used for making thinwalled round objects. Seamless tube…
Classification Of Hot Working Processes
The classification of hot working processes is given as under. 1. Hot rolling 2. Hot forging 3. Hot extrusion 4. Hot drawing 5. Hot spinning 6. Hot piercing or seamless…
HOT WORKING
Mechanical working processes which are done above recrystallisation temperature of the metal are know as hot working processes. Some metals, such as lead and tin, have a low recrystallisation temperature…
RECRYSTALISATION
During the process of plastic deformation in metal forming, the plastic flow of the metal takes place and the shapes of the grains are changed. If the plastic deformation is…
METAL FORMING
Metal forming is also known as mechanical working of metals. Metal forming operations are frequently desirable either to produce a new shape or to improve the properties of the metal.…
Objectives of Heat Treatment
The major objectives of heat treatment are given as under 1. It relieves internal stresses induced during hot or cold working. 2. It changes or refines grain size. 3. It…
Significance of Transformations Lines
Line ABCD The line ABCD tells that above this line melting has been completed during heating the iron. The molten metal is purely in the liquidus form. Below this line…
